Rebunching low energy neutrons by magnetic acceleration and deceleration

Acceleration control for neutrons was demonstrated. Ultra cold neutrons (UCN) -neutrons with energies less than 300 neV - can be accelerated or decelerated by means ofstatic magnetic and RF fields. Neutrons have a magnetic dipole moment, and hence theirkinetic energies vary depending on their spin in magnetic fields. Their kinetic energiesare restored when they leave the magnetic field area if their spin did not flip. A spinflip can be triggered by applying an RF field whose frequency coincides with the spinprecession frequency of a neutron in this magnetic field. This allows to tune the kineticenergy of neutrons. This method can be used to rebunch a pulsed beam of neutrons to astorage bottle that can store UCN. By opening and closing the storage bottle synchronouslywith the rebuncher, high UCN densities can be achieved for precision measurements ofneutron properties such as the Electric Dipole Moment.