Shape changes and large-amplitude collective dynamics in neutron-rich Cr isotopes

TL;DR

This paper investigates shape-phase transitions in neutron-rich Cr isotopes around N=40 using a collective Hamiltonian approach, successfully reproducing experimental spectra and describing shape evolution.

Contribution

It introduces a detailed collective Hamiltonian model with time-odd mean field components for large-amplitude vibrations in Cr isotopes, improving understanding of shape transitions.

Findings

Excellent agreement with experimental spectra

Describes gradual shape change from spherical to deformed

Accurately models inertial functions and collective dynamics

Abstract

Shape-phase transition in neutron-rich Cr isotopes around N=40 is investigated by employing the collective Hamiltonian approach. The inertial functions for large-amplitude vibration and rotation are evaluated by the local normal modes along the axial quadrupole collective coordinate using the Skyrme and pairing energy density functionals. The time-odd components of the mean fields are fully included in the derived masses. The low-lying spectra obtained by requantizing the collective Hamiltonian show an excellent agreement with the recent experimental data. Gradual change from spherical to axially deformed shapes in between N=34 and 38 is well described.