A study of the 14N(p, 2p)13C reaction at 46 MeV

Abstract

The 14 N(p, 2p) 13 C quasi-elastic reaction at 46 MeV is investigated using symmetric co-Planar geometry. For those events where | E 1 − E 2 | ≦ 5 MeV, the cross section is measured for laboratory angles from 20' to 75° by 5° steps. A calculation of the angular distribution is performed using approximate optical-model waves and a non-local p-p effective interaction. The formalism used is the distorted wave t -matrix approximation (DWTA) in the static limit, where the distorted waves are approximated by relatively simple analytic forms. The parameters in these waves describe the distortion present in the reaction. The effects of these parameters on the (p, 2p) cross section is studied and it is noticed that the various aspects of distortion are discernible. A reasonable fit to the data is obtained indicating that the approximate opticalmodel waves are capable of describing distortion at the energies involved. The effects of absorption and focussing are complimentary and the left-to-right peak ratio in the (p, 2p) distribution is greatly controlled by the final state focus phase φ.