M. Klopf, E. Jericha, B. Märkisch, H. Saul, T. Soldner, H. Abele:
"Constraints on the Dark Matter Interpretation n→χ+e+e of the Neutron Decay Anomaly with the PERKEO II Experiment";
Physical Review Letters, 122 (2019), 222503; S. 1 - 4.

Kurzfassung englisch:
Discrepancies from in-beam- and in-bottle-type experiments measuring the neutron lifetime are on the 4σ standard deviation level. In a recent publication Fornal and Grinstein proposed that the puzzle could be solved if the neutron would decay on the one percent level via a dark decay mode, one possible branch being n→χ+e+e. With data from the Perkeo II experiment we set limits on the branching fraction and exclude a one percent contribution for 95% of the allowed mass range for the dark matter particle.

Dark matter; Electroweak interaction; Neutrons; Nuclear Physics; Particles & Fields; Gravitation, Cosmology & Astrophysics

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