J dependence in the reaction 16O( pi +,2p)14N at 116 MeV.

Abstract

A distorted wave impulse approximation formalism is described for (${\ensuremath{\pi}}^{+}$,2p) reactions. The reaction is assumed to proceed via absorption on a deuteron-like p-n pair projected from shell-model wave functions. The spin dependence of this primary interaction is assumed to be dominated by s-wave \ensuremath{\Delta}-nucleon terms. Spin-orbit distortions of the emitted protons, and the coherent addition of different orbital angular momentum transfers, L, are properly taken into account. For L=2, the calculations show a significant dependence on the total angular momentum transfer, J${=1}^{+}$, ${2}^{+}$, or ${3}^{+}$. These new calculations are compared with experimental data for the $^{16}({\ensuremath{\pi}}^{+}$,2p${)}^{14}$N reaction.