Abstract
Calculations of the neutrino-capture cross sections for69,71Ga based on a microscopic treatment of the Gamow-Teller matrix elements are presented. A strong enhancement of the cross-section for high-energetic neutrinos is found compared to previous phenomenological estimates. As a consequence the present assumptions on the signal from8B neutrinos in71Ga have to be revised. A rather large solar model dependent background of8B neutrinos has to be expected in a gallium solarneutrino experiment together with the pp signal. This will complicate the interpretation of such an experiment particularly in the case of neutrino oscillations with not maximum mixing angle. The calculations yield a larger sensitivity of the gallium detector than assumed previously for galactic neutrinos.
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