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- W2014007057 abstract "Nuclear fragmentation processes in high-energy proton-nucleus reactions are discussed in the framework of an equilibrium statistical model. Every decay channel of the rest-target system at a given temperature and a given volume is assumed to have equal probability. Such a system behaves like an imperfect gas of condensated “drops” (coexistence of nuclear fragments and “free” nucleons). The fact that the nuclear fragments as well as the rest-target have finite mass and finite charge turns out to play a decisive role. In particular, it forbids the application of macro-statistics, as used in Fisher's model. A Monte Carlo simulation is used to calculate the fragment distribution. After nuclear decoupling the fragments separate under their mutual Coulomb repulsion. The Monte Carlo simulation allows one to calculate the energy spectra of the fragments. The spectra agree reasonably with the experimental data for p + U collisions at 4.9/11.5 GeV. It is extremely interesting that the slope parameter of the spectra, the “apparent” temperature, turns out to be considerably larger than the true temperature (T ∼ 4.3 MeV) of the system. This enhancement is due to the fluctuations in the Coulomb potential. It is furthermore found that the system disintegrates close to a phase transition. This phase transition is specific for finite, highly charged systems. As the heat capacity CV(T) shows a maximum, we conclude that the transition corresponds to a first-order one." @default.
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- W2014007057 title "Finite-size effects and statistical approach to nuclear fragmentation processes: Monte Carlo simulation" @default.
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- W2014007057 doi "https://doi.org/10.1016/0375-9474(85)90060-0" @default.
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