研究者詳細 - 北口　雅暁

論文 - 北口　雅暁

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Neutron resonance spin echo and MIEZE spectrometer development project in Japan 査読有り

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 385-86 巻頁： 1122 - 1124 2006年11月

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

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 < Q < 3.5 (I/A), 20 < t < 1300 (ps); (2) high intensity NRSE: 0.005 < Q < 3.1 (I/A), I < t < 170 (ns); (3) high resolution NRSE: 0.003 < Q < 1.2 (I/A), 0.03 < t < 1 (ps). (c) 2006 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physb.2006.05.387

Web of Science

Moire fringes of cold neutron with large divergence angle 査読有り

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

PHYSICA B-CONDENSED MATTER 385-86 巻頁： 1222 - 1224 2006年11月

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

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

Development of neutron resonance spin flipper for high resolution NRSE spectrometer 査読有り

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

PHYSICA B-CONDENSED MATTER 385-86 巻頁： 1128 - 1130 2006年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Development of large-m polarizing neutron supermirror fabricated by using ion beam sputtering instrument at KURRI 査読有り

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

PHYSICA B-CONDENSED MATTER 385-86 巻頁： 1187 - 1189 2006年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

First observation of phi-meson mass modification in nuclear medium 査読有り

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 774 巻頁： 723 - 726 2006年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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) < 1.25) in the copper data. On the other hand, in the higher beta gamma region (beta gamma(phi) < 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

Web of Science

Nuclear mass number dependence of inclusive production of omega and phi mesons in 12 GeV p plus A collisions 査読有り

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 74 巻 ( 2 ) 2006年8月

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

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 < y < 1.7 and p(T)< 0.75 GeV/c.

DOI： 10.1103/PhysRevC.74.025201

Web of Science

Observation of MIEZE signal with an effective frequency of 1 MHz 査読有り

H. Hayashida, M. Kitaguchi, M. Hino, Y. Kawabata, T. Ebisawa

KURRI Progress Report 頁： 172 2006年4月

Study of new layer structure for large-m polarizing neutron supermirror 査読有り

M. Hino, M. Kitaguchi, H. Hayashida, Y. Kawabata, T. Ebisawa, R. Maruyama, T. Kume, S. Tasaki

KURRI Progress Report 頁： 171 2006年4月

Experimental signature of medium modifications for rho and omega mesons in the 12 GeV p+A reactions 査読有り

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 96 巻 ( 9 ) 2006年3月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Web of Science

Development of neutron multiplayer mirrors on beam splitting etalons for pulsed neutrons 査読有り

H. Funahashi, M. Kitaguchi, M. Hino, Y. Seki, K. Taketani

KURRI Progress Report 頁： 173- 2006年

KEK-PS E325 Collaboration 査読有り

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 774 巻 ( 1-4 ) 頁： 942- 2006年

Experimental Study of in-medium meson modification at the KEK 12 GeV PS(Hadrons at finite density) 査読有り

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

素粒子論研究 114 巻 ( 2 ) 頁： B7 - B12 2006年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：素粒子論グループ素粒子論研究編集部

Invariant mass spectra of low-mass vector mesons in the e^+e^- channel are measured in 12 GeV p+C and p+Cu reactions (√<s>=5.1 GeV) at the KEK 12 GeV Proton Synchrotron. A significant excess is observed on the low-mass side of the ω meson peak over the known hadronic sources in the data of both C and Cu targets. Furthermore, an excess is found below the φ meson peak in the Cu target data in the slowest βγ region (βγ<1.25). They can be interpreted as signatures of the spectral modification of vector mesons in cold nuclear matter.

DOI： 10.24532/soken.114.2_B7

CiNii Books

Radiation induced surface activation on SUS304 rod surface coated with thin film layer formed by vacuum evaporation method 査読有り

J. Zhang, Y. Saito, K. Mishima, M. Hino, M. Kitaguchi, Y. Kawabata

KURRI Progress Report 頁： 177- 2006年

J-PARC中性子共鳴スピンエコー分光器の概念設計II

日野正裕, 川端祐司, 田崎誠司, 丸山龍治, 北口雅暁, 海老沢徹, 阿知波紀郎

日本原子力学会年会・大会予稿集 2005 巻 ( 0 ) 頁： 117 - 117 2005年

出版者・発行元：一般社団法人日本原子力学会

中性子散乱は、物質研究に対する最も有力な手段の一つであり、現在、世界最高性能を有する大強度パルス中性子源（J-PARC）が東海村に建設中である。中性子スピンエコー法は、中性子のスピンという自由度を導入したことにより、入射中性子のエネルギー分解能に制限されること無く、高エネルギー分解能かつ高中性子強度を同時に実現する。その結果、分子鎖のサイズに対応する空間分解能が約0.1 - 100nm において、NMR等の他の分光法では測定不可能であったエネルギー分解能 5x10-9 - 2x10-3 eVの動的過程が観測できる。我々は中性子スピン干渉の原理を用いることで従来のスピンエコー装置の設計概念を大幅に改良し、J-PARCに最適なスローダイナミックス研究の分光器を提案している。現在Mcstasといシミュレーションコードを用いて、ビームラインの中性子輸送の定量的評価も行っている。当日はビームラインの詳細や開発の進捗状況を説明する。

DOI： 10.11561/aesj.2005s.0.117.0

Cold-neutron interferometry using beam splitting etalons 査読有り

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 529 巻 ( 1-3 ) 頁： 190 - 193 2004年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Experimental signature of in-medium mass modification of vector mesons at normal nuclear density 査読有り

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 30 巻 ( 8 ) 頁： S1023 - S1026 2004年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Spectrometer for measurements of phi mesons in nuclear matter produced through 12-GeV p + A reactions 査読有り

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'yo

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 516 巻 ( 2-3 ) 頁： 390 - 405 2004年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Beam splitting etalons with a spacing of 189μm thickness

M.Kitaguchi, H.Funahashi, K.Taketani, M.Hino, S.Tasaki, R.Maruyama, Y.Otake, H.M.Shimizu

Activity report on neutron scattering research 11 巻頁： 219 - 0 2004年

Recent progress of cold-neutron interferometer using multilayer mirrors

Masaaki Kitaguchi

hamon 14 巻 ( 3 ) 頁： 204 - 208 2004年

Non-dispersive measurement of the transverse coherence length of a cold neutron beam 査読有り

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

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 72 巻 ( 12 ) 頁： 3079 - 3081 2003年12月

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

Web of Science

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