Some Experimental Results Concerning Mesotrons

In the first part of the article cross sections for anomalous, non-Coulombian single scattering of mesotrons are determined by a comparison of the scattering observed in two different lead thicknesses, a method partly described in a previous paper. For mesotrons with energies above ∼5×${10}^8$ ev it is found that the scattering through angles ranging from less than 5° up to 90° is predominantly anomalous. the second section concerns itself with showers of mesotrons. The phenomenon of saturation for the production of mesotron showers in lead as reported by Jánossy and Sinha is not confirmed. Some special photographs of mesotron and electron showers are reproduced and discussed. In the last section an analysis of the number of slow, heavily ionizing mesotrons and protons gives only slight and not conclusive evidence that mesotrons of very low energies (<20 Mev) disappear by a process other than any known so far.