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Journal Articles

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

Sakai, Kenji; Oku, Takayuki; Shinohara, Takenao; Kira, Hiroshi; Oi, Motoki; Maekawa, Fujio; Kakurai, Kazuhisa; Ino, Takashi*; Arimoto, Yasushi*; Shimizu, Hirohiko*; et al.

Journal of Physics; Conference Series, 340, p.012037_1 - 012037_7, 2012/02

 Times Cited Count:2 Percentile:64.41

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 (n-N) spin correlation term at a resonant peak of $$^{129}$$Xe is planned. The Xe gas having a high polarization under low magnetic field and room temperature by a spin exchange optical pumping (SEOP) technique is expected to become a suitable target for verification of the neutron optical theorem (NOPT). We evaluated measurable quantities based on the NOPT, developed a polarized Xe gas system, and carried out a feasibility test of our apparatus. This paper reports on the present status of the experiment.

Journal Articles

Developments of in-situ SEOP polarized $$^{3}$$He neutron spin filter in Japan

Kira, Hiroshi; Sakaguchi, Yoshifumi; Oku, Takayuki; Suzuki, Junichi; Nakamura, Mitsutaka; Arai, Masatoshi; Endo, Yasuo; Chang, L.-J.; Kakurai, Kazuhisa; Arimoto, Yasushi*; et al.

Journal of Physics; Conference Series, 294, p.012014_1 - 012014_5, 2011/06

 Times Cited Count:11 Percentile:95.64

Journal Articles

Applications of $$^{3}$$He neutron spin filters on the small-angle neutron scattering spectrometer SANS-J-II

Sakaguchi, Yoshifumi; Kira, Hiroshi; Oku, Takayuki; Shinohara, Takenao; Suzuki, Junichi; Sakai, Kenji; Nakamura, Mitsutaka; Aizawa, Kazuya; Arai, Masatoshi; Noda, Yohei; et al.

Journal of Physics; Conference Series, 294(1), p.012017_1 - 012017_7, 2011/06

 Times Cited Count:2 Percentile:68.37

Journal Articles

Structure of glasses for $$^{3}$$He neutron spin filter cells

Sakaguchi, Yoshifumi; Kira, Hiroshi; Oku, Takayuki; Shinohara, Takenao; Suzuki, Junichi; Sakai, Kenji; Nakamura, Mitsutaka; Suzuya, Kentaro; Aizawa, Kazuya; Arai, Masatoshi; et al.

Journal of Physics; Conference Series, 294(1), p.012004_1 - 012004_7, 2011/06

 Times Cited Count:2 Percentile:68.37

Journal Articles

Development and test of SEOP neutron spin filter in Japan

Kira, Hiroshi; Sakaguchi, Yoshifumi; Oku, Takayuki; Suzuki, Junichi; Nakamura, Mitsutaka; Arai, Masatoshi; Kakurai, Kazuhisa; Endo, Yasuo; Arimoto, Yasushi*; Ino, Takashi*; et al.

Physica B; Condensed Matter, 406(12), p.2433 - 2435, 2011/06

 Times Cited Count:8 Percentile:39.13(Physics, Condensed Matter)

Journal Articles

Research on glass cells for $$^{3}$$He neutron spin filters

Sakaguchi, Yoshifumi; Kira, Hiroshi; Oku, Takayuki; Shinohara, Takenao; Suzuki, Junichi; Sakai, Kenji; Nakamura, Mitsutaka; Suzuya, Kentaro; Aizawa, Kazuya; Arai, Masatoshi; et al.

Physica B; Condensed Matter, 406(12), p.2443 - 2447, 2011/06

Journal Articles

Research on glass cells for $$^{3}$$He neutron spin filters

Sakaguchi, Yoshifumi; Kira, Hiroshi; Oku, Takayuki; Shinohara, Takenao; Suzuki, Junichi; Sakai, Kenji; Nakamura, Mitsutaka; Suzuya, Kentaro; Aizawa, Kazuya; Arai, Masatoshi; et al.

Physica B; Condensed Matter, 406(12), p.2443 - 2447, 2011/06

 Times Cited Count:3 Percentile:17.85(Physics, Condensed Matter)

Journal Articles

Characterization of glasses for $$^{3}$$He neutron spin filter cells

Sakaguchi, Yoshifumi; Kira, Hiroshi; Oku, Takayuki; Shinohara, Takenao; Suzuki, Junichi; Sakai, Kenji; Nakamura, Mitsutaka; Suzuya, Kentaro; Arai, Masatoshi; Takeda, Masayasu; et al.

