Multiparticle production in particle-nucleus collisions at high energies

Berlad, G.; Dar, Arnon; Eilam, G.

doi:10.1103/physrevd.13.161

Cited by 99 publications

(30 citation statements)

References 19 publications

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“…The CTM [24][25][26][27] predicts that should vary as^1 /4 , since the number of grey particles, , is considered as the best measure of the number of collisions. Thus, none of these predictions of models agree with experimental results.…”

Section: Resultsmentioning

confidence: 99%

A Study of Pion-Nucleus Interactions in terms of Compound Particles

Ahmad

2014

ISRN High Energy Physics

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We report some results on the compound multiplicity distribution at 340 GeV/c − nucleus interactions. Compound multiplicity distribution is found to depend on the target size and the distribution becomes broader. The peak of the distribution shifts towards higher values of the compound particle multiplicity. Mean compound multiplicity is found to vary linearly with grey, heavy, and shower particle multiplicity. Correlations between different particle multiplicities have been studied in detail. Dispersion of compound multiplicity distributions and its ratio with the mean value is observed to obey a linear relationship with different particle multiplicities except for shower particles where dispersion is almost independent of shower particles. Mean normalized multiplicity has also been studied in terms of created charged particles.

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Section: Resultsmentioning

confidence: 99%

A Study of Pion-Nucleus Interactions in terms of Compound Particles

Ahmad

2014

ISRN High Energy Physics

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“…The data taken under conditions of zero recoil momentum for the 3 H spectator could only be fitted by the DWIA if the calculations were normalized by a factor of ~ 0.5, except at 590 MeV where the calculations agreed fairly well with the data. 5 Since the 460-and 590-MeV data differed by a factor of 1.6 (see Fig. 1) and since there were no data between 156 and 460 MeV, the reaction *He(p,2p) 3 H was measured at 250, 350, and 500 MeV in an attempt to resolve the existing experimental ambiguity and to understand better the applicability of the DWIA to this reaction.…”

Section: Comparison Of the Reactionmentioning

confidence: 99%

“…3 Cascade development in nuclear matter appears to be suppressed relative to the predictions of a multiple, independent collision model (MICM) which treats the interaction as a series of quasifree particle-particle scattering events. 4 The collective tube model (CTM) 5 represents another approach to understanding such phenomena. A salient point in the CTM is that the incident particle sees a nucleus that is Lorentz contracted to a thin disk.…”

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confidence: 99%

Effects of Collectivity on Target-Fragmentation Reactions

Cumming¹

1980

Phys. Rev. Lett.

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A new approach based on the collective tube model is developed for understanding momentum transfer to target fragments in high-energy hadron-nucleus collisions. Collectivity manifests itself in an enhanced dependence of momentum transfer on projectile energy, consistent with experimental results for deep-spallation reactions. The effective target for 149 Tb production from 197 Au by high-energy protons is deduced to consist of 3.1 ± 0.4 nucleons. Extensions of this model to nucleus-nucleus collisions are discussed.Investigations of hadron-nucleus collisions at high energies offer possibilities for probing the space-time character of strong interaction processes at small distances. Experimental data have been interpreted as showing that asymptotic final states of the fastest secondary particles are reached only in distances <:10 fm, 1 and that the immediate product of a hadron-nucleon collision is a state similar to the incident hadron. 2 Such conclusions follow from the observed weak dependence of the number of secondary particles, i.e., the multiplicity, on nuclear size and projectile energy. 3 Cascade development in nuclear matter appears to be suppressed relative to the predictions of a multiple, independent collision model (MICM) which treats the interaction as a series of quasifree particle-particle scattering events. 4 The collective tube model (CTM) 5 represents another approach to understanding such phenomena. A salient point in the CTM is that the incident particle sees a nucleus that is Lorentz contracted to a thin disk. Consequently, nucleons in the path of the incident hadron can be viewed as acting collectively and in a first-order approximation can be considered as a single object, an effective target which may have a mass greater than that of an individual nucleon. Evidence of collectivity has been reported by Vary, Lassila, and Sandel, 6 who found that subthreshold p production data were more consistent with the predictions of the CTM than with those of an MICM which included effects of Fermi motion. While the CTM has been applied primarily to particle production, it has been speculated recently 7 * 8 that it might account for low momentum transfers and sidewardpeaked angular distributions of target-fragmentation products. In this Letter, the CTM is used to analyze quantitatively longitudinal momentum transfers to target fragments from hadron-nucleus collisions. It is shown that experimental data for a proton-induced deep-spallation reaction are consistent with an initial interaction involving several nucleons. Consider the single-particle inclusive reaction in which a projectile of mass m P9 momentum P, and total energy E interacts with a target m r . A mass Am is abraded from the target giving a prefragment (i.e., the precursor of the observed product) which recoils at an angle 0 to the beam direction with a momentum q. The remainder of the system is treated kinematically as a single object having mass w. This "missing mass" includes fragments of the projectile, the Am abraded nucleons, any pa...

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“…For the interaction of projectile with momentum plab the cumulative square of the center-of-mass energy is si @ 2imp lab (i is a number of nucleons, m-a nucleon mass). The paper [12] quantitatively described unusually strong A dependence (stronger than the commonly assumed A or A2/3) of the cross section for p+A® J/Y+X reaction at incident energies below 30 GeV, using cumulative effects (via energy rescaling).…”

Section: Resultsmentioning

confidence: 99%

Study of the Cumulative Number Distribution of Charged Particles Produced in p12C-Interactions at 4.2 A GeV/c

et al. 2017

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In this paper the behaviour of the cumulative number distribution and the maximum values of cumulative number in an event of all charged particles (protons,±-mesons) produced in p12C-interctions at 4.2 A GeV/c from experimental and simulation data has been analysed. One could see four different regions in the cumulative number distributions for protons in which the last region has cumulative number greater than one which correspond to cumulative region. Similarly one could see two and three different regions for negative and positive pions respectively but there is totally absence of the cumulative area for negative pions but there are few positive pions in the cumulative area. The simulation data obtained from Cascade code cannot describe satisfactorily the distributions of the cumulative number for protons and positive and negative pions but in case of particles with maximum values of cumulative number cascade code can describe the behaviour of cumulative number distribution well. The inverse of the slope for ε dσ/dp ~f(-x/) behaviour as a function of x has a universal value≅0.16.

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Multiparticle production in particle-nucleus collisions at high energies

Cited by 99 publications

References 19 publications

A Study of Pion-Nucleus Interactions in terms of Compound Particles

A Study of Pion-Nucleus Interactions in terms of Compound Particles

Effects of Collectivity on Target-Fragmentation Reactions

Study of the Cumulative Number Distribution of Charged Particles Produced in p12C-Interactions at 4.2 A GeV/c

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