Investigation of the dd -> 3He n π0 reaction with the FZ Jülich WASA-at-COSY facility

Abstract

An exclusive measurement of the dd -> 3He n π0 reaction was carried at a beam momentum of p = 1.2 GeV/c using the WASA-at-COSY facility. For the first time data on the total cross section as well as differential distributions were obtained. The data are described with a phenomenological approach based on a combination of a quasi-free model and a partial wave expansion for three-body reaction. The total cross section is found to be σ(tot) = (2.89 +- 0.01(stat) +- 0.06(sys) +- 0.29(norm)) μb. The contribution of the quasi-free processes (with the neutron being target or beam spectator) accounts for 38% of the total cross section and dominates the differential distributions in specific regions of the phase space. The remaining part of the cross section can be described within a partial wave decomposition indicating the significance of p-wave contributions in the final state.

arXiv comment9 pages, 7 figures

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• Observation of the Charge Symmetry Breaking d + d -> 4He + pi0 Reaction Near Threshold
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• Nucleon-nucleon charge symmetry breaking and the dd -> alpha pi0 reaction
• Initial-State Coulomb Interaction in the dd -> alpha pi^0 Reaction

Cited by in corpus (3)

• Effective Field Theory calculations of $NN\to NN\pi$
• Charge Symmetry Breaking in dd->4Heπ0 with WASA-at-COSY
• Importance of d-wave contributions in the charge symmetry breaking reaction $dd\to {}^4\text{He}{\pi }^0$