UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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Conference: Bucharest University Faculty of Physics 2003 Meeting


Section: Nuclear and Elementary Particles Physics


Title:
On a Possible Fragmentation Mechanisms in Nucleon-Nucleus and Nucleus-Nucleus Collisions at High Energies


Authors:
Alexandru Jipa*, Călin Besliu*, Daniel Felea, Florin Constantin, Bogdan Iliescu*, Emil Stan*, Ion Rosu**, Amelia Horbuniev***, Silvia OCHEŞANU, Costin CARAMARCU, Mădălin CHERCIU


Affiliation:
* Atomic and Nuclear Physics Department, Faculty of Physics, University of Bucharest, ROMANIA

E-mail: jipa@brahms.fizica.unibuc.ro

** “Tudor Arghezi” High School Craiova

*** “I.L.Caragiale” High School Bucharest


E-mail


Keywords:


Abstract:
An interesting aspects in the study of the nucleon-nucleus and nucleus-nucleus collisions at high energies is that of the nuclear multifragmentation mechanisms. Depending of the monomer size different aspects of the nuclear fragmentations can be considered. Many of them could be related to different phase transitions in exicited nuclear matter created in these collisions. In this work the problem of the nuclear fragmentation taking as the minimum size of the monomer the nucleon size is discussed. Using the collison geometry and classical considerations on binding energies, separation energies and available volumes for spectators and participants two possibile fragmentation mechanisms for intermediate mass fragments are mainly proposed. One of them takes into account the high energy accumulated in the overlapping region of the two colliding nuclei and the complete stopping of the projectile nucleus in the target nucleus as possible causes of a explozive nuclear fragmentation process. The second suggests the possibility that the nuclear fragmentation to be a slowly and countinously process in the spectator regions from the first moment of the collision up to the fragmentation moment, being, mainly, the results of the interactions of the particle produced in the participant region with the spectators. Experimental results obtained in proton-nucleus collisions at 8 GeV and 12 GeV, as well as, in nucleus-nucleus collisions at 4.5 A GeV/c are used to sustain the two possible nuclear fragmentation mechanisms.