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Neutrino absorption cross sections for 71Ga are calculated for all solarneutrino sources with standard energy spectra, and for laboratory sources of51Cr and 37Ar; the calculations include, where appropriate, the thermal energyof fusing solar ions and use improved nuclear and atomic data. The ratio, R, ofmeasured (in GALLEX and SAGE) to calculated 51Cr capture rate is R = 0.95 +/-0.07 (exp)} + ^{+0.04}_{-0.03} (theory). Cross sections are also calculated forspecific neutrino energies chosen so that a spline fit determines accuratelythe event rates in a gallium detector even if new physics changes the energyspectrum of solar neutrinos. Theoretical uncertainties are estimated for crosssections at specific energies and for standard neutrino energy spectra.Standard energy spectra are presented for pp and CNO neutrino sources in theappendices. Neutrino fluxes predicted by standard solar models, corrected fordiffusion, have been in the range 120 SNU to 141 SNU since 1968.

Gallium solar neutrino experiments: Absorption cross sections, neutrino spectra, and predicted event rates