Search for He-eta bound states with the WASA-at-COSY facility

Details Search for He-eta bound states with the WASA-at-COSY facility Search for He-eta bound states with the WASA-at-COSY facility

2011-12-12

arxiv.org/abs/1112.2521v1

Physics

Nuclear Physics

Nuclear Experiment

Presented at the Erice School on Nuclear Physics 2011. 5 pages, 3 figures

Scientific paper

The existence of eta-mesic nuclei in which the eta meson is bound in a nucleus by means of the strong interaction was postulated already in 1986, albeit not yet confirmed it by experiment. The discovery of this new kind of an exotic nuclear matter would be very important as it might allow for a better understanding of the eta meson structure and its interaction with nucleons. The search for eta-mesic helium 4He-eta is carried out with high statistics and high acceptance with the WASA detector, installed at the cooler synchrotron COSY of the Research Center Juelich. The search is conducted via the measurement of the excitation function for selected decay channels of the 4He-eta system. In the experiment, performed in November 2010, two reactions dd->(4He-eta)bs ->3He p pi- and dd->(4He-eta)bs ->3He p pi0 were measured with a beam momentum ramped from 2.127GeV/c to 2.422GeV/c. The report includes the description of the experimental method and status of the measurement.

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