Abstract
The and the charge-exchange reactions have been studied at an incident energy of 170 MeV. The two protons in the state (indicated as were both momentum analyzed and detected by the same spectrometer and detector. Background-free spectra with a resolution of about 150 keV (full width at half maximum) have been obtained allowing identification of many levels in the residual nucleus with high precision. It is found that the reaction at is largely governed by the Gamow-Teller (GT) transition operator for the direction, which makes the reaction selective for isovector transitions. In the case of the reaction is compared with reaction data in which the same levels in the analog nucleus are populated. Angular distributions of cross sections for the reaction are presented and compared with distorted-wave Born approximation calculations. GT matrix elements are deduced. A level-by-level comparison with shell-model calculations using the universal s-d interaction has been performed. Comparison with data yields a level scheme for the isospin triplet.
- Received 8 October 2001
DOI:https://doi.org/10.1103/PhysRevC.65.044323
©2002 American Physical Society