Updated on 2022/03/29

写真a

 
KITAGUCHI Masaaki
 
Organization
Kobayashi-Maskawa Institute for the Origin of Particles and the Universe (KMI) Associate professor
Graduate School
Graduate School of Science
Title
Associate professor
Contact information
メールアドレス

Degree 1

  1. 博士(理学) ( 2004.5   京都大学 ) 

Research Interests 3

  1. Particle Physics

  2. Nuclear Physics

  3. Neutron Optics

Research History 6

  1. Nagoya University   Kobayashi-Maskawa Institute for the Origin of Particles and the Universe (KMI)   Associate professor

    2019.10

  2. Nagoya University   Center for Experimental Studies Division of Flavor Physics   Associate professor

    2013.4 - 2019.9

  3. Nagoya University   Graduate School of Science Division of Particle and Astrophysical Sciences Elementary Particle Physics   Associate professor

    2013.2 - 2013.3

  4. Nagoya University   Kobayashi-Maskawa Institute   Associate professor

    2013.2

  5. Research Reactor Institute, Kyoto University   Neutron Optics   Assistant Professor

    2004.11 - 2013.1

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    Country:Japan

  6. Research Reactor Institute, Kyoto University   Neutron Optics   Asistant Professor

    2004.11 - 2013.1

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Education 3

  1. Kyoto University   Graduate School, Division of Natural Science

    1999.4 - 2004.5

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    Country: Japan

  2. Kyoto University   Graduate School, Division of Natural Science

    1999.4 - 2004.5

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    Country: Japan

  3. Kyoto University   Graduate School, Division of Natural Science

    1999.4 - 2004.5

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    Country: Japan

Professional Memberships 4

  1. The Physical Society of Japan

  2. Japanese Society for Neutron Science

  3. The Physical Society of Japan

  4. Japanese Society for Neutron Science

Committee Memberships 6

  1. The Japanese Society of Neutron Science   Executive secretary for general affairs  

    2017.4 - 2019.3   

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    Committee type:Academic society

  2. The Japanese Society of Neutron Science   Executive secretary for general affairs  

    2017.4 - 2019.3   

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    Committee type:Academic society

  3. 日本中性子科学会   庶務幹事  

    2017.4 - 2019.3   

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    Committee type:Academic society

  4. NOP2017 Local Organizing Committee   Chair  

    2017.1 - 2018.11   

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    Committee type:Other

  5. NOP2017 Local Organizing Committee   Chair  

    2017.1 - 2018.11   

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    Committee type:Other

  6. NOP2017現地実行委員会   現地実行委員長  

    2017.1 - 2018.11   

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    Committee type:Other

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Awards 1

  1. The Japanese Society of Neutron Science Young Scientist Award

    2005.12   The Japanese Society of Neutron Science  

    KITAGUCHI Masaaki

 

Papers 80

  1. Neutron lifetime measurement with pulsed cold neutrons Reviewed

    Hirota K., Ichikawa G., Ieki S., Ino T., Iwashita Y., Kitaguchi M., Kitahara R., Koga J., Mishima K., Mogi T., Morikawa K., Morishita A., Nagakura N., Oide H., Okabe H., Otono H., Seki Y., Sekiba D., Shima T., Shimizu H. M., Sumi N., Sumino H., Tomita T., Uehara H., Yamada T., Yamashita S., Yano K., Yokohashi M., Yoshioka T.

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS   Vol. 2020 ( 12 )   2020.12

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

    DOI: 10.1093/ptep/ptaa169

    Web of Science

  2. Transverse asymmetry of gamma rays from neutron -induced compound states of La-140 Reviewed International journal

    Yamamoto T., Okudaira T., Endo S., Fujioka H., Hirota K., Ino T., Ishizaki K., Kimura A., Kitaguchi M., Koga J., Makise S., Niinomi Y., Oku T., Sakai K., Shima T., Shimizu H. M., Takada S., Tani Y., Yoshikawa H., Yoshioka T.

    PHYSICAL REVIEW C   Vol. 101 ( 6 )   2020.6

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

    DOI: 10.1103/PhysRevC.101.064624

    Web of Science

  3. Measurement of the total neutron-scattering cross-section ratios of noble gases of natural isotopic composition using a pulsed neutron beam Reviewed International coauthorship International journal

    Haddock Christopher C., Hiromoto Masayuki, Hirota Katsuya, Ino Takashi, Kitaguchi Masaaki, Mishima Kenji, Oi Noriko, Shima Tatsushi, Shimizu Hirohiko M., Snow W. Michael, Yoshioka Tamaki

    PHYSICAL REVIEW C   Vol. 100 ( 6 )   2019.12

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

    DOI: 10.1103/PhysRevC.100.064002

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  4. Angular distribution of γ rays from neutron-induced compound states of la 140 Reviewed

    T. Okudaira, S. Takada, K. Hirota, A. Kimura, M. Kitaguchi, J. Koga, K. Nagamoto, T. Nakao, A. Okada, K. Sakai, H. M. Shimizu, T. Yamamoto, T. Yoshioka

    Physical Review C   Vol. 97 ( 3 )   2018.3

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

    © 2018 American Physical Society. The angular distribution of individual γ rays, emitted from a neutron-induced compound-nuclear state via radiative capture reaction of La139(n,γ) has been studied as a function of incident neutron energy in the epithermal region by using germanium detectors. An asymmetry ALH was defined as (NL-NH)/(NL+NH), where NL and NH are integrals of low- and high-energy region of a neutron resonance respectively, and we found that ALH has the angular dependence of (Acosθγ+B), where θγ is the emitted angle of γ rays, with A=-0.3881±0.0236 and B=-0.0747±0.0105 in 0.74 eV p-wave resonance. This angular distribution was analyzed within the framework of interference between s- and p-wave amplitudes in the entrance channel to the compound-nuclear state, and it is interpreted as the value of the partial p-wave neutron width corresponding to the total angular momentum of the incident neutron combined with the weak matrix element, in the context of the mechanism of enhanced parity-violating effects. Additionally, we use the result to quantify the possible enhancement of the breaking of time-reversal invariance in the vicinity of the p-wave resonance.

    DOI: 10.1103/PhysRevC.97.034622

    Web of Science

    Scopus

  5. Search for deviations from the inverse square law of gravity at nm range using a pulsed neutron beam Reviewed

    Christopher C. Haddock, Noriko Oi, Katsuya Hirota, Takashi Ino, Masaaki Kitaguchi, Satoru Matsumoto, Kenji Mishima, Tatsushi Shima, Hirohiko M. Shimizu, W. Michael Snow, Tamaki Yoshioka

    Physical Review D   Vol. 97 ( 6 )   2018.3

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

    © 2018 American Physical Society. We describe an experimental search for deviations from the inverse-square law of gravity at the nanometer length scale using neutron scattering from noble gases on a pulsed slow neutron beam line. By measuring the neutron momentum transfer (q) dependence of the differential cross section for xenon and helium and comparing to their well-known analytical forms, we place an upper bound on the strength of a new interaction as a function of interaction length λ which improves upon previous results in the region λ<0.1 nm, and remains competitive in the larger-λ region. A pseudoexperimental simulation is developed for this experiment and its role in the data analysis is described. We conclude with plans for improving sensitivity in the larger-λ region.

    DOI: 10.1103/PhysRevD.97.062002

    Web of Science

    Scopus

  6. Concentration of the velocity distribution of pulsed neutron beams Reviewed

    Masaaki Kitaguchi, Yoshihisa Iwashita, Hirohiko M. Shimizu

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS   Vol. 2017 ( 4 )   2017.4

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:OXFORD UNIV PRESS INC  

    The velocity of neutrons from a pulsed neutron source is well defined as a function of their arrival time. An electro-magnetic neutron accelerator/decelerator synchronized with the neutron time-of-flight is capable of selectively changing the neutron velocity and concentrating the velocity distribution. The possible enhancement of the neutron intensity at a specific neutron velocity by orders of magnitude is discussed, together with an experimental design.

    DOI: 10.1093/ptep/ptx029

    Web of Science

  7. A neutron detector with submicron spatial resolution using fine-grained nuclear emulsion Reviewed

    N. Naganawa, S. Awano, M. Hino, M. Hirose, K. Hirota, H. Kawahara, M. Kitaguchi, K. Mishima, T. Nagae, H. M. Shimizu, S. Tasaki, A. Umemoto

    NEUTRON IMAGING FOR APPLICATIONS IN INDUSTRY AND SCIENCE   Vol. 88   page: 224 - 230   2017

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    Language:Japanese   Publishing type:Research paper (international conference proceedings)   Publisher:ELSEVIER SCIENCE BV  

    We developed a neutron detector with submicron spatial resolution by incorporating Li-6 into a fine-grained nuclear emulsion. Upon exposure to thermal neutrons, tracks from neutron capture events were observed. The detector spatial resolution was estimated from their grain density. Detection efficiency was measured using the detector response to cold neutrons. (C) 2017 The Authors. Published by Elsevier B.V.

    DOI: 10.1016/j.phpro.2017.06.031

    Web of Science

  8. Neutron-antineutron oscillations: Theoretical status and experimental prospects Reviewed

    D. G. Phillips, W. M. Snow, K. Babul, S. Banerjee, D. V. Baxter, Z. Berezhiani, M. Bergevin, S. Bhattacharya, G. Brooijmans, L. Castellanos, M. -C. Chen, C. E. Coppola, R. Cowsik, J. A. Crabtree, P. Das, E. B. Dees, A. Dolgov, P. D. Ferguson, M. Frost, T. Gabrie, A. Gal, F. Gallmeier, K. Ganezer, E. Golubeva, G. Greene, B. Hartfiel, A. Hawari, L. Heilbronn, C. Johnson, Y. Kamyshkov, B. Kerbikov, M. Kitaguchi, B. Z. Kopeliovich, V. B. Kopeliovich, V. A. Kuzmin, C. -Y. Liu, P. McGaughey, M. Mocko, R. Mohapatra, N. Mokhov, G. Muhrer, H. P. Mumm, L. Okun, R. W. Pattie, C. Quigg, E. Ramberg, A. Ray, A. Roy, A. Ruggles, U. Sarkar, A. Saunders, A. P. Serebrov, H. M. Shimizu, R. Shrock, A. K. Sikdar, S. Sjue, S. Striganov, L. W. Townsend, R. Tschirhart, A. Vainshtein, R. Van Kooten, Z. Wang, A. R. Young

    PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS   Vol. 612   page: 1 - 45   2016.2

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

    The observation of neutrons turning into antineutrons would constitute a discovery of fundamental importance for particle physics and cosmology. Observing the n-(n) over bar transition would show that baryon number (B) is violated by two units and that matter containing neutrons is unstable. It would provide a clue to how the matter in our universe might have evolved from the B = 0 early universe. If seen at rates observable in foreseeable next-generation experiments, it might well help us understand the observed baryon asymmetry of the universe. A demonstration of the violation of B-L by 2 units would have a profound impact on our understanding of phenomena beyond the Standard Model of particle physics.
    Slow neutrons have kinetic energies of a few meV. By exploiting new slow neutron sources and optics technology developed for materials research, an optimized search for oscillations using free neutrons from a slow neutron moderator could improve existing limits on the free oscillation probability by at least three orders of magnitude. Such an experiment would deliver a slow neutron beam through a magnetically-shielded vacuum chamber to a thin annihilation target surrounded by a low-background antineutron annihilation detector. Antineutron annihilation in a target downstream of a free neutron beam is such a spectacular experimental signature that an essentially background-free search is possible. An authentic positive signal can be extinguished by a very small change in the ambient magnetic field in such an experiment. It is also possible to improve the sensitivity of neutron oscillation searches in nuclei using large underground detectors built mainly to search for proton decay and detect neutrinos.
    This paper summarizes the relevant theoretical developments, outlines some ideas to improve experimental searches for free neutron oscillations, and suggests avenues both for theoretical investigation and for future improvement in the experimental sensitivity. (C) 2015 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physrep.2015.11.001

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  9. Observation of the Spatial Distribution of Gravitationally Bound Quantum States of Ultracold Neutrons and Its Derivation Using the Wigner Function Reviewed

    Ichikawa G., Komamiya S., Kamiya Y., Minami Y., Tani M., Geltenbort P., Yamamura K., Nagano M., Sanuki T., Kawasaki S., Hino M., Kitaguchi M.

