The ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$(γ,${\mathrm{\pi }}^{+}$${)}^{14}$${\mathrm{C}}_{\mathrm{g}.\mathrm{s}.\mathrm{}}$ cross section at ${\mathit{E}}_{\gamma }$=173 MeV has been calculated using shell model wave functions determined in complete (0+2)ħω and (0+2+4)ħω shell model spaces. Using the (0+2+4)ħω 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 ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$, 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. © 1996 The American Physical Society.

• Received 22 March 1996

DOI:https://doi.org/10.1103/PhysRevC.54.1863