A Compact Apparatus for Muon Lifetime Measurement and Time Dilation   Demonstration in the Undergraduate Laboratory
  We describe a compact apparatus that automatically measures the charge averaged lifetime of atmospheric muons in plastic scintillator using low-cost, low-power electronics and that measures the stopping rate of atmospheric muons as a function of altitude to demonstrate relativistic time dilation. The apparatus is designed for the advanced undergraduate physics laboratory and is suitable for field measurements. 
Thomas Coan, Tiankuan Liu and Jingbo Ye