    PHYSICAL REVIEW LETTERS   Vol. 112 ( 7 )   2014.2

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  10. Demonstration of focusing by a neutron accelerator Reviewed

    Arimoto Yasushi, Gertenbort Peter, Imajo Sohei, Iwashita Yoshihisa, Kitaguchi Masaaki, Seki Yoshichika, Shimizu Hirohiko M., Yoshioka Tamaki

    PHYSICAL REVIEW A   Vol. 86 ( 2 )   2012.8

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    Authorship:Corresponding author   Language:English  

    DOI: 10.1103/PhysRevA.86.023843

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  11. Nuclear-matter modification of decay widths in the phi -&gt; e(+)e(-) and phi -&gt; K+K- channels Reviewed

    F. Sakuma, J. Chiba, H. En'yo, Y. Fukao, H. Funahashi, H. Hamagaki, M. Ieiri, M. Ishino, H. Kanda, M. Kitaguchi, S. Mihara, K. Miwa, T. Miyashita, T. Murakami, R. Muto, T. Nakura, M. Naruki, K. Ozawa, O. Sasaki, M. Sekimoto, T. Tabaru, K. H. Tanaka, M. Togawa, S. Yamada, S. Yokkaichi, Y. Yoshimura

    PHYSICAL REVIEW LETTERS   Vol. 98 ( 15 )   2007.4

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER PHYSICAL SOC  

    The invariant mass spectra of phi -&gt; K+ K- are measured in 12 GeV p + A reactions in order to search for the in-medium modification of phi mesons. The observed K+ K- spectra are well reproduced by the relativistic Breit-Wigner function with a combinatorial background shape in three beta gamma regions between 1.0 and 3.5. The nuclear mass number dependence of the yields of the K+ K- decay channel is compared to the simultaneously measured e(+) e(-) decay channel for carbon and copper targets. We parameterize the production yields as sigma(A) = sigma(0)A(alpha) and obtain alpha(phi -&gt; K+K-) - alpha(phi -&gt; e+e-) to be 0: 14 +/- 0: 12. Limits are obtained for the partial decay widths of the phi mesons in nuclear matter.

    DOI: 10.1103/PhysRevLett.98.152302

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  12. First observation of phi-meson mass modification in nuclear medium Reviewed

    R. Muto, J. Chiba, H. En'yo, Y. Fukao, H. Funahashi, H. Hamagaki, M. Ieiri, M. Ishino, H. Kanda, M. Kitaguchi, S. Mihara, K. Miwa, T. Miyashita, T. Murakami, T. Nakura, M. Naruki, M. Nomachi, K. Ozawa, F. Sakuma, O. Sasaki, H. D. Sato, M. Sekimoto, T. Tabaru, K. H. Tanaka, M. Togawa, S. Yamada, S. Yokkaichi, Y. Yoshimura

    NUCLEAR PHYSICS A   Vol. 774   page: 723 - 726   2006.8

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

    We have measured e(+)e(-) invariant mass spectra in 12 GeV p + A interactions at the KEK Proton-Synchrotron. The aim of the experiment is to detect possible in-medium modification of vector mesons at normal nuclear density. We used carbon and copper targets to study the nuclear size dependence of the e(+)e(-) invariant mass spectra. A significant enhancement on the low-mass side of the phi meson peak was observed in the low beta gamma region (beta gamma(phi) &lt; 1.25) in the copper data. On the other hand, in the higher beta gamma region (beta gamma(phi) &lt; 1.25), both the spectral shapes obtained from carbon and copper targets were consistent with the expected one from the simulation. This observation is consistent with a picture of the phi modification in a nucleus, i.e. normal nuclear density, because such an effect should be visible only for slowly moving mesons produced in a larger nucleus.

    DOI: 10.1016/j.nuclphysa.2006.06.123

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  13. Nuclear mass number dependence of inclusive production of omega and phi mesons in 12 GeV p plus A collisions Reviewed

    T. Tabaru, H. En'yo, R. Muto, M. Naruki, S. Yokkaichi, J. Chiba, M. Ieiri, O. Sasaki, M. Sekimoto, K. H. Tanaka, H. Funahashi, Y. Fukao, M. Kitaguchi, M. Ishino, H. Kanda, S. Mihara, T. Miyashita, K. Miwa, T. Murakami, T. Nakura, F. Sakuma, M. Togawa, S. Yamada, Y. Yoshimura, H. Hamagaki, K. Ozawa

    PHYSICAL REVIEW C   Vol. 74 ( 2 )   2006.8

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    The inclusive production of omega and phi mesons is studied in the backward region of the interaction of 12 GeV protons with polyethylene, carbon, and copper targets. The mesons are measured in e(+)e(-) decay channels. The production cross sections of the mesons are presented as functions of rapidity y and transverse momentum p(T). The nuclear mass number dependences (A dependences) are found to be A(0.710 +/- 0.021(stat)+/- 0.037(syst)) for omega mesons and A(0.937 +/- 0.049(stat)+/- 0.018(syst)) for phi mesons in the region of 0.9 &lt; y &lt; 1.7 and p(T)&lt; 0.75 GeV/c.

    DOI: 10.1103/PhysRevC.74.025201

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  14. Experimental signature of medium modifications for rho and omega mesons in the 12 GeV p+A reactions Reviewed

    M Naruki, Y Fukao, H Funahashi, M Ishino, H Kanda, M Kitaguchi, S Mihara, K Miwa, T Miyashita, T Murakami, T Nakura, F Sakuma, M Togawa, S Yamada, Y Yoshimura, H En'yo, R Muto, T Tabaru, S Yokkaichi, J Chiba, M Ieiri, O Sasaki, M Sekimoto, KH Tanaka, H Hamagaki, K Ozawa

    PHYSICAL REVIEW LETTERS   Vol. 96 ( 9 )   2006.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER PHYSICAL SOC  

    The invariant mass spectra of e(+)e(-) pairs produced in 12 GeV proton-induced nuclear reactions are measured at the KEK Proton Synchrotron. On the low-mass side of the omega meson peak, a significant enhancement over the known hadronic sources has been observed. The mass spectra, including the excess, are well reproduced by a model that takes into account the density dependence of the vector meson mass modification, as theoretically predicted.

    DOI: 10.1103/PhysRevLett.96.092301

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  15. Experimental signature of in-medium mass modification of vector mesons at normal nuclear density Reviewed

    R Muto, J Chiba, H En'yo, Y Fukao, H Funahashi, H Hamagaki, M Ieiri, M Ishino, H Kanda, M Kitaguchi, S Mihara, K Miwa, T Miyashita, T Murakami, T Nakura, M Naruki, M Nomachi, K Ozawa, F Sakuma, O Sasaki, HD Sato, M Sekimoto, T Tabaru, KH Tanaka, M Togawa, S Yamada, S Yokkaichi, Y Yoshimura

    JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS   Vol. 30 ( 8 ) page: S1023 - S1026   2004.8

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IOP PUBLISHING LTD  

    We measured invariant mass spectra of e(+)e(-) pairs produced in 12 GeV p+A interaction to investigate in-medium mass modification of vector mesons. We observed an enhancement over the known hadronic sources on the low-mass side of the omega meson mass peak. The obtained rho/omega ratio indicates that this enhancement mainly results from rho mesons whose mass was modified in nuclear matter. We performed a toy model calculation based on the prediction using the QCD sum rule. It reproduced well the tendency of our data.

    DOI: 10.1088/0954-3899/30/8/051

    Web of Science

  16. Non-dispersive measurement of the transverse coherence length of a cold neutron beam Reviewed

    M Kitaguchi, H Funahashi, T Nakura, K Taketani, M Hino, Y Otake, HM Shimizu

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   Vol. 72 ( 12 ) page: 3079 - 3081   2003.12

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:PHYSICAL SOC JAPAN  

    We have measured the transverse coherence length of a cold neutron beam using Jamin-type cold neutron spin interferometer. It can control the transverse shift between the superposed two paths with no dispersion. We have observed clearly that the contrast of interference fringes varies according to the coherence function determined by the collimation of the beam. The measured coherence length was consistent with the estimate by the standard deviation of the neutron transverse momentum distribution.

    DOI: 10.1143/JPSJ.72.3079

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  17. Direct Measurement of the Transverse Coherence Length of Cold Neutron Beam Reviewed

    Masaaki Kitaguchi, Haruhiko Funahashi, Terunao Nakura, Masahiro Hino, Hirohiko M. Shimizu

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   Vol. 72   page: 38 - 41   2003.11

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:PHYSICAL SOC JAPAN  

    We have developed new cold-neutron interferometer of Jamin-type. Clear interference fringes with the contrast of 60% were observed. This is the first success of neutron interferometer using four independent multilayer mirrors. By using this new interferometer, we have measured the transverse coherence length of cold neutron beam directly. The transverse dislocation between the two paths can be controlled with no dispersion. The measured coherence length was consistent with the estimate given by the transverse momentum distribution of incident beam.

    DOI: 10.1143/JPSJS.72SC.38

    Web of Science

  18. Measurement of invariant mass spectra of vector meson decaying in nuclear matter Reviewed

    M Naruki, J Chiba, H En'yo, H Funahashi, H Hamagaki, M Ieiri, M Ishino, H Kanda, M Kitaguchi, S Mihara, T Miyashita, T Murakami, R Muto, M Nomachi, K Ozawa, F Sakuma, O Sasaki, HD Sato, M Sekimoto, T Tabaru, KH Tanaka, S Yadama, S Yokkaichi, Y Yoshimura

    NUCLEAR PHYSICS A   Vol. 721   page: 297C - 300C   2003.6

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

    The experiment E325 has been performed at KEK PS. The data taking has been completed on February 2002. We have measured the invariant mass spectrum of e(+)e(-)pairs based on the statistics 100 times larger than our previous publication[3]. On the low-mass side of rho/omega meson, an enhancement over the known hadronic sources has been observed. The obtained rho/omega ratio in the spectrum is smaller than the ratio in pp interaction. This suggests that rho meson mass has been modified in nuclear matter.

    DOI: 10.1016/S0375-9474(03)01054-6

    Web of Science

  19. Cold-neutron interferometer of the Jamin type Reviewed

    M Kitaguchi, H Funahashi, T Nakura, M Hino, HM Shimizu

    PHYSICAL REVIEW A   Vol. 67 ( 3 ) page: 033609   2003.3

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMERICAN PHYSICAL SOC  

    A cold-neutron interferometer using four independent multilayer mirrors is demonstrated. We have observed interference fringes with a contrast of 60%. The interferometer is based on a pair of devices using etalons with an air gap of 9.75 mum in spacing. The optical system is equivalent to the Jamin-type interferometer, which allows much larger spatial separation between the two coherent beams than the previous type of multilayer interferometer to broaden the applicability of neutron interferometry.

    DOI: 10.1103/PhysRevA.67.033609

    Web of Science

  20. Measurement of nuclear spin relaxation time in lanthanum aluminate for development of polarized lanthanum target Reviewed International journal

    Ishizaki K., Hotta H., Ide I., Iinuma M., Iwata T., Kitaguchi M., Kohri H., Miura D., Miyachi Y., Ohta T., Shimizu H. M., Yoshikawa H., Yosoi M.

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 1020   2021.12

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

    DOI: 10.1016/j.nima.2021.165845

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  21. Pendellosung interferometry probes the neutron charge radius, lattice dynamics, and fifth forces Reviewed International coauthorship International journal

    Heacock Benjamin, Fujiie Takuhiro, Haun Robert W., Henins Albert, Hirota Katsuya, Hosobata Takuya, Huber Michael G., Kitaguchi Masaaki, Pushin Dmitry A., Shimizu Hirohiko, Takeda Masahiro, Valdillez Robert, Yamagata Yutaka, Young Albert R.

    SCIENCE   Vol. 373 ( 6560 ) page: 1239 - +   2021.9

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1126/science.abc2794

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  22. Energy-dependent angular distribution of individual gamma rays in the La-139(n, gamma) La-140* reaction Reviewed International journal

    Okudaira T., Endo S., Fujioka H., Hirota K., Ishizaki K., Kimura A., Kitaguchi M., Koga J., Niinomi Y., Sakai K., Shima T., Shimizu H. M., Takada S., Tani Y., Yamamoto T., Yoshikawa H., Yoshioka T.

