Abstract
Cross sections have been measured for the production of , , and in proton reactions on , at energies extending from threshold to 18 MeV. The reaction products were identified by time-of-flight techniques, and total cross sections were determined by integrating over the measured angular distributions. Although the typical abundance of in nature is small compared to that of , , or , the reactions may have a significant role in the production of the light elements because of their low values. Even for a / ratio as low as the terrestrial ratio of 0.01, the inclusion of contributions is found to reduce appreciably the , , and Li/Be abundance ratios calculated for interactions at low energies between protons and a representative mixture of C, N, and O. Over-all, this reduction brings the abundance ratios calculated at proton energies below 25 MeV closer to the observed solar system ratios.
NUCLEAR REACTIONS , MeV; , MeV; , MeV; measured , , . Astrophysical production of LiBeB.
- Received 18 July 1974
DOI:https://doi.org/10.1103/PhysRevC.11.410
©1975 American Physical Society