Updated on 2025/10/08

写真a

 
YAMASHITA Masaki
 
Organization
Institute for Space-Earth Environmental Research Division for Cosmic Ray Research Professor
Graduate School
Graduate School of Science
Title
Professor

Degree 3

  1. 博士(理学) ( 2003.7   早稲田大学 ) 

  2. 修士(理学) ( 2000.3   早稲田大学 ) 

  3. 学士(工学) ( 1998.3   早稲田大学 ) 

Research Interests 1

  1. Dark Matter

Research Areas 1

  1. Natural Science / Particle, nuclear, cosmic-ray, and astrophysics - experiment  / Dark Matter, neutrino, astroparticle

Research History 10

  1. Nagoya University   Institute for Space-Earth Environmental Research Division for Cosmic Ray Research   Professor

    2025.10

  2. The University of Tokyo   Institute for the Physics and Mathematics of the Universe   Designated Associate Professor

    2021.4 - 2025.9

  3. The University of Tokyo   Designated Associate Professor

    2021.4 - 2025.9

  4. Nagoya University   Designated Associate Professor

    2020.4 - 2021.3

  5. The University of Tokyo   Kamioka observatory, ICRR   Project Associate Professor

    2008.1 - 2020.3

  6. The University of Tokyo   Designated Associate Professor

    2008.1 - 2020.3

  7. Columbia University   Physics Department and Astrophysics Laboratory   Research Scientist

    2007.7 - 2007.12

  8. Columbia University   Physics Department and Astrophysics Laboratory   Research Scientist

    2007.7 - 2007.12

  9. Columbia University   Physics Department and Astrophysics Laboratory   Associate Research Scientist

    2005.8 - 2007.6

  10. Columbia University   Physics Department and Astrophysics Laboratory   Post-docs

    2003.7 - 2005.7

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Education 2

  1. Waseda University   Graduate School of Science and Engineering

    2000.4 - 2003.7

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    Country: Japan

  2. Waseda University   Graduate School of Science and Engineering

    1998.4 - 2000.3

Professional Memberships 1

  1. THE PHYSICAL SOCIETY OF JAPAN

 

Papers 112

  1. Evaluation of radon adsorption efficiency values in xenon with activated carbon fibers

    Nakano Y., Ichimura K., Ito H., Okada T., Sekiya H., Takeuchi Y., Tasaka S., Yamashita M.

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS   Vol. 2020 ( 11 )   2020.11

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    Publishing type:Research paper (scientific journal)   Publisher:Progress of Theoretical and Experimental Physics  

    DOI: 10.1093/ptep/ptaa119

    Web of Science

    Scopus

  2. Direct dark matter search with xmass

    Yamashita M.

    Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013   Vol. 2013-October   2013

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    Publishing type:Research paper (scientific journal)   Publisher:Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013  

    Scopus

  3. First Result from the XENON10 Dark Matter Experiment

    YAMASHITA Masaki

    Butsuri   Vol. 63 ( 12 ) page: 953 - 956   2008.12

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    Publishing type:Research paper (scientific journal)   Publisher:The Physical Society of Japan (JPS)  

    In April 2007, the first result from XENON10 group was announced at the annual meeting of the American Physics Society. The double-phase Xenon detector was used for the direct dark matter search experiment. For a WIMP mass of 30 (100) GeV/c^2, the upper limit is 4.5(8.8)×10^<-44>cm^2, a factor of 2.3 lower than the previously best published. In this article, the performance of XENON10 detector is described in detail.

    CiNii Research

  4. The neutron veto of the XENONnT experiment: results with demineralized water International coauthorship International journal Open Access

    Aprile, E; Aalbers, J; Abe, K; Maouloud, SA; Althueser, L; Andrieu, B; Angelino, E; Martin, DA; Arneodo, F; Baudis, L; Bazyk, M; Bellagamba, L; Biondi, R; Bismark, A; Boese, K; Brown, A; Bruno, G; Budnik, R; Cai, C; Capelli, C; Cardoso, JMR; Chavez, APC; Colijn, AP; Conrad, J; Cuenca-García, JJ; D'Andrea, V; Garcia, LCD; Decowski, MP; Deisting, A; Di Donato, C; Di Gangi, P; Diglio, S; Eitel, K; el Morabit, S; Elykov, A; Ferella, AD; Ferrari, C; Fischer, H; Flehmke, T; Flierman, M; Fulgione, W; Fuselli, C; Gaemers, P; Gaior, R; Galloway, M; Gao, F; Ghosh, S; Giacomobono, R; Glade-Beucke, R; Grandi, L; Grigat, J; Guan, H; Guida, M; Gyorgy, P; Hammann, R; Higuera, A; Hils, C; Hoetzsch, L; Hood, NF; Iacovacci, M; Itow, Y; Jakob, J; Joerg, F; Kaminaga, Y; Kara, M; Kavrigin, P; Kazama, S; Kobayashi, M; Koke, D; Kopec, A; Landsman, H; Lang, RF; Levinson, L; Li, I; Li, S; Liang, S; Lin, YT; Lindemann, S; Lindner, M; Liu, K; Liu, M; Loizeau, J; Lombardi, F; Long, J; Lopes, JAM; Luce, T; Ma, Y; Macolino, C; Mahlstedt, J; Mancuso, A; Manenti, L; Marignetti, F; Undagoitia, TM; Martens, K; Masbou, J; Masson, E; Mastroianni, S; Melchiorre, A; Merz, J; Messina, M; Michael, A; Miuchi, K; Molinario, A; Moriyama, S; Morå, K; Mosbacher, Y; Murra, M; Müller, J; Ni, K; Oberlack, U; Paetsch, B; Pan, Y; Pellegrini, Q; Peres, R; Peters, C; Pienaar, J; Pierre, M; Plante, G; Pollmann, TR; Principe, L; Qi, J; Qin, J; García, DR; Rajado, M; Singh, R; Sanchez, L; dos Santos, JMF; Sarnoff, I; Sartorelli, G; Schreiner, J; Schulte, P; Eissing, HS; Schumann, M; Lavina, LS; Selvi, M; Semeria, F; Shagin, P; Shi, S; Shi, J; Silva, M; Simgen, H; Szyszka, C; Takeda, A; Takeuchi, Y; Tan, PL; Thers, D; Toschi, F; Trinchero, G; Tunnell, CD; Tönnies, F; Valerius, K; Vecchi, S; Vetter, S; Solar, FIV; Volta, G; Weinheimer, C; Weiss, M; Wenz, D; Wittweg, C; Wu, VHS; Xing, Y; Xu, D; Xu, Z; Yamashita, M; Yang, L; Ye, J; Yuan, L; Zavattini, G; Zhong, M

    EUROPEAN PHYSICAL JOURNAL C   Vol. 85 ( 6 )   2025.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:European Physical Journal C  

    Radiogenic neutrons emitted by detector materials are one of the most challenging backgrounds for the direct search of dark matter in the form of weakly interacting massive particles (WIMPs). To mitigate this background, the XENONnT experiment is equipped with a novel gadolinium-doped water Cherenkov detector, which encloses the xenon dual-phase time projection chamber (TPC). The neutron veto (NV) can tag neutrons via their capture on gadolinium or hydrogen, which release γ-rays that are subsequently detected as Cherenkov light. In this work, we present the first results of the XENONnT NV when operated with demineralized water only, before the insertion of gadolinium. Its efficiency for detecting neutrons is (82±1)%, the highest neutron detection efficiency achieved in a water Cherenkov detector. This enables a high efficiency of (53±3)% for the tagging of WIMP-like neutron signals, inside a tagging time window of 250μs between TPC and NV, leading to a livetime loss of 1.6% during the first science run of XENONnT.

    DOI: 10.1140/epjc/s10052-025-14105-0

    Open Access

    Web of Science

    Scopus

  5. XENONnT WIMP search: Signal and background modeling and statistical inference International coauthorship International journal

    Aprile, E; Aalbers, J; Abe, K; Maouloud, SA; Althueser, L; Andrieu, B; Angelino, E; Martin, DA; Arneodo, F; Baudis, L; Bazyk, M; Bellagamba, L; Biondi, R; Bismark, A; Boese, K; Brown, A; Bruno, G; Budnik, R; Cardoso, JMR; Chávez, APC; Colijn, AP; Conrad, J; Cuenca-García, JJ; D'Andrea, V; Garcia, LCD; Decowski, MP; Di Donato, C; Di Gangi, P; Diglio, S; Eitel, K; Elykov, A; Ferella, AD; Ferrari, C; Fischer, H; Flehmke, T; Flierman, M; Fulgione, W; Fuselli, C; Gaemers, P; Gaior, R; Galloway, M; Gao, F; Ghosh, S; Giacomobono, R; Glade-Beucke, R; Grandi, L; Grigat, J; Guan, H; Guida, M; Gyorgy, P; Hammann, R; Higuera, A; Hils, C; Hoetzsch, L; Hood, NF; Iacovacci, M; Itow, Y; Jakob, J; Joerg, F; Kaminaga, Y; Kara, M; Kavrigin, P; Kazama, S; Kobayashi, M; Kopec, A; Kuger, F; Landsman, H; Lang, RF; Levinson, L; Li, I; Li, S; Liang, S; Lin, YT; Lindemann, S; Lindner, M; Liu, K; Loizeau, J; Lombardi, F; Long, J; Lopes, JAM; Luce, T; Ma, Y; Macolino, C; Mahlstedt, J; Mancuso, A; Manenti, L; Marignetti, F; Undagoitia, TM; Martens, K; Masbou, J; Masson, E; Mastroianni, S; Melchiorre, A; Messina, M; Michael, A; Miuchi, K; Molinario, A; Moriyama, S; Morå, K; Mosbacher, Y; Murra, M; Müller, J; Ni, K; Oberlack, U; Paetsch, B; Pan, Y; Pellegrini, Q; Peres, R; Peters, C; Pienaar, J; Pierre, M; Plante, G; Pollmann, TR; Principe, L; Qi, J; Qin, J; García, DR; Rajado, M; Singh, R; Sanchez, L; dos Santos, JMF; Sarnoff, I; Sartorelli, G; Schreiner, J; Schulte, D; Schulte, P; Eissing, HS; Schumann, M; Lavina, LS; Selvi, M; Semeria, F; Shagin, P; Shi, S; Shi, J; Silva, M; Simgen, H; Takeda, A; Tan, PL; Terliuk, A; Thers, D; Toschi, F; Trinchero, G; Tunnell, CD; Tönnies, F; Valerius, K; Vecchi, S; Vetter, S; Solar, FIV; Volta, G; Weinheimer, C; Weiss, M; Wenz, D; Wittweg, C; Wu, VHS; Xing, Y; Xu, D; Xu, Z; Yamashita, M; Yang, L; Ye, J; Yuan, L; Zavattini, G; Zhong, M

    PHYSICAL REVIEW D   Vol. 111 ( 10 )   2025.5

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Physical Review D  

    The XENONnT experiment searches for weakly interacting massive particle (WIMP) dark matter scattering off a xenon nucleus. In particular, XENONnT uses a dual-phase time projection chamber with a 5.9-ton liquid xenon target, detecting both scintillation and ionization signals to reconstruct the energy, position, and type of recoil. A blind search for nuclear recoil WIMPs with an exposure of 1.1 ton-years (4.18 t fiducial mass) yielded no signal excess over background expectations, from which competitive exclusion limits were derived on WIMP-nucleon elastic scatter cross sections, for WIMP masses ranging from 6 GeV/c2 up to the TeV/c2 scale. This work details the modeling and statistical methods employed in this search. By means of calibration data, we model the detector response, which is then used to derive background and signal models. The construction and validation of these models is discussed, alongside additional purely data-driven backgrounds. We also describe the statistical inference framework, including the definition of the likelihood function and the construction of confidence intervals.

    DOI: 10.1103/PhysRevD.111.103040

    Web of Science

    Scopus

  6. Neutrinoless double beta decay sensitivity of the XLZD rare event observatory Reviewed International coauthorship International journal Open Access

    Aalbers, J; Abe, K; Adrover, M; Maouloud, SA; Akerib, DS; Al Musalhi, AK; Alder, F; Althueser, L; Amaral, DWP; Amarasinghe, CS; Ames, A; Andrieu, B; Angelides, N; Angelino, E; Antunovic, B; Aprile, E; Araújo, HM; Armstrong, JE; Arthurs, M; Babicz, M; Baker, A; Balzer, M; Bang, J; Barberio, E; Bargemann, JW; Barillier, E; Basharina-Freshville, A; Baudis, L; Bauer, D; Bazyk, M; Beattie, K; Beaupere, N; Bell, NF; Bellagamba, L; Benson, T; Bhatti, A; Biesiadzinski, TP; Biondi, R; Biondi, Y; Birch, HJ; Bishop, E; Bismark, A; Boehm, C; Boese, K; Bolotnikov, A; Brás, P; Braun, R; Breskin, A; Brew, CAJ; Brommer, S; Brown, A; Bruni, G; Budnik, R; Burdin, S; Cai, C; Capelli, C; Carini, G; Carmona-Benitez, MC; Carter, M; Chauvin, A; Chawla, A; Chen, H; Cherwinka, JJ; Chin, YT; Chott, NI; Chavez, APC; Clark, K; Colijn, AP; Colling, DJ; Conrad, J; Converse, MV; Coronel, R; Costanzo, D; Cottle, A; Cox, G; Cuenca-García, JJ; Curran, D; Cussans, D; D'Andrea, V; Daniel Garcia, LC; Darlington, I; Dave, S; David, A; Davies, GJ; Decowski, MP; Deisting, A; Delgaudio, J; Dey, S; Di Donato, C; Di Felice, L; Di Gangi, P; Diglio, S; Ding, C; Dobson, JEY; Doerenkamp, M; Drexlin, G; Druszkiewicz, E; Dunbar, CL; Eitel, K; Elykov, A; Engel, R; Eriksen, SR; Fayer, S; Fearon, NM; Ferella, AD; Ferrari, C; Fieldhouse, N; Fischer, H; Flaecher, H; Flehmke, T; Flierman, M; Fraser, ED; Fruth, TMA; Fujikawa, K; Fulgione, W; Fuselli, C; Gaemers, P; Gaior, R; Gaitskell, RJ; Gallice, N; Galloway, M; Gao, F; Garroum, N; Geffre, A; Genovesi, J; Ghag, C; Ghosh, S; Giacomobono, R; Gibbons, R; Girard, F; Glade-Beucke, R; Glück, F; Gokhale, S; Grandi, L; Green, J; Grigat, J; van der Grinten, MGD; Grössle, R; Guan, H; Guida, M; Gyorgy, P; Haiston, JJ; Hall, CR; Hall, T; Hammann, R; Hannen, V; Hansmann-Menzemer, S; Hargittai, N; Hartigan-O'Connor, E; Haselschwardt, SJ; Hernandez, M; Hertel, SA; Higuera, A; Hils, C; Hiraoka, K; Hoetzsch, L; Hoferichter, M; Homenides, GJ; Hood, NF; Horn, M; Huang, DQ; Hughes, S; Hunt, D; Iacovacci, M; Itow, Y; Jacquet, E; Jakob, J; James, RS; Joerg, F; Jones, S; Kaboth, AC; Kahlert, F; Kamaha, AC; Kaminaga, Y; Kara, M; Kavrigin, P; Kazama, S; Keller, M; Kemp-Russell, P; Khaitan, D; Kharbanda, P; Kilminster, B; Kim, J; Kirk, R; Kleifges, M; Klute, M; Kobayashi, M; Kodroff, D; Koke, D; Kopec, A; Korolkova, EV; Kraus, H; Kravitz, S; Kreczko, L; von Krosigk, B; Kudryavtsev, VA; Kuger, F; Kurita, N; Landsman, H; Lang, RF; Lawes, C; Lee, J; Lehnert, B; Leonard, DS; Lesko, KT; Levinson, L; Li, A; Li, I; Li, S; Liang, S; Liang, Z; Lin, J; Lin, YT; Lindemann, S; Linden, S; Lindner, M; Lindote, A; Lippincott, WH; Liu, K; Loizeau, J; Lombardi, F; Lopes, JAM; Lopes, MI; Lorenzon, W; Loutit, M; Lu, C; Lucchetti, GM; Luce, T; Luitz, S; Ma, Y; Macolino, C; Mahlstedt, J; Maier, B; Majewski, PA; Manalaysay, A; Mancuso, A; Manenti, L; Mannino, RL; Marignetti, F; Marley, T; Marrodán Undagoitia, T; Martens, K; Masbou, J; Masson, E; Mastroianni, S; Maupin, C; McCabe, C; McCarthy, ME; McKinsey, DN; Mclaughlin, JB; Melchiorre, A; Menéndez, J; Messina, M; Miller, EH; Milosovic, B; Milutinovic, S; Miuchi, K; Miyata, R; Mizrachi, E; Molinario, A; Monteiro, CMB; Monzani, ME; Morå, K; Moriyama, S; Morrison, E; Morteau, E; Mosbacher, Y; Mount, BJ; Müller, J; Murdy, M; Murphy, ASJ; Murra, M; Naylor, A; Nelson, HN; Neves, F; Newstead, JL; Nguyen, A; Ni, K; O'Hare, C; Oberlack, U; Obradovic, M; Olcina, I; Oliver-Mallory, KC; Orebi Gann, GD; Orpwood, J; Ouahada, S; Oyulmaz, K; Paetsch, B; Palladino, KJ; Palmer, J; Pan, Y; Pandurovic, M; Pannifer, NJ; Paramesvaran, S; Patton, SJ; Pellegrini, Q; Penning, B; Pereira, G; Peres, R; Perry, E; Pershing, T; Piastra, F; Pienaar, J; Piepke, A; Pierre, M; Plante, G; Pollmann, TR; Principe, L; Qi, J; Qiao, K; Qie, Y; Qin, J; Radeka, S; Radeka, V; Rajado, M; García, DR; Ravindran, A; Razeto, A; Reichenbacher, J; Rhyne, CA; Richards, A; Rischbieter, GRC; Riyat, HS; Rosero, R; Roy, A; Rushton, T; Rynders, D; Saakyan, R; Sanchez, L; Sanchez-Lucas, P; Santone, D; dos Santos, JMF; Sartorelli, G; Sazzad, ABMR; Scaffidi, A; Schnee, RW; Schreiner, J; Schulte, P; Schulze Eissing, H; Schumann, M; Schwenck, A; Schwenk, A; Lavina, LS; Selvi, M; Semeria, F; Shagin, P; Sharma, S; Shaw, S; Shen, W; Sherman, L; Shi, S; Shi, SY; Shimada, T; Shutt, T; Silk, JJ; Silva, C; Simgen, H; Sinev, G; Singh, R; Siniscalco, J; Solmaz, M; Solovov, VN; Song, Z; Sorensen, P; Soria, J; Stanley, O; Steidl, M; Stenhouse, T; Stevens, A; Stifter, K; Sumner, TJ; Takeda, A; Tan, PL; Taylor, DJ; Taylor, WC; Thers, D; Thümmler, T; Tiedt, DR; Tönnies, F; Tong, Z; Toschi, F; Tovey, DR; Tranter, J; Trask, M; Trinchero, G; Tripathi, M; Tronstad, DR; Trotta, R; Tunnell, CD; Urquijo, P; Usón, A; Utoyama, M; Vaitkus, AC; Valentino, O; Valerius, K; Vecchi, S; Velan, V; Vetter, S; de Viveiros, L; Volta, G; Vorkapic, D; Wang, A; Wang, JJ; Wang, Y; Waters, D; Weerman, KM; Weinheimer, C; Weiss, M; Wenz, D; Whitis, TJ; Wild, K; Williams, M; Wilson, M; Wilson, ST; Wittweg, C; Wolf, J; Wolfs, FLH; Woodford, S; Woodward, D; Worcester, M; Wright, CJ; Wu, VHS; Wüstling, S; Wurm, M; Xia, Q; Xing, Y; Xu, D; Xu, J; Xu, Y; Xu, Z; Yamashita, M; Yang, L; Ye, J; Yeh, M; Yu, B; Zavattini, G; Zha, W; Zhong, M; Zuber, K

    JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS   Vol. 52 ( 4 )   2025.4

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Journal of Physics G Nuclear and Particle Physics  

    The XLZD collaboration is developing a two-phase xenon time projection chamber with an active mass of 60-80 t capable of probing the remaining weakly interacting massive particle-nucleon interaction parameter space down to the so-called neutrino fog. In this work we show that, based on the performance of currently operating detectors using the same technology and a realistic reduction of radioactivity in detector materials, such an experiment will also be able to competitively search for neutrinoless double beta decay in <sup>136</sup>Xe using a natural-abundance xenon target. XLZD can reach a 3σ discovery potential half-life of 5.7 × 10<sup>27</sup> years (and a 90% CL exclusion of 1.3 × 10<sup>28</sup> years) with 10 years of data taking, corresponding to a Majorana mass range of 7.3-31.3 meV (4.8-20.5 meV). XLZD will thus exclude the inverted neutrino mass ordering parameter space and will start to probe the normal ordering region for most of the nuclear matrix elements commonly considered by the community.

    DOI: 10.1088/1361-6471/adb900

    Open Access

    Web of Science

    Scopus

  7. Search for Light Dark Matter in Low-Energy Ionization Signals from XENONnT International coauthorship International journal Open Access

    Aprile, E; Aalbers, J; Abe, K; Maouloud, SA; Althueser, L; Andrieu, B; Angelino, E; Martin, DA; Arneodo, F; Baudis, L; Bazyk, M; Bellagamba, L; Biondi, R; Bismark, A; Boese, K; Brown, A; Bruno, G; Budnik, R; Cai, C; Capelli, C; Cardoso, JMR; Chavez, APC; Colijn, AP; Conrad, J; Cuenca-García, JJ; D'Andrea, V; Garcia, LCD; Decowski, MP; Deisting, A; Di Donato, C; Di Gangi, P; Diglio, S; Eitel, K; el Morabit, S; Elykov, A; Ferella, AD; Ferrari, C; Fischer, H; Flehmke, T; Flierman, M; Fulgione, W; Fuselli, C; Gaemers, P; Gaior, R; Galloway, M; Gao, F; Ghosh, S; Giacomobono, R; Glade-Beucke, R; Grandi, L; Grigat, J; Guan, H; Guida, M; Gyorgy, P; Hammann, R; Higuera, A; Hils, C; Hoetzsch, L; Hood, NF; Iacovacci, M; Itow, Y; Jakob, J; Joerg, F; Kaminaga, Y; Kara, M; Kavrigin, P; Kazama, S; Kobayashi, M; Koke, D; Kopec, A; Landsman, H; Lang, RF; Levinson, L; Li, I; Li, S; Liang, S; Lin, YT; Lindemann, S; Lindner, M; Liu, K; Liu, M; Loizeau, J; Lombardi, F; Long, J; Lopes, JAM; Luce, T; Ma, Y; Macolino, C; Mahlstedt, J; Mancuso, A; Manenti, L; Marignetti, F; Undagoitia, TM; Martens, K; Masbou, J; Masson, E; Mastroianni, S; Melchiorre, A; Merz, J; Messina, M; Michael, A; Miuchi, K; Molinario, A; Moriyama, S; Mora, K; Mosbacher, Y; Murra, M; Müller, J; Ni, K; Oberlack, U; Paetsch, B; Pan, Y; Pellegrini, Q; Peres, R; Peters, C; Pienaar, J; Pierre, M; Plante, G; Pollmann, TR; Principe, L; Qi, J; Qin, J; García, DR; Rajado, M; Singh, R; Sanchez, L; dos Santos, JMF; Sarnoff, I; Sartorelli, G; Schreiner, J; Schulte, P; Eissing, HS; Schumann, M; Lavina, LS; Selvi, M; Semeria, F; Shagin, P; Shi, S; Shi, J; Silva, M; Simgen, H; Szyszka, C; Takeda, A; Tan, PL; Thers, D; Toschi, F; Trinchero, G; Tunnell, CD; Tönnies, F; Valerius, K; Vecchi, S; Vetter, S; Solar, FIV; Volta, G; Weinheimer, C; Weiss, M; Wenz, D; Wittweg, C; Wu, VHS; Xing, Y; Xu, D; Xu, Z; Yamashita, M; Yang, L; Ye, J; Yuan, L; Zavattini, G; Zhong, M

    PHYSICAL REVIEW LETTERS   Vol. 134 ( 16 ) page: 161004   2025.4

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Physical Review Letters  

    We report on a blinded search for dark matter with single- and few-electron signals in the first science run of XENONnT relying on a novel detector response framework that is physics model dependent. We derive 90% confidence upper limits for dark matter-electron interactions. Heavy and light mediator cases are considered for the standard halo model and dark matter up-scattered in the Sun. We set stringent new limits on dark matter-electron scattering via a heavy mediator with a mass within 10-20 MeV/c2 and electron absorption of axionlike particles and dark photons for mχ below 0.03 keV/c2.

