An exclusive measurement of the reaction was carried out at a beam momentum of 1.2 GeV/ using the WASA-at-COSY facility. Information on the total cross section as well as differential distributions was obtained. The data are described by a phenomenological approach based on a combination of a quasifree model and a partial wave expansion for the three-body reaction. The total cross section is found to be . The contribution of the quasifree processes (with the beam or target neutron being a spectator) accounts for 38 of the total cross section and dominates the differential distributions in specific regions of phase space. The remaining part of the cross section can be described by a partial wave decomposition indicating the significance of -wave contributions in the final state.
- Received 12 April 2013
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