MEASUREMENT OF MOMENTUM AND ANGULAR DISTRIBUTION OF PUNCHTHROUGH MUONS AT THE RD5 EXPERIMENT

Abstract The momentum and angular distributions of punchthrough muons have been measured after a 10 λ calorimeter using an iron toroid magnet with 1.5 T as spectrometer. The calorimeter was inside a variable magnetic field of 0 to 3 T. The incident momentum of the π − beam ranged from 20 to 300 GeV/ c . Measurements were also done at some beam momenta for π + , K + and p. The results are compared with Monte Carlo predictions. A parameterization for the momentum spectrum of punchthrough muons was derived from the data.