Spinodal decomposition, nuclear fog and two characteristic volumes in thermal multifragmentation
V. A. Karnaukhov, H. Oeschler, S. P. Avdeyev, V. K. Rodionov, V. V. Kirakosyan, A. V. Simonenko, P. A. Rukoyatkin, A. Budzanowski, W. Karcz, I. Skwirczynska, E. A. Kuzmin, L. V. Chulkov, E. Norbeck, A. S. Botvina
Abstract
Thermal multifragmentation of hot nuclei is interpreted as the nuclear liquid-fog phase transition inside the spinodal region. The experimental data for p(8.1GeV) + Au collisions are analyzed within the framework of the statistical multifragmentation model (SMM) for the events with emission of at least two IMFs. It is found that the partition of hot nuclei is specified after expansion to a volume equal to Vt = (2.6+-0.3) Vo, with Vo as the volume at normal density. However, the freeze-out volume is found to be twice as large: Vf = (5+-1) Vo.
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