Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
N(n,
)
N reaction as a -ray intensity standard up to 11 MeVMiyazaki, Itaru*; Sakane, Hitoshi*; Takayama, Hirokazu*; Kasaishi, Masafumi*; Tojo, Akinori*; Furuta, Masataka*; Hayashi, Hiroaki*; Suematsu, Osamu*; Narasaki, Hiromichi*; Shimizu, Toshiaki*; et al.
Journal of Nuclear Science and Technology, 45(6), p.481 - 486, 2008/06
Times Cited Count：6 Percentile：39.07(Nuclear Science & Technology)The intensities of the prompt rays from the N(n,)N reaction have been precisely measured. As the samples, a liquid nitrogen target and a deuterated melamine (C
D
N) were used. The previous values widely used as intensity standards agreed with those obtained in this study within 4-5% in the 2-11 MeV region, however, showed a monotonous decrease with the increase of -ray energy.
Ge spectrometerKoizumi, 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：43.25(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.
Miyazaki, Itaru*; Shimizu, Toshiaki*; Shibata, Michihiro*; Kawade, Kiyoshi*; Furutaka, Kazuyoshi; Nakamura, Shoji; Sakane, Hitoshi
JNC TY8400 2005-002, 40 Pages, 2005/06
JNC-TY8400-2005-002.pdf:2.69MB
Accurate cross section data for the neutron capture of long-lived fission products (LLFP) are needed for developing a nuclear transmutation technology which reduces radioactive wastes by transmuting nuclides that have half-lives of as long as a few million years to other nuclides that have much shorter half-lives. There are some nuclides, whose cross sections cannot be measured in activation method. Utilization of prompt gamma-rays is expected to solve this problem. The aim of present study was twofold: (i) to measure emission probabilities of the high energy gamma-ray, up to 10MeV, emitted fromN(n, gamma)N reaction, which are usually used as standards, in order to improve their accuracies and (ii) to develop a measurement method for neutron capture cross sections by using prompt gamma-rays. Emission probabilities of principal prompt gamma-rays fromN(n, gamma)N reaction were determined with 0.2-0.9% errors. For ten nuclides,
Na,
Al,
55 Mn,
Ni,
Cu,
Pr,
W, and
capture cross sections were measured by using prompt gamma-rays and gamma-rays following b-decay. By comparing both cross section values, it was found that emission probabilities of prompt gamma-rays reported in the literatures were systematically larger than those inferred from the cross sections that were determined in activation methods. The cross section of a
Pd (n, gamma)
Pd reaction at thermal energy was measured. Considering transmutation of the nuclide, the cross section ofPd(n, gamma), which is an isotope of palladium, is also necessary. A lower limit of the cross section was determined with 6% accuracy. Additionally, a method of estimating an upper limit was examined by noting similarity of nuclear structures to the neighboring nuclides. It was estimated that the observed lower limit of emission probabilities correspond to 79% of the cross section.
Am and its EC-decay daughter 
PuAsai, Masato; Sakama, Minoru*; Tsukada, Kazuaki; Ichikawa, Shinichi; Haba, Hiromitsu*; Nishinaka, Ichiro; Nagame, Yuichiro; Goto, Shinichi*; Kojima, Yasuaki*; Oura, Yasuji*; et al.
European Physical Journal A, 23(3), p.395 - 400, 2005/02
Times Cited Count：16 Percentile：70.79(Physics, Nuclear)The EC decay of Am has been studied through -ray spectroscopy. Two EC-decaying states have been found in Am with half-lives of 3.6 min and 2.9 min. In Pu, we have found the 
octupole band and two-quasiparticle states one of which is a 
isomer with a 1.2 
s half-life. The EC transitions from Am to the two-quasiparticle states in Pu show small 
values of 4.8--5.3, which allowed us to assign proton-neutron configurations of Am and the two-quasiparticle states.
decays of 
AmAsai, Masato; Sakama, Minoru*; Tsukada, Kazuaki; Ichikawa, Shinichi; Haba, Hiromitsu*; Nishinaka, Ichiro; Nagame, Yuichiro; Goto, Shinichi*; Kojima, Yasuaki*; Oura, Yasuji*; et al.
