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HK: Hadronen und Kerne
HK 52: Heavy Ion Reactions VI, Relativistic Energies
HK 52.1: Vortrag
Mittwoch, 18. März 1998, 14:00–14:15, F
Transverse Flow vs. Random Walk: an Interferometric Judgement* — •Boris Tomášik1, Ulrich Heinz1, and Ján Pišút2 — 1Institut f"ur Theoretische Physik, Universit"at Regensburg, D-93040 Regensburg, Germany — 2Faculty of Mathematics and Physics, Comenius University, Mlynská Dolina, SK-84215 Bratislava, Slovakia
Studying the Bose-Einstein correlations resulting from “random walk models” [1,2] we draw the conclusion [3] that they are not able to describe the data from CERN/SPS experiments. These models cannot accomodate the rise of the longitudinal correlation radius with the size of the collision system. They also fail to reproduce the magnitude and M⊥-dependence of the transverse correlation radius Rs. The measured data of Rs in Pb+Pb collisions indicate a source which is in transverse direction approxinately twice as big as the original lead nucleus. This requires transverse collective expansion in those collisions.
[1] A. Leonidov, M. Nardi, H. Satz, Z. Phys. C 74, 535 (1997); Nucl. Phys. A 610 124c, (1996).
[2] S. Jeon, J. Kapusta, Phys. Rev. C 56, 468 (1997).
[3] B. Tomášik, U. Heinz, J. Pišút, submitted to Phys. Lett. B, nucl-th/9711013.
* Supported by DAAD, BMBF, GSI, and DFG.