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Lu, K.; Takamizawa, Hisashi; Li, Y.; Masaki, Koichi*; Takagoshi, Daiki*; Nagai, Masaki*; Nannichi, Takashi*; Murakami, Kenta*; Kanto, Yasuhiro*; Yashirodai, Kenji*; et al.
Mechanical Engineering Journal (Internet), 10(4), p.22-00484_1 - 22-00484_13, 2023/08
Koshiro, Hidehiko; Nagai, Yuki
Journal of the Physical Society of Japan, 90(3), p.034711_1 - 034711_8, 2021/03
Times Cited Count:4 Percentile:49.47(Physics, Multidisciplinary)no abstracts in English
Makii, Hiroyuki; Nagai, Yasuki*; Shima, Tatsushi*; Segawa, Mariko; Mishima, Kenji*; Ueda, Hitoshi*; Igashira, Masayuki*; Osaki, Toshiro*
Physical Review C, 80(6), p.065802_1 - 065802_16, 2009/10
Times Cited Count:32 Percentile:83.95(Physics, Nuclear)We measured the -ray angular distribution from CO to the ground state of O using a pulsed beam at and 1.4 MeV. True events of CO were discriminated from background events due to neutrons from C()O with a time-of-flight method. The obtained -ray spectrum with anti-Compton NaI(Tl) spectrometers showed a characteristic line shape from CO: the Doppler broadening and energy loss of particles in C targets. The astrophysical S factors for and , and , derived from the present cross sections are in excellent agreement with the values derived by -matrix calculation of the -delayed spectrum of N, and by using the asymptotic normalization constant in the -matrix fit.
Nagai, Yasuki*; Segawa, Mariko; Osaki, Toshiro*; Matsue, Hideaki; Muto, Kazuo*
Physical Review C, 76(5), p.051301_1 - 051301_6, 2007/11
Times Cited Count:9 Percentile:56.38(Physics, Nuclear)The primary 1 -ray transition strength from the thermal neutron capture of O to the 3/2 state, 18 keV below the neutron threshold of O, was found to be about two hundred thousand times stronger than that to the 1/2 excited state, 729 keV below the threshold. In addition, the 1 strength from the 3/2 state leading to the 3/2 state with three () neutrons was six times stronger than that to the 5/2 ground state with a single () neutron. These anomalous -ray decay patterns give the first clear experimental evidence for the predicted property of the 3/2 state as mainly having a one-hole-four-particle configuration. Unique features of the O ground state with a two-hole-four-particle configuration and of the 3/2 state combined with a discrete prompt -ray spectroscopy following the thermal neutron capture of O enabled us to exclusively identify the configuration of the 3/2 state.
Koizumi, Mitsuo; Osa, Akihiko; Toh, Yosuke; Kimura, Atsushi; Mizumoto, Motoharu; Oshima, Masumi; Igashira, Masayuki*; Osaki, Toshiro*; Harada, Hideo*; Furutaka, Kazuyoshi*; et al.
Nuclear Instruments and Methods in Physics Research A, 562(2), p.767 - 770, 2006/06
Times Cited Count:6 Percentile:43.85(Instruments & Instrumentation)In order to measure the neutron capture cross section of minor actinides, we have proposed the use of a 4 Ge spectrometer. A Time-of-Flight neutron beam line for the experiment has been constructed at the KURRI electron LINAC. The assembling of the 4 Ge spectrometer is in progress. We are also developing a new data acquisition system based on a digital processing technique.
Igashira, Masayuki*; Osaki, Toshiro*; Nagai, Yasuki*; Yamana, Hajimu*; Fujii, Toshiyuki*; Takamiya, Koichi*; Harada, Hideo; Furutaka, Kazuyoshi; Nakamura, Shoji
JNC TY8400 2005-009, 186 Pages, 2005/09
Accurate fast-neutron capture cross sections of long-lived fission products (LLFPs) are indispensable for the R&D of nuclear transmutation systems which utilize the fast-neutron capture reaction. The accuracy of those cross section data contained nuclear data libraries are, however, quite inadequate. Therefore, accurate experimental data on those cross sections are necessary as the basic data usefule for the evaluation of capture cross sections of LLFPs. The final goal of the present study is to obtain the results with the errors from 5 to 10% fore the fast-neutron capture cross sections of Tc and tentative results with the errors of about 10% for those of Zr, using the electron linear accelerator based neutron source at the Oak Ridege National Laboratory. For this goal, the four research items were executed: (1) the separation, purification and analysis of LLFP samples, (2) the improvement of weighting function of -ray detector, (3) the measurement of fast-neutron capture cross sections of impurity isotopes in LLFP samples, and (4) the measurement of fast-neutron capture cross sections of Tc and Zr. The final goal was not reached due to the long-term trouble of the electron linear accelerator, but sufficient results were obtained for the other items. In particular, the present results for the capture cross sections and capture -ray spectra of Zr wer important nuclear data for the R&D of nuclear transmutation systems.
