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Journal Articles

Neutron flux and energy resolution of direct-geometry disk-chopper spectrometer AMATERAS at J-PARC

Nirei, Masami; Kofu, Maiko; Nakajima, Kenji; Kikuchi, Tatsuya*; Kawamura, Seiko; Murai, Naoki; Harada, Masahide; Inamura, Yasuhiro

Journal of Neutron Research, 26(2-3), p.75 - 82, 2024/09

Journal Articles

Experimental evidence for the significance of optical phonons in thermal transport of tin monosulfide

Wu, P.*; Murai, Naoki; Li, T.*; Kajimoto, Ryoichi; Nakamura, Mitsutaka; Kofu, Maiko; Nakajima, Kenji; Xia, K.*; Peng, K.*; Zhang, Y.*; et al.

New Journal of Physics (Internet), 25(1), p.013032_1 - 013032_11, 2023/01

 Times Cited Count:0 Percentile:0.00(Physics, Multidisciplinary)

Journal Articles

Recent update of AMATERAS; A Cold-neutron disk-chopper spectrometer

Nakajima, Kenji; Kawamura, Seiko; Kofu, Maiko; Murai, Naoki; Inamura, Yasuhiro; Kikuchi, Tatsuya*; Wakai, Daisuke*

JPS Conference Proceedings (Internet), 33, p.011089_1 - 011089_7, 2021/03

The recent update of AMATERAS, a cold-neutron disk-chopper spectrometer at Japan Proton Accelerator Research Complex (J-PARC), is reported. AMATERAS has been operating for a decade. Since 2017, some updates have been done or are underway, which include installing new detectors, replacing the vacuum system of the scattering chamber, and other works. We are also working on the re-investigation of the resolution function. Demonstration measurements were carried out at 1MW test operations done in 2018 and 2019. Plans of upgrading the spectrometer are currently being considered.

Journal Articles

Field-tuned magnetic structure and phase diagram of the honeycomb magnet YbCl$$_3$$

Hao, Y. Q.*; Wo, H. L.*; Gu, Y. M.*; Zhang, X. W.*; Gu, Y. Q.*; Zheng, S. Y.*; Zhao, Y.*; Xu, G. Y.*; Lynn, J. W.*; Nakajima, Kenji; et al.

Science China; Physics, Mechanics & Astronomy, 64(3), p.237411_1 - 237411_6, 2021/03

 Times Cited Count:11 Percentile:69.72(Physics, Multidisciplinary)

Journal Articles

$$q$$=0 long-range magnetic order in centennialite CaCu$$_{3}$$(OD)$$_{6}$$Cl$$_{2}$$ $$cdot$$ 0.6D$$_{2}$$O; A Spin-$$frac{1}{2}$$ perfect kagome antiferromagnet with $$J_{1}$$-$$J_{2}$$-$$J_{d}$$

Iida, Kazuki*; Yoshida, Hiroyuki*; Nakao, Akiko*; Jeschke, H. O.*; Iqbal, Y.*; Nakajima, Kenji; Kawamura, Seiko; Munakata, Koji*; Inamura, Yasuhiro; Murai, Naoki; et al.

Physical Review B, 101(22), p.220408_1 - 220408_6, 2020/06

 Times Cited Count:26 Percentile:79.28(Materials Science, Multidisciplinary)

Crystal and magnetic structures of the mineral centennialite CaCu$$_{3}$$(OD)$$_{6}$$Cl$$_{2}$$ $$cdot$$ 0.6D$$_{2}$$O are investigated by means of synchrotron X-ray diffraction and neutron diffraction measurements complemented by density functional theory (DFT) and pseudofermion functional renormalization group (PFFRG) calculations. In CaCu$$_{3}$$(OD)$$_{6}$$Cl$$_{2}$$ $$cdot$$ 0.6D$$_{2}$$O, Cu$$^{2+}$$ ions form a geometrically perfect kagome network with antiferromagnetic $$J_{1}$$. No intersite disorder between Cu$$^{2+}$$ and Ca$$^{2+}$$ ions is detected. CaCu$$_{3}$$(OD)$$_{6}$$Cl$$_{2}$$ $$cdot$$ 0.6D$$_{2}$$O enters a magnetic long-range ordered state below $$T_{rm N}$$ = 7.2 K, and the $$q$$=0 magnetic structure with negative vector spin chirality is obtained. The ordered moment at 0.3 K is suppressed to 0.58(2)$$mu$$B. Our DFT calculations indicate the presence of antiferromagnetic $$J_{2}$$ and ferromagnetic $$J_{d}$$ superexchange couplings of a strength which places the system at the crossroads of three magnetic orders (at the classical level) and a spin-$$frac{1}{2}$$ PFFRG analysis shows a dominance of $$q$$=0 type magnetic correlations, consistent with and indicating proximity to the observed $$q$$=0 spin structure. The results suggest that this material is located close to a quantum critical point and is a good realization of a $$J_{1}$$-$$J_{2}$$-$$J_{d}$$ kagome antiferromagnet.

