Intermittency in multiparticle production at ultra-relativistic heavy ion collisions

Sengupta, Kaushik; Jain, P. L.; Singh, G.; Kim, S.N.

doi:10.1016/0370-2693(90)90832-q

Cited by 83 publications

(34 citation statements)

References 15 publications

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“…A heavy fragment here is defined as a cluster with charge greater than the a particle. While checking the charge conservation, the pions were eliminated from the angle given by the Fermi momentum [7] at each interaction point.…”

Section: Intermittency In Nuclear Multifragmentation At Relativistic mentioning

confidence: 99%

Intermittency in nuclear multifragmentation at relativistic energy

1992

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The charge distribution of nuclear fragments for the nonfissile events of ^^'U at 0.96A GeV in nuclear emulsion is fitted with a power law. The method of scaled factorial moments is used to study fluctuations in the nuclear fragmentations. An intermittent behavior is found in the data, but no clear evidence of critical phenomenon is observed in nuclear fragmentation.PACS numbers: 24.60.Ky The recent studies of intermittency 111 in particle and nuclear collisions have revealed a quite fruitful field of research, and in fact the study of fluctuations has led to interesting insights on physical phenomena. Moreover, the intermittency analysis in terms of scaled factorial moments in relation with percolation models has been shown to be relevant in the study of the nuclear multifragmentation process [2]. In nuclear collisions at lower bombarding energies (<\A GeV) particle production is strongly suppressed and nuclear breakup into fragments dominates. Fragment-size distributions exhibit similar features to those known in percolation models [3]. Thus heavy-ion collisions offer a unique opportunity to study new phases of nuclei. One phase is of a high-density high-temperature region around the quark-gluon plasma (hadron phase transition or a thermal transition at equilibrium). The other phase is the low-density moderatetemperature region near the liquid-gas phase transition, but not at equilibrium-a nonthermal process. One can study the transition by looking at the distribution in composition of the final products. Here we shall look at the nonthermal process.In 1984, we did an analysis of nuclear interactions produced [4] in emulsion from ^^^U projectile at 0.96A GeV, in which 51% of all the 894 interactions were due to lissionlike fragments with a cross section of a^ ==1755 ± 82 mb. Recently, considerable interest has centered around the idea of nuclear multifragmentation, so our interest in the present Letter is to analyze the remaining nonfissile events which broke up into multifragments. When a ^^^U ion passes through the emulsion detector, the interactions in this medium were recorded up to ~ 2.7 cm (corresponding to energy between 960 and 240), where various processes are competing which give rise to different charge spectra of the projectile fragments (PFs). The energy of the produced PFs is high enough to distinguish them easily from the target fragments [5]. In each event the charges of these projectile fragments were determined by a combination of different methods which included grain density, gap density, <5-ray counting, relative track widths, etc. [4]. For projectile fragments of heavy charges which stopped in the stack, we used relations between their thin down track length and the widths [6] which were developed from the data of standard stopping tracks by drawing the profile of their last (150-1000 pm) thin down track lengths with the help of a special Leitz ''discussion tube" and comparing them with the profiles of unknown tracks of different charges. A heavy fragment here is defined as a cluster w...

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Section: Intermittency In Nuclear Multifragmentation At Relativistic mentioning

confidence: 99%

Intermittency in nuclear multifragmentation at relativistic energy

1992

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“…The data were obtained by exposing Illford G5 emulsion plates to a 60 AGeV 16 O beam at CERN SPS [21]. A Leitz Metallopan microscope with a 10Â objective and 10Â ocular lens with a semi-automatic scanning stage was used to scan the plates.…”

Section: Methodsmentioning

confidence: 99%

Target excitation dependence of degree of multifractality and critical exponent in ultrarelativistic nuclear collision

et al. 2010

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The target excitation dependence of the degree of multifractality and critical exponent of pions produced for the 16 O-AgBr interaction at 60 AGeV has been investigated. To study target excitation dependence, the data for the produced pions were distributed into three sets, depending on the number of grey tracks (n g ). The different sets correspond to the different degrees of target excitation. The probability G-moments were used for the analysis in pseudorapidity space. The analysis reveals that the produced particle density distribution possesses multifractal structure for all degrees of target excitation (0 n g 3, 4 n g 7, and n g 8). The distribution Levy index and the phase transition critical exponent are calculated. The study indicates the non-thermal phase transition, but it does not show evidence for the second-order phase transition.PACS Nos: 25.75-q, 25.70MnRésumé : Nous avons étudié la dépendance en excitation de la cible du degré de multifractalité et de l'exposant critique des pions produits dans l'interaction 16 O-AgBr à 60 AGeV. Afin d'étudier la dépendance d'excitation de cible, les données pour la production de pions sont regroupées en trois ensembles qui dépendent du nombre de traces grises (ng). Les diffé-rents ensembles correspondent à différents degrés d'excitation de la cible. Nous avons utilisé les moments G de probabilité pour faire l'analyse dans l'espace de pseudorapidité. Cette analyse révèle que la distribution de densité des particules produites a une structure multifractale pour tous les degrés d'excitation de la cible (0 ng 3, 4 ng 7 et ng 8). Nous calculons l'indice de Lévy de la distribution et l'exposant critique de la transition de phase. L'étude indique une transition de phase non thermique, mais ne montre aucune évidence d'une transition de phase du deuxième ordre.[Traduit par la Rédaction]

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“…This technique involves the computation of scaled factorial moments (SFMs) as a function of the decreasing phase space cells and this intermittent type of non-statistical fluctuation was thought to be the outcome of the transition from the quark-gluon plasma to normal hadronic matter and interest was centred around self-similarity studies. Later on, analyses of various accelerator-based data [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] were found to be consistent with the power-law and the results are not enough for the interpretation. Analysis of the experimental data in almost all the cases has been performed as SFMs which is the main tool for intermittency in different phase space variables.…”

Section: Introductionmentioning

confidence: 93%

Multiplicity fluctuations of pions and protons at SPS energy — An in-depth analysis with factorial correlator

et al. 2009

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We compute the factorial correlators to study the dynamical fluctuations of pions and a combination of pions and protons (compound multiplicity) in 32 S-AgBr interactions at 200 A GeV. The study reveals that for both pion and compound multiplicity the correlated moments increase with the decrease in bin-bin separation D, following a power-law, which suggests the self-similarity of multiplicity fluctuation in each case. The results of the analysis also show a consistency with the prediction of α-model for the existence of intermittency in both cases.

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Intermittency in multiparticle production at ultra-relativistic heavy ion collisions

Cited by 83 publications

References 15 publications

Intermittency in nuclear multifragmentation at relativistic energy

Intermittency in nuclear multifragmentation at relativistic energy

Target excitation dependence of degree of multifractality and critical exponent in ultrarelativistic nuclear collision

Multiplicity fluctuations of pions and protons at SPS energy — An in-depth analysis with factorial correlator

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