Faculty Profiles - SHIMIZU Hirohiko

Papers - SHIMIZU Hirohiko

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Neutron lifetime measurement at J-PARC/BL05 : Performance evaluation of large acceptance neutron optics

Yokohashi Mami, Hirota Katsuya, Shimizu Hirohiko, Kitaguchi Masaaki, Kitahara Ryunosuke, Iwashita Yoshihisa, Yoshioka Tamaki, Otono Hidetoshi, Yamada Takahito, Yamashita Satoru, Seki Yoshichika, Oide Hideyuki, Mishima Kenji, Taketani Kaoru, Ino Takashi

Meeting Abstracts of the Physical Society of Japan Vol. 72.1 ( 0 ) page： 63 - 63 2017

Neutron lifetime measurement at J-PARC/BL05: Present status and results

Mishima Kenji, Hirota Katsuya, Ieki Sei, Ino Takashi, Iwashita Yoshihisa, Kitaguchi Masaaki, Kitahara Ryunosuke, Koga Jun, Morishita Aya, Nagakura Naoki, Oide Hideyuki, Otono Hidetoshi, Seki Yoshichika, Sekiba Daiichiro, Shima Tatsushi, Shimizu Hirohiko M., Sumi Naoyuki, Sumino Hirochika, Taketani Kaoru, Tomita Tatsuhiko, Yamada Takahito, Yamashita Satoru, Yokohashi Mami, Yoshioka Tamaki

Meeting Abstracts of the Physical Society of Japan Vol. 72.2 ( 0 ) page： 75 - 75 2017

Measurement of the cross section of neutron resonance in 139La

Takeshita Hayato, Shimizu Hirohiko, Kitaguchi Masaaki, Hirota Katsuya, Ichikawa Go, Okudaira Takuya, Okada Anju, Goto Fumiya, Nagamoto Kosuke, Yamamoto Tomoki, Takada Shusuke, Yoshioka Tamaki, Ino Takashi, Asahi Koichiro, Momose Takamasa, Iwata Takahiri, Sakai Kenji, Hino Masahiri, Shima Tatsushi, Yamagata Yutaka, Kimura Atsushi

Meeting Abstracts of the Physical Society of Japan Vol. 72.1 ( 0 ) page： 360 - 360 2017

Development of high spatial resolution cold/ultracold neutron detector using fine-grained nuclear emulsion Open Access

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

Proceedings of Science Vol. 2017-January 2017

The MTV experiment: searching for T-violation in polarized Li-8 at TRIUMF

Murata, J; Baba, H; Behr, JA; Goto, F; Inaba, S; Kawamura, H; Kitaguchi, M; Levy, CDP; 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 ( 1 ) 2016.8

Publisher：Hyperfine Interactions

The MTV experiment (Mott Polarimetry for T-Violation Experiment) is running at TRIUMF, to search for a large T-violating transverse electron-polarization in polarized 8Li β-decay. We aim at reaching precision of 10−4 for the R-correlation, which is defined as a T-violating triple vector correlation in the β-decay rate function. A Mott polarimeter system using a CDC (Cylindrical Drift Chamber) is used to measure the left-right scattering asymmetry in the Mott scattering from a thin metal foil. In the present study, we aim to discuss systematic effects in Mott polarimetry using the CDC.

DOI： 10.1007/s10751-016-1336-z

Web of Science

Scopus

Neutron-antineutron oscillations: Theoretical status and experimental prospects Open Access