Journal Articles

Coexisting spin resonance and long-range magnetic order of Eu in EuRbFe$$_{4}$$As$$_{4}$$

Iida, Kazuki*; Nagai, Yuki; Ishida, Shigeyuki*; Ishikado, Motoyuki*; Murai, Naoki; Christianson, A. D.*; Yoshida, Hiroyuki*; Inamura, Yasuhiro; Nakamura, Hiroki; Nakao, Akiko*; et al.

Physical Review B, 100(1), p.014506_1 - 014506_8, 2019/07

 Times Cited Count:38 Percentile:84.31(Materials Science, Multidisciplinary)

Magnetic excitations and magnetic structure of EuRbFe$$_{4}$$As$$_{4}$$ were investigated by neutron scattering measurements.

Journal Articles

Status report of the chopper spectrometer 4SEASONS

Kajimoto, Ryoichi; Nakamura, Mitsutaka; Inamura, Yasuhiro; Kamazawa, Kazuya*; Ikeuchi, Kazuhiko*; Iida, Kazuki*; Ishikado, Motoyuki*; Murai, Naoki; Kira, Hiroshi*; Nakatani, Takeshi; et al.

Journal of Physics; Conference Series, 1021(1), p.012030_1 - 012030_6, 2018/06

BB2016-1727.pdf:0.39MB

 Times Cited Count:3 Percentile:86.33(Nuclear Science & Technology)

Journal Articles

Spin resonance in the new-structure-type iron-based superconductor CaKFe$$_{4}$$As$$_{4}$$

Iida, Kazuki*; Ishikado, Motoyuki*; Nagai, Yuki; Yoshida, Hiroyuki*; Christianson, A. D.*; Murai, Naoki; Kawashima, Kenji*; Yoshida, Yoshiyuki*; Eisaki, Hiroshi*; Iyo, Akira*

Journal of the Physical Society of Japan, 86(9), p.093703_1 - 093703_4, 2017/09

 Times Cited Count:26 Percentile:79.59(Physics, Multidisciplinary)

Journal Articles

Development of superconducting proton linac for ADS

Ouchi, Nobuo; Akaoka, Nobuo*; Asano, Hiroyuki*; Chishiro, Etsuji; Namekawa, Yuya*; Suzuki, Hiroyuki*; Ueno, Tomoaki*; Noguchi, Shuichi*; Kako, Eiji*; Ouchi, Norihito*; et al.

Proceedings of 4th International Workshop on the Utilisation and Reliability of High Power Proton Accelerators, p.175 - 183, 2005/11

no abstracts in English

Journal Articles

Irradiation test for verification of PWR 48GWd/t high burnup fuel

Okubo, Tadatsune*; Tsukuda, Yoshiaki*; Kamimura, Katsuichiro*; Murai, Kenji*; Goto, Ken*; Doi, Soichi*; Senda, Yasuhide*; Kosaka, Yuji*; Kido, Toshiya*; Murata, Tamotsu*; et al.

Nihon Genshiryoku Gakkai-Shi, 43(9), p.906 - 915, 2001/09

 Times Cited Count:0 Percentile:0.00(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Development of superconducting cavities at JAERI

Ouchi, Nobuo; Kusano, Joichi; Akaoka, Nobuo*; Mizumoto, Motoharu; Inoue, Hitoshi*; Noguchi, Shuichi*; Saito, Kenji*; Takeda, O.*; Murai, T.*; Kijima, Y.*; et al.

