Abstract
The nuclei , , and have been investigated using bombardment of at about 25 MeV bombarding energy. Further information has been obtained on the nuclei and from the bombardment of at the same energy. Experimental methods used included recoil distance lifetime measurements (RDM), coincidence measurements, angular distribution measurements, and Doppler shift attenuation lifetime measurements (DSAM) on rays from high spin states in the various nuclei. Mean lifetimes determined by RDM were as follows: in , 3114-keV level ( psec); in , 156-keV level ( psec); 368 keV (10.4 ± 1.6 psec); 1073 keV (292 ± 50 psec); in , 847-keV level ( psec). Tentative spin assignments were made as follows: in , 4751-keV level, (this state can be identified with the seniority 4, state predicted in this region); in , 1073-keV level ; in , 3389-keV level . Decay schemes observed in these nuclei are presented. Lifetimes (or limits) were also established from DSAM measurements for a number of other levels in these nuclei. Recent shell model calculations for these nuclei are discussed.
NUCLEAR REACTIONS , , , , , MeV; measured coin.; deduced levels in , , , ; measured ; deduced for high-spin states; measured recoil distance; deduced , . Natural target, Ge(Li) detectors.
- Received 13 August 1974
DOI:https://doi.org/10.1103/PhysRevC.10.2329
©1974 American Physical Society