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Motional spin relaxation in large electric fields

Schmid, Riccardo and Plaster, B. and Filippone, B. W. (2008) Motional spin relaxation in large electric fields. Physical Review A, 78 (2). Art. No. 023401. ISSN 1050-2947. doi:10.1103/PhysRevA.78.023401.

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We discuss the precession of spin-polarized ultracold neutrons (UCNs) 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 UCNs and 3He atoms are important considerations in a new search for the neutron electric dipole moment at the Spallation Neutron Source nEDM experiment. We use a Monte Carlo approach to simulate the relaxation of spins due to the motional v×E field for UCNs 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.

Item Type:Article
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Filippone, B. W.0000-0002-2618-2688
Additional Information:©2008 The American Physical Society. (Received 16 May 2008; published 1 August 2008) We would like to thank M. Hayden for helpful discussions. The work in this paper was supported in part by the U.S. National Science Foundation, Grant No. PHY-0555674.
Funding AgencyGrant Number
National Science FoundationPHY-0555674
Subject Keywords:electric moments; helium; magnetic relaxation; Monte Carlo methods; spin polarized transport; ultracold neutrons
Issue or Number:2
Record Number:CaltechAUTHORS:SCHMpra08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11520
Deposited By: Riccardo Schmid
Deposited On:27 Aug 2008 23:25
Last Modified:08 Nov 2021 22:00

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