Muonium atom spin exchange with alkali-metal vapors: Mu+Cs.

摘要: The thermally averaged total electron spin-flip cross sections ([sigma][sub SF]) for Mu-Cs have been measured in a 2 atm N[sub 2] moderator at 543, 566, and 643 K using the muon-spin-rotation technique. Within an overall experimental error of [plus minus]15%, can be taken as temperature independent, [sigma][sub SF]=39.7[plus minus]6.0[times]10[sup [minus]16] cm[sup 2], though there may trend to decreased values lower temperatures. This average value is considerably than either early calculated results Dalgarno Rudge [Proc. R. Soc. London Ser. A 286, 519 (1965)] or more recent ones Cole Olson [Phys. Rev. 31, 2137 (1985)] corresponding H-Cs collisions, indicating dramatic isotope effect.