Specificity of the (p,n) Reaction at 35 MeV for Gamow-Teller Strength

Calculations are presented for the reaction ${}_{}{}^{71}{}_{}{}^{}\mathrm{Ga}\mathrm{}(p,n)\mathrm{}{}_{}{}^{71}{}_{}{}^{}\mathrm{Ge}$ at $E_p=35\mathrm{}$ MeV. Differential cross sections to the ground state and the 0.175- and 0.500-MeV states are estimated and compared with experimental results. It is shown that the 0° ($p$, $n$) cross section at $E_p=35\mathrm{}$ MeV is not directly proportional to the Gamow-Teller strength and thus the experimental results cannot be used to used to estimate the absorption of solar neutrinos.