    PHYSICAL REVIEW C   Vol. 104 ( 1 )   2021.7

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

    DOI: 10.1103/PhysRevC.104.014601

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  23. New high-sensitivity searches for neutrons converting into antineutrons and/or sterile neutrons at the HIBEAM/NNBAR experiment at the European Spallation Source Reviewed International coauthorship International journal

    Addazi A., Anderson K., Ansell S., Babu K. S., Barrow J. L., Baxter D. V, Bentley P. M., Berezhiani Z., Bevilacqua R., Biondi R., Bohm C., Brooijmans G., Broussard L. J., Cedercall J., Crawford C., Dev P. S. B., DiJulio D. D., Dolgov A. D., Dunne K., Fierlinger P., Fitzsimmons M. R., Fomin A., Frost M. J., Gardiner S., Gardner S., Galindo-Uribarri A., Geltenbort P., Girmohanta S., Golubev P., Golubeva E., Greene G. L., Greenshaw T., Gudkov V, Hall-Wilton R., Heilbronn L., Herrero-Garcia J., Holley A., Ichikawa G., Ito T. M., Iverson E., Johansson T., Jonsson L., Jwa Y-J, Kamyshkov Y., Kanaki K., Kearns E., Kokai Z., Kerbikov B., Kitaguchi M., Kittelmann T., Klinkby E., Kobakhidze A., Koerner L. W., Kopeliovich B., Kozela A., Kudryavtsev V, Kupsc A., Lee Y. T., Lindroos M., Makkinje J., Marquez J. I, Meirose B., Miller T. M., Milstead D., Mohapatra R. N., Morishima T., Muhrer G., Mumm H. P., Nagamoto K., Nepomuceno A., Nesti F., Nesvizhevsky V. V., Nilsson T., Oskarsson A., Paryev E., Pattie R. W. Jr., Penttil S., Perrey H., Pokotilovski Y. N., Potashnikovav I, Ramic K., Redding C., Richard J-M, Ries D., Rinaldi E., Rizzi N., Rossi N., Ruggles A., Rybolt B., Santoro V, Sarkar U., Saunders A., Senjanovic G., Serebrov A. P., Shimizu H. M., Shrock R., Silverstein S., Silvermyr D., Snow W. M., Takibayev A., Tkachev I, Townsend L., Tureanu A., Varriano L., Vainshtein A., de Vries J., Wagner R., Woracek R., Yamagata Y., Yiu S., Young A. R., Zanini L., Zhang Z., Zimmer O.

    JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS   Vol. 48 ( 7 )   2021.7

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

    DOI: 10.1088/1361-6471/abf429

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  24. Measurement of gamma rays from (LiF)-Li-6 tile as an inner wall of a neutron-decay detector Reviewed International journal

    Koga J., Ieki S., Kimura A., Kitaguchi M., Kitahara R., Mishima K., Nagakura N., Okudaira T., Otono H., Shimizu H. M., Sumi N., Takada S., Tomita T., Yamada T., Yoshioka T.

    JOURNAL OF INSTRUMENTATION   Vol. 16 ( 2 )   2021.2

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    DOI: 10.1088/1748-0221/16/02/P02001

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  25. Neutron Imaging Using a Fine-Grained Nuclear Emulsion

    Hirota Katsuya, Ariga Tomoko, Hino Masahiro, Ichikawa Go, Kawasaki Shinsuke, Kitaguchi Masaaki, Mishima Kenji, Muto Naoto, Naganawa Naotaka, Shimizu Hirohiko M.

    JOURNAL OF IMAGING   Vol. 7 ( 1 )   2021.1

  26. Development and application of a He-3 Neutron Spin Filter at J-PARC Reviewed International journal

    Okudaira T., Oku T., Ino T., Hayashida H., Kira H., Sakai K., Hiroi K., Takahashi S., Aizawa K., Endo H., Endo S., Hino M., Hirota K., Honda T., Ikeda K., Kakurai K., Kambara W., Kitaguchi M., Oda T., Ohshita H., Otomo T., Shimizu H. M., Shinohara T., Suzuki J., Yamamoto T.

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 977   2020.10

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    DOI: 10.1016/j.nima.2020.164301

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  27. An experimental setup for creating and imaging He-4(2)* excimer cluster tracers in superfluid helium-4 via neutron-He-3 absorption reaction International journal

    Sonnenschein V, Tsuji Y., Kokuryu S., Kubo W., Suzuki S., Tomita H., Kiyanagi Y., Iguchi T., Matsushita T., Wada N., Kitaguchi M., Shimizu H. M., Hirota K., Shinohara T., Hiroi K., Hayashida H., Guo W., Ito D., Saito Y.

    REVIEW OF SCIENTIFIC INSTRUMENTS   Vol. 91 ( 3 )   2020.3

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    DOI: 10.1063/1.5130919

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  28. Measurement and alleviation of subsurface damage in a thick-crystal neutron interferometer Reviewed International coauthorship International journal

    Heacock Benjamin, Haun Robert, Hirota Katsuya, Hosobata Takuya, Huber Michael G., Jamer Michelle E., Kitaguchi Masaaki, Pushin Dmitry A., Shimizu Hirohiko, Taminiau Ivar, Yamagata Yutaka, Yamamoto Tomoki, Young Albert R.

    ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES   Vol. 75   page: 833 - 841   2019.11

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    DOI: 10.1107/S2053273319011604

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  29. Improved accuracy in the determination of the thermal cross section of N-14(n, p)C-14 for neutron lifetime measurement Reviewed International journal

    Kitahara R., Hirota K., Ieki S., Ino T., Iwashita Y., Kitaguchi M., Koga J., Mishima K., Morishita A., Nagakura N., Oide H., Otono H., Seki Y., Sekiba D., Shima T., Shimizu H. M., Sumi N., Sumino H., Taketani K., Tomita T., Yamada T., Yamashita S., Yokohashi M., Yoshioka T.

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS   Vol. 2019 ( 9 )   2019.9

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    DOI: 10.1093/ptep/ptz096

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  30. Generation of He-4(2)* Clusters via Neutron-He-3 Absorption Reaction Toward Visualization of Full Velocity Field in Quantum Turbulence Reviewed International journal

    Matsushita T., Sonnenschein V., Guo W., Hayashida H., Hiroi K., Hirota K., Iguchi T., Ito D., Kitaguchi M., Kiyanagi Y., Kokuryu S., Kubo W., Saito Y., Shimizu H. M., Shinohara T., Suzuki S., Tomita H., Tsuji Y., Wada N.

    JOURNAL OF LOW TEMPERATURE PHYSICS   Vol. 196 ( 1-2 ) page: 275 - 282   2019.7

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    DOI: 10.1007/s10909-018-02112-3

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  31. First ultracold neutrons produced at TRIUMF

    Ahmed S., Altiere E., Andalib T., Bell B., Bidinosti C. P., Cudmore E., Das M., Davis C. A., Franke B., Gericke M., Giampa P., Gnyp P., Hansen-Romu S., Hatanaka K., Hayamizu T., Jamieson B., Jones D., Kawasaki S., Kikawa T., Kitaguchi M., Klassen W., Konaka A., Korkmaz E., Kuchler F., Lang M., Lee L., Lindner T., Madison K. W., Makida Y., Mammei J., Mammei R., Martin J. W., Matsumiya R., Miller E., Mishima K., Momose T., Okamura T., Page S., Picker R., Pierre E., Ramsay W. D., Rebenitsch L., Rehm F., Schreyer W., Shimizu H. M., Sidhu S., Sikora A., Smith J., Tanihata I., Thorsteinson B., Vanbergen S., van Oers W. T. H., Watanabe Y. X.

    PHYSICAL REVIEW C   Vol. 99 ( 2 )   2019.2

  32. Pendellosung interferometry by using pulsed neutrons (vol 908, pg 78, 2018)

    Itoh Shigeyasu, Nakaji Masaya, Uchida Yuya, Kitaguchi Masaaki, Shimizu Hirohiko M.

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 918   page: 99 - 99   2019.2

  33. New precise measurements of muonium hyperfine structure at J-PARC MUSE

    Strasser P., Abe M., Aoki M., Choi S., Fukao Y., Higashi Y., Higuchi T., Iinuma H., Ikedo Y., Ishida K., Ito T., Ito T. U., Iwasaki M., Kadono R., Kamigaito O., Kanda S., Kawagoe K., Kawall D., Kawamura N., Kitaguchi M., Koda A., Kojima K. M., Kubo K., Matama M., Matsuda Y., Matsudate Y., Mibe T., Miyake Y., Mizutani T., Nagamine K., Nishimura S., Ogitsu T., Saito N., Sasaki K., Seo S., Shimizu H. M., Shimomura K., Suchara T., Tajima M., Tanaka K. S., Tanaka T., Tojo J., Tomono D., Torii H. A., Torikai E., Toyoda A., Tsutsumi Y., Ueno K., Ueno Y., Yagi D., Yamamoto A., Yamanaka T., Yamazaki T., Yasuda H., Yoshida M., Yoshioka T.

    QUANTUM TECHNOLOGY INTERNATIONAL CONFERENCE 2018 (QTECH 2018)   Vol. 198   2019

  34. A cold/ultracold neutron detector using fine-grained nuclear emulsion with spatial resolution less than 100 nm

    Naganawa N., Ariga T., Awano S., Hino M., Hirota K., Kawahara H., Kitaguchi M., Mishima K., Shimizu H. M., Tada S., Tasaki S., Umemoto A.

    EUROPEAN PHYSICAL JOURNAL C   Vol. 78 ( 11 )   2018.11

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    DOI: 10.1140/epjc/s10052-018-6395-7

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  35. Pendellosung interferometry by using pulsed neutrons

    Itoh Shigeyasu, Nakaji Masaya, Uchida Yuya, Kitaguchi Masaaki, Shimizu Hirohiko M.

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 908   page: 78-81   2018.11

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    DOI: 10.1016/j.nima.2018.08.043

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  36. Characterization of germanium detectors for the measurement of the angular distribution of prompt γ-rays at the ANNRI in the MLF of the J-PARC Reviewed

    S. Takada, T. Okudaira, F. Goto, K. Hirota, A. Kimura, M. Kitaguchi, J. Koga, T. Nakao, K. Sakai, H. M. Shimizu, T. Yamamoto, T. Yoshioka

    Journal of Instrumentation   Vol. 13 ( 2 )   2018.2

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    © 2018 IOP Publishing Ltd and Sissa Medialab. In this study, the germanium detector assembly, installed at the Accurate Neutron-Nuclear Reaction measurement Instruments (ANNRI) in the Material and Life Science Facility (MLF) operated by the Japan Proton Accelerator Research Complex (J-PARC), has been characterized for extension to the measurement of the angular distribution of individual γ-ray transitions from neutron-induced compound states. We have developed a Monte Carlo simulation code using the GEANT4 toolkit, which can reproduce the pulse-height spectra of γ-rays from radioactive sources and (n,γ) reactions. The simulation is applicable to the measurement of γ-rays in the energy region of 0.5-11.0 MeV.

    DOI: 10.1088/1748-0221/13/02/P02018

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  37. Towards a high-resolution TOF-MIEZE spectrometer with very cold neutrons

    Oda T., Hino M., Kitaguchi M., Filter H., Geltenbort P., Kawabata Y.

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 860   page: 35-41   2017.7

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    DOI: 10.1016/j.nima.2017.03.014

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  38. Supermirror neutron guide system for neutron resonance spin echo spectrometers at a pulsed neutron source Reviewed

    Masahiro Hino, Tatsuro Oda, Norifumi L. Yamada, Hitoshi Endo, Hideki Seto, Masaaki Kitaguchi, Masahide Harada, Yuji Kawabata

    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY   Vol. 54 ( 11 ) page: 1223 - 1232   2017

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    A neutron guide system for neutron resonance spin echo spectrometers has been constructed at BL06 of the Japan Proton Accelerator Research Complex, Materials and Life Science Experimental Facility. The spectrometers consist of two types of neutron spin echo instruments, a modulated intensity by zero effort instrument (MIEZE) and a neutron resonance spin echo instrument (NRSE), to cover a wide energy range for various sample environments. A neutron beam from the moderator is deflected by supermirror neutron guides, split, and separately guided into the MIEZE and NRSE. The characteristic wavelengths of the neutron guide tube for the MIEZE and NRSE are 2.9 and 4.9 angstrom, respectively. The cross sections of the exit of the MIEZE and NRSE guides are 15mmx 50mm and 30mmx 50mm, respectively. The neutronics and shielding design were optimized by using the heavy ion transport code system (PHITS), and the absolute average neutron fluxes at the exits of the MIEZE and NRSE guides are estimated to be 2.7x 10(8) and 6.9x 10(8) n/cm(2)/s/MW, respectively. The measured fluxes of the MIEZE and NRSE neutron guides are 0.56 and 0.95times the calculated values, respectively.

    DOI: 10.1080/00223131.2017.1359699

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  39. Pulsed neutron time-dependent intensity modulation for quasi-elastic neutron scattering spectroscopy

    Oda T., Hino M., Kitaguchi M., Geltenbort P., Kawabata Y.

