Cross sections are measured for 16 O collisions with A1 and Pb. Dependences on beam momentum and atomic number are compared with data obtained at much lower beam momenta.
MODEL DEPENDENT ESTIMATION.
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Central collisions of O16 nuclei with the Ag107 and Br80 nuclei in nuclear emulsion at 14.6, 60, and 200 GeV/nucleon are compared with proton-emulsion data at equivalent energies. The multiplicities of produced charged secondaries are consistent with the predictions of superposition models. At 200 GeV/nucleon the central particle pseudorapidity density is 58±2 for those events with multiplicities exceeding 200 particles.
Nucleus is average nucleus of BR-2 emulsion.
Nucleus is average nucleus of BR-2 emulsion.
Nucleus is average AG107/BR80 nucleus of BR-2 emulsion.
We report the measurements on partial production cross sections of the multiple helium fragments emitted in the interactions of Si28 ions at 14.5A GeV in nuclear emulsion. Interaction mean free paths of the helium fragments have been investigated on the basis of helium multiplicity and size of the target nucleus as a function of the distance from their production points. Multiplicity scaling in the produced helium fragments is also observed.
FIRST REACTION RESPECTS CENTRAL, SECOND - PERIPHERAL INELASTIC INTERACTION.
FIRST REACTION RESPECTS CENTRAL, SECOND - PERIPHERAL INTERACTION. THIRD REACTION RESPECT 0HE PRODUCTION.
MULT(FRAGT) IS AVERAGED NUMBER OF HEAVY TRACKS FROM THE TARGET NUCLEUS, MULT(SHOWER) IS AVERAGED NUMBER OF MINIMUM IONIZING SHOWER TRACKS WHICH INCLUDED THE NUMBER OF SINGLY CHARGED PROJECTILE PROTON TRACKS.
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The cross sections of inelastic interaction of 22Ne with C, Al, Cu and Pb targets have been measured at an incident momentum of 4.1 GeV/c per nucleon. The following results have been obtained: 1060 +- 50 mb; 1520 +- 70 mb; 2150 +- 100 mb and 3900 +- 200 mb, respectively. The approximation of the dependence of the cross sections on the mass numbers of interacting nuclei and the measurement procedure are presented
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A search for direct electron pairs was performed at the 6.4 TeV 32 S emulsion interactions at CERN. A total of 81 directly produced electron pairs have been observed, with an average number per interaction of about two. The results have been analysed in the light of the predictions of quantum electrodynamical calculations. A simple interpretation for the extracted results based on the virtual mass distribution is presented. The experimental results are in partial agreement with the present theories. The virtual mass distribution does not show a 1/m behaviour.
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We report the results on the electromagnetic dissociation of 14.5A GeV28Si and 200A GeV16O projectiles in nuclear emulsion. The overall charge changing production cross sections are determined experimentally and are found to agree reasonably well with those computed theoretically. The relative rate as a function of decay energy for various reaction channels are parameterized in terms of an exponential function. Majority of the events in the most prominent decay modes can be attributed to the excitation of giant dipole resonances. Multiplicity distributions of α particles emerged from nuclear as well as electromagnetic interactions are also investigated.
Electromagnetic dissociation.
Electromagnetic dissociation.
The cross section is calculated from the relation sigma=f/ro*lambda, were ro=7.898*10**22 atoms per cm**3 and f is a weight factor which is unity for nuclear interactions produced by all the emulsion targets, for AG f=0.62.
A comparative study is made for12C-Em and16O-Em reactions, according to the soft-sphere model using measured mean free path and hence cross-sections together with other collected data. The fragmentation of projectile intoZ-fragments was studied in all interactions of16O-emulsion. The interactions depending on the impact parameter (which is characteristic of the target component) are investigated.
VALUES OF SIG WERE ESTIMATED USING FOLLOWING EQUATION: SIG=1/NL, WHERE N IS EFFECTIVE CONCENTRATION OF NUCLEI IN AN EMULSION OBTAINED 3.78*10**22 ATOMS/CM**3, AND L IS MEAN FREE PATH: 14.43 +-0.33 CM FOR C12 AND 12.8 +-0.33 CM FOR O16.
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