Article Title

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

Type of Work

Article

Date

3-25-2002

Journal Title

Applied Physics Letters

Journal ISSN

0003-6951

Journal Volume

80

Journal Issue

12

First Page

2210

Last Page

2212

DOI

10.1063/1.1461424

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 He-3 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-1=840 h [where the polarization decays versus time, t, as exp(-t/T-1)], dominated by the dipole-dipole contribution of 950 h at a He-3 partial pressure of 0.85 bar. Using a broadband LDA, we have obtained 55% He-3 nuclear polarization in this cell. These results are particularly relevant to the application of He-3-based neutron spin filters to neutron scattering and weak interaction experiments. Applications to magnetometry and polarized gas magnetic resonance imaging are also possible. (C) 2002 American Institute of Physics.

Hamilton Areas of Study

Physics