Nuclear Instruments and Methods in Physics Research A, 634(1, Suppl.), p.S122 - S125, 2011/04

Journal Articles

MeV- and sub-MeV-photon sources based on Compton backscattering at SPring-8 and KPSI-JAEA

Kawase, Keigo; Kando, Masaki; Hayakawa, Takehito; Daito, Izuru; Kondo, Shuji; Homma, Takayuki; Kameshima, Takashi; Kotaki, Hideyuki; Chen, L.*; Fukuda, Yuji; et al.

Nuclear Physics Review, 26(Suppl.), p.94 - 99, 2009/07

We constructed MeV- and sub-MeV-photon sources by means of Compton backscattering with a laser light and an electron beam at SPring-8 and KPSI-JAEA. MeV-photon source consists of a continuous-wave optically-pumped far infrared laser and an 8-GeV stored electron beam. Sub-MeV-photon source consists of a Nd:YAG pulse-laser and an 150-MeV electron beam accelerated by a microtron. Both source have been succeeded backscattered photon generation. In this talk, I will present characteristics and future prospects of these photon sources.

Journal Articles

MeV $$gamma$$-ray generation from backward Compton scattering at SPring-8

Kawase, Keigo; Arimoto, Yasushi*; Fujiwara, Mamoru; Okajima, Shigeki*; Shoji, Masazumi*; Suzuki, Shinsuke*; Tamura, Kazuhiro*; Yorita, Tetsuhiko*; Okuma, Haruo*

Nuclear Instruments and Methods in Physics Research A, 592(3), p.154 - 161, 2008/07

 Times Cited Count:19 Percentile:79.01(Instruments & Instrumentation)

A test experimental line at SPring-8 has been constructed for the generation of backward Compton scattered (BCS) $$gamma$$-ray by head-on collision between an 8 GeV electron beam and a far-infrared (FIR) laser. For the FIR laser, we use a continuous-wave methanol laser optically pumped by a carbon dioxide ($${rm CO}_{2}$$) laser. The FIR laser output power achieved is 1.6 W at maximum for 118.8 $$mu$$m lasing; this value is the highest in the case of this type of laser. As a result of the direct measurement, the generated BCS $$gamma$$-ray flux was found to be about $$10^{3}$$ photons/s. This value is consistent with the estimation calculated by taking into account the input laser power and the transmittance of the laser transport system.

Journal Articles

Di-triton molecular structure in $$^{6}$$He

Akimune, Hidetoshi*; Yamagata, Tamio*; Nakayama, Shintaro*; Arimoto, Yasushi*; Fujiwara, Mamoru; Fushimi, Kenichi*; Hara, Keigo*; Ota, Masahisa*; Shiokawa, Atsuko*; Tanaka, Masayoshi*; et al.

Physical Review C, 67(5), p.051302_1 - 051302_4, 2003/05

 Times Cited Count:26 Percentile:79.94(Physics, Nuclear)

no abstracts in English

Oral presentation

Development of polarized $${}^{3}$$He neutron spin filters, 3

Sakaguchi, Yoshifumi; Kira, Hiroshi; Oku, Takayuki; Suzuki, Junichi; Nakamura, Mitsutaka; Arai, Masatoshi; Endo, Yasuo; Kakurai, Kazuhisa; Takeda, Masayasu; Wakimoto, Shuichi; et al.

no journal, , 

Polarized neutron scattering is a powerful technique in order to clarify the magnetic structure of materials. The technique is often used in JRR-3 nowadays. However, the available energy has been limited below 100 meV as long as we use the conventional polarizing method. To realize polarized neutron scattering experiments above the energy, the use of $$^{3}$$He spin filters is the best solution. In addition, in the new pulsed neutron facility, J-PARC, the neutron source has wide energy spectrum. To polarize all the neutrons, it is desired to use the $$^{3}$$He spin filters. Taking these backgrounds into account, we are now planning to introduce $$^{3}$$He neutron spin filters to polarized neutron experiments at JRR-3 and J-PARC. In our oral presentation, we report the detailed plan of the experiments and the present status of the preparation.

