A study of the production of strange octet and decuplet baryons in hadronic decays of the Z recorded by the DELPHI detector at LEP is presented. This includes the first measurement of the∑± average multiplicity. The total and differential cross sections, the event topology and the baryon-antibaryon correlations are compared with current hadronization models.
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The fragmentation topology of28Si at 3.7A GeV and 14.6A GeV and32S at 200A GeV in reactions with emulsion nuclei is presented. The fragmentation cross sections are very similar at all three energies. A statistical percolation model can qualitatively describe the data forZ≥ 6. The He production is underestimated and the 3 ≤Z ≤ 5 fragments overestimated by this model.
JINR.
BNL-815.
CERN-EMU-001.
Simultaneous measurements of inclusive energy spectra and multiplicities of π±, K±, n, p, d, and t following antiproton annihilation on nuclei over a wide energy range and in the case of neutrons down to the evaporative part of the spectra are reported. Thirteen targets in the mass range of A=12–238 were used in a target mass dependent investigation of the fast stage of the antiproton-nucleus interaction. The deduced transferred, preequilibrium and equilibrium excitation energies agree very well with the dynamical picture drawn by the intranuclear cascade model (INC). Ratios of directly emitted neutrons to protons have been determined to be about twice the N/Z ratio in the target nucleus nearly independently of its mass. These unexpected values for this new sensitive observable are not completely understood in the standard framework of INC. Possible effects of isospin and nucleon densities as well as further schemes beyond the INC are discussed.
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The shower particles multiplicity distribution produced in 60A GeV16O-Em collisions is studied in the framework of an extended Glauber model in which terms higher than the first (optical limit) in the phase shift expansion are considered. These are the so-called eclipse correction terms. The calculated distribution shows satisfactory agreement with the present experimental data.
TARGET NUCLEUS IS NUCLEI OF FUJI EMULSION.
We present the basic characteristics of singly, doubly and heavily charged fragments of the incident nucleus in inelastic interactions of relativistic24Mg nuclei in nuclear emulsion. The relationship between the charge of the incident projectile nuclei and those of the projectile fragments is studied. The result reflects the importance of the charge of the incident projectiles and consequently the electromagnetic interactions in the fragmentation processes.
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Experimental data on multiplicities and correlations of charged particles of different types produced in collisions of 4.5 A GeV/c carbon-12 with emulsion are reported and discussed. The data are compared with the results of other experiments on nucleus–nucleus and hadron–nucleus collisions. It is found that the particle production mechanism in nucleus–nucleus collisions is almost the same as in hadron–nucleus collisions. It is also observed that the shower particles' multiplicity distributions obey a KNO type scaling law, which supports the aforementioned result.
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Data were obtained using the streamer chamber spectrometer SKM-200 at a momentum of 4.5 GeV/c per incident nucleon. From the analysis of angular distributions of pi - mesons the anisotropy coefficient a for He-Li, He-C, C-Ne, C-Cu, C-Pb, O-Pb and Mg-Mg collisions was obtained. It has been shown that a is similar for symmetric systems of nuclei (He-Li and Mg-Mg) and increases slowly with mass numbers of projectile (Ap) and target (AT) for other pairs of nuclei. The anisotropy coefficient a increases linearly with the kinetic energy E*kin (in the CMS) for all pairs of nuclei. The qualitative agreement of our results with the predictions of the intranuclear cascade models has been observed.
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The multiplicity distributions and the correlations of different types of slow particles produced in 200A GeV oxygen-induced interactions with emulsion nuclei are presented. The experimental distributions are studied within the framework of the generalized Andersson-Otterlund-Stenlund (AOS) model for nucleus-nucleus interactions. The generalized (AOS) model fails to describe the present experimental data. Also a systematic comparison using the calculations of VENUS model is made. The grey-particles multiplicity is successfully reproduced by the theoretical multistring model VENUS, while the model is inadequate for explaining the distribution of black particles.
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In this letter the distribution of slow target associated particles emitted in Au + Emulsion interactions at 11.6 A GeV/ c is studied. The three models RQMD, FRITIOF and VENUS are used for comparisons and especially their treatment of rescattering is investigated.
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PROJECTILE ASSOCIATED HE-FRAGMENTS.
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Data on the mean multiplicity ofπ- produced in minimum bias proton-proton, proton-neutron and proton-nucleus interactions as well as central nucleus-nucleus collisions at momenta of 1.4–400 GeV/c per nucleon have been compiled and studied. The results for neutron-neutron and nucleon-nucleon interactions were then constructed. The dependence of the mean pion multiplicity in proton-nucleus interactions and central collisions of identical nuclei are studied as a function of the collision energy and the nucleus mass number. The number of produced pions per participant nucleon in central collisions of identical nuclei is found to be independent of the number of participants at a fixed incident momentum per nucleon. The mean multiplicity of negatively charged hadrons per participant nucleon for central nucleus-nucleus collisions is lower by about 0.12 than the corresponding multiplicity for nucleon-nucleon interactions atpLAB≲15 A·GeV/c, whereas the result at 200 A·GeV/c is above the corresponding nucleon-nucleon multiplicity. This may indicate change of the collision dynamics at high energy.
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MEAN MULTIPLICITY OF N N COLLISIONS IS DEDUCED FROM PROTON-PROTON DATA.
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