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Conference: Bucharest University Faculty of Physics 2002 Meeting

Section: Nuclear and Elementary Particles Physics

Title:

Temperatures and densities in nuclear matter obtained in Au - Au collisions at RHIC-BNL energies

Authors:

D. Argintaru[2],I.G. Bearden[6],D.Beavis[1],C.Besliu[2], Y. Blyakhman[5], H.Boggild[6],J.Brzychczyk[3],B.Budick[5], C.Chasman[1], C.H.Christensen[6], P. Christiansen[6], J.Cibor[7],F.Constantin[2],R.Debbe[1],D.Felea[2], J.J.Gaardhoje[6], K.Grotowski[3], K.Hagel[7], O.Hansen[6], A.Holm[6], H.Ito[9], E.Jacobsen[6], Al.Jipa[2],J.I.Jorde[8],F.Jundt[12],C.E.Jorgensen[6], E.J.Kim[4], T.Kozik[3], T.Keutgen[3], T.M.Larsen[11], J.H.Lee[4], Y.K.Lee[4], G.Lovhoiden[11], Z.Majka[3], A.Makeev[7], E.McBreen[1], M.Murray[7], J.Natowitz[7], B.S.Nielsen[6],K.Olchanski[1],J.W.Olness[1],D.Ouerdane[6], R.Planeta[3],F.Rami[12],C.Ristea[2],O.Ristea[2], D.Roehrich[8], B.Samset[11], S.J.Sanders[9], R.Scheetz[1], Z.Sosin[3], P.Staszel[3], T.F.Thorstein[8],T.S.Tveter[11], F.Videbaek[1], R.Wada[7], A.Wieloch[3], R.Zaharia[2], I. S. Zgura[2], E.Stan[2], I.Arsene[2], M.Potlog[2], C.Mitu[2].

Affiliation:

[1] Brookhaven National Laboratory, Upton, NY 11973, USA

[2]Atomic and Nuclear Physics Department, Faculty of Physics, University of Bucharest, Romania

[3]Jagellonian University, Krakow, Poland

[4]Johns Hopkins University, Baltimore, MD 21218, U.S.A

[5]New York University, New York, NY 10003, U.S.A

[6]Niels Bohr Institute, University of Copenhagen, Denmark

[7]Texas A&M University, College Station, TX 77843-3366, U.S.A

[8]Fysisk Institutt, Universitet i Bergen, Bergen, Norway

[9]University of Kansas, Lawrence, KS 66045, U.S.A.

[10]University of Lund, 22100 Lund, Sweden

[11]University of Oslo, Oslo, Norway

[12]University Louis Pasteur, Strasbourg, France

E-mail

Keywords:

Abstract:

Ultrarelativistic heavy ion collisions are useful "tools" to investigate highly excited dense nuclear matter. At sufficiently high temperature, nuclear matter is expected to undergo a phase transition to quark-gluon plasma. Some predictions and experimental results on the particle production yields, rapidity and pseudorapidity distributions, as well as on hadron spectra are included in this paper. For predictions, UrQMD and HIJING codes have been used. The rapidity density, respectively, pseudorapidity density could be used to estimate energy density in Au-Au collisions at sqrt(s)=130AGeV and sqrt(s)=200 AGeV. From transverse mass spectra and transverse momentum spectra - obtained in the same collisions - are extracted pions, kaons, protons and antiprotons temperatures. The mass dependence of the slope parameters provides evidence of the collective transverse flow. Comparisons with the two code predictions are included. Taking into account the fact that some information on the collision dynamics and the thermalisation degree is obtained from the spectral shapes of the interesting physical quantities and their dependencies on rapidity in this paper the dependencies of the average transverse momentum on the rapidity densities and on the pseudorapidity densities are studied. The values of the energy and baryonic densities-over 10 normal values-as well as the agreement between the experimental values on participants and phenomenological model estimations,represent a support for the estimated parameters of the nuclear matter in Au-Au collisions at RHIC-BNL energies as well as for the possibility to evidence phase transitions to the quark-gluon plasma and quark-gluon plasma in these collisions.