Abstract
Our group at TRIUMF reported earlier a study of the spin exchange reactions of Mu with O2 and NO in the range 295 K to 478 K. We have extended the measurement with O2 to a low temperature region down to 88 K. From 135 K to 296 K, the spin depolarization rate constantk d(T) was found to vary according to the relative velocity of the colliding species,T 1/2, which indicates that the spin exchange cross section of Mu-O2 is temperature independent in this temperature range. The value ofk d(T) at 296 K is in good agreement with our earlier study. However, it was found that below 105 K and above 400 K,k d(T) tends to have stronger temperature dependences (T n, withn>1/2). This deviation fromT 1/2-behavior can be attributed to the velocity (energy) dependence of the spin exchange cross section.
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Senba, M., Garner, D.M., Arseneau, D.J. et al. Temperature dependence of muonium spin exchange with O2 in the range 88 K to 478 K. Hyperfine Interact 18, 703–708 (1984). https://doi.org/10.1007/BF02064889
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DOI: https://doi.org/10.1007/BF02064889