München 2006 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 23: Elektromagnetische und Hadronische Sonden
HK 23.2: Vortrag
Dienstag, 21. März 2006, 17:15–17:30, G
Search for eta-mesic nuclei at COSY-11 — •Jerzy Smyrski — Jagellonian University, Kraków, Poland
The COSY-11 collaboration performed a measurement of the dp → 3H π+ and dp→ 3He π0 cross sections near the eta production threshold. The experiments were conducted detecting 3He ejectiles and the 3H−π+ pairs during a slow ramping of the COSY deuteron beam. The momentum of the deuteron beam was varied continuously within each cycle from 3.099 GeV/c to 3.179 GeV/c, crossing the threshold for the dp → 3He η reaction at 3.139 GeV/c. Data samples with high statistics were collected on these channels and on other reactions measured in parallel, e.g. dp → 3He η and dp → ppp π−. Very clear signals were observed already online during the experiment. The determined excitation functions for the above mentioned reaction around the eta production threshold will be presented and discussed in context of the search for eta-mesic nuclei and eta-pion mixing effects.
Supported by FZ-Jülich, DAAD, and EU (FP6 HadronPhysics).