Abstract
Angular distributions of alpha particles scattered from and are reported and effective interaction radii are obtained, based on the Born approximation for elastic scattering and direct-interaction theory for inelastic scattering. For , levels at 0, 1.37, 4.2, and 6.3 Mev yield interaction radii of 6.4, 6.55, 6.5, and 6.5, respectively (units of cm). Evidence is presented in support of the assignment of the 6.3-Mev level to rather than to or , with spin and parity 1 -. For , levels at 0 and 4.48 Mev yield interaction radii of 6.65 and 7.3, respectively. Alpha-gamma angular correlations, which correspond closely to those predicted on the basis of direct-interaction theory, were obtained for (4.43-Mev level) and for (1.37-Mev level). For (4.48-Mev level) the correlation corresponds qualitatively to that predicted for a 1 - level with cascade decay through an intermediate state to ground level. Further evidence is presented which supports this interpretation. A higher level in is observed at 8.4 Mev. All alpha bombardments were made at 43 Mev incident energy.
- Received 14 November 1958
DOI:https://doi.org/10.1103/PhysRev.114.310
©1959 American Physical Society