    DOI: 10.1103/PhysRevLett.134.161004

    Open Access

    Web of Science

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    PubMed

  8. First Search for Light Dark Matter in the Neutrino Fog with XENONnT International coauthorship International journal Open Access

    Aprile, E; Aalbers, J; Abe, K; Maouloud, SA; Althueser, L; Andrieu, B; Angelino, E; Martin, DA; Arneodo, F; Baudis, L; Bazyk, M; Bellagamba, L; Biondi, R; Bismark, A; Boese, K; Brown, A; Bruno, G; Budnik, R; Cai, C; Capelli, C; Cardoso, JMR; Chávez, APC; Colijn, AP; Conrad, J; Cuenca-García, JJ; D'Andrea, V; Garcia, LCD; Decowski, MP; Deisting, A; Di Donato, C; Di Gangi, P; Diglio, S; Eitel, K; el Morabit, S; Elykov, A; Ferella, AD; Ferrari, C; Fischer, H; Flehmke, T; Flierman, M; Fulgione, W; Fuselli, C; Gaemers, P; Gaior, R; Galloway, M; Gao, F; Ghosh, S; Giacomobono, R; Glade-Beucke, R; Grandi, L; Grigat, J; Guan, H; Guida, M; Gyorgy, P; Hammann, R; Higuera, A; Hils, C; Hoetzsch, L; Hood, NF; Iacovacci, M; Itow, Y; Jakob, J; Joerg, F; Kaminaga, Y; Kara, M; Kavrigin, P; Kazama, S; Kobayashi, M; Koke, D; Kopec, A; Landsman, H; Lang, RF; Levinson, L; Li, I; Li, S; Liang, S; Lin, YT; Lindemann, S; Lindner, M; Liu, K; Liu, M; Loizeau, J; Lombardi, F; Long, J; Lopes, JAM; Luce, T; Ma, Y; Macolino, C; Mahlstedt, J; Mancuso, A; Manenti, L; Marignetti, F; Undagoitia, TM; Martens, K; Masbou, J; Masson, E; Mastroianni, S; Melchiorre, A; Merz, J; Messina, M; Michael, A; Miuchi, K; Molinario, A; Moriyama, S; Morå, K; Mosbacher, Y; Murra, M; Müller, J; Ni, K; Oberlack, U; Paetsch, B; Pan, Y; Pellegrini, Q; Peres, R; Peters, C; Pienaar, J; Pierre, M; Plante, G; Pollmann, TR; Principe, L; Qi, J; Qin, J; García, DR; Rajado, M; Singh, R; Sanchez, L; dos Santos, JMF; Sarnoff, I; Sartorelli, G; Schreiner, J; Schulte, P; Eissing, HS; Schumann, M; Lavina, LS; Selvi, M; Semeria, F; Shagin, P; Shi, S; Shi, J; Silva, M; Simgen, H; Szyszka, C; Takeda, A; Tan, PL; Thers, D; Toschi, F; Trinchero, G; Tunnell, CD; Tönnies, F; Valerius, K; Vecchi, S; Vetter, S; Solar, FIV; Volta, G; Weinheimer, C; Weiss, M; Wenz, D; Wittweg, C; Wu, VHS; Xing, Y; Xu, D; Xu, Z; Yamashita, M; Yang, L; Ye, J; Yuan, L; Zavattini, G; Zhong, M

    PHYSICAL REVIEW LETTERS   Vol. 134 ( 11 ) page: 111802   2025.3

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    We search for dark matter (DM) with a mass [3,12] GeV/c2 using an exposure of 3.51 tonne year with the XENONnT experiment. We consider spin-independent DM-nucleon interactions mediated by a heavy or light mediator, spin-dependent DM-neutron interactions, momentum-dependent DM scattering, and mirror DM. Using a lowered energy threshold compared to the previous weakly interacting massive particle search, a blind analysis of [0.5, 5.0] keV nuclear recoil events reveals no significant signal excess over the background. XENONnT excludes spin-independent DM-nucleon cross sections >2.5×10-45 cm2 at 90% confidence level for 6 GeV/c2 DM. In the considered mass range, the DM sensitivity approaches the "neutrino fog,"the limitation where neutrinos produce a signal that is indistinguishable from that of light DM-xenon nucleus scattering.

    DOI: 10.1103/PhysRevLett.134.111802

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  9. XENONnT analysis: Signal reconstruction, calibration, and event selection International coauthorship International journal Open Access

    Aprile E., Aalbers J., Abe K., Ahmed Maouloud S., Althueser L., Andrieu B., Angelino E., Angevaare J.R., Antón Martin D., Arneodo F., Baudis L., Bazyk M., Bellagamba L., Biondi R., Bismark A., Boese K., Brown A., Bruno G., Budnik R., Cardoso J.M.R., Cimental Chávez A.P., Colijn A.P., Conrad J., Cuenca-García J.J., D'Andrea V., Daniel Garcia L.C., Decowski M.P., Deisting A., Di Donato C., Di Gangi P., Diglio S., Eitel K., Elykov A., Ferella A.D., Ferrari C., Fischer H., Flehmke T., Flierman M., Fulgione W., Fuselli C., Gaemers P., Gaior R., Galloway M., Gao F., Ghosh S., Giacomobono R., Glade-Beucke R., Grandi L., Grigat J., Guan H., Guida M., Gyorgy P., Hammann R., Higuera A., Hils C., Hoetzsch L., Hood N.F., Iacovacci M., Itow Y., Jakob J., Joerg F., Kaminaga Y., Kara M., Kavrigin P., Kazama S., Kobayashi M., Koke D., Kopec A., Kuger F., Landsman H., Lang R.F., Levinson L., Li I., Li S., Liang S., Lin Y.T., Lindemann S., Lindner M., Liu K., Loizeau J., Lombardi F., Long J., Lopes J.A.M., Luce T., Ma Y., Macolino C., Mahlstedt J., Mancuso A., Manenti L., Marignetti F., Marrodán Undagoitia T., Martens K., Masbou J., Masson E., Mastroianni S., Melchiorre A., Merz J., Messina M., Michael A., Miuchi K.

    Physical Review D   Vol. 111 ( 6 )   2025.3

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    The XENONnT experiment, located at the INFN Laboratori Nazionali del Gran Sasso, Italy, features a 5.9 tonne liquid xenon time projection chamber surrounded by an instrumented neutron veto, all of which is housed within a muon veto water tank. Because of extensive shielding and advanced purification to mitigate natural radioactivity, an exceptionally low background level of (15.8±1.3) events/(tonne·year·keV) in the (1,30) keV region is reached in the inner part of the time projection chamber. XENONnT is, thus, sensitive to a wide range of rare phenomena related to dark matter and neutrino interactions, both within and beyond the Standard Model of particle physics, with a focus on the direct detection of dark matter in the form of weakly interacting massive particles. From May 2021 to December 2021, XENONnT accumulated data in rare-event search mode with a total exposure of one tonne·year. This paper provides a detailed description of the signal reconstruction methods, event selection procedure, and detector response calibration, as well as an overview of the detector performance in this time frame. This work establishes the foundational framework for the "blind analysis"methodology we are using when reporting XENONnT physics results.

    DOI: 10.1103/PhysRevD.111.062006

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  10. Luminescence-quenching model for nuclear recoils in rare-gas liquids for direct dark matter searches International coauthorship International journal

    Akira Hitachi, Kiseki Nakamura, Masaki Yamashita

    Physical Review D     2025.2

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    DOI: 10.1103/PhysRevD.111.043003

  11. First Indication of Solar <SUP>8</SUP>B Neutrinos via Coherent Elastic Neutrino-Nucleus Scattering with XENONnT International coauthorship International journal Open Access

    Aprile, E; Aalbers, J; Abe, K; Maouloud, SA; Althueser, L; Andrieu, B; Angelino, E; Martin, DA; Arneodo, F; Baudis, L; Bazyk, M; Bellagamba, L; Biondi, R; Bismark, A; Boese, K; Brown, A; Bruno, G; Budnik, R; Cai, C; Capelli, C; Cardoso, JMR; Chávez, APC; Colijn, AP; Conrad, J; Cuenca-García, JJ; D'Andrea, V; Garcia, LCD; Decowski, MP; Deisting, A; Di Donato, C; Di Gangi, P; Diglio, S; Eitel, K; Elykov, A; Ferella, AD; Ferrari, C; Fischer, H; Flehmke, T; Flierman, M; Fulgione, W; Fuselli, C; Gaemers, P; Gaior, R; Galloway, M; Gao, F; Ghosh, S; Giacomobono, R; Glade-Beucke, R; Grandi, L; Grigat, J; Guan, H; Guida, M; Gyorgy, P; Hammann, R; Higuera, A; Hils, C; Hoetzsch, L; Hood, NF; Iacovacci, M; Itow, Y; Jakob, J; Joerg, F; Kaminaga, Y; Kara, M; Kavrigin, P; Kazama, S; Kobayashi, M; Koke, D; Kopec, A; Kuger, F; Landsman, H; Lang, RF; Levinson, L; Li, I; Li, S; Liang, S; Lin, YT; Lindemann, S; Lindner, M; Liu, K; Liu, M; Loizeau, J; Lombardi, F; Long, J; Lopes, JAM; Luce, T; Ma, Y; Macolino, C; Mahlstedt, J; Mancuso, A; Manenti, L; Marignetti, F; Undagoitia, TM; Martens, K; Masbou, J; Masson, E; Mastroianni, S; Melchiorre, A; Merz, J; Messina, M; Michael, A; Miuchi, K; Molinario, A; Moriyama, S; Morå, K; Mosbacher, Y; Murra, M; Müller, J; Ni, K; Oberlack, U; Paetsch, B; Pan, Y; Pellegrini, Q; Peres, R; Peters, C; Pienaar, J; Pierre, M; Plante, G; Pollmann, TR; Principe, L; Qi, J; Qin, J; García, DR; Rajado, M; Singh, R; Sanchez, L; dos Santos, JMF; Sarnoff, I; Sartorelli, G; Schreiner, J; Schulte, P; Eissing, HS; Schumann, M; Lavina, LS; Selvi, M; Semeria, F; Shagin, P; Shi, S; Shi, J; Silva, M; Simgen, H; Takeda, A; Tan, PL; Thers, D; Toschi, F; Trinchero, G; Tunnell, CD; Tönnies, F; Valerius, K; Vecchi, S; Vetter, S; Solar, FIV; Volta, G; Weinheimer, C; Weiss, M; Wenz, D; Wittweg, C; Wu, VHS; Xing, Y; Xu, D; Xu, Z; Yamashita, M; Yang, L; Ye, J; Yuan, L; Zavattini, G; Zhong, M

    PHYSICAL REVIEW LETTERS   Vol. 133 ( 19 ) page: 191002   2024.11

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    We present the first measurement of nuclear recoils from solar B8 neutrinos via coherent elastic neutrino-nucleus scattering with the XENONnT dark matter experiment. The central detector of XENONnT is a low-background, two-phase time projection chamber with a 5.9 t sensitive liquid xenon target. A blind analysis with an exposure of 3.51 t×yr resulted in 37 observed events above 0.5 keV, with (26.4-1.3+1.4) events expected from backgrounds. The background-only hypothesis is rejected with a statistical significance of 2.73σ. The measured B8 solar neutrino flux of (4.7-2.3+3.6)×106 cm-2 s-1 is consistent with results from the Sudbury Neutrino Observatory. The measured neutrino flux-weighted CEνNS cross section on Xe of (1.1-0.5+0.8)×10-39 cm2 is consistent with the Standard Model prediction. This is the first direct measurement of nuclear recoils from solar neutrinos with a dark matter detector.

    DOI: 10.1103/PhysRevLett.133.191002

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  12. The XENONnT dark matter experiment International coauthorship International journal Open Access

    Aprile, E; Aalbers, J; Abe, K; Maouloud, SA; Althueser, L; Andrieu, B; Angelino, E; Angevaare, JR; Antochi, VC; Martin, DA; Arneodo, F; Balata, M; Baudis, L; Baxter, AL; Bazyk, M; Bellagamba, L; Biondi, R; Bismark, A; Brookes, EJ; Brown, A; Bruenner, S; Bruno, G; Budnik, R; Bui, TK; Cai, C; Cardoso, JMR; Cassese, F; Chiarini, A; Cichon, D; Chavez, APC; Colijn, AP; Conrad, J; Corrieri, R; Cuenca-Garcia, JJ; Cussonneau, JP; Dadoun, O; D'Andrea, V; Decowski, MP; De Fazio, B; Gangi, PD; Diglio, S; Disdier, JM; Douillet, D; Eitel, K; Elykov, A; Farrell, S; Ferella, AD; Ferrari, C; Fischer, H; Flierman, M; Form, S; Front, D; Fulgione, W; Fuselli, C; Gaemers, P; Gaior, R; Rosso, AG; Galloway, M; Gao, F; Gardner, R; Garroum, N; Glade-Beucke, R; Grandi, L; Grigat, J; Guan, H; Guerzoni, M; Guida, M; Hammann, R; Higuera, A; Hils, C; Hoetzsch, L; Hood, NF; Howlett, J; Huhmann, C; Iacovacci, M; Iaquaniello, G; Iven, L; Itow, Y; Jakob, J; Joerg, F; Joy, A; Kara, M; Kavrigin, P; Kazama, S; Kobayashi, M; Koltman, G; Kopec, A; Kuger, F; Landsman, H; Lang, RF; Levinson, L; Li, I; Li, S; Liang, S; Lindemann, S; Lindner, M; Liu, K; Loizeau, J; Lombardi, F; Long, J; Lopes, JAM; Ma, Y; Macolino, C; Mahlstedt, J; Mancuso, A; Manenti, L; Marignetti, F; Undagoitia, TM; Martella, P; Martens, K; Masbou, J; Masson, D; Masson, E; Mastroianni, S; Mele, E; Messina, M; Michinelli, R; Miuchi, K; Molinario, A; Moriyama, S; Mora, K; Mosbacher, Y; Murra, M; Mueller, J; Ni, K; Nisi, S; Oberlack, U; Orlandi, D; Othegraven, R; Paetsch, B; Palacio, J; Parlati, S; Paschos, P; Pellegrini, Q; Peres, R; Peters, C; Pienaar, J; Pierre, M; Plante, G; Pollmann, TR; Qi, J; Qin, J; Garcia, DR; Rynge, M; Shi, J; Singh, R; Sanchez, L; dos Santos, JMF; Sarnoff, I; Sartorelli, G; Schreiner, J; Schulte, D; Schulte, P; Eissing, HS; Schumann, M; Lavina, LS; Selvi, M; Semeria, F; Shagin, P; Shi, S; Shockley, E; Silva, M; Simgen, H; Stephen, J; Stern, M; Stillwell, BK; Takeda, A; Tan, PL; Tatananni, D; Terliuk, A; Thers, D; Toschi, F; Trinchero, G; Tunnell, C; Tönnies, F; Valerius, K; Volta, G; Weinheimer, C; Weiss, M; Wenz, D; Westermann, J; Wittweg, C; Wolf, T; Wu, VHS; Xing, Y; Xu, D; Xu, Z; Yamashita, M; Yang, L; Ye, J; Yuan, L; Zavattini, G; Zhong, M; Zhu, T

    EUROPEAN PHYSICAL JOURNAL C   Vol. 84 ( 8 ) page: 784   2024.8

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    The multi-staged XENON program at INFN Laboratori Nazionali del Gran Sasso aims to detect dark matter with two-phase liquid xenon time projection chambers of increasing size and sensitivity. The XENONnT experiment is the latest detector in the program, planned to be an upgrade of its predecessor XENON1T. It features an active target of 5.9 tonnes of cryogenic liquid xenon (8.5 tonnes total mass in cryostat). The experiment is expected to extend the sensitivity to WIMP dark matter by more than an order of magnitude compared to XENON1T, thanks to the larger active mass and the significantly reduced background, improved by novel systems such as a radon removal plant and a neutron veto. This article describes the XENONnT experiment and its sub-systems in detail and reports on the detector performance during the first science run.

    DOI: 10.1140/epjc/s10052-024-12982-5

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  13. Offline tagging of radon-induced backgrounds in XENON1T and applicability to other liquid xenon time projection chambers Reviewed International coauthorship International journal Open Access

    Aprile, E; Aalbers, J; Abe, K; Maouloud, SA; Althueser, L; Andrieu, B; Angelino, E; Angevaare, JR; Martin, DA; Arneodo, F; Baudis, L; Baxter, AL; Bazyk, M; Bellagamba, L; Biondi, R; Bismark, A; Brookes, EJ; Brown, A; Bruno, G; Budnik, R; Bui, TK; Cardoso, JMR; Chavez, APC; Colijn, AP; Conrad, J; Cuenca-García, JJ; D'Andrea, V; Garcia, LCD; Decowski, MP; Di Donato, C; Di Gangi, P; Diglio, S; Eitel, K; Elykov, A; Ferella, AD; Ferrari, C; Fischer, H; Flehmke, T; Flierman, M; Fulgione, W; Fuselli, C; Gaemers, P; Gaior, R; Galloway, M; Gao, F; Ghosh, S; Glade-Beucke, R; Grandi, L; Grigat, J; Guan, H; Guida, M; Hammann, R; Higuera, A; Hils, C; Hoetzsch, L; Hood, NF; Iacovacci, M; Itow, Y; Jakob, J; Joerg, F; Joy, A; Kaminaga, Y; Kara, M; Kavrigin, P; Kazama, S; Kobayashi, M; Kopec, A; Kuger, F; Landsman, H; Lang, RF; Levinson, L; Li, I; Li, S; Liang, S; Lin, YT; Lindemann, S; Lindner, M; Liu, K; Loizeau, J; Lombardi, F; Long, J; Lopes, JAM; Luce, T; Ma, Y; Macolino, C; Mahlstedt, J; Mancuso, A; Manenti, L; Marignetti, F; Undagoitia, TM; Martens, K; Masbou, J; Masson, E; Mastroianni, S; Melchiorre, A; Messina, M; Michael, A; Miuchi, K; Molinario, A; Moriyama, S; Morå, K; Mosbacher, Y; Murra, M; Müller, J; Ni, K; Oberlack, U; Paetsch, B; Palacio, J; Pan, Y; Pellegrini, Q; Peres, R; Peters, C; Pienaar, J; Pierre, M; Plante, G; Pollmann, TR; Principe, L; Qi, J; Qin, J; García, DR; Rajado, M; Shi, J; Singh, R; Sanchez, L; dos Santos, JMF; Sarnoff, I; Sartorelli, G; Schreiner, J; Schulte, D; Schulte, P; Eissing, HS; Schumann, M; Lavina, LS; Selvi, M; Semeria, F; Shagin, P; Shi, S; Silva, M; Simgen, H; Takeda, A; Tan, PL; Terliuk, A; Thers, D; Toschi, F; Trinchero, G; Tunnell, C; Tönnies, F; Valerius, K; Vecchi, S; Vetter, S; Volta, G; Weinheimer, C; Weiss, M; Wenz, D; Wittweg, C; Wolf, T; Wu, VHS; Xing, Y; Xu, D; Xu, Z; Yamashita, M; Yang, L; Ye, J; Yuan, L; Zavattini, G; Zhong, M; Zhu, T

    PHYSICAL REVIEW D   Vol. 110 ( 1 )   2024.7

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    This paper details the first application of a software tagging algorithm to reduce radon-induced backgrounds in liquid noble element time projection chambers, such as XENON1T and XENONnT. The convection velocity field in XENON1T was mapped out using Rn222 and Po218 events, and the rms convection speed was measured to be 0.30±0.01 cm/s. Given this velocity field, Pb214 background events can be tagged when they are followed by Bi214 and Po214 decays, or preceded by Po218 decays. This was achieved by evolving a point cloud in the direction of a measured convection velocity field, and searching for Bi214 and Po214 decays or Po218 decays within a volume defined by the point cloud. In XENON1T, this tagging system achieved a Pb214 background reduction of 6.2-0.9+0.4% with an exposure loss of 1.8±0.2%, despite the timescales of convection being smaller than the relevant decay times. We show that the performance can be improved in XENONnT, and that the performance of such a software-tagging approach can be expected to be further improved in a diffusion-limited scenario. Finally, a similar method might be useful to tag the cosmogenic Xe137 background, which is relevant to the search for neutrinoless double-beta decay.

    DOI: 10.1103/PhysRevD.110.012011

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  14. Effective field theory and inelastic dark matter results from XENON1T Reviewed International coauthorship International journal Open Access

    Aprile, E; Abe, K; Agostini, F; Maouloud, SA; Althueser, L; Andrieu, B; Angelino, E; Angevaare, JR; Antochi, VC; Martin, DA; Arneodo, F; Baudis, L; Baxter, AL; Bellagamba, L; Biondi, R; Bismark, A; Brown, A; Bruenner, S; Bruno, G; Budnik, R; Cai, C; Capelli, C; Cardoso, JMR; Cichon, D; Clark, M; Colijn, AP; Conrad, J; Cuenca-García, JJ; Cussonneau, JP; D'Andrea, V; Decowski, MP; Di Gangi, P; Di Pede, S; Di Giovanni, A; Di Stefano, R; Diglio, S; Eitel, K; Elykov, A; Farrell, S; Ferella, AD; Fischer, H; Fulgione, W; Gaemers, P; Gaior, R; Rosso, AG; Galloway, M; Gao, F; Glade-Beucke, R; Grandi, L; Grigat, J; Guida, M; Hammann, R; Higuera, A; Hils, C; Hoetzsch, L; Howlett, J; Iacovacci, M; Itow, Y; Jakob, J; Joerg, F; Joy, A; Kato, N; Kara, M; Kavrigin, P; Kazama, S; Kobayashi, M; Koltman, G; Kopec, A; Landsman, H; Lang, RF; Levinson, L; Li, I; Li, S; Liang, S; Lindemann, S; Lindner, M; Liu, K; Loizeau, J; Lombardi, F; Long, J; Lopes, JAM; Ma, Y; Macolino, C; Mahlstedt, J; Mancuso, A; Manenti, L; Manfredini, A; Marignetti, F; Undagoitia, TM; Martens, K; Masbou, J; Masson, D; Masson, E; Mastroianni, S; Messina, M; Miuchi, K; Mizukoshi, K; Molinario, A; Moriyama, S; Morå, K; Mosbacher, Y; Murra, M; Müller, J; Ni, K; Oberlack, U; Paetsch, B; Palacio, J; Peres, R; Pienaar, J; Pierre, M; Pizzella, V; Plante, G; Qi, J; Qin, J; García, DR; Reichard, S; Rocchetti, A; Rupp, N; Sanchez, L; dos Santos, JMF; Sarnoff, I; Sartorelli, G; Schreiner, J; Schulte, D; Schulte, P; Eissing, HS; Schumann, M; Lavina, LS; Selvi, M; Semeria, F; Shagin, P; Shi, S; Shockley, E; Silva, M; Simgen, H; Takeda, A; Tan, PL; Terliuk, A; Thers, D; Toschi, F; Trinchero, G; Tunnell, C; Tönnies, F; Valerius, K; Volta, G; Wei, Y; Weinheimer, C; Weiss, M; Wenz, D; Wittweg, C; Wolf, T; Xu, D; Xu, Z; Yamashita, M; Yang, L; Ye, J; Yuan, L; Zavattini, G; Zhong, M; Zhu, T

    PHYSICAL REVIEW D   Vol. 109 ( 11 )   2024.6

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    In this work, we expand on the XENON1T nuclear recoil searches to study the individual signals of dark matter interactions from operators up to dimension eight in a chiral effective field theory (ChEFT) and a model of inelastic dark matter (iDM). We analyze data from two science runs of the XENON1T detector totaling 1 t×yr exposure. For these analyses, we extended the region of interest from [4.9,40.9] keVNR to [4.9,54.4] keVNR to enhance our sensitivity for signals that peak at nonzero energies. We show that the data are consistent with the background-only hypothesis, with a small background overfluctuation observed peaking between 20 and 50 keVNR, resulting in a maximum local discovery significance of 1.7σ for the Vector - Vectorstrange ChEFT channel for a dark matter particle of 70 GeV/c2 and 1.8σ for an iDM particle of 50 GeV/c2 with a mass splitting of 100 keV/c2. For each model, we report 90% confidence level upper limits. We also report upper limits on three benchmark models of dark matter interaction using ChEFT where we investigate the effect of isospin-breaking interactions. We observe rate-driven cancellations in regions of the isospin-breaking couplings, leading to up to 6 orders of magnitude weaker upper limits with respect to the isospin-conserving case.

