Abstract
An intermediate-image pair spectrometer was used to study electromagnetic transitions in and . Energy levels in these nuclei were populated by means of the and reactions with deuteron energies between 1.9 and 3.1 MeV. In a 6.58-MeV transition was observed in the internal pair spectrum but not in the external pair spectrum. From this a definite assignment of can be made for the 6.58-MeV level. In the branching ratios of the 5.69→0 and 5.69→2.31 transitions were determined to be 37±2% and 63±2%, respectively. The energy differences between close-lying pair lines were measured with sufficient accuracy to allow limits to be placed on the lifetimes of some states in and . Thus, it was determined that the mean lifetime of the 6.58-MeV level is greater than 4× sec.
- Received 3 June 1963
DOI:https://doi.org/10.1103/PhysRev.132.790
©1963 American Physical Society