Nuclear bremsstrahlung from 140 MeV protons

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Differential cross sections and rough energy spectra for bremsstrahlung production have been measured under 140 MeV proton bombardment of H, D, Be, C, N, O, Al, Cu and Pb. The total cross section per neutron in the target nuclei for photons above 40 MeV varied from ≈4.5 μb to ≈ μb form D to Pb. The observed cross section for the p-p system was −0.06±0.05 μb. The data from nuclei are in reasonable agreement with the limited experimental data available and with the theory of Beckham. The p-p value is much lower than any theoretical estimate.