Emerging γ-soft-like spectrum in ¹⁹⁶Pt in the SU3-IBM (I)*

Abstract

Recently, it has been argued that a spherical-like spectrum emerges in the SU3-IBM,
opening up new approaches to understand the γ-softness in realistic nuclei. In a previous paper,
γ-softness with degeneracy of the ground and quasi-γ bands was observed. In this paper, another
special point connected with the middle degenerate point is discussed, which is found to be related
with the properties of 196Pt. This emergent γ-softness has also been shown to be important for
understanding the prolate-oblate asymmetric shape phase transition. The low-lying spectra, B(E2)
values and quadrupole moments in 196Pt are discussed showing that the new model can account
for several observed features. This is the first part of the discussions on the γ-soft-like spectrum of
196Pt.