Multiplicity Distributions of Secondary Charged Particles from Interactions of He-Fragments with Emulsion at 60 A GeV/c

Mettwalli, N.; Kelany, L.

doi:10.1143/jpsj.63.3273

Cited by 6 publications

(3 citation statements)

References 8 publications

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“…the probability distribution of obtaining a definite number of produced or emitted particles, still contains information about particle correlations. There have been several important observations and physics messages conveyed by scientists by studying the multiplicity distribution of produced or emitted particles using a variety of projectile beams with a wide span of energy in recent times [3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Target dependence of clan model parameters at Dubna energy-chaotic pion production

Bhattacharyya

Neagu

Firu

2013

J. Phys. G: Nucl. Part. Phys.

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A detailed study of clan model parameters and their target dependence has been carried out in the light of void probability scaling for heavy (AgBr) and light (CNO) groups of targets present in the nuclear emulsion using 22 Ne (at an incident momentum of 4.1 GeV/c), 28 Si (at an incident momentum of 4.5 GeV/c), 16 O (at an incident momentum of 4.5 GeV/c) and 32 S (at an incident momentum of 4.5 GeV/c) projectiles. The variation of scaled rapgap probability with the single moment combination has been studied for all of the interactions. The experimental points are found to lie approximately on the NBD curve for all of the interactions, indicating a scaling behavior. According to the two-source model of particle production, in the case of 32 S-AgBr interactions at 4.5 GeV/c, the pion production mechanism has been found to be almost chaotic. On the contrary, for all of the other interactions at 4.1-4.5 GeV/c, pion production is predominantly chaotic. Average clan multiplicities (N) for all of the interactions are found to increase with the increase in the pseudo-rapidity interval η. The values of N for the AgBr target are larger than those for the CNO target. The average number of particles per clan (n c ) increases initially with the increase in pseudo-rapidity interval. An approximate saturation of the values of n c is observed for 22 Ne and 16 O projectiles around η = 6. With the increase in projectile size, the saturation of n c seems to be wiped out. It can also be observed from the tables that for a particular target the average number of particles per clan (n c ) increases with the increase in the size of the projectile nucleus. A comparison with the results of the SPS data has also been presented.

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Section: Introductionmentioning

confidence: 99%

Target dependence of clan model parameters at Dubna energy-chaotic pion production

Bhattacharyya

Neagu

Firu

2013

J. Phys. G: Nucl. Part. Phys.

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“…the probability distribution of obtaining a definite number of produced or emitted particles, still contains information about particle correlations. There have been several important observations and physics messages conveyed by scientists by studying the multiplicity distribution of produced or emitted particles using a variety of projectile beams with a wide span of energy, in recent times [1][2][3][4][5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Multiplicity scaling of target protons in high-energy nucleus–nucleus and hadron–nucleus interactions

Ghosh

Deb

Bhattacharyya

et al. 2012

J. Phys. G: Nucl. Part. Phys.

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Multiplicity scaling of target protons emitted from nucleus-nucleus ( 16 O-AgBr interactions at 2.1 AGeV and 32 S-AgBr interactions at 200 AGeV), pionnucleus (π − -AgBr interactions at 350 GeV/c) and proton-nucleus interactions (p-AgBr interactions at 200 GeV/c) has been investigated. The experimental points are found to lie approximately on the curve described by ψ (z) = Az exp(−Bz) with A = 3.36 ± 0.19 and B = 1.74 ± 0.06 for all the four interactions. A comparison of the fit with the function ψ (z) = (Az + Bz 3 + Cz 5 + Dz 7 ) exp(−Ez) has also been performed.

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“…There have been several important observations and findings conveyed by scientists studying the multiplicity distribution of pions, projectile fragments and target fragments at different times using a variety of projectile beams with a wide range of energies [4][5][6][7][8][9][10][11][12][13][14]. It should be noted that emission of target fragments can happen both when θ Lab > 90 • and when θ Lab 90 • .…”

Section: Introductionmentioning

confidence: 99%

Characteristics of multiplicity distribution of target fragments in forward and backward hemispheres in high-energy nucleus–nucleus interactions

2011

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A detailed study on the mechanism of the evaporation of target fragments in the forward and backward hemispheres in 12 C-AgBr interactions at 4.5A GeV, 28 Si-AgBr interactions at 14.5A GeV, 16 O-AgBr interactions at 60A GeV and 32 S-AgBr interactions at 200A GeV is carried out in terms of the multiplicity distribution. The nature of the multiplicity distribution in the forward and backward hemispheres is found to be different across all the interactions. The asymmetry parameters and the forward-backward ratios were also calculated for the above-mentioned interactions. The asymmetry parameters and the forward-backward ratios from other nucleus-nucleus interaction data were compared with our results. The forward-backward ratios of target fragments are found to be nearly the same for all the nucleus-nucleus interactions. The forward-backward ratios of all the interactions are greater than 1, suggesting that the probability of emission of fragments in the forward hemisphere is higher than that in the backward direction. The multiplicity moment, entropy and reduced entropy, i.e. the ratio of entropy to average multiplicity of target fragments, are evaluated in both the forward and backward hemispheres for all the four above-mentioned interactions. The values of multiplicity moments are found to be energy independent up to 60A GeV energy in the backward hemisphere. The reduced entropy is also found to be almost energy independent to within experimental error in the backward hemisphere. No such observation can be made in the forward hemisphere. The total entropy of the target fragments is found to be higher in the forward hemisphere. A study of correlation in terms of the scaled variance was also carried out in both the hemispheres for all the nucleus-nucleus interactions. No systematic variation of correlation either with energy or with the size of the projectile nucleus has been noticed. The study yields quite interesting information on the mechanism of particle evaporation in the backward hemisphere.

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Multiplicity Distributions of Secondary Charged Particles from Interactions of He-Fragments with Emulsion at 60 A GeV/c

Cited by 6 publications

References 8 publications

Target dependence of clan model parameters at Dubna energy-chaotic pion production

Target dependence of clan model parameters at Dubna energy-chaotic pion production

Multiplicity scaling of target protons in high-energy nucleus–nucleus and hadron–nucleus interactions

Characteristics of multiplicity distribution of target fragments in forward and backward hemispheres in high-energy nucleus–nucleus interactions

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