Search for eta-mesic He-4 in the dd -g (3)Hen pi(0) and dd -g (3)Hep pi(-) reactions with the WASA-at-COSY facility

The search for He-4-eta bound states was performed with the WASA-at-COSY facility via the measurement of the excitation function for the dd -> (3)Hen pi(0) and dd -> (3)Hep pi(-) processes. T ...