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[en] From Monte Carlo analyses of measured time-of-flight spectra for slow positrons traveling down a tube which is first evacuated and then filled with low-density helium gas, it is shown that the positrons leave the MgO-coated source grid at angles close to the normal direction. This result is important for low-energy positron collision studies. An interpretation of the result based on the surface charge held by the oxide is proposed. (orig.)
Journal
Applied Physics; ISSN 0340-3793; 
; v. 25(3); p. 269-271
; v. 25(3); p. 269-271