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Published February 8, 1993 | Published
Journal Article Open

Highly polarized muonic He produced by collisions with laser optically pumped Rb


We have formed highly polarized muonic helium by stopping unpolarized negative muons in a mixture of unpolarized gaseous He and laser polarized Rb vapor. The stopped muons form muonic He ions which are neutralized and polarized by collisions with Rb. Average polarizations for 3He and 4He of (26.8±2.3)% and (44.2±3.5)% were achieved, representing a tenfold increase over previous methods. Relevant cross sections were determined from the time evolution of the polarization. Highly polarized muonic He is valuable for measurements of the induced pseudoscalar coupling gp in nuclear muon capture.

Additional Information

©1993 The American Physical Society. Received 24 September 1992. We gratefully acknowledge many helpful discussions with Will Happer and the assistance of Bastiaan Driehuys. This work is supported by the U.S. Department of Energy under Grants No. DE-FG02-90ER40557 and No. DE-FG02-84ER40146.

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