Spin dependence of nuclear forces is probably becoming more accessible to experiment as makers of polarized ion beams improve their sources. Two methods appear to be battling for the honor of producing the most intense and best polarized beams. The “conventional” one throws out ground‐state atoms you don't want with inhomogeneous magnetic fields and keeps the ones you do want.
Lamb‐Effect Sources Make Better Polarized Ion Beams
Lamb‐Effect Sources Make Better Polarized Ion Beams. Physics Today 1 January 1969; 22 (1): 67–69. https://doi.org/10.1063/1.3035361
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