Abstract
The structure of semi-magic was investigated following complementary multinucleon-transfer and secondary fragmentation reactions. Changes to the higher-spin, presumed negative-parity states based on observed -ray coincidence relationships result in better agreement with shell-model calculations using effective interactions in the neutron model space. The second and states, however, can only be successfully described when proton excitations across the shell gap are included. Monte Carlo shell-model calculations suggest that the latter two states are part of a prolate-deformed intruder sequence, establishing an instance of shape coexistence at low excitation energies similar to that observed recently in neighboring .
2 More- Received 14 January 2015
DOI:https://doi.org/10.1103/PhysRevC.91.044309
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