New isomer found in Sb-51(140)89: Sphericity and shell evolution between N=82 and N=90
- Authors
- Lozeva, R.; Naidja, H.; Nowacki, F.; Dudek, J.; Odahara, A.; Moon, C. -B.; Nishimura, S.; Doornenbal, P.; Daugas, J. -M.; Soederstroem, P. -A.; Sumikama, T.; Lorusso, G.; Wu, J.; Xu, Z. Y.; Baba, H.; Browne, F.; Daido, R.; Fang, Y.; Isobe, T.; Kojouharov, I.; Kurz, N.; Patel, Z.; Rice, S.; Sakurai, H.; Schaffner, H.; Sinclair, L.; Watanabe, H.; Yagi, A.; Yokoyama, R.; Kubo, T.; Inabe, N.; Suzuki, H.; Fukuda, N.; Kameda, D.; Takeda, H.; Ahn, D. S.; Murai, D.; Garrote, F. L. Bello; Didierjean, F.; Ideguchi, E.; Ishigaki, T.; Jung, H. S.; Komatsubara, T.; Kwon, Y. K.; Lee, P.; Lee, C. S.; Morimoto, S.; Niikura, M.; Nishibata, H.; Nishizuka, I.
- Issue Date
- Jan-2016
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW C, v.93, no.1
- Journal Title
- PHYSICAL REVIEW C
- Volume
- 93
- Number
- 1
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/7362
- DOI
- 10.1103/PhysRevC.93.014316
- ISSN
- 2469-9985
2469-9993
- Abstract
- In this article we report on the first spectroscopic information on Sb-140(51)89 and the observation of an isomer in this nucleus with T-1/2 = 41(8) mu s. It is located in close proximity to Sn-140 for N = 90, where the nu f(7/2) orbit is completely filled. The possible origin of the isomeric state is a pi g(7/2)(1) x nu f(7/2)(-1) coupling configuration, resulting in a (6(-)) or (7(-)) spin-parity. This is likely caused by an inversion of the pi g(7/2) and pi d(5/2) orbitals at N = 89. The existence of such an isomer far from stability is discussed extensively in the context of shell-model calculations and compared to results from mean-field calculations performed using a deformed Woods-Saxon potential. Both approaches suggest the observation of a single-particle excitation mode at an extreme neutron number.
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