Grain Density in Photographic Tracks of Heavy Particles

Abstract

The relation between grain density in photographic tracks and particle energy has been derived theoretically assuming that the probability that a grain be developed is given by $P=c[1\ensuremath{-}\mathrm{exp}[\ensuremath{-}b{(\frac{\mathrm{dE}}{\mathrm{dR}})}^{\frac{1}{2}}]$. Using a single pair of parameters $b$ and $c$ we can represent with this equation all experimental curves so far published for alpha-particles, tritons, protons, $\ensuremath{\pi}$ and $\ensuremath{\mu}$ mesons (University of Bristol). The agreement between experiments and theory is very satisfactory.