Production of the Light Elements Lithium, Beryllium, and Boron by Proton Spallation ofC12

Abstract
Cross sections for the production of the light elements lithium, beryllium, and boron by proton bombardment of C12 were measured for proton energies between 21.7 and 44.0 MeV. Time-of-flight methods were used to identify the masses of ions recoiling from a thin target into a semiconductor detector. The results are related to current models on the origin of these light elements, and are consistent with a suggestion that the B11/B10 isotopic ratio has remained unaltered at its formation value.