Shape mixing dynamics in the low-lying states of proton-rich Kr isotopes

TL;DR

This paper investigates the shape mixing dynamics in low-lying states of proton-rich Kr isotopes using a microscopically derived five-dimensional quadrupole collective Hamiltonian, highlighting the role of large-amplitude vibrations and rotational effects.

Contribution

It introduces a new microscopic derivation of the collective Hamiltonian based on CHFB and QRPA methods for studying shape mixing in Kr isotopes.

Findings

Large-amplitude collective vibrations significantly influence shape mixing.

Rotational effects alter the oblate-prolate shape dynamics.

The method provides detailed insights into low-lying state structures.

Abstract

We study the oblate-prolate shape mixing in the low-lying states of proton-rich Kr isotopes using the five-dimensional quadrupole collective Hamiltonian. The collective Hamiltonian is derived microscopically by means of the CHFB (constrained Hartree-Fock-Bogoliubov) + Local QRPA (quasiparticle random phase approximation) method, which we have developed recently on the basis of the adiabatic self-consistent collective coordinate method. The results of the numerical calculation show the importance of large-amplitude collective vibrations in the triaxial shape degree of freedom and rotational effects on the oblate-prolate shape mixing dynamics in the low-lying states of these isotopes.