Search for the manifestation of the mesic-nuclei on the dd-->3HeNpi   excitation function measured with WASA-at-COSY
  We search for an evidence of eta-mesic 4He with the WASA-at-COSY detector. Two dedicated experiments were performed at the Cooler Synchrotron COSY-Juelich. The experimental method is based on the measurement of the excitation functions for the two reaction channels: dd-->3Heppi- and dd-->3Henpi0, where the outgoing N-pi pairs originate from the conversion of the eta meson on a nucleon inside the He nucleus. In this contribution, the experimental method is shortly described and preliminary excitation functions from the 2010 data are presented. 
Wojciech Krzemien, Pawel Moskal and Magdalena Skurzok
nucl-ex