Skin values and matter radii of $^{208}$Pb and $^{58,60,64}$Ni based on reaction cross section of $^{3,4}$He scattering

Author:

Shingo Tagami, Tomotsugu Wakasa, Masanobu Yahiro

Keyword:

Nuclear Experiment, Nuclear Experiment (nucl-ex), Nuclear Theory (nucl-th)

journal:

date:

2023-06-15 16:00:00

Abstract

The PREX group reported a new skin value, $r_{\rm skin}^{208}({\rm PREX2}) = 0.283 \pm 0.071{\rm fm}$. Using the chiral (Kyushu) $g$-matrix folding model with the proton and neutron densities determined with D1S+GHFB+AMP, we determined neutron skin thickness $r_{\rm skin}^{208}({\rm exp})$ from reaction cross sections $\sigma_{\rm R}({\rm exp})$ of p+$^{208}$Pb scattering. The method also yielded $r_{\rm skin}^{208}({\rm exp})$ from $\sigma_{\rm R}({\rm exp})$ of $^{4}$He+$^{208}$Pb scattering. We accumulated the 206 EoSs and determined a sloop parameter from the 206 EoSs. The value yields $r_{\rm skin}^{208}=0.102 \sim 0.354~{\rm fm}$. As the first aim, we first determine $r_{\rm skin}^{208}({\rm exp})$ from $\sigma_{\rm R}({\rm exp})$ of $^{3}$He scattering on $^{208}$Pb target and take the weighted mean and its error for $r_{\rm skin}^{208}({\rm PREX2})$, three skin values of p+$^{208}$Pb, $^{3, 4}$He+$^{208}$Pb scattering and the $r_{\rm skin}^{208}$ based on the 206 EoSs. As the second aim, we determine matter radii $r_{m}({\rm exp})$ of $^{58,60,64}$Ni from $\sigma_{\rm R}({\rm exp})$ of $^{3,4}$He scattering on $^{58,60,64}$Ni targets. Our result is $r_{\rm skin}^{208}({\rm exp}) =0.512 \pm 0.268~{\rm fm}$ for $^{3}$He+$^{208}$Pb scattering. Our conclusion is $r_{\rm skin}^{208} =0.285 \pm 0.030~{\rm fm}$. It is determined from the 5 skin values mentioned above.

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