    DOI: 10.1103/PhysRevD.109.112017

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  15. Design and performance of the field cage for the XENONnT experiment International coauthorship International journal Open Access

    Aprile, E; Abe, K; Maouloud, SA; Althueser, L; Andrieu, B; Angelino, E; Angevaare, JR; Antochi, VC; Martin, DA; Arneodo, F; Baudis, L; Baxter, AL; Bazyk, M; Bellagamba, L; Biondi, R; Bismark, A; Brookes, EJ; Brown, A; Bruenner, S; Bruno, G; Budnik, R; Bui, TK; Cai, C; Cardoso, JMR; Cichon, D; Chávez, APC; Colijn, AP; Conrad, J; Cuenca-Garcia, JJ; Cussonneau, JP; D'Andrea, V; Decowski, MP; Di Gangi, P; Diglio, S; Eitel, K; Elykov, A; Farrell, S; Ferella, AD; Ferrari, C; Fischer, H; Flierman, M; Fulgione, W; Fuselli, C; Gaemers, P; Gaior, R; Rosso, AG; Galloway, M; Gao, F; Glade-Beucke, R; Grandi, L; Grigat, J; Guan, H; Guida, M; Hammann, R; Higuera, A; Hils, C; Hoetzsch, L; Hood, NF; Howlett, J; Iacovacci, M; Itow, Y; Jakob, J; Joerg, F; Joy, A; Kara, M; Kavrigin, P; Kazama, S; Kobayashi, M; Koltman, G; Kopec, A; Kuger, F; Landsman, H; Lang, RF; Levinson, L; Li, I; Li, S; Liang, S; Lindemann, S; Lindner, M; Liu, K; Loizeau, J; Lombardi, F; Long, J; Lopes, JAM; Ma, Y; Macolino, C; Mahlstedt, J; Mancuso, A; Manenti, L; Marignetti, F; Undagoitia, TM; Martens, K; Masbou, J; Masson, D; Masson, E; Mastroianni, S; Messina, M; Miuchi, K; Molinario, A; Moriyama, S; Mora, K; Mosbacher, Y; Murra, M; Müller, J; Ni, K; Oberlack, U; Paetsch, B; Palacio, J; Pellegrini, Q; Peres, R; Peters, C; Pienaar, J; Pierre, M; Plante, G; Pollmann, TR; Qi, J; Qin, J; Garcia, DR; Sarcevic, N; Shi, J; Singh, R; Sanchez, L; dos Santos, JMF; Sarnoff, I; Sartorelli, G; Schreiner, J; Schulte, D; Schulte, P; Eissing, HS; Schumann, M; Lavina, LS; Selvi, M; Semeria, F; Shagin, P; Shi, S; Shockley, E; Silva, M; Simgen, H; Takeda, A; Tan, PL; Terliuk, A; Thers, D; Toschi, F; Trinchero, G; Tunnell, C; Tönnies, F; Valerius, K; Volta, G; Weinheimer, C; Weiss, M; Wenz, D; Wittweg, C; Wolf, T; Wu, VHS; Xing, Y; Xu, D; Xu, Z; Yamashita, M; Yang, L; Ye, J; Yuan, L; Zavattini, G; Zhong, M; Zhu, T

    EUROPEAN PHYSICAL JOURNAL C   Vol. 84 ( 2 )   2024.2

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    The precision in reconstructing events detected in a dual-phase time projection chamber depends on an homogeneous and well understood electric field within the liquid target. In the XENONnT TPC the field homogeneity is achieved through a double-array field cage, consisting of two nested arrays of field shaping rings connected by an easily accessible resistor chain. Rather than being connected to the gate electrode, the topmost field shaping ring is independently biased, adding a degree of freedom to tune the electric field during operation. Two-dimensional finite element simulations were used to optimize the field cage, as well as its operation. Simulation results were compared to <sup>83m</sup>Krcalibration data. This comparison indicates an accumulation of charge on the panels of the TPC which is constant over time, as no evolution of the reconstructed position distribution of events is observed. The simulated electric field was then used to correct the charge signal for the field dependence of the charge yield. This correction resolves the inconsistent measurement of the drift electron lifetime when using different calibrations sources and different field cage tuning voltages.

    DOI: 10.1140/epjc/s10052-023-12296-y

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  16. Cosmogenic background simulations for neutrinoless double beta decay with the DARWIN observatory at various underground sites International coauthorship International journal Open Access

    Adrover, M; Althueser, L; Andrieu, B; Angelino, E; Angevaare, JR; Antunovic, B; Aprile, E; Babicz, M; Bajpai, D; Barberio, E; Baudis, L; Bazyk, M; Bell, N; Bellagamba, L; Biondi, R; Biondi, Y; Bismark, A; Boehm, C; Breskin, A; Brookes, EJ; Brown, A; Bruno, G; Budnik, R; Capelli, C; Cardoso, JMR; Chauvin, A; Chavez, APC; Colijn, AP; Conrad, J; Cuenca-García, JJ; D'Andrea, V; Decowski, MP; Deisting, A; Di Gangi, P; Diglio, S; Doerenkamp, M; Drexlin, G; Eitel, K; Elykov, A; Engel, R; Farrell, S; Ferella, AD; Ferrari, C; Fischer, H; Flierman, M; Fulgione, W; Gaemers, P; Gaior, R; Galloway, M; Garroum, N; Ghosh, S; Girard, F; Glade-Beucke, R; Glück, F; Grandi, L; Grigat, J; Grössle, R; Guan, H; Guida, M; Hammann, R; Hannen, V; Hansmann-Menzemer, S; Hargittai, N; Hasegawa, T; Hils, C; Higuera, A; Hiraoka, K; Hoetzsch, L; Iacovacci, M; Itow, Y; Jakob, J; Jörg, F; Kara, M; Kavrigin, P; Kazama, S; Keller, M; Kilminster, B; Kleifges, M; Kobayashi, M; Kopec, A; von Krosigk, B; Kuger, F; Landsman, H; Lang, RF; Li, I; Li, S; Liang, S; Lindemann, S; Lindner, M; Lombardi, F; Loizeau, J; Luce, T; Ma, Y; Macolino, C; Mahlstedt, J; Mancuso, A; Undagoitia, TM; Lopes, JAM; Marignetti, F; Martens, K; Masbou, J; Mastroianni, S; Milutinovic, S; Miuchi, K; Miyata, R; Molinario, A; Monteiro, CMB; Morå, K; Morteau, E; Mosbacher, Y; Müller, J; Murra, M; Newstead, JL; Ni, K; Oberlack, UG; Ostrovskiy, I; Paetsch, B; Pandurovic, M; Pellegrini, Q; Peres, R; Pienaar, J; Pierre, M; Piotter, M; Plante, G; Pollmann, TR; Principe, L; Qi, J; Qin, J; Silva, MR; García, DR; Razeto, A; Sakamoto, S; Sanchez, L; Sanchez-Lucas, P; dos Santos, JMF; Sartorelli, G; Scaffidi, A; Schulte, P; Schultz-Coulon, HC; Eissing, HS; Schumann, M; Lavina, LS; Selvi, M; Semeria, F; Shagin, P; Sharma, S; Shen, W; Silva, M; Simgen, H; Singh, R; Solmaz, M; Stanley, O; Steidl, M; Tan, PL; Terliuk, A; Thers, D; Thuemmler, T; Toennies, F; Toschi, F; Trinchero, G; Trotta, R; Tunnell, C; Urquijo, P; Valerius, K; Vecchi, S; Vetter, S; Volta, G; Vorkapic, D; Wang, W; Weerman, KM; Weinheimer, C; Weiss, M; Wenz, D; Wittweg, C; Wolf, J; Wolf, T; Wu, VHS; Wurm, M; Xing, Y; Yamashita, M; Ye, J; Zavattini, G; Zuber, K

    EUROPEAN PHYSICAL JOURNAL C   Vol. 84 ( 1 )   2024.1

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    Xenon dual-phase time projections chambers (TPCs) have proven to be a successful technology in studying physical phenomena that require low-background conditions. With 40t of liquid xenon (LXe) in the TPC baseline design, DARWIN will have a high sensitivity for the detection of particle dark matter, neutrinoless double beta decay (0 ν β β), and axion-like particles (ALPs). Although cosmic muons are a source of background that cannot be entirely eliminated, they may be greatly diminished by placing the detector deep underground. In this study, we used Monte Carlo simulations to model the cosmogenic background expected for the DARWIN observatory at four underground laboratories: Laboratori Nazionali del Gran Sasso (LNGS), Sanford Underground Research Facility (SURF), Laboratoire Souterrain de Modane (LSM) and SNOLAB. We present here the results of simulations performed to determine the production rate of <sup>137</sup> Xe, the most crucial isotope in the search for 0 ν β β of <sup>136</sup> Xe. Additionally, we explore the contribution that other muon-induced spallation products, such as other unstable xenon isotopes and tritium, may have on the cosmogenic background.

    DOI: 10.1140/epjc/s10052-023-12298-w

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  17. Search for events in XENON1T associated with gravitational waves International coauthorship International journal Open Access

    Aprile, E; Abe, K; Maouloud, SA; Althueser, L; Andrieu, B; Angelino, E; Angevaare, JR; Antochi, VC; Martin, DA; Arneodo, F; Baudis, L; Baxter, AL; Bazyk, M; Bellagamba, L; Biondi, R; Bismark, A; Brookes, EJ; Brown, A; Bruenner, S; Bruno, G; Budnik, R; Bui, TK; Cai, C; Cardoso, JMR; Chavez, APC; Colijn, AP; Conrad, J; Cuenca-García, JJ; D'Andrea, V; Decowski, MP; Di Gangi, P; Diglio, S; Eitel, K; Elykov, A; Farrell, S; Ferella, AD; Ferrari, C; Fischer, H; Flierman, M; Fulgione, W; Fuselli, C; Gaemers, P; Gaior, R; Rosso, AG; Galloway, M; Gao, F; Glade-Beucke, R; Grandi, L; Grigat, J; Guan, H; Guida, M; Hammann, R; Higuera, A; Hils, C; Hoetzsch, L; Hood, NF; Howlett, J; Iacovacci, M; Itow, Y; Jakob, J; Joerg, F; Joy, A; Kara, M; Kavrigin, P; Kazama, S; Kobayashi, M; Koltman, G; Kopec, A; Kuger, F; Landsman, H; Lang, RF; Carlos, DGL; Levinson, L; Li, I; Li, S; Liang, S; Lindemann, S; Lindner, M; Liu, K; Loizeau, J; Lombardi, F; Long, J; Lopes, JAM; Ma, Y; Macolino, C; Mahlstedt, J; Mancuso, A; Manenti, L; Marignetti, F; Undagoitia, TM; Martens, K; Masbou, J; Masson, D; Masson, E; Mastroianni, S; Messina, M; Miuchi, K; Molinario, A; Moriyama, S; Morå, K; Mosbacher, Y; Murra, M; Müller, J; Ni, K; Oberlack, U; Paetsch, B; Palacio, J; Pellegrini, Q; Peres, R; Peters, C; Pienaar, J; Pierre, M; Plante, G; Pollmann, TR; Qi, J; Qin, J; García, DR; Shi, J; Singh, R; Sanchez, L; dos Santos, JMF; Sarnoff, I; Sartorelli, G; Schreiner, J; Schulte, D; Schulte, P; Eissing, HS; Schumann, M; Lavina, LS; Selvi, M; Semeria, F; Shagin, P; Shi, S; Shockley, E; Silva, M; Simgen, H; Takeda, A; Tan, PL; Terliuk, A; Thers, D; Toschi, F; Trinchero, G; Tunnell, C; Tönnies, F; Valerius, K; Volta, G; Weinheimer, C; Weiss, M; Wenz, D; Wittweg, C; Wolf, T; Wu, VHS; Xing, Y; Xu, D; Xu, Z; Yamashita, M; Yang, L; Ye, J; Yuan, L; Zavattini, G; Zhong, M; Zhu, T

    PHYSICAL REVIEW D   Vol. 108 ( 7 )   2023.10

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    We perform a blind search for particle signals in the XENON1T dark matter detector that occur close in time to gravitational-wave signals in the LIGO and Virgo observatories. No particle signal is observed in the nuclear recoil and electronic recoil channels within ±500 seconds of observations of the gravitational-wave signals GW170104, GW170729, GW170817, GW170818, and GW170823. We use this null result to constrain monoenergetic neutrinos and axion-like particles emitted in the closest coalescence GW170817, a binary neutron star merger. We set new upper limits on the fluence (time-integrated flux) of coincident neutrinos down to 17 keV at the 90% confidence level. Furthermore, we constrain the product of the coincident fluence and cross section of axion-like particles to be less than 10-29 cm2/cm2 in the [5.5-210] keV energy range at the 90% confidence level.

    DOI: 10.1103/PhysRevD.108.072015

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  18. Direct dark matter searches with the full data set of XMASS-I International coauthorship International journal

    Abe K., Hiraide K., Kato N., Moriyama S., Nakahata M., Sato K., Sekiya H., Suzuki T., Suzuki Y., Takeda A., Yang B.S., Kim N.Y., Kim Y.D., Kim Y.H., Itow Y., Martens K., Mason A., Yamashita M., Miuchi K., Takeuchi Y., Lee K.B., Lee M.K., Fukuda Y., Ogawa H., Ichimura K., Kishimoto Y., Nishijima K., Fushimi K., Xu B.D., Kobayashi K., Nakamura S.

    Physical Review D   Vol. 108 ( 8 )   2023.10

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    Various weakly interacting massive particle (WIMP) dark matter searches using the full data set of XMASS-I, a single-phase liquid xenon detector, are reported in this paper. Stable XMASS-I data taking accumulated a total live time of 1590.9 days between November 20, 2013 and February 1, 2019 with an analysis threshold of 1.0 keVee. In the latter half of data taking a lower analysis threshold of 0.5 keVee was also available through a new low threshold trigger. Searching for a WIMP signal in the detector's 97 kg fiducial volume yielded a limit on the WIMP-nucleon scattering cross section of 1.4×10-44 cm2 for a 60 GeV/c2 WIMP at the 90% confidence level. We also searched for WIMP induced annual modulation signatures in the detector's whole target volume, containing 832 kg of liquid xenon. For nuclear recoils of a 8 GeV/c2 WIMP this analysis yielded a 90% confidence level (CL) cross section limit of 2.3×10-42 cm2. Annual modulation signatures from the Migdal effect and bremsstrahlung at a WIMP mass of 0.5 GeV/c2 are evaluated and lead to 90% CL cross section limits of 1.4×10-35 cm2 and 1.1×10-33 cm2, respectively.

    DOI: 10.1103/PhysRevD.108.083022

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  19. First Dark Matter Search with Nuclear Recoils from the XENONnT Experiment International coauthorship International journal Open Access

    E. Aprile, K. Abe, F. Agostini, S. Ahmed Maouloud, L. Althueser, B. Andrieu, E. Angelino, J. R. Angevaare, V. C. Antochi, D. Antón Martin, F. Arneodo, L. Baudis, A. L. Baxter, M. Bazyk, L. Bellagamba, R. Biondi, A. Bismark, E. J. Brookes, A. Brown, S. Bruenner, G. Bruno, R. Budnik, T. K. Bui, C. Cai, J. M.R. Cardoso, D. Cichon, A. P. Cimental Chavez, A. P. Colijn, J. Conrad, J. J. Cuenca-García, J. P. Cussonneau, V. D'Andrea, M. P. Decowski, P. Di Gangi, S. Di Pede, S. Diglio, K. Eitel, A. Elykov, S. Farrell, A. D. Ferella, C. Ferrari, H. Fischer, M. Flierman, W. Fulgione, C. Fuselli, P. Gaemers, R. Gaior, A. Gallo Rosso, M. Galloway, F. Gao, R. Glade-Beucke, L. Grandi, J. Grigat, H. Guan, M. Guida, R. Hammann, A. Higuera, C. Hils, L. Hoetzsch, N. F. Hood, J. Howlett, M. Iacovacci, Y. Itow, J. Jakob, F. Joerg, A. Joy, N. Kato, M. Kara, P. Kavrigin, S. Kazama, M. Kobayashi, G. Koltman, A. Kopec, F. Kuger, H. Landsman, R. F. Lang, L. Levinson, I. Li, S. Li, S. Liang, S. Lindemann, M. Lindner, K. Liu, J. Loizeau, F. Lombardi, J. Long, J. A.M. Lopes, Y. Ma, C. Macolino, J. Mahlstedt, A. Mancuso, L. Manenti, F. Marignetti, T. Marrodán Undagoitia, K. Martens, J. Masbou, D. Masson, E. Masson, S. Mastroianni, M. Messina

    Physical Review Letters   Vol. 131 ( 4 ) page: 041003   2023.7

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    DOI: 10.1103/PhysRevLett.131.041003

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  20. Detector signal characterization with a Bayesian network in XENONnT International coauthorship International journal Open Access

    E. Aprile, K. Abe, S. Ahmed Maouloud, L. Althueser, B. Andrieu, E. Angelino, J. R. Angevaare, V. C. Antochi, D. Antón Martin, F. Arneodo, L. Baudis, A. L. Baxter, M. Bazyk, L. Bellagamba, R. Biondi, A. Bismark, E. J. Brookes, A. Brown, S. Bruenner, G. Bruno, R. Budnik, T. K. Bui, C. Cai, J. M.R. Cardoso, D. Cichon, A. P. Cimental Chavez, A. P. Colijn, J. Conrad, J. J. Cuenca-García, J. P. Cussonneau, V. D'Andrea, M. P. Decowski, P. Di Gangi, S. Di Pede, S. Diglio, K. Eitel, A. Elykov, S. Farrell, A. D. Ferella, C. Ferrari, H. Fischer, M. Flierman, W. Fulgione, C. Fuselli, P. Gaemers, R. Gaior, A. Gallo Rosso, M. Galloway, F. Gao, R. Glade-Beucke, L. Grandi, J. Grigat, H. Guan, M. Guida, R. Hammann, A. Higuera, C. Hils, L. Hoetzsch, N. F. Hood, J. Howlett, M. Iacovacci, Y. Itow, J. Jakob, F. Joerg, A. Joy, N. Kato, M. Kara, P. Kavrigin, S. Kazama, M. Kobayashi, G. Koltman, A. Kopec, F. Kuger, H. Landsman, R. F. Lang, L. Levinson, I. Li, S. Li, S. Liang, S. Lindemann, M. Lindner, K. Liu, J. Loizeau, F. Lombardi, J. Long, J. A.M. Lopes, Y. Ma, C. MacOlino, J. Mahlstedt, A. Mancuso, L. Manenti, F. Marignetti, T. Marrodán Undagoitia, K. Martens, J. Masbou, D. Masson, E. Masson, S. Mastroianni, M. Messina, K. Miuchi

    Physical Review D   Vol. 108 ( 1 )   2023.7

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    DOI: 10.1103/PhysRevD.108.012016

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  21. The triggerless data acquisition system of the XENONnT experiment International coauthorship International journal Open Access

    E. Aprile, J. Aalbers, K. Abe, F. Agostini, S. Ahmed Maouloud, L. Althueser, B. Andrieu, E. Angelino, J. Angevaare, V. Antochi, D. Antón Martin, F. Arneodo, L. Baudis, A. Baxter, L. Bellagamba, R. Biondi, A. Bismark, E. Brookes, A. Brown, S. Bruenner, G. Bruno, R. Budnik, T. Bui, C. Cai, J. Cardoso, D. Cichon, A. Cimental Chavez, D. Coderre, A. Colijn, J. Conrad, J. Cuenca-García, J. Cussonneau, V. D'Andrea, M. Decowski, P. Di Gangi, S. Di Pede, S. Diglio, K. Eitel, A. Elykov, S. Farrell, A. Ferella, C. Ferrari, H. Fischer, M. Flierman, W. Fulgione, C. Fuselli, P. Gaemers, R. Gaior, A. Gallo Rosso, M. Galloway, F. Gao, R. Glade-Beucke, L. Grandi, J. Grigat, M. Guida, R. Hammann, A. Higuera, C. Hils, L. Hoetzsch, N. Hood, J. Howlett, M. Iacovacci, Y. Itow, J. Jakob, F. Joerg, A. Joy, N. Kato, M. Kara, P. Kavrigin, S. Kazama, M. Kobayashi, G. Koltman, A. Kopec, F. Kuger, H. Landsman, R. Lang, L. Levinson, I. Li, S. Li, S. Liang, S. Lindemann, M. Lindner, K. Liu, J. Loizeau, F. Lombardi, J. Long, J. Lopes, Y. Ma, C. Macolino, J. Mahlstedt, A. Mancuso, L. Manenti, F. Marignetti, T. Marrodán Undagoitia, K. Martens, J. Masbou, D. Masson, E. Masson, S. Mastroianni, M. Messina

    Journal of Instrumentation   Vol. 18 ( 7 )   2023.7

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    DOI: 10.1088/1748-0221/18/07/P07054

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  22. Searching for Heavy Dark Matter near the Planck Mass with XENON1T International coauthorship International journal Open Access

    E. Aprile, K. Abe, S. Ahmed Maouloud, L. Althueser, B. Andrieu, E. Angelino, J. R. Angevaare, V. C. Antochi, D. Antón Martin, F. Arneodo, L. Baudis, A. L. Baxter, M. Bazyk, L. Bellagamba, R. Biondi, A. Bismark, E. J. Brookes, A. Brown, S. Bruenner, G. Bruno, R. Budnik, T. K. Bui, C. Cai, J. M.R. Cardoso, D. Cichon, A. P. Cimental Chavez, M. Clark, A. P. Colijn, J. Conrad, J. J. Cuenca-García, J. P. Cussonneau, V. D'Andrea, M. P. Decowski, P. Di Gangi, S. Di Pede, S. Diglio, K. Eitel, A. Elykov, S. Farrell, A. D. Ferella, C. Ferrari, H. Fischer, M. Flierman, W. Fulgione, C. Fuselli, P. Gaemers, R. Gaior, A. Gallo Rosso, M. Galloway, F. Gao, R. Glade-Beucke, L. Grandi, J. Grigat, H. Guan, M. Guida, R. Hammann, A. Higuera, C. Hils, L. Hoetzsch, N. F. Hood, J. Howlett, M. Iacovacci, Y. Itow, J. Jakob, F. Joerg, A. Joy, N. Kato, M. Kara, P. Kavrigin, S. Kazama, M. Kobayashi, G. Koltman, A. Kopec, F. Kuger, H. Landsman, R. F. Lang, L. Levinson, I. Li, S. Li, S. Liang, S. Lindemann, M. Lindner, K. Liu, J. Loizeau, F. Lombardi, J. Long, J. A.M. Lopes, Y. Ma, C. Macolino, J. Mahlstedt, A. Mancuso, L. Manenti, F. Marignetti, T. Marrodán Undagoitia, K. Martens, J. Masbou, D. Masson, E. Masson, S. Mastroianni, M. Messina

    Physical Review Letters   Vol. 130 ( 26 ) page: 261002   2023.6

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    DOI: 10.1103/PhysRevLett.130.261002

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  23. Low-energy calibration of XENON1T with an internal <sup>37</sup> Ar source International coauthorship International journal Open Access

    E. Aprile, K. Abe, F. Agostini, S. Ahmed Maouloud, M. Alfonsi, L. Althueser, B. Andrieu, E. Angelino, J. R. Angevaare, V. C. Antochi, D. Antón Martin, F. Arneodo, L. Baudis, A. L. Baxter, L. Bellagamba, R. Biondi, A. Bismark, A. Brown, S. Bruenner, G. Bruno, R. Budnik, T. K. Bui, C. Cai, C. Capelli, J. M.R. Cardoso, D. Cichon, A. P. Colijn, J. Conrad, J. J. Cuenca-García, J. P. Cussonneau, V. D’Andrea, M. P. Decowski, P. Di Gangi, S. Di Pede, S. Diglio, K. Eitel, A. Elykov, S. Farrell, A. D. Ferella, C. Ferrari, H. Fischer, W. Fulgione, P. Gaemers, R. Gaior, A. Gallo Rosso, M. Galloway, F. Gao, R. Glade-Beucke, L. Grandi, J. Grigat, M. Guida, R. Hammann, A. Higuera, C. Hils, L. Hoetzsch, J. Howlett, M. Iacovacci, Y. Itow, J. Jakob, F. Joerg, A. Joy, N. Kato, M. Kara, P. Kavrigin, S. Kazama, M. Kobayashi, G. Koltman, A. Kopec, F. Kuger, H. Landsman, R. F. Lang, L. Levinson, I. Li, S. Li, S. Liang, S. Lindemann, M. Lindner, K. Liu, J. Loizeau, F. Lombardi, J. Long, J. A.M. Lopes, Y. Ma, C. Macolino, J. Mahlstedt, A. Mancuso, L. Manenti, F. Marignetti, T. Marrodán Undagoitia, K. Martens, J. Masbou, D. Masson, E. Masson, S. Mastroianni, M. Messina, K. Miuchi, K. Mizukoshi, A. Molinario, S. Moriyama, K. Morå

    European Physical Journal C   Vol. 83 ( 6 )   2023.6

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    DOI: 10.1140/epjc/s10052-023-11512-z

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  24. A next-generation liquid xenon observatory for dark matter and neutrino physics Reviewed International coauthorship International journal Open Access

    J. Aalbers, S. S. Abdussalam, K. Abe, V. Aerne, F. Agostini, S. Ahmed Maouloud, D. S. Akerib, D. Y. Akimov, J. Akshat, A. K. Al Musalhi, F. Alder, S. K. Alsum, L. Althueser, C. S. Amarasinghe, F. D. Amaro, A. Ames, T. J. Anderson, B. Andrieu, N. Angelides, E. Angelino, J. Angevaare, V. C. Antochi, D. Antón Martin, B. Antunovic, E. Aprile, H. M. Araújo, J. E. Armstrong, F. Arneodo, M. Arthurs, P. Asadi, S. Baek, X. Bai, D. Bajpai, A. Baker, J. Balajthy, S. Balashov, M. Balzer, A. Bandyopadhyay, J. Bang, E. Barberio, J. W. Bargemann, L. Baudis, D. Bauer, D. Baur, A. L. Baxter, A. L. Baxter, M. Bazyk, K. Beattie, J. Behrens, N. F. Bell, L. Bellagamba, P. Beltrame, M. Benabderrahmane, E. P. Bernard, G. F. Bertone, P. Bhattacharjee, A. Bhatti, A. Biekert, T. P. Biesiadzinski, A. R. Binau, R. Biondi, Y. Biondi, H. J. Birch, F. Bishara, A. Bismark, C. Blanco, G. M. Blockinger, E. Bodnia, C. Boehm, A. I. Bolozdynya, P. D. Bolton, S. Bottaro, C. Bourgeois, B. Boxer, P. Brás, A. Breskin, P. A. Breur, C. A.J. Brew, J. Brod, E. Brookes, A. Brown, E. Brown, S. Bruenner, G. Bruno, R. Budnik, T. K. Bui, S. Burdin, S. Buse, J. K. Busenitz, D. Buttazzo, M. Buuck, A. Buzulutskov, R. Cabrita, C. Cai, D. Cai, C. Capelli, J. M.R. Cardoso, M. C. Carmona-Benitez, M. Cascella, R. Catena

    Journal of Physics G: Nuclear and Particle Physics   Vol. 50 ( 1 )   2023.1

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  25. An approximate likelihood for nuclear recoil searches with XENON1T data International coauthorship International journal Open Access

    E. Aprile, K. Abe, F. Agostini, S. Ahmed Maouloud, M. Alfonsi, L. Althueser, B. Andrieu, E. Angelino, J. R. Angevaare, V. C. Antochi, D. Antón Martin, F. Arneodo, L. Baudis, A. L. Baxter, L. Bellagamba, R. Biondi, A. Bismark, A. Brown, S. Bruenner, G. Bruno, R. Budnik, C. Capelli, J. M.R. Cardoso, D. Cichon, B. Cimmino, M. Clark, A. P. Colijn, J. Conrad, J. J. Cuenca-García, J. P. Cussonneau, V. D’Andrea, M. P. Decowski, P. Di Gangi, S. Di Pede, A. Di Giovanni, R. Di Stefano, S. Diglio, A. Elykov, S. Farrell, A. D. Ferella, H. Fischer, W. Fulgione, P. Gaemers, R. Gaior, M. Galloway, F. Gao, R. Glade-Beucke, L. Grandi, J. Grigat, A. Higuera, C. Hils, L. Hoetzsch, J. Howlett, M. Iacovacci, Y. Itow, J. Jakob, F. Joerg, A. Joy, N. Kato, P. Kavrigin, S. Kazama, M. Kobayashi, G. Koltman, A. Kopec, H. Landsman, R. F. Lang, L. Levinson, I. Li, S. Li, S. Liang, S. Lindemann, M. Lindner, K. Liu, F. Lombardi, J. Long, J. A.M. Lopes, Y. Ma, C. Macolino, J. Mahlstedt, A. Mancuso, L. Manenti, A. Manfredini, F. Marignetti, T. Marrodán Undagoitia, K. Martens, J. Masbou, D. Masson, E. Masson, S. Mastroianni, M. Messina, K. Miuchi, K. Mizukoshi, A. Molinario, S. Moriyama, K. Morå, Y. Mosbacher, M. Murra, J. Müller, K. Ni, U. Oberlack

    European Physical Journal C   Vol. 82 ( 11 )   2022.11

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  26. Search for New Physics in Electronic Recoil Data from XENONnT International coauthorship International journal Open Access

    E. Aprile, K. Abe, F. Agostini, S. Ahmed Maouloud, L. Althueser, B. Andrieu, E. Angelino, J. R. Angevaare, V. C. Antochi, D. Antón Martin, F. Arneodo, L. Baudis, A. L. Baxter, L. Bellagamba, R. Biondi, A. Bismark, A. Brown, S. Bruenner, G. Bruno, R. Budnik, T. K. Bui, C. Cai, C. Capelli, J. M.R. Cardoso, D. Cichon, M. Clark, A. P. Colijn, J. Conrad, J. J. Cuenca-García, J. P. Cussonneau, V. D'Andrea, M. P. Decowski, P. Di Gangi, S. Di Pede, A. Di Giovanni, R. Di Stefano, S. Diglio, K. Eitel, A. Elykov, S. Farrell, A. D. Ferella, C. Ferrari, H. Fischer, W. Fulgione, P. Gaemers, R. Gaior, A. Gallo Rosso, M. Galloway, F. Gao, R. Gardner, R. Glade-Beucke, L. Grandi, J. Grigat, M. Guida, R. Hammann, A. Higuera, C. Hils, L. Hoetzsch, J. Howlett, M. Iacovacci, Y. Itow, J. Jakob, F. Joerg, A. Joy, N. Kato, M. Kara, P. Kavrigin, S. Kazama, M. Kobayashi, G. Koltman, A. Kopec, F. Kuger, H. Landsman, R. F. Lang, L. Levinson, I. Li, S. Li, S. Liang, S. Lindemann, M. Lindner, K. Liu, J. Loizeau, F. Lombardi, J. Long, J. A.M. Lopes, Y. Ma, C. Macolino, J. Mahlstedt, A. Mancuso, L. Manenti, F. Marignetti, T. Marrodán Undagoitia, K. Martens, J. Masbou, D. Masson, E. Masson, S. Mastroianni, M. Messina, K. Miuchi, K. Mizukoshi

    Physical Review Letters   Vol. 129 ( 16 ) page: 161805   2022.10

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  27. Search for neutrinoless quadruple beta decay of <sup>136</sup>Xe in XMASS-I International coauthorship International journal Open Access

    K. Abe, K. Hiraide, K. Ichimura, N. Kato, Y. Kishimoto, K. Kobayashi, M. Kobayashi, S. Moriyama, M. Nakahata, K. Sato, H. Sekiya, T. Suzuki, A. Takeda, S. Tasaka, M. Yamashita, B. S. Yang, N. Y. Kim, Y. D. Kim, Y. H. Kim, R. Ishii, Y. Itow, K. Kanzawa, K. Masuda, K. Martens, A. Mason, Y. Suzuki, K. Miuchi, Y. Takeuchi, K. B. Lee, M. K. Lee, Y. Fukuda, H. Ogawa, K. Nishijima, K. Fushimi, B. D. Xu, S. Nakamura

    Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics   Vol. 833   page: 137355 - 137355   2022.10

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    DOI: 10.1016/j.physletb.2022.137355

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  28. Double-weak decays of Xe 124 and Xe 136 in the XENON1T and XENONnT experiments International coauthorship International journal Open Access

    E. Aprile, K. Abe, F. Agostini, S. Ahmed Maouloud, M. Alfonsi, L. Althueser, B. Andrieu, E. Angelino, J. R. Angevaare, V. C. Antochi, D. Antón Martin, F. Arneodo, L. Baudis, A. L. Baxter, L. Bellagamba, R. Biondi, A. Bismark, A. Brown, S. Bruenner, G. Bruno, R. Budnik, C. Cai, C. Capelli, J. M.R. Cardoso, D. Cichon, M. Clark, A. P. Colijn, J. Conrad, J. J. Cuenca-García, J. P. Cussonneau, V. D'Andrea, M. P. Decowski, P. Di Gangi, S. Di Pede, A. Di Giovanni, R. Di Stefano, S. Diglio, K. Eitel, A. Elykov, S. Farrell, A. D. Ferella, H. Fischer, W. Fulgione, P. Gaemers, R. Gaior, A. Gallo Rosso, M. Galloway, F. Gao, R. Glade-Beucke, L. Grandi, J. Grigat, M. Guida, A. Higuera, C. Hils, L. Hoetzsch, J. Howlett, M. Iacovacci, Y. Itow, J. Jakob, F. Joerg, A. Joy, N. Kato, M. Kara, P. Kavrigin, S. Kazama, M. Kobayashi, G. Koltman, A. Kopec, H. Landsman, R. F. Lang, L. Levinson, I. Li, S. Li, S. Liang, S. Lindemann, M. Lindner, K. Liu, J. Loizeau, F. Lombardi, J. Long, J. A.M. Lopes, Y. Ma, C. Macolino, J. Mahlstedt, A. Mancuso, L. Manenti, A. Manfredini, F. Marignetti, T. Marrodán Undagoitia, K. Martens, J. Masbou, D. Masson, E. Masson, S. Mastroianni, M. Messina, K. Miuchi, K. Mizukoshi, A. Molinario, S. Moriyama, K. Morå

    Physical Review C   Vol. 106 ( 2 )   2022.8

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  29. Material radiopurity control in the XENONnT experiment International coauthorship International journal Open Access

    E. Aprile, K. Abe, F. Agostini, S. Ahmed Maouloud, M. Alfonsi, L. Althueser, E. Angelino, J. R. Angevaare, V. C. Antochi, D. Antón Martin, F. Arneodo, L. Baudis, A. L. Baxter, L. Bellagamba, R. Biondi, A. Bismark, A. Brown, S. Bruenner, G. Bruno, R. Budnik, C. Capelli, J. M.R. Cardoso, D. Cichon, B. Cimmino, M. Clark, A. P. Colijn, J. Conrad, J. J. Cuenca-García, J. P. Cussonneau, V. D’Andrea, M. P. Decowski, P. Di Gangi, S. Di Pede, A. Di Giovanni, R. Di Stefano, S. Diglio, A. Elykov, S. Farrell, A. D. Ferella, H. Fischer, W. Fulgione, P. Gaemers, R. Gaior, M. Galloway, F. Gao, R. Glade-Beucke, L. Grandi, J. Grigat, A. Higuera, C. Hils, K. Hiraide, L. Hoetzsch, J. Howlett, M. Iacovacci, Y. Itow, J. Jakob, F. Joerg, N. Kato, P. Kavrigin, S. Kazama, M. Kobayashi, G. Koltman, A. Kopec, H. Landsman, R. F. Lang, L. Levinson, I. Li, S. Liang, S. Lindemann, M. Lindner, K. Liu, F. Lombardi, J. Long, J. A.M. Lopes, Y. Ma, C. Macolino, J. Mahlstedt, A. Mancuso, L. Manenti, A. Manfredini, F. Marignetti, T. Marrodán Undagoitia, K. Martens, J. Masbou, D. Masson, E. Masson, S. Mastroianni, M. Messina, K. Miuchi, K. Mizukoshi, A. Molinario, S. Moriyama, K. Morå, Y. Mosbacher, M. Murra, K. Ni, U. Oberlack, J. Palacio, R. Peres, J. Pienaar

    European Physical Journal C   Vol. 82 ( 7 ) page: 599   2022.7

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  30. Emission of single and few electrons in XENON1T and limits on light dark matter International coauthorship International journal Open Access

    E. Aprile, K. Abe, F. Agostini, S. Ahmed Maouloud, M. Alfonsi, L. Althueser, E. Angelino, J. R. Angevaare, V. C. Antochi, D. Antón Martin, F. Arneodo, L. Baudis, A. L. Baxter, L. Bellagamba, A. Bernard, R. Biondi, A. Bismark, A. Brown, S. Bruenner, G. Bruno, R. Budnik, C. Capelli, J. M.R. Cardoso, D. Cichon, B. Cimmino, M. Clark, A. P. Colijn, J. Conrad, J. J. Cuenca-García, J. P. Cussonneau, V. D'Andrea, M. P. Decowski, P. Di Gangi, S. Di Pede, A. Di Giovanni, R. Di Stefano, S. Diglio, A. Elykov, S. Farrell, A. D. Ferella, H. Fischer, W. Fulgione, P. Gaemers, R. Gaior, M. Galloway, F. Gao, R. Glade-Beucke, L. Grandi, J. Grigat, A. Higuera, C. Hils, L. Hoetzsch, J. Howlett, M. Iacovacci, Y. Itow, J. Jakob, F. Joerg, A. Joy, N. Kato, P. Kavrigin, S. Kazama, M. Kobayashi, G. Koltman, A. Kopec, H. Landsman, R. F. Lang, L. Levinson, I. Li, S. Li, S. Liang, S. Lindemann, M. Lindner, K. Liu, F. Lombardi, J. Long, J. A.M. Lopes, Y. Ma, C. Macolino, J. Mahlstedt, A. Mancuso, L. Manenti, A. Manfredini, F. Marignetti, T. Marrodán Undagoitia, K. Martens, J. Masbou, D. Masson, E. Masson, S. Mastroianni, M. Messina, K. Miuchi, K. Mizukoshi, A. Molinario, S. Moriyama, K. Morå, Y. Mosbacher, M. Murra, J. Müller, K. Ni, U. Oberlack

    Physical Review D   Vol. 106 ( 2 )   2022.7

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  31. Application and modeling of an online distillation method to reduce krypton and argon in XENON1T International coauthorship International journal Open Access

    E. Aprile, K. Abe, F. Agostini, S. Ahmed Maouloud, M. Alfonsi, L. Althueser, E. Angelino, J. R. Angevaare, V. C. Antochi, D. Antón Martin, F. Arneodo, L. Baudis, A. L. Baxter, L. Bellagamba, A. Bernard, R. Biondi, A. Bismark, A. Brown, S. Bruenner, G. Bruno, R. Budnik, C. Capelli, J. M.R. Cardoso, D. Cichon, B. Cimmino, M. Clark, A. P. Colijn, J. Conrad, J. J. Cuenca-García, J. P. Cussonneau, V. D'Andrea, M. P. Decowski, P. Di Gangi, S. Di Pede, A. Di Giovanni, R. Di Stefano, S. Diglio, A. Elykov, S. Farrell, A. D. Ferella, H. Fischer, S. Form, W. Fulgione, P. Gaemers, R. Gaior, M. Galloway, F. Gao, R. Glade-Beucke, L. Grandi, J. Grigat, A. Higuera, C. Hils, L. Hoetzsch, J. Howlett, C. Huhmann, M. Iacovacci, Y. Itow, J. Jakob, F. Joerg, A. Joy, N. Kato, P. Kavrigin, S. Kazama, M. Kobayashi, G. Koltman, A. Kopec, H. Landsman, R. F. Lang, L. Levinson, S. Li, I. Li, S. Liang, S. Lindemann, M. Lindner, K. Liu, F. Lombardi, J. Long, J. A.M. Lopes, Y. Ma, C. Macolino, J. Mahlstedt, A. Mancuso, L. Manenti, A. Manfredini, F. Marignetti, T. Marrodán Undagoitia, K. Martens, J. Masbou, D. Masson, E. Masson, S. Mastroianni, M. Messina, K. Miuchi, K. Mizukoshi, A. Molinario, S. Moriyama, K. Morå, Y. Mosbacher, M. Murra, J. Müller

    Progress of Theoretical and Experimental Physics   Vol. 2022 ( 5 )   2022.5

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    DOI: 10.1093/ptep/ptac074

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  32. Search for exotic neutrino interactions by XMASS-I detector International coauthorship International journal

    Hiroshi Ogawa, K. Abe, Y. Chen, K. Hiraide, S. Imaizumi, N. Kato, S. Moriyama, M. Nakahata, K. Sato, H. Sekiya, T. Suzuki, Y. Suzuki, A. Takeda, S. Tasaka, B. S. Yang, N. Y. Kim, Y. D. Kim, Y. H. Kim, Y. Itow, K. Martens, A. Mason, M. Yamashita, K. Miuchi, Y. Takeuchi, K. B. Lee, M. K. Lee, Y. Fukuda, Hiroshi Ogawa, K. Ichimura, Y. Kishimoto, K. Nishijima, K. Fushimi, B. D. Xu, K. Kobayashi, S. Nakamura

    Proceedings of Science   Vol. 395   2022.3

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  33. Development of a cavity with photonic crystal structure for axion searches International coauthorship International journal Open Access

    Y. Kishimoto, Y. Suzuki, I. Ogawa, Y. Mori, M. Yamashita

    Progress of Theoretical and Experimental Physics   Vol. 2021 ( 6 )   2021.6

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    DOI: 10.1093/ptep/ptab051

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  34. Search for event bursts in XMASS-I associated with gravitational-wave events International coauthorship International journal

    K. Abe, K. Hiraide, K. Ichimura, Y. Kishimoto, K. Kobayashi, M. Kobayashi, S. Moriyama, M. Nakahata, H. Ogawa, K. Sato, H. Sekiya, T. Suzuki, A. Takeda, S. Tasaka, M. Yamashita, B. S. Yang, N. Y. Kim, Y. D. Kim, Y. Itow, K. Kanzawa, K. Masuda, K. Martens, Y. Suzuki, B. D. Xu, K. Miuchi, N. Oka, Y. Takeuchi, Y. H. Kim, K. B. Lee, M. K. Lee, Y. Fukuda, M. Miyasaka, K. Nishijima, K. Fushimi, G. Kanzaki, S. Nakamura

    Astroparticle Physics   Vol. 129   2021.5

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    DOI: 10.1016/j.astropartphys.2021.102568

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  35. <sup>222</sup> Rn emanation measurements for the XENON1T experiment International coauthorship International journal Open Access

    E. Aprile, J. Aalbers, F. Agostini, M. Alfonsi, L. Althueser, F. D. Amaro, V. C. Antochi, E. Angelino, J. R. Angevaare, F. Arneodo, D. Barge, L. Baudis, B. Bauermeister, L. Bellagamba, M. L. Benabderrahmane, T. Berger, P. A. Breur, A. Brown, E. Brown, S. Bruenner, G. Bruno, R. Budnik, C. Capelli, J. M.R. Cardoso, D. Cichon, B. Cimmino, M. Clark, D. Coderre, A. P. Colijn, J. Conrad, J. P. Cussonneau, M. P. Decowski, A. Depoian, P. Di Gangi, A. Di Giovanni, R. Di Stefano, S. Diglio, A. Elykov, G. Eurin, A. D. Ferella, W. Fulgione, P. Gaemers, R. Gaior, A. Gallo Rosso, M. Galloway, F. Gao, L. Grandi, M. Garbini, C. Hasterok, C. Hils, K. Hiraide, L. Hoetzsch, E. Hogenbirk, J. Howlett, M. Iacovacci, Y. Itow, F. Joerg, N. Kato, S. Kazama, M. Kobayashi, G. Koltman, A. Kopec, H. Landsman, R. F. Lang, L. Levinson, Q. Lin, S. Lindemann, M. Lindner, F. Lombardi, J. A.M. Lopes, E. López Fune, C. Macolino, J. Mahlstedt, L. Manenti, A. Manfredini, F. Marignetti, T. Marrodán Undagoitia, K. Martens, J. Masbou, D. Masson, S. Mastroianni, M. Messina, K. Miuchi, A. Molinario, K. Morå, S. Moriyama, Y. Mosbacher, M. Murra, J. Naganoma, K. Ni, U. Oberlack, K. Odgers, J. Palacio, B. Pelssers, R. Peres, J. Pienaar, V. Pizzella, G. Plante, J. Qin, H. Qiu

    European Physical Journal C   Vol. 81 ( 4 ) page: 337   2021.4

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    DOI: 10.1140/epjc/s10052-020-08777-z

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  36. Search for inelastic scattering of WIMP dark matter in XENON1T International coauthorship International journal Open Access

    E. Aprile, J. Aalbers, F. Agostini, M. Alfonsi, L. Althueser, F. D. Amaro, S. Andaloro, E. Angelino, J. R. Angevaare, V. C. Antochi, F. Arneodo, L. Baudis, B. Bauermeister, L. Bellagamba, M. L. Benabderrahmane, A. Brown, E. Brown, S. Bruenner, G. Bruno, R. Budnik, C. Capelli, J. M.R. Cardoso, D. Cichon, B. Cimmino, M. Clark, D. Coderre, A. P. Colijn, J. Conrad, J. Cuenca, J. P. Cussonneau, M. P. Decowski, A. Depoian, P. Di Gangi, A. Di Giovanni, R. Di Stefano, S. Diglio, A. Elykov, A. D. Ferella, W. Fulgione, P. Gaemers, R. Gaior, M. Galloway, F. Gao, L. Grandi, C. Hils, K. Hiraide, L. Hoetzsch, J. Howlett, M. Iacovacci, Y. Itow, F. Joerg, N. Kato, S. Kazama, M. Kobayashi, G. Koltman, A. Kopec, H. Landsman, R. F. Lang, L. Levinson, S. Liang, Q. Lin, S. Lindemann, M. Lindner, F. Lombardi, J. Long, J. A.M. Lopes, Y. Ma, C. Macolino, J. Mahlstedt, A. Mancuso, L. Manenti, A. Manfredini, F. Marignetti, T. Marrodan Undagoitia, K. Martens, J. Masbou, D. Masson, S. Mastroianni, M. Messina, K. Miuchi, K. Mizukoshi, A. Molinario, K. Morå, S. Moriyama, Y. Mosbacher, M. Murra, J. Naganoma, K. Ni, U. Oberlack, K. Odgers, J. Palacio, B. Pelssers, R. Peres, J. Pienaar, M. Pierre, V. Pizzella, G. Plante, J. Qi, J. Qin, D. Ramírez Garciá

    Physical Review D   Vol. 103 ( 6 )   2021.3

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    DOI: 10.1103/PhysRevD.103.063028

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  37. Search for Coherent Elastic Scattering of Solar B 8 Neutrinos in the XENON1T Dark Matter Experiment International coauthorship International journal Open Access

    E. Aprile, J. Aalbers, F. Agostini, S. Ahmed Maouloud, M. Alfonsi, L. Althueser, F. D. Amaro, S. Andaloro, V. C. Antochi, E. Angelino, J. R. Angevaare, F. Arneodo, L. Baudis, B. Bauermeister, L. Bellagamba, M. L. Benabderrahmane, A. Brown, E. Brown, S. Bruenner, G. Bruno, R. Budnik, C. Capelli, J. M.R. Cardoso, D. Cichon, B. Cimmino, M. Clark, D. Coderre, A. P. Colijn, J. Conrad, J. Cuenca, J. P. Cussonneau, M. P. Decowski, A. Depoian, P. Di Gangi, A. Di Giovanni, R. Di Stefano, S. Diglio, A. Elykov, A. D. Ferella, W. Fulgione, P. Gaemers, R. Gaior, M. Galloway, F. Gao, L. Grandi, C. Hils, K. Hiraide, L. Hoetzsch, J. Howlett, M. Iacovacci, Y. Itow, F. Joerg, N. Kato, S. Kazama, M. Kobayashi, G. Koltman, A. Kopec, H. Landsman, R. F. Lang, L. Levinson, S. Liang, S. Lindemann, M. Lindner, F. Lombardi, J. Long, J. A.M. Lopes, Y. Ma, C. Macolino, J. Mahlstedt, A. Mancuso, L. Manenti, A. Manfredini, F. Marignetti, T. Marrodán Undagoitia, K. Martens, J. Masbou, D. Masson, S. Mastroianni, M. Messina, K. Miuchi, K. Mizukoshi, A. Molinario, K. Morå, S. Moriyama, Y. Mosbacher, M. Murra, J. Naganoma, K. Ni, U. Oberlack, K. Odgers, J. Palacio, B. Pelssers, R. Peres, M. Pierre, J. Pienaar, V. Pizzella, G. Plante, J. Qi, J. Qin, D. Ramírez García

