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decay of 
= +
isotopes 
Al and 
Si; Understanding Gamow-Teller strength distribution in neutron-rich nucleiAbromeit, B.*; Tripathi, V.*; Crawford, H. L.*; Liddick, S. N.*; Yoshida, Sota*; Utsuno, Yutaka; Bender, P. C.*; Crider, B. P.*; Dungan, R.*; Fallon, P.*; et al.
Physical Review C, 100(1), p.014323_1 - 014323_14, 2019/07
no abstracts in English
Ne by proton knockout reactionsMurray, I.*; MacCormick, M.*; Bazin, D.*; Doornenbal, P.*; Aoi, Nori*; Baba, Hidetada*; Crawford, H. L.*; Fallon, P.*; Li, K.*; Lee, J.*; et al.
Physical Review C, 99(1), p.011302_1 - 011302_7, 2019/01
Percentile：100(Physics, Nuclear)no abstracts in English
state of 
Al; Investigation on the neutron 
excitation across 
in the island of inversionXu, Z. Y.*; Heylen, H.*; Asahi, Koichiro*; Boulay, F.*; Daugas, J. M.*; de Groote, R. P.*; Gins, W.*; Kamalou, O.*; Koszor
s, 
.*; Lykiardopoupou, M.*; et al.
Physics Letters B, 782, p.619 - 626, 2018/07
Percentile：100(Astronomy & Astrophysics)no abstracts in English
-decay properties and Gamow-Teller strength distributions in 
neutron-rich nucleiYoshida, Sota*; Utsuno, Yutaka; Shimizu, Noritaka*; Otsuka, Takaharu*
Physical Review C, 97(5), p.054321_1 - 054321_17, 2018/05
Times Cited Count：1 Percentile：49.68(Physics, Nuclear)no abstracts in English
Sc and development of the 
subshell closureSteppenbeck, D.*; Takeuchi, Satoshi*; Aoi, Nori*; Doornenbal, P.*; Matsushita, Masafumi*; Wang, H.*; Baba, Hidetada*; Go, Shintaro*; Holt, J. D.*; Lee, J.*; et al.
Physical Review C, 96(6), p.064310_1 - 064310_10, 2017/12
Times Cited Count：1 Percentile：72.32(Physics, Nuclear)no abstracts in English
shell; Lifetime measurements in 
ZnQueiser, 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：1 Percentile：100(Physics, Nuclear)no abstracts in English
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：5 Percentile：26.6(Physics, Multidisciplinary)no abstracts in English
shore of the "island of inversion" and the reduced neutron magicity toward 
ODoornenbal, P.*; Scheit, H.*; Takeuchi, Satoshi*; Utsuno, Yutaka; Aoi, Nori*; Li, K.*; Matsushita, Masafumi*; Steppenbeck, D.*; Wang, H.*; Baba, Hidetada*; et al.
Physical Review C, 95(4), p.041301_1 - 041301_5, 2017/04
Times Cited Count：5 Percentile：23.71(Physics, Nuclear)no abstracts in English
decay of 
Si ( = +5, +6) to low-lying core excited states in odd-odd P isotopesTripathi, V.*; Lubna, R. S.*; Abromeit, B.*; Crawford, H. L.*; Liddick, S. N.*; Utsuno, Yutaka; Bender, P. C.*; Crider, B. P.*; Dungan, R.*; Fallon, P.*; et al.
Physical Review C, 95(2), p.024308_1 - 024308_7, 2017/02
Times Cited Count：3 Percentile：39.76(Physics, Nuclear)no abstracts in English
decay of 
CaIwata, Yoritaka*; Shimizu, Noritaka*; Otsuka, Takaharu*; Utsuno, Yutaka; Men
ndez, J.*; Homma, Michio*; Abe, Takashi*
Physical Review Letters, 116(11), p.112502_1 - 112502_6, 2016/03
Times Cited Count：30 Percentile：5.78(Physics, Multidisciplinary)no abstracts in English
NiShimizu, Noritaka*; Utsuno, Yutaka; Futamura, Yasunori*; Sakurai, Tetsuya*; Mizusaki, Takahiro*; Otsuka, Takaharu*
Physics Letters B, 753, p.13 - 17, 2016/02
Times Cited Count：8 Percentile：22.35(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 Ni, which cannot be calculated with direct eigenstate counting. We succeed in reproducing the experimental result that the 
and 
level densities are almost identical in low-energy regions, which cannot be obtained with conventional methods of estimating level densities.
