The temperatures of protons andπ − mesons in central nucleus-nucleus interactions at a momentum of 4.5 GeV/c per incident nucleon

Chkhaidze, L.; Dzobava, T.; Kharkhelauri, L.; Tuliani, I.; Okonov, E.O.; Vardenga, G.; Taran, G.G.

doi:10.1007/bf01566646

Cited by 22 publications

(7 citation statements)

References 20 publications

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“…The trigger mode for each exposure is defined as T(Θ ch ,Θ n ) (where Θ ch ,Θ n are expressed in degrees and rounded to the closest integer value). Thus Mg-Mg interactions obtained on this set-up correspond to the trigger T (2,2). The fraction of such events is ≈ 4·10 −4 among all inelastic interactions.…”

Section: Methodsmentioning

confidence: 70%

“…In previous articles [1,2] we studied the characteristics of π − mesons in collisions of various pairs of nuclei (He-Li, He-C, C-C, C-Ne, O-Ne, Ne-Ne, C-Cu, C-Pb and O-Pb) and also the results based on the part of experimental data of Mg-Mg interactions (1390 interactions, 10414-π − mesons ) had been obtained. In paper [3] a good agreement of the CASIMIR (CAScade Intranuclear Made In Rossendorf) cascade model calculations with Mg-Mg interactions (6239 collisions -50750 π − mesons) experimental data on inclusive characteristics and correlations of secondaries was shown.…”

Section: Introductionmentioning

confidence: 99%

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The comparison of characteristics of π− mesons produced in central Mg-Mg interactions with the quark gluon string model predictions

Chkhaidze

Djobava

Kharkhelauri

et al. 1998

EPJ A

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A detailed study of pion production in central Mg-Mg collisions at a momentum of 4.3 GeV/c per incident nucleon was carried out with use of the setup GIBS. The average kinematical characteristics of pions (multiplicity n − , momentum P , transverse momentum P T , emission angle Θ, rapidity Y ) and corresponding distributions have been obtained. The experimental results have been compared with the predictions of the Quark Gluon String Model (QGSM) and satisfactory agreement between the experimental data and the model has been found. The QGSM reproduces also the dependence of average P T on n − .The temperatures of π − mesons have been estimated in the rapidity interval of 0.5≤Y≤2.1. A satisfactory fit for π − mesons had been achieved by using a form involving two temperatures T 1 and T 2 . It was found that the QGSM underestimates T 2 by (10 − 15)%. The data have been analyzed using the transverse momentum technique. The observed dependence of the < P x ′ (Y ) > on Y shows the S-shape behaviour. The slope at midrapidity F has been determined. The QGSM reproduces the < P x > distribution satisfactorily, but underestimates the parameter F . PACS

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Section: Methodsmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

The comparison of characteristics of π− mesons produced in central Mg-Mg interactions with the quark gluon string model predictions

Chkhaidze

Djobava

Kharkhelauri

et al. 1998

EPJ A

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“…The temperatures of the negative pions have been extracted and analyzed for collisions of different sets of nuclei at various energies in the past. 12,[14][15][16][17][18] Analysis of transverse momentum as well as transverse mass distributions is preferred for estimating the hadron temperatures, due to their Lorentz invariance with respect to longitudinal boosts. 14,17,19,20 Hence, transverse momentum distributions have much lesser likelihood of getting affected by the longitudinal collective motion as contrasted to the energy spectra of hadrons.…”

Section: -2mentioning

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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“…(8), the distribution of π 0 → 2γ decay is determined by the dσ π /dE π of the intermediate π 0 -mesons given in Eq. (15) and by the kinematics of their decay: Chkhaidze et al [76] Here, the quantity Y γ is:…”

Section: B Differential Cross Section Dσπ/deπmentioning

confidence: 99%

Parametrization of the nucleus-nucleus γ -ray production cross sections below 100 GeV/nucleon: Subthreshold pions and hard photons

Kafexhiu

2016

Phys. Rev. C

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"Subthreshold pions" and so-called "hard photons" are two important channels for producing less than 1 GeV γ-rays and e ± pairs from nuclear collisions with energy per nucleon below the π-meson production threshold. I use publicly available experimental data to parametrize these two channels' γ-ray and e ± production cross sections and extend the pion contribution to these particles spectra at higher energies using their corresponding spectra from pp interactions. These parametrizations are valid for collision energy Tp ≤ 100 A GeV and agree reasonably well with the available experimental data. The new parametrizations allow, for the first time, accurate studies of astrophysical γ-rays below 1 GeV.

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The temperatures of protons andπ − mesons in central nucleus-nucleus interactions at a momentum of 4.5 GeV/c per incident nucleon

Cited by 22 publications

References 20 publications

The comparison of characteristics of π− mesons produced in central Mg-Mg interactions with the quark gluon string model predictions

The comparison of characteristics of π− mesons produced in central Mg-Mg interactions with the quark gluon string model predictions

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

Parametrization of the nucleus-nucleus γ -ray production cross sections below 100 GeV/nucleon: Subthreshold pions and hard photons

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The temperatures of protons andπ − mesons in central nucleus-nucleus interactions at a momentum of 4.5 GeV/c per incident nucleon

Cited by 22 publications

References 20 publications

The comparison of characteristics of π− mesons produced in central Mg-Mg interactions with the quark gluon string model predictions

The comparison of characteristics of π− mesons produced in central Mg-Mg interactions with the quark gluon string model predictions

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

Parametrization of the nucleus-nucleus γ -ray production cross sections below 100 GeV/nucleon: Subthreshold pions and hard photons

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