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Journal Articles

Sodium-cooled Fast Reactors

Ohshima, Hiroyuki; Morishita, Masaki*; Aizawa, Kosuke; Ando, Masanori; Ashida, Takashi; Chikazawa, Yoshitaka; Doda, Norihiro; Enuma, Yasuhiro; Ezure, Toshiki; Fukano, Yoshitaka; et al.

Sodium-cooled Fast Reactors; JSME Series in Thermal and Nuclear Power Generation, Vol.3, 631 Pages, 2022/07

https://shop.elsevier.com/books/sodium-cooled-fast-reactors/morishita/978-0-12-824076-2

This book is a collection of the past experience of design, construction, and operation of two reactors, the latest knowledge and technology for SFR designs, and the future prospects of SFR development in Japan. It is intended to provide the perspective and the relevant knowledge to enable readers to become more familiar with SFR technology.

Journal Articles

Insights into the proton transfer mechanism of a bilin reductase PcyA following neutron crystallography

Unno, Masayoshi*; Ishikawa, Kumiko*; Kusaka, Katsuhiro*; Tamada, Taro; Hagiwara, Yoshinori*; Sugishima, Masakazu*; Wada, Kei*; Yamada, Taro*; Tomoyori, Katsuaki; Hosoya, Takaaki*; et al.

Journal of the American Chemical Society, 137(16), p.5452 - 5460, 2015/04

https://doi.org/10.1021/jacs.5b00645
 Times Cited Count：28 Percentile：64.39(Chemistry, Multidisciplinary)

Phycocyanobilin, a light-harvesting and photoreceptor pigment in higher plants, algae, and cyanobacteria, is synthesized from biliverdin IX$$alpha$$ (BV) by phycocyanobilin:ferredoxin oxidoreductase (PcyA) via two steps of two-proton-coupled two-electron reduction. We determined the neutron structure of PcyA from cyanobacteria complexed with BV, revealing the exact location of the hydrogen atoms involved in catalysis. Notably, approximately half of the BV bound to PcyA was BVH$$^{+}$$, a state in which all four pyrrole nitrogen atoms were protonated. The protonation states of BV complemented the protonation of adjacent Asp105. The "axial "water molecule that interacts with the neutral pyrrole nitrogen of the A-ring was identified. His88 N$$delta$$ was protonated to form a hydrogen bond with the lactam O atom of the BV A-ring. His88 and His74 were linked by hydrogen bonds via H$$_{3}$$O$$^{+}$$. These results imply that Asp105, His88, and the axial water molecule contribute to proton transfer during PcyA catalysis.

Journal Articles

Anharmonic Pr guest modes in Pr(Os$$_{1-x}$$Ru$$_x$$)$$_4$$Sb$$_{12}$$ investigated by inelastic X-ray scattering

Tsutsui, Satoshi; Kaneko, Koji; Miyazaki, Ryoichi*; Higashinaka, Ryuji*; Aoki, Yuji*; Kobayashi, Riki*; Wakimoto, Shuichi; Baron, A. Q. R.*; Sugawara, Hitoshi*; Sato, Hideyuki*

JPS Conference Proceedings (Internet), 3, p.011060_1 - 011060_5, 2014/06

https://doi.org/10.7566/JPSCP.3.011060

Journal Articles

Ground-state configuration of the $$N=157$$ nucleus $$^{259}$$No

Asai, Masato; Tsukada, Kazuaki; Sakama, Minoru*; Haba, Hiromitsu*; Ichikawa, Takatoshi*; Ishii, Yasuo; Toyoshima, Atsushi; Ishii, Tetsuro; Nishinaka, Ichiro; Nagame, Yuichiro; et al.

