CVII. The radioactivity ofF20.—I

Abstract

The beta and gamma radiation emitted by F²⁰ has been studied by absorption, coincidence and spectrometer techniques. The upper limit of the beta particle spectrum was found to be 5·03±0·05 MeV. and gamma rays of 1·63±0·02 MeV. and 2·45±0·06 MeV. with an intensity ratio of (8·4±2·6) to 1 were also observed. No gamma-gamma coincidences were found, and it is concluded that the predominant mode of disintegration of F²⁰ leads to a 1·63 MeV. excited state of Ne²⁰. The total energy release F²⁰-Ne²⁰ is 6·66±0·05 MeV., and the mass of F²⁰ derived from this value is compared with that obtained from the F¹⁹ (dp) and F¹⁹ (nγ) reactions.