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Conference: Bucharest University Faculty of Physics 2001 Meeting

Section: Nuclear and Elementary Particles Physics

Title:

Time evolution and thermal balance for the nuclear flow in He + Al, He + Cu and He + Pb reactions at 4.5 A GeV/c Invited lecture

Authors:

C. Besliu*, Al. Jipa*, R. Zaharia*, D. Felea#, I.S. Zgura#, B. Iliescu*, Amelia Horbuniev*

Affiliation:

* Faculty of Physics - University of Bucharest, Magurele, RO-76900, Bucharest, Romania

# Institute of Space Sciences

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Keywords:

Abstract:

Previous papers [1,2,3,4] concerned a number of the nucleus-nucleus reactions at 4.5 A GeV/c, pointed out the existence of the nuclear flow despite the relatively small number of participants and the peripheral collisions [1,5,6,7]. The new analysis on the He+Al, He+Cu, and He+Pb collisions at 4.5 A GeV/c aims the competition between nuclear flow, nuclear jets production and the D(1236) resonance presence in such reactions. A suplimentary test based on the correlation functions was used in order to prove the "short range forces" specific to the flow state. The Ultrarelativistic Quasi Molecular Dynamics model [8] was used in order to predict the evolution in time of the nuclear tensor. The thermal balance is also treated for the different stages of the mentioned reactions. [1]. C. Besliu, Al. Jipa, R. Zaharia, M. Iosif, C. Argintaru, D. Argintaru, D. Felea, Cl. Grigorie, N. Ioneci, Cl. Rusu, I.S. Zgura - Proceedings of the International Symposium "Large Scale Collective Motion of Atomic Nuclei", Messina (Brolo), Sicily, Italy, 15-19 Oct. 1996, Editors (G. Giardina, G. Fazio, M. Lattuada), Ed. World Scientific, Singapore, New Jersey, London, Hong Kong, pg. 307-317, 1997 [2]. C. Besliu, Al. Jipa et al - European Physical Journal A1(1998)65-75 [3]. Al. Jipa, C. Besliu, M. Iosif, R. Zaharia - Il Nuovo Cimento A112(1999)179-203 [4]. C. Besliu, Al. Jipa, R. Zaharia, D. Argintaru, C. Argintaru, D. Felea, N. Ioneci-Sarbu, M. Iosif, Cl. Grigorie, I.S. Zgura - Nuclear Physics A672(2000)446-474 [5]. H. Stöcker, W. Greiner - Phys. Rep.137(1986)277-392 [6]. J.J. Molitoris, D. Hahn, H. Stöcker - Prog. Part. Nucl. Phys. XV(1980)239-326 [7]. S. Soff, A. Bass, C. Hartnack, H. Stöcher, W. Greiner - Phys.Rev.C51(1995)3320 [8]. UrQMD - http://www.th.physik.uni-frankfurt.de/~urqmd/urqmd.html