Bremsstrahlung Production inp−pCollisions at 30 MeV

The proton-proton bremsstrahlung production cross section has been measured at 30-MeV incident proton energy and at 35° in the Harvard geometry. Using the same assumptions about the dependence of the cross section on noncoplanarity as were made in previous work at low energies, a value of 1.85 μb/${\mathrm{sr}}^2$ is obtained, with a statistical error of 0.25μb/${\mathrm{sr}}^2$ and a total error estimated to place an upper limit of about 4 μb/${\mathrm{sr}}^2$ on the cross section. This upper limit disagrees with Signell and Marker's prediction of about 15 μb/${\mathrm{sr}}^2$.