We have used the 43 MeV/nucleon primary tritium beam of the AGOR facility with an intensity of 4×107 pps and the BBS experimental setup to study the (t,He3) reaction between 0°and 5°lab angles on C12, Ca48, and Ni58 targets. The standard ray-tracing procedure has allowed us to obtain excitation-energy spectra up to 30 MeV in six angular bins for each residual nucleus, with an average energy resolution of 350 keV. The reaction mechanism has been described in distorted-waves Born approximation (DWBA) using the DWBA98 code. In this approximation, the form factor is treated as a folding of an effective projectile-nucleon interaction with a transition density. The effective projectile-nucleon interaction has been adjusted to reproduce the 0°cross section of the 1+ ground state of B12 populated in the C12(t,He3) reaction. We have employed random-phase approximation (RPA) wave functions of excited states to construct the form factor instead of the normal modes wave functions used earlier. This new DWBA+RPA analysis is used to compare calculated and experimental cross sections directly and to discuss the giant resonance excitations in K48 and Co58 nuclei.
ASJC Scopus subject areas
- Nuclear and High Energy Physics