TY  - JOUR
AU  - Skurzok, M.
AU  - Moskal, P.
AU  - Krzemien, W.
TI  - Search for the 4He-Eta bound states with the WASA-at-COSY facility
JO  - Progress in particle and nuclear physics
VL  - 67
SN  - 0146-6410
CY  - Oxford [u.a.]
PB  - Pergamon Press
M1  - PreJuSER-19489
SP  - 445 - 448
PY  - 2012
N1  - The work is supported by the Foundation for Polish Science-MPD program, co-financed by the European Union within the European Regional Development Fund, by the Polish National Science Center through grants No. 0320/B/H03/2011/40 and 2011/01/B/ST2/00431, by the European Commission under the 7th Framework Programme through the 'Research Infrastructures' action of the 'Capacities' Programme (FP7-INFRASTRUCTURES-2008-1, Grant Agreement No. 227431) and by the FFE grants of the Research Center Julich.
AB  - 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.
KW  - mesic atom (INSPIRE)
KW  - bound state: (helium eta) (INSPIRE)
KW  - experimental methods (INSPIRE)
KW  - strong interaction (INSPIRE)
KW  - Juelich COSY PS (INSPIRE)
KW  - WASA (INSPIRE)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000303282200058
DO  - DOI:10.1016/j.ppnp.2012.01.008
UR  - https://juser.fz-juelich.de/record/19489
ER  -