The sub-Coulomb breakup of ${}_{}{}^8{}_{}{}^{}\mathrm{B}$ on a ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$ target is studied at an incident energy of 26 MeV. These data provide a measure of the $E2\mathrm{}$ component of the breakup cross section as a function of the astrophysical factor ${\mathrm{S}}_{17}$ for radiative capture of protons on ${}_{}{}^7{}_{}{}^{}\mathrm{Be}$. Implications for the solar neutrino problem are discussed.

• Received 8 February 1996

DOI:https://doi.org/10.1103/PhysRevC.53.R2598