Abstract
The level structure of 145Pm was studied by methods of in-beam γ-ray and conversion-electron spectroscopy using the 146Nd(p, 2n) 145Pm reaction. Over twenty new levels with spins up to 15 2 were observed. The cluster-vibration model was applied to 145 61Pm 84 under the assumption of the Z = 64 subshell closure. Positive-parity levels are explained very well when the cluster consists of three proton holes in the g 7 2 and d 5 2 shells. Our results strongly support the assumption that the Z = 64 closure persists for Z = 61 promethium nuclei.
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