Dynamical and statistical bimodality in nuclear fragmentation
نویسندگان
چکیده
منابع مشابه
Bimodality in spectator fragmentation
This work has been motivated by the presently ongoing discussion of whether bimodality in the thermodynamic sense can be observed in fragmentation reactions and whether one can argue in favour of its providing direct evidence for the first-order character of the nuclear liquid-gas phase transition [1]. Bimodality occurs if non-negligible surface interactions at the phase boundary lead to a conv...
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The concept of freeze out volume used in many statistical approaches for disassembly of hot nuclei leads to ambiguities. The fragmentation pattern and the momentum distribution (temperature) of the emanated fragments are determined by the phase space at the freeze-out volume where the interaction among the fragments is supposedly frozen out. However, to get coherence with the experimental momen...
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General features of the stochastic dynamics of classical systems approaching a thermodynamic equilibrium Gibbs state are studied via the numerical analysis of time-dependent solutions of the Fokker-Planck equation for an overdamped particle in various monostable potentials. A large class of initial states can dynamically bifurcate during its time evolution into bimodal transient states, which i...
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We extract values for the free symmetry energy as a function of the fragment size (the proton number Z) from antisymmetrized molecular dynamics (AMD) calculations of calcium collisions. Simple statistical physics describe well the distribution of hot nuclei at breakup, provided the surface symmetry term in the free energy is much smaller at high excitation than in ground state nuclei. This resu...
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The fluctuations of the largest fragment charge of a partition and of the charge asymmetries of the two or three largest fragments in spectator decays following 197Au + 197Au collisions at 1000 MeV per nucleon are investigated. The observed bimodal distributions at specific values of the sorting variable Zbound exhibit features known from percolation theory where they appear as finite-size effe...
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ژورنال
عنوان ژورنال: Physical Review C
سال: 2018
ISSN: 2469-9985,2469-9993
DOI: 10.1103/physrevc.97.024606