Multiplicity fluctuations of target residues in forward and backward hemispheres in 12C–AgBr interactions at 4.5 A GeV

Abstract

An investigation on the nature of dynamical fluctuations of target-evaporated slow particles emitted in 12C–AgBr interactions at 4.5 A GeV is carried out in both forward and backward emission angular zones in the framework of multidimensional factorial moment methodology considering the anisotropicity of the (cos θ–ϕ) phase space using the concept of the Hurst exponent (H). Our analysis reveals the presence of self-affine dynamical fluctuations in both the forward and backward emission angular zones. We have compared our results with those obtained from Monte Carlo simulated events. Non-intermittent behavior is observed for those simulated events in both the hemispheres. This observation confirms that the experimental data analysis reveals the true dynamical signal. Evidence of multifractality is also observed in both the hemispheres. We have also calculated the effective fluctuation strength to quantify the dynamical fluctuations in the case of 12C–AgBr interactions at 4.5 A GeV. The effective fluctuation strength is found to be higher in the backward hemisphere for our data. Stronger fluctuations in the backward hemisphere indicate the side splash phenomenon in the target fragmentation of 12C–AgBr interactions at 4.5 A GeV. Effective fluctuation strengths calculated from other nucleus–nucleus interactions data have also been compared with our result.