Faculty Profiles - SHIMIZU Hirohiko

Papers - SHIMIZU Hirohiko

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The improvement of the ultracold neutrons rebuncher for nEDM experiments at J-PARC

Imajo S., Iwashita Y., Shimizu H.M., Kitaguchi M., Yoshioka T., Arimoto Y., Seki Y., NOP collaboration

Meeting Abstracts of the Physical Society of Japan Vol. 68.2.1 ( 0 ) page： 28 2013

27pHC-13 中性子を用いた重力法則の検証(27pHC 実験核物理領域,素粒子実験領域,ビーム物理領域,理論核物理領域合同 J-PARCと原子核素粒子実験,実験核物理領域)

松本悟, 吉岡瑞樹, 清水裕彦, 嶋達志, 猪野隆, 北口雅暁, 三島賢二

日本物理学会講演概要集 Vol. 68.1.1 ( 0 ) page： 96 2013

27aRF-2 The improvement of Dopplershifter in J-PARC/MLF to increase the ultracold neutron flux-

Imajo S., Iwashita Y., Shimizu H. M., Yoshioka T., Kitaguchi M., Mishima K., Ino T., Arimoto Y., Seki Y., NOP collaboration

Meeting Abstracts of the Physical Society of Japan Vol. 68.1.1 ( 0 ) page： 29 2013

26aXZB-2 Progress of Polarisation Analysis Neutron Spectrometer Project in J-PARC

Ohoyama K., Yokoo T., Itoh S., Suzuki J., Sato T. J., Iwasa K., Kira H., Sakaguchi Y., Oku T., Ino T., Hiraka H., Matsuura M., Fujita M., Tomiyasu K., Kimura H., Suzuki J., Shimizu H. M., Arima T., Takeda M., Kaneko K., Hino M., Muto S., Nojiri H., Lee C. H., Park J. G., Choi S.

Meeting Abstracts of the Physical Society of Japan Vol. 68.1.4 ( 0 ) page： 1012 2013

26aXZB-2 Progress of Polarisation Analysis Neutron Spectrometer Project in J-PARC

Meeting Abstracts of the Physical Society of Japan Vol. 68.1.1 ( 0 ) page： 146 2013

Fundamental physics with slow neutrons Open Access

Shimizu H.

Proceedings of Science Vol. 2013-December 2013

Publisher：Proceedings of Science

A neutron beamline for the study of the 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 preparation for the study of T-violation using neutrons is in progress. Present status of the beamline and present activities are reported.

DOI： 10.22323/1.208.0010

Open Access

Scopus

Magnetic shield design of in-situ SEOP polarized <sup>3</sup>He neutron spin filter system Open Access

Kira H., Sakaguchi Y., Suzuki J., Oku T., Nakamura M., Arai M., Kakurai K., Endo Y., Arimoto Y., Ino T., Shimizu H.M., Kamiyama T., Ohoyama K., Hiraka H., Tsutsumi K., Yamada K., Chang L.J.

Physics Procedia Vol. 42 page： 200 - 205 2013

Publisher：Physics Procedia

A polarized 3He neutron spin filter requires a suitably homogeneous magnetic environment to avoid depolarization of 3He nuclear spin. In the present study, we discussed the required performance of the magnetic shield for an in-situ spin exchange optical pumping neutron spin filter system and designed a magnetic shield with T1mag > 100 h under a magnetic field of 3.5 mT perpendicular to the guide field. We then constructed the magnetic shield and confirmed its performance. Finally, we succeeded in developing a magnetic shield for a polarized 3He neutron spin filter system for J-PARC. © 2013 The Authors.

DOI： 10.1016/j.phpro.2013.03.195

Open Access

Web of Science

Scopus

Rebunching low energy neutrons by magnetic acceleration and deceleration Open Access

Iwashita Y., Imajo S., Kitaguchi M., Arimoto Y., Shimizu H.M., Yoshioka T., Seki Y., Geltenbort P.

