The Surface Loss Correction for Nuclear Emulsions

Abstract

When nuclear emulsions are used in the investigation of the angular distributions of scattered particles those tracks which pass through the emulsion surface cannot be accepted for measurement and in consequence the observed angular distribution must be corrected to allow for this. In the present paper, formulae are developed for the case of particles recoiling from a mono-energetic beam of particles incident at any angle on the surface. The effect of small-angle scattering is neglected but on the basis of work done by Powell and Occhialini it is believed that the formulae are valid for recoil energies at least as great as 5 MeV. Curves are given from which the factor can be obtained in any given case.