NEUTRINO MASS AND MIXING - THE IMPACT OF EXCITED-STATE CONTRIBUTIONS ON CAPTURE RATES OF GA DETECTORS

In this paper we calculate the neutrino absorption cross-sections for the reaction Ga-71(v, e(-))Ge-71 using two simple nuclear models to ac count for the giant GT resonances. In both models the excited state co ntributions are found to have significant ranges of variation and affe ct the solar neutrino capture rates. Nonetheless, the regions in the n eutrino mixing angle-mass squared difference plane allowed by the data from the Gallium detectors, when taken together with those from the C hlorine and Kamioka experiments, are found to be comparatively stable.