Abstract
The recoil distance method has been used to measure the mean lifetime of the 1755-keV level of , formed (predominantly) via the fusion-evaporation reaction. The lifetimes of the 984- and 1309-keV levels of and the 1275-keV level of were obtained coincidentally. Similar measurements in the reaction determine the lifetimes of the 298- and 397-keV levels of . Data were acquired at using an escape suppression spectrometer, with and incident energies of 28.5 and 15.3 MeV, respectively. The experimental results are the following: (298,), ps; (397,), ps; (984,), ps; (1309,), ps; , ps; (1275,), ps. Shell-model calculations for and have been performed and are compared to experimental results.
NUCLEAR REACTIONS + , MeV; + , MeV; measured , (recoil distance method); deduced ; calculated from theory and compared to experiment.
- Received 17 June 1982
DOI:https://doi.org/10.1103/PhysRevC.27.158
©1983 American Physical Society