Accession Number : ADA321489

Title :   High Energy Alpha Particles Associated with Fission,

Corporate Author : TECHNICAL INFORMATION SERVICE (AEC) OAK RIDGE TN

Personal Author(s) : Wollan, E. O. ; Moak, Charles D. ; Sawyer, R. B.

PDF Url : ADA321489

Report Date : 22 APR 1947

Pagination or Media Count : 7

Abstract : In this work the photographic emulsion technique has been applied to the study of the long range particles given off during neutron irradiation of uranium. Alvarez first observed these particles with an ion chamber and linear amplifier. Segre, et al (LA-87) studied these particles with an ion chamber which gave coincidences between these particles and fission. They found them to be coincident with fission within the time constant of their circuit (approx 5u sec). They were also able to identify these particles as alpha particles from the density of ionization near the end of the tracks. Hughes has observed a number of these alpha particles in the cloud chamber, but his setup did not permit him to observe the associated fission track. The cloud chamber or photographic emulsion technique permits information to be obtained about the alpha particles and their association with the fission process that cannot be got by the ion chamber method. The photographic emulsion technique has been used in this case because it lends itself very well to a study of rare events of this type.

Descriptors :   *FISSION PRODUCTS, *ALPHA PARTICLES, URANIUM, NEUTRON IRRADIATION, IONIZATION TRAILS, CLOUD CHAMBERS, PHOTOGRAPHIC EMULSIONS.

Subject Categories : Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE