[Prex] Neutron skin in 48Ca determined from p+48Ca and 48Ca+12C scattering

[Jay Benesch]

I'm surprised they don't include the CREX result from the DNP meeting.  

https://arxiv.org/abs/2201.08541

Neutron skin in 48Ca determined from p+48Ca and 48Ca+12C scattering
Shingo Tagami, Tomotsugu Wakasa, Maya Takechi, Jun Matsui, Masanobu Yahiro

    In our previous paper, we determined r208skin(exp)=0.278±0.035~fm from σR for p+208Pb scattering, using the Kyushu (chiral) g-matrix folding model with the densities calculated with D1S-GHFB with the angular momentum projection (AMP). The value agrees with that of PREX2. Reaction cross sections σR are available for p+48Ca scattering, whereas interaction cross sections σI are available for 48Ca + 12C scattering. As for 48Ca, the high-resolution E1 polarizability experiment (E1pE) yields r48skin(E1pE)=0.14∼0.20 fm. We determine r48skin(exp) from the data on σR for p+48Ca scattering and from the data on σI for 48Ca+12C scattering. We use the Kyushu g-matrix folding model with the densities calculated with the D1M-GHFB+AMP densities. The D1M-GHFB+AMP proton and neutron densities are scaled so as to reproduce the data under the condition that the radius rp of the scaled proton density equals the data rp(exp) determined from the electron scattering. We deduce skin values rskin=rn(exp)−rp(exp) from the resulting rn(exp) and the rp(exp) determined from electron scattering. The same procedure is taken for D1S-GHFB+AMP. We regard r48skin(E1pE) as a reference skin value. Using the reference skin value and taking D1M-GHFB+AMP, we determine r48skin(exp)=0.158±0.025~fm for p+48Ca scattering and 0.160±0.058~fm for 48Ca + 12C scattering. We take the weighted mean and its error for the two skin values. The result is r48skin(exp)=0.158±(0.023)exp±(0.012)th fm. 

Comments: 	arXiv admin note: substantial text overlap with arXiv:2107.06441
Subjects: 	Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)