Core screening effect in knockout reactions

TL;DR

This paper introduces a core screening effect model to explain the suppression of spectroscopic factors in knockout reactions, accounting for the hindrance of removing strongly bound nucleons and reducing isospin dependence.

Contribution

The study presents a density-dependent suppression model for single-particle wave functions that explains quenching phenomena in knockout reactions.

Findings

Core screening reduces isospin dependence of quenching factors

Model aligns with experimental observations of spectroscopic factor suppression

Provides a new perspective on nuclear reaction mechanisms

Abstract

The systematic quenching of spectroscopic factors in terms of separation energy asymmetry in single-nucleon knockout reactions remains a puzzle. We propose a core screening effect to consider the hindrance when strongly bound nucleons in the projectile nucleus are removed by the heavy-ion target. The core screening effect is simulated as a density dependent suppression of single-particle wave functions inside the core of projectile. Our study shows that the parameterized core screening effect can significantly reduce the isospin dependence of quenching factors, offering insights into nuclear reaction mechanisms.