# Neutron Skin and Giant Resonances in Nuclei

## TL;DR

This paper reviews methods for determining neutron skin thickness from giant resonances, critiques existing proposals, and explains the relation between symmetry energy and neutron skin.

## Contribution

It critically evaluates current methods for extracting neutron skin and provides a simple explanation of the symmetry energy's relation to neutron skin.

## Key findings

- Energy difference between GTR and IAS is insensitive to neutron skin
- Existing proposals for extracting neutron skin are critically reviewed
- Linear relation between symmetry energy and neutron skin explained

## Abstract

Some aspects, both experimental and theoretical, of extracting the neutron skin $\Delta R$ from properties of isovector giant resonances are discussed. Existing proposals are critically reviewed. The method relying on the energy difference between the GTR and IAS is shown to lack sensitivity to $\Delta R$. A simple explanation of the linear relation between the symmetry energy and the neutron skin is also given.