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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.
Free neutrons have a measured lifetime of 880 s, but disagreement between existing laboratory measurements of ~10 s have persisted over many years. This uncertainty has implications for multiple physics disciplines, including standard-model particle
The results of measurements performed using UCN storing method are in good agreement. The latest most accurate measurements of the neutron decay asymmetry and neutron lifetime measurements by storage method are in agreement within the Standard Model.
The review of experimental measurements of neutron lifetime is presented. Latest measurements with gravitational trap (PNPI NRC KI) and magnetic trap (LANL, USA) confirmed the result obtained by PNPI group in 2005. The results of measurements perform
We report an improved measurement of the free neutron lifetime $tau_{n}$ using the UCN$tau$ apparatus at the Los Alamos Neutron Science Center. We counted a total of approximately $38times10^{6}$ surviving ultracold neutrons (UCN) after storing in UC
We present the status of current US experimental efforts to measure the lifetime of the free neutron by the beam and bottle methods. BBN nucleosynthesis models require accurate measurements with 1 second uncertainties, which are currently feasible. F