Muonium spin-exchange in low pressure gases: Mu+O2 and Mu+NO

Publisher Website
Google Scholar
Abstract
The spin‐exchange cross sections σSE for muonium collisions with O2 and NO have been measured in weak transverse magnetic fields in low pressure moderator at 300 K. Average values from runs at 1 and 2.5 atm are σSE(Mu+O2)?1.2)×10−16 cm2 and σSE(Mu+NO) ?1.2)×10−16 cm2. These numbers are in qualitative agreement with those determined earlier by Mobley et al. in ∼40 atm. moderator pressure using a longitudinal field technique. Comparison with recent measurements of the corresponding cross sections for H atom spin exchange at 300 K reveals no isotope effect, consistent with expectations based on a random‐phase approximation.