Cross Sections forLi6andLi7Production from the Bombardment ofC12by 150- and 600-MeV Protons and 880-MeV Alpha Particles

Abstract

The cross sections for ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$ and ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$ produced in fragmentation of ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ by protons of 150 and 600 MeV and $\alpha$ particles of 880 MeV have been measured by mass spectrometry. The proton-induced cross sections are significantly larger than previous measurements at 600 MeV. The $\alpha$-induced cross sections are roughly a factor of 2 larger than the proton results. The implications of the new cross sections to the problem of light-element (Li, Be, B) production in cosmic rays are discussed.