    REVIEW OF SCIENTIFIC INSTRUMENTS   Vol. 87 ( 10 )   2016.10

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    DOI: 10.1063/1.4965835

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  40. The MTV experiment: searching for T-violation in polarized Li-8 at TRIUMF International coauthorship International journal

    Murata J., Baba H., Behr J. A., Goto F., Inaba S., Kawamura H., Kitaguchi M., Levy C. D. P., Masuda H., Nakaya Y., Ninomiya K., Onishi J., Openshaw R., Pearson M., Sakamoto Y., Shimizu H., Shimizu Y., Tanaka S., Tanaka Y., Tanuma R., Totsuka Y., Watanabe E., Yokohashi M.

    HYPERFINE INTERACTIONS   Vol. 237   2016.8

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    DOI: 10.1007/s10751-016-1336-z

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  41. Pulsed ultra-cold neutron production using a Doppler shifter at J-PARC Reviewed

    S. Imajo, K. Mishima, M. Kitaguchi, Y. Iwashita, N. L. Yamada, M. Hino, T. Oda, T. Ino, H. M. Shimizu, S. Yamashita, R. Katayama

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS   Vol. 2016 ( 1 )   2016.1

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    We have constructed a Doppler-shifter-type pulsed ultra-cold neutron (UCN) source at the Materials and Life Science Experiment Facility of the Japan Proton Accelerator Research Complex. Very cold neutrons (VCNs) with 136 ms(-1) velocity in a neutron beam supplied by a pulsed neutron source are decelerated by reflection on an m = 10 wide-band multilayer mirror, yielding pulsed UCNs. The mirror is fixed to the tip of a 2000 rpm rotating arm moving with 68 ms(-1) velocity in the same direction as the VCNs. The repetition frequency of the pulsed UCNs is 8.33 Hz and the time width of the pulse at production is 4.4 ms. In order to increase the UCN flux, a supermirror guide, wide-band monochromatic mirrors, focus guides, and a UCN extraction guide have been newly installed or improved. The 1 MW-equivalent count rate of the output neutrons with longitudinal wavelengths longer than 58 nm is 1.6 x 10(2) cps, while that of the true UCNs is 80 cps. The spatial density at production is 1.4 UCN cm(-3). This new UCN source enables us to research and develop apparatuses necessary for the investigation of the neutron electric dipole moment.

    DOI: 10.1093/ptep/ptv177

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  42. Development of time projection chamber for precise neutron lifetime measurement using pulsed cold neutron beams Reviewed

    Y. Arimoto, N. Higashi, Y. Igarashi, Y. Iwashita, T. Ino, R. Katayama, M. Kitaguchi, R. Kitahara, H. Matsumura, K. Mishima, N. Nagakura, H. Oide, H. Otono, R. Sakakibara, T. Shima, H. M. Shimizu, T. Sugino, N. Sumi, H. Sumino, K. Taketani, G. Tanaka, M. Tanaka, K. Tauchi, A. Toyoda, T. Tomita, T. Yamada, S. Yamashita, H. Yokoyama, T. Yoshioka

    Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   Vol. 799   page: 187 - 196   2015.11

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    © 2015 Elsevier B.V. All rights reserved. A new time projection chamber (TPC) was developed for neutron lifetime measurement using a pulsed cold neutron spallation source at the Japan Proton Accelerator Research Complex (J-PARC). Managing considerable background events from natural sources and the beam radioactivity is a challenging aspect of this measurement. To overcome this problem, the developed TPC has unprecedented features such as the use of polyether-ether-ketone plates in the support structure and internal surfaces covered with <sup>6</sup>Li-enriched tiles to absorb outlier neutrons. In this paper, the design and performance of the new TPC are reported in detail.

    DOI: 10.1016/j.nima.2015.08.006

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  43. The ion beam sputtering facility at KURRI: Coatings for advanced neutron optical devices Reviewed

    Masahiro Hino, Tatsuro Oda, Masaaki Kitaguchi, Norifumi L. Yamada, Seiji Tasaki, Yuji Kawabata

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 797   page: 265 - 270   2015.10

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    We describe a film coating facility for the development of multilayer mirrors for use in neutron optical devices that handle slow neutron beams. Recently, we succeeded in fabricating a large neutron supermirror with high reflectivity using an ion beam sputtering system (KUR-IBS), as well as all neutron supermirrors in two neutron guide tubes at BLDG atl-PARC/MLF. We also realized a large flexible selfstanding fn-5 NiC/Ti supermirror and very small d-spacing (d =1.65 rim) multilayer sheets. In this paper, we present an overview of the performance and utility of non-magnetic neutron multilayer mirrors fabricated with the KUR-IBS (C) 2015 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.nima.2015.06.046

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  44. Pulsed neutron-beam focusing by modulating a permanent-magnet sextupole lens Reviewed

    Masako Yamada, Yoshihisa Iwashita, Masahiro Ichikawa, Yasuhiro Fuwa, Hiromu Tongu, Hirohiko M. Shimizu, Kenji Mishima, Norifumi L. Yamada, Katsuya Hirota, Yoshie Otake, Yoshichika Seki, Yutaka Yamagata, Masahiro Hino, Masaaki Kitaguchi, Ulf Garbe, Shane J. Kennedy, Wai Tung Lee, Ken H. Andersen, Bruno Guerard, Giuliana Manzin, Peter Geltenbort

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS   Vol. 2015 ( 4 )   2015.4

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    We have developed a compact permanent-magnet sextupole lens for neutrons that can focus a pulsed beam with a wide wavelength range-the maximum wavelength being more than double the minimum-while sufficiently suppressing the effect of chromatic aberration. The bore diameter is o15 mm. Three units of a double-ring sextupole with a length of 66 mm are cascaded, resulting in a total length of 198 mm. The dynamic modulation range of the unit-averaged field gradient is 1.06 x 10(4)-5.86 x 10(4) Tm-2. Permanent magnets and newly developed torque-canceling elements make the device compact, its production costs low, and its operation simpler than that of other magnetic lenses. The efficacy of this lens was verified using very cold neutrons. The diameter of the focused beam spots over the wavelength range of 27-55 angstrom was the same as that of the source aperture (2 mm diameter) when the magnification of the optical arrangement was unity. The total beam flux over this wavelength range was enhanced by a factor of 43. The focusing distance from the source to the detector was 1.84 m. In addition, in a demonstration of neutron image magnification, the image of a sample mask magnified by a factor of 4.1 was observed when the magnification of the optical arrangement was 5.0.

    DOI: 10.1093/ptep/ptv015

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  45. Development of a new neutron mirror made of deuterated Diamond-like carbon Reviewed

    Sakurai, Dai, Chiba, Junsei, Ino, Takashi, Kakusho, Nobunori, Kaneko, Naokatsu, Katayama, Ryo, Kitaguchi, Masaaki, Mishima, Kenji, Muto, Suguru, Ozeki, Kazuhide, Seki, Yoshichika, Shimizu, Hirohiko M., Yamashita, Satoru, Yoshioka, Tamaki, Nishimura, Daiki

    INTERNATIONAL WORKSHOP ON NEUTRON OPTICS AND DETECTORS (NOP&D 2013)   Vol. 528   2014

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    We developed a new neutron mirror made of Diamond-like carbon (DLC). DLC is a film of amorphous carbon that has characteristics of both diamond and graphite. We produced DLC mirrors by ionization deposition method which is one of the chemical vapor deposition (CVD). Generally, DLC made by CVD contents a few tens of percentages of hydrogen. It decreases the Fermi potential of the DLC coating because hydrogen has negative Fermi potential. In order to increase the Fermi potential of the coating, we deuterated the DLC by using deuterated benzene for the source gas. The characteristics of the deuterated DLC(DDLC) coating was evaluated by RBS, ERDA, x-ray reflectivity, AFM. As a result, DDLC coating has 243neV due to deuteration, which is the same level as Ni. The RMS of height of the DDLC was 0.6nm so that the DDLC coating can be applied for a focusing mirror or specular transportation of pulsed neutron. Besides, we also develop Hydrogen/Deuterium DLC multiple layer mirror. So far, 4 layers mirror has been succeeded.

    DOI: 10.1088/1742-6596/528/1/012010

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  46. Production of Ultra Cold Neutrons by a Doppler Shifter with Pulsed Neutrons at J-PARC Reviewed

    K. Mishima, S. Imajo, M. Hino, T. Ino, Y. Iwashita, R. Katayama, M. Kitaguchi, T. Oda, H. M. Shimizu, M. Utsuro, S. Yamashita, T. Yoshioka

    INTERNATIONAL WORKSHOP ON NEUTRON OPTICS AND DETECTORS (NOP&D 2013)   Vol. 528   2014

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    Ultracold neutrons (UCNs) are neutrons whose kinetic energy is around a few hundred nanoelectronvolts. Neutrons with such small kinetic energy can be trapped in a material vessel or magnetic fields. Because of these unique characteristics, UCNs are used for some important experiments of fundamental physics. The Doppler shifter is a device to produce UCN by slowing them down by the reflection on a mirror moving with half of the velocity of incoming neutrons. A Doppler shifter using a quadruple-stack of monochromatic supermin-ors that reflects neutrons with a velocity around 68m/s [1, Hino et al. (2010)] was fabricated, and operated with a pulsed neutron source of J-PARC. An important feature of the Doppler shifter is the use of a pulsed neutron beam Unlike in continuous neutron beams, the neutron velocity can be selected by choosing a time slice in a pulsed neutron bunch. Thus the UCN production improves by similar to 80 times in the case of J-PARC. We successfully produced the UCNs by the Doppler shifter: the measured UCN production rate is consistent with the simulations.

    DOI: 10.1088/1742-6596/528/1/012030

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  47. Development of a simulation for measuring neutron electric dipole moment Reviewed

    Ryo Katayama, Kenji Mishima, Satoru Yamashita, Dai Sakurai, Masaaki Kitaguchi, Tamaki Yoshioka, Yoshichika Seki

    INTERNATIONAL WORKSHOP ON NEUTRON OPTICS AND DETECTORS (NOP&D 2013)   Vol. 528   2014

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    The neutron electric dipole moment (nEDM) is sensitive to new physics beyond the standard model and could prove to be a new source of CP violation. Several experiments are being planned worldwide for its high-precision measurement. The nEDM is measured as the ultracold neutron (UCN) spin precession in a storage bottle under homogeneous electric and magnetic fields. In nEDM measurement, the systematic uncertainties are due to the motion of the UCNs, the geometry of the measurement system, and inhomogeneous electric and magnetic fields. Therefore, it is essential to quantitatively understand these effects in order to reduce them. Geant4UCN is an ideal simulation framework because it can compute the UCN trajectory, evaluate the time evolution of the spin precession due to arbitrary electric and magnetic fields, and define the storage geometry flexibly. We checked how accurately Geant4UCN can calculate the spin precession. We found that because of rounding errors, it cannot simulate it accurately enough for nEDM experiments, assuming homogeneous electric and magnetic fields with strengths of 10 kV/cm and 1 mu T, respectively, and 100 s of storage. In this paper, we report on its discrepancies and describe a solution.

    DOI: 10.1088/1742-6596/528/1/012031

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  48. Development of two-dimensional multiwire-type neutron detector system with individual line readout and optical signal transmission Reviewed

    K. Toh, T. Nakamura, K. Sakasai, K. Soyama, M. Hino, M. Kitaguchi, H. Yamagishi

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 726   page: 169 - 174   2013.10

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    A multiwire-type two-dimensional neutron detector system with a sensitive area of 128 x 128 mm(2) is developed for use in the Materials and Life Science Experimental Facility at the Japan Proton Accelerator Research Complex. The system can achieve a short response time and high spatial resolution using the individual line readout method. Optical devices have been incorporated in the system for long-distance signal transmission and insulation between a detector head in the neutron shielding and signal processing circuits in the data acquisition room. The detector system exhibits a pulse-pair resolution of 1 mu s, an average spatial resolution of less than 2 mm full width at half-maximum in the sensitive region, and a two-dimensional homogeneity of 8.3% in all pixels. (C) 2013 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.nima.2013.05.118

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  49. Numerical simulation of a beam divergence correction for NRSE spectrometer using polygonal 2D-focusing supermirrors Reviewed

    Tatsuro Oda, Masahiro Hino, Masaaki Kitaguchi, Yuji Kawabata

    Physics Procedia   Vol. 42   page: 121 - 124   2013

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    By inserting two-dimensional (2D) elliptical focusing mirrors between each pair of RSFs in neutron resonance spin echo spectrometer, the flight path lengths between the pair of RSFs can be made equal even for any divergent beam. We investigate numerically the feasibility of using polygonal 2D elliptical focusing mirrors as beam correction devices, and we show the relation of the energy resolution and the neutron intensity including effect of gravity. © 2013 The Authors.

