Neutrino-induced reaction cross sections at intermediate energies for chlorine and water detectors

Abstract

Neutrino reaction cross sections are estimated for v l + 37 Cl → l − + 37 Ar and v l( v l) + 16O → l −(l +) + X( anything) ( l = e or μ) for incident energies up to 300 MeV. For the former exclusive process we use the experimental information obtained from the mirror beta decay and the 37Cl(p, n) 37Ar reaction combined with theoretical guides provided by available shell-model wave functions. We have found that a fairly reliable calculation is possible up to 150 MeV. For the v l( v l) + 16 O reaction we have tried both the Fermi-gas model and sum-rule method, and have found that the relativistic Fermi-gas model yields a cross section that joins smoothly to the microscopic estimation for the lower energy region. Some implications of the present results are also discussed for the detection of “solar-flare neutrinos”.