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Journal Articles

Thick-restart block Lanczos method for large-scale shell-model calculations

Shimizu, Noritaka*; Mizusaki, Takahiro*; Utsuno, Yutaka; Tsunoda, Yusuke*

Computer Physics Communications, 244, p.372 - 384, 2019/11

 Times Cited Count:44 Percentile:99.23(Computer Science, Interdisciplinary Applications)

no abstracts in English

Journal Articles

Stochastic estimation of nuclear level density in the nuclear shell model; An Application to parity-dependent level density in $$^{58}$$Ni

Shimizu, Noritaka*; Utsuno, Yutaka; Futamura, Yasunori*; Sakurai, Tetsuya*; Mizusaki, Takahiro*; Otsuka, Takaharu*

Physics Letters B, 753, p.13 - 17, 2016/02

AA2015-0661.pdf:0.39MB

 Times Cited Count:16 Percentile:81.37(Astronomy & Astrophysics)

Nuclear level density plays an important role in applications to nuclear energy and nuclear astrophysics, dominating neutron-capture cross sections. In this paper, we propose a new, practical and accurate method of estimating nuclear level density within the framework of the nuclear shell model, and show its feasibility and usefulness. This method is based on the idea that the level density is obtained by the number of eigenstates that is represented as a contour integral in the complex plane. We first confirm the feasibility of this method using a small system in which the exact eigenstates are available, and then calculate parity-dependent level density in $$^{58}$$Ni, which cannot be calculated with direct eigenstate counting. We succeed in reproducing the experimental result that the $$2^+$$ and $$2^-$$ level densities are almost identical in low-energy regions, which cannot be obtained with conventional methods of estimating level densities.

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

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

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

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

Structure of unstable nuclei around N=28 described by a shell model with the monopole-based universal interaction

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

AIP Conference Proceedings 1355, p.161 - 166, 2011/00

 Times Cited Count:0 Percentile:0.05

no abstracts in English

Journal Articles

Novel extrapolation method in the Monte Carlo shell model

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

Physical Review C, 82(6), p.061305_1 - 061305_4, 2010/12

AA2010-0824.pdf:0.34MB

 Times Cited Count:37 Percentile:89.51(Physics, Nuclear)

no abstracts in English

Journal Articles

Shell evolution in the sd-pf shell studied by the shell model

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

AIP Conference Proceedings 1120 (Internet), p.81 - 86, 2009/05

no abstracts in English

Journal Articles

Structure of unstable nuclei in the sd-pf shell region by shell model with proper tensor force

Utsuno, Yutaka; Otsuka, Takaharu*; Mizusaki, Takahiro*; Homma, Michio*

European Physical Journal; Special Topics, 150(1), p.187 - 188, 2007/11

 Times Cited Count:2 Percentile:19.98(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Structure of exotic nuclei in the $$sd-pf$$ shell region and its relation to the effective interaction

Utsuno, Yutaka; Otsuka, Takaharu*; Mizusaki, Takahiro*; Homma, Michio*

Journal of Physics; Conference Series, 49, p.126 - 131, 2006/00

no abstracts in English

Journal Articles

Shape coexistence and mixing in $$N$$$$sim$$20 region

Utsuno, Yutaka; Otsuka, Takaharu*; Mizusaki, Takahiro*; Homma, Michio*

Journal of Physics; Conference Series, 20, p.167 - 168, 2005/00

 Times Cited Count:0 Percentile:0.06

no abstracts in English

Journal Articles

Onset of intruder ground state in exotic Na isotopes and evolution of the $$N=20$$ shell gap

Utsuno, Yutaka; Otsuka, Takaharu*; Glasmacher, T.*; Mizusaki, Takahiro*; Homma, Michio*

Physical Review C, 70(4), p.044307_1 - 044307_8, 2004/10

A2004-0200.pdf:0.17MB

 Times Cited Count:137 Percentile:98.16(Physics, Nuclear)

We perform systematic calculations of nuclear moments and energy levels in neutron-rich Na isotopes with the Monte Carlo shell model by adopting a large model space consisting of the full $$sd$$ and part of the $$pf$$ orbits. The calculation well reproduces those observables. The result shows that the disappearance of the $$N=20$$ magic number starts already at $$N=18$$ and that the magicity completely disappears for the $$N=19$$ isotone $$^{30}$$Na. This is in sharp contrast to previous consensus that the magic number disappears at $$N=20$$ and beyond. This early onset of disappearance indicates that the $$N=20$$ shell gap considerably narrows in Na isotopes compared to stable nuclei near $$^{40}$$Ca.

Journal Articles

First measurement of the quadrupole moment in the 2$$_1^+$$ state of $$^{84}$$Kr

Osa, Akihiko; Czosnyka, T.*; Utsuno, Yutaka; Mizusaki, Takahiro*; Toh, Yosuke; Oshima, Masumi; Koizumi, Mitsuo; Hatsukawa, Yuichi; Katakura, Junichi; Hayakawa, Takehito; et al.

Physics Letters B, 546(1-2), p.48 - 54, 2002/10

 Times Cited Count:10 Percentile:52.26(Astronomy & Astrophysics)

A $$^{84}$$Kr beam was Coulomb-excited on a $$^{98}$$Mo target and a $$^{nat}$$Ta target. Six reduced matrix elements for 5 low-lying states were derived from the analysis using the least-squares code GOSIA. The quadrupole moment of the 2$$_1^+$$ was newly obtained. The measured quadrupole moment and the $$B(E2)$$ values are consistent with large-scale shell-model calculations which give a systematic description of $$N$$,=,50 isotones.

Journal Articles

Structure of ${it N}$$$sim$$20 unstable nuclei studied by the Monte Carlo shell model

Utsuno, Yutaka; Otsuka, Takaharu*; Mizusaki, Takahiro*; Homma, Michio*

JAERI-Conf 2001-012, p.103 - 106, 2001/09

no abstracts in English

Journal Articles

Monte Carlo shell model for atomic nuclei

Otsuka, Takaharu*; Homma, Michio*; Mizusaki, Takahiro*; Shimizu, N.*; Utsuno, Yutaka

Progress in Particle and Nuclear Physics, 47(1), p.319 - 400, 2001/09

 Times Cited Count:247 Percentile:99.23(Physics, Nuclear)

no abstracts in English

Journal Articles

Magic numbers in exotic nuclei and spin-isospin properties of $$NN$$ interaction

Otsuka, Takaharu*; Fujimoto, Rintaro*; Utsuno, Yutaka; Brown, B. A.*; Homma, Michio*; Mizusaki, Takahiro*

Physical Review Letters, 87(8), p.082502_1 - 082502_4, 2001/08

A2001-0048.pdf:0.15MB

 Times Cited Count:605 Percentile:99.48(Physics, Multidisciplinary)

no abstracts in English

47 (Records 1-20 displayed on this page)