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

摘要

The target excitation dependence of the degree of multifractality and critical exponent of pions produced for then16O-AgBr interaction at 60 AGeV has been investigated. To study target excitation dependence, the data for the producednpions were distributed into three sets, depending on the number of grey tracks (ng). The different sets correspond to thendifferent degrees of target excitation. The probability G-moments were used for the analysis in pseudorapidity space. Thenanalysis reveals that the produced particle density distribution possesses multifractal structure for all degrees of target exci-ntation (0 £ ng £ 3, 4 £ ng £ 7, and ng ‡ 8). The distribution Levy index and the phase transition critical exponent are calcu-nlated. The study indicates the non-thermal phase transition, but it does not show evidence for the second-order phasentransition