Abstract
The reaction has been used in conjunction with pulsed-beam , coincidence, and angular distribution measurements to investigate a proposed isomer in . The isomeric level was found at 2185 keV on the basis of its decay properties and lifetime. The mean lifetime of the isomeric level was measured to be μsec. The level decays by a 39.7-keV branch (73.7±1.0%) to the 2145-keV level and by a 750.7-keV branch (26.3±1.0%) to the 1434-keV level. An experimental is obtained for the branch, implying an effective charge of . To explore possible parity mixing between the nearly degenerate and levels, the precise energy separation of these levels was measured to be 0.44±0.02 keV. On the basis of the observed decay properties, the parity nonconserving matrix element was determined to be less than 0.34 eV.
NUCLEAR REACTIONS MeV pulsed beam; measured coincidence; deduced levels in ; measured ; deduced , , effective charges, parity mixing. Enriched target, Ge(Li), Si(Li) detectors.
- Received 2 October 1975
DOI:https://doi.org/10.1103/PhysRevC.13.1194
©1976 American Physical Society