Muonium and muonium-like systems formation in spur model

Track electron kinetics is shown to be important for the correct understand ing of mu SR experiments. The quasineutrality restoring time for the region of muon or meso-ion location is investigated theoretically and numerically in different models relating to positive and negative muons. Simple approx imate formulae for numerical results are presented. This time is found to b e much less than the muon's lifetime for light gases and Ne at a liquid pha se pressure. The foregoing makes it possible that meso-ion and electron int eraction leads to the formation of Mu or muonium-like systems. (C) 2000 Pub lished by Elsevier Science B.V. All rights reserved.