Abstract
Particle-gamma coincidence spectra of the reaction provide evidence for the existence of two, new, gamma-emitting levels in . A new level at 7.93 MeV is observed to decay by gamma emission to the 4.97-MeV () level; a new level at 5.88 MeV is observed to decay to the 4.25-MeV () level. Tentative spin-parity assignments are for the 5.88-MeV level and , , , or for the 7.93-MeV level. Evidence is seen for the recently discovered level at 7.02 MeV (). The data suggest a considerably larger value of for the 5.63-MeV () level than that previously reported. Angular distribution measurements of elastic and inelastic alpha-particle groups are compared with current direct-interaction theory. The production of states of with through inelastic alpha-particle scattering suggests a fairly strong spinorbit interaction between the orbital angular momentum of the incident alpha particle and the spin of one (or more) target nucleons. Possible collective model interpretations of the level structure are suggested.
- Received 25 June 1962
DOI:https://doi.org/10.1103/PhysRev.128.1312
©1962 American Physical Society