The Scattering of Alpha-Particles by Carbon and Oxygen

Abstract

The scattering of alpha-particles by carbon and oxygen has been observed at large scattering angles, with solid targets and RaC' as a source. The results show resonances in carbon at energies of 5.5, 5.0 and 4.4 Mev and indicate that the angular momentum quantum number of the compound nucleus ${\mathrm{O}}^{16}$ is probably 2 for the highest level, and greater than zero for the others. Two resonances have been observed in oxygen at energies of 6.5 and 5.5 Mev. These indicate excited states of ${\mathrm{Ne}}^{20}$ whose angular momentum is probably unity. These two levels correspond very closely with those found by Bonner in the disintegration of fluorine by deuterons.