2021/07/31 by Masayuki Matsuzaki, Shingo Tagami, Masanobu Yahiro
Physics and Astronomy · #nucl-th
paper · pdf · doi:10.1103/physrevc.104.054613
arXiv admin note: substantial text overlap with arXiv:2003.06168
arxiv created 2021/11/17 · arxiv updated 2021/12/22
[Background] We constructed the Kyushu chiral g-matrix and confirmed its reliability at 30 \lesssim E\rm in \lesssim 100 ~MeV and 250 \lesssim E\rm in \lesssim 400~MeV for 12C scattering. Reaction cross section data of 4He scattering are available for some nuclides including 208Pb. PREX II collaboration reported a thick neutron skin for 208Pb. [Purpose] Our purpose is to deduce neutron skin thicknesses of 208Pb and some other nuclides from reaction cross sections calculated in terms of the double folding model with the g-matrix. [Methods] We fold the g-matrix and densities given by mean field calculations. In order to remedy less-constrainedness of the neutron sector, we renormalize densities so as to reproduce the observed cross sections. [Results] We found that a 3.4~% renormalization is necessary for 208Pb. The neutron density obtained from renormalization results in R\rm skin= 0.416±0.146 fm by confronting the precision proton radius. [Conclusions] Our result is consistent with PREX II and therefore supports larger slope parameter L. Results for 40Ca and 124Sn are also consistent with R\rm skin deduced from other experiments. For 116,120Sn the present method gives thicker skins.