Abstract
The reaction (at MeV) has been used to investigate the decay of the 6.18-MeV level of . Both of the -ray transitions 6.18→5.96 and 6.18→3.37 have been observed by means of coincidence experiments using Ge(Li) and NaI(Tl) detectors. The mean life of the 6.18-MeV state is found to be psec from a Doppler-shift measurement on the 6.18→5.96 transition. It is concluded that the 6.18→5.96 transition takes place mainly to the component of the 5.96-MeV doublet and has an energy of 219.4±0.3 keV. The intensities of proton groups leading to levels of in the () reaction at MeV were determined with a Buechner spectrograph By combining the present results with previous measurements on the 6.18-MeV ground-state transition, the branching ratios (in%) from the 6.18-MeV state to the states at 5.96 MeV (), 3.37 MeV (), and 0 MeV () are found to be 4.6±1.5, 95±2, and 0.24±0.08, respectively. The significance of these results is discussed. Incidental results are a value of 169.25±0.04 keV for the 3.85→3.68 transition and a meanlife of 2.0±0.6 psec for the 2.15-MeV level.
- Received 14 April 1969
DOI:https://doi.org/10.1103/PhysRev.185.1242
©1969 American Physical Society