Physical Review C, 87(1), p.014332_1 - 014332_6, 2013/01

https://doi.org/10.1103/PhysRevC.87.014332
 Times Cited Count：6 Percentile：43.66(Physics, Nuclear)

The spin-parity and neutron configuration of the ground state of $$^{259}$$No have been identified through $$alpha$$-decay spectroscopy. The $$^{259}$$No is the nucleus with the largest neutron number whose spin-parities and single-particle configurations have ever been identified. The neutron 9/2$$^{+}$$[615] configuration was assigned to the ground state of $$^{259}$$No as well as to the 231.4 keV level in $$^{255}$$Fm. This allowed us to establish energy spacings and order of the neutron single-particle orbitals in such heaviest nuclear region. The appearance of the 9/2$$^{+}$$[615] ground state at $$N$$=157 implies that the order of the neutron orbitals between the $$N$$=152 and 162 deformed shell gaps should change considerably with increasing neutron number.

Journal Articles

Neutron one-quasiparticle states in $$^{251}$$Fm$$_{151}$$ populated via the $$alpha$$ decay of $$^{255}$$No

Asai, Masato; Tsukada, Kazuaki; Haba, Hiromitsu*; Ishii, Yasuo; Ichikawa, Takatoshi*; Toyoshima, Atsushi; Ishii, Tetsuro; Nagame, Yuichiro; Nishinaka, Ichiro; Kojima, Yasuaki*; et al.

Physical Review C, 83(1), p.014315_1 - 014315_12, 2011/01

https://doi.org/10.1103/PhysRevC.83.014315
 Times Cited Count：24 Percentile：79.14(Physics, Nuclear)

Excited states in $$^{251}$$Fm populated via the $$alpha$$ decay of $$^{255}$$No are studied in detail through $$alpha$$-$$gamma$$ coincidence and $$alpha$$ fine structure measurements. Spin-parities and neutron configurations of the excited states in $$^{251}$$Fm as well as the ground state of $$^{255}$$No are definitely identified on the basis of deduced internal conversion coefficients, lifetimes of $$gamma$$ transitions, rotational-band energies built on one-quasiparticle states, and hindrance factors of $$alpha$$ transitions. It is found that the excitation energy of the 1/2$$^{+}$$[620] state in $$N$$=151 isotones increases with the atomic number, especially at $$Z$$$$ge$$100, while that of the 1/2$$^{+}$$[631] state decreases at $$Z$$=100. Energy systematics of the one-quasiparticle states in the $$N$$=151 isotones are discussed in terms of the evolution of nuclear deformation involving the hexadecapole and hexacontatetrapole deformations.

Journal Articles

$$Q_{beta}$$ measurements of $$^{158,159}$$Pm, $$^{159,161}$$Sm, $$^{160-165}$$Eu, $$^{163}$$Gd and $$^{166}$$Tb using a total absorption BGO detector

Hayashi, Hiroaki*; Akita, Yukinori*; Suematsu, Osamu*; Shibata, Michihiro*; Asai, Masato; Sato, Tetsuya; Ichikawa, Shinichi; Nishinaka, Ichiro; Nagame, Yuichiro; Osa, Akihiko; et al.

European Physical Journal A, 34(4), p.363 - 370, 2007/12

https://doi.org/10.1140/epja/i2006-10522-9
 Times Cited Count：16 Percentile：71.35(Physics, Nuclear)

$$Q_{beta}$$ values of $$^{160-165}$$Eu and $$^{163}$$Gd were measured for the first time using a total absorption BGO detector, and the data of $$^{158,159}$$Pm, $$^{159,161}$$Sm, and $$^{166}$$Tb obtained previously were reanalyzed. These nuclei were produced by the proton-induced fission of $$^{238}$$U at the JAEA-Tokai tandem accelerator facility, and separated from the reaction products using an on-line isotope separator. The deduced mass excesses and two-neutron separation energies were compared with those of atomic mass evaluations and theoretical predictions.

Journal Articles

$$alpha$$ decay of $$^{238}$$Cm and the new isotope $$^{237}$$Cm

Asai, Masato; Tsukada, Kazuaki; Ichikawa, Shinichi; Sakama, Minoru*; Haba, Hiromitsu*; Nishinaka, Ichiro; Nagame, Yuichiro; Goto, Shinichi*; Kojima, Yasuaki*; Oura, Yasuji*; et al.

