研究者詳細 - 毛受　弘彰

論文 - 毛受　弘彰

分割表示 91 件中 21 - 40 件目／全件表示 >>

Search for Boosted Dark Matter in Super-Kamiokande with low-energy electrons 国際共著国際誌 Open Access

Iovine N., Abe K., Bronner C., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakano Y., Nakahata M., Nakayama S., Noguchi Y., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Tomiya T., Wang X., Yoshida S., Fernandez P., Labarga L., Ospina N., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Locke S., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Lee S.H., Moon D.H., Park R.G., Bodur B., Scholberg K., Walter C.W., Beauchene A., Drapier O., Giampaolo A., Mueller T.A., Santos A.D., Paganini P., Quilain B., Nakamura T., Jang J.S., Machado L.N., Learned J.G., Choi K., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Langella A., De Rosa G., Collazuol G., Iacob F., Mattiazzi M., Ludovici L., Gonin M., Pronost G., Fujisawa C., Maekawa Y., Nishimura Y., Okazaki R., Akutsu R., Friend M.

Proceedings of Science 444 巻 2024年9月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Proceedings of Science

Despite efforts from numerous experiments to grasp the nature of dark matter, no convincing dark matter signal has been observed so far and the very properties of this invisible matter remain unknown. Nevertheless, strong constraints on these properties are set by current observations, particularly for GeV to TeV WIMP-like dark matter particles. In contrast, sub-GeV dark matter scenarios are largely unexplored and still offer promising prospects for dark matter detection. In this contribution, we conduct a search for low-energy electrons scattered by boosted dark matter particles in the Super-Kamiokande detector. In particular, a two-component dark matter scenario is considered, which results in a natural boosting of the non-secluded secondary dark matter particles produced by the decay or annihilation of the dominant cold dark matter component. This work focuses on boosted dark matter from the centre of our Galaxy, with scattered electron energies ranging from a few MeV to a few hundred of MeV. We present the first sensitivities of such low-energy boosted dark matter search using Super-Kamiokande.

DOI： 10.22323/1.444.1365

Research on the development of stereoscopic contents for experiencing cosmic ray air showers and information provision methods. 国際誌 Open Access

Tomida T., Kayama M., Abe Y., Ohkura H., Kajita H.C., Ikeda D., Menjo H., Kanai Y., Takahashi K.

Proceedings of Science 444 巻 2024年9月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Proceedings of Science

Air showers caused by high-energy cosmic rays are very large-scale natural phenomena in which a single particle interacts with an atmospheric nucleus and grows into hundreds of billions of particles on the ground. The air showers appear to reach the ground from an altitude of about 10 km, and their footprint on the ground is several kilometers in diameter. Despite this dynamic and interesting phenomenon, it is not well known to the general public. Most cosmic ray exhibits in science museums are based on real-time detection of natural radiation on the ground, and there are very few ways to convey the fascination of cosmic ray air showers. Therefore, we developed interactive content that shows cosmic ray air showers in a three-dimensional global panoramic image space. This content will be used in science museum exhibitions and educational events to promote awareness of cosmic rays. If the person experiencing the developed tool is interested in cosmic rays, explanatory video content will also be created to provide more detailed information about cosmic rays. The video content was published on YouTube by influencers. In this report, we will introduce the content of the air shower experience and discuss new information dissemination methods using the number of hits from the experience content to the explanatory video as a reference.

DOI： 10.22323/1.444.1605

Performances of the LHCf Arm1 detector during √s=13.6 TeV p- p operation in 2022 国際共著国際誌 Open Access

Kitagami Y., Adriani O., Berti E., Betti P., Bonechi L., Bongi M., D’Alessandro R., Detti S., Haguenauer M., Itow Y., Kasahara K., Kondo M., Matsubara Y., Menjo H., Muraki Y., Ohashi K., Papini P., Piparo G., Ricciarini S., Sako T., Sakurai N., Scaringella M., Shimizu Y., Tamura T., Tiberio A., Torii S., Tricomi A., Turner W.C., Yoshida K.

Proceedings of Science 444 巻 2024年9月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Proceedings of Science

The LHCf experiment obtained the data in the operation with pp collisions at √s = 13.6 TeV in 2022. The statistics is 10 times larger than that of the previous operation in 2015. This large statistics data allow us to measure the production of strange mesons like η and K0, and it will improve hadronic interaction models commonly used for simulations of air showers produced by ultra-high energy cosmic rays. The energy scale is one of the most important parameters for analyses of differential production cross-section measurements with the LHCf detectors. This paper presents the stability of the energy scale of the Arm1 detector during the operation in 2022 by using the reconstructed invariant mass of the π0 meson. As a result, we confirmed that the stability is about 1%.

DOI： 10.22323/1.444.0483

Measurement of the very forward π<sup>0</sup> and η meson productions in p-p collisions at <sup>√</sup>s = 13 TeV with the LHCf detector 国際共著国際誌 Open Access

Piparo G., Adriani O., Berti E., Betti P., Bonechi L., Bongi M., D’Alessandro R., Detti S., Haguenauer M., Itow Y., Kasahara K., Kitagami Y., Kondo M., Matsubara Y., Menjo H., Muraki Y., Ohashi K., Papini P., Ricciarini S., Sako T., Sakurai N., Scaringella M., Shimizu Y., Silveri L., Tamura T., Tiberio A., Torii S., Tricomi A., Turner W.C., Yoshida K.

Proceedings of Science 444 巻 2024年9月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Proceedings of Science

The Large Hadron Collider forward (LHCf) experiment was designed to measure the production of neutral particles in the forward region of the CERN Large Hadron Collider (LHC) interactions. The goal of the experiment is to provide precise measurements of these particles to improve the understanding of ultra-high energy cosmic ray (UHECR) interactions with the Earth atmosphere. In this work, we would like to present the latest LHCf results relative to the measurement of the forward π0 and η meson productions in proton-proton collisions at √s = 13 TeV. This is the first observation of η mesons in the forward region of high-energy collisions. The measurements of the two meson productions play a crucial role in calibrating hadronic interaction models widely used in the simulation of the UHECR interactions with the atmosphere.

DOI： 10.22323/1.444.0447

Measurement of the kaon to pion production ratio with the Super-Kamiokande 国際共著国際誌 Open Access

Tada T., Nakano Y., Koshio Y., Abe K., Bronner C., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakano Y., Nakahata M., Nakayama S., Noguchi Y., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Tomiya T., Wang X., Yoshida S., Fernandez P., Labarga L., Ospina N., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Locke S., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Lee S.H., Moon D.H., Park R.G., Bodur B., Scholberg K., Walter C.W., Beauchêne A., Drapier O., Giampaolo A., Mueller T.A., Santos A.D., Paganini P., Quilain B., Nakamura T., Jang J.S., Machado L.N., Learned J.G., Choi K., Iovine N., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Langella A., De Rosa G., Collazuol G., Iacob F., Mattiazzi M., Ludovici L., Gonin M., Pronost G., Fujisawa C., Maekawa Y., Nishimura Y., Okazaki R.

Proceedings of Science 444 巻 2024年9月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Proceedings of Science

Cosmic-ray muons are generated from the decay of mesons which are secondary particles produced via hadronic interaction between primary cosmic-ray particles and atmospheric nuclei at the upper the atmosphere. The mesons such pions and kaons mostly decay into muons immediately, reflecting the details of the hadronic interactions depending on their energy and lifetime. The modulation of the cosmic-ray muon rate as well as the flux and the atmospheric kaon-to-pion production ratio are important to determine the flux and energy of the atmospheric neutrino. In particular, the kaon-to-pion production ratio rK/π is measured with the correlation coefficient αT between the cosmic-ray muon rate in the underground detector and the atmospheric temperature. As a result, we obtained the correlation coefficient rK/π = 0.85 ± 0.01 (statistical uncertainty only) and rK/π = 0.12 ± 0.03 (statistical uncertainty only) using the data taken in 10 years at the Super-Kamiokande detector. In this article, we report the current status of measurement of the modulation of the comic-ray muon and the atmospheric kaon-to-pion production ratio.

