Berlin 2005 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 34: Theorie
HK 34.8: Vortrag
Dienstag, 8. März 2005, 18:15–18:30, TU MA042
Low-energy pions in nuclear matter — •Oliver Buss1, Luis Alvarez-Ruso1, Ulrich Mosel1 und Radhey Shyam2 — 1Institut 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)