Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2008-05-16
Phys.Rev.A78:023401,2008
Physics
Nuclear Physics
Nuclear Experiment
5 Pages, 4 Figures, 1 Table. Submitted to Phys. Rev. A
Scientific paper
10.1103/PhysRevA.78.023401
We discuss the precession of spin-polarized Ultra Cold Neutrons (UCN) and $^{3}$He atoms in uniform and static magnetic and electric fields and calculate the spin relaxation effects from motional $v\times E$ magnetic fields. Particle motion in an electric field creates a motional $v\times E$ magnetic field, which when combined with collisions, produces variations of the total magnetic field and results in spin relaxation of neutron and $^{3}$He samples. The spin relaxation times $T_{1}$ (longitudinal) and $T_{2}$ (transverse) of spin-polarized UCN and $^{3}$He atoms are important considerations in a new search for the neutron Electric Dipole Moment at the SNS \emph{nEDM} experiment. We use a Monte Carlo approach to simulate the relaxation of spins due to the motional $v\times E$ field for UCN and for $^{3}$He atoms at temperatures below $600,\mathrm{mK}$. We find the relaxation times for the neutron due to the $v\times E$ effect to be long compared to the neutron lifetime, while the $^{3}$He relaxation times may be important for the \emph{nEDM} experiment.
Filippone B. W.
Plaster Bradley
Schmid Riccardo
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