DOI： 10.22323/1.444.0214

Measurement of the charge ratio and polarization of cosmic-ray muon using the tagged decay-e events in Super-Kamiokande 国際共著国際誌 Open Access

Nakano Y., Tada T., Kitagawa H., Koshio Y., Abe K., Bronner C., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakano Y., Nakahata M., Nakayama S., Noguchi Y., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Tomiya T., Wang X., Yoshida S., Fernandez P., Labarga L., Ospina N., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Locke S., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Lee S.H., Moon D.H., Park R.G., Bodur B., Scholberg K., Walter C.W., Beauchêne A., Drapier O., Giampaolo A., Mueller T.A., Santos A.D., Paganini P., Quilain B., Nakamura T., Jang J.S., Machado L.N., Learned J.G., Choi K., Iovine N., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Langella A., De Rosa G., Collazuol G., Iacob F., Mattiazzi M., Ludovici L., Gonin M., Pronost G., Fujisawa C., Maekawa Y., Nishimura Y.

Proceedings of Science 444 巻 2024年9月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Proceedings of Science

Neutrinos and muons from cosmic-ray interactions in the atmosphere originate from mesons, such as pions and kaons, in air-showers. An accuracy of the absolute atmospheric neutrino flux and its flavor ratio are limited due to the uncertainty of meson productions in hadronic interaction models. In order to reduce such uncertainty, measurements of the charge ratio and the polarization of cosmic-ray muons are important as new inputs to theoretical models which simulate the atmospheric neutrino flux. In this proceedings, we present the results of the charge ratio (R) and polarization (Pμ0) of cosmic-ray muon measurements using the decay electrons collected from 2008 September to 2022 June by the Super-Kamiokande (SK) detector. We measured muon charge ratio to be R = 1.32±0.02 (stat.+syst.) and the muon polarization at the production location to be Pμ0 = 0.52±0.01 (stat.+syst.). The SK detector uniquely measured the polarization of cosmic-ray muons with energies more than 1 TeV at sea-level because of its underground location.

DOI： 10.22323/1.444.0212

New methods and simulations for cosmogenic induced spallation removal in Super-Kamiokande-IV 査読有り国際共著国際誌

Locke S., Coffani A., Abe K., Bronner C., Hayato Y., Ikeda M., Imaizumi S., Ito H., Kameda J., Kataoka Y., Miura M., Moriyama S., Nagao Y., Nakahata M., Nakajima Y., Nakayama S., Okada T., Okamoto K., Orii A., Pronost G., Sekiya H., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Takenaka A., Tanaka H., Yano T., Hirade K., Kanemura Y., Miki S., Watabe S., Han S., Kajita T., Okumura K., Tashiro T., Xia J., Wang X., Megias G.D., Bravo-Berguño D., Labarga L., Marti L., Zaldivar B., Pointon B.W., Blaszczyk F.D.M., Kearns E., Raaf J.L., Stone J.L., Wan L., Wester T., Bian J., Griskevich N.J., Kropp W.R., Mine S., Smy M.B., Sobel H.W., Takhistov V., Weatherly P., Yankelevich A., Hill J., Kim J.Y., Lim I.T., Park R.G., Bodur B., Scholberg K., Walter C.W., Bernard L., Drapier O., Hedri S.E., Giampaolo A., Gonin M., Mueller T.A., Paganini P., Quilain B., Santos A.D., Ishizuka T., Nakamura T., Jang J.S., Learned J.G., Anthony L.H.V., Sztuc A.A., Uchida Y., Martin D., Scott M., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Machado L.N., De Rosa G., Collazuol G., Iacob F., Lamoureux M., Ospina N., Mattiazzi M., Ludovici L., Nishimura Y., Maewaka Y., Cao S.

Physical Review D ( 3 ) 2024年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Physical Review D

Radioactivity induced by cosmic muon spallation is a dominant source of backgrounds for O(10 MeV) neutrino interactions in water Cherenkov detectors. In particular, it is crucial to reduce backgrounds to measure the solar neutrino spectrum and find neutrino interactions from distant supernovae. In this paper we introduce new techniques to locate muon-induced hadronic showers and efficiently reject spallation backgrounds. Applying these techniques to the solar neutrino analysis with an exposure of 2790×22.5 kton·day increases the signal efficiency by 12.6%, approximately corresponding to an additional year of detector running. Furthermore, we present the first spallation simulation at Super-Kamiokande, where we model hadronic interactions using fluka. The agreement between the isotope yields and shower pattern in this simulation and in the data gives confidence in the accuracy of this simulation, and thus opens the door to use it to optimize muon spallation removal in new data with gadolinium-enhanced neutron capture detection.

DOI： 10.1103/PhysRevD.110.032003

Second gadolinium loading to Super-Kamiokande 査読有り国際共著国際誌 Open Access

Abe, K; Bronner, C; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kaneshima, R; Kashiwagi, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakano, Y; Nakahata, M; Nakayama, S; Noguchi, Y; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Tanaka, H; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Yoshida, S; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Pointon, BW; Kearns, E; Raaf, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Smy, MB; Sobel, HW; Takhistov, V; Yankelevich, A; Hill, J; Jang, MC; Lee, SH; Moon, DH; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Beauchêne, A; Drapier, O; Giampaolo, A; Mueller, TA; Santos, AD; Paganini, P; Quilain, B; Rogly, R; Nakamura, T; Jang, JS; Machado, LN; Learned, JG; Choi, K; Iovine, N; Cao, S; Anthony, LHV; Martin, D; Prouse, NW; Scott, M; Uchida, Y; Berardi, V; Calabria, NF; Catanesi, MG; Radicioni, E; Langella, A; De Rosa, G; Collazuol, G; Iacob, F; Mattiazzi, M; Ludovici, L; Gonin, M; Périssé, L; Pronost, G; Fujisawa, C; Maekawa, Y; Nishimura, Y; Okazaki, R; Akutsu, R; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Bhuiyan, N; Burton, GT; Di Lodovico, F; Gao, J; Goldsack, A; Katori, T; Migenda, J; Ramsden, RM; Xie, Z; Zsoldos, S; Suzuki, AT; Takagi, Y; Takeuchi, Y; Zhong, H; Feng, J; Feng, L; Hu, JR; Hu, Z; Kawaue, M; Kikawa, T; Mori, M; Nakaya, T; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Mehta, P; Tarant, A; Wilking, MJ; Fukuda, Y; Itow, Y; Menjo, H; Ninomiya, K; Yoshioka, Y; Lagoda, J; Mandal, M; Mijakowski, P; Prabhu, YS; Zalipska, J; Jia, M; Jiang, J; Shi, W; Yanagisawa, C; Harada, M; Hino, Y; Ishino, H; Koshio, Y; Nakanishi, F; Sakai, S; Tada, T; Tano, T; Ishizuka, T; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Holin, A; Nova, F; Jung, S; Yang, BS; Yang, JY; Yoo, J; Fannon, JEP; Kneale, L; Malek, M; McElwee, JM; Thiesse, MD; Thompson, LF; Wilson, ST; Okazawa, H; Lakshmi, SM; Kim, SB; Kwon, E; Seo, JW; Yu, I; Ichikawa, AK; Nakamura, K; Tairafune, S; Nishijima, K; Eguchi, A; Nakagiri, K; Nakajima, Y; Shima, S; Taniuchi, N; Watanabe, E; Yokoyama, M; de Perio, P; Fujita, S; Jesús-Valls, C; Martens, K; Tsui, KM; Vagins, MR; Xia, J; Izumiyama, S; Kuze, M; Matsumoto, R; Terada, K; Ishitsuka, M; Ito, H; Ommura, Y; Shigeta, N; Shinoki, M; Yamauchi, K; Yoshida, T; Gaur, R; Gousy-Leblanc, V; Hartz, M; Konaka, A; Li, X; Chen, S; Xu, BD; Zhang, B; Posiadala-Zezula, M; Boyd, SB; Edwards, R; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Amanai, S; Marti, L; Minamino, A; Suzuki, S; Scovell, PR; Meehan, E; Bandac, I; Peña-Garay, C; Pérez, J; Gileva, O; Lee, EK; Leonard, DS; Sakakieda, Y; Sakaguchi, A; Sueki, K; Takaku, Y; Yamasaki, S

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 1065 巻 2024年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

The first loading of gadolinium (Gd) into Super-Kamiokande in 2020 was successful, and the neutron capture efficiency on Gd reached 50%. To further increase the Gd neutron capture efficiency to 75%, 26.1 tons of Gd2(SO4)3⋅8H2O was additionally loaded into Super-Kamiokande (SK) from May 31 to July 4, 2022. As the amount of loaded Gd2(SO4)3⋅8H2O was doubled compared to the first loading, the capacity of the powder dissolving system was doubled. We also developed new batches of gadolinium sulfate with even further reduced radioactive impurities. In addition, a more efficient screening method was devised and implemented to evaluate these new batches of Gd2(SO4)3⋅8H2O. Following the second loading, the Gd concentration in SK was measured to be 333.5±2.5 ppm via an Atomic Absorption Spectrometer (AAS). From the mean neutron capture time constant of neutrons from an Am/Be calibration source, the Gd concentration was independently measured to be 332.7 ± 6.8(sys.) ± 1.1(stat.) ppm, consistent with the AAS result. Furthermore, during the loading the Gd concentration was monitored continually using the capture time constant of each spallation neutron produced by cosmic-ray muons, and the final neutron capture efficiency was shown to become 1.5 times higher than that of the first loaded phase, as expected.

