Motional Spin Relaxation in Large Electric Fields
Schmid, Riccardo · Plaster, B. · Filippone, B. W.
Original · EN
We discuss the precession of spin-polarized Ultra Cold Neutrons (UCN) and ³He atoms in uniform and static magnetic and electric fields and calculate the spin relaxation effects from motional v× E magnetic fields. Particle motion in an electric field creates a motional v× E magnetic field, which when combined with collisions, produces variations of the total magnetic field and results in spin relaxation of neutron and ³He samples. The spin relaxation times T₁ (longitudinal) and T₂ (transverse) of spin-polarized UCN and ³He atoms are important considerations in a new search for the neutron Electric Dipole Moment at the SNS nEDM experiment. We use a Monte Carlo approach to simulate the relaxation of spins due to the motional v× E field for UCN and for ³He atoms at temperatures below 600,mK. We find the relaxation times for the neutron due to the v× E effect to be long compared to the neutron lifetime, while the ³He relaxation times may be important for the nEDM experiment.
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