Phillips, DG; Snow, WM; Babul, K; Banerjee, S; Baxter, DV; Berezhiani, Z; Bergevin, M; Bhattacharya, S; Brooijmans, G; Castellanos, L; Chen, MC; Coppola, CE; Cowsik, R; Crabtree, JA; Das, P; Dees, EB; Dolgov, A; Ferguson, PD; Frost, M; Gabrie, T; Gal, A; Gallmeier, F; Ganezer, K; Golubeva, E; Greene, G; Hartfiel, B; Hawari, A; Heilbronn, L; Johnson, C; Kamyshkov, Y; Kerbikov, B; Kitaguchi, M; Kopeliovich, BZ; Kopeliovich, VB; Kuzmin, VA; Liu, CY; McGaughey, P; Mocko, M; Mohapatra, R; Mokhov, N; Muhrer, G; Mumm, HP; Okun, L; Pattie, RW; Quigg, C; Ramberg, E; Ray, A; Roy, A; Ruggles, A; Sarkar, U; Saunders, A; Serebrov, AP; Shimizu, HM; Shrock, R; Sikdar, AK; Sjue, S; Striganov, S; Townsend, LW; Tschirhart, R; Vainshtein, A; Van Kooten, R; Wang, Z; Young, AR

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

Publisher：Physics Reports

The observation of neutrons turning into antineutrons would constitute a discovery of fundamental importance for particle physics and cosmology. Observing the n-n 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 nextgeneration 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.

DOI： 10.1016/j.physrep.2015.11.001

Web of Science

Scopus

Pulsed ultra-cold neutron production using a Doppler shifter at J-PARC Open Access

Imajo, S; Mishima, K; Kitaguchi, M; Iwashita, Y; Yamada, NL; Hino, M; Oda, T; Ino, T; Shimizu, HM; Yamashita, S; Katayama, R

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

Publisher：Progress of Theoretical and Experimental Physics

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 m s-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 m s-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 × 102 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

Open Access

Web of Science

Scopus

Performance test of the Ultracold Neutron Rebuncher

Imajo Sohei, Iwashita Yoshihisa, Mishima Kenji, Kitaguchi Masaaki, Shimizu Hirohiko M., Ino Takashi, Yamashita Satoru, NOP collaboration

Meeting Abstracts of the Physical Society of Japan Vol. 71.2 ( 0 ) page： 64 - 64 2016

Possibility of crystal and experimental system for measurement of inner electric field

Nakaji Masaya, Itoh Shigeyasu, Kitaguchi Masaaki, Shimizu Hirohiko

Meeting Abstracts of the Physical Society of Japan Vol. 71.2 ( 0 ) page： 277 - 277 2016

The design of the beam line of the Nagoya University Accelerator-driven Neutron Source

Ito Ikuya, Shimizu Hirohiko, Kitaguchi Masaaki, Hirota Katsuya, Ichikawa Go, Yoshiaki Kiyanagi, Tsuchida Kazuki, Uritani Akira, Yoshihashi Sachiko, Watanabe Kenichi, Yamazaki Jun, Miwata Haruhiko, Yamagata Yutaka, Iwashita Yoshihisa

Meeting Abstracts of the Physical Society of Japan Vol. 71.2 ( 0 ) page： 295 - 295 2016

Neutron lifetime measurement at J-PARC/BL05 : Development of the detector

Tomita T., Sumi N., Morishita A., Otono H., Yoshioka T., Kitahara R., Iwashita Y., Yamada T., Yamashita S., Hirota K., Shimizu H., Yokohashi M., Kitaguchi M., Oide H., Shima T., Mishima K., Taketani K., Ino T.

Meeting Abstracts of the Physical Society of Japan Vol. 71.2 ( 0 ) page： 59 - 59 2016

Neutron lifetime measurement at J-PARC/BL05: Systematic uncertainties and result

Yamada Takahito, Ieki Sei, Nagakura Naoki, Yamashita Satoru, Sumino Hirochika, Shimizu Hirohiko M., Hirota Katsuya, Yokohashi Mami, Kitaguchi Masaaki, Yoshioka Tamaki, Otono Hidetoshi, Tomita Tatsuhiko, Sumi Naoyuki, Morishita Aya, Iwashita Yoshihisa, Kitahara Ryunosuke, Oide Hideyuki, Shima Tatsushi, Mishima Kenji, Ino Takashi, Taketani Kaoru, Seki Yoshichika

Meeting Abstracts of the Physical Society of Japan Vol. 71.2 ( 0 ) page： 61 - 61 2016

