Abstract
Members of an h9/2 band are identified by using known reaction data in conjunction with precise measurements of gamma -ray and conversion electron properties on doubly-mass-separated 149Eu and singly-mass-separated 149Pm. Similar bands in N=87 nuclei with Z=56-66 (143Ba, 145Ce, 147Nd, 151Gd and 153Dy, respectively) are shown to have properties consistent with the h9/2 particle intruder bands in heavier odd-proton nuclei. When the properties of the N=87 nuclei are compared. The authors show that, as expected, the particle f72/N and h9/2 bands have less collectivity and increase in energy as the Z=64 subshell closure is approached. This trend is shown to be opposite to the decrease in energy of the known intruder S1/2, d3/2 and h11/2 states. Such opposing trends can be accounted for if the properties of the underlying even-even core nuclei are taken into account. These systematic properties are used to suggest the occurrence of small ground-state deformation in both 143Ba and 145Ce.
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