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We have obtained pair recombination luminescence spectra of four GaP crystals with different gallium isotopic compositions. The frequency shifts measured vs. average isotopic mass allow us to determine dE 0 /dM=0.19(1)meV/amu, where E 0 is the indirect gap and M the average gallium isotopic mass. From this mass derivative, a contribution of the gallium vibrations to the zero-point...