IPAC 2012 - International Particle Accelerator Conference 2012 page： 2766 - 2768 2012.12

Publisher：IPAC 2012 - International Particle Accelerator Conference 2012

Acceleration control for neutrons was demonstrated. Ultra cold neutrons (UCN) -neutrons with energies less than 300 neV - can be accelerated or decelerated by means ofstatic magnetic and RF fields. Neutrons have a magnetic dipole moment, and hence theirkinetic energies vary depending on their spin in magnetic fields. Their kinetic energiesare restored when they leave the magnetic field area if their spin did not flip. A spinflip can be triggered by applying an RF field whose frequency coincides with the spinprecession frequency of a neutron in this magnetic field. This allows to tune the kineticenergy of neutrons. This method can be used to rebunch a pulsed beam of neutrons to astorage bottle that can store UCN. By opening and closing the storage bottle synchronouslywith the rebuncher, high UCN densities can be achieved for precision measurements ofneutron properties such as the Electric Dipole Moment. Copyright © 2012 by IEEE.

Open Access

Scopus

Demonstration of focusing by a neutron accelerator

Arimoto, Y; Gertenbort, P; Imajo, S; Iwashita, Y; Kitaguchi, M; Seki, Y; Shimizu, HM; Yoshioka, T

PHYSICAL REVIEW A Vol. 86 ( 2 ) 2012.8

Publisher：Physical Review A - Atomic, Molecular, and Optical Physics

Space-time focusing was demonstrated by a neutron accelerator. Test experiments were performed by using very slow neutrons at High-Flux Reactor at Institut Laue-Langevin. Focusing of neutrons at the detector position through the accelerator was observed. Focusing neutrons enables us to transport the neutrons while maintaining density from source to experimental position. This will be a powerful technique for measurement of the permanent electric dipole moment of neutrons, which require a high density of neutrons. © 2012 American Physical Society.

DOI： 10.1103/PhysRevA.86.023843

Web of Science

Scopus

Variable permanent magnet multipoles

Iwashita Y., Yamada M., Ushijima S., Fuwa Y., Nasu Y., Tongu H., Masuzawa M., Shimizu H.

IEEE Transactions on Applied Superconductivity Vol. 22 ( 3 ) 2012.6

Publisher：IEEE Transactions on Applied Superconductivity

Permanent magnet quadrupoles (PMQ) and sextupoles (PMSx) have been fabricated and tested. Their effective strengths are variable. The PMQ has been developed as a final focus magnet for a linear collider. There is enough space to put Gluckstern's 5-ring singlet structures in each incoming beam line. The magnetic center offsets and higher harmonic components can be adjusted by adjusting the positions of the magnet pieces with screws on holders. The measured integrated gradient can be reduced down to less than 1% of the maximum strength. The PMSx has been developed to focus pulsed cold neutrons for a small angle neutron scattering (SANS) experiment. The strength is modulated by a so called double ring structure, where the inner ring is fixed and the outer ring is rotated. A torque canceller can reduce the torque to rotate the outer ring by one third of its original magnitude. The focal length of the fabricated triplet lens is less than 50 cm for Very Cold Neutrons (VCN). It is demonstrated that VCN-SANS can shorten a SANS beamline, which usually has a few tens of meters, down to 2 ∼ 3 meters. © 2002-2011 IEEE.

DOI： 10.1109/TASC.2012.2185471

Web of Science

Scopus

Demonstration of optical thickness measurement using multilayer cold neutron interferometer

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

5TH EUROPEAN CONFERENCE ON NEUTRON SCATTERING Vol. 340 2012

Publisher：Journal of Physics: Conference Series

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-μm-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

Web of Science

Scopus

14aSG-3 低エネルギー中性子小角散乱を用いた重力法則の検証(14aSG 新粒子・新物理の探索,素粒子実験領域)

