Intranuclear cascade models lack dynamic flow

We study the recent claim that the intranuclear cascade model exhibits collective sidewards flow. 4000 intranuclear cascade simulations of the reaction Nb(400 MeV/nucleon)+Nb are performed employing bound and unbound ver
We study the recent claim that the intranuclear cascade model exhibits collective sidewards flow. 4000 intranuclear cascade simulations of the reaction Nb(400 MeV/nucleon)+Nb are performed employing bound and unbound versions of the Cugnon cascade. We show that instability of the target and projectile nuclei in the unbound cascade produces substantial spurious sidewards flow angles, for spectators as well as for participants. Once the nuclear binding is included, the peak of the flow angle distributions for the participants alone is reduced from 35° to 17°. The theoretical ‘‘data’’ are subjected to the experimental multiplicity and efficiency cuts of the plastic ball 4π electronic spectrometer system. The flow angular distributions obtained from the bound cascade—with spectators and participants subjected to the plastic ball filter—are forward peaked, in contrast to the plastic ball data. We discuss the uncertainties encountered with the application of the experimental efficiency and multiplicity filter. The influence of the Pauli principle on the flow is also discussed. The lack of flow effects in the cascade model clearly reflects the absence of the nuclear compression energy that can cause substantially larger collective sidewards motion—there is too little intrinsic pressure built up in the cascade model.
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Metadaten
Author:Joseph J. Molitoris, Horst Stöcker, Hans-Ake Gustafsson, Joseph Cugnon, Denis L'Hote
URN:urn:nbn:de:hebis:30-27563
Document Type:Article
Language:English
Date of Publication (online):2006/06/12
Year of first Publication:1986
Publishing Institution:Univ.-Bibliothek Frankfurt am Main
Release Date:2006/06/12
Note:
PACS: 25.70.-z, 25.70.Np
Source:Phys. Rev. C 33, 867-875 (1986), ©1986 The American Physical Society, http://link.aps.org/abstract/PRC/v33/p867
HeBIS PPN:187373795
Institutes:Physik
Dewey Decimal Classification:530 Physik
Sammlungen:Universitätspublikationen
Licence (German):License Logo Veröffentlichungsvertrag für Publikationen

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