Intrinsic states of deformed N=Z nuclei in a quartet formalism

TL;DR

This paper introduces a quartet-based intrinsic state framework for understanding the band structures of N=Z nuclei, effectively reproducing experimental spectra and configuration interaction results.

Contribution

It presents a novel quartet formalism that simplifies the understanding of band structures in N=Z nuclei, linking intrinsic states to observed spectra.

Findings

Projected states closely match experimental spectra.

Quartet condensates effectively describe intrinsic states.

The approach simplifies understanding of nuclear band structures.

Abstract

The band structure of N=Z nuclei is constructed from intrinsic states defined in terms of quartets. The simplest of these states is a condensate of collective quartets with isospin T=0. The other intrinsic states are built by promoting one quartet of the condensate to an excited T=0 configuration. From these intrinsic states, by angular momentum projection, band structures are generated that approximate well the experimental ones. The projected states also reproduce to a very good extent the spectra resulting from configuration interaction calculations based on the same quartets forming the intrinsic states. These results show that the quartet-based intrinsic states provide the appropriate framework to understand in a simple and intuitive manner the emergence of band-like structures in N=Z nuclei.