The percolation phase transition and statistical multifragmentation in finite systems

  • The cumulant ratios up to fourth order of the Z distributions of the largest fragment in spectator fragmentation following 107,124Sn+Sn and 124La+Sn collisions at 600 MeV/nucleon have been investigated. They are found to exhibit the signatures of a second-order phase transition established with cubic bond percolation and previously observed in the ALADIN experimental data for fragmentation of 197Au projectiles at similar energies. The deduced pseudocritical points are found to be only weakly dependent on the A/Z ratio of the fragmenting spectator source. The same holds for the corresponding chemical freeze-out temperatures of close to 6 MeV.The experimental cumulant distributions are quantitatively reproduced with the Statistical Multifragmentation Model and parameters used to describe the experimental fragment multiplicities, isotope distributions and their correlations with impact-parameter related observables in these reactions. The characteristic coincidence of the zero transition of the skewness with the minimum of the kurtosis excess appears to be a generic property of statistical models and is found to coincide with the maximum of the heat capacity in the canonical thermodynamic fragmentation model.

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Author:Tomasz Pietrzak, Alexander BotvinaGND, Janusz BrzychczykORCiD, Nihal BuyukcizmeciORCiDGND, Arnaud Le FèvreORCiD, Jarosław Łukasik, Piotr PawłowskiORCiD, Concettina SfientiORCiD, Wolfgang TrautmannGND, Andrzej WielochORCiD
Parent Title (German):Physics letters B
Place of publication:Amsterdam
Document Type:Article
Date of Publication (online):2020/09/03
Date of first Publication:2020/09/03
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2022/10/13
Tag:Heavy ion collisions; Percolation theory; Statistical multifragmentation models
Page Number:6
Institutes:Physik / Physik
Wissenschaftliche Zentren und koordinierte Programme / Frankfurt Institute for Advanced Studies (FIAS)
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoCreative Commons - Namensnennung 4.0