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A SEARCH FOR ANTIPROTONS AND STUDY OF PARTICLE PRODUCTION IN 3-BEV PROTON-NUCLEUS COLLISIONS.
Technical rept. Oct 63-Jan 66,
PRINCETON UNIV N J ELEMENTARY PARTICLES LAB
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In two counter experiments at the Princeton-Pennsylvania Accelerator, a study has been made of 2.9 BeV proton-nucleus collisions. In the first experiment differential cross sections were measured as a function of momentum for the production of Pi mesons, K mesons, protons, deuterons, tritons, and helium-3 by 2.9 BeV protons striking beryllium and platinum targets. The Be data were taken at laboratory angles of 13, 30, 60, and 93 degrees relative to the direction of the incident proton beam the Pt data, at 13 degrees and 93 degrees only. An analysis of these cross sections is given in terms of models of proton-nucleus interactions. The copious production of deuterons and tritons at all angles is found to be a complex nuclear effect. In a second experiment, antiproton production was observed in 2.88 BeV and 2.05 BeV proton-copper collisions, at a laboratory angle of 13 degrees and at a momentum of 760 MeVc. The cross section for this antiproton production is presented, and used to estimate the distribution of Fermi momenta of the nucleons in the copper nucleus. Author
APPROVED FOR PUBLIC RELEASE