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HK: Fachverband Hadronen und Kerne

HK 57: Hadron Structure and Spectroscopy II

HK 57.7: Talk

Wednesday, March 18, 2009, 18:00–18:15, H-ZO 30

η photoproduction on ³He : Search for η-mesic nuclei — •Francis Pheron — Department of Physics, University of Basel

Photoprodution of η-mesons off ³He has been studied via the η→ 2γ and η→ 3π⁰ decay modes at the tagged photon beam of the Mainz MAMI accelerator using the combined 4π Crystal Ball/TAPS calorimeter. In a previous experiment, Pfeiffer et al. [1] had reported evidence (although at low statistical significance) for the formation of a quasi-bound η-nucleus state. The present experiment aimed at an improved statistical quality for the structure reported for coherent η -photoproduction as well as for the π⁰-p back-to-back channel. Preliminary results will be presented. Moreover alternative ways for the search of η-mesic nuclei using coherent photoproduction of π⁰η-pairs will be discussed.

[1] M.Pfeiffer et al, Phys. Rev. Lett. 92, 252001 (2004)

Supported by Schweizerischer Nationalfond, DFG, and EU/FP6