  Since long neutron lifetimes measured with a beam of cold neutrons are
significantly different from lifetimes measured with ultracold neutrons bottled
in a trap. It is often speculated that this "neutron anomaly" is due to an
exotic dark neutron decay channel of unknown origin. We show that this
explanation of the neutron anomaly can be excluded with a high level of
confidence when use is made of new data on neutron decay parameters.
Furthermore, data from neutron decay now compare well with Ft data derived from
nuclear \b{eta} decays.
