New features of shape coexistence in Sm152

P. E. Garrett, W. D. Kulp, J. L. Wood, D. Bandyopadhyay, S. Choudry, D. Dashdorj, S. R. Lesher, M. T. McEllistrem, M. Mynk, J. N. Orce, S. W. Yates

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54 Scopus citations

Abstract

Excited states in Sm152 have been investigated with the Sm152(n,n′γ) reaction. The lowest four negative-parity band structures have been characterized in detail with respect to their absolute decay properties. Specifically, a new Kπ=0- band has been assigned with its 1- band head at 1681keV. This newly observed band has a remarkable similarity in its E1 transition rates for decay to the first excited Kπ=0+ band at 684keV to the lowest Kπ=0- band and its decay to the ground-state band. Based on these decay properties, as well as energy considerations, this new band is assigned as a Kπ=0- octupole excitation based on the Kπ=02+ state. An emerging pattern of repeating excitations built on the 02+ level similar to those built on the groundstate may indicate that Sm152 is a complex example of shape coexistence rather than a critical point nucleus.

Original languageEnglish
Article number062501
JournalPhysical Review Letters
Volume103
Issue number6
DOIs
StatePublished - Aug 5 2009

ASJC Scopus subject areas

  • General Physics and Astronomy

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