Multiple quantum phase transitions in the Zr isotopes

TL;DR

This paper analyzes the spectra of Zr isotopes using the interacting boson model, revealing multiple quantum phase transitions involving configuration crossings and shape changes.

Contribution

It provides a detailed theoretical study of quantum phase transitions in Zr isotopes with configuration mixing, highlighting complex interplay of different transition types.

Findings

Identification of abrupt configuration crossings.

Observation of gradual shape changes within configurations.

Evidence of multiple quantum phase transitions in Zr isotopes.

Abstract

We present a detailed analysis of spectra and other observables for the entire chain of Zr isotopes, from neutron number 52 to 70, in the framework of the interacting boson model with configuration mixing. The results suggest a remarkable interplay of multiple quantum phase transitions (QPTs). One type of QPT involves an abrupt crossing of normal and intruder configurations, superimposed on a second type of QPT involving gradual shape-changes within each configuration.