CAPTURE OF SOLAR AND HIGHER-ENERGY NEUTRINOS BY I-127

We discuss and improve a recent treatment of the absorption of solar neutrinos by I-127, i, connection with a proposed solar neutrino detector. With standrard-solar-model fluxes and an in-medium value of -1.0 for the axial-vector coupling constant ga, we obtain a B-8-neutrino cross section of 3.3x10(-42), about 50% larger than in our previous work, and a Be-7 cross section that is less certain but nevertheless also larger than before. We then apply the improved techniques to higher incoming energies that obtain at the LAMPF beam dump, where an experiment is underway to finalize calibration of the I-127 With electron neutrinos from muon decay. We find that forbidden operators,which play no role in solar-neutrino absorption, contribute nonnegligibly to the LAMPF cross section, and that the preliminary LAMPF mean value is significantly larger than our prediction.