Elsevier

Nuclear Physics A

Volume 342, Issue 3, 30 June 1980, Pages 421-436
Nuclear Physics A

In-beam study of 145Pm and the cluster-vibration model for odd Pm nuclei

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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 to152 were observed. The cluster-vibration model was applied to 14561Pm84 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 g72 and d52 shells. Our results strongly support the assumption that the Z = 64 closure persists for Z = 61 promethium nuclei.

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1

We thank M. Luontama and A. Passoja for helping in conversion-electron measurements and J. Simanainen for preparing the self-supporting targets. Financial support from the Academy of Finland is gratefully acknowledge. One of us (M.K.) is also thankful to the Emil Aaltonen Foundation for a grant.

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