An Investigation of the C12 + He3 Reactions at Bombarding Energies Between 1.8 and 5.4 MeV

The differential cross sections at several angles and some angular distributions of the following outgoing radiations induced by He3 in C12 targets from 1.8 to 5.4 MeV were measured; elastic He3, proton groups corresponding to the formation of the N14 ground state and excited states at 2.311, 3.945, 4.91, 5.10, 5.69, 5.83, 6.23, 6.44 and 7.03 MeV (p0 to p6, p8, p9 and p11), the 6.44 MeV gamma ray (γ6.44) following the p9 group, and the α groups corresponding to the formation of the C11 ground state and the first excited state at 2.00 MeV. Proton groups to N14 states at 6.05 and 6.70 MeV (p7 and p10) were not observed. Both the p9 and the corresponding γ6.44 show a strong isolated resonance at 2.990±0.010 MeV with Γlab = 125±10 keV. Analyses at this resonance on the elastic He3, p9, γ6.44, p1 and n0 data, assuming pure compound nucleus formation as the reaction mechanism, yielded Jπ = 52+ for the corresponding state in O15∗ at 14.46 MeV and even parity for the 6.44 MeV state of the residual nucleus N14. Indications of resonances at 2.45±0.04, 2.75±0.04, 3.28±0.04, 3.60±0.04, 4.20±0.01, 4.37±0.04, 4.6±0.1 and 5.0±0.1 MeV, corresponding to the states in O15 at 14.03, 14.27, 14.69, 14.95, 15.43, 15.57, 15.75 and 16.07 MeV were also observed.