By means of proportional counters the ionization energy losses in gases of fx mesons of several high-energy groups have been compared with the loss for mesons at minimum ionization. It is shown that in a normal proportional counter and Geiger counter telescope arrangement as was used in this work, the effects of locally generated showers and counter-wall-generated secondary electrons tend to mask the increase in ionization loss accompanying increasing ju-meson energy. When such effects are considered, the theoretical rise as predicted by the Bethe-Bloch-Williams theory is confirmed. * Based, in part, on a dissertation submitted by one of the authors (J. E. K.) to the Graduate School of the University of North Carolina in partial fulfillment of the requirements for the degree of Doctor of Philosophy.t Supported by the U. S. Atomic Energy Commission. I Now on active duty with the U. S. Navy.
A large-volume high-pressure proportional counter used in a study of the ionization energy losses of mu mesons is described. The details of construction for operation at approximately one hundred atmospheres pressure are given.
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