Mechanism of the heavy-ion charge exchange reaction 12C(12C, 12N)12B at 35 MeV/nucleon

The heavy-ion charge exchange reaction 12C(12C,12N)12B has been studied at E(12C)=35 MeV/nucleon. Angular distributions in the range 3.7-12.1° (c.m.) have been measured for the 1+ (0.0 MeV), 2+ (0.95 MeV), 2- (1.67 MeV), and 4-,2- (4.5 MeV) states in 12B. A broad peak at 7.8 MeV excitation was also observed. Microscopic one-step distorted-wave Born approximation calculations yield Vστ strengths ≥2 times those obtained in (p,n) reactions at similar energies per nucleon. Although this is significantly smaller than Vστ values obtained in other heavy-ion charge exchange studies, mostly carried out at energies less than 10 MeV/nucleon, it is concluded that the reaction mechanism is still dominated by sequential transfer (two-step) processes at 35 MeV/nucleon. A rough estimate indicates that one-step processes will dominate at bombarding energies above about 50 MeV/nucleon

Light particle spectra from 35 MeV/nucleon C12-induced reactions on Au197

Energy spectra for p, d, t, He3, He4, and He6 from the reaction C12+Au197 at 35 MeV/nucleon are presented. A common intermediate rapidity source is identified using a moving source fit to the spectra that yields cross sections which are compared to analogous data at other bombarding energies and to several different models. The excitation function of the composite to proton ratios is compared with quantum statistical, hydrodynamic, and thermal models. © 1984 The American Physical Society