Oral presentation

Development of a neutron diffractometer with the $$^{3}$$He spin filter technique

Sakaguchi, Yoshifumi; Oyama, Kenji*; Hiraka, Haruhiro*; Tsutsumi, Kenji*; Ino, Takashi*; Arimoto, Yasushi*; Takeda, Masayasu; Suzuki, Junichi; Yamada, Kazuyoshi*; Kakurai, Kazuhisa

no journal, , 

After the birth of a new neutron scattering facility, MLF at J-PARC, it is desired to establish the most suitable polarizing technique for the facility. In MLF the white neutron beam over the wide energy range is used and the use of $$^{3}$$He spin filter technique is the best one. However, the technological level in Japan is far below the world's top level. To realize the polarized neutron scattering experiments using $$^{3}$$He spin filters in MLF, it is necessary to make the experiments at a reactor neutron facility first and to establish the required technique. Therefore, we have performed polarized neutron experiments at HERMES in JRR-3. We used the monochromatized neutron beam with 1.82 ${AA}$. We measured the flipping ratio at the 111 reflection of single-crystalline Cu$$_{2}$$MnAl and the change was observed. The details of the experimental setup and the results will be reported.

Oral presentation

Development of polarized $$^{3}$$He neutron spin filters, 2

Kira, Hiroshi; Sakaguchi, Yoshifumi; Oku, Takayuki; Suzuki, Junichi; Nakamura, Mitsutaka; Arai, Masatoshi; Endo, Yasuo; Kakurai, Kazuhisa; Arimoto, Yasushi*; Ino, Takashi*; et al.

no journal, , 

no abstracts in English

Oral presentation

Development of $$^{3}$$He polarized neutron spin filters and its present status, 2

Kira, Hiroshi; Sakaguchi, Yoshifumi; Oku, Takayuki; Suzuki, Junichi; Nakamura, Mitsutaka; Arai, Masatoshi; Endo, Yasuo; Kakurai, Kazuhisa; Arimoto, Yasushi*; Ino, Takashi*; et al.

no journal, , 

no abstracts in English

Oral presentation

Development of glass cells for polarized $$^{3}$$He neutron spin filters

Sakaguchi, Yoshifumi; Kira, Hiroshi; Oku, Takayuki; Suzuki, Junichi; Nakamura, Mitsutaka; Arai, Masatoshi; Endo, Yasuo; Kakurai, Kazuhisa; Takeda, Masayasu; Wakimoto, Shuichi; et al.

no journal, , 

no abstracts in English

Oral presentation

Application of polarization neutron by $$^{3}$$He filter technique for condensed-matter physics; Development of spin control devices

Tsutsumi, Kenji*; Oyama, Kenji*; Hiraka, Haruhiro*; Yamaguchi, Yasuo*; Ino, Takashi*; Oku, Takayuki; Sakaguchi, Yoshifumi; Kira, Hiroshi; Arimoto, Yasushi*; Takeda, Masayasu; et al.

no journal, , 

no abstracts in English

Oral presentation

Development of polarization measurement devices for polarized $$^{3}$$He gas neutron spin filters

Kira, Hiroshi; Sakaguchi, Yoshifumi; Oku, Takayuki; Suzuki, Junichi; Nakamura, Mitsutaka; Arai, Masatoshi; Endo, Yasuo; Arimoto, Yasushi*; Ino, Takashi*; Shimizu, Hirohiko*; et al.

no journal, , 

no abstracts in English

Oral presentation

Japan-Taiwan joint development project for polarized $$^{3}$$He

Chang, L.-J.; Oku, Takayuki; Kira, Hiroshi; Sakaguchi, Yoshifumi; Sakai, Kenji; Shinohara, Takenao; Suzuki, Junichi; Nakamura, Mitsutaka; Arai, Masatoshi; Takeda, Masayasu; et al.

no journal, , 

Oral presentation

Current status and perspective of neutron polarizing device development and application in neutron scattering experiments in Japan

Oku, Takayuki; Kira, Hiroshi; Sakaguchi, Yoshifumi; Sakai, Kenji; Suzuki, Junichi; Nakamura, Mitsutaka; Shinohara, Takenao; Koizumi, Satoshi; Takata, Shinichi; Aizawa, Kazuya; et al.

no journal, , 

Material and Life science experimental facility (MLF) of J-PARC center have started user program in which experiments using pulsed neutron beam are available from December 2008. The source power of the pulsed spallation neutron source JSNS is gradually increasing and now reached 120 KW, where its final goal is 1 MW. With increasing the neutron source power, the number of user programs is also increasing. In this situation, a 5-years project, which aims at higher efficient utilization of neutrons in neutron scattering research, have started since 2008 in Japan. Six Japanese institutes join this project, and neutron optical devices including $$^{3}$$He spin filters, neutron imaging device and neutron scattering method are being developed. In this paper, we report the current status of optical devices development and application and future perspective in Japan.

27 (Records 1-20 displayed on this page)