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Berlin 2005 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 34: Theorie

HK 34.8: Talk

Tuesday, March 8, 2005, 18:15–18:30, TU MA042

Low-energy pions in nuclear matter — •Oliver Buss1, Luis Alvarez-Ruso1, Ulrich Mosel1 und Radhey Shyam21Institut für Theoretische Physik, Universität Giessen, Germany — 2Saha Inst. Nuclear Phys., Calcutta, India

werden, We use the the Boltzmann-Uehling-Uhlenbeck (BUU) transport model to describe low energy scattering events of pions and nuclei [1]. Our interest in such low energy events has been triggered by recent photoproduction experiments of the TAPS collaboration [2] and π-induced experiments of the CHAOS collaboration[3]. In these experiments the σ-resonance is excited inside different nuclei and it decays already inside the nuclear medium into a two-pion final-state.
We have shown that also in a regime of large wave length the semi-classical BUU model still gives reasonable results for π-nucleus scattering. Hence it is a suitable tool to describe the final state effects of the latter experiments. In addition we exploited the Δ-hole model to investigate the influence of a mean field potential for the pion on parameters like the mean free path and the velocity of the pion inside the medium and observables like π- and γ-induced [4] scattering events. We also compared our results to fully quantum mechanical calculations.
Work supported by DFG.

[1] Oliver Buss, diploma thesis at JLU Giessen, April 2004.

[2] J. G. Messchendorp et al.,Phys. Rev. Lett. 89, 222302 (2002).

[3] F. Bonutti et al.,Nucl. Phys. A677, 213 (2000).

[4] P. Mühlich,L. Alvarez-Ruso,O. Buss and U. Mosel, Phys.Lett. B595, 216-222 (2004)

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