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論文

Evolution of nuclear structure in the neutron-rich $$^{96,97,99}$$Nb isotopes; Evidence for shape coexistence in $$N$$=58 $$^{99}$$Nb

Kumar, V.*; Chapman, R.*; O'Donnell, D.*; Ollier, J.*; Orlandi, R.; Smith, J. F.*; Spohr, K.-M.*; Torres, D. A.*; 他13名*

Physical Review C, 108(4), p.044313_1 - 044313_19, 2023/10

https://doi.org/10.1103/PhysRevC.108.044313
 被引用回数：1 パーセンタイル：26.66(Physics, Nuclear)

The nuclear structure of neutron-rich niobium isotopes $$^{96,97,98}$$Nb were studied at the Legnaro National Laboratories using $$gamma$$-ray spectroscopy. The isotopes were produced in two different experiments, either using multi-nucleon transfer reactions of $$^{96}$$Zr 530-MeV beam onto a $$^{124}$$Sn target, or via fusion-fission of $$^{36}$$S on $$^{176}$$Yb. The level schemes of these isotopes were extended respectively up to excitation energies of 4545, 5409, and 3814 keV. The structure of the low-lying states in these isotopes was interpreted and discussed in the context of shell-model calculations. In particular, for the $$^{99}$$Nb isotope ($$Z$$=41, $$N$$=58), the results indicate the presence of shape-coexistence at low-energies, which was observed for the first time in this isotope.

論文

Study of medium-spin states of neutron-rich $$^{87,89,91}$$Rb isotopes

Torres, D. A.*; Chapman, R.*; Kumar, V.*; Hadinia, B.*; Hodsdon, A.*; Labiche, M.*; Liang, X.*; O'Donnell, D.*; Ollier, J.*; Orlandi, R.; et al.

European Physical Journal A, 55(9), p.158_1 - 158_21, 2019/09

https://doi.org/10.1140/epja/i2019-12839-6
 被引用回数：1 パーセンタイル：11.42(Physics, Nuclear)

Excited states of the rubidium isotopes $$^{87,89,91}$$Rb were studied at the INFN Legnaro National Laboratory. Measurements of the $$gamma$$-ray of nuclei produced in binary reactions from the interaction of a beam of 530 MeV $$^{96}$$Zr ions with a $$^{124}$$Sn target were complemented by studies of the $$gamma$$-rays from nuclei produced in the interaction of a beam of 230 MeV $$^{36}$$S ions with a thick $$^{176}$$Yb target. The structure of the yrast states of $$^{87, 89, 91}$$Rb is discussed within the context of spherical shell-model and cranked Nilsson-Strutinsky calculations.

論文

Identification of a 6.6$$mu$$s isomeric state in $$^{175}$$Ir

Gillespie, S. A.*; Andreyev, A. N.; Al Monthery, M.*; Barton, C. J.*; Antalic, S.*; Auranen, K.*; Badran, H.*; Cox, D.*; Cubiss, J. G.*; O'Donnell, D.*; et al.

Physical Review C, 99(6), p.064310_1 - 064310_6, 2019/06

https://doi.org/10.1103/PhysRevC.99.064310
 被引用回数：3 パーセンタイル：28.10(Physics, Nuclear)

An experiment has been performed to study excited states in the neutron-deficient nucleus $$^{175}$$Ir via the use of the JUROGAM II high-purity germanium detector array and the RITU gas-filled separator at JYFL, Jyv$"a$skyl$"a$. By using isomer tagging, an isomeric state with a half-life of 6.58(15) $$mu$$s has been observed in $$^{175}$$Ir for the first time. It has been established that the isomer decays via a 45.2 ($$E1$$) - 26.1 ($$M1$$) keV cascade to new states below the previously reported ground state in $$^{175}$$Ir with $$I^{pi} = (5/2^{-})$$. We now reassign this $$(5/2^{-})$$ state to the isomeric state discovered in this study.

論文

Cross-shell excitations near the "island of inversion"; Structure of $$^{30}$$Mg

Daecon, A. N.*; Smith, J. F.*; Freeman, S. J.*; Janssens, R. V. F.*; Carpenter, M. P.*; Hadinia, B.*; Hoffman, C. R.*; Kay, B. P.*; Lauritsen, T.*; Lister, C. J.*; et al.

Physical Review C, 82(3), p.034305_1 - 034305_7, 2010/09

https://doi.org/10.1103/PhysRevC.82.034305
 被引用回数：24 パーセンタイル：77.04(Physics, Nuclear)

$$^{30}$$Mgは、中性子数20の魔法数が消滅する「逆転の島」と呼ばれている領域の境界にあたり、その詳しい核構造は興味が持たれている。この研究では、アルゴンヌ国立研究所において$$^{30}$$Mgの励起状態を$$^{14}$$C($$^{18}$$O,2$$p$$)反応にて生成し、そこからの脱励起$$gamma$$線を観測することによってエネルギー準位を構築した。その結果、励起エネルギー2-4MeV領域に魔法数消滅が起きないことを前提とした理論計算では得られない状態が複数観測された。モンテカルロ殻模型による大規模計算と比較したところ、これらの状態は、2個の中性子が中性子数20の殻ギャップを超えて励起した状態と対応させることができた。すなわち、$$^{30}$$Mgではかなり低い励起エネルギーに殻ギャップを超えた励起状態が存在することが明らかとなり、「逆転の島」の境界に属することがはっきりした。

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