Accession Number : AD0263844

Title :   CORRELATED PROTON-PROTON PAIRS FROM THE HIGH ENERGY PHOTODISINTEGRATION OF LIGHT NUCLEI

Corporate Author : ILLINOIS UNIV URBANA

Personal Author(s) : LARSON,ALAN V. ; SMITH,JAMES H.

Report Date : AUG 1961

Pagination or Media Count : 1

Abstract : Targets of He, Li, C, and Al were irradiated by bremsstrahlung of 257 Mev maximum photon energy. Photodisintegrations which involve two fast protons were observed. Energy and angular distributions of the coincident protons, one of which was always observed at a laboratory angle corresponding roughly to 90 degrees in the center of mass of the two protons, were measured. The primary absorption of the photon occurs on neutron-proton pairs. The proton-proton pairs arise from subsequent internal scattering of the primary photoneutron from other protons in the nucleus. No evidence is seen that mesons are reabsorbed on nucleon pairs which do not include the parent nucleon. An upper limit is established for this process. This experiment supports the photomeson production models which do not depend upon the true absorption of mesons as they pass through nuclear matter. (Author)

Descriptors :   *PHOTONUCLEAR REACTIONS, *RADIOACTIVATION ANALYSIS, *TARGETS, BREMSSTRAHLUNG, CARBON, HELIUM, LITHIUM, MESONS, NEUTRONS, NUCLEI, PHOTONS, PROTON REACTIONS, PROTONS, SCATTERING

Distribution Statement : APPROVED FOR PUBLIC RELEASE