    DOI: 10.1016/j.phpro.2013.03.184

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  50. Current status of BL06 beam line for VIN ROSE at J-PARC/MLF Reviewed

    Masahiro Hino, Tatsuro Oda, Masaaki Kitaguchi, Norifumi L. Yamada, Hidenori Sagehashi, Yuji Kawabata, Hideki Seto

    9TH INTERNATIONAL CONFERENCE ON POLARISED NEUTRONS IN CONDENSED MATTER INVESTIGATIONS   Vol. 42   page: 136 - 141   2013

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    We started to construct new beam line for neutron spin echo spectrometers (VIN ROSE) at BL06 J-PARC/MLF from FY2011. The advantage of MIEZE is flexible sample environment and polarimetry analysis. The key device of NRSE is focusing mirror and high-m polarizing device. Both spectrometers are to use intensity gain of J-PARC and dedicated for small sample size. In this study, we show conceptional design of the VIN ROSE and current status of the BL06 beam line at J-PARC/MLF. (C) 2013 The Authors. Published by Elsevier B.V.

    DOI: 10.1016/j.phpro.2013.03.187

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  51. Demonstration of focusing by a neutron accelerator Reviewed

    Yasushi Arimoto, Peter Gertenbort, Sohei Imajo, Yoshihisa Iwashita, Masaaki Kitaguchi, Yoshichika Seki, Hirohiko M. Shimizu, Tamaki Yoshioka

    Physical Review A   Vol. 86   page: 023843   2012.8

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  52. Demonstration of optical thickness measurement using multilayer cold neutron interferometer Reviewed

    Y. Seki, J. Uda, H. Funahashi, M. Kitaguchi, M. Hino, Y. Otake, K. Taketani, H. M. Shimizu

    5TH EUROPEAN CONFERENCE ON NEUTRON SCATTERING   Vol. 340   2012

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    We have measured the optical thickness of a phase object for the first time using multilayer cold neutron interferometer. The measured phase shift of 15.1 +/- 1.9 wavelength agreed with the expected value of 17.4 +/- 0.7 wavelength due to an about 600-mu m-thick silicon plate. This demonstration reconfirmed that two paths in our new interferometer were completely separate, and showed its applicability into various precise measurements.

    DOI: 10.1088/1742-6596/340/1/012039

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  53. Research toward the development of compact neutron interference imaging instrument with gratings Reviewed

    Yoshie Otake, Margie Olbinado, Yoshichika Seki, Katsuya Hirota, Yutaka Yamagata, Jungmyoung Ju, Tomohiro Adachi, Shinya Morita, Yoshihisa Iwashita, Masahiro Hino, Masahiro Ichikawa, Masaaki Kitaguchi, Toshio Takahashi, Hideki Yoshizawa, Seung Wook Lee, Wataru Yashiro, Atsushi Momose

    5TH EUROPEAN CONFERENCE ON NEUTRON SCATTERING   Vol. 340   2012

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    The neutron interference imaging experiment with two absorption gratings has been done. We develop new way to fabricate absorption gratings for neutron with the pitch of 150 mu m, 180 mu m, and 200 mu m. Compact imaging detector system is developed, whose weight is 2kg. Small break in an acrylic plate, the welded place of Nb plate were observed, it reveals that the neutron interference imaging method can become new method of a nondestructive inspection for reinforced plastics and composite material such as CFRP and so on.

    DOI: 10.1088/1742-6596/340/1/012035

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  54. Present status of neutron fundamental physics at J-PARC Reviewed

    Yasushi Arimoto, Haruhiko Funahashi, Nao Higashi, Masahiro Hino, Katsuya Hirota, Shohei Imajo, Takashi Ino, Yoshihisa Iwashita, Ryo Katayama, Masaaki Kitaguchi, Kenji Mishima, Suguru Muto, Hideyuki Oide, Hidetoshi Otono, Yoshichika Seki, Tatsushi Shima, Hirohiko M. Shimizu, Kaoru Taketani, Takahiro Yamada, Satoru Yamashita, Tamaki Yoshioka

    Progress of Theoretical and Experimental Physics   Vol. 2012 ( 1 )   2012

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    © The Author(s) 2012. A neutron beamline for the study of fundamental physics has been constructed at the spallation neutron source of the Japan Proton Accelerator Research Complex (J-PARC). In-flight measurement of the neutron lifetime and the development of the transport optics of ultracold neutrons are in progress. The present status of the beamline and these experiments is reported.

    DOI: 10.1093/ptep/pts075

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  55. Development of Two-Dimensional Scintillation Detectors for Neutron Spin Echo Spectrometers in J-PARC/MLF Reviewed

    T. Nakamura, M. Katagiri, T. Hosoya, K. Toh, M. Kitaguchi, M. Hino, T. Ebisawa, K. Sakasai, K. Soyama

    2012 IEEE NUCLEAR SCIENCE SYMPOSIUM AND MEDICAL IMAGING CONFERENCE RECORD (NSS/MIC)     page: 222 - 225   2012

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    A two-dimensional scintillation detector comprising of a single screen of flat neutron-sensitive scintillator with wavelength shifting fibers read out was developed. The detector was designed to meet the requirements for the modulated intensity by zero effort spectrometer (MIEZE) to be installed in the J-PARC/MLF. The ZnS/(B2O3)-B-10 scintillator screen that had 0.2 +/- 0.05 mm in thickness was implemented to the detector to minimize the time parallax within the scintillator. The detector design and the detector performances are presented.

    DOI: 10.1109/NSSMIC.2012.6551098

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  56. Development of longitudinal-gradient magnet for time focusing of ultra-cold neutron with anisotropic inter-pole Reviewed

    Yasushi Arimoto, Yoshihisa Iwashita, Tamaki Yoshioka, Masaaki Kitaguchi, Sohei Imajo, Hirohiko M. Shimizu, Koichiro Asahi, Takashi Ino, Yoshio Kamiya, Kenji Mishima, Suguru Muto, Kenji Sakai, Tatsushi Shima, Kaoru Taketani, Satoru Yamashita, Akihiro Yoshimi

    IEEE Transactions on Applied Superconductivity   Vol. 22 ( 3 )   2012

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    Ultra-cold neutron (UCN) is attractive for a search of the neutron electric dipole moment (nEDM). It is crucial to store UCNs with high density in a bottle for nEDM measurement apparatus. To increase the density, time focusing technique can be useful, where slow neutrons are accelerated and fast neutrons are decelerated by using magnetic potential. This device is called rebuncher. The rebuncher consists of a gradient magnet, RF coil, and neutron guide. The magnet generates a field gradient of 3.5 T/m (from 1 T to 0.2 T within 24 cm) in the longitudinal direction. By using anisotropic inter-poles, the magnet is compact and keeps the gradient uniform. The fabricated magnet showed good performance as designed. © 2012 IEEE.

    DOI: 10.1109/TASC.2012.2183569

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  57. A compact TOF-SANS using focusing lens and very cold neutrons Reviewed

    Masako Yamada, Yoshihisa Iwashita, Toshiji Kanaya, Norifumi L. Yamada, Hirohiko M. Shimizu, Kenji Mishima, Masahiro Hino, Masaaki Kitaguchi, Katsuya Hirota, Peter Geltenbort, Bruno Guerard, Giuliana Manzin, Ken Anderson, Jyotsana Lal, John M. Carpenter, Markus Bleuel, Shane J. Kennedy

    PHYSICA B-CONDENSED MATTER   Vol. 406 ( 12 ) page: 2453 - 2457   2011.6

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    We are developing a high-resolution small angle neutron scattering instrument for very cold neutrons (VCN). Our concept includes a magnetic lens for focusing of the beam at the detector plane. The lens consists of one permanent-magnet sextupole array rotating outside another stationary sextupole array, to focus a pulsed white beam of neutrons. Thus the instrument operates in time of flight mode. The prototype magnetic lens has a bore of 15 mm diameter and length of 66 mm, producing a magnetic field gradient oscillating from 1.5 x 10(4) to 5.9 x 10(4) T/m(2), with frequency &lt;= 25 Hz. A torque-canceling magnet around the lens suppresses the torque of rotation from the outer array to 1/3.
    We have demonstrated the performance of the lens, over wavelength range from 30 to 48 angstrom, on the PF2-VCN beam line at the Institut Laue-Langevin, France. The focused beam image was the same size as the source, without chromatic aberration, with focal length of 1.14 m. We also studied the performance of this configuration for high-resolution SANS, in a compact geometry (just 5 m long). The measurable q range of this system was 0.009 angstrom(-1) &lt;= q &lt;= 0.3 angstrom(-1) or 0.004 angstrom(-1) &lt;= q &lt;= 0.08 angstrom(-1) for sample to detector distances of 100 and 465 mm, respectively. Here, we present the results of our lens characterization study along with the SANS results on a tri-block copolymer (F127 Pluronic) and on a stretched polymer blend (with the Shish-Kebab structure). (C) 2010 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2010.12.002

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  58. High resolution NRSE spectrometer with 2D-focusing supermirrors Reviewed

    Masaaki Kitaguchi, Masahiro Hino, Yuji Kawabata, Seiji Tasaki, Ryuji Maruyama, Toru Ebisawa

    PHYSICA B-CONDENSED MATTER   Vol. 406 ( 12 ) page: 2470 - 2472   2011.6

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    In the neutron resonance spin echo (NRSE) spectrometer [1] the divergent beam provides the deviation of the flight length, which makes the phase difference between neutron spin states and also decreases the contrast of the spin echo signals. The flight length can be adjusted by using parabolic focusing mirrors [11], which can be fabricated with replica technique. Correction for beam divergence effect in the NRSE spectrometer using 2D-focusing supermirrors will be discussed. (C) 2010 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2010.11.062

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  59. A high S/N ratio spin flip chopper system for a pulsed neutron source Reviewed

    K. Taketani, T. Ebisawa, M. Hino, K. Hirota, T. Ino, M. Kitaguchi, K. Mishima, S. Muto, H. Oide, T. Oku, H. Otone, K. Sakai, T. Shima, H. M. Shimizu, S. Yamashita, T. Yoshioka

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 634   page: S134 - S137   2011.4

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    We report a successful demonstration of a high SIN ratio spin flip chopper (SFC) system for pulsed neutron sources. The system consists of two SFCs and each SFC consists of a radio frequency (RF) flipper and Soller magnetic supermirrors. The aperture of the Soller mirror was 18 mm in width and 20 mm in height. The S/N ratio of the system was 306:1. This system is going to be installed to measure neutron lifetime precisely using the cold-neutron beam line, BL05 polarized-beam branch, at the Materials and Life Science Experimental Facility (MLF) in Japan Proton Accelerator Research Complex (J-PARC). (C) 2010 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.nima.2010.06.357

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  60. The performance of magnetic lens for focusing VCN-SANS Reviewed

    M. Yamada, Y. Iwashita, T. Kanaya, M. Ichikawa, H. Tongu, S. J. Kennedy, H. M. Shimizu, K. Mishima, N. L. Yamada, K. Hirota, J. M. Carpenter, J. Lal, K. Andersen, P. Geltenbort, B. Guerard, G. Manzin, M. Hino, M. Kitaguchi, M. Bleuel

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 634   page: S156 - S160   2011.4

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    We have developed a prototype rotating-permanent magnet sextupole lens (named rot-PMSx) for more efficient experiments with neutron beams in time of flight (ToF) mode. This lens can modulate the focusing strength over range 1.5 x 10(4)T/m(2) &lt;= g&apos; &lt;= 5.9 x 10(4) T/m(2). Synchronization between the modulation and the beam pulse produces a focused beam without significant chromatic aberration. We anticipate that this lens could be utilized in focusing small angle neutron scattering (SANS) instruments for novel approach to high resolution SANS.
    We carried out experiments testing the principle of this lens at the very cold neutron (VCN) beamline (PF2) at Institut Laue-Langevin (ILL), France. The focused beam image size at the detector was kept constant at the same beam size as the source (approximate to 3 mm) over a wavelength range of 30 angstrom &lt;= lambda &lt;= 48 angstrom in focal length of approximate to 1.14m. The flux gain was about 12 relative to a beam without focusing, and the depth of focus was quite large. These results show the good performance of this lens and the system. Thereupon we have demonstrated the performance of this test bed for high resolution focusing of VCN-SANS for a well-studied softmatter sample; a deuterium oxide solution of Pluronic F127, an (PEO)(100)(PPO)(65)(PEO)(100) tri-block copolymer in deuterium oxide. The results of the focusing experiment and the focusing VCN-SANS are presented. (C) 2010 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.nima.2010.06.259