European Physical Journal A, 22(3), p.411 - 416, 2004/12
Times Cited Count：9 Percentile：50.82(Physics, Nuclear)EC and decays of Am have been studied by means of -ray spectroscopy. Excited states in Pu have been established for the first time, and tentative spin-parity and Nilsson assignments were given to these levels. The ground state of Am was evaluated to be the ![$$pi 5/2^{-}[523]$$](/search/images/EROHA0JAGUXTEXT1FV4VWNJSGNOSI.gif)
state from the experimental results. It was found that the state in 
Np is located at 
15~keV, which allowed us to determine the 
value of Am as 6569
~keV, in combination with the measured -particle energy.
-decays of neutron-deficient americium isotopesSakama, Minoru*; Asai, Masato; Tsukada, Kazuaki; Ichikawa, Shinichi; Nishinaka, Ichiro; Nagame, Yuichiro; Haba, Hiromitsu*; Goto, Shinichi*; Shibata, Michihiro*; Kawade, Kiyoshi*; et al.
Physical Review C, 69(1), p.014308_1 - 014308_11, 2004/01
Times Cited Count：23 Percentile：75.47(Physics, Nuclear)no abstracts in English
-raysNakamura, Shoji; Takayama, Hirokazu*; Kawade, Kiyoshi*; Harada, Hideo
JAERI-Conf 2003-006, p.237 - 240, 2003/06
None
Sakama, Minoru*; Tsukada, Kazuaki; Asai, Masato; Ichikawa, Shinichi; Haba, Hiromitsu; Goto, Shinichi*; Nishinaka, Ichiro; Nagame, Yuichiro; Oura, Yasuji*; Kojima, Yasuaki*; et al.
Journal of Nuclear Science and Technology, 39(Suppl.3), p.34 - 37, 2002/11
no abstracts in English
decays of neutron-deficient transuranium isotopesAsai, Masato; Sakama, Minoru; Tsukada, Kazuaki; Ichikawa, Shinichi; Haba, Hiromitsu; Nishinaka, Ichiro; Nagame, Yuichiro; Goto, Shinichi; Kojima, Yasuaki*; Oura, Yasuji*; et al.
Journal of Nuclear Science and Technology, 39(Suppl.2), p.474 - 477, 2002/08
Neutron-deficient americium and curium isotopes with half-lives 
10 min have been produced with the tandem accelerator, and their EC and weak decays have been successfully measured through an on-line isotope separation. Decay schemes of 
Am have been established, and proton-neutron configurations in the parent and daughter nuclei have been determined. Observed transitions in 
Am were found to be the favored transitions between the Nilsson states. Information on nuclear structure, deformation, and atomic masses in this region were obtained.
Asai, Masato; Sakama, Minoru*; Tsukada, Kazuaki; Ichikawa, Shinichi; Haba, Hiromitsu; Nishinaka, Ichiro; Nagame, Yuichiro; Goto, Shinichi*; Akiyama, Kazuhiko; Toyoshima, Atsushi; et al.
Journal of Nuclear and Radiochemical Sciences, 3(1), p.187 - 190, 2002/06
EC and decays of neutron-deficient americium, curium, and berkelium nuclei have been studied using the JAERI on-line isotope separator. Decay schemes of 
Am have been established for the first time, and proton-neutron configurations in Am and Pu have been determined. transitions observed in 
Am were found to be the favored transitions between the Nilsson states. values of 
Cm have been determined. Nuclear structure, deformation, and atomic masses for these nuclei were discussed.
