Variation of the Rate of Decay of Mesotrons with Momentum

Phys. Rev. 59, 223 – Published 1 February 1941
Bruno Rossi and David B. Hall


In order to determine the dependence of the probability of decay on momentum, mesotrons with range between 196 and 311 g/cm2 of lead and mesotrons with range larger than 311 g/cm2 of lead were investigated separately. The softer group of mesotrons was found to disintegrate at a rate about three times faster than the more penetrating group, in agreement with the theoretical predictions based on the relativity change in rate of a moving clock. A new value of the proper lifetime of mesotrons of (2.4±0.3)×10-6 sec. is determined, based upon measurements with particles with momentum of approximately 5×108 ev/c.


  • Received 13 December 1940
  • Published in the issue dated February 1941

© 1941 The American Physical Society

Authors & Affiliations

Bruno Rossi* and David B. Hall

  • University of Chicago, Chicago, Illinois

  • *Now at Cornell University, Ithaca, New York.

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