JOPSS - Search Results

Search Results: Records 1-20 displayed on this page of 64

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Journal Articles

Cross-shell excitations from the 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

https://doi.org/10.1103/PhysRevC.96.044313

Times Cited Count：5 Percentile：37.82(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

https://doi.org/10.1088/1402-4896/aa65e4

Times Cited Count：24 Percentile：81.98(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

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

Iwata, Yoritaka*; Shimizu, Noritaka*; Otsuka, Takaharu*; Utsuno, Yutaka; Menndez, J.*; Homma, Michio*; Abe, Takashi*

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

AA2015-0865.pdf:0.45MB

https://doi.org/10.1103/PhysRevLett.116.112502

Times Cited Count：74 Percentile：94.65(Physics, Multidisciplinary)

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

http://ntse.khb.ru/files/uploads/2014/proceedings/Utsuno.pdf

no abstracts in English

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

https://doi.org/10.1016/j.pnucene.2014.07.036

Times Cited Count：4 Percentile：27.63(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

https://doi.org/10.7566/JPSCP.6.010007

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

https://doi.org/10.1103/PhysRevC.91.044309

Times Cited Count：36 Percentile：91.42(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 -ray experiment were performed using the GRETINA array. The and 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

https://doi.org/10.1103/PhysRevC.91.024320

Times Cited Count：21 Percentile：79.94(Physics, Nuclear)

We perform large-scale shell-model calculations for unnatural-parity high-spin states in neutron-rich Cr and Fe isotopes with = 31-35. The excitation energies of the 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 isomeric level. It is demonstrated that the sharp decrease of the 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

https://doi.org/10.1051/epjconf/20146602106

Times Cited Count：14 Percentile：96.68

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

https://doi.org/10.1103/PhysRevC.89.031301

Times Cited Count：142 Percentile：99.34(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

https://doi.org/10.1103/PhysRevC.89.021301

Times Cited Count：75 Percentile：97.53(Physics, Nuclear)

no abstracts in English

Journal Articles

Evidence for a new nuclear "magic number" from the level structure of $^{54}$ Ca

Steppenbeck, D.*; Takeuchi, Satoshi*; Aoi, Nori*; Doornenbal, P.*; Matsushita, Masafumi*; Wang, H.*; Baba, Hidetada*; Fukuda, Naoki*; Go, Shintaro*; Homma, Michio*; et al.

Nature, 502(7470), p.207 - 210, 2013/10

https://doi.org/10.1038/nature12522

Times Cited Count：269 Percentile：99.79(Multidisciplinary Sciences)

no abstracts in English

Journal Articles

Dipole strength distributions in $^{56}$ Fe

Shizuma, Toshiyuki; Hayakawa, Takehito; Ogaki, Hideaki; Toyokawa, Hiroyuki*; Komatsubara, Tetsuro*; Kikuzawa, Nobuhiro; Inakura, Tsunenori*; Homma, Michio*; Nakada, Hitoshi*

Physical Review C, 87(2), p.024301_1 - 024301_7, 2013/02

https://doi.org/10.1103/PhysRevC.87.024301

Times Cited Count：15 Percentile：69.68(Physics, Nuclear)

Electro-magnetic dipole transitions in $^{56}$ Fe were measured in photon scattering experiments with a linearly polarized photon beam. The parity quantum numbers of the excited dipole states were determined by the intensity asymmetry of resonantly scattered -rays with respect to the polarization plane of the incident photon beam. While the summed magnetic dipole () strength was determined as at excitation energies between 7 and 10 MeV, the summed electric dipole () strength below 10 MeV was obtained as $Sigma B(E1)!uparrow=78.0(15)times10^{-3},e^2{rm fm}^2$ . The observed strength was compared with shell-model predictions in the -shell using the GXPF1J and KB3G effective interactions. In addition, the strength was compared with random-phase approximation calculations with the Skyrme interaction.

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

https://doi.org/10.1103/PhysRevC.86.051301

Times Cited Count：127 Percentile：98.38(Physics, Nuclear)

no abstracts in English

Journal Articles

Shell evolution around and beyond =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

https://doi.org/10.1143/PTPS.196.304

no abstracts in English

Journal Articles

Spectroscopic study of $^{63}$ Ni via cold neutron capture reaction, 1; Nuclear structure of $^{63}$ Ni

Oshima, Masumi; Kin, Tadahiro*; Nakamura, Shoji; Homma, Michio*; Minato, Futoshi; Hayakawa, Takehito; Hara, Kaoru; Kimura, Atsushi; Koizumi, Mitsuo; Harada, Hideo; et al.

Journal of the Physical Society of Japan, 81(8), p.084201_1 - 084201_15, 2012/08

https://doi.org/10.1143/JPSJ.81.084201

Times Cited Count：2 Percentile：19.81(Physics, Multidisciplinary)

The -radiation has been investigated produced by cold neutron capture in an enriched $^{62}$ Ni sample. The 315 -rays have been placed in the $^{63}$ Ni level scheme of which 272 placements are new. We have determined excitation energies with 0.2-0.8 keV error and branching ratios of 62 bound levels in $^{63}$ Ni, including 30 new levels. The Q-value of the $^{62}$ Ni (n,) $^{63}$ Ni reaction amounts to 6837.75 (18) keV. A large-scale shell-model calculation has been performed and the energies of the low-lying $^{63}$ Ni states are successfully reproduced. A mean-field statistical model calculation has been also made by using a self-consistent interaction between the Hartree-Fock + BCS method and the statistical calculation. The calculation result is consistent with the experimental level density of $^{63}$ Ni.