Precision Measurements of the 7Be(p,gamma)8B Reaction with Radioactive Beams and the 8B Solar Neutrino Flux

摘要

The 7Be(p,gamma)8B reaction is one of the major source of uncertainties inestimating the 8B solar neutrino flux and is critical for undertsanding theSolar Neutrino Problem and neutrinos. The main source of uncertainty is theexistence of conflicting data with different absolute normalization. Attemptsto measure this reaction rate with 7Be beams are under way by the UConn-LLNcollaboration, and we discuss a newly emerging method to extract this crosssection from the Coulomb dissociation of the radioactive beam of 8B. We discusssome of the issues relevant for this study including the question of the E2contribution to the Coulomb dissociation process which was measured to besmall. The Coulomb dissociation appears to provide a viable alternative methodfor measuring the 7Be(p,gamma)8B reaction rate, with a weighted average of theRIKEN1, RIKEN2 and GSI1 published results of S17(0) = 19.4 +/- 1.3 eV-b.