Magnetic moments in odd-A Cd isotopes and coupling of particles with zero-point vibrations

TL;DR

This paper investigates how ground-state correlations affect magnetic moments in odd-A Cd isotopes, using an extended quasiparticle-phonon model to better match experimental data and understand nuclear structure.

Contribution

It introduces an extension to the quasiparticle-phonon model that includes quasiparticle-phonon configurations in the ground state, improving the explanation of magnetic moments in Cd isotopes.

Findings

GSC significantly influence magnetic dipole moments.

Extended QPM results deviate from Schmidt values, aligning better with experimental data.

Ground-state correlations help reproduce observed magnetic moments.

Abstract

Background: The coupling of the last nucleon with configurations in the ground state of the even-even core is known to augment the single quasiparticle fragmentation pattern. In a recent experimental study by Yordanov \emph{et al.} the values of the magnetic dipole and electric quadrupole moments of the $11/2^-$ state in a long chain of Cd isotopes were found to follow a simple trend which we try to explain by means of incorporating long-range correlations in the ground state. Purpose: Our purpose is to study the influence of the ground-state correlations (GSC) on the magnetic moments and compare our results with the data for the odd-A Cd isotopes. Method: In order to evaluate if the additional correlations have bearing on the magnetic moments we employ an extension to the quasiparticle-phonon model (QPM) which takes into account quasiparticle$\otimes$phonon configurations in the ground state of the even-even core to the structure of the odd-A nucleus wave function. Results: It is shown that the values for the magnetic moments which the applied QPM extension yields deviate further from the Schmidt values. The latter is in agreement with the measured values for the Cd isotopes. Conclusions: The GSC exert significant influence on the magnetic dipole moments and reveal a potential for reproducing the experimental values for the studied cadmium isotopes.