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  61. Polarization of very cold neutron using a permanent magnet quadrupole Reviewed

    Tamaki Yoshioka, Kenji Mishima, Takashi Ino, Kaoru Taketani, Suguru Muto, Takahiro Morishima, Hirohiko M. Shimizu, Takayuki Oku, Junichi Suzuki, Takenao Shinohara, Kenji Sakai, Hiromi Sato, Katsuya Hirota, Yoshie Otake, Masaaki Kitaguchi, Masahiro Hino, Yoshichika Seki, Yoshihisa Iwashita, Masako Yamada, Masahiro Ichikawa, Takanori Sugimoto, Shinsuke Kawasaki, Sachio Komamiya, Hidetoshi Otono, Yoshio Kamiya, Satoru Yamashita, Peter Geltenbort

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 634   page: S17 - S20   2011.4

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    For the future fundamental physics experiments by using cold neutrons, we are developing a device which can measure the neutron polarization degree by accuracy significantly below 10(-3). A quadrupole magnet is one of the promising candidate to measure the neutron polarization degree by such extremely high precision. We have performed a polarization experiment by using the quadrupole magnets at the Very Cold Neutron (VCN) port of the PF-2 in the Institute Laue-Langevin (ILL). As a result, we obtained the polarization degree P with very high accuracy P=0.9994 +/- 0.0001(stat.) +/- 0.0003(syst.), which meet our requirement significantly. (C) 2010 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.nima.2010.05.029

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  62. A transport optics for pulsed ultracold neutron sources Reviewed

    H. M. Shimizu, Y. Iwashita, M. Kitaguchi, K. Mishima, T. Yoshioka

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 634   page: S25 - S27   2011.4

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    High-density ultracold neutron (UCN) is commonly desired for the improvement of the experimental sensitivity to measure the electric dipole moment of neutrons. We discuss a method to suppress the decrease of the UCN density in transporting UCNs to the spatially separated storage volume by changing the UCN velocity synchronizing to the UCN time-of-flight. (C) 2010 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.nima.2010.06.210

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  63. Longitudinal-gradient magnet for time focusing of ultra-cold neutrons Reviewed

    Y. Arimoto, T. Yoshioka, H. M. Shimizu, K. Mishima, T. Ino, K. Taketani, S. Muto, M. Kitaguchi, S. Imajo, Y. Iwashita, S. Yamashita, Y. Kamiya, A. Yoshimi, K. Asahi, T. Shima, K. Sakai

    2ND INTERNATIONAL WORKSHOP ON THE PHYSICS OF FUNDAMENTAL SYMMETRIES AND INTERACTIONS (PSI)   Vol. 17   2011

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    A gradient DC magnet is designed using 3D magnetic field analysis code. This magnet, referred to as a B-0 magnet, is one of the key elements of a time-focusing device for ultra-cold neutrons (UCNs) based on a radio frequency gradient flipper - a so-called rebuncher. The magnet generates a guide and a potential field that interacts with the magnetic moment of UCNs and its main body comprises a C-shaped yoke made from iron. A field gradient is generated by a pole arrangement that includes an anisotropic inter-pole, which causes the fringe field to be uniform in the longitudinal direction even when the pole gap distance changes. The designed magnet has the following properties: (1) a maximum B-field of 10 kGauss, decreasing to 2 kGauss at a longitudinal distance of 25 cm, with a gradient of less than 400 Gauss/cm, (2) variations in the fringe field along the y direction is less than 4% over a range of -3 cm &lt;= y &lt;= 3 cm at any z position in the spin-flipping region. Tracking simulations show that the B-0 magnet is capable of accepting UCNs in the velocity range 2.3 similar to 3.3 m/s.

    DOI: 10.1016/j.phpro.2011.06.013

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  64. Multilayer Neutron Interferometer with Complete Path Separation Reviewed

    Yoshichika Seki, Haruhiko Funahashi, Masaaki Kitaguchi, Masahiro Hino, Yoshie Otake, Kaoru Taketani, Hirohiko M. Shimizu

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   Vol. 79 ( 12 )   2010.12

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    We have developed a new multi layer cold-neutron interferometer using a pair of beam splitting etalons (BSEs) with an air gap of 189 mu m in spacing. This is the first multilayer neutron interferometer that separates two paths from each other completely without an overlap. Clear interference fringes with a contrast of 67% have been observed using a monochromatic cold-neutron beam with a wavelength of 0.88 nm.

    DOI: 10.1143/JPSJ.79.124201

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  65. Highly polarized very cold neutrons through a permanent magnet quadrupole Reviewed

    Kaoru Taketani, Kenji Mishima, Takashi Ino, Tamaki Yoshioka, Suguru Muto, Takahiro Morishima, Hirohiko M. Shimizu, Takayuki Oku, Junichi Suzuki, Takenao Shinohara, Kenji Sakai, Hiromi Sato, Katsuya Hirota, Yoshie Otake, Masaaki Kitaguchi, Masahiro Hino, Yoshichika Seki, Yoshihisa Iwashita, Masako Yamada, Masahiro Ichikawa, Takanori Sugimoto, Shinsuke Kawasaki, Sachio Komamiya, Yoshio Kamiya, Hidetoshi Otono, Satoru Yamashita, Peter Geltenbort

    Physica B: Condensed Matter   Vol. 404 ( 17 ) page: 2643 - 2645   2009.9

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    We obtained highly polarized very cold neutrons through a quadrupole magnet with a large aperture. When neutrons go through a quadrupole magnet, parallel-spin neutrons are attracted to the magnet axis and anti-parallel-spin neutrons are repelled off the axis. Therefore, the neutrons through a sufficiently long quadrupole magnet have completely parallel-spin. At the downstream of the quadrupole magnet, we placed another quadrupole magnet to divide neutrons into two regions depending on their spin directions. We obtained the neutron polarization from the integrated count of the two regions and found it was 99.88±0.09 (stat.)±0.05 (syst.)%. © 2009 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2009.06.045

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  66. A new MIEZE technique for investigating relaxation of magnetic nanoparticles Reviewed

    Hirotoshi Hayashida, Masahiro Hino, Masaaki Kitaguchi, Norio Achiwa, Yuji Kawabata

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 600 ( 1 ) page: 56 - 59   2009.2

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    There is no reduction in the contrast of a modulated intensity of zero effort (MIEZE) signal even when magnetic scattering occurs, whereas the contrasts of neutron spin echo and neutron resonance spin echo are reduced by more than a factor of two. However, since MIEZE measures both the intensities of quasielastic nuclear and magnetic scatterings, it is generally not easy to use a conventional MIEZE setup to simultaneously separate magnetic and nonmagnetic fluctuations of magnetic nanoscale particles. We propose a new MIEZE technique, which involves inserting a second analyzer and an additional pi-flipper that is able to distinguish between the magnetic and nonmagnetic quasielastic scattering intensities. We succeeded in observing superparamagnetic fluctuations of magnetite particles in a ferrofluid by using this new technique. (C) 2008 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.nima.2008.11.101

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  67. Shield evaluation of cold neutron curved guide tubes for J-PARC neutron resonance spin echo spectrometers Reviewed

    Toru Ebisawa, Kazuhiko Soyama, Dai Yamazaki, Ryuji Maruyama, Seiji Tasaki, Yutaka Abe, Hiroyuki Hayashida, Masahiro Hino, Masaaki Kitaguchi, Yuji Kawabata, Koji Niita

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 600 ( 1 ) page: 126 - 128   2009.2

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    it is planned that three neutron resonance spin echo spectrometers will be installed in the No. 17 beam port of JSNS. In order to install these three spectrometers in one beam port, the neutron incident beam system to be installed in No. 17 port cannot only supply three polarized neutron beams to these spectrometers, but should also create very low background levels of neutron and gamma rays in the experimental area. We report based on shield evaluations how to realize the low background level by using two highly curved neutron guide tubes with high quality supermirrors. (C) 2008 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.nima.2008.11.090

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  68. Development of devices for beam divergence correction in the high-resolution NRSE spectrometer Reviewed

    Masaaki Kitaguchi, Masahiro Hino, Yuji Kawabata, Hirotoshi Hayashida, Seiji Tasaki, Ryuji Maruyama, Toru Ebisawa

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 600 ( 1 ) page: 117 - 119   2009.2

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    Correction for beam divergence effect in the neutron resonance spin echo (NRSE) spectrometer will be discussed. The new type of devices called "coupling coils" is proposed to change the spin quantization axis for the correction. The feasibility of correction for the vertical divergence has been demonstrated by numerical calculations and Monte-Carlo simulations. (C) 2008 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.nima.2008.11.072

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  69. A study on reflectivity limit of neutron supermirror Reviewed

    Masahiro Hino, Masaaki Kitaguchi, Hirotoshi Hayashida, Seiji Tasaki, Toru Ebisawa, Ryuji Maruyama, Norio Achiwa, Yuji Kawabata

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 600 ( 1 ) page: 207 - 209   2009.2

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    We have fabricated m=2.9 NiC/Ti supermirror on a silicon wafer in which surface roughness is about 0.4 nm by ion beam sputtering technique. The reflectivity of supermirror at m=2.8 and 2.9 were 0.94 and 0.90, respectively. The reflectivity, of 0.94 at m=2.8 is in the vicinity of theoretical limit including the effects of absorption and incoherent scattering. We show the experimental results and theoretical expectation based on a simple Debye-Waller roughness model, and discuss realistic reflectivity limit of supermirror deposited on the ordinary silicon substrate. (c) 2008 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.nima.2008.11.125

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  70. A CCD-based Pixel Detector with Micron Spatial Resolution for Ultra Cold Neutrons Reviewed

    Go Ichikawa, Shinsuke Kawasaki, Sachio Komamiya, Yoshio Kamiya, Tomoyuki Sanuki, Hirohiko M. Shimizu, Masahiro Hino, Masaaki Kitaguchi

    2009 IEEE NUCLEAR SCIENCE SYMPOSIUM CONFERENCE RECORD, VOLS 1-5     page: 1619 - +   2009

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    We have developed a pixel detector for ultra-cold neutrons using a commercial CCD. In order to detect neutrons, a thin neutron converting layer is directly formed on the CCD surface. The detection efficiencies for cold, very-cold and ultra-cold neutrons are measured to be 1.7%, 4.05 +/- 0.08 +/- 0.12% and 40.6 +/- 0.7 +/- 2.8%, respectively. The spatial resolutions were measured to be 2.9 +/- 0.1 mu m for horizontal direction and 4.4 +/- 0.2 mu m for vertical direction. The vertical and horizontal directions are determined by the charge transfer mechanism of CCDs. The details of the pixel detector and its performance tests are described.

    DOI: 10.1109/NSSMIC.2009.5402255

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  71. Observation of MIEZE signal with an effective frequency of 1 MHz Reviewed

    Hirotoshi Hayashida, Masaaki Kitaguchi, Masahiro Hino, Yuji Kawabata, Toru Ebisawa

    PHYSICA B-CONDENSED MATTER   Vol. 397 ( 1-2 ) page: 144 - 146   2007.7

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    We developed a modulated intensity of zero effort (MIEZE) spectrometer with an effective frequency of I MHz. Three resonance spin flippers (RSFs) and two-dimentional position sensitive detector (2D-PSD) were used for the MIEZE spectrometer. The frequency of RSFs was 0.5 MHz and 2D-PSD works in TOF mode with 100 ns. The incident neutron wavelength was 0.81 nm and the distance between sample position and detector position was 0.5 in. The Fourier time was estimated to be 1.7 ns. The contrast of the I MHz echo signal was 0.4. (c) 2007 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2007.02.087

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  72. Moire fringes in a neutron spin interferometer Reviewed

    Kaoru Taketani, Yoshichika Seki, Haruhiko Funahashi, Masahiro Hino, Masaaki Kitaguchi, Yoshic Otake, Hirohiko M. Shimizu

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   Vol. 76 ( 6 )   2007.6

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    We have revealed the criterion to observe moire fringes in a neutron spin interferometry. In former studies using wave front division, neutron beam had to be collimated by fine slits. On the other hand, we have succeeded to observe moire fringes with divergence angle of 8.3 mrad using spin polarization division. A model based on partial coherence theory has been developed and verified experimentally. These results will be the basis for neutron wave front manipulation technique using magnetic birefringence.

