A nearly mass-degenerate, long-lived exotic particle produced in rare neutron decays could be observable at the NNBAR free-neutron experiment, with an estimated one to seven decays over three years.
The European Spallation Source Design.Phys
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Searching for Long-Lived Particles in Free Neutron Experiments
A nearly mass-degenerate, long-lived exotic particle produced in rare neutron decays could be observable at the NNBAR free-neutron experiment, with an estimated one to seven decays over three years.