Features of CC interactions at a momentum of 4.2 GeV/c per nucleon for various degrees of nuclear-collision centrality

Bondarenko, A. I.; Bondarenko, R. A.; Galoyan, A.; Kladnitskaya, E.N.; Rogachevsky, O. V.; Uzhinskiǐ, V. V.

doi:10.1134/1.1446560

Cited by 27 publications

(19 citation statements)

References 16 publications

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“…After introducing all above mentioned corrections in the present analysis, we obtained the respective mean multiplicities to be 2 47 ± 0 05 and 1 83 ± 0 04, with a statistics of 6736 inelastic p + 12 C events. The mean multiplicity of participant protons ( lab > 300 MeV/c) calculated using Dubna Cascade Model (DCM) [61,62] and FRITIOF model [63][64][65][66][67] were 1 79 ± 0 01 [56] and 1 99 ± 0 02, respectively [60]. It should be mentioned that the broad peak observed in momentum distribution of protons in region ∼ 3 -4 GeV/c in Fig.…”

Section: The Experimental Proceduresmentioning

confidence: 99%

Analysis of Δ0(1232) production in collisions of protons with carbon nuclei at 4.2 GeV/c

Olimov¹,

Haseeb

Olimov

et al. 2011

Open Physics

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Abstract:The production of ∆ 0 (1232)-resonances in p+ 12 C collisions at 4.2 GeV/c was analyzed with 4π acceptance. The mass distribution of ∆ 0 (1232) was reconstructed using an angular criterion. The fraction of charged π − -mesons coming from ∆ 0 (1232) decay was estimated and compared to those obtained in earlier works. The momentum, transverse momentum, kinetic energy, and rapidity distributions as well as invariant cross sections of ∆ 0 (1232)-resonances were reconstructed in the laboratory frame. The mean kinematical characteristics of the reconstructed ∆ 0 (1232) were compared to those of participant protons in experiment and within some of the models. The freeze-out temperature of ∆ 0 (1232) estimated in the present analysis was compared with those obtained using different methods for ∆(1232) produced with other sets of colliding nuclei at various incident energies. The relative number of nucleons excited to ∆ 0 (1232) at freeze-out conditions in p+ 12 C collisions was estimated.

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Section: The Experimental Proceduresmentioning

confidence: 99%

Analysis of Δ0(1232) production in collisions of protons with carbon nuclei at 4.2 GeV/c

Olimov¹,

Haseeb

Olimov

et al. 2011

Open Physics

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“…For simulating the nucleon-nucleon and pion-nucleon interactions in QGSM, the binary, "undeveloped" cylindrical, diffractive, cylindrical and planar topological quark diagrams were used. [23][24][25][26] The binary processes give the main contribution to QGSM and correspond to a quark rearrangement (in interacting pair of nucleons) without direct particle emission in the string decay. This process mainly results in resonance production (for example, in reactions p + n → p + ∆ 0 , p + p → n + ∆ ++ , n + n → p + ∆ − , n + n → n + ∆ 0 , etc), and the resonances are the main source of pion production in QGSM.…”

Section: Experimental Procedures and Analysismentioning

confidence: 99%

“…In our experiment, the spectator protons are protons with momenta p > 3 GeV/c and emission angle θ < 4 • (projectile spectators), and protons with momenta p > 0.3 GeV/c (target spectators) in the laboratory frame. [23][24][25][26][27][28][29][30] These criteria are based on the fact that, having spin-1 /2, nucleons in nuclei posses Fermi momentum. Thus, practically all the spectator nucleons have momenta p n < p F max , where p F max is the maximum Fermi momentum in the nucleus rest frame, which is around 0.2-0.3 GeV/c for carbon and tantalum nuclei, taking into account the mean relative uncertainty of momentum measurement of protons ∆p p ≈ 11% in the present experiment.…”

Section: Experimental Procedures and Analysismentioning

confidence: 99%

On transverse momentum spectra of negative pions in ¹²C+¹⁸¹Ta collisions at 4.2A GeV/c

Olimov

Iqbal

Lutpullaev

et al. 2014

Int. J. Mod. Phys. E

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We studied the dependences of the experimental transverse momentum spectra of the negative pions, produced in minimum bias 12 C+ 181 Ta collisions at a momentum of 4.2 GeV/c per nucleon, on the collision centrality and the pion rapidity range. To examine quantitatively, the change in the shape of the pt spectra of π − mesons with the change of collision centrality and the pion rapidity range, all the extracted pt spectra were fitted by the four different functions commonly used for describing the hadron spectra.The extracted values of the spectral temperatures T 1 and T 2 were consistently larger for the pt spectra of π − mesons coming from midrapidity range as compared to those of the negative pions generated in the target and projectile fragmentation regions. The spectral temperatures of the negative pions coming from projectile fragmentation region proved to be larger than the respective temperatures of the negative pions coming from target fragmentation region. The extracted spectral temperatures T 1 and T 2 of the pt spectra of π − mesons were compatible within the uncertainties for the peripheral, semicentral and central 12 C+ 181 Ta collision events, selected using the number of participant protons. It was observed that Hagedorn and Boltzmann functions are more appropriate for describing the transverse momentum spectra of the negative pions as contrasted to Simple Exponential and Gaussian functions.

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“…The data were recorded with 2m Propane Bubble Chamber [12] , using criteria based on the determination of total charge of the secondaries, presence of slow Protons (with momentum P < 0.75 GeV/c) , Protons in backward hemisphere and negatively charged particles etc. as described in Refs.…”

Section: Experiments and Methodsmentioning

confidence: 99%

The study of light nuclei production in different interactions at 4.2 AGeV/c

et al. 2016

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Average multiplicity of light nuclei produced in different interactions at 4.2A GeV/c is studied as a function of centrality. A change in multiplicity is observed with increase in the mass of projectile. In 12 CC-interactions an unexpected increase in the multiplicity is seen for the most central events. These measurements are compared with the predictions of Cascade and Fritiof Models, which fail to account for the experimentally observed effects. In case of 12 CC, it is suggested that the inclusion of nuclear coalescence effect can be an explanatory reason for the differences between the experimental measurements and the models' predictions.

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Features of CC interactions at a momentum of 4.2 GeV/c per nucleon for various degrees of nuclear-collision centrality

Cited by 27 publications

References 16 publications

Analysis of Δ0(1232) production in collisions of protons with carbon nuclei at 4.2 GeV/c

Analysis of Δ0(1232) production in collisions of protons with carbon nuclei at 4.2 GeV/c

On transverse momentum spectra of negative pions in ¹²C+¹⁸¹Ta collisions at 4.2A GeV/c

The study of light nuclei production in different interactions at 4.2 AGeV/c

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Features of CC interactions at a momentum of 4.2 GeV/c per nucleon for various degrees of nuclear-collision centrality

Cited by 27 publications

References 16 publications

Analysis of Δ0(1232) production in collisions of protons with carbon nuclei at 4.2 GeV/c

Analysis of Δ0(1232) production in collisions of protons with carbon nuclei at 4.2 GeV/c

On transverse momentum spectra of negative pions in 12C+181Ta collisions at 4.2A GeV/c

The study of light nuclei production in different interactions at 4.2 AGeV/c

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On transverse momentum spectra of negative pions in ¹²C+¹⁸¹Ta collisions at 4.2A GeV/c