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Journal Articles

Precise intensity measurements in the $$^{14}$$N(n,$$gamma$$)$$^{15}$$N reaction as a $$gamma$$-ray intensity standard up to 11 MeV

Miyazaki, 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:5 Percentile:37.69(Nuclear Science & Technology)

The intensities of the prompt $$gamma$$ rays from the $$^{14}$$N(n,$$gamma$$)$$^{15}$$N reaction have been precisely measured. As the samples, a liquid nitrogen target and a deuterated melamine (C$$_{3}$$D$$_{6}$$N$$_{6}$$) 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 $$gamma$$-ray energy.

Journal Articles

Minor actinide neutron capture cross-section measurements with a 4$$pi$$ Ge spectrometer

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:45.27(Instruments & Instrumentation)

In order to measure the neutron capture cross section of minor actinides, we have proposed the use of a 4$$pi$$ 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$$pi$$ Ge spectrometer is in progress. We are also developing a new data acquisition system based on a digital processing technique.

JAEA Reports

Measurements of Prompt Gamma-Ray Emission Probabilities for Determinations of Neutron Capture Cross Sections of Long Life Nuclides

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 from$$^{14}$$N(n, gamma)$$^{15}$$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 from$$^{14}$$N(n, gamma)$$^{15}$$N reaction were determined with 0.2-0.9% errors. For ten nuclides,$$^{23}$$Na,$$^{27}$$Al,$$^{51V,sup}$$55 Mn,$$^{64}$$Ni,$$^{65}$$Cu,$$^{141}$$Pr,$$^{186}$$W, and$$^{197Au,}$$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$$^{104}$$Pd (n, gamma)$$^{105}$$Pd reaction at thermal energy was measured. Considering transmutation of the nuclide, the cross section of$$^{104}$$Pd(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.

Journal Articles

Proton-neutron configurations in $$^{236g,m}$$Am and its EC-decay daughter $$^{236}$$Pu

Asai, 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:12 Percentile:65.45(Physics, Nuclear)

The EC decay of $$^{236}$$Am has been studied through $$gamma$$-ray spectroscopy. Two EC-decaying states have been found in $$^{236}$$Am with half-lives of 3.6 min and 2.9 min. In $$^{236}$$Pu, we have found the $$K^{pi}=0^{-}$$ octupole band and two-quasiparticle states one of which is a $$K$$ isomer with a 1.2 $$mu$$s half-life. The EC transitions from $$^{236g,m}$$Am to the two-quasiparticle states in $$^{236}$$Pu show small $$log ft$$ values of 4.8--5.3, which allowed us to assign proton-neutron configurations of $$^{236g,m}$$Am and the two-quasiparticle states.

Journal Articles

EC and $$alpha$$ decays of $$^{235}$$Am

Asai, 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:8 Percentile:49.41(Physics, Nuclear)

EC and $$alpha$$ decays of $$^{235}$$Am have been studied by means of $$gamma$$-ray spectroscopy. Excited states in $$^{235}$$Pu have been established for the first time, and tentative spin-parity and Nilsson assignments were given to these levels. The ground state of $$^{235}$$Am was evaluated to be the $$pi 5/2^{-}[523]$$ state from the experimental results. It was found that the $$pi 5/2^{-}[523]$$ state in $$^{231}$$Np is located at $$<$$15~keV, which allowed us to determine the $$Q_{alpha}$$ value of $$^{235}$$Am as 6569$$^{+27}_{-12}$$~keV, in combination with the measured $$alpha$$-particle energy.

Journal Articles

$$alpha$$-decays of neutron-deficient americium isotopes

Sakama, 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:19 Percentile:72.76(Physics, Nuclear)

no abstracts in English

Journal Articles

The Development of Melamine-D for the Precise Measurement of Detection Efficiencies of High Energy $$gamma$$-rays

Nakamura, Shoji; Takayama, Hirokazu*; Kawade, Kiyoshi*; Harada, Hideo

JAERI-Conf 2003-006, p.237 - 240, 2003/06

None

Journal Articles

Nuclear decay properties of the neutron-deficient actinides

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

Journal Articles

Measurements of EC and weak $$alpha$$ decays of neutron-deficient transuranium isotopes

Asai, 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 $$leq$$10 min have been produced with the tandem accelerator, and their EC and weak $$alpha$$ decays have been successfully measured through an on-line isotope separation. Decay schemes of $$^{235,236}$$Am have been established, and proton-neutron configurations in the parent and daughter nuclei have been determined. Observed $$alpha$$ transitions in $$^{233,235}$$Am were found to be the favored transitions between the $$pi 5/2^{-}[523]$$ Nilsson states. Information on nuclear structure, deformation, and atomic masses in this region were obtained.

Journal Articles

Decay studies of neutron-deficient Am, Cm, and Bk nuclei using an on-line isotope separator

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 $$alpha$$ decays of neutron-deficient americium, curium, and berkelium nuclei have been studied using the JAERI on-line isotope separator. Decay schemes of $$^{235, 236}$$Am have been established for the first time, and proton-neutron configurations in $$^{235, 236}$$Am and $$^{235, 236}$$Pu have been determined. $$alpha$$ transitions observed in $$^{233, 235}$$Am were found to be the favored transitions between the $$pi 5/2^{-}[523]$$ Nilsson states. $$Q_{alpha}$$ values of $$^{237, 238}$$Cm have been determined. Nuclear structure, deformation, and atomic masses for these nuclei were discussed.

Journal Articles

Q$$_{beta}$$ determination of neutron-rich isotope $$^{144}$$La with a total absorption detector

Shibata, 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:50.89(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Performance of the multiple target He/PbI$$_{2}$$ aerosol jet system for mass separation of neutron-deficient actinide isotopes

Ichikawa, 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:13 Percentile:65.26(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Normalization of $$gamma$$-$$gamma$$ angular correlation coincidence counts using characteristic X-rays

Asai, 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:2 Percentile:21.52(Instruments & Instrumentation)

no abstracts in English

JAEA Reports

Activation cross section measurement at neutron energy from 13.3 to 14.9MeV using FNS facility

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

Journal Articles

Application of a total absorption detector to Q$$_{beta}$$ determination without the knowledge of the decay scheme

Shibata, 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:87.21(Instruments & Instrumentation)

no abstracts in English

Journal Articles

New isotope $$^{233}$$Am

Sakama, 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:15 Percentile:64.03(Physics, Nuclear)

no abstracts in English

Journal Articles

Spectroscopic studies of mass-separated heavy nuclei

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

Journal Articles

Decay studies of neutron-rich isotopes produced in proton-induced fission of actinides

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

Journal Articles

$$beta$$-decay half-lives of new neutron-rich isotopes of elements from Pm to Tb

Ichikawa, 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

Journal Articles

Systematics of the atomic masses of $$^{124-130}$$La isotopes

Yamamoto, 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

52 (Records 1-20 displayed on this page)