Cross sections for the spallation production of $^{10}$Be in targets of N, Mg, and Si and their astrophysical applications

The measurements of the cross sections for the spallation production of Be were made at CERN with 600 MeV protons and in Orsay with 150 MeV protons. These were sigma (/sup 10/Be) (in mb) 1.3+or-0.6 in N, 0.7+or-0.3 in Si, and 0.6+or-0.4 in Mg for 600 MeV protons, and 0.6+or-0.2 mb in N for 150 MeV protons. Cross sections were also obtained for production of /sup 7/Be and /sup 22/Na in Si and Mg targets. The problems of /sup 10/Be production in meteorites and lunar material, in the atmosphere, in cosmic dust and cosmic rays, are discussed. (39 refs).