DOI： 10.1016/j.nima.2024.169480

Performance of SK-Gd's Upgraded Real-time Supernova Monitoring System 査読有り国際共著国際誌 Open Access

Kashiwagi, Y; Abe, K; Bronner, C; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kaneshima, R; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakano, Y; Nakahata, M; Nakayama, S; Noguchi, Y; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Tanaka, H; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Yoshida, S; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Pointon, BW; Kearns, E; Raaf, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Locke, S; Smy, MB; Sobel, HW; Takhistov, V; Yankelevich, A; Hill, J; Jang, MC; Lee, SH; Moon, DH; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Beauchêne, A; Drapier, O; Giampaolo, A; Mueller, TA; Santos, AD; Paganini, P; Quilain, B; Rogly, R; Nakamura, T; Jang, JS; Machado, LN; Learned, JG; Choi, K; Iovine, N; Cao, S; Anthony, LHV; Martin, D; Prouse, NW; Scott, M; Sztuc, AA; Uchida, Y; Berardi, V; Catanesi, MG; Radicioni, E; Calabria, NF; Langella, A; De Rosa, G; Collazuol, G; Iacob, F; Mattiazzi, M; Ludovici, L; Gonin, M; Périssé, L; Pronost, G; Fujisawa, C; Maekawa, Y; Nishimura, Y; Okazaki, R; Akutsu, R; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Bhuiyan, N; Burton, GT; Di Lodovico, F; Gao, J; Goldsack, A; Katori, T; Migenda, J; Ramsden, RM; Xie, Z; Zsoldos, S; Suzuki, AT; Takagi, Y; Takeuchi, Y; Zhong, H; Feng, J; Feng, L; Hu, JR; Hu, Z; Kawaue, M; Kikawa, T; Mori, M; Nakaya, T; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Mehta, P; Tarrant, A; Fukuda, Y; Itow, Y; Menjo, H; Ninomiya, K; Yoshioka, Y; Lagoda, J; Lakshmi, SM; Mandal, M; Mijakowski, P; Prabhu, YS; Zalipska, J; Jia, M; Jiang, J; Jung, CK; Shi, W; Wilking, MJ; Yanagisawa, C; Harada, M; Hino, Y; Ishino, H; Koshio, Y; Nakanishi, F; Sakai, S; Tada, T; Tano, T; Ishizuka, T; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Holin, A; Nova, F; Jung, S; Yang, BS; Yang, JY; Yoo, J; Fannon, JEP; Kneale, L; Malek, M; McElwee, JM; Thiesse, MD; Thompson, LF; Wilson, ST; Okazawa, H; Kim, SB; Kwon, E; Seo, JW; Yu, I; Ichikawa, AK; Nakamura, KD; Tairafune, S; Nishijima, K; Eguchi, A; Nakagiri, K; Nakajima, Y; Shima, S; Taniuchi, N; Watanabe, E; Yokoyama, M; de Perio, P; Fujita, S; Jesús-Valls, C; Martens, K; Tsui, KM; Vagins, MR; Xia, J; Kuze, M; Izumiyama, S; Matsumoto, R; Ishitsuka, M; Ito, H; Ommura, Y; Shigeta, N; Shinoki, M; Yamauchi, K; Yoshida, T; Gaur, R; Gousy-Leblanc, V; Hartz, M; Konaka, A; Li, X; Chen, S; Xu, BD; Zhang, B; Posiadala-Zezula, M; Boyd, SB; Edwards, R; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Amanai, S; Marti, L; Minamino, A; Suzuki, S

ASTROPHYSICAL JOURNAL 970 巻 ( 1 ) 2024年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Astrophysical Journal

Among multimessenger observations of the next Galactic core-collapse supernova, Super-Kamiokande (SK) plays a critical role in detecting the emitted supernova neutrinos, determining the direction to the supernova (SN), and notifying the astronomical community of these observations in advance of the optical signal. In 2022, SK has increased the gadolinium dissolved in its water target (SK-Gd) and has achieved a Gd concentration of 0.033%, resulting in enhanced neutron detection capability, which in turn enables more accurate determination of the supernova direction. Accordingly, SK-Gd’s real-time supernova monitoring system has been upgraded. SK_SN Notice, a warning system that works together with this monitoring system, was released on 2021 December 13, and is available through GCN Notices. When the monitoring system detects an SN-like burst of events, SK_SN Notice will automatically distribute an alarm with the reconstructed direction to the supernova candidate within a few minutes. In this paper, we present a systematic study of SK-Gd’s response to a simulated Galactic SN. Assuming a supernova situated at 10 kpc, neutrino fluxes from six supernova models are used to characterize SK-Gd’s pointing accuracy using the same tools as the online monitoring system. The pointing accuracy is found to vary from 3° to 7° depending on the models. However, if the supernova is closer than 10 kpc, SK_SN Notice can issue an alarm with three-degree accuracy, which will benefit follow-up observations by optical telescopes with large fields of view.

DOI： 10.3847/1538-4357/ad4d8e

Search for Periodic Time Variations of the Solar <SUP>8</SUP>B Neutrino Flux between 1996 and 2018 in Super-Kamiokande 査読有り国際共著国際誌 Open Access

Abe, K; Bronner, C; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kaneshima, R; Kashiwagi, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakano, Y; Nakahata, M; Nakayama, S; Noguchi, Y; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Tanaka, H; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Yoshida, S; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Pointon, BW; Kearns, E; Raaf, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Locke, S; Smy, MB; Sobel, HW; Takhistov, V; Yankelevich, A; Hill, J; Lee, SH; Moon, DH; Park, RG; Jang, MC; Bodur, B; Scholberg, K; Walter, CW; Beauchene, A; Drapier, O; Giampaolo, A; Mueller, TA; Santos, AD; Paganini, P; Quilain, B; Nakamura, T; Jang, JS; Machado, LN; Learned, JG; Choi, K; Iovine, N; Cao, S; Anthony, LHV; Martin, D; Prouse, NW; Scott, M; Sztuc, AA; Uchida, Y; Berardi, V; Catanesi, MG; Radicioni, E; Calabria, NF; Langella, A; De Rosa, G; Collazuol, G; Iacob, F; Mattiazzi, M; Ludovici, L; Gonin, M; Pronost, G; Fujisawa, C; Maekawa, Y; Nishimura, Y; Okazaki, R; Akutsu, R; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Bhuiyan, N; Burton, GT; Di Lodovico, F; Gao, J; Goldsack, A; Katori, T; Migenda, J; Xie, Z; Ramsden, RM; Zsoldos, S; Suzuki, AT; Takagi, Y; Zhong, H; Takeuchi, Y; Feng, J; Feng, L; Hu, JR; Hu, Z; Kikawa, T; Mori, M; Kawaue, M; Nakaya, T; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Mehta, P; Tarant, A; Fukuda, Y; Itow, Y; Menjo, H; Ninomiya, K; Yoshioka, Y; Lagoda, J; Lakshmi, SM; Mandal, M; Mijakowski, P; Prabhu, YS; Zalipska, J; Jia, M; Jiang, J; Jung, CK; Wilking, MJ; Yanagisawa, C; Shi, W; Harada, M; Hino, Y; Ishino, H; Koshio, Y; Nakanishi, F; Sakai, S; Tada, T; Tano, T; Ishizuka, T; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Holin, A; Nova, F; Yang, BS; Yang, JY; Yoo, J; Jung, S; Fannon, JEP; Kneale, L; Malek, M; McElwee, JM; Thiesse, MD; Thompson, LF; Wilson, ST; Okazawa, H; Kim, SB; Kwon, E; Seo, JW; Yu, I; Ichikawa, AK; Nakamura, KD; Tairafune, S; Nishijima, K; Eguchi, A; Nakagiri, K; Nakajima, Y; Shima, S; Taniuchi, N; Watanabe, E; Yokoyama, M; de Perio, P; Fujita, S; Martens, K; Tsui, KM; Vagins, MR; Xia, J; Izumiyama, S; Kuze, M; Matsumoto, R; Ishitsuka, M; Ito, H; Ommura, Y; Shigeta, N; Shinoki, M; Yamauchi, K; Yoshida, T; Gaur, R; Gousy-Leblanc, V; Hartz, M; Konaka, A; Li, X; Chen, S; Xu, BD; Zhang, B; Posiadala-Zezula, M; Boyd, SB; Edwards, R; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Amanai, S; Marti, L; Minamino, A; Suzuki, S

