Berlin 2005 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 22: Postersitzung

HK 22.8: Poster

Montag, 7. März 2005, 16:30–18:00, TU MA141

Single-Pion Production Measured at COSY-TOF^∗ — •E. Doroshkevich, K. Haug, H. Clement, K. Ehrhardt, A. Erhardt, R. Meier, and G. J. Wagner — Physikalisches Institut, Universität Tübingen

The single-pion production channels pp → dπ⁺, pp → pnπ⁺ and pp → ppπ⁰ have been measured at COSY at incident proton energies of 400 and 800 MeV, the latter with polaried beam. In order to have minimum contributions from pion decay in flight and simultaneously an optimum phase space coverage by the central calorimeter the TOF spectrometer has been used in its short version. Track reconstruction is achieved by pixel informations from start, fiber, quirl and ring hodoscopes. Particle identification and kinetic energies have been obtained for particles detected in the central calorimeter. For particles detected at larger angles in the ring hodoscope the time-of-flight information has been utilized for the determination of their kinetic energy. This way the full event information is obtained with four overconstraints in case of the dπ⁺ channel and one overconstraint in case of ppπ⁰ and pnπ⁺ channels.
For pp → dπ⁺ the resulting angular distributions agree well with SAID. Our data for pp → ppπ⁰ at T_p = 400 MeV agree with a previous experiment [1] in the overall features, however, deviate significantly in the angular distributions.
Graduiertenkolleg)

[1] R. Bilger et al., Nucl. Phys. A693 (2001) 633 ^∗ supported by BMBF (06 TU 201), DFG (Europ. Graduiertenkolleg), FZ Jülich (FFE) and Landesforschungsschwerpunkt (Quasiteilchen)