High spin structure in 130,131Ba

Abstract

High spin states of, 130,131Ba have been investigated via fusion evaporation reactions 122Sn (13C,4n)131Ba and 122Sn(13C, 5n)130Ba at Ebeam = 65MeV. The level schemes of 130,131Ba have been extended by placing several new γ transitions. A few interband transitions connecting two negative-parity bands, which are the experimental fingerprints of signature partners, have been established in 130Ba. Spin and parity of a side band have been assigned in 131Ba and this dipole band is proposed to have a three-quasiparticle configuration, vh11/2 ⊗ πh11/2⊗ πg7/2. The observed band structures and nuclear shape evolution as a function of the angular momentum have been discussed in the light of Total-Routhian-Surface calculations. © Società Italiana di Fisica/Springer-Verlag 2014.