High-K band in 140Gd

Abstract

High-spin states in the neutron-deficient 140 Gd nucleus have been studied with the 92 Mo( 54 Fe,α2p) reaction at a beam energy of 240 MeV. The level scheme of 140 Gd was considerably extended from what was previously known. In this work we concentrate on one of the 9 bands observed, which presents relatively strong M1 transitions and negligible signature splitting, and has an isomeric band-head, indicating a strongly coupled or high-K configuration. We compare this band to the K π = 8 − bands observed in N=74 isotones and propose a similar configuration assignment, but with a somewhat larger deformation.