High-spin isomer and level structure of 145Sm

A. Odahara, Y. Gono, S. Mitarai, T. Morikawa, T. Shizuma, M. Kidera, M. Shibata, T. Kishida, E. Ideguchi, K. Morita, A. Yoshida, H. Kumagai, Y. H. Zhang, A. Ferragut, T. Murakami, M. Oshima, H. Iimura, S. Hamada, H. Kusakari, M. SugawaraM. Ogawa, M. Nakajima, B. J. Min, J. C. Kim, S. J. Chae, H. Sagawa

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High-spin states of 145Sm were studied by using the reactions 20Ne(136Xe,α7n), 16O(136Xe,7n), 139La(10B,4n) and 138Ba(13C,6n). The level scheme was extended up to the state at 14.6 MeV. The excitation energy and the spin-parity of the 0.96 μs high-spin isomer were determined to be 8.8 MeV and (49/2+), respectively. Experimental results were discussed comparing with the deformed independent particle model calculation. High-spin isomers observed in N = 83 isotones were interpreted to be caused by the sudden shape change from near spherical to oblate. The Z = 64 shell gap energy was found to decrease from 2.4 to 2.0 MeV as the proton number decreases from Z = 64 to 61.

Original languageEnglish
Pages (from-to)363-384
Number of pages22
JournalNuclear Physics A
Issue number3
Publication statusPublished - Jul 14 1997
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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