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Journal Articles

Low-energy electric and magnetic dipole excitations in $$^{166}$$Er

Shizuma, Toshiyuki*; Omer, M.; Hajima, Ryoichi*; Koizumi, Mitsuo; Takahashi, Tone; Tsunoda, Yusuke*; Otsuka, Takaharu*

Physical Review C, 113(4), p.044325_1 - 044325_9, 2026/04

https://doi.org/10.1103/zwx8-fpdh
 Times Cited Count：0

Journal Articles

Prevailing triaxial shapes in atomic nuclei and a quantum theory of rotation of composite objects

Otsuka, Takaharu*; Tsunoda, Yusuke*; Shimizu, Noritaka*; Utsuno, Yutaka; Abe, Takashi*; Ueno, Hideki*

European Physical Journal A, 61(5), p.126_1 - 126_45, 2025/05

https://doi.org/10.1140/epja/s10050-025-01553-1
 Times Cited Count：17 Percentile：99.13(Physics, Nuclear)

no abstracts in English

Journal Articles

First observation of $$^{28}$$O

Kondo, Yosuke*; Achouri, N. L.*; Al Falou, H.*; Atar, L.*; Aumann, T.*; Baba, Hidetada*; Boretzky, K.*; Caesar, C.*; Calvet, D.*; Chae, H.*; et al.

Nature, 620(7976), p.965 - 970, 2023/08

https://doi.org/10.1038/s41586-023-06352-6
 Times Cited Count：51 Percentile：95.45(Multidisciplinary Sciences)

no abstracts in English

Journal Articles

Shape transition of Nd and Sm isotopes and the neutrinoless double-$$beta$$-decay nuclear matrix element of $$^{150}$$Nd

Tsunoda, Yusuke*; Shimizu, Noritaka*; Otsuka, Takaharu*

Physical Review C, 108(2), p.L021302_1 - L021302_6, 2023/08

https://doi.org/10.1103/PhysRevC.108.L021302
 Times Cited Count：12 Percentile：81.72(Physics, Nuclear)

no abstracts in English

Journal Articles

Intruder configurations in $$^{29}$$Ne at the transition into the island of inversion; Detailed structure study of $$^{28}$$Ne

Wang, H.*; Yasuda, Masahiro*; Kondo, Yosuke*; Nakamura, Takashi*; Tostevin, J. A.*; Ogata, Kazuyuki*; Otsuka, Takaharu*; Poves, A.*; Shimizu, Noritaka*; Yoshida, Kazuki; et al.

Physics Letters B, 843, p.138038_1 - 138038_9, 2023/08

https://doi.org/10.1016/j.physletb.2023.138038
 Times Cited Count：8 Percentile：71.26(Astronomy & Astrophysics)

Detailed $$gamma$$-ray spectroscopy of the exotic neon isotope $$^{28}$$Ne has been performed using the one-neutron removal reaction from $$^{29}$$Ne. Based on an analysis of parallel momentum distributions, a level scheme with spin-parity assignments has been constructed for $$^{28}$$Ne and the negative-parity states are identified for the first time. The measured partial cross sections and momentum distributions reveal a significant intruder p-wave strength providing evidence of the breakdown of the N = 20 and N = 28 shell gaps. Only a weak, possible f-wave strength was observed to bound final states. Large-scale shell-model calculations with different effective interactions do not reproduce the large p-wave and small f-wave strength observed experimentally, indicating an ongoing challenge for a complete theoretical description of the transition into the island of inversion along the Ne isotopic chain.

Journal Articles

Level structures of $$^{56,58}$$Ca cast doubt on a doubly magic $$^{60}$$Ca

Chen, S.*; Browne, F.*; Doornenbal, P.*; Lee, J.*; Obertelli, A.*; Tsunoda, Yusuke*; Otsuka, Takaharu*; Chazono, Yoshiki*; Hagen, G.*; Holt, J. D.*; et al.