Physical Review C, 73(6), p.067301_1 - 067301_4, 2006/06

https://doi.org/10.1103/PhysRevC.73.067301
 Times Cited Count：21 Percentile：76.1(Physics, Nuclear)

no abstracts in English

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

https://doi.org/10.1140/epja/i2004-10096-6
 Times Cited Count：16 Percentile：71.27(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

https://doi.org/10.1140/epja/i2004-10044-6
 Times Cited Count：9 Percentile：51.36(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

https://doi.org/10.1103/PhysRevC.69.014308
 Times Cited Count：21 Percentile：73.68(Physics, Nuclear)

no abstracts in English

Journal Articles

$$gamma$$-ray spectroscopy for neutron-rich A$$approx$$160-170 nuclei; The $$beta^{-}$$ decay of $$^{159}$$Pm, $$^{160-162}$$Sm, $$^{162}$$Eu, $$^{164-166}$$Gd, and $$^{166-168}$$Tb

Asai, Masato; Ichikawa, Shinichi; Tsukada, Kazuaki; Osa, Akihiko; Nishinaka, Ichiro; Nagame, Yuichiro; Kojima, Yasuaki*; Shibata, Michihiro*

Fission and Properties of Neutron-Rich Nuclei; Proceedings of 3rd International Conference, p.227 - 232, 2003/10

Structure of neutron-rich A$$approx$$160-170 nuclei produced in the proton-induced fission has been studied through $$gamma$$-ray spectroscopy using an on-line isotope separator. $$beta^{-}$$ decays of $$^{159}$$Pm, $$^{161,162}$$Sm, and $$^{165,166}$$Gd have been observed for the first time, and their half-lives were determined. Excited states of their daughter nuclei were revealed. $$gamma$$ rays following the $$beta^{-}$$ decay of $$^{162}$$Eu and $$^{164}$$Gd have been also observed. The results suggest that the ground state of $$^{162}$$Eu would have a spin 5 or 6.

Journal Articles

Identification of the new isotope $$^{241}$$Bk

Asai, Masato; Tsukada, Kazuaki; Ichikawa, Shinichi; Sakama, Minoru*; Haba, Hiromitsu*; Nagame, Yuichiro; Nishinaka, Ichiro; Akiyama, Kazuhiko; Toyoshima, Atsushi; Kaneko, Tetsuya*; et al.

European Physical Journal A, 16(1), p.17 - 19, 2003/01

https://doi.org/10.1140/epja/i2002-10112-y
 Times Cited Count：8 Percentile：50.24(Physics, Nuclear)

The new isotope $$^{241}$$Bk has been identified for the first time using a gas-jet coupled on-line isotope separator at the JAERI tandem accelerator facility. Characteristic X rays and three $$gamma$$ transitions associated with the EC decay of $$^{241}$$Bk have been observed, and the half-life was determined to be 4.6 min. The half-life value and the observed $$gamma$$-ray energies and intensities can be consistently explained as a consequence of the allowed EC transition of $$pi 7/2^{+}[633]$$ $$rightarrow$$ $$nu 7/2^{+}[624]$$.

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

http://www.tandfonline.com/doi/abs/10.1080/00223131.2002.10875403

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

http://wwwndc.jaea.go.jp/nd2001/proc/pdf/1_0474.pdf

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

https://doi.org/10.14494/jnrs2000.3.187

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

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

https://doi.org/10.1007/s100500070013
 Times Cited Count：17 Percentile：66.14(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

https://doi.org/10.1063/1.1372812

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

https://doi.org/10.1063/1.1301749

no abstracts in English

Journal Articles

Recent studies of unstable nuclei far from stability with the on-line isotope separators of JAERI

Sekine, Toshiaki; Ichikawa, Shinichi; Osa, Akihiko; Koizumi, Mitsuo; Iimura, Hideki; Tsukada, Kazuaki; Nishinaka, Ichiro; Hatsukawa, Yuichi; Nagame, Yuichiro; Asai, Masato*; et al.

Journal of Radioanalytical and Nuclear Chemistry, 239(1), p.127 - 131, 1999/00

https://doi.org/10.1007/BF02349543
 Times Cited Count：2 Percentile：21.17(Chemistry, Analytical)

no abstracts in English

29 (Records 1-20 displayed on this page)