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HK: Physik der Hadronen und Kerne
HK 22: Postersitzung
HK 22.8: Poster
Monday, March 7, 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 Tp = 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)