Nuclear Instruments and Methods in Physics Research A 440 (2000) 483}488

Feasibility study of a 3He-magnetometer for neutron electric dipole moment experiments Yu. Borisov!, W. Heil",*, M. Leduc#, V. Lobashev$, E.W. Otten%, Yu. Sobolev! !Petersburg Nuclear Physics Institute, 188350 Gatchina, Russia "Institut Laue-Langevin, 38042 Grenoble, France #Ecole Normale Superieure, 75231 Paris, France $Institute of Nuclear Research, 117312 Moscow, Russia %Institute of Physics, 55099 Mainz, Germany

Abstract We report on a 3He-magnetometer capable of detecting tiny magnetic "eld #uctuations of less than 10~14 T in experiments for measuring the electric dipole moment (EDM) of the neutron. It is based on the Ramsey technique of separated oscillating "elds and uses nuclear spin-polarized 3He gas which is stored in two vessels of