-4- UCRL-4505 SOME FISSION PRODUCT YIELDS OF URANIUM BOMBARDED WITH DEUTERONS OF VARIOUS ENERGIES (20-190 MEV) Harry G. Hicks, Peter C. Stevenson, Richard S. Gilbert, and William H. Hutchin University of California Radiation Laboratory Livermore Site May 20, 1955 L INTRODUCTION Lindner and Osborne! were among the first to study in detail the manner in which individual fission reactions change with bombarding particle energy in the hundred-Mev region. The present work furnishes additional data about individual fission reactions and serves to provide a somewhat broader basis for further study of the mechanism of high-energy fission.“ Natural uranium was bombarded with various energy deuterons (20-190 Mev) and the following nuclides observed: pql le Agh!t, and Bal40. Il Sr 89, Zr?! pq!99, EXPERIMENTAL PROCEDURE Targets bombarded using the internal circulating beam of the Berkeley 184-inch cyclotron were assembled according to the schematic drawing in Fig. 1. The aluminum beam monitor and uranium target foils were sandwiched between guard foils of the same material to protect them from contamination and to compensate for loss of recoiling radionuclides. Foils were cut in a special device to produce foils of equal area. The monitor and target foils were weighed, assembled, and aligned to ensure that all foils intercepted the same beam intensity. Targets were bombarded tM. Lindner and R. N. Osborne, Phys. Rev. 94,1323 (1954) Aur, G. Hicks and R. S. Gilbert, U CRL-4506 - 20018b5