PHYSICAL REVIEW LETTERS 132 巻 ( 24 ) 頁： 241803 2024年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Physical Review Letters

We report a search for time variations of the solar B8 neutrino flux using 5804 live days of Super-Kamiokande data collected between May 31, 1996, and May 30, 2018. Super-Kamiokande measured the precise time of each solar neutrino interaction over 22 calendar years to search for solar neutrino flux modulations with unprecedented precision. Periodic modulations are searched for in a dataset comprising five-day interval solar neutrino flux measurements with a maximum likelihood method. We also applied the Lomb-Scargle method to this dataset to compare it with previous reports. The only significant modulation found is due to the elliptic orbit of the Earth around the Sun. The observed modulation is consistent with astronomical data: we measured an eccentricity of (1.53±0.35)%, and a perihelion shift of (-1.5±13.5) days.

DOI： 10.1103/PhysRevLett.132.241803

Solar neutrino measurements using the full data period of Super-Kamiokande-IV 査読有り国際共著国際誌 Open Access

Abe, K; Bronner, C; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; Ikeda, M; Imaizumi, S; Iyogi, K; Kameda, J; Kanemura, Y; Kaneshima, R; Kashiwagi, Y; Kataoka, Y; Kato, Y; Kishimoto, Y; Miki, S; Mine, S; Miura, M; Mochizuki, T; Moriyama, S; Nagao, Y; Nakahata, M; Nakano, Y; Nakayama, S; Noguchi, Y; Okada, T; Okamoto, K; Orii, A; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Takenaka, A; Tanaka, H; Watanabe, S; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Tomiya, T; Wang, R; Wang, X; Yoshida, S; Bravo-Berguño, D; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Pointon, BW; Blaszczyk, FDM; Kachulis, C; Kearns, E; Raaf, JL; Stone, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Kropp, WR; Locke, S; Smy, MB; Sobel, HW; Takhistov, V; Weatherly, P; Yankelevich, A; Ganezer, KS; Hill, J; Jang, MC; Kim, JY; Lee, S; Lim, IT; Moon, DH; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Beauchêne, A; Bernard, L; Coffani, A; Drapier, O; El Hedri, S; Giampaolo, A; Imber, J; Mueller, TA; Paganini, P; Rogly, R; Quilain, B; Santos, A; Nakamura, T; Jang, JS; Machado, LN; Learned, JG; Matsuno, S; Iovine, N; Choi, K; Cao, S; Anthony, LHV; Litchfield, RP; Prouse, N; Marin, D; Scott, M; Sztuc, AA; Uchida, Y; Berardi, V; Catanesi, MG; Intonti, RA; Radicioni, E; Calabria, NF; De Rosa, G; Langella, A; Collazuol, G; Iacob, F; Lamoureux, M; Mattiazzi, M; Ludovici, L; Gonin, M; Périssé, L; Pronost, G; Fujisawa, C; Maekawa, Y; Nishimura, Y; Okazaki, R; Friend, M; Hasegawa, T; Ishida, T; Jakkapu, M; Kobayashi, T; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Boschi, T; Bhuiyan, N; Burton, GT; Gao, J; Goldsack, A; Katori, T; Di Lodovico, F; Migenda, J; Sedgwick, SM; Ramsden, RM; Taani, M; Xie, Z; Zsoldos, S; Abe, K; Hasegawa, M; Isobe, Y; Kotsar, Y; Miyabe, H; Ozaki, H; Shiozawa, T; Sugimoto, T; Suzuki, AT; Takagi, Y; Takeuchi, Y; Yamamoto, S; Zhong, H; Ashida, Y; Feng, J; Feng, L; Hayashino, T; Hirota, S; Hu, JR; Hu, Z; Jiang, M; Kawaue, M; Kikawa, T; Mori, M; Nakamura, K; Nakaya, T; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Mehta, P; Pritchard, A; Tarrant, A; Wilking, MJ; Fukuda, Y; Itow, Y; Menjo, H; Murase, M; Ninomiya, K; Niwa, T; Tsukada, M; Yoshioka, Y; Frankiewicz, K; Lagoda, J; Mandal, M; Mijakowski, P; Prabhu, YS; Zalipska, J; Jiang, J; Jia, M; Jung, CK; Palomino, JL; Santucci, G; Shi, W; Vilela, C; Yanagisawa, C; Fukuda, D; Hagiwara, K; Harada, M; Hino, Y; Horai, T; Ishino, H; Ito, S; Kitagawa, H; Koshio, Y; Ma, W; Nakanishi, F; Piplani, N; Sakai, S; Sakuda, M; Tada, T; Tano, T; Xu, C; Yamaguchi, R; Ishizuka, T; Kuno, Y; Barr, G; Barrow, D; Cook, L; Samani, S; Simpson, C; Wark, D; Holin, AM; Nova, F; Jung, S; Yang, B; Yang, JY; Yoo, J; Fannon, JEP; Kneale, L; Malek, M; McElwee, JM; Stone, O; Thiesse, MD; Thompson, LF; Wilson, ST; Okazawa, H; Lakshmi, SM; Choi, Y; Kim, SB; Kwon, E; Seo, JW; Yu, I; Ichikawa, AK; Nakamura, K; Tairafune, S; Nishijima, K; Eguchi, A; Iwamoto, K; Nakagiri, K; Nakajima, Y; Ogawa, N; Shima, S; Watanabe, E; Yokoyama, M; Calland, RG; Fujita, S; Jesús-Valls, C; Xia, J; Ming, TK; de Perio, P; Martens, K; Murdoch, M; Vagins, MR; Izumiyama, S; Kuze, M; Matsumoto, R; Okajima, Y; Tanaka, M; Yoshida, T; Inomoto, M; Ishitsuka, M; Ito, H; Kinoshita, T; Matsumoto, R; Ohta, K; Ommura, Y; Shinoki, M; Shigeta, N; Suganuma, T; Yamauchi, K; Yoshida, T; Martin, JF; Nantais, CM; Tanaka, HA; Towstego, T; Gaur, R; Gousy-Leblanc, V; Hartz, M; Konaka, A; Li, X; Chen, S; Xu, BD; Zhang, B; Berkman, S; Posiadala-Zezula, M; Boyd, SB; Edwards, R; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Walker, J; Amanai, S; Marti, L; Minamino, A; Okamoto, K; Pintaudi, G; Sano, S; Sasaki, R; Suzuki, S; Wada, K

PHYSICAL REVIEW D 109 巻 ( 9 ) 2024年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Physical Review D

An analysis of solar neutrino data from the fourth phase of Super-Kamiokande (SK-IV) from October 2008 to May 2018 is performed and the results are presented. The observation time of the dataset of SK-IV corresponds to 2970 days and the total live time for all four phases is 5805 days. For more precise solar neutrino measurements, several improvements are applied in this analysis: lowering the data acquisition threshold in May 2015, further reduction of the spallation background using neutron clustering events, precise energy reconstruction considering the time variation of the PMT gain. The observed number of solar neutrino events in 3.49-19.49 MeV electron kinetic energy region during SK-IV is 65,443-388+390(stat.)±925(syst.) events. Corresponding B8 solar neutrino flux is (2.314±0.014(stat.)±0.040(syst.))×106 cm-2 s-1, assuming a pure electron-neutrino flavor component without neutrino oscillations. The flux combined with all SK phases up to SK-IV is (2.336±0.011(stat.)±0.043(syst.))×106 cm-2 s-1. Based on the neutrino oscillation analysis from all solar experiments, including the SK 5805 days dataset, the best-fit neutrino oscillation parameters are sin2θ12,solar=0.306±0.013 and Δm21,solar2=(6.10-0.81+0.95)×10-5 eV2, with a deviation of about 1.5σ from the Δm212 parameter obtained by KamLAND. The best-fit neutrino oscillation parameters obtained from all solar experiments and KamLAND are sin2θ12,global=0.307±0.012 and Δm21,global2=(7.50-0.18+0.19)×10-5 eV2.

