Neutron Beam Effects on Spin Exchange Polarized He-3

Details Neutron Beam Effects on Spin Exchange Polarized He-3 Neutron Beam Effects on Spin Exchange Polarized He-3

2008-02-21

arxiv.org/abs/0802.3169v1

Phys.Rev.Lett.101:083002,2008

Physics

Nuclear Physics

Nuclear Experiment

submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevLett.101.083002

We have observed depolarization effects when high intensity cold neutron beams are incident on alkali-metal-spin-exchange polarized He-3 cells used as neutron spin filters. This was first observed as a reduction of the maximum attainable He-3 polarization and was attributed to a decrease of alkali-metal polarization, which led us to directly measure alkali-metal polarization and spin relaxation over a range of neutron fluxes at LANSCE and ILL. The data reveal a new alkali-metal spin-relaxation mechanism that approximately scales as the square root of the neutron capture-flux density incident on the cell. This is consistent with an effect proportional to the recombination-limited ion concentration, but is much larger than expected from earlier work.

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