    Physical Review Letters   Vol. 126 ( 9 ) page: 091301   2021.3

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  38. Characterization of new silicon photomultipliers with low dark noise at low temperature International coauthorship International journal Open Access

    K. Ozaki, S. Kazama, M. Yamashita, Y. Itow, S. Moriyama

    Journal of Instrumentation   Vol. 16 ( 3 )   2021.3

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    DOI: 10.1088/1748-0221/16/03/P03014

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  39. Development of a dual-phase xenon TPC with a quartz chamber for direct dark matter searches International coauthorship International journal Open Access

    Kazufumi Sato, Masaki Yamashita, Koichi Ichimura, Yoshitaka Itow, Shingo Kazama, Shigetaka Moriyama, Kosuke Ozaki, Takumi Suzuki, Rina Yamazaki

    Progress of Theoretical and Experimental Physics   Vol. 2020 ( 11 )   2020.11

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    DOI: 10.1093/ptep/ptaa141

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    Other Link: http://academic.oup.com/ptep/article-pdf/2020/11/113H02/34299924/ptaa141.pdf

  40. Projected WIMP sensitivity of the XENONnT dark matter experiment International coauthorship International journal Open Access

    E. Aprile, J. Aalbers, F. Agostini, M. Alfonsi, L. Althueser, F. D. Amaro, V. C. Antochi, E. Angelino, J. R. Angevaare, F. Arneodo, D. Barge, L. Baudis, B. Bauermeister, L. Bellagamba, M. L. Benabderrahmane, T. Berger, A. Brown, E. Brown, S. Bruenner, G. Bruno, R. Budnik, C. Capelli, J. M.R. Cardoso, D. Cichon, B. Cimmino, M. Clark, D. Coderre, A. P. Colijn, J. Conrad, J. P. Cussonneau, M. P. Decowski, A. Depoian, P. Di Gangi, A. Di Giovanni, R. Di Stefano, S. Diglio, A. Elykov, G. Eurin, A. D. Ferella, W. Fulgione, P. Gaemers, R. Gaior, M. Galloway, F. Gao, L. Grandi, C. Hasterok, C. Hils, K. Hiraide, L. Hoetzsch, J. Howlett, M. Iacovacci, Y. Itow, F. Joerg, N. Kato, S. Kazama, M. Kobayashi, G. Koltman, A. Kopec, H. Landsman, R. F. Lang, L. Levinson, Q. Lin, S. Lindemann, M. Lindner, F. Lombardi, J. Long, J. A.M. Lopes, E. López Fune, C. MacOlino, J. Mahlstedt, A. Mancuso, L. Manenti, A. Manfredini, F. Marignetti, T. Marrodán Undagoitia, K. Martens, J. Masbou, D. Masson, S. Mastroianni, M. Messina, K. Miuchi, K. Mizukoshi, A. Molinario, K. Morå, S. Moriyama, Y. Mosbacher, M. Murra, J. Naganoma, K. Ni, U. Oberlack, K. Odgers, J. Palacio, B. Pelssers, R. Peres, J. Pienaar, V. Pizzella, G. Plante, J. Qin, H. Qiu, D. Ramírez García

    Journal of Cosmology and Astroparticle Physics   Vol. 2020 ( 11 )   2020.11

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    DOI: 10.1088/1475-7516/2020/11/031

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  41. Excess electronic recoil events in XENON1T International coauthorship International journal Open Access

    E. Aprile, J. Aalbers, F. Agostini, M. Alfonsi, L. Althueser, F. D. Amaro, V. C. Antochi, E. Angelino, J. R. Angevaare, F. Arneodo, D. Barge, L. Baudis, B. Bauermeister, L. Bellagamba, M. L. Benabderrahmane, T. Berger, A. Brown, E. Brown, S. Bruenner, G. Bruno, R. Budnik, C. Capelli, J. M.R. Cardoso, D. Cichon, B. Cimmino, M. Clark, D. Coderre, A. P. Colijn, J. Conrad, J. P. Cussonneau, M. P. Decowski, A. Depoian, P. Di Gangi, A. Di Giovanni, R. Di Stefano, S. Diglio, A. Elykov, G. Eurin, A. D. Ferella, W. Fulgione, P. Gaemers, R. Gaior, M. Galloway, F. Gao, L. Grandi, C. Hasterok, C. Hils, K. Hiraide, L. Hoetzsch, J. Howlett, M. Iacovacci, Y. Itow, F. Joerg, N. Kato, S. Kazama, M. Kobayashi, G. Koltman, A. Kopec, H. Landsman, R. F. Lang, L. Levinson, Q. Lin, S. Lindemann, M. Lindner, F. Lombardi, J. Long, J. A.M. Lopes, E. López Fune, C. Macolino, J. Mahlstedt, A. Mancuso, L. Manenti, A. Manfredini, F. Marignetti, T. Marrodán Undagoitia, K. Martens, J. Masbou, D. Masson, S. Mastroianni, M. Messina, K. Miuchi, K. Mizukoshi, A. Molinario, K. Morå, S. Moriyama, Y. Mosbacher, M. Murra, J. Naganoma, K. Ni, U. Oberlack, K. Odgers, J. Palacio, B. Pelssers, R. Peres, J. Pienaar, V. Pizzella, G. Plante, J. Qin, H. Qiu, D. Ramírez García

    Physical Review D   Vol. 102 ( 7 )   2020.10

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    DOI: 10.1103/PhysRevD.102.072004

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  42. Search for exotic neutrino-electron interactions using solar neutrinos in XMASS-I International coauthorship International journal Open Access

    K. Abe, Y. Chen, K. Hiraide, K. Ichimura, S. Imaizumi, N. Kato, K. Kobayashi, M. Kobayashi, S. Moriyama, M. Nakahata, K. Sato, H. Sekiya, T. Suzuki, A. Takeda, S. Tasaka, M. Yamashita, B. S. Yang, N. Y. Kim, Y. D. Kim, Y. H. Kim, R. Ishii, Y. Itow, K. Kanzawa, K. Martens, A. Mason, Y. Suzuki, K. Miuchi, Y. Takeuchi, K. B. Lee, M. K. Lee, Y. Fukuda, H. Ogawa, Y. Kishimoto, K. Nishijima, K. Fushimi, B. D. Xu, S. Nakamura

    Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics   Vol. 809   2020.10

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    DOI: 10.1016/j.physletb.2020.135741

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  43. Development of low-background photomultiplier tubes for liquid xenon detectors International coauthorship International journal Open Access

    K. Abe, Y. Chen, K. Hiraide, K. Ichimura, S. Imaizumi, N. Kato, Y. Kishimoto, K. Kobayashi, M. Kobayashi, S. Moriyama, M. Nakahata, K. Sato, H. Sekiya, T. Suzuki, A. Takeda, S. Tasaka, M. Yamashita, B. S. Yang, N. Y. Kim, Y. D. Kim, Y. H. Kim, R. Ishii, Y. Itow, K. Kanzawa, K. Masuda, K. Martens, A. Mason, Y. Suzuki, K. Miuchi, Y. Takeuchi, K. B. Lee, M. K. Lee, Y. Fukuda, H. Ogawa, K. Nishijima, K. Fushimi, B. D. Xu, S. Nakamura

    Journal of Instrumentation   Vol. 15 ( 9 )   2020.9

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    DOI: 10.1088/1748-0221/15/09/P09027

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  44. Energy resolution and linearity of XENON1T in the MeV energy range International coauthorship International journal Open Access

    E. Aprile, J. Aalbers, F. Agostini, M. Alfonsi, L. Althueser, F. D. Amaro, V. C. Antochi, E. Angelino, J. Angevaare, F. Arneodo, D. Barge, L. Baudis, B. Bauermeister, L. Bellagamba, M. L. Benabderrahmane, T. Berger, P. A. Breur, A. Brown, E. Brown, S. Bruenner, G. Bruno, R. Budnik, C. Capelli, J. M.R. Cardoso, D. Cichon, B. Cimmino, M. Clark, D. Coderre, A. P. Colijn, J. Conrad, J. P. Cussonneau, M. P. Decowski, A. Depoian, P. Di Gangi, A. Di Giovanni, R. Di Stefano, S. Diglio, A. Elykov, G. Eurin, A. D. Ferella, W. Fulgione, P. Gaemers, R. Gaior, A. Gallo Rosso, M. Galloway, F. Gao, M. Garbini, L. Grandi, C. Hasterok, C. Hils, K. Hiraide, L. Hoetzsch, E. Hogenbirk, J. Howlett, M. Iacovacci, Y. Itow, F. Joerg, N. Kato, S. Kazama, M. Kobayashi, G. Koltman, A. Kopec, H. Landsman, R. F. Lang, L. Levinson, Q. Lin, S. Lindemann, M. Lindner, F. Lombardi, J. A.M. Lopes, E. López Fune, C. Macolino, J. Mahlstedt, L. Manenti, A. Manfredini, F. Marignetti, T. Marrodán Undagoitia, K. Martens, J. Masbou, D. Masson, S. Mastroianni, M. Messina, K. Miuchi, A. Molinario, K. Morå, S. Moriyama, Y. Mosbacher, M. Murra, J. Naganoma, K. Ni, U. Oberlack, K. Odgers, J. Palacio, B. Pelssers, R. Peres, J. Pienaar, V. Pizzella, G. Plante, J. Qin, H. Qiu

    European Physical Journal C   Vol. 80 ( 8 )   2020.8

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    DOI: 10.1140/epjc/s10052-020-8284-0

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  45. Annual modulation search by XMASS-I with 2.7 years of data International coauthorship International journal

    Masaki Yamashita

    Journal of Physics: Conference Series   Vol. 1342 ( 1 )   2020.1

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    DOI: 10.1088/1742-6596/1342/1/012083

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  46. Search for sub-GeV dark matter by annual modulation using XMASS-I detector XMASS Collaboration International coauthorship International journal Open Access

    Kobayashi M, Abe K, Hiraide K, Ichimura K, Kishimoto Y, Kobayashi K, Moriyama S, Nakahata M, Ogawa H, Sato K, Sekiya H, Suzuki T, Takeda A, Tasaka S, Yamashita M, Yang B. S, Kim N. Y, Kim Y. D, Itow Y, Kanzawa K, Masuda K, Martens K, Suzuki Y, Xu B. D, Miuchi K, Oka N, Takeuchi Y, Kim Y. H, Lee K. B, Lee M. K, Fukuda Y, Miyasaka M, Nishijima K, Fushimi K, Kanzaki G, Nakamura S

    PHYSICS LETTERS B   Vol. 795   page: 308 - 313   2019.8

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    DOI: 10.1016/j.physletb.2019.06.022

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  47. Search for WIMP-Xe-129 inelastic scattering with particle identification in XMASS-I International coauthorship International journal Open Access

    Suzuki T, Abe K, Hiraide K, Ichimura K, Kishimoto Y, Kobayashi K, Kobayashi M, Moriyama S, Nakahata M, Ogawa H, Sato K, Sekiya H, Takeda A, Tasaka S, Yamashita M, Yang B. S, Kim N. Y, Kim Y. D, Itow Y, Kanzawa K, Masuda K, Martens K, Suzuki Y, Xu B. D, Miuchi K, Oka N, Takeuchi Y, Kim Y. H, Lee K. B, Lee M. K, Fukuda Y, Miyasaka M, Nishijima K, Fushimi K, Kanzaki G, Nakamura S

    ASTROPARTICLE PHYSICS   Vol. 110   page: 1-7 - 7   2019.7

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    DOI: 10.1016/j.astropartphys.2019.02.007

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  48. Development of low radioactivity photomultiplier tubes for the XMASS-I detector International coauthorship International journal Open Access

    Abe K, Hiraide K, Ichimura K, Kishimoto Y, Kobayashi K, Kobayash M, Moriyama S, Nakahatan M, Norit T, Ogawa H, Sato K, Sekiya H, Takachio O, Takeda A, Tasak S, Yamashita M, Yang B. S, Kim N. Y, Kim Y. D, Itow Y, Kanzawa K, Kegasa R, Masuda K, Takiya H, Fushimi K, Kanzaki G, Martens K, Suzuki Y, Xu B. D, Fujita R, Hosokawa K, Miuchi K, Oka N, Takeuchi Y, Kim Y. H, Lee K. B, Lee M. K, Fukuda Y, Miyasaka M, Nishijima K, Nakamura S

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 922   page: 171-176 - 176   2019.4

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    DOI: 10.1016/j.nima.2018.12.083

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  49. A direct dark matter search in XMASS-I International coauthorship International journal Open Access

    Abe K, Hiraide K, Ichimura K, Kishimoto Y, Kobayashi K, Kobayashi M, Moriyama S, Nakahata M, Norita T, Ogawa H, Sato K, Sekiya H, Takachio O, Takeda A, Tasaka S, Yamashita M, Yang B. S, Kim N. Y, Kim Y. D, Itow Y, Kanzawa K, Kegasa R, Masuda K, Takiya H, Fushimi K, Kanzaki G, Martens K, Suzuki Y, Xu B. D, Fujita R, Hosokawa K, Miuchi K, Oka N, Takeuchi Y, Kim Y. H, Lee K. B, Lee M. K, Fukuda Y, Miyasaka M, Nishijima K, Nakamura S

    PHYSICS LETTERS B   Vol. 789   page: 45-53 - 53   2019.2

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    DOI: 10.1016/j.physletb.2018.10.070

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  50. Search for dark matter in the form of hidden photons and axion-like particles in the XMASS detector International coauthorship International journal Open Access

    K. Abe, K. Abe, K. Hiraide, K. Hiraide, K. Ichimura, K. Ichimura, Y. Kishimoto, Y. Kishimoto, K. Kobayashi, K. Kobayashi, M. Kobayashi, S. Moriyama, S. Moriyama, M. Nakahata, M. Nakahata, H. Ogawa, H. Ogawa, H. Ogawa, K. Sato, H. Sekiya, H. Sekiya, T. Suzuki, O. Takachio, A. Takeda, A. Takeda, S. Tasaka, M. Yamashita, M. Yamashita, B. S. Yang, B. S. Yang, B. S. Yang, N. Y. Kim, Y. D. Kim, Y. Itow, Y. Itow, K. Kanzawa, K. Masuda, K. Martens, Y. Suzuki, B. D. Xu, K. Miuchi, N. Oka, Y. Takeuchi, Y. Takeuchi, Y. H. Kim, Y. H. Kim, K. B. Lee, M. K. Lee, Y. Fukuda, M. Miyasaka, K. Nishijima, K. Fushimi, G. Kanzaki, S. Nakamura

    Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics   Vol. 787   page: 153 - 158   2018.12

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    DOI: 10.1016/j.physletb.2018.10.050

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  51. A measurement of the scintillation decay time constant of nuclear recoils in liquid xenon with the XMASS-I detector International coauthorship International journal Open Access

    Abe K, Hiraide K, Ichimura K, Kishimoto Y, Kobayashi K, Kobayashi M, Moriyama S, Nakahata M, Ogawa H, Sato K, Sekiya H, Suzuki T, Takachio O, Takeda A, Tasaka S, Yamashita M, Yang B. S, Kim N. Y, Kim Y. D, Itow Y, Kanzawa K, Masuda K, Martens K, Suzuki Y, Xu B. D, Miuchi K, Oka N, Takeuchi Y, Kim Y. H, Lee K. B, Lee M. K, Fukuda Y, Miyasaka M, Nishijima K, Fushimi K, Kanzaki G, Nakamura S

    JOURNAL OF INSTRUMENTATION   Vol. 13 ( 12 )   2018.12

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    DOI: 10.1088/1748-0221/13/12/P12032

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  52. Direct dark matter search by annual modulation with 2.7 years of XMASS-I data Reviewed International coauthorship International journal Open Access

    K.Abe, K.Hiraide, K.Ichimura, Y.Kishimoto, K.Kobayashi, M.Kobayashi, S.Moriyama, M.Nakahata, T.Norita, H.Ogawa, K.Sato, H.Sekiya, O.Takachio, A.Takeda, S.Tasaka, M.Yamashita, B.S.Yang, N.Y.Kim, Y.D.Kim, Y.Itow, K.Kanzawa, R.Kegasa, K.Masuda, H.Takiya, K.Fushimi, G.Kanzaki, K.Martens, Y.Suzuki, B.D.Xu, R.Fujita, K.Hosokawa, K.Miuchi, N.Oka, Y.Takeuchi, Y.H.Kim, K.B.Lee, M.K.Lee, Y.Fukuda, M.Miyasaka, K.Nishijima, S.Nakamura, MASS Collaboration

    Physical Review D   Vol. 97 ( 10 ) page: 102006   2018.5

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    An annual modulation signal due to the Earth orbiting around the Sun would be one of the strongest indications of the direct detection of dark matter. In 2016, we reported a search for dark matter by looking for this annual modulation with our single-phase liquid xenon XMASS-I detector. That analysis resulted in a slightly negative modulation amplitude at low energy. In this work, we included more than one year of additional data, which more than doubles the exposure to 800 live days with the same 832 kg target mass. When we assume weakly interacting massive particle (WIMP) dark matter elastically scattering on the xenon target, the exclusion upper limit for the WIMP-nucleon cross section was improved by a factor of 2 to 1.9×10-41 cm2 at 8 GeV/c2 at 90% confidence level with our newly implemented data selection through a likelihood method. For the model-independent case, without assuming any specific dark matter model, we obtained more consistency with the null hypothesis than before with a p-value of 0.11 in the 1-20 keV energy region. This search probed this region with an exposure that was larger than that of DAMA/LIBRA. We also did not find any significant amplitude in the data for periodicity with periods between 50 and 600 days in the energy region between 1 to 6 keV.

    DOI: 10.1103/PhysRevD.97.102006

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  53. Improved search for two-neutrino double electron capture on Xe-124 and Xe-126 using particle identification in XMASS-I

    Abe K, Hiraide K, Ichimura K, Kishimoto Y, Kobayashi K, Kobayashi M, Moriyama S, Nakahata M, Norita T, Ogawa H, Sato K, Sekiya H, Takachio O, Takeda A, Tasaka S, Yamashita M, Yang B. S, Kim N. Y, Kim Y. D, Itow Y, Kanzawa K, Kegasa R, Masuda K, Takiya H, Fushimi K, Kanzaki G, Martens K, Suzuki Y, Xu B. D, Fujita R, Hosokawa K, Miuchi K, Oka N, Takeuchi Y, Kim Y. H, Lee K. B, Lee M. K, Fukuda Y, Miyasaka M, Nishijima K, Nakamura S

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS   Vol. 2018 ( 5 )   2018.5

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    DOI: 10.1093/ptep/pty053

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  54. Identification of 210Pb and 210Po in the bulk of copper samples with a low-background alpha particle counter International coauthorship International journal Open Access

    K. Abe, K. Hiraide, K. Ichimura, Y. Kishimoto, K. Kobayashi, M. Kobayashi, S. Moriyama, M. Nakahata, T. Norita, H. Ogawa, K. Sato, H. Sekiya, O. Takachio, A. Takeda, S. Tasaka, M. Yamashita, B. S. Yang, N. Y. Kim, Y. D. Kim, Y. Itow, K. Kanzawa, R. Kegasa, K. Masuda, H. Takiya, K. Fushimi, G. Kanzaki, K. Martens, Y. Suzuki, B. D. Xu, R. Fujita, K. Hosokawa, K. Miuchi, N. Oka, Y. Takeuchi, Y. H. Kim, K. B. Lee, M. K. Lee, Y. Fukuda, M. Miyasaka, K. Nishijima, S. Nakamura

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   Vol. 884   page: 157 - 161   2018.3

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    We established a method to assay 210Pb and 210Po contaminations in the bulk of copper samples using a low-background alpha particle counter. The achieved sensitivity for the 210Pb and 210Po contaminations reaches a few mBq/kg. Due to this high sensitivity, the 210Pb and 210Po contaminations in oxygen free copper bulk were identified and measured for the first time. The 210Pb contaminations of our oxygen free copper samples were 17–40 mBq/kg. Based on our investigation of copper samples in each production step, the 210Pb in oxygen free copper was understood to be a small residual of an electrolysis process. This method to measure bulk contaminations of 210Pb and 210Po could be applied to other materials.

    DOI: 10.1016/j.nima.2017.12.015

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  55. Search for solar Kaluza-Klein axions by annual modulation with the XMASS-I detector Reviewed International coauthorship International journal Open Access

    N. Oka, K. Abe, K. Hiraide, K. Ichimura, Y. Kishimoto, K. Kobayashi, M. Kobayashi, S. Moriyama, M. Nakahata, T. Norita, H. Ogawa, K. Sato, H. Sekiya, O. Takachio, A. Takeda, S. Tasaka, M. Yamashita, B. S. Yang, N. Y. Kim, Y. D. Kim, Y. Itow, K. Kanzawa, R. Kegasa, K. Masuda, H. Takiya, K. Fushimi, G. Kanzaki, K. Martens, Y. Suzuki, B. D. Xu, R. Fujita, K. Hosokawa, K. Miuchi, Y. Takeuchi, Y. H. Kim, K. B. Lee, M. K. Lee, Y. Fukuda, M. Miyasaka, K. Nishijima, S. Nakamura

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS   Vol. 2017 ( 10 ) page: 103C01   2017.10

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    DOI: 10.1093/ptep/ptx137

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  56. Detectability of galactic supernova neutrinos coherently scattered on xenon nuclei in XMASS

    K. Abe, K. Hiraide, K. Ichimura, Y. Kishimoto, K. Kobayashi, M. Kobayashi, S. Moriyama, K. Nakagawa, M. Nakahata, T. Norita, H. Ogawa, H. Sekiya, O. Takachio, A. Takeda, M. Yamashita, B. S. Yang, N. Y. Kim, Y. D. Kim, S. Tasaka, J. Liu, K. Martens, Y. Suzuki, R. Fujita, K. Hosokawa, K. Miuchi, N. Oka, Y. Onishi, Y. Takeuchi, Y. H. Kim, J. S. Lee, K. B. Lee, M. K. Lee, Y. Fukuda, Y. Itow, R. Kegasa, K. Kobayashi, K. Masuda, H. Takiya, H. Uchida, K. Nishijima, K. Fujii, I. Murayama, S. Nakamura

    ASTROPARTICLE PHYSICS   Vol. 89   page: 51 - 56   2017.3

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    The coherent elastic neutrino-nucleus scattering (CEvNS) plays a crucial role at the final evolution of stars. The detection of it would be of importance in astroparticle physics. Among all available neutrino sources, galactic supernovae give the highest neutrino flux in the MeV range. Among all liquid xenon dark matter experiments, XMASS has the largest sensitive volume and light yield. The possibility to detect galactic supernova via the CEvNS-process on xenon nuclei in the current XMASS detector was investigated. The total number of events integrated in about 18 s after the explosion of a supernova 10 kpc away from the Earth was expected to be from 3.5 to 21.1, depending on the supernova model used to predict the neutrino flux, while the number of background events in the same time window was measured to be negligible. All lead to very high possibility to detect CEvNS experimentally for the first time utilizing the combination of galactic supernovae and the XMASS detector. In case of a supernova explosion as close as Betelgeuse, the total observable events can be more than similar to 10(4), making it possible to distinguish different supernova models by examining the evolution of neutrino event rate in XMASS. (C) 2017 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.astropartphys.2017.01.006

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  57. A measurement of the time profile of scintillation induced by low energy gamma-rays in liquid xenon with the XMASS-I detector International coauthorship International journal Open Access

    H. Takiya, K. Abe, K. Hiraide, K. Ichimura, Y. Kishimoto, K. Kobayashi, M. Kobayashi, S. Moriyama, M. Nakahata, T. Norita, H. Ogawa, H. Sekiya, O. Takachio, A. Takeda, S. Tasaka, M. Yamashita, B. S. Yang, N. Y. Kim, Y. D. Kim, Y. Itow, R. Kegasa, K. Kobayashi, K. Masuda, K. Fushimi, K. Martens, Y. Suzuki, R. Fujita, K. Hosokawa, K. Miuchi, N. Oka, Y. Onishi, Y. Takeuchi, Y. H. Kim, J. S. Lee, K. B. Lee, M. K. Lee, Y. Fukuda, K. Nishijima, S. Nakamura

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 834   page: 192 - 196   2016.10

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    We report the measurement of the emission time profile of scintillation from gamma-ray induced events in the XMASS-I 832 kg liquid xenon scintillation detector. Decay time constant was derived from a comparison of scintillation photon timing distributions between the observed data and simulated samples in order to take into account optical processes such as absorption and scattering in liquid xenon. Calibration data of radioactive sources, Be-55, Am-241, and Co-57 were used to obtain the decay time constant. Assuming two decay components, tau(1) and tau(2), the decay time constant tau(2) increased from 27.9 ns to 37.0 ns as the gamma-ray energy increased from 5.9 keV to 122 keV. The accuracy of the measurement was better than 1.5 ns at all energy levels. A fast decay component with tau(1) similar to 2 ns was necessary to reproduce data. Energy dependencies of tau(2) and the fraction of the fast decay component were studied as a function of the kinetic energy of electrons induced by gamma-rays. The obtained data almost reproduced previously reported results and extended them to the lower energy region relevant to direct dark matter searches. (C) 2016 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.nima.2016.08.014

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  58. Light yield of an undoped CsI crystal coupled directly to a photomultiplier tube at 77 Kelvin International coauthorship International journal

    J. Liu, M. Yamashita, A. K. Soma

    JOURNAL OF INSTRUMENTATION   Vol. 11 ( 10 )   2016.10

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    A light yield of 20.4 +/- 0.8 photoelectrons/keV was achieved with an undoped CsI crystal coupled directly to a photomultiplier tube at 77 Kelvin. This is by far the largest yield in the world achieved with CsI crystals. An energy threshold that is several times lower than the current dark matter experiments utilizing CsI(Tl) crystals may be achievable using this technique. Together with novel CsI crystal purification methods, the technique may be used to improve the sensitivities of dark matter and coherent elastic neutrino-nucleus scattering experiments. Also measured were the scintillation light decay constants of the undoped CsI crystal at both room temperature and 77 Kelvin. The results are consistent with those in the literature.

