Contribution from Mechanisms of Direct Nucleon Transfer to Proton Spectra in the 15N (α, p)18O Reaction

Abstract

The differential cross section for the (α, p)¹⁸O reaction at an α-particle energy of 30 MeV is analyzed in the context of direct reaction mechanisms and the compound nucleus model. Spectroscopic amplitudes are calculated at the vertices of the diagrams illustrating triton and ¹⁴С cluster transfer reactions, including cases of mixed configurations of 1p–2d shells. The OP parameters of α–¹⁵N and p–¹⁸O interaction are found that provide the best agreement between the calculated and experimental data at an energy of ~30 MeV. It is shown that the main contribution to the production of protons comes from direct triton cluster transfer. The role of the heavy ¹⁴С cluster transfer mechanism and the compound nucleus mechanism is notable in the region of angles greater than 90°.