Abstract
The particle-gamma angular correlation method of Litherland and Ferguson was used to gain information on the decay modes and spin assignments of the 2.00-MeV level; the 5.83- and 7.03-MeV levels; and the 5.28-, 6.33-, 8.31-, and 8.57-MeV levels. The , , and reactions were used to populate the levels. Protons and particles were detected in an annular counter at 170° to the beam and gamma rays were detected at angles between 20 and 90° to the beam. The spin of the 2.00-MeV level was found to be ½, , or with the quadrupole-dipole mixing parameter of the 2.00 → 0 transition given by , or for and for . The angular distribution of the 7.03 → 0 transition gave for this to transition. A 7.03 → 3.95 transition was observed with a branching ratio of 9±5%. The results for the 5.83-MeV level were consistent with earlier work. The 5.28-MeV level was assigned with a value of - (0.15±0.06) or + (6.1±1.4) for the octupole-quadrupole mixing ratio of the 5.28 → 0 transition. The 6.33-MeV level was assigned with a value of + () or + () for the 6.33 → 0 mixing ratio. Most probable assignments of and are made to the 8.31- and 8.57-MeV levels on the basis of this and previous work. The results are compared to shell-model predictions.
- Received 19 November 1964
DOI:https://doi.org/10.1103/PhysRev.138.B104
©1965 American Physical Society