Accession Number : AD0267529

Title :   MESON PRODUCTION IN NUCLEUS-NUCLEUS COLLISIONS

Corporate Author : WEIZMANN INST OF SCIENCE REHOVOTH (ISRAEL)

Personal Author(s) : ALEXANDER,G. ; AVIDAN,J.

Report Date : 15 NOV 1960

Pagination or Media Count : 1

Abstract : Nucleus-nucleus collisions at cosmic ray energies are described by a simple geometrical model as a reaction in two stages: (a) Violent head-on collisions between incident and target nucleons in the overlapping volumes of the 2 colliding nuclei, in which many mesons and relativistic nucleons are formed, and make the jet of shower particles of the heavy primary stars in photographic emulsion. The average number of shower particles so produced is proportional to the average number of colliding incident nucleons; and (b) Nuclear excitation of the non-directly hit parts of both incident and target nuclei. This excitation causes in most cases the complete disintegration of the incident nucleus into nucleons, alpha-particles, and heavier fragments. The analysis of the angular distribution of protons and alpha-particles (black prongs) associated with large stars indicate a slight movement whose effective velocity is about 0.03 of the excited heavy (Br and Ag) target nuclei. (Author)

Descriptors :   ALPHA PARTICLE REACTIONS, ALPHA PARTICLES, CHEMICAL ELEMENTS, COSMIC RAYS, COSMIC RAYS, ENERGY, EXCITATION, GEOMETRY, IONIZATION, MATHEMATICAL ANALYSIS, MESONS, NUCLEAR PHYSICS, NUCLEAR REACTIONS, NUCLEI, NUCLEONS, PHOTOGRAPHIC EMULSIONS, PRODUCTION, RECOIL ATOMS

Distribution Statement : APPROVED FOR PUBLIC RELEASE