Lambda collective flow in heavy ion reactions

Details Lambda collective flow in heavy ion reactions Lambda collective flow in heavy ion reactions

1998-11-25

arxiv.org/abs/nucl-th/9811090v1

Nucl.Phys. A645 (1999) 177-188; Erratum-ibid. A648 (1999) 281

Physics

Nuclear Physics

Nuclear Theory

18 pages LeTex, using Elsevier style, 6 PS-figures, accepted for publication in Nuclear Physics A

Scientific paper

10.1016/S0375-9474(98)00605-8

Collective flow of Lambda hyperons in heavy ion reactions at SIS energies is investigated. It is found that a $\Lambda$ mean field constructed on the basis of the quark model leads to a good description of the experimental data of the in-plane transverse flow of $\Lambda$'s. The attractive mean field can also give rise to an additional "virtual" $\Lambda$ radial flow directed inwards, which is reflected by a "concave" structure of the transverse mass spectrum of the $\Lambda$ hyperons emitted at midrapidity. The $\Lambda$ radial flow is found to exhibit a strong mass dependence: The flow is visible in the Ni+Ni system, but is strongly reduced in the system of Au on Au.

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