研究者詳細 - 清水　裕彦

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 42 巻頁： 200 - 205 2013年

出版者・発行元：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 頁： 2766 - 2768 2012年12月

出版者・発行元：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 86 巻 ( 2 ) 2012年8月

出版者・発行元：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 22 巻 ( 3 ) 2012年6月

出版者・発行元：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 340 巻 2012年

出版者・発行元：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 67.2.1 巻 ( 0 ) 頁： 25 2012年

11aSG-7 J-PARC MLFにおける超冷中性子(UCN)Rebuncherの開発(11aSG 中性子・ポジトロニウム,素粒子実験領域)

今城想平, 岩下芳久, 清水裕彦, 吉岡瑞樹, 北口雅暁, 有本靖, 関義親

日本物理学会講演概要集 67.2.1 巻 ( 0 ) 頁： 13 2012年

11aSG-6 超冷中性子用ミラー基板の表面ラフネスの評価(11aSG 中性子・ポジトロニウム,素粒子実験領域)

関義親, 北口雅暁, 古岡瑞樹, 清水裕彦, 山田悟史

日本物理学会講演概要集 67.2.1 巻 ( 0 ) 頁： 13 2012年

11aSG-5 ダイヤモンドライクカーボン薄膜による中性子ミラーの開発(11aSG 中性子・ポジトロニウム,素粒子実験領域)

櫻井大, 清水裕彦, 猪野隆, 吉岡瑞樹, 北口雅暁, 三島賢二, 覚正信徳

日本物理学会講演概要集 67.2.1 巻 ( 0 ) 頁： 13 2012年

24aFA-7 中性子電気双極子モーメント測定実験のための高密度超冷中性子輸送法の開発(24aFA ミュオニウム・中性子・ポジトロニウム,素粒子実験領域)

北口雅暁, 吉岡瑞樹, 清水裕彦, 有本靖, 竹谷薫, 猪野隆, 武藤豪, 岩下芳久, 今城想平, 三島賢二, 神谷好郎, 山下了, 関義親, 旭耕一郎, 吉見彰洋, 嶋達志

日本物理学会講演概要集 67.1.1 巻 ( 0 ) 頁： 24 2012年

25pCL-5 SEOP式偏極^3He中性子スピンフィルターにおける到達^3He偏極率制限因子についての考察(25pCL X線・粒子線(中性子),領域10(誘電体,格子欠陥,X線・粒子線,フォノン))

坂口佳史, 吉良弘, 奥降之, 篠原武尚, 鈴木淳市, 酒井健二, 中村充孝, 鈴谷賢太郎, 相澤一也, 新井正敏, 武田全康, 遠藤康夫, 有本靖, 猪野隆, 清水裕彦, 神山崇, 大山研司, 平賀晴弘, 山田和芳, 張烈錚, 尾原幸治, 加倉井和久

日本物理学会講演概要集 67.1.4 巻 ( 0 ) 頁： 1006 2012年

25pCL-14 J-PARC偏極度解析中性子分光器計画の進展(25pCL X線・粒子線(中性子),領域10(誘電体,格子欠陥,X線・粒子線,フォノン))

大山研司, 岩佐和晃, 横尾哲也, 伊藤晋一, 富安啓輔, 松浦直人, 平賀晴弘, 藤田全基, 木村宏之, 佐藤豊人, 佐藤卓, 有馬孝尚, 猪野隆, 吉良弘, 坂口佳史, 奥隆之, 有本靖, 鈴木淳市, 清水裕彦, 武田全康, 金子耕士, 日野正裕, 武藤豪, 野尻浩之

日本物理学会講演概要集 67.1.4 巻 ( 0 ) 頁： 1008 2012年

27aXC-10 電磁カロリメータFORESTを用いた∧光生成反応の研究(27aXC 実験核物理領域,理論核物理領域合同エキゾチック系・ハドロン構造(合同),実験核物理領域)

土川雄介, 藤村寿子, 橋本亮, 石川貴嗣, 桝本新一, 宮部学, 中村聡彦, 清水肇, 鈴木耕拓, 山崎寛仁

日本物理学会講演概要集 67.1.1 巻 ( 0 ) 頁： 112 2012年

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 340 巻 2012年

出版者・発行元：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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