Spectroscopic Factors in 16O and Nucleon Asymmetry

TL;DR

This paper uses advanced Green's functions methods to analyze how nucleon removal probabilities vary with proton-neutron asymmetry in oxygen and calcium isotopes, providing insights into nuclear structure.

Contribution

It applies the self-consistent Green's functions and FRPA methods to study spectroscopic factors across isotopes with varying asymmetry, highlighting the asymmetry dependence with chiral forces.

Findings

Spectroscopic factors decrease with increasing proton-neutron asymmetry.

Results align qualitatively with heavy-ion knockout experiments.

Asymmetry dependence is weaker than in experimental observations.

Abstract

The self-consistent Green's functions method is employed to study the spectroscopic factors of quasiparticle states around 16O, 28O, 40Ca and 60Ca. The Faddeev random phase approximation (FRPA) is used to account for the coupling of particles with collective excitation modes. Results for 16O are reviewed first. The same approach is applied to isotopes with large proton-neutron asymmetry to estimate its effect on spectroscopic factors. The results, based on the chiral N3LO force, exhibit an asymmetry dependence similar to that observed in heavy-ion knockout experiments but weaker in magnitude.