Microscopic description of oblate-prolate shape mixing in proton-rich Se isotopes

TL;DR

This paper uses a microscopic method to analyze shape coexistence and mixing in proton-rich selenium isotopes, revealing how rotational energy influences shape localization and spectra.

Contribution

It introduces a fully microscopic approach using the ASCC method to describe large-amplitude shape vibrations and coexisting rotational bands in Se isotopes.

Findings

Reproduces properties of coexisting rotational bands

Shows shape mixing weakens with increasing angular momentum

Highlights rotational energy's role in wave function localization

Abstract

The oblate-prolate shape coexisting/mixing phenomena in proton-rich 68,70,72Se are investigated by means of the adiabatic self-consistent collective coordinate (ASCC) method. The one-dimensional collective path and the collective Hamiltonian describing the large-amplitude shape vibration are derived in a fully microscopic way. The excitation spectra, B(E2) and spectroscopic quadrupole moments are calculated by requantizing the collective Hamiltonian and solving the collective Schroedinger equation. The basic properties of the coexisting two rotational bands in low-lying states of these nuclei are well reproduced. It is found that the oblate-prolate shape mixing becomes weak as the rotational angular momentum increases. We point out that the rotational energy plays a crucial role in causing the localization of the collective wave function in the (beta,gamma) deformation space.