Abstract
This paper describes the extension of the photographic plate technique to the recording of fission fragment tracks and the application of this method to the study of rare modes of fission in the case of the slow neutron fission of uranium. The emission of a short-range group of light particles in the fission of U 235 , reported by Cassels, Dainty, Feather & Green, is confirmed and the angular and range distributions of these particles described. In addition, the emission of long-range light particles with ranges up to 45 cm. of air is described. The abundance of this mode of fission is 1 in 340 + 40 fission events. The angular and range distributions of these long-range particles are given.
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