TITLE

Spin exchange optical pumping at pressures near 1 bar for neutron spin filters

AUTHOR(S)
Rich, D. R.; Gentile, T. R.; Smith, T. B.; Thompson, A. K.; Jones, G. L.
PUB. DATE
March 2002
SOURCE
Applied Physics Letters;3/25/2002, Vol. 80 Issue 12, p2210
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Motivated by applications to neutron spin filters and recent advances in spectrally narrowed laser diode arrays (LDAs), we are exploring spin exchange optical pumping of [sup 3]He at pressures near 1 bar. Among our more interesting results has been the production of glass cells with extremely long relaxation times. The best of these has a lifetime of T[sub 1] = 840 h [where the polarization decays versus time, t, as exp(-t/T[sub 1])], dominated by the dipole-dipole contribution of 950 h at a [sup 3]He partial pressure of 0.85 bar. Using a broadband LDA, we have obtained 55% [sup 3]He nuclear polarization in this cell. These results are particularly relevant to the application of [sup 3]He-based neutron spin filters to neutron scattering and weak interaction experiments. Applications to magnetometry and polarized gas magnetic resonance imaging are also possible.
ACCESSION #
6358298

 

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