Study of the Be-7(p,gamma)B-8 reaction with the Coulomb dissociation method

The Coulomb-dissociation cross section for the process B-8 --> Be-7 + p in the field of Pb-208 was measured at E(B-8) = 46.5 A MeV. The Be-7(p,gamma)B-8 cross section relevant to the high-energy B-8 solar-neutrino production was extracted at E(C.M.) = 0.6 - 1.7 MeV. Two theoretical models on the structure of 8B were used to evaluate possible corrections due to M1 and E2 admixtures to the dominant E1 cross sections. Their overall effect is shown to be small regardless of the choice of the models. The present result is consistent with the results of the direct measurements of Filippone et al. and Vaughn et al. within errors. This result suggests further studies with the Coulomb-dissociation method to extract astrophysical S-17 factor at similar to 20 keV relevant to the high-energy solar-neutrino flux