Excitation functions were measured for 78Kr(p,pn)77Kr, 78Kr(p,x)77Br and 78Kr(p,α)75Br reactions from threshold to 20 MeV by the activation technique using 99.4% enriched 78Kr as target gas. There is a strong discrepancy between our data and the literature values for the 78Kr(p,pn)77Kr and 78Kr(p,α)75Br reactions. Differential and integral yields of 77Kr, 77Br and 75Br were calculated from our excitation functions. The calculated integral yields of 75Br and 77Br are approximately in agreement with the low-current irradiation experimental yield data reported in the literature. The thick target yields of both 75Br and 77Br at a small cyclotron (Ep ≈ 17 MeV) are small [1.9 mCi (70 MBq)/μAh and 70 μCi (2.6 MBq)/μAh, respectively] and due to the very high cost of the target gas, the two production processes are uneconomical. At a medium-sized cyclotron with Ep ≥ 25 MeV, however, the 77Br yield would be appreciably higher and the process could be very suitable for production of 77Br.
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