DOI： 10.1103/PhysRevD.109.092001

Atmospheric neutrino oscillation analysis with neutron tagging and an expanded fiducial volume in Super-Kamiokande I-V 査読有り国際共著国際誌 Open Access

Wester, T; Abe, K; Bronner, C; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kaneshima, R; Kashiwagi, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakano, Y; Nakahata, M; Nakayama, S; Noguchi, Y; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Tanaka, H; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Yoshida, S; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Pointon, BW; Kearns, E; Raaf, JL; Wan, L; Bian, J; Griskevich, NJ; Locke, S; Smy, MB; Sobel, HW; Takhistov, V; Yankelevich, A; Hill, J; Lee, SH; Moon, DH; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Beauchêne, A; Drapier, O; Giampaolo, A; Mueller, TA; Santos, AD; Paganini, P; Quilain, B; Nakamura, T; Jang, JS; Machado, LN; Learned, JG; Choi, K; Iovine, N; Cao, S; Anthony, LHV; Martin, D; Prouse, NW; Scott, M; Sztuc, AA; Uchida, Y; Berardi, V; Catanesi, MG; Radicioni, E; Calabria, NF; Langella, A; De Rosa, G; Collazuol, G; Iacob, F; Mattiazzi, M; Ludovici, L; Gonin, M; Pronost, G; Fujisawa, C; Maekawa, Y; Nishimura, Y; Okazaki, R; Akutsu, R; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Bhuiyan, N; Burton, GT; Di Lodovico, F; Gao, J; Goldsack, A; Katori, T; Migenda, J; Ramsden, R; Xie, Z; Zsoldos, S; Suzuki, AT; Takagi, Y; Takeuchi, Y; Zhong, H; Feng, J; Feng, L; Hu, JR; Hu, Z; Kawaue, M; Kikawa, T; Mori, M; Nakaya, T; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Mehta, P; Tarrant, A; Fukuda, Y; Itow, Y; Menjo, H; Ninomiya, K; Lagoda, J; Lakshmi, SM; Mandal, M; Mijakowski, P; Prabhu, YS; Zalipska, J; Jia, M; Jiang, J; Jung, CK; Shi, W; Wilking, MJ; Yanagisawa, C; Harada, M; Hino, Y; Ishino, H; Koshio, Y; Nakanishi, F; Sakai, S; Tada, T; Tano, T; Ishizuka, T; Barr, G; Barrow, D; Cook, L; Holin, A; Nova, F; Samani, S; Wark, D; Jung, S; Yang, BS; Yang, JY; Yoo, J; Fannon, JEP; Kneale, L; Malek, M; McElwee, JM; Thiesse, MD; Thompson, LF; Wilson, ST; Okazawa, H; Kim, SB; Kwon, E; Seo, JW; Yu, I; Ichikawa, AK; Nakamura, KD; Tairafune, S; Nishijima, K; Eguchi, A; Nakagiri, K; Nakajima, Y; Shima, S; Taniuchi, N; Watanabe, E; Yokoyama, M; de Perio, P; Fujita, S; Martens, K; Tsui, KM; Vagins, MR; Xia, J; Izumiyama, S; Kuze, M; Matsumoto, R; Ishitsuka, M; Ito, H; Ommura, Y; Shigeta, N; Shinoki, M; Yamauchi, K; Yoshida, T; Gaur, R; Gousy-Leblanc, V; Hartz, M; Konaka, A; Li, X; Chen, S; Xu, BD; Zhang, B; Posiadala-Zezula, M; Boyd, SB; Edwards, R; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Amanai, S; Marti, L; Minamino, A; Suzuki, S

PHYSICAL REVIEW D 109 巻 ( 7 ) 2024年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Physical Review D

We present a measurement of neutrino oscillation parameters with the Super-Kamiokande detector using atmospheric neutrinos from the complete pure-water SK I-V (April 1996-July 2020) dataset, including events from an expanded fiducial volume. The dataset corresponds to 6511.3 live days and an exposure of 484.2 kiloton-years. Measurements of the neutrino oscillation parameters Δm322, sin2θ23, sin2θ13, δCP, and the preference for the neutrino mass ordering are presented with atmospheric neutrino data alone, and with constraints on sin2θ13 from reactor neutrino experiments. Our analysis including constraints on sin2θ13 favors the normal mass ordering at the 92.3% level.

DOI： 10.1103/PhysRevD.109.072014

Measurement of the neutrino-oxygen neutral-current quasielastic cross section using atmospheric neutrinos in the SK-Gd experiment 査読有り国際共著国際誌 Open Access

Sakai, S; Abe, K; Bronner, C; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kaneshima, R; Kashiwagi, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakano, Y; Nakahata, M; Nakayama, S; Noguchi, Y; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Tanaka, H; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Yoshida, S; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Pointon, BW; Kearns, E; Raaf, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Locke, S; Smy, MB; Sobel, HW; Takhistov, V; Yankelevich, A; Hill, J; Jang, MC; Lee, SH; Moon, DH; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Beauchêne, A; Drapier, O; Giampaolo, A; Mueller, TA; Santos, AD; Paganini, P; Quilain, B; Nakamura, T; Jang, JS; Machado, LN; Learned, JG; Choi, K; Iovine, N; Cao, S; Anthony, LHV; Martin, D; Prouse, NW; Scott, M; Sztuc, AA; Uchida, Y; Berardi, V; Calabria, NF; Catanesi, MG; Radicioni, E; Langella, A; De Rosa, G; Collazuol, G; Iacob, F; Mattiazzi, M; Ludovici, L; Gonin, M; Pronost, G; Fujisawa, C; Maekawa, Y; Nishimura, Y; Okazaki, R; Akutsu, R; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Bhuiyan, N; Burton, GT; Di Lodovico, F; Gao, J; Goldsack, A; Katori, T; Migenda, J; Ramsden, RM; Xie, Z; Zsoldos, S; Suzuki, AT; Takagi, Y; Zhong, H; Takeuchi, Y; Feng, J; Feng, L; Hu, JR; Hu, Z; Kawaue, M; Kikawa, T; Mori, M; Nakaya, T; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Mehta, P; Tarant, A; Fukuda, Y; Itow, Y; Menjo, H; Ninomiya, K; Yoshioka, Y; Lagoda, J; Lakshmi, SM; Mandal, M; Mijakowski, P; Prabhu, YS; Zalipska, J; Jia, M; Jiang, J; Jung, CK; Shi, W; Wilking, MJ; Yanagisawa, C; Harada, M; Hino, Y; Ishino, H; Koshio, Y; Nakanishi, F; Tada, T; Tano, T; Ishizuka, T; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Holin, A; Nova, F; Jung, S; Yang, BS; Yang, JY; Yoo, J; Fannon, JEP; Kneale, L; Malek, M; McElwee, JM; Thiesse, MD; Thompson, LF; Wilson, ST; Okazawa, H; Kim, SB; Kwon, E; Seo, JW; Yu, I; Ichikawa, AK; Nakamura, KD; Tairafune, S; Nishijima, K; Eguchi, A; Nakagiri, K; Nakajima, Y; Shima, S; Taniuchi, N; Watanabe, E; Yokoyama, M; de Perio, P; Fujita, S; Martens, K; Tsui, KM; Vagins, MR; Xia, J; Izumiyama, S; Kuze, M; Matsumoto, R; Ishitsuka, M; Ito, H; Ommura, Y; Shigeta, N; Shinoki, M; Yamauchi, K; Yoshida, T; Gaur, R; Gousy-Leblanc, V; Hartz, M; Konaka, A; Li, X; Chen, S; Xu, BD; Zhang, B; Posiadala-Zezula, M; Boyd, SB; Edwards, R; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Amanai, S; Marti, L; Minamino, A; Suzuki, S

