Comparisons between theoretical and recent experimental photoproton spectra are presented for 400-MeV bremsstrahlung on carbon, aluminum, copper, and gold. Experiments are suggested which would facilitate further theoretical considerations.

NUCLEAR REACTIONS $\mathrm{C}(\gamma ,x)$, $\mathrm{Al}(\gamma ,x)$, $\mathrm{Cu}(\gamma ,x)$, $\mathrm{Au}(\gamma ,x)$, $E_{\gamma }=40-400\mathrm{}$ MeV, calculated $\sigma (E_p, \theta )$, $\sigma (E_{\pi }, \theta )$.

• Received 19 May 1975

DOI:https://doi.org/10.1103/PhysRevC.13.240