Capture of Solar and Higher-Energy Neutrinos by Iodine 127

Details Capture of Solar and Higher-Energy Neutrinos by Iodine 127 Capture of Solar and Higher-Energy Neutrinos by Iodine 127

1994-02-17

arxiv.org/abs/nucl-th/9402022v1

Phys.Rev.C50:1702-1708,1994

Physics

Nuclear Physics

Nuclear Theory

13 pages + 3 postscript figures (attached), in RevTex 3 , submitted to Phys. Rev. C

Scientific paper

10.1103/PhysRevC.50.1702

We discuss and improve a recent treatment of the absorption of solar neutrinos by ${}^{127}$I, in connection with a proposed solar neutrino detector. With standard-solar-model fluxes and an in-medium value of -1.0 for the axial-vector coupling constant $g_A$, we obtain a ${}^8$B-neutrino cross section of 3.3$\times 10^{-42}$, about 50\% larger than in our previous work, and a ${}^7$Be 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 a calibration of the ${}^{127}$I 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.

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