Cross correlation of low-lying levels of even-even nuclei

TL;DR

This paper investigates the cross correlations of low-lying energy levels in even-even nuclei, revealing patterns linked to critical dynamical symmetries and the interacting Boson model.

Contribution

It introduces an analysis of cross correlation patterns of nuclear energy levels across different excitation-energy ratios, highlighting symmetry-related minima.

Findings

Deep minima at R_{4/2}=2.2 and 2.9 in correlation coefficients

Distinct correlation patterns for different R_{4/2} classes

Correlation patterns linked to dynamical symmetries

Abstract

We consider the cross correlations of low-lying energy levels of nuclei belonging to small intervals of the excitation-energy ratio R_{4/2} of the first 4^+ to 2^+ states. The mean value of the cross-correlation coefficients, plotted as a function of R_{4/2} has deep minima at values of R_{4/2}=2.2 and 2.9, which correspond to the critical dynamical symmetries of the interacting Boson model. The distribution of the calculated coefficients for nuclei belonging to different R_{4/2} classes has different pattern.