Köln 2004 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 30: Electromagnetic and Hadronic Probes V
HK 30.8: Talk
Wednesday, March 10, 2004, 16:00–16:15, B
Measurements on the Reaction pn → d η near threshold — •Norbert Lang, Alfons Khoukaz, Timo Mersmann, and Ricarda Menke — Westfälische Wilhelms-Universität, Institut für Kernphysik, Münster, Germany
Measurements on near threshold η-production in pn-collisions are of great interest with respect to the still not well known strong η-N interaction and the possibility for the existence of quasi-bound η-nucleus states.
The topic of this talk is the investigation of the reaction pd → pspectator d η performed at two incident proton beam momenta of p=2.055 GeV/c and 2.095 GeV/c. The data have been obtained using the ANKE spectrometer at COSY-Jülich with a deuterium cluster target. A position sensitive silicon telescope, allowed for the identification of slow spectator protons.
Using spectator kinematics it is possible to measure the reaction pd → pspectator d η as a substitute for the η-production on a free neutron in the channel pn → d η. The reconstruction of the spectator-proton momentum allows the determination of the Q-value, which is influenced by the Fermi momentum of the nucleons in the deuteron. The event-by-event reconstruction of the excess energy Q allows one to scan the excitation function over a broad interval using only one fixed beam momentum.
The new ANKE data will be discussed and compared with existing data.
This work is supported by the Forschungszentrum Jülich.