Coulomb Dissociation ofB8and theBe7(p,γ)B8Reaction at Low Energies

The cross section for Coulomb dissociation of ${}_{}{}^8{}_{}{}^{}\mathrm{B}$—the ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}\left({}_{}{}^8{}_{}{}^{}\mathrm{B}{}_{}{}^7{}_{}{}^{}\mathrm{Be}p\right){}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$ reaction—was measured using a ${}_{}{}^8{}_{}{}^{}\mathrm{B}$ radioactive beam of 46.5 MeV/nucleon energy, and the cross section for the ${}_{}{}^7{}_{}{}^{}\mathrm{Be}(p,\gamma ){}_{}{}^8{}_{}{}^{}\mathrm{B}$ capture reaction was deduced at low energies; $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}=0.6-1.7\mathrm{}$ MeV. The extracted astrophysical $S_{17}$ factors were found to be consistent with the values measured by Vaughn et al. and Filippone et al. This result encourages further experimental studies extended to lower relative energies for a new determination of the $S_{17}$ value relevant to the ${}_{}{}^8{}_{}{}^{}\mathrm{B}$ solar neutrino flux.