PHYSICAL REVIEW D 109 巻 ( 1 ) 2024年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Physical Review D

We report the first measurement of the atmospheric neutrino-oxygen neutral-current quasielastic (NCQE) cross section in the gadolinium-loaded Super-Kamiokande (SK) water Cherenkov detector. In June 2020, SK began a new experimental phase, named SK-Gd, by loading 0.011% by mass of gadolinium into the ultrapure water of the SK detector. The introduction of gadolinium to ultrapure water has the effect of improving the neutron-tagging efficiency. Using a 552.2 day dataset from August 2020 to June 2022, we measure the NCQE cross section to be 0.74±0.22(stat)-0.15+0.85(syst)×10-38 cm2/oxygen in the energy range from 160 MeV to 10 GeV, which is consistent with the atmospheric neutrino-flux-averaged theoretical NCQE cross section and the measurement in the SK pure-water phase within the uncertainties. Furthermore, we compare the models of the nucleon-nucleus interactions in water and find that the binary cascade model and the Liège intranuclear cascade model provide a somewhat better fit to the observed data than the Bertini cascade model. Since the atmospheric neutrino-oxygen NCQE reactions are one of the main backgrounds in the search for diffuse supernova neutrino background (DSNB), these new results will contribute to future studies - and the potential discovery - of the DSNB in SK.

DOI： 10.1103/PhysRevD.109.L011101

Measurement of the forward η meson production rate in p-p collisions at √s = 13 TeV with the LHCf-Arm2 detector 査読有り国際共著国際誌 Open Access

Adriani O., Berti E., Betti P., Bonechi L., Bongi M., D’Alessandro R., Detti S., Hagenauer M., Itow Y., Kasahara K., Kitagami Y., Kondo M., Matsubara Y., Menjo H., Muraki Y., Ohashi K., Papini P., Piparo G., Ricciarini S., Sako T., Sakurai N., Scaringella M., Shimizu Y., Tamura T., Tiberio A., Torii S., Tricomi A., Turner W.C., Yoshida K.

Journal of High Energy Physics 2023 巻 ( 10 ) 2023年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of High Energy Physics

The forward η mesons production has been observed by the Large Hadron Collider forward (LHCf) experiment in proton-proton collision at s = 13 TeV. This paper presents the measurement of the inclusive production rate of η in pT < 1.1 GeV/c, expressed as a function of the Feynman-x variable. These results are compared with the predictions of several hadronic interaction models commonly used for the modelling of the air showers produced by ultra-high energy cosmic rays. This is both the first measurement of η mesons from LHCf and the first time a particle containing strange quarks has been observed in the forward region for high-energy collisions. These results will provide a powerful constraint on hadronic interaction models for the purpose of improving the understanding of the processes underlying the air showers produced in the Earth’s atmosphere by ultra-energetic cosmic rays.

DOI： 10.1007/JHEP10(2023)169

Search for Astrophysical Electron Antineutrinos in Super-Kamiokande with 0.01% Gadolinium-loaded Water 査読有り国際共著国際誌 Open Access

Harada, M; Abe, K; Bronner, C; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kaneshima, R; Kashiwagi, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakano, Y; Nakahata, M; Nakayama, S; Noguchi, Y; Okamoto, K; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Takenaka, A; Tanaka, H; Watanabe, S; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Yoshida, S; Megias, GD; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Pointon, BW; Kearns, E; Raaf, JL; Wester, T; Bian, J; Griskevich, NJ; Locke, S; Smy, MB; Sobel, HW; Takhistov, V; Yankelevich, A; Hill, J; Lee, SH; Moon, DH; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Beauchêne, A; Drapier, O; Giampaolo, A; Mueller, TA; Santos, AD; Paganini, P; Quilain, B; Ishizuka, T; Nakamura, T; Jang, JS; Learned, JG; Choi, K; Iovine, N; Cao, S; Anthony, LHV; Martin, D; Scott, M; Sztuc, AA; Uchida, Y; Berardi, V; Catanesi, MG; Radicioni, E; Calabria, NF; Langella, A; Machado, LN; De Rosa, G; Collazuol, G; Iacob, F; Lamoureux, M; Mattiazzi, M; Ludovici, L; Gonin, M; Pronost, G; Fujisawa, C; Maekawa, Y; Nishimura, Y; Okazaki, R; Akutsu, R; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Bhuiyan, N; Burton, GT; Di Lodovico, F; Gao, J; Goldsack, A; Katori, T; Migenda, J; Xie, Z; Zsoldos, S; Kotsar, Y; Ozaki, H; Suzuki, AT; Takagi, Y; Takeuchi, Y; Feng, J; Feng, L; Hu, JR; Hu, Z; Kikawa, T; Mori, M; Nakaya, T; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Mehta, P; Tarrant, A; Fukuda, Y; Itow, Y; Menjo, H; Ninomiya, K; Lagoda, J; Lakshmi, SM; Mandal, M; Mijakowski, P; Prabhu, YS; Zalipska, J; Jia, M; Jiang, J; Jung, CK; Wilking, MJ; Yanagisawa, C; Hino, Y; Ishino, H; Kitagawa, H; Koshio, Y; Nakanishi, F; Sakai, S; Tada, T; Tano, T; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Holin, A; Nova, F; Yang, BS; Yang, JY; Yoo, J; Fannon, JEP; Kneale, L; Malek, M; McElwee, JM; Thiesse, MD; Thompson, LF; Wilson, ST; Okazawa, H; Kim, SB; Kwon, E; Seo, JW; Yu, I; Ichikawa, AK; Nakamura, KD; Tairafune, S; Nishijima, K; Nakagiri, K; Nakajima, Y; Shima, S; Taniuchi, N; Watanabe, E; Yokoyama, M; de Perio, P; Martens, K; Tsui, KM; Vagins, MR; Xia, J; Kuze, M; Izumiyama, S; Matsumoto, R; Ishitsuka, M; Ito, H; Kinoshita, T; Matsumoto, R; Ommura, Y; Shigeta, N; Shinoki, M; Suganuma, T; Yamauchi, K; Martin, JF; Tanaka, HA; Towstego, T; Gaur, R; Gousy-Leblanc, V; Hartz, M; Konaka, A; Li, X; Prouse, NW; Chen, S; Xu, BD; Zhang, B; Posiadala-Zezula, M; Boyd, SB; Edwards, R; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Marti, L; Minamino, A; Pintaudi, G; Sano, S; Suzuki, S; Wada, K

ASTROPHYSICAL JOURNAL LETTERS 951 巻 ( 2 ) 2023年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Astrophysical Journal Letters

We report the first search result for the flux of astrophysical electron antineutrinos for energies(10)MeV in the gadolinium-loaded Super-Kamiokande (SK) detector. In 2020 June, gadolinium was introduced to the ultrapure water of the SK detector in order to detect neutrons more efficiently. In this new experimental phase, SK-Gd, we can search for electron antineutrinos via inverse beta decay with efficient background rejection thanks to the high efficiency of the neutron tagging technique. In this paper, we report the result for the initial stage of SK-Gd, during 2020 August 26, and 2022 June 1 with a 22.5 × 552 kton · day exposure at 0.01% Gd mass concentration. No significant excess over the expected background in the observed events is found for the neutrino energies below 31.3 MeV. Thus, the flux upper limits are placed at the 90% confidence level. The limits and sensitivities are already comparable with the previous SK result with pure water (22.5 × 2970 kton · day) owing to the enhanced neutron tagging. Operation with Gd increased to 0.03% started in 2022 June.

