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The eta-mesic nuclei in which the eta meson is bound with nucleus via stronginteraction was postulated about 25 years ago, however till now no experimentconfirmed empirically its existence. The discovery of this new kind of anexotic nuclear matter would be very important for better understanding of theeta meson structure and its interaction with nucleons. The search for eta-mesichelium is carried out with high statistic and high acceptance with theWASA-at-COSY detection setup and the Cooler Synchrotron COSY. The search isconducted via the measurement of the excitation function for the chosen decaychannels of the 4He-eta system. Until now two reactions dd -> (4He-eta)bound->3Heppi- and dd -> (4He-eta)bound ->3Henpi0 have been measured with the beammomentum varied continuously around the eta meson production threshold. Thiscontribution includes description of recently published results of theWASA-at-COSY experiment as well as brief presentation of preliminary resultsfrom the analysis of new data sample with 20 times larger statistics.

Search for the eta-mesic helium by means of WASA detector at COSY