Double-octupole excitations in theN=84 nucleiNd144andSm146

Abstract
Evidence of collective octupole excitations built on spherical shell-model states is reported for the N=84 isotones Sm146 and Nd144. In particular, good candidates for double-octupole excitations, analog to the 12+ state at 3981 keV in Gd148, have been identified in both nuclei.

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