DOI： 10.3847/2041-8213/acdc9e

Measurement of the cosmogenic neutron yield in Super-Kamiokande with gadolinium loaded water 査読有り国際共著国際誌 Open Access

Shinoki, M; Abe, K; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kaneshima, R; Kashiwagi, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakano, Y; Nakahata, M; Nakayama, S; Noguchi, Y; Okamoto, K; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Takenaka, A; Tanaka, H; Watanabe, S; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Yoshida, S; Megias, GD; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Pointon, BW; Kearns, E; Raaf, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Kropp, WR; Locke, S; Smy, MB; Sobel, HW; Takhistov, V; Yankelevich, A; Hill, J; Lee, SH; Moon, DH; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Beauchêne, A; Bernard, L; Coffani, A; Drapier, O; El Hedri, S; Giampaolo, A; Mueller, TA; Santos, AD; Paganini, P; Quilain, B; Ishizuka, T; Nakamura, T; Jang, JS; Learned, JG; Choi, K; Cao, S; Anthony, LHV; Martin, D; Scott, M; Sztuc, AA; Uchida, Y; Berardi, V; Catanesi, MG; Radicioni, E; Calabria, NF; Langella, A; Machado, LN; De Rosa, G; Collazuol, G; Iacob, F; Lamoureux, M; Mattiazzi, M; Ludovici, L; Gonin, M; Pronost, G; Fujisawa, C; Maekawa, Y; Nishimura, Y; Akutsu, R; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Bhuiyan, N; Boschi, T; Burton, GT; Di Lodovico, F; Gao, J; Goldsack, A; Katori, T; Migenda, J; Taani, M; Xie, Z; Zsoldos, S; Kotsar, Y; Ozaki, H; Suzuki, AT; Takeuchi, Y; Bronner, C; Feng, J; Kikawa, T; Mori, M; Nakaya, T; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Mehta, P; Tarrant, A; Tsui, KM; Fukuda, Y; Itow, Y; Menjo, H; Ninomiya, K; Lagoda, J; Lakshmi, SM; Mandal, M; Mijakowski, P; Prabhu, YS; Zalipska, J; Jia, M; Jiang, J; Jung, CK; Wilking, MJ; Yanagisawa, C; Harada, M; Ishino, H; Ito, S; Kitagawa, H; Koshio, Y; Nakanish, F; Sakai, S; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Holin, A; Nova, F; Yang, JY; Yang, BS; Yoo, J; Fannon, JEP; Kneale, L; Malek, M; McElwee, JM; Stone, O; Thiesse, MD; Thompson, LF; Okazawa, H; Kim, SB; Kwon, E; Seo, JW; Yu, I; Ichikawa, AK; Nakamura, KD; Tairafune, S; Nishijima, K; Koshiba, M; Iwamoto, K; Nakagiri, K; Nakajima, Y; Shima, S; Taniuchi, N; Yokoyama, M; Martens, K; de Perio, P; Vagins, MR; Xia, J; Kuze, M; Izumiyama, S; Inomoto, M; Ishitsuka, M; Ito, H; Kinoshita, T; Matsumoto, R; Ommura, Y; Shigeta, N; Suganuma, T; Yamauchi, K; Martin, JF; Tanaka, HA; Towstego, T; Gaur, R; Gousy-Leblanc, V; Hartz, M; Konaka, A; Li, X; Prouse, NW; Chen, S; Xu, BD; Zhang, B; Posiadala-Zezula, M; Boyd, SB; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Marti, L; Minamino, A; Pintaudi, G; Sano, S; Suzuki, S; Wada, K

PHYSICAL REVIEW D 107 巻 ( 9 ) 2023年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Physical Review D

Cosmic-ray muons that enter the Super-Kamiokande detector cause hadronic showers due to spallation in water, producing neutrons and radioactive isotopes. These are a major background source for studies of MeV-scale neutrinos and searches for rare events. In 2020, gadolinium was introduced into the ultra-pure water in the Super-Kamiokande detector to improve the detection efficiency of neutrons. In this study, the cosmogenic neutron yield was measured using data acquired during the period after the gadolinium loading. The yield was found to be (2.76±0.02(stat)±0.19(syst))×10-4 μ-1 g-1 cm2 at an average muon energy 259 GeV at the Super-Kamiokande detector.

DOI： 10.1103/PhysRevD.107.092009

Search for Cosmic-Ray Boosted Sub-GeV Dark Matter Using Recoil Protons at Super-Kamiokande 査読有り国際共著国際誌 Open Access

Abe, K; Hayato, Y; Hiraide, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kaneshima, R; Kashiwagi, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakano, Y; Nakahata, M; Nakayama, S; Noguchi, Y; Okamoto, K; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Takenaka, A; Tanaka, H; Watanabe, S; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Xia, J; Yoshida, S; Megias, GD; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Pointon, BW; Kearns, E; Raaf, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Kropp, WR; Locke, S; Smy, MB; Sobel, HW; Takhistov, V; Yankelevich, A; Hill, J; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Bernard, L; Coffani, A; Drapier, O; El Hedri, S; Giampaolo, A; Mueller, TA; Santos, AD; Paganini, P; Quilain, B; Ishizuka, T; Nakamura, T; Jang, JS; Learned, JG; Choi, K; Cao, S; Anthony, LHV; Martin, D; Scott, M; Sztuc, AA; Uchida, Y; Berardi, V; Catanesi, MG; Radicioni, E; Calabria, NF; Machado, LN; De Rosa, G; Collazuol, G; Iacob, F; Lamoureux, M; Mattiazzi, M; Ludovici, L; Gonin, M; Pronost, G; Fujisawa, C; Maekawa, Y; Nishimura, Y; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Boschi, T; Di Lodovico, F; Gao, J; Goldsack, A; Katori, T; Migenda, J; Taani, M; Zsoldos, S; Kotsar, Y; Ozaki, H; Suzuki, AT; Takeuchi, Y; Bronner, C; Feng, J; Kikawa, T; Mori, M; Nakaya, T; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Mehta, P; Tsui, KM; Fukuda, Y; Itow, Y; Menjo, H; Ninomiya, K; Lagoda, J; Lakshmi, SM; Mandal, M; Mijakowski, P; Prabhu, YS; Zalipska, J; Jia, M; Jiang, J; Jung, CK; Wilking, MJ; Yanagisawa, C; Harada, M; Ishino, H; Ito, S; Kitagawa, H; Koshio, Y; Nakanishi, F; Sakai, S; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Nova, F; Yang, JY; Malek, M; McElwee, JM; Stone, O; Thiesse, MD; Thompson, LF; Okazawa, H; Kim, SB; Seo, JW; Yu, I; Ichikawa, AK; Nakamura, KD; Tairafune, S; Nishijima, K; Iwamoto, K; Nakagiri, K; Nakajima, Y; Taniuchi, N; Yokoyama, M; Martens, K; de Perio, P; Vagins, MR; Kuze, M; Izumiyama, S; Inomoto, M; Ishitsuka, M; Ito, H; Kinoshita, T; Matsumoto, R; Ommura, Y; Shigeta, N; Shinoki, M; Suganuma, T; Yamauchi, K; Martin, JF; Tanaka, HA; Towstego, T; Akutsu, R; Gousy-Leblanc, V; Hartz, M; Konaka, A; Prouse, NW; Chen, S; Xu, BD; Zhang, B; Posiadala-Zezula, M; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Marti, L; Minamino, A; Pintaudi, G; Sano, S; Suzuki, S; Wada, K

PHYSICAL REVIEW LETTERS 130 巻 ( 3 ) 頁： 031802 2023年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Physical Review Letters

We report a search for cosmic-ray boosted dark matter with protons using the 0.37 megaton×years data collected at Super-Kamiokande experiment during the 1996-2018 period (SKI-IV phase). We searched for an excess of proton recoils above the atmospheric neutrino background from the vicinity of the Galactic Center. No such excess is observed, and limits are calculated for two reference models of dark matter with either a constant interaction cross section or through a scalar mediator. This is the first experimental search for boosted dark matter with hadrons using directional information. The results present the most stringent limits on cosmic-ray boosted dark matter and exclude the dark matter-nucleon elastic scattering cross section between 10-33cm2 and 10-27cm2 for dark matter mass from 1 MeV/c2 to 300 MeV/c2.

