Mitali Mondal

FRACTAL BEHAVIOR OF NUCLEAR FRAGMENTS IN HIGH ENERGY INTERACTIONS

The multifractal analysis of data on nuclear fragments obtained from 28Si-AgBr interactions at 14.5 A GeV is performed using three different methods (the factorial moments, G-moments and Takagi moments). The generalized fractal dimensions Dq is determined from all these methods. Data reflects multifractal geometry for the nuclear fragments. From the knowledge of Dq, the multifractal specific heat is calculated for this data and also for 16O-AgBr interactions at 60 A GeV and 32S-AgBr interactions at 200 A GeV.

EVIDENCE OF FRACTAL BEHAVIOR OF PIONS AND PROTONS IN HIGH ENERGY INTERACTIONS — AN EXPERIMENTAL INVESTIGATION

Different fractal methods (Factorial moment, Takagi moment) have been used for the analysis of fractal behavior of multiparticle production in π--AgBr interaction at 350 GeV/c of compound multiplicity distribution in emission angle (cos θ) space and azimuthal angle (ϕ) space. The generalized fractal dimensions Dq are determined according to two methods. Results indicate multifractal behavior in compound multiplicity distribution. From the knowledge of Dq, the multifractal specific heat is calculated. Results are compared with the corresponding results of shower multiplicity.

Multiplicity-dependent chaotic pionization in ultra-relativistic nuclear interactions

The fluctuation of spatial patterns from event to event has been investigated by analysing the pionization data of 32S–AgBr interactions at 200 A GeV in terms of a new parameter entropy index, μq, which is a measure of chaotic behaviour in multipion production process. It is observed that the multipion production process becomes more chaotic with the increase of average multiplicities of the final states.

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.

Multidimensional erraticity analysis in ultra-relativistic nuclear collisions

This work reports a detailed study on multidimensional erraticity analysis on 32S–AgBr interactions at 200 A GeV. A general scaling law between the erraticity moments with phase-space partition number is observed. The analysis reveals the true picture of chaotic pion production.

Void fluctuation study of compound hadrons: Signatures of quark-hadron phase transition

Signatures of quark-hadron phase transition are probed by the investigation of event-by-event fluctuations of hadronic patterns in heavy-ion collisions. This study intend to measure the event-to-event fluctuation of voids (non-hadronic regions) for the experimental data sets of compound hadrons of 32S-AgBr interactions at 200 AGeV. The bin size dependence of voids is numerically evaluated with two different moments 〈G q 〉 and S q defined by R.C. Hwa and Q.H. Zhang. The scaling behaviour of the voids provides an efficient way to use the scaling exponents γ q and σ q to characterize the various interesting properties of the hadronic phase transition.

Chaos analysis of nuclear fragments in high energy collisions

This paper deals with fixed target AGS and SPS data of beam energies 14.5 and 200 A GeV respectively. A detailed study on chaos in the nuclear fragmentation process of 28Si–AgBr interactions at 14.5 A GeV and 32S–AgBr interactions at 200 A GeV has been performed using a new parameter, the entropy index. The analysis provides new data on the evidence of the erratic behavior of the target fragments signifying chaotic target fragmentation and also quantify the measure for chaos in high and ultra-high energy heavy-ion interactions. Further, it is also observed that the target fragmentation process becomes less chaotic with the increase of average multiplicities of the final states.

Forward–backward multiplicity correlations in ring like and jet like events in

We have studied the forward–backward correlations of charged-particle multiplicities in symmetric bins in pseudorapidity space in order to gain insight into the underlying correlations structure of particle production in case of ring-like and jet-like events of 16O–AgBr interactions at 60 AGeV. The variance σc2 of a suitably defined the forward-backward asymmetry variable C has been determined. The experimental results confirm correlations of the produced particles in the forward and the backward pseudorapidity region for both ring-like and jet-like events.