Heavy-particle emission from the reactions 19F + d and 19F + 3He

Abstract

The reactions 19F(d, 6Li) 15N, 19F(d, 9Be) 12C and 19F( 3He, 10B) 12C have been studied at bombarding energies between 7.5 and 13.0 MeV. The heavy particles emitted were identified by a simultaneous analysis of particle energy and time of flight. Differential cross sections for the reaction 19F(d, 6Li) 15N have been measured at several bombarding energies in the range 9.0–12.5 MeV. Excitation functions for this reaction were measured at θ lab = 70° and 180° between E d = 7.5 and 13.0 MeV. Angular distributions were measured for the 19F(d, 9Be) 12C reaction at E d = 9.0 and 12.0 MeV, and a 180° yield curve was measured between E d = 9.0 and 12.6 MeV. An angular distribution for the 19F( 3He, 10B) 12C reaction was obtained at E( 3 He) = 13 MeV . The observations that in all cases the angular distributions show diffraction-like structure and the excitation functions do not fluctuate strongly indicate that a direct-reaction mechanism is dominant. However, attempts to fit the data with calculations based on the distorted-wave Born approximation and assuming pick-up of an α-particle (for the (d, 6Li) case) or a 7Li (for the (d, 9Be) and ( 3He, 10B) cases) were mostly unsuccessful.