CVIII. The determination of the mass of energetic helium isotopes emitted in nuclear explosions

Abstract
The mass spectrum of energetic helium isotopes, ejected during the explosive disintegration of nuclei, is determined, and the 3He/4He-ratio is found to be less than 0·05. The frequency of emission of energetic 6He-nuclei is probably negligible. Measurements are carried out on the ratio of single protons to deuterons at an altitude of 3500 m, and the result is found to be in accordance with previous estimates. The identification of the particles depends on a particular scattering method which is described.