Supernova Neutrinos as a Precise Probe of Nuclear Neutron Skin

TL;DR

This paper proposes using high-luminosity neutrino flux from a nearby supernova to precisely measure the neutron skin thickness of lead nuclei through coherent elastic neutrino-nucleus scattering, offering a new method in nuclear physics.

Contribution

It introduces a novel approach to determine neutron skin thickness using supernova neutrinos and evaluates the potential of the RES-NOVA detector for this purpose.

Findings

Potential to measure neutron radius of lead with 0.1% precision

Achieves about 0.006 fm accuracy in neutron skin thickness

Feasible if a supernova occurs within 1 kpc from Earth

Abstract

A precise and model-independent determination of the neutron distribution radius $R_{\rm n}$ and thus the neutron skin thickness $R_{\rm skin}$ of atomic nuclei is of fundamental importance in nuclear physics, particle physics and astrophysics but remains a big challenge in terrestrial labs. We argue that the nearby core-collapse supernova (CCSN) in our Galaxy may render a neutrino flux with unprecedentedly high luminosity, offering perfect opportunity to determine the $R_{\rm n}$ and $R_{\rm skin}$ through the coherent elastic neutrino-nucleus scattering (CE$\nu$NS). We evaluate the potential of determining the $R_{\rm n}$ of lead (Pb) via CE$\nu$NS with the nearby CCSN neutrinos in the RES-NOVA project which is designed to hunt CCSN neutrinos using an array of archaeological Pb based cryogenic detectors. We find that an ultimate precision of $\sim 0.1 \%$ for the $R_{\rm n}$ ($\sim 0.006$ fm for the $R_{\rm skin}$) of Pb can be achieved via RES-NOVA in the most optimistic case that the CCSN explosion were to occur at a distance of $\sim 1$ kpc from the Earth.