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[en] A detailed study of positron annihilation in helium, argon and helium + argon systems and a systematic investigation of the influence of temperature, electric and magnetic fields, has been carried out. It is found that increasing the temperature or electric field decreases the annihilation decay constant while the magnetic field increases this constant. A model is suggested to estimate the decay constant of mixtures. Comparison with experimental observations is made wherever possible. (author)
Journal
Journal of Physics. B, Atomic and Molecular Physics; ISSN 0022-3700; 
; v. 11(14); p. 2555-2560
; v. 11(14); p. 2555-2560