    DOI: 10.1088/1748-0221/11/10/P10003

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  59. Search for two-neutrino double electron capture on Xe-124 with the XMASS-I detector International coauthorship International journal

    K. Abe, K. Hiraide, K. Ichimura, Y. Kishimoto, K. Kobayashi, M. Kobayashi, S. Moriyama, K. Nakagawa, M. Nakahata, T. Norita, H. Ogawa, H. Sekiya, O. Takachio, A. Takeda, M. Yamashita, B. S. Yang, N. Y. Kim, Y. D. Kim, S. Tasaka, J. Liu, K. Martens, Y. Suzuki, R. Fujita, K. Hosokawa, K. Miuchi, N. Oka, Y. Onishi, Y. Takeuchi, Y. H. Kim, J. S. Lee, K. B. Lee, M. K. Lee, Y. Fukuda, Y. Itow, R. Kegasa, K. Kobayashi, K. Masuda, H. Takiya, H. Uchida, K. Nishijima, K. Fujii, I. Murayama, S. Nakamura

    PHYSICS LETTERS B   Vol. 759   page: 64 - 68   2016.8

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    DOI: 10.1016/j.physletb.2016.05.039

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  60. Direct dark matter search by annual modulation in XMASS-I International coauthorship International journal

    K. Abe, K. Hiraide, K. Ichimura, Y. Kishimoto, K. Kobayashi, M. Kobayashi, S. Moriyama, M. Nakahata, T. Norita, H. Ogawa, H. Sekiya, O. Takachio, A. Takeda, M. Yamashita, B. S. Yang, N. Y. Kim, Y. D. Kim, S. Tasaka, K. Fushimi, J. Liu, K. Martens, Y. Suzuki, B. D. Xu, R. Fujita, K. Hosokawa, K. Miuchi, Y. Onishi, N. Oka, Y. Takeuchi, Y. H. Kim, J. S. Lee, K. B. Lee, M. K. Lee, Y. Fukuda, Y. Itow, R. Kegasa, K. Kobayashi, K. Masuda, H. Takiya, K. Nishijima, S. Nakamura

    PHYSICS LETTERS B   Vol. 759   page: 272 - 276   2016.8

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    A search for dark matter was conducted by looking for an annual modulation signal due to the Earth's rotation around the Sun using XMASS, a single phase liquid xenon detector. The data used for this analysis was 359.2 live days times 832 kg of exposure accumulated between November 2013 and March 2015. When we assume Weakly Interacting Massive Particle ( WIMP) dark matter elastically scattering on the target nuclei, the exclusion upper limit of the WIMP-nucleon cross section 4.3 x 10(-41) cm(2) at 8 GeV/c(2) was obtained and we exclude almost all the DAMA/LIBRA allowed region in the 6 to 16 GeV/c(2) range at similar to 10(-40) cm(2). The result of a simple modulation analysis, without assuming any specific dark matter model but including electron/gamma events, showed a slight negative amplitude. The p-values obtained with two independent analyses are 0.014 and 0.068 for null hypothesis, respectively. We obtained 90% C.L. upper bounds that can be used to test various models. This is the first extensive annual modulation search probing this region with an exposure comparable to DAMA/LIBRA. (C) 2016 The Author(s). Published by Elsevier B.V.

    DOI: 10.1016/j.physletb.2016.05.081

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  61. Using Rn-220 to calibrate liquid noble gas detectors International coauthorship International journal

    M. Kobayashi, M. Yamashita, A. Takeda, K. Kishimoto, S. Moriyama

    XIV INTERNATIONAL CONFERENCE ON TOPICS IN ASTROPARTICLE AND UNDERGROUND PHYSICS (TAUP 2015), PTS 1-7   Vol. 718   2016

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    DOI: 10.1088/1742-6596/718/4/042069

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  62. Micro-source development for XMASS experiment International coauthorship International journal

    N. Y. Kim, K. Abe, K. Hieda, K. Hiraid, S. Hirano, Y. Kishimoto, K. Kobayashi, S. Moriyama, K. Nakagawa, M. Nakahata, H. Nishiie, H. Ogawa, N. Oka, H. Sekiya, A. Shinozaki, Y. Suzuki, A. Takeda, O. Takachio, K. Ueshima, D. Umemoto, M. Yamashita, B. S. Yang, S. Tasaka, J. Liu, K. Martens, K. Hosokawa, K. Miuchi, A. Murata, Y. Onishi, Y. Otsuka, Y. Takeuchi, Y. H. Kim, K. B. Lee, M. K. Lee, J. S. Lee, Y. Fukuda, Y. Itow, Y. Nishitani, K. Masuda, H. Takiya, H. Uchida, Y. D. Kim, F. Kusaba, D. Motoki, K. Nishijima, K. Fujii, I. Murayama, S. Nakamura

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 784   page: 499 - 503   2015.6

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    XMASS is a multipurpose liquid-xenon detector that currently aims to directly detect dark matter. In this paper, we describe the fabrication and characterization of reference sources used for the energy calibration and position reconstruction of the present XMASS detector. Several gamma-ray sources were produced in the form of a sealed needle-source. A thin-wall tube with a diameter of approximately 0.2 mm was sealed at both ends, with the Am-241 or Co-57 source material contained inside. The active region of the source was observed to be 1-2 mm long, close to the tip of the needle. These sources were tested in the XMASS detector, and the results were compared with Monte-Carlo simulations. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.nima.2014.11.012

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  63. Search for Bosonic Superweakly Interacting Massive Dark Matter Particles with the XMASS-I Detector International coauthorship International journal

    K. Abe, K. Hieda, K. Hiraide, S. Hirano, Y. Kishimoto, K. Ichimura, K. Kobayashi, S. Moriyama, K. Nakagawa, M. Nakahata, H. Ogawa, N. Oka, H. Sekiya, A. Shinozaki, Y. Suzuki, A. Takeda, O. Takachio, D. Umemoto, M. Yamashita, B. S. Yang, S. Tasaka, J. Liu, K. Martens, K. Hosokawa, K. Miuchi, A. Murata, Y. Onishi, Y. Otsuka, Y. Takeuchi, Y. H. Kim, K. B. Lee, M. K. Lee, J. S. Lee, Y. Fukuda, Y. Itow, K. Masuda, H. Takiya, H. Uchida, N. Y. Kim, Y. D. Kim, F. Kusaba, K. Nishijima, K. Fujii, I. Murayama, S. Nakamura

    PHYSICAL REVIEW LETTERS   Vol. 113 ( 12 )   2014.9

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    DOI: 10.1103/PhysRevLett.113.121301

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  64. Search for inelastic WIMP nucleus scattering on Xe-129 in data from the XMASS-I experiment International coauthorship International journal

    H. Uchida, K. Abe, K. Hieda, K. Hiraide, S. Hirano, K. Ichimura, Y. Kishimoto, K. Kobayashi, S. Moriyama, K. Nakagawa, M. Nakahata, H. Ogawa, N. Oka, H. Sekiya, A. Shinozaki, Y. Suzuki, A. Takeda, O. Takachio, D. Umemoto, M. Yamashita, B. S. Yang, S. Tasaka, J. Liu, K. Martens, K. Hosokawa, K. Miuchi, A. Murata, Y. Onishi, Y. Otsuka, Y. Takeuchi, Y. H. Kim, K. B. Lee, M. K. Lee, J. S. Lee, Y. Fukuda, Y. Itow, K. Masuda, Y. Nishitani, H. Takiya, N. Y. Kim, Y. D. Kim, F. Kusaba, K. Nishijima, K. Fujii, I. Murayama, S. Nakamura

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS   Vol. 2014 ( 6 )   2014.6

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    DOI: 10.1093/ptep/ptu064

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  65. Knowledge, attitudes, and practice patterns in surgical management of bicuspid aortopathy: A survey of 100 cardiac surgeons International coauthorship International journal Open Access

    Verma S., Yanagawa B., Kalra S., Ruel M., Peterson M.D., Yamashita M.H., Fagan A., Currie M.E., White C.W., Wai Sang S.L., Rosu C., Singh S., Mewhort H., Gupta N., Fedak P.W.M.

    Journal of Thoracic and Cardiovascular Surgery   Vol. 146 ( 5 ) page: 1033 - e4   2013.11

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    Objective Clinical practice guidelines have been established for surgical management of the aorta in bicuspid aortic valve disease. We hypothesized that surgeons' knowledge of and attitudes toward bicuspid aortic valve aortopathy influence their surgical approaches. Methods We surveyed cardiac surgeons to probe the knowledge of, attitudes toward, and surgical management of bicuspid aortopathy. A total of 100 Canadian adult cardiac surgeons participated. Results Fifty-two percent of surgeons believed that the mechanism underlying aortic dilation in those with bicuspid aortic valve was due to an inherent genetic abnormality of the aorta, whereas only 2% believed that altered valve-related processes were involved in this process. Only a minority (15%) believed that bicuspid valve leaflet fusion type is associated with a unique pattern of aortic dilatation aortic phenotype. Sixty-five percent of surgeons recommended echocardiographic screening of first-degree relatives of patients with bicuspid aortic valve. Most surgeons (61%) elected to replace the aorta when the diameter is 45 mm or greater at the time of valve surgery. Fifty-five percent of surgeons surveyed suggested that in the absence of concomitant valvular disease, they would recommend ascending aortic replacement at a threshold of 50 mm or greater. Approximately one third of surgeons suggested that they would elect to replace a mildly dilated ascending aorta (40 mm) at the time of valve surgery. The most common surgical approach (61%) for combined valve and aortic surgery was aortic valve replacement and supracoronary replacement of the ascending aorta, and only a minority suggested the use of deep hypothermic circulatory arrest and open distal anastomosis. More aggressive approaches were favored with greater surgeon experience, and when circulatory arrest was chosen, the majority (68%) suggested they would use antegrade cerebral perfusion. In the setting of aortic insufficiency and a dilated aorta, 42% of surgeons suggested that they would perform valve-sparing surgery. Of note, 40% of respondents used an index measure of aortic size to body surface area in addition to absolute aortic diameter in assessing the threshold for intervention. Conclusions This large survey uncovered significant gaps in the knowledge and attitudes of surgeons toward the diagnosis and management of bicuspid aortopathy, many of which were at odds with current guideline recommendations. Efforts to promote knowledge translation in this area are strongly encouraged. Copyright © 2013 by The American Association for Thoracic Surgery.

    DOI: 10.1016/j.jtcvs.2013.06.037

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  66. XMASS detector International coauthorship International journal

    K. Abe, K. Hieda, K. Hiraide, S. Hirano, Y. Kishimoto, K. Kobayashi, S. Moriyama, K. Nakagawa, M. Nakahata, H. Nishiie, H. Ogawa, N. Oka, H. Sekiya, A. Shinozaki, Y. Suzuki, A. Takeda, O. Takachio, K. Ueshima, D. Umemoto, M. Yamashita, B. S. Yang, S. Tasaka, J. Liu, K. Martens, K. Hosokawa, K. Miuchi, A. Murata, Y. Onishi, Y. Otsuka, Y. Takeuchi, Y. H. Kim, K. B. Lee, M. K. Lee, J. S. Lee, Y. Fukuda, Y. Itow, Y. Nishitani, K. Masuda, H. Takiya, H. Uchida, N. Y. Kim, Y. D. Kim, F. Kusaba, D. Motoki, K. Nishijima, K. Fujii, I. Murayama, S. Nakamura

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 716   page: 78 - 85   2013.7

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    DOI: 10.1016/j.nima.2013.03.059

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  67. Search for solar axions in XMASS, a large liquid-xenon detector International coauthorship International journal

    K. Abe, K. Hieda, K. Hiraide, S. Hirano, Y. Kishimoto, K. Kobayashi, S. Moriyama, K. Nakagawa, M. Nakahata, H. Ogawa, N. Oka, H. Sekiya, A. Shinozaki, Y. Suzuki, A. Takeda, O. Takachio, K. Ueshima, D. Umemoto, M. Yamashita, B. S. Yang, S. Tasaka, J. Liu, K. Martens, K. Hosokawa, K. Miuchi, A. Murata, Y. Onishi, K. Otsuka, Y. Takeuchi, Y. H. Kim, K. B. Lee, M. K. Lee, J. S. Lee, Y. Fukuda, Y. Itow, K. Masuda, Y. Nishitani, H. Takiya, H. Uchida, N. Y. Kim, Y. D. Kim, F. Kusaba, D. Motoki, K. Nishijima, K. Fujii, I. Murayama, S. Nakamura

    PHYSICS LETTERS B   Vol. 724 ( 1-3 ) page: 46 - 50   2013.7

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    DOI: 10.1016/j.physletb.2013.05.060

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  68. Light WIMP search in XMASS International coauthorship International journal

    K. Abe, K. Hieda, K. Hiraide, S. Hirano, Y. Kishimoto, K. Kobayashi, S. Moriyama, K. Nakagawa, M. Nakahata, H. Ogawa, N. Oka, H. Sekiya, A. Shinozaki, Y. Suzuki, A. Takeda, O. Takachio, K. Ueshima, D. Umemoto, M. Yamashita, B. S. Yang, S. Tasaka, J. Liu, K. Martens, K. Hosokawa, K. Miuchi, A. Murata, Y. Onishi, Y. Otsuka, Y. Takeuchi, Y. H. Kim, K. B. Lee, M. K. Lee, J. S. Lee, Y. Fukuda, Y. Itow, K. Masuda, Y. Nishitani, H. Takiya, H. Uchida, N. Y. Kim, Y. D. Kim, F. Kusaba, D. Motoki, K. Nishijima, K. Fujii, I. Murayama, S. Nakamura

    PHYSICS LETTERS B   Vol. 719 ( 1-3 ) page: 78 - 82   2013.2

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    A search for light dark matter using low-threshold data from the single phase liquid xenon scintillation detector XMASS, has been conducted. Using the entire 835 kg inner volume as target, the analysis threshold can be lowered to 0.3 keVee (electron-equivalent) to search for light dark matter. With low-threshold data corresponding to a 5591.4 kg day exposure of the detector and without discriminating between nuclear-recoil and electronic events, XMASS excludes part of the parameter space favored by other experiments. (c) 2013 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physletb.2013.01.001

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  69. Direct dark matter search with xmass

    Masaki Yamashita, Masaki Yamashita

    Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013   Vol. 2013-October   2013.1

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    © 2013 Sociedade Brasileira de Fisica. All Rights Reserved. XMASS is a multi-purpose experiment which aims at the direct detection of dark matter, low energy solar neutrinos, and neutrino less double beta decay with a ton scale fiducial volume of liquid xenon detector. In the current stage, we focus on the the direct detection of dark matter in the form of WIMPs (Weakly Interacting Massive Particles) via their elastic scattering off xenon nuclei with 835 kg detector at Kamioka in Japan. The first result from a low mass WIMP search done with a very low energy threshold is presented.

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  70. The XENON100 dark matter experiment International coauthorship International journal Open Access

    E. Aprile, K. Arisaka, F. Arneodo, A. Askin, L. Baudis, A. Behrens, E. Brown, J. M. R. Cardoso, B. Choi, D. Cline, S. Fattori, A. D. Ferella, K. L. Giboni, A. Kish, C. W. Lam, R. F. Lang, K. E. Lim, J. A. M. Lopes, T. Marrodan Undagoitia, Y. Mei, A. J. Melgarejo Fernandez, K. Ni, U. Oberlack, S. E. A. Orrigo, E. Pantic, G. Plante, A. C. C. Ribeiro, R. Santorelli, J. M. F. dos Santos, M. Schumann, P. Shagin, A. Teymourian, E. Tziaferi, H. Wang, M. Yamashita

    ASTROPARTICLE PHYSICS   Vol. 35 ( 9 ) page: 573 - 590   2012.4

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    DOI: 10.1016/j.astropartphys.2012.01.003

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  71. Radon removal from gaseous xenon with activated charcoal International coauthorship International journal

    K. Abe, K. Hieda, K. Hiraide, S. Hirano, Y. Kishimoto, K. Kobayashi, Y. Koshio, J. Liu, K. Martens, S. Moriyama, M. Nakahata, H. Nishiie, H. Ogawa, H. Sekiya, A. Shinozaki, Y. Suzuki, O. Takachio, A. Takeda, K. Ueshima, D. Umemoto, M. Yamashita, K. Hosokawa, A. Murata, K. Otsuka, Y. Takeuchi, F. Kusaba, D. Motoki, K. Nishijima, S. Tasaka, K. Fujii, I. Murayama, S. Nakamura, Y. Fukuda, Y. Itow, K. Masuda, Y. Nishitani, H. Takiya, H. Uchida, Y. D. Kim, Y. H. Kim, K. B. Lee, M. K. Lee, J. S. Lee

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 661 ( 1 ) page: 50 - 57   2012.1

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    Many low background experiments using xenon need to remove radioactive radon to improve their sensitivities. However, no method of continually removing radon from xenon has been described in the literature. We studied a method to remove radon from xenon gas through an activated charcoal trap. From our measurements we infer a linear relationship between the mean propagation velocity v(Rn) of radon and v(Xe) of xenon in the trap with v(Rn)/v(Xe) = (0.96 +/- 0.10) x 10(-3) at -85 degrees C. As the mechanism for radon removal in this charcoal trap is its decay, knowledge of this parameter allows us to design an efficient radon removal system for the XMASS experiment. The verification of this system found that it reduces radon by a factor of 0.07, which is in line with its expected average retention time of 14.8 days for radon. (C) 2011 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.nima.2011.09.051

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  72. Scintillation-only based pulse shape discrimination for nuclear and electron recoils in liquid xenon International coauthorship International journal

    K. Ueshima, K. Abe, K. Hiraide, S. Hirano, Y. Kishimoto, K. Kobayashi, Y. Koshio, J. Liu, K. Martens, S. Moriyama, M. Nakahata, H. Nishiie, H. Ogawa, H. Sekiya, A. Shinozaki, Y. Suzuki, A. Takeda, M. Yamashita, K. Fujii, I. Murayama, S. Nakamura, K. Otsuka, Y. Takeuchi, Y. Fukuda, K. Nishijima, D. Motoki, Y. Itow, K. Masuda, Y. Nishitani, H. Uchida, S. Tasaka, H. Ohsumi, Y. D. Kim, Y. H. Kim, K. B. Lee, M. K. Lee, J. S. Lee

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 659 ( 1 ) page: 161 - 168   2011.12

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    DOI: 10.1016/j.nima.2011.09.011

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  73. Search for Light Dark Matter in XENON10 Data International coauthorship International journal Open Access

    J. Angle, E. Aprile, F. Arneodo, L. Baudis, A. Bernstein, A. I. Bolozdynya, L. C. C. Coelho, C. E. Dahl, L. DeViveiros, A. D. Ferella, L. M. P. Fernandes, S. Fiorucci, R. J. Gaitskell, K. L. Giboni, R. Gomez, R. Hasty, L. Kastens, J. Kwong, J. A. M. Lopes, N. Madden, A. Manalaysay, A. Manzur, D. N. McKinsey, M. E. Monzani, K. Ni, U. Oberlack, J. Orboeck, G. Plante, R. Santorelli, J. M. F. dos Santos, S. Schulte, P. Shagin, T. Shutt, P. Sorensen, C. Winant, M. Yamashita

    PHYSICAL REVIEW LETTERS   Vol. 107 ( 5 )   2011.7

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    DOI: 10.1103/PhysRevLett.107.051301

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  74. Design and performance of the XENON10 dark matter experiment

    E. Aprile, J. Angle, F. Arneodo, L. Baudis, A. Bernstein, A. Bolozdynya, P. Brusov, L. C. C. Coelho, C. E. Dahl, L. DeViveiros, A. D. Ferella, L. M. P. Fernandes, S. Fiorucci, R. J. Gaitskell, K. L. Giboni, R. Gomez, R. Hasty, L. Kastens, J. Kwong, J. A. M. Lopes, N. Madden, A. Manalaysay, A. Manzur, D. N. McKinsey, M. E. Monzani, K. Ni, U. Oberlack, J. Orboeck, D. Orlandi, G. Plante, R. Santorelli, J. M. F. dos Santos, P. Shagin, T. Shutt, P. Sorensen, S. Schulte, E. Tatananni, C. Winant, M. Yamashita

    ASTROPARTICLE PHYSICS   Vol. 34 ( 9 ) page: 679 - 698   2011.4

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    XENON10 is the first two-phase xenon time projection chamber (TPC) developed within the XENON dark matter search program. The TPC, with an active liquid xenon (LXe) mass of about 14 kg, was installed at the Gran Sasso Underground Laboratory (LNGS) in Italy, and operated for more than one year, with excellent stability and performance. Results from a dark matter search with XENON10 have been published elsewhere. In this paper, we summarize the design and performance of the detector and its subsystems, based on calibration data using sources of gamma-rays and neutrons as well as background and Monte Carlo simulation data. The results on the detector's energy threshold, position resolution, and overall efficiency show a performance that exceeds design specifications, in view of the very low energy threshold achieved (&lt; 10 keVr) and low background rate achieved. (C) 2011 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.astropartphys.2011.01.006

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  75. Lowering the low-energy threshold of xenon detectors International coauthorship International journal

    P. Sorensen, J. Angle, J. Angle, E. Aprile, F. Arneodo, L. Baudis, L. Baudis, A. Bernstein, A. Bolozdynya, L. C.C. Coelho, C. E. Dahl, C. E. Dahl, L. DeViveiros, A. D. Ferella, A. D. Ferella, L. M.P. Fernandes, S. Fiorucci, R. J. Gaitskell, K. L. Giboni, R. Gomez, R. Hasty, L. Kastens, J. Kwong, J. Kwong, J. A.M. Lopes, N. Madden, N. Madden, A. Manalaysay, A. Manzur, D. N. McKinsey, M. E. Monzani, K. Ni, U. Oberlack, J. Orboeck, G. Plante, R. Santorelli, J. M.F, Dos Santos, S. Schulte, P. Shagin, T. Shutt, C. Winant, M. Yamashita

    Proceedings of Science     2010.12

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    We show that the energy threshold for nuclear recoils in the XENON10 dark matter search data can be lowered to ∼ 1 keV, by using only the ionization signal. In other words, we make no requirement that a valid event contain a primary scintillation signal. We therefore relinquish incident particle type discrimination, which is based on the ratio of ionization to scintillation in liquid xenon. This method compromises the detector&#039;s ability to precisely determine the z coordinate of a particle interaction. However, we show for the first time that it is possible to discriminate bulk events from surface events based solely on the ionization signal. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.

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  76. Laparoscopic vs open hepatic resection for benign and malignant tumors: An updated meta-analysis International coauthorship International journal

    Croome K.P., Yamashita M.H.

