Energy dependence for relativistic hadron emission from <sup>32</sup>S nuclear collisions

Abdelsalam, A.; Badawy, B. M.; Hafiz, M. E.

doi:10.1139/p2012-048

Cited by 8 publications

(6 citation statements)

References 31 publications

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“…This strong dependence is evaluated linearly using equation ( 4) and is presented in figure 3 by the straight lines. Irrespective of the projectile size (A Proj = 1 to 32) and energy (2.1 to 200A GeV), the backward relativistic hadrons are produced with probability values of ∼20% to 30% for interactions with the Em target [36]. The theoretical predictions of the FRITIOF model slightly overestimate the data.…”

Section: Backward Relativistic Particle Productionmentioning

confidence: 93%

“…In experiments [18,19] the central collisions of 12 C, 16 O, 36 Ar, and 84 Kr with emulsion nuclei were studied at 50 to 220A MeV. At this range of intermediate energies the chance of pion creation is low.…”

Section: Mass Dependence Of the Collision Systemmentioning

confidence: 99%

“…Our group 4 carried out a series of experiments [10,[12][13][14][15][16][33][34][35][36][37] looking at backward relativistic hadron production. The results show that those hadrons are not created particles.…”

Section: Pion Production In Bhsmentioning

confidence: 99%

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Target size dependence of relativistic hadron emission from³²S nuclear collisions at 3.7 and 200AGeV

Abdelsalam¹,

Badawy²,

Hafiz³

2012

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

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The behavior of the relativistic hadron (shower particle) multiplicity for 32 S-nucleus interactions is investigated. The experiment is carried out at 3.7A GeV (Dubna energy) and 200A GeV (SPS energy) to search for the incident energy effect on the interactions inside the different emulsion target nuclei. Data are presented in terms of the number of emitted relativistic hadrons in both forward and backward angular zones. The dependence on the target size is presented. For this purpose the statistical events are separated into groups according to the interactions with H, CNO, Em, and AgBr target nuclei. The separation of events, into these groups, is executed based on predictions of Glauber's multiple scattering theory. Features suggestive of a decay mechanism seem to be a characteristic of the backward emission of relativistic hadrons. The results strongly support the assumption that the relativistic hadrons may already be emitted during the de-excitation of the excited target nucleus, in a behavior like that of compound nucleus disintegration. Regarding the limiting fragmentation hypothesis beyond 1 GeV, the target size is the main parameter affecting the backward production of relativistic hadrons. The backward shower particle multiplicity can indicate the impact parameter. The incident energy is a principle factor responsible for the forward relativistic hadron production, implying that this system of particle production is a creation system. However, the target size is an effective parameter as well as the projectile size considering the geometrical concept seen in the nuclear fireball model. The forward shower particle multiplicity distributions may behave in a similar trend at Dubna energy and SPS for low target sizes. For heavy target sizes, the SPS energy reveals the creation of hadrons with nearly equal probabilities over a wide range of multiplicity, extending to more than 300 hadrons per event. The data are analyzed in the framework of the FRITIOF model.

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Section: Backward Relativistic Particle Productionmentioning

confidence: 93%

Section: Mass Dependence Of the Collision Systemmentioning

confidence: 99%

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Target size dependence of relativistic hadron emission from³²S nuclear collisions at 3.7 and 200AGeV

Abdelsalam¹,

Badawy²,

Hafiz³

2012

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

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“…In Experiment [47], 32 S collisions with emulsion nuclei, at two widely separated beam energies of 3.7A and 200 A GeV are studied to examine the behavior towards hadronization process. In Experiment [48], the same interactions are utilized to examine the target size dependence in the production of the forward and backward emitted relativistic hadrons in the framework of the Lund Monte-Carlo program code-events generating FRITIOF model [49][50][51].…”

Section: Commentmentioning

confidence: 99%

Multiplicity characteristics in relativistic²⁴Mg-nucleus collisions

Abdelsalam¹,

Shaat²,

Abou-Moussa³

et al. 2013

Chinese Phys. C

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This work is concerned with the analyses of the shower and gray particle production in 4.5 A GeV/c 24 Mg collision with emulsion nuclei. The highest particle production occurs in the region of the low impact parameters. While the multiplicity of the shower particles emitted in the forward direction depends on the projectile mass number and energy, the multiplicity of the backward ones shows a limiting behaviour. The source of the emission of the forward shower particles is completely different from that of the backward ones. The target fragments are produced in a thermalized system of emission.

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“…El-Nadi et al [5][6][7] showed that the backward emitted pion multiplicity is strongly correlated with the target fragment multiplicity at Dubna energy. The pion production was investigated in relativistic and ultrarelativistic collisions, underlying their zonal emission influence at, θ lab <90 • , forward hemisphere (FHS) [8][9][10][11][12]. These results suggested that the forward emitted pions originate from a source of particle creation system as a result of a fireball nuclear matter or hadronic matter decay.…”

Section: Introductionmentioning

confidence: 99%

System size dependence in backward relativistic hadron production in pA and AA collisions

Badawy¹

2014

Chinese Phys. C

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In this comprehensive study the multiplicity characteristics of the backward emitted relativistic hadron (shower particle) through hadron-nucleus and nucleus-nucleus are overviewed in three dimensions. These dimensions are the projectile size, target size, and energy. To confirm the universality in this production system, wide ranges of system size and energy (E lab ∼2.1 A up to 200 A GeV) are used. The multiplicity characteristics of this hadron imply a limiting behavior with respect to the projectile size and energy. The target size is the main effective parameter in this production system. The exponential decay shapes is a characteristic feature of the backward shower particle multiplicity distributions. The decay constant changes with the target size to be nearly 2.02, 1.41, and 1.12 for the interactions with CNO, Em, and AgBr nuclei, respectively, irrespective of the projectile size and energy. While the backward production probability and average multiplicity are constants at different projectile sizes and energies, they can be correlated with the target size in power law relations.

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Energy dependence for relativistic hadron emission from ³²S nuclear collisions

Cited by 8 publications

References 31 publications

Target size dependence of relativistic hadron emission from³²S nuclear collisions at 3.7 and 200AGeV

Target size dependence of relativistic hadron emission from³²S nuclear collisions at 3.7 and 200AGeV

Multiplicity characteristics in relativistic²⁴Mg-nucleus collisions

System size dependence in backward relativistic hadron production in pA and AA collisions

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Energy dependence for relativistic hadron emission from 32S nuclear collisions

Cited by 8 publications

References 31 publications

Target size dependence of relativistic hadron emission from32S nuclear collisions at 3.7 and 200AGeV

Target size dependence of relativistic hadron emission from32S nuclear collisions at 3.7 and 200AGeV

Multiplicity characteristics in relativistic24Mg-nucleus collisions

System size dependence in backward relativistic hadron production in pA and AA collisions

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Energy dependence for relativistic hadron emission from ³²S nuclear collisions

Target size dependence of relativistic hadron emission from³²S nuclear collisions at 3.7 and 200AGeV

Target size dependence of relativistic hadron emission from³²S nuclear collisions at 3.7 and 200AGeV

Multiplicity characteristics in relativistic²⁴Mg-nucleus collisions