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We search for an evidence of eta-mesic 4He with the WASA-at-COSY detector.Two dedicated experiments were performed at the Cooler SynchrotronCOSY-Juelich. The experimental method is based on the measurement of theexcitation functions for the two reaction channels: dd-->3Heppi- anddd-->3Henpi0, where the outgoing N-pi pairs originate from the conversion ofthe eta meson on a nucleon inside the He nucleus. In this contribution, theexperimental method is shortly described and preliminary excitation functionsfrom the 2010 data are presented.

Search for the manifestation of the mesic-nuclei on the dd-->3HeNpi excitation function measured with WASA-at-COSY