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Quantum molecular dynamics approach to heavy ion collisions : description of the model, comparison with fragmentation data, and the mechanism of fragment formation

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  • Ddc:530
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  • Physics

Abstract

PHYSICAL REVIEW C VOLUME 37, NUMBER 6 JUNE 1988 Quantum molecular dynamics approach to heavy ion collisions: Description of the model, comparison with fragmentation data, and the mechanism of fragment formation J. ~ i c h e l i n , ' ~ ' G. ~ e i l e r t , ' ~ ' A. ~ o h n e t , ' ~ ' A. ~ o s e n h a u e r , ' ~ ' H. ~ t ö c k e r , ' ~ ' and W. reiner'^' '"'Institut für Theoretische Physik der Universität Heidelberg, Heidelberg, Federal Republic of Germany and Max-Planck-Institut für Kernphysik, 0-6900 Heidelberg, Federal Republic of Germany 'b '~ns t i tu t für Theoretische Physik, J . W. Goethe-Universität, 0-6000 Frankfurt u m Main, Federal Republic of Germany "'Gesellschaft für Schwerionenforschung, 0-6100 Darmstadt, Federal Republic of Germany (Received 21 December 1987) We present a detailed microscopic quantum molecular dynamic analysis of fragment formation in the reaction Ne(1.05 GeV/nucleon) + Au. The theoretical predictions of the total mass yield, the multiplicity distribution of clusters, their average momentum, and their angular distribution agree well with the available data. We find a rather localized hot participant Zone, which predominantly emits protons and neutrons. The multiplicity of light clusters depends strongly on the impact pa- rameter whereas the heavier fragments A 240 result from the decay of spectator residues. Their yield can provide a good measure for the impact parameter. The hypothesis of a compound system of Ap and A T nucleons which is globally heated and equilibrated is not supported by our results. Light and massive fragments occupy different regions in phase space. Semiperipheral reactions do not lead to a stopping of the projectile. We observe a power law behavior of the inclusive mass yield distribution. Its form, however, is caused by averaging over different impact Parameters. This rules out inclusive mass yield distributions as candidates for revealing a possible liquid gas phase transi- tion. Light and i

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