Influence of ion-molecular reactions on mu-capture in hydrogen and on fusion in (3)Hed mu muonic molecule

The de-excitation processes (J = 1) --> (J = 0) in muonic molecular ions (p p mu)(+) and ((3)Hed mu)(+) are studied. It is shown that the rate of such transitions substantially depends on the chain of ion-molecular reactions i nitiated by positively charged muonic ions. The probabilities of ortho-para transition in the [(pp mu)H-+(2)] and [(pp mu)(+)e] complexes formed as a result of chemical reactions in the pure hyd rogen were estimated. Taking into account the ion-molecular processes in D-2 +He mixtures, the ev aluation of the observed rate lambda(f) of nuclear fusion in the (3)Hed mu muonic molecules was performed. The expected yield of fusion reactions per muon at the mixture density phi = 0.1 and concentration C-He = 0.05 was obt ained to be equal to N-f approximate to 3 . 10(-8).