Abstract
Using an apparatus previously described, measurements of the number of gaps\(\bar n\), total length of gaps\(\bar x\), mean gap length\(\bar w = \bar x/\bar n\), and number of « long » gaps\(\bar n_{\varepsilon ^. } \), were made on a large number of tracks. Proton, π-meson and μ-meson tracks coming to rest in the stack of pellicles (the no. 29 stack of Sardinian Expedition 1953) were employed. A rather large velocity interval has been investigated (0 <v/c < 0.80). Our experimental results have been compared with the different theories which have been proposed to describe the formation of tracks of ionizing particles in nuclear emulsions. The problem of choosing the parameter which must be measured in the different velocity intervals in order to obtain the best value of the mass is discussed. It turns out that the best parameters are: in the near minimum region\(\bar w\), and in the « clogged » region\(\bar x\).
Published Version
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