In order to determine the dependence of the probability of decay on momentum, mesotrons with range between 196 and 311 g/cm' of lead and mesotrons with range larger than 311 g/cm' 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 ' sec. is determined, based upon measurements with particles with momentum of approximately 5 &&10' ev/c. INTRQDUcTIQN ECENT experiments on the variation of cosmic-ray intensity with altitude have shown that the rate of decrease of the mesotron component with increasing atmospheric depth cannot be accounted for completely by ordinary ionization losses. It has been established, namely,
The temperature dependences of the d.c. magnetic susceptibility and Verdet constant in two zirconium based fluoride glasses have been studied. One sample has as a minor constituent dysprosium which has a large magnetic moment that dominates the material's magnetic character. The second sample, containing a small amount of europium, shows both Van Vleck paramagnetism and a Curie-Weiss behaviour. The Curie-Weiss character is believed to come from small amounts of Zr 3+ and/or Zr 2+ produced during the sample's manufacturing process. An upper limit is placed on the amount of magnetic zirconium in the material.
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