Correlations among secondary particles in nucleon-light-nucleus interactions at cosmic-ray energies

Shivpuri, R. K.; Gupt, Chandra

doi:10.1103/physrevd.17.1778

Cited by 6 publications

(2 citation statements)

References 12 publications

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“…The low value of 0c reflects a weak dependence of R on A. This is in agreement with earlier results [12] obtained from rapidity gap measurements in p-emulsion nuclei interactions at cosmic ray energies. The weak dependence of R on A shows that the nucleus becomes transparent at very high energies.…”

Section: R and Its Dependence On Target Masssupporting

confidence: 90%

Some characteristics of high multiplicity (?45) proton-AgBr interactions at 800 GeV

Soni

Malik

Shivpuri

1994

Z. Physik A - Hadrons and Nuclei

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Abstract.Experimental results on some characteristics of high multiplicity (>45) proton-AgBr interactions at 800 GeV are presented. The results are compared with those in lower multiplicity regions as well as for CNO target. The various parameters investigated here are pseudorapidity distribution, mean normalised multiplicity, mean number of intranuclear collisions and normalised pseudorapidity. PACS: 13.85.Hd; 12.90.+b; 29.40.Rg In~oducfionThe space time development of hadron production in hadron-nucleus interaction is invaluable as it provides deeper insight into the fundamental strong interaction processes. Considerable work has been done on protonnucleus interactions upto 800 GeV [1][2][3][4][5][6][7][8][9][10], which is presently the highest energy for fixed targets. Most of these investigations have been carried out for all event multiplicities. Since in high energy interactions, majority of the collisions are peripheral, hence the thrust of the investigations so far has been on these collisions. It would be interesting to study the central collisions (high multiplicity/high momentum transfer events) and also determine if event characteristics are modified, if any, due to high momentum transfer of the collisions. With this aim in view, we study here the characteristics of interactions with multiplicity >=45 in 800 GeV proton interactions with AgBr nuclei. A parameter which reflects the mechanism of multiparticle production is the multiplicity of secondary particles. The other important feature of this parameter is that its value can be accurately determined. The present investigation is confined primarily to the studies of multiplicity, multiplicity correlations, the number of intranuclear collisions and differential multiplicity in the rarely occurring high multiplicity p-AgBr interactions at 800 GeV. ExperimentA stack of 40 Ilford G5 emulsion pellicles of dimension 10 cm • 8 cmx 0.06 cm was exposed to a proton beam of energy 800 GeV at Fermilab. The beam flux was 8.7 • 104 particles/cm 2 and the dispersion of the primary was < 0.05%. The emulsion plates were carefully area scanned for inelastic events. All events were area scanned twice by each observer and the average efficiency for detecting events was found to be 96%. Scanning was done at a distance of 1 cm from the leading edge of the emulsion, so that there was no interaction due to a secondary track. In order to select events due to primary protons the incident particle should make an angle < 2 ~ with mean beam direction. Events lying up to 25 gm from the surface or glass side of the emulsion pellicle were not considered. Using the above criteria, a total of 2317 events were obtained. Following the emulsion terminology [11] secondary particles with fl (v/e) >= 0.7 and fl < 0.7 were designated as shower and heavy tracks respectively. It was convenient to further subdivide the heavy ionising tracks into black and grey tracks, whose multiplicities were designated as Nb and Ng respectively. The black tracks resulted from secondary particles with specifi...

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Section: R and Its Dependence On Target Masssupporting

confidence: 90%

Some characteristics of high multiplicity (?45) proton-AgBr interactions at 800 GeV

Soni

Malik

Shivpuri

1994

Z. Physik A - Hadrons and Nuclei

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“…Several investigators (1)(2)(3)(4)(5)(6)(7)(8)(9)(10) have attempted to investigate the dynamics of cluster production in hadron-hadron and hadron-nucleus interactions at cosmic ray energies. These studies have revealed that the particles tend to form clusters in the intermediate stage, prior to their decay as shower particles.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of clusters produced in particle–nucleus interactions at 24, 50, and 400 GeV

Khushnood¹,

Shakeel²,

Irfan³

et al. 1985

Can. J. Phys.

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Some useful and interesting characteristics of clusters produced in 24 and 400 GeV p-nucleus and 50 GeV a--nucleus interactions have been investigated. The maximum number of charged shower pions constituting a cluster is three at 24 GeV, whereas at 50 GeV and beyond, this number is observed to be four. Further, the results reveal that the cluster size is independent of the star size, nature, and energy of the incident hadron beyond 50 GeV projectile energy. This observation is in accord with the "big hadron" approach suggested for explaining multiparticle production where the centre of the nucleus is visualized to behave like a "big hadron" and the interaction is envisaged to proceed via hadron -"big hadron" collisions. On a CtudiC certaines caractkristiques utiles et intkressantes des amas produits lors des interactions entre noyaux et protons de 24 et 400 GeV, ainsi qu'entre noyaux et a-de 50 GeV. Le nombre maximum de pions chargCs constituant un amas est trois a 24GeV, alors qu'i 50 GeV et au-dela, on observe que ce nombre est Cgal i quatre. Les rCsultats rCv&lent de plus que la grosseur de l'amas est indipendante de la grosseur de I'Ctoile, ainsi que de la nature et de I'tnergie du hadron incident lorsque I'Cnergie du projectile dCpasse 50 GeV. Cette observation est en accord avec I'approche "gros hadron" suggCrCe pour expliquer la production de particules multiples, approche dans laquelle on considere que le centre du noyau se comporte comme un "gros hadron" et que I'interaction procede par collisions entre hadrons et "gros hadrons."[Traduit par le journal]Can.

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Multiplicity and multiplicity correlations in 800 GeV proton-emulsion nucleus interactions

Shivpuri¹,

Prasad²

1989

Phys. Scr.

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Experimental results on the multiplicity distributions and correlations between various types of secondary particles are presented for 800 GeV proton-emulsion nucleus interactions. The results indicate strong correlation between the shower and the grey particles and an independence of the normalised multiplicity with respect to the target mass. The number of grey particles in an interaction is found to be the best experimental measure of the number of intranuclear collisions.

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Correlations among secondary particles in nucleon-light-nucleus interactions at cosmic-ray energies

Cited by 6 publications

References 12 publications

Some characteristics of high multiplicity (?45) proton-AgBr interactions at 800 GeV

Some characteristics of high multiplicity (?45) proton-AgBr interactions at 800 GeV

Characteristics of clusters produced in particle–nucleus interactions at 24, 50, and 400 GeV

Multiplicity and multiplicity correlations in 800 GeV proton-emulsion nucleus interactions

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