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JAEA Reports

Interim activity status report of "the group for investigation of reasonable safety assurance based on graded approach" (from September, 2019 to September, 2020)

Yonomoto, Taisuke; Nakashima, Hiroshi*; Sono, Hiroki; Kishimoto, Katsumi; Izawa, Kazuhiko; Kinase, Masami; Osa, Akihiko; Ogawa, Kazuhiko; Horiguchi, Hironori; Inoi, Hiroyuki; et al.

JAEA-Review 2020-056, 51 Pages, 2021/03

JAEA-Review-2020-056.pdf:3.26MB

A group named as "The group for investigation of reasonable safety assurance based on graded approach", which consists of about 10 staffs from Sector of Nuclear Science Research, Safety and Nuclear Security Administration Department, departments for management of nuclear facility, Sector of Nuclear Safety Research and Emergency Preparedness, aims to realize effective graded approach (GA) about management of facilities and regulatory compliance of JAEA. The group started its activities in September, 2019 and has had discussions through 10 meetings and email communications. In the meetings, basic ideas of GA, status of compliance with new regulatory standards at each facility, new inspection system, etc were discussed, while individual investigation at each facility were shared among the members. This report is compiled with expectation that it will help promote rational and effective safety management based on GA by sharing contents of the activity widely inside and outside JAEA.

Journal Articles

Cross-shell excitations from the $$fp$$ shell; Lifetime measurements in $$^{61}$$Zn

Queiser, M.*; Vogt, A.*; Seidlitz, M.*; Reiter, P.*; Togashi, Tomoaki*; Shimizu, Noritaka*; Utsuno, Yutaka; Otsuka, Takaharu*; Homma, Michio*; Petkov, P.*; et al.

Physical Review C, 96(4), p.044313_1 - 044313_13, 2017/10

 Times Cited Count:3 Percentile:36.02(Physics, Nuclear)

no abstracts in English

Journal Articles

Monte Carlo shell model studies with massively parallel supercomputers

Shimizu, Noritaka*; Abe, Takashi*; Homma, Michio*; Otsuka, Takaharu*; Togashi, Tomoaki*; Tsunoda, Yusuke*; Utsuno, Yutaka; Yoshida, Toru*

Physica Scripta, 92(6), p.063001_1 - 063001_19, 2017/06

 Times Cited Count:16 Percentile:79.57(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Large-scale shell-model analysis of the neutrinoless $$betabeta$$ decay of $$^{48}$$Ca

Iwata, Yoritaka*; Shimizu, Noritaka*; Otsuka, Takaharu*; Utsuno, Yutaka; Men$'e$ndez, J.*; Homma, Michio*; Abe, Takashi*

Physical Review Letters, 116(11), p.112502_1 - 112502_6, 2016/03

AA2015-0865.pdf:0.45MB

 Times Cited Count:57 Percentile:94.42(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

2016 Professional Engineer (PE) test preparation course "Nuclear and Radiation Technical Disciplines"

Takahashi, Naoki; Yoshinaka, Kazuyuki; Harada, Akio; Yamanaka, Atsushi; Ueno, Takashi; Kurihara, Ryoichi; Suzuki, Soju; Takamatsu, Misao; Maeda, Shigetaka; Iseki, Atsushi; et al.

Nihon Genshiryoku Gakkai Homu Peji (Internet), 64 Pages, 2016/00

no abstracts in English

Journal Articles

Large-scale shell-model studies for exotic nuclei; Probing shell evolution

Utsuno, Yutaka; Otsuka, Takaharu*; Shimizu, Noritaka*; Tsunoda, Yusuke*; Homma, Michio*; Abe, Takashi*; Mizusaki, Takahiro*; Togashi, Tomoaki*; Brown, B. A.*

Proceedings of International Conference on Nuclear Theory in the Supercomputing Era 2014 (NTSE 2014), p.29 - 34, 2016/00

no abstracts in English

Journal Articles

Series studies on inter-comparison of radiation calibration fields and calibration techniques between KAERI and JAEA

Yoshitomi, Hiroshi; Tanimura, Yoshihiko*; Tatebe, Yosuke; Tsutsumi, Masahiro; Kawasaki, Katsuya; Kowatari, Munehiko; Yoshizawa, Michio; Shimizu, Shigeru*; Kim, J.-S.*; Lee, J.-G.*; et al.

