22 Feb 2011



Experiments to measure the Electric Dipole Moment of the neutron


​​​​​​​​​​Part of the experiment that set the neutron EDM limit at the ILL - Grenoble


Neutron Electric Dipole Moment​

​The electric dipole moment (EDM) of the neutron ​​is a quantity which would violate the fundamental symmetries of space and time.​ As such searches for​ the neutron EDM take a prominent place in experimental particle physics.​​

Experiments to measure the neutron EDM have been carried​ out by the Rutherford Appleton Lab and the University of Sussex at the Institut Laue Langevin (ILL) in Grenoble (France) and set the​ tightest limit ever on the magnitude of the neutron EDM using a room temperature experiment.

The nEDM experiment used at the ILL-Grenoble has been upgraded and moved to the Paul Sherrer Institute (Switzerland) where it is currently operating. At ILL-Grenoble a new neutron EDM experiment, PanEDM,​ is being developed using cryogenic techniques such as a super-thermal ultra-cold neutron source. Operating a neutron EDM experiment under cryogenic conditions will ​allow to improve the parameters that define the experiment's sensitivity​ significantly. The RAL group is involved in this new venture that aims to perform a cryogenic neutron EDM measurement in a staged way.​​


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