    Archives of Surgery   Vol. 145 ( 11 ) page: 1109 - 1118   2010.11

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    Objective: To compare laparoscopic hepatic resection (LHR) with open hepatic resection (OHR) for benign and malignant tumors. Data Sources: MEDLINE, CENTRAL, and EMBASE databases were searched for relevant studies published between January 1, 1998, and May 1, 2009. Study Selection: Studies clearly documenting a comparison of LHR with OHR for benign and malignant neoplasms were selected. Data Extraction: Operative and postoperative measures, resection margins, complications, and survival outcomes were evaluated. Weighted mean differences, relative risks, and hazard ratios (HRs) were calculated using a random-effects model. Results: Twenty-six studies were included in the meta-analysis. The HR of death for malignant tumors was significantly lower in the LHR group compared with the OHR group (HR,0.64; P=.04). The HR of recurrence for malignant tumors was not significantly different between the 2 groups (HR,0.79; P=.37). The LHR group had a lower operative blood loss (weighted mean difference,-161 mL; P<.001) and relative risk of total postoperative complications (relative risk,0.40; P<.001). Duration of hospital stay, days of intravenous narcotic use, and days until oral intake were all significantly lower in the LHR group compared with the OHR group. Operative time between LHR and OHR was not significantly different. Conclusions: Laparoscopic hepatic resection for malignant tumors is associated with a long-term survival that is at least comparable, if not superior, to OHR with no difference in disease recurrence. The use of LHR for benign and malignant tumors is a safe alternative to OHR with potential operative and postoperative benefits. ©2010 American Medical Association. All rights reserved.

    DOI: 10.1001/archsurg.2010.227

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  77. XMASS International coauthorship International journal

    Masaki Yamashita

    Proceedings of the 6th Patras Workshop on Axions, WIMPs and WISPs, PATRAS 2010     page: 129 - 132   2010

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Verlag Deutsches Elektronen-Synchrotron  

    DOI: 10.3204/DESY-PROC-2010-03/yamashita_masaki

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  78. Constraints on inelastic dark matter from XENON10 International coauthorship International journal Open Access

    J. Angle, E. Aprile, F. Arneodo, L. Baudis, A. Bernstein, A. Bolozdynya, L. C. C. Coelho, C. E. Dahl, L. DeViveiros, A. D. Ferella, L. M. P. Fernandes, S. Fiorucci, R. J. Gaitskell, K. L. Giboni, R. Gomez, R. Hasty, L. Kastens, J. Kwong, J. A. M. Lopes, N. Madden, A. Manalaysay, A. Manzur, D. N. McKinsey, M. E. Monzani, K. Ni, U. Oberlack, J. Orboeck, G. Plante, R. Santorelli, J. M. F. dos Santos, P. Shagin, T. Shutt, P. Sorensen, S. Schulte, C. Winant, M. Yamashita

    PHYSICAL REVIEW D   Vol. 80 ( 11 )   2009.12

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    It has been suggested that dark matter particles which scatter inelastically from detector target nuclei could explain the apparent incompatibility of the DAMA modulation signal (interpreted as evidence for particle dark matter) with the null results from CDMS-II and XENON10. Among the predictions of inelastically interacting dark matter are a suppression of low-energy events, and a population of nuclear recoil events at higher nuclear recoil equivalent energies. This is in stark contrast to the well-known expectation of a falling exponential spectrum for the case of elastic interactions. We present a new analysis of XENON10 dark matter search data extending to E(nr)=75 keV nuclear recoil equivalent energy. Our results exclude a significant region of previously allowed parameter space in the model of inelastically interacting dark matter. In particular, it is found that dark matter particle masses m(chi)greater than or similar to 150 GeV are disfavored.

    DOI: 10.1103/PhysRevD.80.115005

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  79. Distillation of liquid xenon to remove krypton International coauthorship International journal

    K. Abe, J. Hosaka, T. Iida, M. Ikeda, K. Kobayashi, Y. Koshio, A. Minamino, M. Miura, S. Moriyama, M. Nakahata, Y. Nakajima, T. Namba, H. Ogawa, H. Sekiya, M. Shiozawa, Y. Suzuki, A. Takeda, Y. Takeuchi, K. Ueshima, M. Yamashita, K. Kaneyuki, Y. Ebizuka, J. Kikuchi, A. Ota, S. Suzuki, T. Takahashi, H. Hagiwara, T. Kamei, K. Miyamoto, T. Nagase, S. Nakamura, Y. Ozaki, T. Sato, Y. Fukuda, T. Sato, K. Nishijima, M. Sakurai, T. Maruyama, D. Motoki, Y. Itow, H. Ohsumi, S. Tasaka, S. B. Kim, Y. D. Kim, J. I. Lee, S. H. Moon, Y. Urakawa, M. Uchino, Y. Kamioka

    ASTROPARTICLE PHYSICS   Vol. 31 ( 4 ) page: 290 - 296   2009.5

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    A high performance distillation system to remove krypton from xenon was constructed, and a purity level of Kr/Xe = similar to 3 x 10(-12) was achieved. This development is crucial in facilitating high-sensitivity low-background experiments such as the search for dark matter in the universe. (C) 2009 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.astropartphys.2009.02.006

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  80. The scintillation and ionization yield of liquid xenon for nuclear recoils International coauthorship International journal Open Access

    P. Sorensen, A. Manzur, C. E. Dahl, J. Angle, E. Aprile, F. Arneodo, L. Baudis, A. Bernstein, A. Bolozdynya, L. C. C. Coelho, L. DeViveiros, A. D. Ferella, L. M. P. Fernandes, S. Fiorucci, R. J. Gaitskell, K. L. Giboni, R. Gomez, R. Hasty, L. Kastens, J. Kwong, J. A. M. Lopes, N. Madden, A. Manalaysay, D. N. McKinsey, M. E. Monzani, K. Ni, U. Oberlack, J. Orboeck, G. Plante, R. Santorelli, J. M. F. dos Santos, P. Shagin, T. Shutt, S. Schulte, C. Winant, M. Yamashita

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 601 ( 3 ) page: 339 - 346   2009.4

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    DOI: 10.1016/j.nima.2008.12.197

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  81. New measurement of the relative scintillation efficiency of xenon nuclear recoils below 10 keV International coauthorship International journal Open Access

    E. Aprile, L. Baudis, B. Choi, K. L. Giboni, K. Lim, A. Manalaysay, M. E. Monzani, G. Plante, R. Santorelli, M. Yamashita

    PHYSICAL REVIEW C   Vol. 79 ( 4 )   2009.4

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    Liquid xenon is an important detection medium indirect dark matter experiments, which search for low-energy nuclear recoils produced by the elastic scattering of WIMPs with quarks. The two existing measurements of the relative scintillation efficiency of nuclear recoils below 20 keV lead to inconsistent extrapolations at lower energies. This results in a different energy scale and thus sensitivity reach of liquid xenon dark matter detectors. We report a new measurement of the relative scintillation efficiency below 10 keV performed with a liquid xenon scintillation detector, optimized for maximum light collection. Greater than 95% of the interior surface of this detector was instrumented with photomultiplier tubes, giving a scintillation yield of 19.6 photoelectrons/keV electron equivalent for 122-keV gamma rays. We find that the relative scintillation efficiency for nuclear recoils of 5 keV is 0.14, staying constant around this value up to 10 keV. For higher energy recoils we measure a value of 0.21, consistent with previously reported data. In light of this new measurement, the XENON10 experiment&apos;s upper limits on spin-independent WIMP-nucleon cross section, which were calculated assuming a constant 0.19 relative scintillation efficiency, change from 8.8 x 10(-44) cm(2) to 9.9 x 10(-44) cm(2) for WIMPs of mass 100 GeV/c(2), and from 4.5 x 10(-44) cm(2) to 5.6 x 10(-44) cm(2) for WIMPs of mass 30 GeV/c(2).

    DOI: 10.1103/PhysRevC.79.045807

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  82. XMASS Experiment(16th YKIS Conference Progress in Particle Physics 2008) International coauthorship International journal

    Yamashita Masaki

    Soryushiron Kenkyu Electronics   Vol. 117 ( 3 ) page: C45 - C47   2009

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    The final goal of XMASS experiment aims at the direct dark matter, the solar neutrinos from pp and ^7Be and neutrino less double beta decay with ton scale fiducial volume of liquid xenon detector. In the current stage, we focus on the the direct detection of dark matter in the form of WIMPs (Weakly Interacting Massive Particles) via their elastic scattering off Xenon nuclei with 800kg detector at Kamioka in Japan. XMASS 800kg detector will achieve a sensitivity more than two order of magnitude beyond current limits of WIMP-nucleus cross section to reach 10^&lt;-45&gt;cm^2 for the spin independent case. The status of experiment will be review and discussed here.

    DOI: 10.24532/soken.117.3_C7

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  83. First Result from the XENON10 Dark Matter Experiment

    YAMASHITA Masaki

    Butsuri   Vol. 63 ( 12 ) page: 953 - 956   2008.12

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    In April 2007, the first result from XENON10 group was announced at the annual meeting of the American Physics Society. The double-phase Xenon detector was used for the direct dark matter search experiment. For a WIMP mass of 30 (100) GeV/c^2, the upper limit is 4.5(8.8)×10^&lt;-44&gt;cm^2, a factor of 2.3 lower than the previously best published. In this article, the performance of XENON10 detector is described in detail.

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  84. Scintillation yield of liquid xenon at room temperature International coauthorship International journal

    K. Ueshima, K. Abe, T. Iida, M. Ikeda, K. Kobayashi, Y. Koshio, A. Minamino, M. Miura, S. Moriyama, M. Nakahata, Y. Nakajima, H. Ogawa, H. Sekiya, M. Shiozawa, Y. Suzuki, A. Takeda, Y. Takeuchi, M. Yamashita, K. Kaneyuki, T. Doke, Y. Ebizuka, J. Kikuchi, A. Ota, S. Suzuki, T. Takahashi, H. Hagiwara, T. Kamei, K. Miyamoto, T. Nagase, S. Nakamura, Y. Ozaki, T. Sato, Y. Fukuda, T. Sato, K. Nishijima, M. Sakurai, T. Maruyama, D. Motoki, Y. Itow, H. Ohsumi, S. Tasaka, S. B. Kim, Y. D. Kim, J. I. Lee, S. H. Moon

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 594 ( 2 ) page: 148 - 154   2008.9

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    DOI: 10.1016/j.nima.2008.06.017

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  85. Limits on spin-dependent WIMP-nucleon cross sections from the XENON10 experiment International coauthorship International journal Open Access

    J. Angle, E. Aprile, F. Arneodo, L. Baudis, A. Bernstein, A. Bolozdynya, L. C. C. Coelho, C. E. Dahl, L. DeViveiros, A. D. Ferella, L. M. P. Fernandes, S. Fiorucci, R. J. Gaitskell, K. L. Giboni, R. Gomez, R. Hasty, L. Kastens, J. Kwong, J. A. M. Lopes, N. Madden, A. Manalaysay, A. Manzur, D. N. McKinsey, M. E. Monzani, K. Ni, U. Oberlack, J. Orboeck, G. Plante, R. Santorelli, J. M. F. dos Santos, P. Shagin, T. Shutt, P. Sorensen, S. Schulte, C. Winant, M. Yamashita

    PHYSICAL REVIEW LETTERS   Vol. 101 ( 9 )   2008.8

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    XENON10 is an experiment to directly detect weakly interacting massive particles (WIMPs), which may comprise the bulk of the nonbaryonic dark matter in our Universe. We report new results for spin-dependent WIMP-nucleon interactions with Xe-129 and Xe-131 from 58.6 live days of operation at the Laboratori Nazionali del Gran Sasso. Based on the nonobservation of a WIMP signal in 5.4 kg of fiducial liquid xenon mass, we exclude previously unexplored regions in the theoretically allowed parameter space for neutralinos. We also exclude a heavy Majorana neutrino with a mass in the range of similar to 10 GeV/c(2) -2 TeV/c(2) as a dark matter candidate under standard assumptions for its density and distribution in the galactic halo.

    DOI: 10.1103/PhysRevLett.101.091301

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  86. First results from the XENON10 dark matter experiment at the Gran Sasso National Laboratory International coauthorship International journal Open Access

    J. Angle, E. Aprile, F. Arneodo, L. Baudis, A. Bernstein, A. Bolozdynya, P. Brusov, L. C. C. Coelho, C. E. Dahl, L. DeViveiros, A. D. Ferella, L. M. P. Fernandes, S. Fiorucci, R. J. Gaitskell, K. L. Giboni, R. Gomez, R. Hasty, L. Kastens, J. Kwong, J. A. M. Lopes, N. Madden, A. Manalaysay, A. Manzur, D. N. McKinsey, M. E. Monzani, K. Ni, U. Oberlack, J. Orboeck, G. Plante, R. Santorelli, J. M. F. dos Santos, P. Shagin, T. Shutt, P. Sorensen, S. Schulte, C. Winant, M. Yamashita

    PHYSICAL REVIEW LETTERS   Vol. 100 ( 2 )   2008.1

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    The XENON10 experiment at the Gran Sasso National Laboratory uses a 15 kg xenon dual phase time projection chamber to search for dark matter weakly interacting massive particles (WIMPs). The detector measures simultaneously the scintillation and the ionization produced by radiation in pure liquid xenon to discriminate signal from background down to 4.5 keV nuclear-recoil energy. A blind analysis of 58.6 live days of data, acquired between October 6, 2006, and February 14, 2007, and using a fiducial mass of 5.4 kg, excludes previously unexplored parameter space, setting a new 90% C.L. upper limit for the WIMP-nucleon spin-independent cross section of 8.8x10(-44) cm(2) for a WIMP mass of 100 GeV/c(2), and 4.5x10(-44) cm(2) for a WIMP mass of 30 GeV/c(2). This result further constrains predictions of supersymmetric models.

    DOI: 10.1103/PhysRevLett.100.021303

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  87. Xenon International coauthorship International journal

    Masaki Yamashita

    Proceedings of the 6th International Workshop on the Identification of Dark Matter, IDM 2006     page: 58 - 64   2007.12

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    DOI: 10.1142/9789812770288_0007

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  88. XENON International coauthorship International journal

    E. Aprile, K. -L. Giboni, M. E. Monzani, G. Plante, M. Yamashita, R. J. Gaitskell, S. Fiorucci, P. Sorensen, L. DeViveiroS, A. Bernstein, N. Madden, C. Winant, T. Shutt, J. Kwong, A. Bolozdynya, E. Dahl, U. Oberlack, P. Shagin, R. Gomez, D. McKinsey, A. Manzur, R. Hasty, K. Ni, F. Arneodo, A. Ferella, L. Baudis, J. Angle, J. Orboeek, A. Manalaysay, J. A. M. Lopes, L. Coelho, L. Fernandes, J. Santos

    NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS   Vol. 173   page: 113 - 116   2007.11

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    DOI: 10.1016/j.nuclphysbps.2007.08.142

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  89. 3D position sensitive XeTPC for dark matter search

    J. Angle, E. Aprile, F. Arneodo, L. Baudis, A. Bernsteine, A. Bolozdynya, L. Coelho, E. Dahl, L. DeViveiros, A. Ferella, L. Fernandes, S. Fiorucci, R. J. Gaitskell, K. -L. Giboni, R. Gomez, R. Hasty, J. Kwong, J. A. M. Lopes, N. Madden, A. Manalaysay, A. Manzur, D. McKinsey, M. E. Monzani, K. Ni, U. Oberlack, J. Orboeck, G. Plante, J. Santos, P. Shagin, T. Shutt, P. Sorensen, C. Winant, M. Yamashita

    NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS   Vol. 173   page: 117 - 120   2007.11

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    The technique to realize 3D position sensitivity in a two-phase xenon time projection chamber (XeTPC) is described. Results from a prototype detector (XENON3) are presented.

    DOI: 10.1016/j.nuclphysbps.2007.08.033

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  90. Observation of anticorrelation between scintillation and ionization for MeV gamma rays in liquid xenon International coauthorship International journal Open Access

    E. Aprile, K. L. Giboni, P. Majewski, K. Ni, M. Yamashita

    PHYSICAL REVIEW B   Vol. 76 ( 1 )   2007.7

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    A strong anticorrelation between ionization and scintillation signals produced by MeV gamma rays in liquid xenon has been measured and used to improve the energy resolution by combining the two signals. The improvement is explained by reduced electron-ion recombination fluctuations of the combined signal compared to fluctuations of the individual signals. Simultaneous measurements of ionization and scintillation signals were carried out with Cs-137, Na-22, and Co-60 gamma rays, as a function of electric field in the liquid. A resolution of 1.7%(sigma) at 662 keV was measured at 1 kV/cm, significantly better than the resolution from either scintillation or ionization alone. A detailed analysis indicates that further improvement to less than 1%(sigma) is possible with higher light collection efficiency and lower electronic noise.

    DOI: 10.1103/PhysRevB.76.014115

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  91. 25pSE-1 XENON Dark Matter Search Experiment at Gran Sasso International coauthorship International journal

    Yamashita Masaki

    Meeting Abstracts of the Physical Society of Japan   Vol. 62.1.1 ( 0 ) page: 60   2007

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    DOI: 10.11316/jpsgaiyo.62.1.1.0_60_4

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  92. Gamma ray spectroscopy with scintillation light in liquid xenon International coauthorship International journal Open Access

    K. Ni, E. Aprile, K. L. Giboni, P. Majewski, M. Yamashita

    JOURNAL OF INSTRUMENTATION   Vol. 1 ( 1 ) page: 1 - 11   2006.9

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    Scintillation light from gamma ray irradiation in liquid xenon is detected by two Hamamatsu R9288 photomultiplier tubes (PMTs) immersed in the liquid. UV light reflector material, PTFE, is used to optimize the light collection efficiency. The detector gives a high light yield of 6 photoelectron per keV (pe/keV), which allows efficient detection of the 122 keV gamma-ray line from (57)Co, with a measured energy resolution of (8.8 +/- 0.6)% (sigma). The best achievable energy resolution, by removing the instrumental fluctuations, from liquid xenon scintillation light is estimated to be around 6-8% (sigma) for gamma-ray with energy between 662 keV and 122 keV.

    DOI: 10.1088/1748-0221/1/09/P09004

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  93. Simultaneous measurement of ionization and scintillation from nuclear recoils in liquid xenon for a dark matter experiment International coauthorship International journal Open Access

    E. Aprile, C. E. Dahl, L. de Viveiros, R. J. Gaitskell, K. L. Giboni, J. Kwong, P. Majewski, K. Ni, T. Shutt, M. Yamashita

    PHYSICAL REVIEW LETTERS   Vol. 97 ( 8 ) page: 081302   2006.8

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    DOI: 10.1103/PhysRevLett.97.081302

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  94. Performance of a large area avalanche photodiode in a liquid xenon ionization and scintillation chamber International coauthorship International journal Open Access

    K Ni, E Aprile, D Day, KL Giboni, JAM Lopes, P Majewski, M Yamashita

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 551 ( 2-3 ) page: 356 - 363   2005.10

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    Scintillation light produced in liquid xenon (LXe) by alpha particles, electrons and gamma-rays was detected with a large area avalanche photodiode (LAAPD) immersed in the liquid. The alpha scintillation yield was measured as a function of applied electric field. We estimate the quantum efficiency of the LAAPD to be 45%. The best energy resolution from the light measurement at zero electric field is 7.5%(sigma) for 976keV internal conversion electrons from Bi-207 and 2.6%(sigma) for 5.5MeV alpha particles from Am-241. The detector used for these measurements was also operated as a gridded ionization chamber to measure the charge yield. We confirm that using a LAAPD in LXe does not introduce impurities which inhibit the drifting of free electrons. (c) 2005 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.nima.2005.06.054

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  95. Fast timing measurements of gamma-ray events in liquid xenon

    KL Giboni, E Aprile, P Majewski, KX Ni, M Yamashita

    IEEE TRANSACTIONS ON NUCLEAR SCIENCE   Vol. 52 ( 5 ) page: 1800 - 1804   2005.10

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    We have used newly developed metal-channel photomultipliers (PMTs) from Hamamatsu Photonics to detect the fast scintillation light from liquid xenon. The PMTs are designed to operate within the liquid and to efficiently detect the 175 nm Xe light. Their small transit time spread makes them ideal for fast timing applications. To evaluate the timing characteristics of a liquid xenon detector, we tested a gridded ionization chamber equipped with two such PMTs. Both PMTs observe the same interaction and share the detected scintillation light about equally. At zero field the measured timing resolution is 565 ps FWHM for 122 keV from Co-57 and 227 ps FWHM for 662 keV from Cs-137. For electric fields up to 4 kV/cm drift field the timing resolution remained constant. This timing resolution opens the possibility of a time-of-flight (ToF) measurement between two LXe detectors separated by a distance of 10-20 cm, which is of great interest for background reduction in a Compton telescope for gamma-ray astrophysics.

    DOI: 10.1109/TNS.2005.856763

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  96. Scintillation response of liquid xenon to low energy nuclear recoils Reviewed International coauthorship International journal Open Access

    E Aprile, KL Giboni, P Majewski, K Ni, M Yamashita, R Hasty, A Manzur, DN McKinsey

    PHYSICAL REVIEW D   Vol. 72 ( 7 )   2005.10

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    DOI: 10.1103/PhysRevD.72.072006

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  97. The XENON dark matter search experiment International coauthorship International journal Open Access

    E Aprile, KL Giboni, P Majewski, K Ni, M Yamashita, R Gaitskell, P Sorensen, L DeViveiros, L Baudis, A Bernstein, C Hagmann, C Winant, T Shutt, J Kwong, U Oberlack, D McKinsey, R Hasty

    NEW ASTRONOMY REVIEWS   Vol. 49 ( 2-6 ) page: 289 - 295   2005.5

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    DOI: 10.1016/j.newar.2005.01.035

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  98. The XENON dark matter experiment International coauthorship International journal

    T Shutt, E Aprile, E Baltz, K Giboni, P Majewski, M Yamashita, K Ni, U Oberlack, Vargas, J Kwong, K McDonald, M Niemack, R Gaitskell, P Sorensen, L DeViveiros, W Craig

    NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS   Vol. 138 ( 1-3 ) page: 156 - 159   2005.1

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    DOI: 10.1016/j.nuclphysbps.2004.11.036

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  99. Transparency of a 100 liter liquid xenon scintillation calorimeter prototype and measurement of its energy resolution for 55 MeV photons International coauthorship International journal

    A Baldini, C Bemporad, F Cei, T Doke, M Grassi, T Haruyama, K Kasami, PR Kettle, A Maki, S Mihara, T Mori, D Nicolo, H Nishiguchi, W Ootani, K Ozone, A Papa, R Pazzi, S Ritt, R Sawada, M Schneebeli, F Sergiampietri, G Signorelli, S Suzuki, K Terasawa, M Yamashita, S Yamashita, T Yoshimura, Y Yuri

    ICDL: 2005 IEEE International Conference on Dielectric Liquids     page: 337 - 340   2005

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  100. Measurement of the ionization and scintillation yield of nuclear recoils in liquid xenon International coauthorship International journal

    E Aprile, KL Giboni, S Kamat, P Majewski, K Ni, B Singh, A Yamashita

    ICDL: 2005 IEEE INTERNATIONAL CONFERENCE ON DIELECTRIC LIQUIDS     page: 313 - 316   2005

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    The XENON experiment uses liquid xenon as target and detector to look for dark matter Weakly Interacting Massive Particles (WIMPs) through their elastic scattering off Xe nuclei. With a fiducial mass of 1000 kg of liquid xenon, a sufficiently low threshold of 16 keV recoil energy and an un-rejected background rate of 10 events per year, XENON would be sensitive to a WIMP-nucleon interaction cross section of similar to 10(-46)cm(2), for WIMPs with masses above 50 GeV. Using time projection chambers operating in dual (liquid/gas) phase, XENON simultaneously detects the ionization, through secondary scintillation in the gas, and primary scintillation in the liquid produced by low energy recoils. We present some results from experiments using prototypes irradiated with neutrons to measure the ionization and scintillation yield of low energy nuclear recoils in liquid xenon.

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  101. Performance of dual phase XeTPC with CsI photocathode and PMTs readout for the scintillation light International coauthorship International journal

    E Aprile, KL Giboni, S Kamat, P Majewski, K Ni, BK Singh, M Yamashita

    ICDL: 2005 IEEE International Conference on Dielectric Liquids     page: 345 - 348   2005

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    We have tested a dual phase Xenon Time Projection Chamber (TPC) consisting of a reflective Cesium Iodide photocathode and an array of seven PMTs; for scintillation light readout. Present results show that 19% Quantum Efficiency (QE) of CsI photocathode can be achieved at 3 kV/cm. The dependence of quantum efficiency as a function of different electric field was measured and compared with the recent results obtained with a small chamber operated in parallel plate geometry.

