Matter radii and skins of 6,8He from reaction cross section of proton+6,8He scattering based on the Love-Franey t-matrix model

Background: For He-4,He-6,He-8, Tanihata et al. determined matter radii r(m)(sigma(I)) = 1.57(4),2.48(3),2.52(3) fm from interaction cross sections sigma(I) for He-4,He-6,He-8 scattering on Be, C Al targets at 790 MeV/nucleon. Lu et al. measured the atomic isotope shifts (AIS) for He-4,He-6,He-8 and determined proton radii r(p) (AIS) for He-4,He-6,He-8. As for p+He-4,(6,)8 scattering, reaction cross sections sigma(R) (exp) are available at 700 MeV with high accuracy. Aim: Our aim is to determine matter radii r(m) and skins r(skin), for He-6,He-8 from the sigma(R) (exp) and the r(p)(AIS). Method: Our model is the Love-Franey t-matrix folding model, since the model is better than the optical limit of Glauber model. Results: Our results for He-68 are r(m)(exp)= 2.48(3),2.53(2) fm and r(skin) = 0.78(3), 0.82(2) fm. Conclusion: For He-6,He-8, our results r(m)(sigma(R)) agree with those of Tanihata et al.. For(8)He, the distance between4 He and the center of mass of valence four neutrons is 2.367 fm.

Automated summary

This study aims to determine the matter radius and skin thickness of He-6 and He-8 by using experimental data and a folding model. The results are consistent with previous studies and reveal the distance between 4 He nuclei and the center of mass of valence electrons in He-8.