DOI： 10.1103/PhysRevLett.130.031802

その他リンク： https://arxiv.org/abs/2209.14968

LHCf Run II physics results in proton-proton collisions at √s = 13 TeV 招待有り国際共著

A. Tiberio et al.

Proceedings of Science 414 巻頁： 121 2022年11月

Search for proton decay via p → μ<SUP>+</SUP> K<SUP>0</SUP> in 0.37 megaton-years exposure of Super-Kamiokande 査読有り国際共著国際誌 Open Access

Matsumoto, R; Abe, K; Hayato, Y; Hiraide, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kaneshima, R; Kashiwagi, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakano, Y; Nakahata, M; Nakayama, S; Noguchi, Y; Okamoto, K; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Takenaka, A; Tanaka, H; Watanabe, S; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Xia, J; Yoshida, S; Megias, GD; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Pointon, BW; Kearns, E; Raaf, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Kropp, WR; Locke, S; Smy, MB; Sobel, HW; Takhistov, ; Yankelevich, A; Hill, J; Kim, JY; Lim, IT; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Bernard, L; Coffani, A; Drapier, O; El Hedri, S; Giampaolo, A; Mueller, TA; Santos, AD; Paganini, P; Quilain, B; Ishizuka, T; Nakamura, T; Jang, JS; Learned, JG; Choi, K; Cao, S; Anthony, LH; Martin, D; Scott, M; Sztuc, AA; Uchida, Y; Berardi, ; Catanesi, MG; Radicioni, E; Calabria, NF; Machado, LN; De Rosa, G; Collazuol, G; Iacob, F; Lamoureux, M; Mattiazzi, M; Ludovici, L; Gonin, M; Pronost, G; Fujisawa, C; Maekawa, Y; Nishimura, Y; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Boschi, T; Di Lodovico, F; Gao, J; Goldsack, A; Katori, T; Migenda, J; Taani, M; Xie, Z; Zsoldos, S; Kotsar, Y; Ozaki, H; Suzuki, AT; Takeuchi, Y; Yamamoto, S; Bronner, C; Feng, J; Kikawa, T; Mori, M; Nakaya, T; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Mehta, P; Tsui, KM; Tarrant, A; Fukuda, Y; Itow, Y; Menjo, H; Ninomiya, K; Lagoda, J; Lakshmi, SM; Mandal, M; Mijakowski, P; Prabhu, YS; Zalipska, J; Jia, M; Jiang, J; Jung, CK; Wilking, MJ; Yanagisawa, C; Harada, M; Ishino, H; Ito, S; Kitagawa, H; Koshio, Y; Ma, W; Nakanishi, F; Sakai, S; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Holin, A; Nova, F; Yang, JY; Malek, M; McElwee, JM; Stone, O; Thiesse, MD; Thompson, LF; Okazawa, H; Kim, SB; Kwon, E; Seo, JW; Yu, ; Ichikawa, AK; Nakamura, KD; Tairafune, S; Nishijima, K; Koshiba, M; Iwamoto, K; Nakagiri, K; Nakajima, Y; Shima, S; Taniuchi, N; Yokoyama, M; Martens, K; de Perio, P; Vagins, MR; Kuze, M; Izumiyama, S; Inomoto, M; Ishitsuka, M; Ito, H; Kinoshita, T; Ommura, Y; Shigeta, N; Shinoki, M; Suganuma, T; Yamauchi, K; Martin, JF; Tanaka, HA; Towstego, T; Akutsu, R; Gousy-Leblanc, ; Hartz, M; Konaka, A; Li, X; Prouse, NW; Chen, S; Xu, BD; Zhang, B; Posiadala-Zezula, M; Boyd, SB; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Marti, L; Minamino, A; Pintaudi, G; Sano, S; Suzuki, S; Wada, K

PHYSICAL REVIEW D 106 巻 ( 7 ) 2022年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Physical Review D

We searched for proton decay via p→μ+K0 in 0.37 Mton·years of data collected between 1996 and 2018 from the Super-Kamiokande water Cherenkov experiment. The selection criteria were defined separately for KS0 and KL0 channels. No significant event excess has been observed. As a result of this analysis, which extends the previous search by an additional 0.2 Mton·years of exposure and uses an improved event reconstruction, we set a lower limit of 3.6×1033 years on the proton lifetime.

DOI： 10.1103/PhysRevD.106.072003

Searching for Supernova Bursts in Super-Kamiokande IV 査読有り国際共著国際誌 Open Access

Mori, M; Abe, K; Hayato, Y; Hiraide, K; Ieki, K; Ikeda, M; Imaizumi, S; Kameda, J; Kanemura, Y; Kaneshima, R; Kashiwagi, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nagao, Y; Nakahata, M; Nakano, Y; Nakayama, S; Noguchi, Y; Okada, T; Okamoto, K; Orii, A; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Takenaka, A; Tanaka, H; Tomiya, T; Watanabe, S; Yano, T; Yoshida, S; Han, S; Kajita, T; Okumura, K; Tashiro, T; Wang, X; Xia, J; Megias, GD; Bravo-Berguño, D; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Zsoldos, S; Pointon, BW; Blaszczyk, FDM; Kearns, E; Raaf, JL; Stone, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Kropp, WR; Locke, S; Smy, MB; Sobel, HW; Takhistov, ; Yankelevich, A; Hill, J; Kim, JY; Lim, IT; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Bernard, L; Coffani, A; Drapier, O; El Hedri, S; Giampaolo, A; Mueller, TA; Paganini, P; Quilain, B; Santos, AD; Ishizuka, T; Nakamura, T; Jang, JS; Learned, JG; Anthony, LH; Martin, D; Scott, M; Sztuc, AA; Uchida, Y; Berardi, ; Catanesi, MG; Radicioni, E; Calabria, NF; Machado, LN; De Rosa, G; Collazuol, G; Iacob, F; Lamoureux, M; Mattiazzi, M; Ludovici, L; Gonin, M; Pronost, G; Maekawa, Y; Nishimura, Y; Fujisawa, C; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Ozaki, H; Shiozawa, T; Suzuki, AT; Takeuchi, Y; Yamamoto, S; Kotsar, Y; Ashida, Y; Bronner, C; Feng, J; Hirota, S; Kikawa, T; Nakaya, T; Wendell, RA; Yasutome, K; McCauley, N; Mehta, P; Tsui, KM; Fukuda, Y; Itow, Y; Menjo, H; Ninomiya, K; Niwa, T; Tsukada, M; Lagoda, J; Lakshmi, SM; Mijakowski, P; Zalipska, J; Mandal, M; Prabhu, YS; Jiang, J; Jung, CK; Vilela, C; Wilking, MJ; Yanagisawa, C; Jia, M; Hagiwara, K; Harada, M; Horai, T; Ishino, H; Ito, S; Kitagawa, H; Koshio, Y; Ma, W; Nakanishi, F; Piplani, N; Sakai, S; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Nova, F; Boschi, T; Gao, J; Goldsack, A; Katori, T; Di Lodovico, F; Migenda, J; Taani, M; Zsoldos, S; Yang, JY; Jenkins, SJ; Malek, M; McElwee, JM; Stone, O; Thiesse, MD; Thompson, LF; Okazawa, H; Kim, SB; Seo, JW; Yu, ; Nishijima, K; Koshiba, M; Nakagiri, K; Nakajima, Y; Iwamoto, K; Taniuchi, N; Yokoyama, M; Martens, K; de Perio, P; Vagins, MR; Kuze, M; Izumiyama, S; Yoshida, T; Inomoto, M; Ishitsuka, M; Ito, H; Kinoshita, T; Matsumoto, R; Ohta, K; Ommura, Y; Shigeta, N; Shinoki, M; Suganuma, T; Yamauchi, K; Martin, JF; Tanaka, HA; Towstego, T; Akutsu, R; Gousy-Leblanc, ; Hartz, M; Konaka, A; Prouse, NW; Chen, S; Xu, BD; Zhang, B; Posiadala-Zezula, M; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Walker, J; Marti, L; Minamino, A; Okamoto, K; Pintaudi, G; Sasaki, R; Sano, S; Suzuki, S; Wada, K; Cao, S; Ichikawa, A; Nakamura, KD; Tairafune, S; Choi, K

ASTROPHYSICAL JOURNAL 938 巻 ( 1 ) 2022年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Astrophysical Journal

Super-Kamiokande has been searching for neutrino bursts characteristic of core-collapse supernovae continuously, in real time, since the start of operations in 1996. The present work focuses on detecting more distant supernovae whose event rate may be too small to trigger in real time, but may be identified using an offline approach. The analysis of data collected from 2008 to 2018 found no evidence of distant supernovae bursts. This establishes an upper limit of 0.29 yr-1 on the rate of core-collapse supernovae out to 100 kpc at 90% C.L. For supernovae that fail to explode and collapse directly to black holes the limit reaches to 300 kpc.

DOI： 10.3847/1538-4357/ac8f41

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