The 12C( 7Li, α) 15N triton transfer reaction

Abstract

The 12C( 7Li, α) reaction was studied up to 16 MeV excitation energy in 15N. Excitation functions for eight α-groups were measured in the 28–38 MeV incident energy range. A high resolution angular distribution was taken at E 7 Li = 35 MeV with the aid of a multi-gap magnetic spectrograph. The contribution of the compound nucleus channel to the α-intensities was estimated. A finite range DWBA calculation in which the three transferred nucleons enter the sd shell was attempted. Results of the above-mentioned studies and the strong selectivity of the reaction indicate a predominant direct reaction mechanism at the present relatively high bombarding energy. Comparison between the experimental results and calculations based on the weak coupling model of Lie and Engeland, exhibit reasonable correlation between the strongly excited states in the present study and the 3p-4h model states for which the contribution of the core excitation is small, and this gives a possible interpretation of the high selectivity of the reaction.