Percolation versus microcanonical fragmentation-comparison of fragment size distributions

Where is the liquid-gas transition in nuclei?

H. R. Jaqaman, G. Papp, D. H E Gross

Research output: Contribution to journalArticle

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Abstract

The distributions of fragments produced by microcanonical multifragmentation of hot nuclei are compared with the cluster distributions predicted by a bond percolation model on a finite lattice. The conditional moments of these distributions are used together with the correlations between the largest three fragments in each event. Whereas percolation and statistical nuclear fragmentation agree in many details as in the usual plots of the averaged moments of the fragment distributions which yield the critical exponents, they turn out to be essentially different when less averaged quantities or correlations are considered. The differences between the predictions of the two models are mainly due to the particularities of the nuclear problem, especially the effect of the long-range Coulomb force which favours the break-up of the highly excited nucleus into two large fragments (pseudo-fission) and, to a somewhat lesser extent, enhances the possibility for the cracking of the nucleus into more than two large fragments. The fission events are, however, clearly separated from a second branch of critical correlations which shows up clearly in both nuclear fragmentation and percolation. We think that this critical correlation branch is due to the liquid-gas phase transition in finite nuclei.

Original languageEnglish
Pages (from-to)327-338
Number of pages12
JournalNuclear Physics A
Volume514
Issue number2
DOIs
Publication statusPublished - Jul 30 1990

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fragmentation
fragments
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exponents
vapor phases
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ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Percolation versus microcanonical fragmentation-comparison of fragment size distributions : Where is the liquid-gas transition in nuclei? / Jaqaman, H. R.; Papp, G.; Gross, D. H E.

In: Nuclear Physics A, Vol. 514, No. 2, 30.07.1990, p. 327-338.

Research output: Contribution to journalArticle

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