trapping proceeds similarly to the bottle method, except instead of a physical chamber, magnetic traps exploit the magnetic dipole moment of the neutron to confine the ultracold neutrons.

Neutron lifetime puzzle

While the neutron lifetime has been studied for decades, there is currently a lack of agreement on its exact value, due to different results from two experimental methods, "bottle" versus "beam" methods. This has been called variously the neutron lifetime puzzle, neutron lifetime problem, or neutron lifetime anomaly.

The

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