Cosmic-ray nucleosynthesis of p-nuclei

Yields of the primary and secondary spallation processes and differential yields from respective seed nuclides are calculated. We find that the CR energy region of <=O(100)MeV/nucleon predominantly contributes to the total yields. The atomic cross sections in the low-energy range adopted in this study are then necessary.

Effects of CRN on the Galactic chemical evolution of p-nuclides are calculated. Important seed nuclides are identified for respective p-nuclides. The contribution of CRN is significant for ^180m^Ta, accounting for about 20% of the solar abundance.

About 87% of the ^180m^Ta CRN yield can be attributed to the primary process. The most important production routes are reactions of ^181^Ta, ^180^Hf, and ^182^W. CRN yields of other p-nuclides are typically about O(10^-4^-10^-2^) of solar abundances.