Tidal Waves -- a non-adiabatic microscopic description of the yrast states in near-spherical nuclei

TL;DR

This paper introduces a microscopic model describing yrast states in near-spherical nuclei as surface quadrupole waves, calculating energies and transition probabilities with a cranking model that accounts for shape and single-particle interactions.

Contribution

It presents a novel microscopic non-adiabatic approach to describe yrast states as tidal waves, incorporating nonlinear nucleonic responses and shape-single particle coupling.

Findings

Accurately calculates energies and E2 transition probabilities for specific nuclei.

Demonstrates strong coupling between shape and single-particle degrees of freedom.

Provides a new microscopic framework for near-spherical nuclear states.

Abstract

The yrast states of nuclei that are spherical or weakly deformed in their ground states are described as quadrupole waves running over the nuclear surface, which we call "tidal waves". The energies and E2 transition probabilities of the yrast states in nuclides with $Z$= 44, 46, 48 and $N=56, ~58,..., 66$ are calculated by means of the cranking model in a microscopic way. The nonlinear response of the nucleonic orbitals results in a strong coupling between shape and single particle degrees of freedom.