Physics Letters B, 843, p.138025_1 - 138025_7, 2023/08

https://doi.org/10.1016/j.physletb.2023.138025
 Times Cited Count：18 Percentile：92.48(Astronomy & Astrophysics)

Gamma decays were observed in $$^{56}$$Ca and $$^{58}$$Ca following quasi-free one-proton knockout reactions from $$^{57,59}$$Sc. For $$^{56}$$Ca, a $$gamma$$ ray transition was measured to be 1456(12) keV, while for $$^{58}$$Ca an indication for a transition was observed at 1115(34) keV. Both transitions were tentatively assigned as the $$2^{+}_{1} rightarrow 0^{+}_{gs}$$ decays. A shell-model calculation in a wide model space with a marginally modified effective nucleon-nucleon interaction depicts excellent agreement with experiment for $$2^{+}_{1}$$ level energies, two-neutron separation energies, and reaction cross sections, corroborating the formation of a new nuclear shell above the N = 34 shell. Its constituents, the $$0_{f5/2}$$ and $$0_{g9/2}$$ orbitals, are almost degenerate. This degeneracy precludes the possibility for a doubly magic $$^{60}$$Ca and potentially drives the dripline of Ca isotopes to $$^{70}$$Ca or even beyond.

Journal Articles

First spectroscopic study of odd-odd $$^{78}$$Cu

Pedersen, L. G.*; Sahin, E.*; G$"o$rgen, A.*; Bello Garrote, F. L.*; Tsunoda, Yusuke*; Otsuka, Takaharu*; Niikura, Megumi*; Orlandi, R.; 59 of others*

Physical Review C, 107(4), p.044301_1 - 044301_10, 2023/04

https://doi.org/10.1103/PhysRevC.107.044301
 Times Cited Count：3 Percentile：42.66(Physics, Nuclear)

Journal Articles

$$alpha$$-clustering in atomic nuclei from first principles with statistical learning and the Hoyle state character

Otsuka, Takaharu; Abe, Takashi*; Yoshida, Toru*; Tsunoda, Yusuke*; Shimizu, Noritaka*; Itagaki, Naoyuki*; Utsuno, Yutaka; Vary, J. P.*; Maris, P.*; Ueno, Hideki*

Nature Communications (Internet), 13, p.2234_1 - 2234_10, 2022/04

AA2021-0861.pdf:3.07MB

https://doi.org/10.1038/s41467-022-29582-0
 Times Cited Count：80 Percentile：98.23(Multidisciplinary Sciences)

no abstracts in English

Journal Articles

Emerging concepts in nuclear structure based on the shell model

Otsuka, Takaharu*

Physics (Internet), 4(1), p.258 - 285, 2022/02

https://doi.org/10.3390/physics4010018

no abstracts in English

Journal Articles

Moments and radii of exotic Na and Mg isotopes

Otsuka, Takaharu*; Shimizu, Noritaka*; Tsunoda, Yusuke*

Physical Review C, 105(1), p.014319_1 - 014319_8, 2022/01

https://doi.org/10.1103/PhysRevC.105.014319
 Times Cited Count：13 Percentile：81.18(Physics, Nuclear)

no abstracts in English

Journal Articles

Ground-state properties of light $$4n$$ self-conjugate nuclei in ${it ab initio}$ no-core Monte Carlo shell model calculations with nonlocal $$NN$$ interactions

Abe, Takashi*; Maris, P.*; Otsuka, Takaharu*; Shimizu, Noritaka*; Utsuno, Yutaka; Vary, J. P.*

Physical Review C, 104(5), p.054315_1 - 054315_22, 2021/11

https://doi.org/10.1103/PhysRevC.104.054315
 Times Cited Count：13 Percentile：76.05(Physics, Nuclear)

no abstracts in English

Journal Articles

First spectroscopic study of $$^{51}$$Ar by the ($$p$$,2$$p$$) reaction

Juh$'a$sz, M. M.*; Elekes, Z.*; Sohler, D.*; Utsuno, Yutaka; Yoshida, Kazuki; Otsuka, Takaharu*; Ogata, Kazuyuki*; Doornenbal, P.*; Obertelli, A.*; Baba, Hidetada*; et al.

Physics Letters B, 814, p.136108_1 - 136108_8, 2021/03

AA2020-0747.pdf:0.83MB

https://doi.org/10.1016/j.physletb.2021.136108
 Times Cited Count：8 Percentile：60.62(Astronomy & Astrophysics)

The nuclear structure of $$^{51}$$Ar was studied by the ($$p$$,2$$p$$) reaction using $$gamma$$-ray spectroscopy for the bound and unbound states. Comparing the results to our shell-model calculations, two bound and six unbound states were established. The low cross sections populating the two bound states of $$^{51}$$Ar could be interpreted as a clear signature for the presence of significant sub-shell closures at neutron numbers 32 and 34 in argon isotopes.