松本悟, 吉岡瑞樹, 清水裕彦, 嶋達志, 猪野隆

日本物理学会講演概要集 Vol. 67.2.1 ( 0 ) page： 25 2012

11aSG-7 Development of a ultracold neutrons rebuncher in J-PARC/MLF

Imajo S., Iwashita Y., Shimizu H. M., Yoshioka T., Kitaguchi M., Arimoto Y., Seki Y., NOP collaboration

Meeting Abstracts of the Physical Society of Japan Vol. 67.2.1 ( 0 ) page： 13 2012

11aSG-6 Estimation of nonspecular reflection of ultracold neutrons from surface roughness

Seki Yoshichika, Kitaguchi Masaaki, Yoshioka Tamaki, Shimizu Hirohiko, Yamada Norifumi, NOP Collaboration

Meeting Abstracts of the Physical Society of Japan Vol. 67.2.1 ( 0 ) page： 13 2012

11aSG-5 Development of neutron mirror with diamond-like carbon film

Sakurai D., Shimizu H., Ino T., Yoshioka T., Kitaguchi M., Mishima K., Kakusho N., the NOP Collaboration

Meeting Abstracts of the Physical Society of Japan Vol. 67.2.1 ( 0 ) page： 13 2012

24aFA-7 Demonstration of transport system of high-density ultra-cold neutrons for nEDM measurement

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

Meeting Abstracts of the Physical Society of Japan Vol. 67.1.1 ( 0 ) page： 24 2012

27aXC-10 ∧ photoproduction detected with electromagnetic calorimeter FOREST

Tsuchikawa Y., Fujimura H., Hashimoto R., Ishikawa T., Masumoto S., Miyabe M., Nakamura A., Shimizu H, Suzuki K., Yamazaki H.

Meeting Abstracts of the Physical Society of Japan Vol. 67.1.1 ( 0 ) page： 112 2012

25pCL-5 Limiting factors to attainable ^3He-plarization in spin-exchange optical pumping of polarized ^3He neutron spin filters

Sakaguchi Y., Kira H., Oku T., Shinohara J., Suzuki J., Sakai K., Nakamura M., Suzuya K., Aizawa K., Arai M., Takeda N, Endoh Y., Arimoto Y., Ino T., Shimizu M., Kamiyama T., Ohoyama K., Hiraka H., Yamada K., Chang L. J., Ohara K., Kakurai K.

Meeting Abstracts of the Physical Society of Japan Vol. 67.1.4 ( 0 ) page： 1006 2012

25pCL-14 Progress of Polarisation Analysis Neutron Spectrometer Project in J-PARC

Ohoyama K., Iwasa K., Yokoo Y., Itoh S., Tomiyasu K., Matusura M., Hiraka H., Fujita M., Kimura H., Sato T., Sato T.J., Arima T., Ino T., Kira H., Sakaguchi Y., Oku T., Arimoto Y., Suzuki J., Shimizu H.M., Takeda M., Kaneko K., Hino M., Muto G., Nojiri H.

Meeting Abstracts of the Physical Society of Japan Vol. 67.1.4 ( 0 ) page： 1008 2012

Development of polarized Xe gas target for neutron experiment at J-PARC

Sakai K., Oku T., Shinohara T., Kira H., Ooi M., Maekawa F., Kakurai K., Ino T., Arimoto Y., Shimizu H. M., Sakaguchi Y., Suzuki J., Ohoyama K., Chang L. J.

5TH EUROPEAN CONFERENCE ON NEUTRON SCATTERING Vol. 340 2012

Publisher：Journal of Physics: Conference Series

At the Materials and Life science experimental Facility (MLF) in J-PARC, an experiment of detecting a neutron polarizing ability caused by a neutron-nuclear spin correlation at a resonant peak of 129Xe is planned. We evaluated measurable quantities based on a neutron optical theorem, developed a polarized Xe gas system, and carried out a feasibility test of our apparatus.

DOI： 10.1088/1742-6596/340/1/012037

Web of Science

Scopus

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Papers - SHIMIZU Hirohiko