Elliptic flow: Transition from out-of-plane to in-plane emission in Au plus Au collisions

Citation
C. Pinkenburg et al., Elliptic flow: Transition from out-of-plane to in-plane emission in Au plus Au collisions, PHYS REV L, 83(7), 1999, pp. 1295-1298
Citations number
25
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
0031-9007 → ACNP
Volume
83
Issue
7
Year of publication
1999
Pages
1295 - 1298
Database
ISI
SICI code
0031-9007(19990816)83:7<1295:EFTFOT>2.0.ZU;2-9
Abstract
We have measured the proton elliptic flow excitation function for the Au Au system spanning the beam energy range (2-8)A GeV. The excitation functio n shows a transition from negative to positive elliptic flow at a beam ener gy, E-tr similar to 4A GeV. Detailed comparisons with calculations from a r elativistic Boltzmann equation are presented. The comparisons suggest a sof tening of the nuclear equation of state from a stiff form (K similar to 380 MeV) at low beam energies (E-beam less than or equal to 2A GeV) to a softe r form (K similar to 210 MeV) at higher energies (E-beam 4A GeV) where the calculated baryon density rho similar to 4 rho(0).