Population Ratios of Be7, Li7, and B10 States from Li6 on Li6 and Be9 as Functions of Bombarding Energy

Abstract

The populations of the ${\mathrm{Be}}^7$ (0.431 MeV), ${\mathrm{Li}}^7$ (0.478 MeV), and ${\mathrm{B}}^{10}$ (0.717 MeV) states have been compared in the bombardment of ${\mathrm{Li}}^6$ by ${\mathrm{Li}}^6$ over energies from 1.2 to 2.8 MeV. The populations of the same ${\mathrm{Li}}^7$ and ${\mathrm{B}}^{10}$ states have been compared in the ${\mathrm{Li}}^6$+${\mathrm{Be}}^9$ reactions over energies from 1.5 to 2.9 MeV. It is found that the ratios of these populations are constant within experimental error. A simple tunneling model and a compound-nucleus model do not appear compatible with the data; however a "surface" interaction is consistent with the results.