Experiments on the Gamma-Radiation from Lithium and Fluorine Bombarded with Protons

Abstract

The recoil electrons ejected from a 2 mm carbon scatterer by the gamma-radiation from Li+${\mathrm{H}}^1$ have been investigated and indicate three lines of energies 17, 14.5, and 11.5 and possibly a fourth line of energy 8.5 Mev. Pairs ejected from the same scatterer were also observed. Most of these may be attributed to the 17 Mev line. Recoil electrons ejected from a 1.5 mm carbon scatterer by the gamma-radiation from F+${\mathrm{H}}^1$ have been observed, and indicate two lines of energies 5.7 and 4 Mev. Pairs produced by internal conversion of the gamma-radiation from F+${\mathrm{H}}^1$ were also observed, and indicate the same two lines. The cross section for this effect is in good agreement with the theoretical predictions. It is pointed out that a study of the pairs produced by internal conversion affords an excellent method of determining excitation levels in nuclei.