Journal Articles

Variational approach with the superposition of the symmetry-restored quasiparticle vacua for nuclear shell-model calculations

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

Physical Review C, 103(1), p.014312_1 - 014312_11, 2021/01

AA2020-0764.pdf:0.89MB

https://doi.org/10.1103/PhysRevC.103.014312
 Times Cited Count：32 Percentile：93.39(Physics, Nuclear)

no abstracts in English

Journal Articles

The Impact of nuclear shape on the emergence of the neutron dripline

Tsunoda, Naofumi*; Otsuka, Takaharu; Takayanagi, Kazuo*; Shimizu, Noritaka*; Suzuki, Toshio*; Utsuno, Yutaka; Yoshida, Sota*; Ueno, Hideki*

Nature, 587, p.66 - 71, 2020/11

https://doi.org/10.1038/s41586-020-2848-x
 Times Cited Count：87 Percentile：95.74(Multidisciplinary Sciences)

no abstracts in English

Journal Articles

$$beta$$ decay of $$^{75}$$Ni and the systematics of the low-lying level structure of neutron-rich odd-$$A$$ Cu isotopes

Bello Garrote, F. L.*; Sahin, E.*; Tsunoda, Yusuke*; Otsuka, Takaharu*; G$"o$rgen, A.*; Orlandi, R.; 61 of others*

Physical Review C, 102(3), p.034314_1 - 034314_13, 2020/09

https://doi.org/10.1103/PhysRevC.102.034314
 Times Cited Count：5 Percentile：38.80(Physics, Nuclear)

Journal Articles

Restoration of the natural $$E(1/2^+_1)-E(3/2^+_1)$$ energy splitting in odd-K isotopes towards $$N=40$$

Sun, Y. L.*; Obertelli, A.*; Doornenbal, P.*; Barbieri, C.*; Chazono, Yoshiki*; Duguet, T.*; Liu, H. N.*; Navr$'a$til, P.*; Nowacki, F.*; Ogata, Kazuyuki*; et al.

Physics Letters B, 802, p.135215_1 - 135215_7, 2020/03

https://doi.org/10.1016/j.physletb.2020.135215
 Times Cited Count：38 Percentile：94.26(Astronomy & Astrophysics)

no abstracts in English

Journal Articles

Evolution of shell structure in exotic nuclei

Otsuka, Takaharu*; Gade, A.*; Sorlin, O.*; Suzuki, Toshio*; Utsuno, Yutaka

Reviews of Modern Physics, 92(1), p.015002_1 - 015002_52, 2020/03

AA2019-0511.pdf:5.43MB

https://doi.org/10.1103/RevModPhys.92.015002
 Times Cited Count：369 Percentile：96.62(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Quasifree neutron knockout from $$^{54}$$Ca corroborates arising $$N=34$$ neutron magic number

Chen, S.*; Lee, J.*; Doornenbal, P.*; Obertelli, A.*; Barbieri, C.*; Chazono, Yoshiki*; Navr$'a$til, P.*; Ogata, Kazuyuki*; Otsuka, Takaharu*; Raimondi, F.*; et al.

Physical Review Letters, 123(14), p.142501_1 - 142501_7, 2019/10

AA2019-0306.pdf:0.57MB

https://doi.org/10.1103/PhysRevLett.123.142501
 Times Cited Count：72 Percentile：93.16(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

$$beta^-$$ decay of $$T_z$$ = +$$frac{11}{2}$$ isotopes $$^{37}$$Al and $$^{39}$$Si; Understanding Gamow-Teller strength distribution in neutron-rich nuclei

Abromeit, 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

AA2019-0227.pdf:1.54MB

https://doi.org/10.1103/PhysRevC.100.014323
 Times Cited Count：2 Percentile：18.52(Physics, Nuclear)

no abstracts in English

Journal Articles

Spectroscopy of strongly deformed $$^{32}$$Ne by proton knockout reactions

Murray, 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

AA2018-0517.pdf:0.8MB

https://doi.org/10.1103/PhysRevC.99.011302
 Times Cited Count：21 Percentile：82.66(Physics, Nuclear)

no abstracts in English

143 (Records 1-20 displayed on this page)