Measurement of 14N(n,p)14C cross section using cold neutron beam at J-PARC/MLF/BL05

Kitahara Ryunosuke, Iwashita Yoshihisa, Shimizu Hirohiko, Hirota Katsuya, Yokohashi Mami, Kitaguchi Masaaki, Yoshioka Tamaki, Otono Hidetoshi, Morishita Aya, Sumi Naoyuki, Tomita Tatsuhiko, Yamashita Toru, Nagakura Naoki, Ieki Sei, Yamada Takahito, Shima Tatsushi, Seki Yoshichika, Oide Hideyuki, Mishima Kenji, Taketani Kaoru, Ino Takashi

Meeting Abstracts of the Physical Society of Japan Vol. 71.2 ( 0 ) page： 174 - 174 2016

Measurement of the inner electric field of Bi12GeO20for the measurement of EDM of a neutron

Itoh Shigeyasu, Nakaji Masaya, Kitaguchi Masaaki, Shimizu Hirohiko

Meeting Abstracts of the Physical Society of Japan Vol. 71.2 ( 0 ) page： 276 - 276 2016

Neutron lifetime measurement at J-PARC/BL05 : Development of large acceptance neutron optics

Meeting Abstracts of the Physical Society of Japan Vol. 71.2 ( 0 ) page： 79 - 79 2016

20pAP-8 Neutron lifetime measurement at J-PARC/BL05 : Neutron optics for large beam acceptance

Meeting Abstracts of the Physical Society of Japan Vol. 71.1 ( 0 ) page： 585 2016

20pAP-7 Neutron lifetime measurement at J-PARC/BL05 : Development of spin flip chopper

Kitahara Ryunosuke, Iwashita Yoshihisa, Yokohashi Mami, Hirota Katsuya, Shimizu Hirohiko, Kitaguchi Masaaki, Yoshioka Tamaki, Otono Hidetoshi, Yamada Takahito, Yamashita Satoru, Seki Yoshichika, Oide Hidetoshi, Mishima Kenji, Taketani Kaoru, Ino Takashi

Meeting Abstracts of the Physical Society of Japan Vol. 71.1 ( 0 ) page： 584 2016

20pAH-9 Neutron lifetime measurement at J-PARC/BL05 : Data analysis 2014/2015

Sumi N., Tanaka G., Tomita T., Morishita A., Yoshioka T., Otono H., Kitahara R., Iwashita Y., Yamada T., Ieki S., Nagakura N., Yokoyama H., Yamashita S., Sumino H., Sakakibara R., Sugino T., Yokohashi M., Hirota K., Shimizu H., Kitaguchi M., Oide H., Seki Y., Shima T., Mishima K., Taketani K., Ino T.

Meeting Abstracts of the Physical Society of Japan Vol. 71.1 ( 0 ) page： 108 2016

20pAH-8 Neutron lifetime measurement at J-PARC/BL05 : Evaluation of efficiency for a beta-decay event by simulation

Nagakura Naoki, Yamada Takahito, Yokoyama Harumichi, Ieki Sei, Yamashita Satoru, Seki Yoshichika, Sumino Hirochika, Shimizu Hirohiko M., Hirota Katsuya, Sakakibara Risa, Sugino Tomoaki, Yokohashi Mami, Kitaguchi Masaaki, Yoshioka Tamaki, Otono Hidetoshi, Tanaka Genki, Sumi Naoyuki, Tomita Tatsuhiko, Morishita Aya, Iwashita Yoshihisa, Kitahara Ryunosuke, Oide Hideyuki, Shima Tatsushi, Mishima Kenji, Ino Takashi, Taketani Kaoru

Meeting Abstracts of the Physical Society of Japan Vol. 71.1 ( 0 ) page： 107 2016

20pAH-12 Development of ultracold neutron rebuncher with a neutron Doppler shifter at J-PARC MLF

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

Meeting Abstracts of the Physical Society of Japan Vol. 71.1 ( 0 ) page： 110 2016

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Papers - SHIMIZU Hirohiko