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Revised spin-parity assignment and a new interpretation of the high-spin isomer in 151Er |
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| Authors: | T. Fukuchi T. Hori T. Masue K. Tajiri A. Sato T. Furukawa A. Odahara T. Shimoda Y. Wakabayashi Y. Gono T. Suzuki M. Ukai T. Wakui A. Yamazaki Y. Miyashita N. Sato M. Tateoka M. Ohguma T. Shinozuka T. Koike K. Shirotori Y. Miura S. Kinoshita Y. Ma Y. Y. Fu H. Tamura |
| Affiliation: | 1. Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043, Toyonaka, Japan 2. RIKEN, Hirosawa 2-1, Saitama 351-0198, Wako, Japan 3. Center for Nuclear Study, University of Tokyo, Hirosawa 2-1, Saitama 351-0198, Wako, Japan 4. Cyclotron and Radio-isotope Center, Tohoku University, Aoba 6-3, Sendai, 980-8578, Aobaku, Japan 5. Department of Physics, Tohoku University, Aoba 6-3, Sendai, 980-8578, Aobaku, Japan |
| Abstract: | The high-spin isomer in 151Er ( E x = 10.3 MeV, T 1/2 = 420 ns) has been studied by the 116Sn ( 40Ar , 5n) 151Er reaction at 197MeV. From the $ gamma gamma$ coincidence relations, a new transition with an energy of 1514keV was found. This finding requires the revision of the spin-parity assignment from previous 67/2- to 61/2+ or 65/2- . The 61/2+ assignment is the one which was predicted by the deformed independent particle model as an isomer with a large oblate deformation ( $ beta$ = - 0.17) of the $ensuremath[nu(f_{7/2}h_{9/2} i_{13/2}) pi(h^4_{11/2})]_{61/2^+}$ configuration. The isomerism may be attributed to the sudden shape change of the isomer from the nearly spherical shape of the lower-spin yrast states to the oblate shape. |
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