Cross Sections of Li, Be, and B Emitted in 125-MeVpand 90-MeVα-Particle Interactions with C and N—Application to Nucleosynthesis

The production cross sections for Li, Be, and B fragments emitted in medium-energy proton and $\alpha$-particle reactions with the C, N, and O nuclei of a nuclear emulsion have been measured. The corresponding results for the $p$-induced and $\alpha$-induced reactions have been compared. Since helium abundance in the universe is about 10%, these reactions must be taken into account when considering the nucleosynthesis of Li, Be, and B.