Abstract
The distribution of Gamow-Teller strength in the reaction was studied at a bombarding energy of 135 MeV. Five , states are identified below MeV and a concentration of states of presumed character is observed between MeV. Approximately 82% of the strength is concentrated into the ground-state transition and only 5.5% is seen in the component. Normalization of the ground-state transition to the known Gamow-Teller matrix element from the analogous beta decay of allows the () cross sections to be related to the Gamow-Teller strength. The resulting total Gamow-Teller strength observed in the () reaction is about two-thirds of the minimum value required by the sum rule for a nucleus. This result is in reasonable agreement with the total Gamow-Teller strength predicted from a shell-model calculation which uses empirically renormalized single-particle Gamow-Teller matrix elements. The concentration of the strength predominantly into the ground state and the observed ratio of to strength also are consistent with these calculations.
NUCLEAR REACTIONS , MeV; neutron spectra measured in ∼3° steps between 0° and 69°; angular distributions extracted for separate transitions. Strengths of forward-peaked transitions compared with shell-model predictions of Gamow-Teller strength.
- Received 26 October 1982
DOI:https://doi.org/10.1103/PhysRevC.27.1387
©1983 American Physical Society