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  102. Scintillation response of liquid Xe surrounded by PTFE reflector for gamma rays International coauthorship International journal

    M Yamashita, T Doke, K Kawasaki, J Kikuchi, S Suzuki

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 535 ( 3 ) page: 692 - 698   2004.12

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    DOI: 10.1016/j.nima.2004.06.168

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  103. Proportional light in a dual-phase XENON chamber International coauthorship International journal

    E Aprile, KL Giboni, P Majewski, KX Ni, M Yamashita

    IEEE TRANSACTIONS ON NUCLEAR SCIENCE   Vol. 51 ( 5 ) page: 1986 - 1990   2004.10

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    A dual-phase xenon chamber was tested to measure the yield of electrons extracted from the liquid to the gas and their subsequent amplification via proportional light. The light yield was studied as a function of electric field and gas pressure. A UV-sensitive compact metal channel photomultiplier tube, placed in the gas above the liquid xenon, was used for these measurements. An electron lifetime of at least 1.5 ms was inferred from a measurement of the ionization signal, triggered by the primary scintillation light, with the same chamber operated in single phase.

    DOI: 10.1109/TNS.2004.832690

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  104. Double phase (liquid/gas) xenon scintillation detector for WIMPs direct search International coauthorship International journal

    M Yamashita, T Doke, J Kikuchi, S Suzuki

    ASTROPARTICLE PHYSICS   Vol. 20 ( 1 ) page: 79 - 84   2003.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    A double phase (liquid/gas) xenon prototype detector of a 0.3 1 active volume for WIMPs direct search has been constructed and tested. Proportional scintillation signals are observed by a multi-wire anode mounted in gas phase after ionization electrons drifted successfully long distance in liquid xenon. Both direct and proportional scintillation were used to discriminate electron recoil from nuclear recoil. Basic performances of the detector and the rejection efficiency of background gamma rays were demonstrated. (C) 2003 Elsevier B.V. All rights reserved.

    DOI: 10.1016/S0927-6505(03)00174-9

    Web of Science

    Scopus

  105. Capacitive level meter for liquid rare gases International coauthorship International journal

    R Sawada, J Kikuchi, E Shibamura, M Yamashita, T Yoshimura

    CRYOGENICS   Vol. 43 ( 8 ) page: 449 - 450   2003.8

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCI LTD  

    An international project to search mu --&gt; egamma decay includes the use of a liquid xenon gamma ray detector. So, a liquid level meter working at a low temperature with low outgassing is needed and the prototype is constructed. The meter shows the liquid level by measuring the capacitance between electrodes with small intervals immersed in the liquid. The operation was successful with the estimated precision of 1 mm in RMS or better. (C) 2003 Published by Elsevier Ltd.

    DOI: 10.1016/S0011-2275(03)00100-0

    Web of Science

    Scopus

  106. Development of a liquid xenon scintillation detector for a new experiment to search for mu -&gt; e gamma decays International coauthorship International journal

    T Doke, T Haruyama, T Ishida, A Maki, T Mashimo, S Mihara, T Mitsuhashi, T Mori, H Nishiguchi, W Ootani, S Orito, K Ozone, R Sawada, S Suzuki, K Terasawa, M Yamashita, J Yashima, T Yoshimura

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 505 ( 1-2 ) page: 199 - 202   2003.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    A novel gamma-ray detector based on a liquid xenon scintillator is under development for a new experiment. to search for the lepton flavor violating process mu(+) --&gt; e(+) gamma at the Paul Scherrer Institute (PSI). The experiment is designed to have a sensitivity down to 10(-14) branching ratio. We constructed a prototype detector with an active volume of 691 to demonstrate the performance of the proposed detector for high-energy gamma rays of around 50 MeV. After a test of the cryogenic system for the prototype detector, we have begun studies with the prototype using a gamma-beam up to 40 MeV from the laser Compton backscattering facility at the TERAS electron storage ring of the National Institute of Advanced Industrial Science and Technology (AIST). (C) 2003 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0168-9002(03)01051-9

    Web of Science

    Scopus

  107. R&D work on a liquid-xenon photon detector for the mu -&gt; e gamma experiment at PSI International coauthorship International journal

    T Doke, T Haruyama, K Kasami, A Maki, T Mashimo, S Mihara, T Miyazawa, T Mori, H Nishiguchi, W Ootani, S Orito, K Ozone, R Sawada, S Suzuki, S Tanaka, K Terasawa, M Yamashita, J Yashima

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 503 ( 1-2 ) page: 290 - 294   2003.5

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    The development of a liquid-xenon photon detector is in progress for an experiment searching for mu(+) --&gt; e(+)gamma at Paul Scherrer Institut (PSI). The detector utilizes liquid xenon as a scintillation material. The scintillation light is observed by photomultiplier tubes (PMTs) immersed in a liquid. An energy resolution of 0.76% is reasonably expected for 52.8 MeVgamma rays from results obtained with a first prototype, where the active volume of 2.3 1 is viewed by 32 PMTs. Another prototype has been constructed with an active volume of 80 1 and 228 PMTs. The performance of the detector will be tested using laser-induced compton backscattered gamma rays up to 40 MeV. (C) 2003 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0168-9002(03)00700-9

    Web of Science

    Scopus

  108. Development of a liquid Xe photon detector for mu -&gt; e gamma decay search experiment at PSI International coauthorship International journal

    S Mihara, T Doke, Y Kamiya, T Mashimo, T Mori, H Nishiguchi, W Ootani, S Orito, K Ozone, R Sawada, S Suzuki, G Tejima, K Terasawa, K Yahagi, M Yamashita, J Yashima

    IEEE TRANSACTIONS ON NUCLEAR SCIENCE   Vol. 49 ( 2 ) page: 588 - 591   2002.4

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    We are developing a new type of photon detector for an experiment to search for muons decaying into a positron and gamma ray. Our sensitivity on the branching ratio is expected to reach 10(-14) by use of the world's most intensive continuous muon beam at Paul Scherrer Institut (PSI). In this experiment, the photon detector will utilize liquid Xenon (Xe) as a scintillation material because of its fast response, large light yield, and high density. The scintillation light emitted in liquid Xe will be directly observed by photomultipliers (PMTs) located in the liquid without the use of a transmission window. In order to study the detector response to gamma rays, we have constructed a prototype with an active volume of 2.3 x 10(3) cm(3) surrounded by 32 PMTs. The PMT is a new development enabling operation at temperatures as low as liquid Xe (165 K). Energy, position, and timing resolutions have been evaluated using gamma-ray sources ranging from 320 keV to 1835 keV. The performance of the prototype is presented in this article.

    DOI: 10.1109/TNS.2002.1003679

    Web of Science

    Scopus

  109. Scintillating fiber camera for neutron dosimetry in spacecraft International coauthorship International journal

    K Terasawa, T Doke, N Hasebe, J Kikuchi, K Kudo, T Murakami, N Takeda, T Tamura, S Torii, M Yamashita, E Yoshihira

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 457 ( 3 ) page: 499 - 508   2001.1

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/S0168-9002(00)00795-6

    Web of Science

    Scopus

  110. Development of a liquid Xe photon detector for μ→eγ decay search experiment at PSI International coauthorship International journal

    S. Mihara, T. Doke, Y. Kamiya, T. Mashimo, T. Mori, H. Nishiguchi, W. Ootani, S. Orito, K. Ozone, R. Sawada, S. Suzuki, G. Tejima, K. Terasawa, K. Yahagi, M. Yamashita, J. Yashima

    IEEE Nuclear Science Symposium and Medical Imaging Conference   Vol. 1   2000.12

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    Language:English   Publishing type:Research paper (scientific journal)  

    We are developing a new type of photon detector for an experiment searching for muon decays to positron and gamma with the sensitivity of 10-14branching ratio by using the world most intensive continuous muon beam provided at PSI. In this experiment the photon detector utilizes liquid xenon as scintillation material because of its fast response, large light output yield, and high density. Scintillation light emitted in liquid Xe is directly observed by photomultipliers (PMTs) located in liquid without any transmission window in order not to lose light yield. To study the detector response to gamma rays we constructed a prototype with an active volume of 2300 cm3surrounded by 32 PMTs. The PMT was newly developed so as to be operated even in liquid Xe at 165K. Energy, position, and timing resolutions have been evaluated with gamma-ray sources from 320keV to 1835keV. Performance of the prototype is presented in this article.

    Scopus

  111. Liquid-gas double phase xenon proportional scintillation detector for direct WIMPs search International coauthorship International journal

    S. Suzuki, T. Doke, K. Kawasaki, J. Kikuchi, M. Yamashita

    IEEE Nuclear Science Symposium and Medical Imaging Conference   Vol. 1   2000.12

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    Language:English   Publishing type:Research paper (scientific journal)  

    A liquid-gas double phase xenon detector for WIMPs with a 0.3/ active volume has been constructed and tested. Proportional scintillation signals are observed after ionization electrons drifted 8cm to a multiwire anode mounted in gas phase. Basic properties of the detector and electrons lifetime were measured. The efficiency of background rejection for grays is tested and discussed.

    Scopus

  112. Response of liquid Xe scintillator for gamma ray International coauthorship International journal

    M. Yamashita, T. Doke, K. Kawasaki, J. Kikuchi, S. Suzuki

    IEEE Nuclear Science Symposium and Medical Imaging Conference   Vol. 1   2000.12

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    Language:English   Publishing type:Research paper (international conference proceedings)  

    Responses of liquid xenon scintillator for γ rays whose energy range was from 59.5keV to 4.43MeV were measured. The experiment was made by a position- independent detector with 300 cc fiducial volume with PTFE Teflon reflector. The light collection efficiency for the detector was calculated by Monte Carlo simulation. The energy resolution and scintillation efficiency for several γ ray sources are presented, compared with another results. We also mention about the application of liquid xenon scintillator detector to physics experiment which is under preparation.

    Scopus

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Books 1

  1. 日経サイエンス ダークセクターは存在するか? 2025/07

    ( Role: Supervisor (editorial))

    日経サイエンス社  2025.7 

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    Language:Japanese Book type:General book, introductory book for general audience

MISC 10

  1. Next Generation Direct Dark Matter Search with the DARWIN/XLZD experiment

    山下雅樹, MARTENS Kai, 身内賢太朗, 伊藤好孝, 伊藤好孝, 風間慎吾, 小林雅俊, 坂元舜, 長谷川智哉, 平岡楓, 宮田瑠太

    日本物理学会講演概要集(CD-ROM)   Vol. 78 ( 2 )   2023

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  2. Direct Dark Matter Search with XENONnT and Future Prospects

    山下雅樹

    日本物理学会講演概要集(CD-ROM)   Vol. 77 ( 2 )   2022

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  3. Development of dual-phase xenon TPC with a hermetic quartz chamber for future direct dark matter experiments

    原田莉奈, 青山直樹, 山崎里奈, 山下雅樹, 伊藤好孝, 伊藤好孝, 風間慎吾, 風間慎吾

    日本物理学会講演概要集(CD-ROM)   Vol. 76 ( 1 )   2021

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  4. 暗黒物質直接探索実験XENON1Tによる電子反跳事象の超過の観測とその展望

    風間 慎吾, 山下 雅樹

    高エネルギーニュース   Vol. 39 ( 3 ) page: 142 - 150   2020

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    Language:Japanese   Publisher:大穂町 (茨城県) : 高エネルギー同好会ニュース編集部  

    Other Link: https://ndlsearch.ndl.go.jp/books/R000000004-I033276821

  5. Japan in the XENONnT Experiment: Overview

    Martens Kai, 雅樹 山下, 好孝 伊藤, 龍一 上野, 樹 奥井, 公祐 尾崎, 慎吾 風間, 伸行 加藤, 敦 竹田, 勤 陳育, 克樹 平出, 賢太朗 身内, 彗太 水越, 茂栄 森山, 里奈 山崎, 他 XENON

    Meeting Abstracts of the Physical Society of Japan   Vol. 74.2   page: 271 - 271   2019

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    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.74.2.0_271

    CiNii Research

  6. Improved search for two-neutrino double electron capture on Xe-124 and Xe-126 using particle identification in XMASS-I

    Abe K, Hiraide K, Ichimura K, Kishimoto Y, Kobayashi K, Kobayashi M, Moriyama S, Nakahata M, Norita T, Ogawa H, Sato K, Sekiya H, Takachio O, Takeda A, Tasaka S, Yamashita M, Yang B. S, Kim N. Y, Kim Y. D, Itow Y, Kanzawa K, Kegasa R, Masuda K, Takiya H, Fushimi K, Kanzaki G, Martens K, Suzuki Y, Xu B. D, Fujita R, Hosokawa K, Miuchi K, Oka N, Takeuchi Y, Kim Y. H, Lee K. B, Lee M. K, Fukuda Y, Miyasaka M, Nishijima K, Nakamura S

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS   Vol. 2018 ( 5 )   2018.5

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    Language:English   Publishing type:Rapid communication, short report, research note, etc. (scientific journal)  

    DOI: 10.1093/ptep/pty053

    Scopus

  7. 宇宙暗黒物質を探す (特集 物理科学,この1年) -- (素粒子物理)

    山下 雅樹

    パリティ   Vol. 30 ( 1 ) page: 29 - 31   2015.1

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    Language:Japanese   Publisher:丸善  

    CiNii Research

  8. 液体キセノンで暗黒物質を捕まえる—Liquid xenon detector joins the search for dark matter

    Bertram Schwarzschild, 山下 雅樹

    パリティ = Parity : 物理科学雑誌   Vol. 23 ( 3 ) page: 33 - 37   2008.3

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    Language:Japanese   Publisher:丸善  

    記事種別: 翻訳

    CiNii Research

  9. PTFE Reflector for Liquid Xe scintillator

    Kawasaki K., Yamashita M., Suzuki S., Kikuchi J., Doke T.

    Meeting abstracts of the Physical Society of Japan   Vol. 56 ( 1 ) page: 112 - 112   2001.3

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    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    CiNii Research

  10. XMASS experiment II : Liquid xenon detector for dark matter seartch

    Yamashita Masaki

    Meeting Abstracts of the Physical Society of Japan   Vol. 56.1.1   page: 77   2001

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    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.56.1.1.0_77_3

    CiNii Research

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KAKENHI (Grants-in-Aid for Scientific Research) 14

  1. 中性子パルス発生装置で較正するXENONnTによるダークマター探索の遂行

    Grant number:25H00628  2025.4 - 2030.3

    日本学術振興会  科学研究費助成事業  基盤研究(A)

    森山 茂栄, 山下 雅樹, 竹田 敦, 吉田 将, 山下 雅樹, 竹田 敦, 吉田 将

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    Authorship:Coinvestigator(s) 

    ダークマターの発見とその正体の解明は重要である。その有力候補であるWeakly Interacting Massive Particle (WIMP)を発見するには、WIMPが与える信号や背景事象を模擬し検出器を較正することが重要だ。較正のために用いる中性子パルス発生装置に加え、本研究で新しく開発する中性子の反射材を兼ねた重水素化プラスチックシンチレーターを活用する。それを基に現在の制限より約10倍の感度の改善を行い、世界初の発見とその背後の物理の解明へ向けた研究を遂行する。なお、プラスチックシンチレーターを重水素化することは検出器の較正に最適なエネルギーを持つ中性子を得るために必須である。

  2. Dark matter search iin XENONnT and studies towarding a next generation large liquid xenon experiment.

    Grant number:24H00223  2024.4 - 2028.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

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    Authorship:Coinvestigator(s) 

  3. Dark Matter and new particle searches with a large liqud xenon detector

    Grant number:22H00127  2022.4 - 2026.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

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    Authorship:Principal investigator 

    Grant amount:\42250000 ( Direct Cost: \32500000 、 Indirect Cost:\9750000 )

  4. Study of new physics with electron-recoil events in the XENONnt and further breakthrough with a hermetic liquid xenon TPC

    Grant number:21H04466  2021.4 - 2025.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

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    Authorship:Coinvestigator(s) 

  5. Development of ultra-low background technology for future direct dark matter detection experiments

    Grant number:20H01931  2020.4 - 2023.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Kazama Shingo

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    Authorship:Coinvestigator(s) 

    For the discovery of dark matter with TeV-scale mass and very small interaction cross-section of 1e-48cm2, it is essential to realize an extremely low radioactivity environment that eliminates all background events such as neutrons and radioactive radon. In this study, we developed a new photodetector utilizing both a photomultiplier tube (PMT) and a silicon semiconductor photodetector (MPPC) to reduce neutron BG. We also developed a sealed liquid xenon detector using high-purity quartz glass, and investigated the possibility of eliminating radioactive radon.

  6. Direct Search for Dark Matter with High-Sensitivity Large-Scale Detectors

    Grant number:19H05805  2019.6 - 2024.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    Shigetaka Moriyama

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    Authorship:Coinvestigator(s) 

    The construction and operation of the world's most sensitive dark matter search detector, XENONnT, was achieved. This led to a successful dark-matter search, surpassing the sensitivity of its predecessor experiment XENON1T, from its initial data. Through this research program, a neutron detector based on the technology of the Super-Kamiokande group has been installed, taking advantage of the collaboration in the area, to significantly suppress background events caused by neutrons, and it has been shown that the performance is as planned. Future maintenance of the liquid xenon detector part will enable the performance to reach the initial target sensitivity of 2×10-48 cm2 for the scattering cross-section of dark matter and nucleons. This research program was completed as planned, including the publication of the final results of the XMASS experiment.

  7. The search for double beta decay with a dark matter detector

    Grant number:19H01920  2019.4 - 2022.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    Yamashita Masaki

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    Authorship:Principal investigator 

    Grant amount:\13260000 ( Direct Cost: \10200000 、 Indirect Cost:\3060000 )

    Xe-136 is a candidate nucleus for neutrino-less double beta decay. Direct dark matter search detectors using unenriched Xe, taking advantage of the low background and high energy resolution characteristics of the two-phase xenon TPC detector, was used in this study. A 0νββ search was performed using XENON1T data: 36.16 kg/yr, and a lower limit of half-life 1.2×10-24 yr was obtained at 90% CL. A lower limit of 1.2×10-24 years was obtained at 90% CL. The sensitivity of the working XENONnT detector was estimated: assuming 275 kg/yr of data, the expected sensitivity was 90% CL with a half-life > 2.1 × 10-25 years.

  8. World-best sensitive direct dark-matter search and its imporovement

    Grant number:18H03697  2018.4 - 2021.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    Shigetaka Moriyama

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    Authorship:Coinvestigator(s) 

    We participated in the international research group XENON, which aims to directly detect dark matter, one of the universe's great mysteries. We constructed and operated the XENONnT detector, which is expected to search for dark matter with the highest sensitivity in the world. The sensitivity to search for dark matter and nucleons with a cross-section of 1.6x10-48cm2 was achieved through this research. More specifically, in collaboration with Columbia University and others, 10 tons of liquid xenon was purified in liquid form, and an electron lifetime of 13 ms was achieved to maximize the detector's performance. A radon concentration of 1.7 microBq/kg was also achieved. We investigated the electron event exceedance phenomenon that showed signs in the XENON1T experiment.

  9. R&D of a resonant cavity for dark matter axion search with photonics crystal technique

    2017.4 - 2020.3

    Grant-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research(B)

  10. Development of low mass dark matter detector

    Grant number:17H05197  2017.4 - 2019.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

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    Authorship:Principal investigator 

    Grant amount:\6240000 ( Direct Cost: \4800000 、 Indirect Cost:\1440000 )

  11. Study of Rn removal for dark matter search

    Grant number:16H03973  2016.4 - 2019.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    Yamashita Masaki, TAKEDA Atsushi, HIRAIDE Katsuki, ICHIMURA Koichi, TAKEUCHI Yasuo, KOBAYAHI Masatoshi, TAKEDA Atsushi, HIRAIDE Katsuki, ICHIMURA Koichi, TAKEUCHI Yasuo, KOBAYAHI Masatoshi

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    Authorship:Principal investigator 

    Grant amount:\17160000 ( Direct Cost: \13200000 、 Indirect Cost:\3960000 )

    A radioactive Rn is one of the major background for the direct dark matter search experiment that uses a liquid xenon as a detector medium. The purpose of this study is to develop a Rn removal system in xenon gas to improve the detector sensitivity for the dark matter search. We tested several porous material and the result showed that nano-material (company A) and the porous silica achieved about 90% Rn removal at low temperature (-100℃). The radon removal system was adapted with XMASS-I detector and we could achieve a lowest background in the detector, however, the effect was not as good as we expected. Due to this fact, the origin of Rn source can be different location from we expected and think that this will become an important information for future search.

  12. A Search for Dark Matter

    Grant number:24244025  2012.4 - 2015.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)  Grant-in-Aid for Scientific Research (A)

    SUZUKI Yoichiro, MORIYAMA Shigetaka, NAKAHATA Masayuki, KISHIMOTO Yasuhiro, YAMASHITA Masaki, MARTENS Kai, TAKEDA Atsushi, ABE Kou, SEKIYA Hiroyuki, OGAWA Hiroshi, KOBAYASHI Kazuyoshi, HIRAIDE Katsuki, LIU Jing, YANG Byeongsu, NAKAMURA Shogo, NISHIJIMA Kyoji, ITOW Yoshitaka, MASUDA Kimiaki, TAKEUCHI Yasuo, MIUCHI Kentaro, FUKUDA Yoshiyuki, TASAKA Shigeki, MORIYAMA Shigetaka, NAKAHATA Masayuki, KISHIMOTO Yasuhiro, YAMASHITA Masaki, MARTENS Kai, TAKEDA Atsushi, ABE Kou, SEKIYA Hiroyuki, OGAWA Hiroshi, KOBAYASHI Kazuyoshi, HIRAIDE Katsuki, LIU Jing, YANG Byeongsu, NAKAMURA Shogo, NISHIJIMA Kyoji, ITOW Yoshitaka, MASUDA Kimiaki, TAKEUCHI Yasuo, MIUCHI Kentaro, FUKUDA Yoshiyuki, TASAKA Shigeki

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    Authorship:Collaborating Investigator(s) (not designated on Grant-in-Aid) 

    We know that there exists unknown matter in the universe called dark matter that amounts 5 to 6 times more than the ordinary matter. However, we do not know what they are. There are varieties of candidates for dark matter. Some interact with the ordinary matter and kick out the nucleus and some emit gamma rays when they hit the target material of the detector. Our detector, using 835 kg of liquid xenon as a target material has a characteristics of having very low energy threshold and the ability to detect e/gamma events as well as nuclear recoils. Therefore we are able to make high sensitive searches for low mass dark matter and a new type of dark matter that emits gamma rays. After the observation lasted more than one year, we could not find dark matter, but set very stringent limits for those candidates. We have also demonstrated that we are able to make the detector bigger and be able to achieve much higher sensitive searches in future.

  13. Study of developing dark matter search detector by using multi target materials

    Grant number:20549001  2008 - 2010

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    YAMASHITA Masaki

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    Authorship:Principal investigator 

    Grant amount:\3950000 ( Direct Cost: \3500000 、 Indirect Cost:\450000 )

    Dark Matter is one of the biggest problems in our universe, however, whose existence is supported by several observations. Many of direct dark matter search experiments are undergoing and one group reported the annual modulation due to dark matter signal, although this result was excluded by several experiments. The difference rate in summer and winter is a few percent. The goal of this study is to establish more robust signature of dark matter signal by using different detector materials that enables us to see more than two times difference in the rate and the study supports this possibility in the future.

  14. Study of Dark Matter

    Grant number:19GS0204  2007 - 2011

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Creative Scientific Research  Grant-in-Aid for Creative Scientific Research

    SUZUKI Yoichiro, MORIYAMA Shigetaka, NAKAHATA Masayuki, KOSHIO Yuusuke, NAKAMURA Syogo, TAKEUCHI Yasuo, KISIMOTO Yasuhiro, TAKEDA Atsushi, ABE Kou, SEKIYA Hiroyuki, YAMASHITA Masaki, OGAWA Hiroshi, KOBAYASHI Kazuyoshi, HIRAIDE Katsuki, MORIYAMA Shigetaka, NAKAHATA Masayuki, KOSHIO Yuusuke, NAKAMURA Syogo, TAKEUCHI Yasuo, KISIMOTO Yasuhiro, TAKEDA Atsushi, ABE Kou, SEKIYA Hiroyuki, YAMASHITA Masaki, OGAWA Hiroshi, KOBAYASHI Kazuyoshi, HIRAIDE Katsuki

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    Authorship:Collaborating Investigator(s) (not designated on Grant-in-Aid) 

    We have succeeded to construct the world largest liquid Xenon detector in order to make an observation of Dark Matter in the laboratory experiment. By the calibration data to understand the detector revealed that we have large light yields which shows the high sensitivity for the dark matter search. We have also succeeded to reduce the most serious background of Kr to the level of 2. 7 ppt which is the world lowest background level achieved. The most of the source of backgrounds are identified and we are ready to make an observation.

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Social Contribution 1

  1. Breakin’ Art x Science at Swiss Pavilion, Expo 2025 Osaka 2025

    Role(s):Appearance

    Swiss Embassy  Breakin’ Art x Science at Swiss Pavilion, Expo 2025 Osaka  2025.9