determination of neutron-rich isotope 
La with a total absorption detectorShibata, Michihiro*; Shindo, Terumasa*; Taniguchi, Akihiro*; Kojima, Yasuaki*; Kawade, Kiyoshi*; Ichikawa, Shinichi; Kawase, Yoichi*
Journal of the Physical Society of Japan, 71(5), p.1401 - 1402, 2002/05
Times Cited Count：8 Percentile：49.61(Physics, Multidisciplinary)no abstracts in English
aerosol jet system for mass separation of neutron-deficient actinide isotopesIchikawa, Shinichi; Tsukada, Kazuaki; Asai, Masato; Haba, Hiromitsu; Sakama, Minoru*; Kojima, Yasuaki*; Shibata, Michihiro*; Nagame, Yuichiro; Oura, Yasuji*; Kawade, Kiyoshi*
Nuclear Instruments and Methods in Physics Research B, 187(4), p.548 - 554, 2002/04
Times Cited Count：15 Percentile：66.96(Instruments & Instrumentation)no abstracts in English
- angular correlation coincidence counts using characteristic X-raysAsai, Masato*; Kawade, Kiyoshi*; Shibata, Michihiro*; Kojima, Yasuaki*; Osa, Akihiko; Koizumi, Mitsuo; Sekine, Toshiaki
Nuclear Instruments and Methods in Physics Research A, 463(1-2), p.205 - 212, 2001/05
Times Cited Count：3 Percentile：28.10(Instruments & Instrumentation)no abstracts in English
Kasugai, Yoshimi; Ikeda, Yujiro; Uno, Yoshitomo; Yamamoto, Hiroshi*; Kawade, Kiyoshi*
JAERI-Research 2001-025, 74 Pages, 2001/03
JAERI-Research-2001-025.pdf:2.29MB
no abstracts in English
determination without the knowledge of the decay schemeShibata, Michihiro*; Kojima, Yasuaki*; Uno, H.*; Kawade, Kiyoshi*; Taniguchi, Akihiro*; Kawase, Yoichi*; Ichikawa, Shinichi; Maekawa, Fujio; Ikeda, Yujiro
Nuclear Instruments and Methods in Physics Research A, 459(3), p.581 - 585, 2001/03
Times Cited Count：8 Percentile：86.05(Instruments & Instrumentation)no abstracts in English
AmSakama, Minoru*; Tsukada, Kazuaki; Asai, Masato; Ichikawa, Shinichi; Haba, Hiromitsu; Goto, Shinichi*; Oura, Yasuji*; Nishinaka, Ichiro; Nagame, Yuichiro; Shibata, Michihiro*; et al.
European Physical Journal A, 9(3), p.303 - 306, 2000/11
Times Cited Count：17 Percentile：65.82(Physics, Nuclear)no abstracts in English
Asai, Masato; Sakama, Minoru*; Tsukada, Kazuaki; Ichikawa, Shinichi; Haba, Hiromitsu; Nishinaka, Ichiro; Nagame, Yuichiro; Goto, Shinichi*; Kojima, Yasuaki*; Oura, Yasuji*; et al.
AIP Conference Proceedings 561, p.358 - 367, 2000/09
no abstracts in English
Ichikawa, Shinichi; Asai, Masato*; Tsukada, Kazuaki; Nishinaka, Ichiro; Nagame, Yuichiro; Osa, Akihiko; Shibata, Michihiro*; Kawade, Kiyoshi*; Kojima, Yasuaki*; Sakama, Minoru*; et al.
Proceedings of 2nd International Conference on Fission and Neutron-rich Nuclei, p.203 - 205, 2000/03
no abstracts in English
-decay half-lives of new neutron-rich isotopes of elements from Pm to TbIchikawa, Shinichi; Asai, Masato*; Tsukada, Kazuaki; Osa, Akihiko; Sakama, Minoru*; Kojima, Yasuaki*; Shibata, M.*; Nishinaka, Ichiro; Nagame, Yuichiro; Oura, Yasutsugu*; et al.
AIP Conference Proceedings 495, p.103 - 106, 1999/12
no abstracts in English
La isotopesYamamoto, Hiroshi*; Shibata, Michihiro*; Kawade, Kiyoshi*; Kojima, Yasuaki*; Osa, Akihiko; Watanabe, Satoshi; Koizumi, Mitsuo; Sekine, Toshiaki
JAERI-Review 99-025, TIARA Annual Report 1998, p.208 - 210, 1999/10
no abstracts in English
