High-spin isomer and level structure of 145Sm

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 (...

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Published in:Nuclear physics. A 1997-07, Vol.620 (3), p.363-384
Main Authors: Odahara, A., Gono, Y., Mitarai, S., Morikawa, T., Shizuma, T., Kidera, M., Shibata, M., Kishida, T., Ideguchi, E., Morita, K., Yoshida, A., Kumagai, H., Zhang, Y.H., Ferragut, A., Murakami, T., Oshima, M., Iimura, H., Hamada, S., Kusakari, H., Sugawara, M., Ogawa, M., Nakajima, M., Min, B.J., Kim, J.C., Chae, S.J., Sagawa, H.
Format: Article
Language:English
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Nuclear reactions
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Summary: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.
ISSN:0375-9474
DOI:10.1016/S0375-9474(97)00189-9