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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-21 19:18 |
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Conference: Bucharest University Faculty of Physics 2008 Meeting
Section: Nuclear and Elementary Particles Physics
Title:
Old and new in nuclear fragmentation mechanisms in nuclear collisions at high energies
Authors:
Calin BESLIU*, Emil STAN**, Alexandru JIPA*, Bogdan ILIESCU*, Daniel FELEA**, Madalin CHERCIU**, Andrea DANU**,Valentin GROSSU*
Affiliation:
* Atomic and Nuclear Physics Chair, Faculty of Physics, University of Bucharest, ROMANIA
** Institute of Space Sciences Bucharest-Măgurele, ROMANIA
E-mail
emil@venus.nipne.ro
Keywords:
nuclear multifragmentation, high energies hadron-nucleus reactions, Hubble cosmology
Abstract:
Multiple nuclear fragmentation processes acquire new approaches in the context of the existing experimental results obtained in different experiments. These processes can be associated with different phase transitions in the formed nuclear matter at different temperatures and energies. These transitions can be associated with different cosmological process, too. The nowadays picture asks the introduction a time scale in the range of very short initial processes (5-200 Fm/c) enlarging our limits of understanding. Our presentation is focused on the possibility to define such a time scale inspired by the Einstein`s, de Sitter`s and Hubble`s pictures of the evolution of the Universe. Previously, this scale has been checked for Au+Au collisions at 200 A GeV, in Center of Mass System (CMS). In this work the same type of analysis is applied for fragmentation production in p-nucleus collisions at 8 and 12 GeV, in a analysis collaboration between the Faculty of Physics, University of Bucharest and KEK Tsukuba (Japan). Temporal behaviour of different signals are discussed in the transcriptions of a number of models for fragmentation mechanisms (break-up, evaporation, Fisher-Moretti models). A comparison with FLUKA code predictions is included, also.
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