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HK: Physik der Hadronen und Kerne

HK 12: Poster Session: Electromagentic and Hadronic Probes

HK 12.17: Poster

Dienstag, 12. März 2002, 10:30–12:45, Foyer Chemie

Search for Eta-nucleus bound state at COSY, Juelich — •B. Roy, B. Roy, H. Machner, and H. Machner — Institut für Kernphysik, Forschungszentrum Jülich, Jülich, Germany

In contrast to the π -nucleon interaction, the η-nucleon interaction is strong and attractive at low energies ( S-wave ). This provides an interesting possibility of the existence of the eta-nucleus bound states, and their production in near threshold η production in proton nucleus collisions. We plan to produce these η -nuclei in p+_Z^AX → ³He+_Z−1^A−2Y_η or p+_Z^AX → d+_Z^A−1X_η reactions by choosing the “magic momentum" of the proton-beam and the detection angle of ³He/d such that the η is produced with very small momentum. In order to detect the η -mesic nucleus events in the presence of large background, it would be necessary to demand a triple coincidence of ³He and the η -mesic nucleus decay particles, namely, protons and pions. In order to tag the η -mesic nucleus through its decay products, a large acceptance plastic scintillator detector “ENSTAR” is being built in Mumbai, India. The detector fabrication is at an advanced stage at BARC, Mumbai and will be shipped to Jülich immediately after the completion of the construction work.