Differential and total cross sections for the reactions ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}$($\gamma$,${\pi }^{+}$)${}_{}{}^{10}{}_{}{}^{}\mathrm{Be}$ and ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$($\gamma$,${\pi }^{+}$)${}_{}{}^{16}{}_{}{}^{}\mathrm{N}$ are calculated within the distorted wave impulse approximation and compared to experiment and to the results of similar calculations with different versions of the elementary photoproduction amplitudes, nuclear wave functions, and $\pi$-nucleus optical potentials. Although the calculated results are in fairly good agreement with each other, discrepancies with experiment are much in evidence.

NUCLEAR REACTIONS ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}$($\gamma$,${\pi }^{+}$)${}_{}{}^{10}{}_{}{}^{}\mathrm{Be}$, ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$($\gamma$,${\pi }^{+}$)${}_{}{}^{16}{}_{}{}^{}\mathrm{N}$. Calculated $\frac{d\sigma }{d\Omega }$, $\sigma$; compared with experiment, other calculations.

• Received 8 December 1981

DOI:https://doi.org/10.1103/PhysRevC.25.2162