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
Utsuno, Yutaka; Shimizu, Noritaka*; Otsuka, Takaharu*; Ebata, Shuichiro*; Homma, Michio*
Progress in Nuclear Energy, 82, p.102 - 106, 2015/07
Times Cited Count：2 Percentile：66.76(Nuclear Science & Technology)no abstracts in English
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
Ar and the 
=32 subshell closureSteppenbeck, D.*; Takeuchi, Satoshi*; Aoi, Nori*; Doornenbal, P.*; Matsushita, Masafumi*; Wang, H.*; Utsuno, Yutaka; Baba, Hidetada*; Go, Shintaro*; Lee, J.*; et al.
Physical Review Letters, 114(25), p.252501_1 - 252501_6, 2015/06
Times Cited Count：18 Percentile：15.72(Physics, Multidisciplinary)The neutron-rich nucleus Ar is produced by the fragmentation reactions of 
Ca, Sc, and 
Ti at the RIBF facility in RIKEN, and its deexcited 
rays are observed for the first time. The first level in Ar is identified to lie at 1178(18)keV from the most intense -ray spectra. This experimental data, together with the systematics of the levels for surrounding nuclei, is analyzed with large-scale shell-model calculations. Consequently, the 
sub-shell gap in Ar is equivalent to that of 
Ca, thus making the level in Ar higher than that of Ar. The shell-model calculation also predicts that the sub-shell gap enhances in going from Ca to Ar, which will be verified by forthcoming experiments for Ar.
NiChiara, 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：22 Percentile：7.02(Physics, Nuclear)The neutron-rich isotope Ni was produced by multi-nucleon transfer reactions of Zn in the Argonne National Laboratory, and an in-beam -ray experiment were performed using the GRETINA array. The 
and 
levels of Ni were observed for the first time. Those levels are regarded as large deformed states associated with proton excitation from the 
orbit because they cannot be reproduced by a shell-model calculation assuming a small valence space without . 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 
Ni, and confirms the predictive power of the Monte Carlo shell-model calculation.
Togashi, Tomoaki*; Shimizu, Noritaka*; Utsuno, Yutaka; Otsuka, Takaharu*; Homma, Michio*
Physical Review C, 91(2), p.024320_1 - 024320_12, 2015/02
Times Cited Count：11 Percentile：23.61(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 
single-particle level as suggested previously.
-ray emitting radioactive nuclides from the Fukushima Dai-ichi Nuclear Power Plant accidentSaito, Kimiaki; Tanihata, Isao*; Fujiwara, Mamoru; Saito, Takashi*; Shimoura, Susumu*; Otsuka, Takaharu*; Onda, Yuichi*; Hoshi, Masaharu*; Ikeuchi, Yoshihiro*; Takahashi, Fumiaki; et al.
Journal of Environmental Radioactivity, 139, p.308 - 319, 2015/01
Times Cited Count：121 Percentile：0.45(Environmental Sciences)Utsuno, Yutaka; Shimizu, Noritaka*; Otsuka, Takaharu*; Yoshida, Toru*; Tsunoda, Yusuke*
Physical Review Letters, 114(3), p.032501_1 - 032501_5, 2015/01
Times Cited Count：19 Percentile：13.85(Physics, Multidisciplinary)In usual even-even nuclei, 
, 
, 
states are known to be connected via strong 
transitions. The recently observed 
state in the neutron-rich nucleus 
S has a strongly hindered transition to the state. We report the origin of this strong hindrance in this paper. While shell-model calculations reproduce the hindrance, their many-body wave functions are too complicated for one to understand the nature. In this study, we introduce a novel method to obtain wave functions in the intrinsic frame by performing the variation after angular-momentum projection. The , states are dominated by the usual 
state, whereas for the 
level the 
state is lower than state, which causes the hindrance. We also account for similar hindrance in 
S in this framework. The 
level is the lightest-mass high-
isomer ever found.
Ni hole-states from (p,d) transfer reactionsSanetullaev, A.*; Tsang, M. B.*; Lynch, W. G.*; Lee, J.*; Bazin, D.*; Chan, K. P.*; Coupland, D.*; Hanzl, V.*; Hanzlova, D.*; Kilburn, M.*; et al.
Physics Letters B, 736, p.137 - 141, 2014/09
Times Cited Count：6 Percentile：49.44(Astronomy & Astrophysics)no abstracts in English
