Charge-exchange in quasi-elastic scattering

The quasi-elastic peak region in the 12C(3He,t) reaction at 2 GeV over a range of triton emission angles from 2 deg to 7 deg are studied. The triton energy spectra in the framework of a quasi-elastic charge-exchange between a proton in the projectile and a neutron in the target nucleus is calculated. Constructing the t-matrix for this process with the π+ρ transition potential, and using distorted waves for 3He and triton, the overall features of the experimentally measured cross-sections are produced reasonably well. 14 refs., 4 figs