HEAVY NUCLEI AND $alpha$ PARTICLES BETWEEN 7 AND 100 BEV/NUCLEON. II. FRAGMENTATIONS AND MESON PRODUCTIONHEAVY NUCLEI AND $alpha$ PARTICLES BETWEEN 7 AND 100 BEV/NUCLEON. II. FRAGMENTATIONS AND MESON PRODUCTION

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 Author Jain, P. L. ♦ Lohrmann, E. ♦ Teucher, M. W. Source United States Department of Energy Office of Scientific and Technical Information Content type Text Language English
 Subject Keyword PHYSICS ♦ ALPHA PARTICLES- ANGULAR DISTRIBUTION- COSMIC RADIATION- CROSS SECTIONS- DISTRIBUTION- ENERGY- ENERGY RANGE- FISSION- INTERACTIONS- MEASURED VALUES- MESONS- MULTIPLICITY- NUCLEAR EMULSIONS- PARTICLE TRACKS- PRIMARY COSMIC RADIATION- PRODUCTION- PROTONS ♦ ANGULAR DISTRIBUTION- COSMIC RADIATION- CROSS SECTIONS- DISTRIBUTION- ELECTRIC CHARGES- ENERGY- ENERGY RANGE- FISSION- HEAVY NUCLEI- INTERACTIONS- MEASURED VALUES- MESONS- MULTIPLICITY- NUCLEAR EMULSIONS- NUCLEI- PARTICLE TRACKS- PRIMARY COSMIC RADIATION- PRODUCTION- PROTONS Abstract Three hundred seventeen heavy-nuclei and 175 alpha particle interactions of more than 7 Bev/nncleon were found in a systematic way and analyzed. Average values and fluctuations of the individual values for the energy of heavy nnclei were obtained. At an average energy of 10 Bev/nucleon and 40 Bev/nucleon the average number of charged mesons produced by alpha -particle interactions with emulsion nuclei was found to be 4.6 and 8.2, respectively. About one-half of the nucleons of the alpha particle participate in the collision. The meson multiplicities per participating nucleon agree for proton and alpha -particle collisions at 10 Bev/nucleon. The angular distribution of the shower particles emitted from the interactions was measured, and the energy of the interactions from the angular distribution was calculated by using the median angle formula or equivalent formulas, based on the "meson spectrum independent" approximation. These methods overestimate the true primary energy on the average by a factor of 2 (for interactions with less than 5 heavily ionizing prongs). This is due to the relatively large proportion of slow mesons in the c.m. system. The distribution of primary energy as obtained by this method around the true value is shown for two groups having average energies of 10 Bev/nucleon and 40 Bev/nucleon. Equivalent results are given for the heavy- nuclei interactions. The average number of mesons produced in collisions between heavy nnclei and emulsion nuclei at an average energy of 20 Bev/nucleon is given. It increases with the charge of the incident nncleus in agreement with a crude geometrical model. (auth) ISSN 0031899X Educational Use Research Learning Resource Type Article Publisher Date 1959-08-01 Publisher Department Univ. of Chicago Journal Physical Review Volume Number 115 Organization Univ. of Chicago