    DOI: 10.1143/JPSJ.76.064008

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  73. A test of MIEZE-reflectometer for study of surface and interface Reviewed

    Masahiro Hino, Masaaki Kitaguchi, Hirotoshi Hayashida, Yuji Kawabata, Seiji Tasaki, Toru Ebisawa, Dai Yamazaki, Ryuji Maruyama, Keiji Tanaka, Naoya Torikai, Rintaro Inoue, Toshiji Kanaya

    PHYSICA B-CONDENSED MATTER   Vol. 385-86   page: 1125 - 1127   2006.11

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    We have installed a MIEZE-type spin echo spectrometer at the C3-1-2-2 (MINE1) port at the JRR-3 M in the Japan Atomic Energy Agency. By combining neutron reflectometry and the MIEZE, it is possible to detect inelastic and quasi-elastic scattering on the surface and at the interface. We have succeeded in measuring a MIEZE signal for which the Fourier time is up to 0.8 us. Though the Fourier time is small, we tested several samples by the MIEZE reflectometer. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2006.05.388

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  74. Neutron resonance spin echo and MIEZE spectrometer development project in Japan Reviewed

    Yuji Kawabata, Masahiro Hino, Masaaki Kitaguchi, Hirotoshi Hayashida, Seiji Tasaki, Toru Ebisawa, Dai Yamazaki, Ryuji Maruyama, Hideki Seto, Michihiro Nagao, Toshiji Kanaya

    PHYSICA B-CONDENSED MATTER   Vol. 385-86   page: 1122 - 1124   2006.11

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    A project for the development of neutron spin echo spectrometers using neutron resonance spin flippers with a pulsed neutron source has been launched. The system consists of a set of three different machines, a MIEZE spectrometer, a high intensity NRSE spectrometer and a high energy resolution Neutron resonance spin echo (NRSE) spectrometer. The design target of this system when installed in J-PARC ;is as follows: (1) MIEZE: 0.01 &lt; Q &lt; 3.5 (I/A), 20 &lt; t &lt; 1300 (ps); (2) high intensity NRSE: 0.005 &lt; Q &lt; 3.1 (I/A), I &lt; t &lt; 170 (ns); (3) high resolution NRSE: 0.003 &lt; Q &lt; 1.2 (I/A), 0.03 &lt; t &lt; 1 (ps). (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2006.05.387

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  75. Moire fringes of cold neutron with large divergence angle Reviewed

    Kaoru Taketani, Haruhiko Funahashi, Yoshichika Seki, Masahiro Hino, Masaaki Kitaguchi, Yoshie Otake, Hirohiko M. Shimizu

    PHYSICA B-CONDENSED MATTER   Vol. 385-86   page: 1222 - 1224   2006.11

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    Moire fringes were observed as a bright and high-contrast image using a. neutron spin interferometer with a relatively divergent cold neutron beam at the MINE2 beam line of JRR-3M. The two spin states were selectively deflected with the relative angle in the range of 92-184 nrad on transmission through the magnetic field gradient in the range of 3.2-6.4 G/cm produced by a 5 cm long quadrupole electromagnet. We analyzed the result with a first-order calculation taking into account the finite beam divergence and found that the beam divergence is required to be less than the angular separation of individual Moire loci, for the observation of Moire fringes, and is not required to be less than the angular separation of the two beam paths. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2006.05.412

    Web of Science

  76. Development of neutron resonance spin flipper for high resolution NRSE spectrometer Reviewed

    Masaaki Kitaguchi, Masahiro Hino, Yuji Kawabata, Hirotoshi Hayashida, Seiji Tasaki, Ryuji Maruyama, Dai Yamazaki, Toru Ebisawa, Naoya Torikai

    PHYSICA B-CONDENSED MATTER   Vol. 385-86   page: 1128 - 1130   2006.11

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Neutron spin echo (NSE) is one of the techniques with the highest energy resolution for measurement of quasi-elastic scattering. In neutron resonance spin echo (NRSE), two separated neutron resonance spin flippers (RSFs) replace a homogeneous static magnetic field for spin precession in a conventional NSE. We have made a new type of RSF with pure aluminum wires in order to reduce the scattering from the surface. Test experiments have been performed at cold neutron beam line MINE1 at JRR-3M reactor in JAERI and the beam line CN3 at KUR The spin-flip probability was higher than 0.95 at a neutron wavelength of 0.81 ran and a RSF frequency of 100 kHz. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2006.05.389

    Web of Science

  77. Development of large-m polarizing neutron supermirror fabricated by using ion beam sputtering instrument at KURRI Reviewed

    Masahiro Hino, Hirotoshi Hayashida, Masaaki Kitaguchi, Yuji Kawabata, Masayasu Takeda, Ryuji Maruyama, Toru Ebisawa, Naoya Torikai, Tetsuya Kume, Seiji Tasaki

    PHYSICA B-CONDENSED MATTER   Vol. 385-86   page: 1187 - 1189   2006.11

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

    Authors have succeeded in fabricating m = 3.9 Fe/Si and m = 5 Fe/Ge polarizing neutron supermirrors with high reflectivity using ion beam sputtering instrument installed at KURRI. The reflectivity of up-spin neutron are above 0.80 and 0.67 for the m = 3.9 Fe/Si and m = 5 Fe/Ge supermirrors with external magnetic field of 45 mT, in which number of layers are 1600 and 3750, respectively. The polarization efficiencies are about 0.90. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physb.2006.05.404

    Web of Science

  78. Cold-neutron interferometry using beam splitting etalons Reviewed

    M Kitaguchi, H Funahashi, T Nakura, K Taketani, M Hino, Y Otake, HM Shimizu

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 529 ( 1-3 ) page: 190 - 193   2004.8

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    A novel type of cold-neutron interferometer based on a pair of new devices named 'beam splitting etalons (BSE)' has been developed. The parallelism between the two planes in each BSE and the equality of gap thicknesses of the two BSEs ensure the alignment of four independent multilayer mirrors in the interferometer within the precision required by the three-dimensional coherency of the beam. Various arrangements of BSEs enables us to build new types of coherent optical systems for cold neutrons. (C) 2004 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.nima.2004.04.203

    Web of Science

  79. Spectrometer for measurements of phi mesons in nuclear matter produced through 12-GeV p + A reactions Reviewed

    M Sekimoto, J Chiba, H Funahashi, H Hamagaki, M Ieiri, M Ishino, M Kitaguchi, S Mihara, T Miyashita, T Murakami, R Muto, M Naruki, M Nomachi, K Ozawa, F Sakuma, O Sasaki, T Tabaru, KH Tanaka, S Yamada, S Yokkaichi, Y Yoshimura, H En&apos;yo

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Vol. 516 ( 2-3 ) page: 390 - 405   2004.1

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

    A spectrometer was constructed to measure the invariant mass spectra of rho, omega and phi mesons through their e(+)e(-) or K(+)K(-) decays. The KEK experiment E325 was successfully carried out using the new spectrometer, and observed the signature of an in-medium mass modification of the rho and/or omega mesons for the first time. The details of the spectrometer are described. (C) 2003 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.nima.2003.08.168

    Web of Science

  80. Measurement of invariant mass spectra of vector meson decaying in nuclear matter at KEK-PS Reviewed

    R Muto, J Chiba, H En'yo, Y Fukao, H Funahashi, H Hamagaki, M Ieiri, M Ishino, H Kanda, M Kitaguchi, A Mihara, K Miwa, T Miyashita, T Murakami, T Nakura, M Naruki, M Nomachi, K Ozawa, F Sakuma, O Sasaki, M Sekimoto, T Tabaru, KH Tanaka, M Togawa, S Yamada, S Yokkaichi, Y Yoshimura

    INTERSECTIONS OF PARTICLE AND NUCLEAR PHYSICS   Vol. 698   page: 138 - 141   2003

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:AMER INST PHYSICS  

    We measured invariant mass spectra of e(+)e(-) pairs produced in 12-GeV p + A interaction to investigate in-medium mass modification of vector mesons. We observed the excess over the known hadronic sources below the omega meson mass peak. The obtained rho/omega ratio and velocity dependence of excess/omega ratio imply that this excess mainly results from p meson whose miss was modified in nuclear matter.

    Web of Science

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KAKENHI (Grants-in-Aid for Scientific Research) 19

  1. Search for new interaction via neutron-nano-particle scattering

    Grant number:19H01927  2019.4 - 2022.3

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

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    Authorship:Coinvestigator(s)  Grant type:Competitive

  2. Precision measurement of nuclear reactions with polarized neutrons for time-reversal violation search

    Grant number:17H02889  2017.4 - 2020.3

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

    Kitaguchi Masaaki

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\16120000 ( Direct Cost: \12400000 、 Indirect Cost:\3720000 )

    A high performance neutron polarizer with 3He was developed and installed into the beamline BL04 ANNRI in J-PARC. The angular distribution of gamma rays from neutron capture reaction of 139La was clearly observed with the polarized epithermal neutrons. The distributions with polarized and unpolarized neutrons were analyzed with the theory for nuclear reactions. The results tells us that the large enhancement of time-reversal violation in nuclear reaction can be used for search for new physics beyond the standard model with the sensitivity as high as neutron electric dipole moment search.

  3. Study towards next-generation experiment for Supersymmetry using storage of the ultra-cold-neutron with world highest density

    Grant number:26247035  2014.4 - 2017.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    Yamashita Satoru, SHIMIZU Hirohiko, SHIMA Tatsushi, INO Takashi, MISHIMA Kenji, IMAJO Sohei, KATAYAMA Ryo

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    In order to measure the electric dipole moment of neutrons which is one of the major targets of present elementary particle physics, we have achieved (A) the developments of technology for the optical materials and numerical analysis scheme for the transportation and storage of ultra-cold-neutron (UCN), essential for controlling systematic errors, and (B) succeeded in developing UCN acceleration / deceleration device. In particular, we have succeeded; 1) improvement of core of Geant 4 and introducing non-specular reflection model, 2) measurements of the reflective potential and non-specular reflection component for many samples, and development of superior material with the world's highest level of reflection by deuterated-diamond-coating, 3) measuring J-PARC's first UCN storage experiment and accumulation efficiency, 4) develop a system to accelerate and decelerate UCN and controlling the velocity distribution of UCN from existing Doppler shifter, for the first time at J-PARC.

  4. Development for a Next-Generation Experiment to Study Super Symmetry using Accumulation of the Highest Density Ultra-Cold-Neutron

    Grant number:23244047  2011.4 - 2015.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    YAMASHITA Satoru, KITAGUCHI Masaaki, SHIMIZU Hirohiko, SHIMA Tatsushi, IWASHITA Yoshihisa, INO Takashi, MISHIMA Kenji

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    We have achieved major steps to realize the next generation particle physics experiment using an ultra-cold-neutron (UCN), neutrons having very low kinetic energy, in order to study fundamental low of Nature. Following three achievements are highlighted. 1) Developments of materials "UCN reflectors" for the transportation and accumulation of UCN: Especially, a diamond-like-carbon with deuterium satisfies the requirements of the next generation experiment. 2) Development of world brand new device "UCN rebuncher" which controls neutron velocity using the interaction between magnetic field and magnetic moment: We have succeeded to develop the system and verify its performance. 3) Development of Geant4-base simulation software to cope with neutron interactions with a magnetic field and that with surface of materials: The code simulates the transportation and accumulation of UCN with an accuracy of one order higher, which is necessary to design the system of the next generation experiment.

  5. Development of high-performance devices using neutron coherent optics for intense pulsed neutrons

    Grant number:21760050  2009 - 2010

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (B)

    KITAGUCHI Masaaki

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\2990000 ( Direct Cost: \2300000 、 Indirect Cost:\690000 )

    Neutron interferometer has the advantage for fundamental physics experiments, for example, precision measurement of Aharonov-Chaser effect. It is important that high precision measurements using intense pulsed neutrons. We developed optical devices applicable to pulsed neutrons. Clear interference fringes were observed using time-of-flight method at beam line BL05 in J-PARC MLF.
    Neutron spin echo (NSE) spectrometer is one of the techniques for quasi-elastic scattering with the highest energy resolution. We developed high frequency resonance spin flippers for pulsed neutrons. Intensity modulated spin echo signals, which are called as MIEZE signals, were observed according to the time-of-flight at beam line BL05 in J-PARC MLF. We plan to construct the spectrometers for practical use at J-PARC. We are also developing the compact devices for spin echo option for various spectrometers.

  6. Research of the World-Highest Density Source of the Ultra-Cold Neutron for Study of Supersymmetry

    Grant number:20340051  2008 - 2010

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

    YAMASHITA Satoru, KITAGUCHI Masaaki, SHIMIZU Hirohiko, SHIMA Tatsushi, IWASHITA Yoshihisa, YOSHIOKA Tamaki, INO Takashi

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

    An innovative new type of method is designed through this research program to produce world-highest density ultra-cold neutron (UCN), combining pulsed-beam from an accelerator and time-dependent control of the neutron velocity. We have proposed a new experiment using this scheme with J-PARC accelerator LINAC. In order to start R&D for the realization of the scheme, a turbine-type UCN generator is developed. We have formed a new group of researchers to collaborate to realize the experiment.

