13C(11B, 12С) 12В reaction mechanisms at 45 МеV and interaction of 12С + 12В, 12С + 10,11В nuclei

Abstract

The reaction 13C(11B,12C)12B at Еlab(11B) = 45 MeV was investigated for the ground states of 12C and 12B nuclei and excited states of 12B nucleus. New experimental data for the angular distributions of the reaction cross-sections were obtained. The experimental data were analyzed within the coupled-reaction-channels method (CRC). The 13C + 11B elastic scattering channel as well as channels for one- and two-step transfers of nucleons and clusters were included in the coupling scheme. The Woods - Saxon (WS) potential was used in the CRC-calculations for the entrance reaction channel with parameters deduced previously from the analysis of the experimental data of 11B + 13C elastic and inelastic scattering, whereas the WS potential for the exit 12C + 12B reaction channel was deduced from the fitting of CRC cross-sections to the 13C(11B,12C)12B reaction experimental data. Needed for CRC-calculations spectroscopic amplitudes (factors) of the nucleons and clusters transferred in the reaction were calculated within the translational-invariant shell model. The direct mechanisms of the transfers of nucleons and clusters were investigated in this reaction. The 12С + 12В potential parameters were deduced and comparisons of the CRC reaction cross-sections calculated with the 12C + 12B and 12C + 10,11B potential parameters were performed. The differences between these CRC calculations were observed. The "isotopic effects" were observed for the potentials of 12C interactions with boron isotopes 10, 11, 12B.

Keywords

• nuclear reaction 13c(11b
• 12с)12в
• coupled-reaction-channels method
• spectroscopic amplitudes
• optical potentials
• reaction mechanisms.