KEK Proceedings 99-25, p.33 - 37, 2000/02

no abstracts in English

Journal Articles

Mechanical strength of superconducting cavities at RT and cryogenic temperature

Mukugi, Ken*; Murai, Takashi*; Ouchi, Nobuo; Kusano, Joichi; Mizumoto, Motoharu; Saito, Kenji*

Nihon Kikai Gakkai Kanto Shibu Ibaraki Koenkai (2000) Koen Rombunshu, 2 Pages, 2000/00

no abstracts in English

Oral presentation

Recent upgrades and current status of cold-neutron disk-chopper spectrometer AMATERAS

Kawamura, Seiko; Kofu, Maiko; Murai, Naoki; Inamura, Yasuhiro; Nirei, Masami; Piyawongwatthana, P.; Wakai, Daisuke*; Nakajima, Kenji

no journal, , 

Oral presentation

The Performance assessment and upgrade plan of cold neutron disk chopper spectrometer AMATERAS

Nirei, Masami; Kofu, Maiko; Nakajima, Kenji; Kikuchi, Tatsuya*; Kawamura, Seiko; Murai, Naoki; Harada, Masahide; Inamura, Yasuhiro

no journal, , 

no abstracts in English

Oral presentation

AMATERAS: A Cold-neutron disk chopper spectrometer; Current status and recent outcomes

Nakajima, Kenji; Kawamura, Seiko; Kofu, Maiko; Murai, Naoki; Inamura, Yasuhiro; Kikuchi, Tatsuya*; Wakai, Daisuke*

no journal, , 

AMATERAS is one of the first generation disk-chopper spectrometers with pulse-shaping operation as with CNCS at SNS and LET at ISIS, and it is designed to carry out inelastic and quasielastic neutron scattering experiments in the range from cold to sub-thermal neutron energy with high intensity and fine and flexible energy resolution. AMATERAS started its operation from May 2009 and was opened for the user program from December 2009. Up to now, experiments of more than 160 proposals have been carried out, which resulted in more than 50 papers, 15 theses and 11 press releases. Also, AMATERAS took part in the social activities of MLF, for example, hands-on-experiments at AONSA Neutron Schools. Along with performing a user program, we are continually maintaining and improving the performance of the spectrometer. In this presentation, we will show the over view and current status of AMATERAS and recent scientific highlights obtained from experiments by using AMATERAS.

Oral presentation

The Cold neutron disk-chopper spectrometer AMATERAS; Overview and recent scientific outcomes

Nakajima, Kenji; Kawamura, Seiko; Kofu, Maiko; Murai, Naoki; Inamura, Yasuhiro; Kikuchi, Tatsuya*; Wakai, Daisuke*

no journal, , 

AMATERAS is a cold-neutron disk-chopper spectrometer installed at BL14 port of the Materials and Life Science Experimental Facility (MLF) at J-PARC. In this presentation, we will show overview of AMATERAS including recent scientific outcomes obtained by using this spectrometer.

Oral presentation

Current status of AMATERAS; A Cold-neutron disk-chopper spectrometer

Nakajima, Kenji; Kawamura, Seiko; Kofu, Maiko; Murai, Naoki; Inamura, Yasuhiro; Kikuchi, Tatsuya*; Wakai, Daisuke*

no journal, , 

Oral presentation

Neutron scattering study of spin dynamics in spin glasses

Kofu, Maiko; Yamamuro, Osamu*; Watanuki, Ryuta*; Sakakibara, Toshiro*; Kawamura, Seiko; Murai, Naoki; Nakajima, Kenji; Matsuura, Masato*; Ueki, Takeshi*; Akutsu, Kazuhiro*; et al.

no journal, , 

no abstracts in English

Oral presentation

Measurement of neutron flux of disk-chopper spectrometer AMATERAS

Nirei, Masami; Kofu, Maiko; Harada, Masahide; Nakajima, Kenji; Kawamura, Seiko; Murai, Naoki; Inamura, Yasuhiro

no journal, , 

no abstracts in English

Oral presentation

A Cold-neutron disk-chopper spectrometer AMATERA in JFY2019

Nakajima, Kenji; Kawamura, Seiko; Kofu, Maiko; Murai, Naoki; Inamura, Yasuhiro; Kikuchi, Tatsuya*; Wakai, Daisuke*

no journal, , 

no abstracts in English

Oral presentation

Structured excitation continuum and short-range correlations in a spin-1/2 triangular lattice antiferromagnet $$mathrm{Ba_3CoSb_2O_9}$$

Kojima, Yuki*; Nakajima, Kenji; Kurita, Nubuyuki*; Tanaka, Hidekazu*; Kawamura, Seiko; Murai, Naoki

no journal, , 

no abstracts in English

21 (Records 1-20 displayed on this page)