Proceedings of 4th Asian and Oceanic Congress on Radiation Protection (AOCRP-4) (CD-ROM), 4 Pages, 2015/07

Journal Articles

Photonuclear reactions of calcium isotopes calculated with the nuclear shell model

Utsuno, Yutaka; Shimizu, Noritaka*; Otsuka, Takaharu*; Ebata, Shuichiro*; Homma, Michio*

Progress in Nuclear Energy, 82, p.102 - 106, 2015/07

 Times Cited Count:3 Percentile:32.14(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Recent advances in shell evolution with shell-model calculations

Utsuno, Yutaka; Otsuka, Takaharu*; Tsunoda, Yusuke*; Shimizu, Noritaka*; Homma, Michio*; Togashi, Tomoaki*; Mizusaki, Takahiro*

JPS Conference Proceedings (Internet), 6, p.010007_1 - 010007_8, 2015/06

no abstracts in English

Journal Articles

Identification of deformed intruder states in semi-magic $$^{70}$$Ni

Chiara, C. J.*; Weisshaar, D.*; Janssens, R. V. F.*; Tsunoda, Yusuke*; Otsuka, Takaharu*; Harker, J. L.*; Walters, W. B.*; Recchia, F.*; Albers, M.*; Alcorta, M.*; et al.

Physical Review C, 91(4), p.044309_1 - 044309_10, 2015/04

 Times Cited Count:30 Percentile:90.56(Physics, Nuclear)

The neutron-rich isotope $$^{70}$$Ni was produced by multi-nucleon transfer reactions of $$^{70}$$Zn in the Argonne National Laboratory, and an in-beam $$gamma$$-ray experiment were performed using the GRETINA array. The $$2^+_2$$ and $$4^+_2$$ levels of $$^{70}$$Ni were observed for the first time. Those levels are regarded as large deformed states associated with proton excitation from the $$f_{7/2}$$ orbit because they cannot be reproduced by a shell-model calculation assuming a small valence space without $$f_{7/2}$$. A theoretical analysis based on the Monte Carlo shell model published in 2014 indicates that those levels corresponds to a prolate deformed band. The present result demonstrates the occurrence of shape coexistence in neutron-rich Ni isotopes other than a known case of $$^{68}$$Ni, and confirms the predictive power of the Monte Carlo shell-model calculation.

Journal Articles

Large-scale shell-model calculations for unnatural-parity high-spin states in neutron-rich Cr and Fe isotopes

Togashi, Tomoaki*; Shimizu, Noritaka*; Utsuno, Yutaka; Otsuka, Takaharu*; Homma, Michio*

Physical Review C, 91(2), p.024320_1 - 024320_12, 2015/02

AA2014-0602.pdf:2.08MB

 Times Cited Count:18 Percentile:81.47(Physics, Nuclear)

We perform large-scale shell-model calculations for unnatural-parity high-spin states in neutron-rich Cr and Fe isotopes with $$N$$ = 31-35. The excitation energies of the $$9/2^+_1$$ states for those odd-mass nuclei sharply decrease with the neutron number, which attracts much interest. In this study, we calculate those unnatural-parity states systematically using an effective interaction comprised of existing ones plus minimal modifications. The calculated energy levels excellently agree with experimental data. The deformations of those isotopes are analysed by using the wave functions obtained by the shell-model calculations. We show that prolate deformation dominates this region, contrary to the previous suggestion based on the $$9/2^+_1$$ isomeric level. It is demonstrated that the sharp decrease of the $$9/2^+_1$$ levels occurs due to the rising of the Fermi surface, but not due to the evolution of the $$g_{9/2}$$ single-particle level as suggested previously.

Journal Articles

Recent shell-model results for exotic nuclei

Utsuno, Yutaka; Otsuka, Takaharu*; Shimizu, Noritaka*; Homma, Michio*; Mizusaki, Takahiro*; Tsunoda, Yusuke*; Abe, Takashi*

EPJ Web of Conferences, 66, p.02106_1 - 02106_8, 2014/03

 Times Cited Count:12 Percentile:96.87

no abstracts in English

Journal Articles

Novel shape evolution in exotic Ni isotopes and configuration-dependent shell structure

Tsunoda, Yusuke*; Otsuka, Takaharu*; Shimizu, Noritaka*; Homma, Michio*; Utsuno, Yutaka

Physical Review C, 89(3), p.031301_1 - 031301_5, 2014/03

AA2013-0908.pdf:2.19MB

 Times Cited Count:126 Percentile:99.38(Physics, Nuclear)

no abstracts in English

Journal Articles

Shape coexistence in $$^{68}$$Ni

Suchyta, S.*; Liddick, S. N.*; Tsunoda, Yusuke*; Otsuka, Takaharu*; Bennett, M. B.*; Chemey, A.*; Homma, Michio*; Larson, N.*; Prokop, C. J.*; Quinn, S. J.*; et al.

