Abstract
We search for an evidence of eta-mesic He with the WASA 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 the current status of the analysis is presented.
Highlights
One can define exotic atoms and nuclei, as systems in which one of the standard component particles is replaced by an exotic particle e.g. pionic atoms, where the negatively charged pion replaces an electron
The studies of exotic systems were proved to be very fruitful in the past, e.g. experiments on hypernuclei started a new branch of investigations - the strangess physics
Studies of meson-nucleus interaction have attracted a lot of interest because they serves to better understand the meson - nucleon interaction and provide information about meson properties embedded in nuclear matter, which are directly linked with the postulated partial restoration of the chiral symmetry and the structure of the QCD vacuum [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15]
Summary
One can define exotic atoms and nuclei, as systems in which one of the standard component particles is replaced by an exotic particle e.g. pionic atoms, where the negatively charged pion replaces an electron. The studies of exotic systems were proved to be very fruitful in the past, e.g. experiments on hypernuclei started a new branch of investigations - the strangess physics. In general meson - nucleon binding is the result of an interplay of electromagnetic and strong forces but in the case of neutral mesons. Krzemien printed on June 22, 2021 it is exclusively due to the strong interaction, the mesic nucleus can be considered as a meson captured in the mean field of the nucleons. The η-mesic nucleus is one of the most promising candidates for such a state because of the relatively strong η-nucleon interaction [16,17]. Since many tries have been undertaken to experimentally confirm its existence but without any conclusive result
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