Abstract
Gamma-ray decay modes of the levels below an excitation energy of 4 MeV have been investigated through the reaction using a 30-cc lithium-drifted germanium, Ge(Li), detector. Gamma-ray spectra were recorded at 90°, 7°, and 173° to the beam using a thick quartz target and bombarding energies of 3.45 and 6.0 MeV. Ge(Li)-NaI(Tl) coincidence spectra were also recorded at MeV. Sharper upper limits than obtained previously were set on the relative intensities of many unobserved transitions. A previously unreported transition from the -MeV level to the -MeV level was observed with a branching ratio of (27±4)%. The mean lifetime of the 3.13-MeV level was inferred from a Doppler-shift measurement to be () × sec. It is conjectured that the 3.13-MeV level is the lowest level belonging predominantly to the configuration.
- Received 25 October 1966
DOI:https://doi.org/10.1103/PhysRev.155.1164
©1967 American Physical Society