Large basis shell model analysis of 14N( gamma, pi +)14Cg.s. reaction.

Abstract

The {sup 14}N({gamma},{pi}{sup +}){sup 14}C{sub g.s.} cross section at {ital E}{sub {gamma}}=173 MeV has been calculated using shell model wave functions determined in complete (0+2){h_bar}{omega} and (0+2+4){h_bar}{omega} shell model spaces. Using the (0+2+4){h_bar}{omega} shell model wave functions yields an improvement over older results obtained with Cohen-Kurath wave functions by a factor of 2, but still overpredicts the back-angle data. When correlated with analyses of inelastic electron and proton scattering from {sup 14}N, the present results indicate the need for an improved shell model calculation and possibly an improved description of the elementary pion production process in nuclei. {copyright} {ital 1996 The American Physical Society.}