This title appears in the Scientific Report : 2012 

Search for the 4He-Eta bound states with the WASA-at-COSY facility
Skurzok, M.
Moskal, P. / Krzemien, W.
Experimentelle Hadronstruktur; IKP-1
Progress in particle and nuclear physics, 67 (2012) S. 445 - 448
Oxford [u.a.] Pergamon Press 2012
445 - 448
Journal Article
Study of Strongly Interacting Matter
Physik der Hadronen und Kerne
Progress in Particle and Nuclear Physics 67
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The existence of eta-mesic nuclei in which the eta meson is bound with nucleus by means of the strong interaction was postulated already in 1986, however till now no experiment confirmed it empirically. Discovering of this new kind of an exotic nuclear matter would be very important as it might allow for better understanding of the eta meson structure and its interaction with nucleons. The search for eta-mesic helium (He-4-eta) is carried out with high statistic and high acceptance by means of the WASA detector, installed at the cooler synchrotron COSY in the Research Center inch. The search is conducted via the measurement of the excitation function for the chosen decay channels of the He-4-eta system. In the experiment performed in November 2010 two reactions dd -> (He-4-eta)(bs) -> (3)Hep pi(-) and dd -> (He-4-eta)(bs) -> (3)Hen pi(0) were measured with the beam momentum ramped from 2.127 GeV/c to 2.422 GeV/c. The report includes the description of experimental method and status of the measurement. (C) 2012 Elsevier B.V. All rights reserved.