Mean Lifetime Measurement of (Atmospheric) Muons
By using Two Scintillator Paddles

In this experiment, mean lifetime of muons reaching on Earth surface are measured by using two scintillators connected to PMTs. An atmosferic muon is stoped (with a certain probability) in the Aluminum block placed between scintilators (see Figure below). Then, muon decays to electron and two neutrinos. The decay time is in the order of a few microseconds. The distribution of these decay times are shown graph given below. On average, we record 36 muon decays per hour. Mean value of the distibution decay time (lifetime) are found to be 2.26 ± 0.09 μs which is consitent with the best value.

Dr. Ahmet Bingul
Department of Engineering Physics
Gaziantep University

World average [PDG] T(muon) = 2.1969811 ± 0.0000022 us
Our measurment result (Run1) T(muon) = 2.26 ± 0.09 us   [Run1.data] [Run1.C]
Our measurment result (Run2) T(muon) = 2.34 ± 0.16 us  [Run2.data] [Run2.C]
Ratio (Run1/PDG) R = 1.03 ± 0.04
Ratio (Run2/PDG) R = 1.07 ± 0.17

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