Target Excitation Dependence Research Articles

Chaos in multiparticle production in 16O–AgBr interactions at 60 A GeV and its target excitation dependence

Chaos in multiparticle production in 16O–AgBr interactions at 60 A GeV and its target excitation dependence

Target excitation-dependent erratic fluctuation of pions in hadron–nucleus interactions

In this paper we studied the target excitation dependence of erratic behavior of rapidity gaps in p–AgBr interactions at 400 GeV/c and π−–AgBr interactions at 200 and 350 GeV/c. We estimated the entropy-like quantity Sq. The study reveals a positive indication of the erratic nature of event-to-event fluctuations in relativistic hadron–nucleus interactions, and the fluctuation pattern depends on the degree of target excitation for all the interactions.

Fluctuation of fluctuations in pionisation: Target excitation dependence

This paper presents some interesting and informative results of experimental investigation on target excitation dependence of fluctuation of fluctuations studies on produced pions emitted in 16O-AgBr interactions at 60 AGeV and 32S-AgBr interactions at 200 AGeV. A search for the possible signature of chaotic behavior of multiparticle production in nucleus-nucleus collision has been performed with the help of entropy index, μq. To study the target excitation dependence of the chaotic behavior, the whole dataset is divided into subsamples having different number of recoil target protons which may be considered as a measure of target excitation.

Target excitation dependence of self-similar cascading rate in multihadron production process at 350 GeV

In the present work target excitation dependence of the self-similar cascading rate has been studied in detail in the framework of Levy stable law using the experimental data of pions obtained from π−-AgBr interactions at 350 GeV/c. TheLevy indices µ measured from the analysis fulfill the requirement of the Levy stable region 0 ⩽ µ ⩽ 2. The study gives an evidence of self-similar cascading mechanism responsible for multiparticle production. The different values of µ indicate different rates of cascading for different degrees of target excitation. Moreover, the values of universal scaling exponent (ν) obtained from Ginzburg-Landau theory indicate that no clear evidence of second-order phase transition has been found in the interaction.

Target Excitation Dependence of Self-Similar Cascading Rate in Multihadron Production Process at 350 GeV

Target Excitation Dependence of Self-Similar Cascading Rate in Multihadron Production Process at 350 GeV

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

The target excitation dependence of the degree of multifractality and critical exponent of pions produced for the 16O-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 (ng). 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 ≤ ng ≤ 3, 4 ≤ ng ≤ 7, and ng ≥ 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.

NONMONOTONIC TARGET EXCITATION DEPENDENCE OF PION CLANS IN RELATIVISTIC NUCLEUS–NUCLEUS COLLISIONS

Target excitation dependence of fluctuation of produced pions (i.e. classifying data of the fluctuation pattern on pions on the basis of the number of gray tracks) is studied for nucleus–nucleus collisions at different projectile energies. In each set the experimental multiplicity distribution is compared with the negative binomial distribution (NBD), which is found to describe the experimental distribution quite well. Target excitation dependence is studied in respect of the clan model parameters [Formula: see text] and [Formula: see text], which are extracted from the NBD fit parameters [Formula: see text] and k. A detailed comparison between different interactions at the same energy and the same interactions at different energies is also drawn. A nonmonotonic dependence of [Formula: see text] on 〈ng〉 is revealed, which is also a characteristic of multiplicity fluctuations at RHIC data.

Pionization at AGS and SPS energies ― degree of coherence and its target excitation dependence

The target excitation dependence of the higher order cumulant correlation of pions is studied in the present work in the framework of void probability scaling. The data set of pions produced for16O–AgBr interactions at 2.1 AGeV and32S–AgBr interactions at 200 AGeV was divided into three sets depending upon the number of grey tracks ng. The different sets of ngcorrespond to different degrees of target excitation. Analysis was carried out for each set in different pseudorapidity intervals. For the lower projectile energy the void probability scaling is observed only for low target excitation for all pseudorapidity intervals. For the comparatively higher projectile energy, scaling is observed for all pseudorapidity intervals and all target excitation. In other words, for higher projectile energy, scaling is almost independent of the target excitation. The results are interpreted from the point of view of the two source model of particle production.