Physical Review C, 89(2), p.021301_1 - 021301_5, 2014/02

 Times Cited Count:69 Percentile:97.68(Physics, Nuclear)

no abstracts in English

JAEA Reports

Survey of radiation protection creiteria following the accident at the Fukushima Dai-ichi Nuclear Power Plant

Yamada, Katsunori; Fujii, Katsutoshi; Kanda, Hiroshi; Higashi, Daisuke; Kobayashi, Toshiaki; Nakagawa, Masahiro; Fukami, Tomoyo; Yoshida, Keisuke; Ueno, Yumi; Nakajima, Junya; et al.

JAEA-Review 2013-033, 51 Pages, 2013/12

JAEA-Review-2013-033.pdf:2.73MB

After the accident at Fukushima Dai-ichi Nuclear Power Plant, various numerical criteria relevant to radiation protection were defined. We surveyed these criteria through internet. As a result of survey, the following 13 items were identified: (1) criteria for taking stable iodine tablets, (2) criteria for the screening of surface contamination, (3) evacuation area, sheltering area, etc., (4) activity concentrations in food, drinking water, etc., (5) dose limit for radiation workers engaged in emergency work, (6) guideline levels of radioactive substances in bathing areas, (7) criteria for use of school buildings and schoolyards, (8) restriction on planting rice, (9) acceptable activity concentrations in feedstuff, (10) acceptable activity concentrations in compost, (11) criteria for export containers and ships, (12) criteria for contaminated waste, (13) standards for radiation workers engaged in decontamination work. In this report, the basis of and issues on these criteria are summarized.

Journal Articles

Shape transitions in exotic Si and S isotopes and tensor-force-driven Jahn-Teller effect

Utsuno, Yutaka; Otsuka, Takaharu*; Brown, B. A.*; Homma, Michio*; Mizusaki, Takahiro*; Shimizu, Noritaka*

Physical Review C, 86(5), p.051301_1 - 051301_6, 2012/11

AA2012-0664.pdf:0.63MB

 Times Cited Count:107 Percentile:98.12(Physics, Nuclear)

no abstracts in English

Journal Articles

Shell evolution around and beyond $$N$$=28 studied with large-scale shell-model calculations

Utsuno, Yutaka; Otsuka, Takaharu*; Brown, B. A.*; Homma, Michio*; Mizusaki, Takahiro*; Shimizu, Noritaka*

Progress of Theoretical Physics Supplement, (196), p.304 - 309, 2012/10

no abstracts in English

Journal Articles

Variational procedure for nuclear shell-model calculations and energy-variance extrapolation

Shimizu, Noritaka*; Utsuno, Yutaka; Mizusaki, Takahiro*; Homma, Michio*; Tsunoda, Yusuke*; Otsuka, Takaharu*

Physical Review C, 85(5), p.054301_1 - 054301_6, 2012/05

AA2012-0118.pdf:1.01MB

 Times Cited Count:17 Percentile:70.56(Physics, Nuclear)

no abstracts in English

Journal Articles

New-generation of Monte Carlo shell model for the K computer era

Shimizu, Noritaka*; Abe, Takashi*; Tsunoda, Yusuke*; Utsuno, Yutaka; Yoshida, Toru*; Mizusaki, Takahiro*; Homma, Michio*; Otsuka, Takaharu*

Progress of Theoretical and Experimental Physics (Internet), 2012(1), p.01A205_1 - 01A205_27, 2012/00

AA2012-0119.pdf:1.74MB

 Times Cited Count:97 Percentile:95.81(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Status of breakup reaction theory

Ogata, Kazuyuki*; Matsumoto, Takuma*; Hashimoto, Shintaro; Minomo, Kosho*; Egami, Tomoaki*; Iseri, Yasunori*; Kono, Michio*; Chiba, Satoshi; Bertulani, C. A.*; Shimizu, Yoshifumi*; et al.

Journal of Physics; Conference Series, 312, p.082008_1 - 082008_10, 2011/09

 Times Cited Count:1 Percentile:48.7

Recent studies on breakup reactions with the continuum-discretized coupled channels method are reviewed. The topics covered are: four-body breakup processes for $$^6$$He induced reaction, dynamical relativistic effects on coulomb breakup, microscopic description of projectile breakup processes, description of ternary processes (new triple-$$alpha$$ reaction rate) and new approach to inclusive breakup processes.

64 (Records 1-20 displayed on this page)