Goto, Jun; Sugawara, Masahiko*; Oshima, Masumi; Toh, Yosuke; Kimura, Atsushi; Osa, Akihiko; Koizumi, Mitsuo; Mizumoto, Motoharu; Osaki, Toshiro*; Igashira, Masayuki*; et al.
AIP Conference Proceedings 769, p.788 - 791, 2005/05
no abstracts in English
Nagai, Takayuki; Kameshiro, Naoki*; Kobayashi, Yuichi*; Tanaka, Hitoshi*; Tayama, Toshimitsu; Myochin, Munetaka
Nihon Genshiryoku Gakkai Wabun Rombunshi, 2(3), p.269 - 278, 2003/09
None
Okagawa, Seigo; Nagai, Hitoshi*; Abe, Hitoshi*; Tashiro, Shinsuke
JAERI-Tech 2003-068, 17 Pages, 2003/08
To study the release mechanism of iodine from the dissolver solution in the nuclear fuel reprocessing plants to the atmosphere at criticality accidents, the characteristics of redox of iodine species in various solutions must be examined. In the present work, the effect of -ray irradiation on the redox reaction was examined in the nitric acid solution of 1M and 3M. Without irradiation, most of iodine in 1M nitric acid solutions were exist in the form of I. In 3M nitric acid solutions, iodine was oxidized to I. When the solutions were irradiated by -ray with exposure of more than 4C/kg, I was disappeared regardless of nitric acid concentration. At exposure of 120C/kg, iodine was oxidized to IO. At exposure of 4800C/kg, iodine was exist in the form of IO in 1M nitric acid solution. On the other hand, iodine in 3M nitric acid solution was reduced to I at the same exposure. In the irradiated solution, nitrous acid was found, which would be produced from nitric acid by -ray irradiation.
Nagai, Shiro
Hikari Araiansu, 12(12), p.34 - 36, 2001/12
no abstracts in English
Tang, Z.; Zhang, Z.; Narumi, Kazumasa; Xu, Y.; Naramoto, Hiroshi; Nagai, Shiro; Miyashita, Kiyoshi*
Journal of Applied Physics, 89(3), p.1959 - 1964, 2001/02
Times Cited Count:30 Percentile:72.75(Physics, Applied)no abstracts in English
Koike, Masato; Namioka, Takeshi*; Gullikson, E. M.*; Harada, Yoshihisa*; Ishikawa, Sadayuki*; Imazono, Takashi*; Mrowka, S.*; Miyata, Noboru; Yanagihara, Mihiro*; Underwood, J. H.*; et al.
Soft X-Ray and EUV Imaging Systems (Proceedings of SPIE Vol.4146), p.163 - 170, 2000/00
no abstracts in English
Abe, Hitoshi; Tashiro, Shinsuke; Nagai, Hitoshi; Koike, Tadao; Okagawa, Seigo; Murata, Mikio
JAERI-Tech 99-067, p.23 - 0, 1999/09
no abstracts in English
*; J.A.van-den-Berg*; Nagai, Shiro; D.G.Armour*
Nuclear Instruments and Methods in Physics Research B, 148, p.673 - 677, 1999/00
Times Cited Count:26 Percentile:84.89(Instruments & Instrumentation)no abstracts in English
; Namba, Hideki; Aoki, Yasushi; Nagai, Shiro; *
Radiation Physics and Chemistry, 49(2), p.253 - 256, 1997/00
Times Cited Count:3 Percentile:30.37(Chemistry, Physical)no abstracts in English
*; Aoki, Yasushi; Nagai, Shiro
Nuclear Instruments and Methods in Physics Research B, 108, p.75 - 80, 1996/00
Times Cited Count:2 Percentile:31.89(Instruments & Instrumentation)no abstracts in English
*; Aoki, Yasushi; Nagai, Shiro
JAERI-Research 94-018, 45 Pages, 1994/10
no abstracts in English
Aoki, Yasushi; Namba, Hideki; Hosoi, Fumio; Nagai, Shiro
ACS Symposium Series, 579; Polymeric Materials for Microelectronic Applications,Science and Technology, 0, p.45 - 50, 1994/00
no abstracts in English
*; Aoki, Yasushi; Yoda, Osamu; Nagai, Shiro
Nuclear Instruments and Methods in Physics Research B, 88, p.261 - 266, 1994/00
Times Cited Count:19 Percentile:82.28(Instruments & Instrumentation)no abstracts in English
*; Aoki, Yasushi; Nagai, Shiro
Dai-4-Kai Ryushisen No Sentanteki Oyo Gijutsu Ni Kansuru Shimpojiumu, p.175 - 178, 1993/00
no abstracts in English