Target excitation dependence of the entropy index in 350 GeV/c π−–AgBr collisions

In this paper a detailed study on the erratic behaviour of multiparticle production in π−–AgBr interactions at 350 GeV has been performed with the help of the parameter ‘entropy index’ μq, which is a measure of chaotic behaviour in multipion production processes. This index describes the event-to-event fluctuation of factorial moments which measures the spatial fluctuation of multiplicity distribution. The analysis reveals a large value for the entropy index, signifying the chaotic behaviour of the produced pions in high-energy hadron–nucleus interactions. It has been observed that the multipion production process becomes less chaotic with an increasing average multiplicity of the final states. The study has further been extended to know the target excitation dependence of chaoticity of pions; a positive dependence is indicated by the data.

MULTIFRACTALITY AND MULTIFRACTAL PIONIC SPECIFIC HEAT IN NUCLEAR COLLISIONS — TARGET EXCITATION DEPENDENCE

This paper deals with the target excitation dependence of the multifractal specific heat of pions produced in nucleus-nucleus collisions at 60 and 200 AGeV. Fluctuation pattern of pions is studied in two dimensions considering anisotropy of phase space. The parameter characterizing the anisotropy of phase space, Hurst exponent, is extracted by fitting one-dimensional factorial moment saturation curves. Values of intermittency exponent αq and generalized dimension Dq are determined. The fluctuation pattern reveals multifractal behavior at all target excitations at both energies. The multifractal specific heat c is found to depend on target excitation and the dependence is found to be more pronounced at lower energy. The results are discussed in detail.

Higher order correlation of the pions and their target excitation dependence in relativistic and ultrarelativistic nuclear collisions

The target excitation dependence of higher order correlation of the pions is investigated in the present work using the data of 16O–AgBr interactions at 2.1 and 60 A GeV and 32S–AgBr interactions at 200 A GeV. The data are divided into different sets of ng which correspond to different degrees of the target excitation. The target excitation dependence was evident at the lower projectile energy—at the higher projectile energy no target excitation dependence was revealed by the data.

Target excitation dependence of pion fluctuation in relativistic heavy ion collision at 2.1 and 60 AGeV

This paper studies the dependence of a fluctuation pattern of produced pions on the target excitation for 16O–AgBr interactions at 2.1 and 60 AGeV. For studying target excitation dependence, the data for produced pions are distributed into three sets depending on the number of grey tracks (ng). The different sets correspond to the different degrees of target excitation. We have investigated the fluctuation pattern of emitted pions corresponding to different sets in both η (pseudo-rapidity) and ϕ (azimuthal angle) space. The effective fluctuation strength is calculated for each set for both η and ϕ space. The study reveals that the fluctuation pattern of pions depends on target excitation and the dependence is more pronounced at the lower projectile energy.

Excitation energy dependence of pion fluctuation: an in-depth study

This paper investigates the so-called excitation energy dependence (i.e. classification of fluctuation pattern of pions on the basis of number of grey tracks) at different projectile energies. The different data sets thus obtained correspond to different degrees of target excitation. The fluctuation pattern of pions is studied in two dimensions considering anisotropy of phase space. The parameter characterizing the anisotropy of phase is the Hurst exponent. The analysis is performed using a very rigorous method by fitting one-dimensional second-order factorial moment saturation curves. The study reveals that the effective fluctuation strength depends on target excitation. It is also observed that the target excitation dependence of fluctuation of pions is different at different projectile energies. Recent investigations of the RHIC data have revealed the fact that the behaviour of multiplicity fluctuations with collision centrality is non-monotonic. Our investigation also reveals the same fact.