The mu SR spectrometer installed on the surface muon beam of the JINR phaso
tron is described. The possibility of using the surface muon beam with high
contamination of positrons in investigations of a solid state by the mu SR
method is shown. Discrimination of muons From positrons is performed by am
plitude analysis and time-of-flight technique. The investigation has been p
erformed at the Laboratory of Nuclear Problems, JINR (Dubna). (C) 2000 Else
vier Science B.V. All rights reserved.