  7. Development of devices and spectrometer using neutron coherent optics for intense pulsed neutrons

    Grant number:19760046  2007 - 2008

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (B)

    KITAGUCHI Masaaki

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\2210000 ( Direct Cost: \2000000 、 Indirect Cost:\210000 )

  8. 中性子干渉光学の応用によるスピンエコー装置の開発と冷中性子ビームの高度利用

    Grant number:17760055  2005 - 2006

    科学研究費助成事業  若手研究(B)

    北口 雅暁

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\2400000 ( Direct Cost: \2400000 )

    中性子共鳴スピンエコー法では共鳴スピンフリッパーによってスピンアップ・ダウン状態間に波数差をつけ、スピンフリッパー間を飛行する間に位相差を蓄積する。スピンフリッパーに適用する振動磁場の周波数が高い程波数差は大きくなり、装置のエネルギー分解能は向上する。今年度は次のような成果を得た。
    1 高周波化させた共鳴フリッパーを用いて実効1MHzのMIEZE型スピンエコー分光装置を構築した。分解能を示すフーリエ時間は1.7nsecであり、MIEZE型としては世界最高である。
    2 安定的に動作させるためにフリッパー形状を最適化した。実効110kHzから600kHzまでMIEZEを安定して測定できる。現在この装置を用いた物性実験を開始している。
    3 高分解能スピンエコー装置に対するビーム発散補正法を検討した。フリッパー間で蓄積される位相差はビームの入射角によってばらつく。これを補正する磁場形状を提案し、シミュレーションによってその可能性を示した。
    多層膜を用いた冷中性子干渉計は長波長中性子を利用でき、微小相互作用を検出するのに有利である。装置の大型化と、基礎物理への応用をめざし、次のような研究を行った。
    1 ギャップ200μmのビームスプリッティングエタロンを用いた干渉計の光学経路を詳細に調べた。
    2 ビームスプリッティングエタロンを白色中性子に対応させるには、中性子ミラーをスーパーミラー化する必要がある。干渉計構築にはより低磁場で磁化する磁性体ミラーが必要だが、蒸着とイオンビームスパッタ法を用いてスーパーミラーを作成し、中性子反射・磁化特性を調べた。

  9. ソレノイド磁場で実現する新しい手法による中性子寿命問題の解明

    Grant number:21H04475  2021.4 - 2025.3

    科学研究費助成事業  基盤研究(A)

    吉岡 瑞樹, 三島 賢二, 槇田 康博, 北口 雅暁

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    中性子は最も単純な原子核の一つであり、およそ900秒で電子、陽子、反ニュートリノに崩壊する。その崩壊寿命は素粒子標準理論の精密検証において不可欠なパラメータであるが、測定手法間に3.8標準偏差の有意な乖離が見られている。この乖離は「中性子寿命問題」と呼ばれており、未知の現象に起因する可能性が議論されている。我々は茨城県東海村の陽子加速器施設J-PARCの大強度中性子ビームを用いて、既存の手法とは異なる測定方法により中性子寿命を高精度で決定する実験を提案している。本研究は、研究期間内に0.1%の精度で中性子寿命を測定し、中性子寿命問題が未知の現象に起因するか否かに決着をつけることを目的とする。

  10. 中性子干渉計を用いた暗黒宇宙の多角的研究

    Grant number:21H01092  2021.4 - 2024.3

    科学研究費助成事業  基盤研究(B)

    北口 雅暁, 細畠 拓也, 日野 正裕

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    Authorship:Principal investigator 

    Grant amount:\15860000 ( Direct Cost: \12200000 、 Indirect Cost:\3660000 )

    「中性子干渉計」を開発し宇宙進化の鍵である「暗黒エネルギー」を多角的に研究する。質量を持つ物体間の未知の相互作用を詳細に調べるために、質量を持ち電磁気相互作用が小さい中性子を試験粒子として用いる。
    中性子干渉計は相互作用を波動の位相変化として捉えるもので、その位相変化は波長に比例する。長波長パルス中性子を用いることで感度を向上させ系統誤差を抑制する。J-PARCから得られる世界最大強度の中性子ビームと組み合わせることで、暗黒エネルギーに対する探索感度を従来の1桁から2桁向上させる。開発した干渉計を用いて、核力相互作用の精密測定・重力の量子力学的干渉効果、未知短距離力探索などを行う。

  11. Measurement of the neutron lifetime using pulsed neutron beams at J-PARC : Resolving the neutron lifetime puzzle

    Grant number:19H00690  2019.4 - 2022.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

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    Authorship:Coinvestigator(s) 

  12. Neutron lifetime measurement using pulsed neutron beam at J-PARC

    Grant number:16H02194  2016.4 - 2019.3

    Mishima Kenji

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    The neutron lifetime is a very important parameter to understand nucleosynthesis in the early universe or the standard model of the elementary particles. The neutron lifetime was determined by the beam method, which counts the number of neutrons and the number of decays per unit time, or storaging method, which measures the decay time of storaged ultra cold neutrons.
    The results of the two types of methods gave a discrepancy of 8.4 seconds (4σ), and the solution of this problem is an urgent issue. In order to solve this problem, we have developed a new method for precise measurement of the neutron lifetime. The experiment was performed using J-PARC pulsed neutrons with a gas detector to count the decay electron with mixed 3He to measure the neutron flux. As the results, the neutron lifetime was obtained as 896±10 (statistical error) +14/-10 (strain error) [s] by detecting neutron decay electrons .

  13. Search for neutron electric dipole moment with crystal diffraction

    Grant number:16K13804  2016.4 - 2018.3

    Kitaguchi Masaaki

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    Authorship:Principal investigator 

    Grant amount:\3120000 ( Direct Cost: \2400000 、 Indirect Cost:\720000 )

    Neutron electric dipole moment (EDM) is an important probe to search for new physics beyond standard model. Search for EDM with crystal diffraction is advantageous according to the extremely strong effective electric field inside the crystal.
    We observed Pendellosung interference fringes using pulsed cold neutrons in J-PARC for the first time. This means the establishment of the fundamental technique to search for the neutron EDM with crystal diffraction. We are continuing the development of the experimental setup with polarized neutron beamline to measure the internal electric field of the crystals. The measurement of the electric field in non-centrosymmetric crystal has been started.

  14. An experimental test of the inverse-square law of the gravitation using low energy neutron scattering

    Grant number:25800152  2013.4 - 2015.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (B)

    YOSHIOKA Tamaki, KITAGUCHI Masaaki, MISHIMA Kenji, SHIMIZU Hirohiko, SHIMA Tatsushi, INO Takashi

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    We have successfully selected the candidate material for the target gas chamber and optimized the experimental setup using newly developed simulation code. Based on the result, all experimental apparatus have been constructed and installed to the beam line. We unfortunately could not perform data taking due to J-PARC regulation. The experiment will be carried out within the next fiscal year.

  15. Development of fabrication technique for a two-dimensional neutron focusing mirror and the performance test

    Grant number:23360428  2011.4 - 2014.3

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

    HINO Masahiro, KITAGUCHI Masaaki, KAWABATA Yuji, SUGIYAMA Masaaki

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    We have succeeded in fabricating large-scale self-supporting high-m neutron supermirror and very small d-spacing multilayer sheets using ion beam sputtering (IBS) instrument at KURRI. Before this study, the maximum deposition size at the KUR-IBS was limited to 200 mm in diameter and it was not enough large to fabricate neutron guide tube. In this study, we have developed new fabrication techniques and enlarged the maximum size to 460 mm in diameter. This result was a significant contribution to build a new beam line at BL06 at J-PARC and improve SANS monochromators at KURRI. The supermirror sheet was peeled off by using replica technique and the reflectivity was almost same with that of supermirror fabricated by usual process. The sheet is self-supporting and one of ideal focusing device without support material. However, the shape control is still difficult. We studied the scope of application and so far another technique is more promising in case of low-Qc(m<4) with small curvature.

  16. Development of very-cold-neutron interferometer components toward search for exotic short-range force

    Grant number:21340048  2009 - 2011

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

    SANUKI Tomoyuki, KITAGUCHI Masaaki

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    We have developed some indispensable components for realization of very-cold neutron interferometer, which would be a tool to search for exotic short-range force. Those components were aligned precisely, using a white light fringe pattern.

  17. 中性子スピン干渉を利用した小角散乱分光法の開発

    Grant number:21656237  2009 - 2010

    科学研究費助成事業  挑戦的萌芽研究

    日野 正裕, 北口 雅暁

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    本研究では中性子スピンの位相を精密に制御することで、検出器の位置分解能よりも高分解能な小角散乱分光法(SANS)を提案し、実験で評価することが目的である。その実現にはJST先端計測分析技術・機器開発事業の支援を受けて、世界で初めて開発に成功した電磁石を用いた共鳴スピンフリッパーコイル(RSF)による高分解能MIEZE型スピンエコー分光器の基本部品と技術を応用することでめざした。実験は日本原子力研究開発機構C3-1-2-2ポート(MINE1)において行った。RSFと2次元検出器を傾けた状態でMIEZEシグナルの観測に成功した。しかしRSFの電磁石の静磁場の均一度やもれ磁場の干渉により、振動磁場を斜めに傾ける方法では高分解能化が難しいことが分かった。また振動磁場コイルを斜めにする手法は異方性のある試料に関しては、少なくとも90度回転させて、0と90度の2回は測定することが必要であるが、このことは、磁場をかけることが有効な試料の道も閉ざす。これはMIEZE型では試料の後方には検出器しか必要無いため、磁場環境からもフリーになり磁気散乱の測定も容易であるメリットを活かせなくなる。この様な実験検討から、電磁石RSFのメリットを活かし、高分解能な小角散乱測定を行うには振動磁場コイルを斜めに配置するよりも、ビームに対して垂直にし、集光デバイスを用いてビームの軌跡をより精密に制御する方が有効なことが明らかになった。そこで今回は新たにフレキシブルな高性能な中性子スーパーミラーシートの開発に成功して(特許出願)、集光デバイスを安価に製作できる可能性を示した。また実機でMIEZE-SANSの検討のために、安価な磁気ミラーホルダーの開発、及びそれを用いた長尺(L=60cm)で3.5Qcの透過型偏極スーパーミラーの開発に成功した。

  18. Fundamental Physics using Neutron Optics

    Grant number:19GS0210  2007 - 2011

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Creative Scientific Research

    SHIMIZU Hirohiko, INO Takashi, MUTO Suguru

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    Cold neutron beam line BL05 was constructed at J-PARC. Various experiments including precision measurement of neutron lifetime was started with the high quality beam, which is provided by using our neutron optical devices. Developments of the devices, for example, space-time focusing of ultra-cold neutrons, enables us to perform extremely high precision measurement for physics beyond the standard model. For material science, we also developed some new neutron spectrometers including focusing VCN-SANS and resonance NSE.

  19. Development of polarizing neutron supermirror for lower external magnetic field and estimation of its magnetic property

    Grant number:19560841  2007 - 2008

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    MASAHIRO Hino, KITAGUCHI Masaaki

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    Authorship:Coinvestigator(s)  Grant type:Competitive

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Teaching Experience (On-campus) 1

  1. 物理学基礎II

    2017

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    電磁気学の基礎を概観する。

Teaching Experience (Off-campus) 7

  1. 高エネルギー物理学(大学院)

    名古屋大学理学研究科)

  2. 素粒子宇宙物理研究のための実験観測技術入門

    名古屋大学理学研究科)

  3. 物理学演習(2年)

    名古屋大学理学部)

  4. 物理学実験(大学院)

    京都大学工学研究科)

  5. 物理学実験(3年)

    名古屋大学理学部)

  6. 物理学実験(1年)

    名古屋大学理学部)

  7. 先端物理学基礎(2年)

    名古屋大学理学部)

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Social Contribution 6

  1. School visit

    Role(s):Lecturer

    Ise High School  2018.10

  2. School visit

    Role(s):Lecturer

    Ise High School  2017.10

  3. School visit

    Role(s):Lecturer

    Ise High School  2016.9

  4. School visit

    Role(s):Lecturer

    Ise High School  2015.9

  5. KMI public lecture

    Role(s):Presenter

    Kobayashi Maskawa Institute, Nagoya University  2015.4

  6. Kagaku-zammai

    Role(s):Demonstrator

    Aichi Pref.  2013.12

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