Darmstadt 2008 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 20: Physik mit schweren Ionen

HK 20.4: Vortrag

Dienstag, 11. März 2008, 09:30–09:45, 2E

Production of fragments with finite strangeness in heavy-ion collisions within a BUU+SMM combined model — •Theodoros Gaitanos, Horst Lenske, and Ulrich Mosel — Institut für Theoretische Physik, Universität Gießen

Hypernucleus production in high energy collisions with rare isotop and antiproton beams will be one of the major projects under investigation in the new experimental facilities at GSI (HypHI and PANDA collaborations, respectively). Such investigations will be important in understanding the interaction between hyperons and nucleons, which can be accessed so far mainly from studies on hypernuclei. We have developed a hybrid model, consisting of a dynamical part (modelled by a covariant transport equation of a Boltzmann-type (GiBUU)) and a statistical part (modelled by a statistical multifragmentation model (SMM)). The GiBUU+SMM model has been applied to heavy-ion collisions at SIS/GSI energies by analyzing the results in terms of fragment formation with and without strangess degrees of freedom. It turns out that the hybrid approach reproduces well experimental data on spectator fragmentation at low beam energies, which motivates its application to nuclear collisions at higher beam energies in studying hypernucleus formation. In particular, we present results for the production probabilities of Λ-hypernuclei for different H- and He-isotops near and beyond the stability region. We thus make predictions for the future HypHI experiment.
Work supported by BMBF.