The Pair Internal Conversion Coefficient in the F+H′ Reaction and Measurements on the Gamma-Ray Spectrum

The gamma-radiation from F+H′ was studied by the cloud-chamber method and was found to consist of a single line at 5.8 Mev. The group of electrons at about 4 Mev found by Gaerttner and Crane was confirmed, and it is shown that this group probably consists of the negative members of internal conversion pairs. The coefficient for pair internal conversion was measured and found to be about 1 pair per 100 gamma-ray quanta, which is greater than the theoretical value. A search was made for gamma-radiation down to 0.5 Mev, and for delayed emission of electrons by the Ca${\mathrm{F}}_2$ after bombardment, with negative results in each case.