Investigation of spurious scattering in nuclear emulsion

Properties of spurious scattering in nuclear emulsion have been investigated using protons of momenta 19.8 and 24 GeV/c from the external beam of the CERN Proton Syncrotron. The variation of the spurious scattering signal with cell lengths of from 2 to 12 millimeters and dip angles of from 0 to 3 degrees is investigated and a functional relationship describing the observed variation is presented. A simple method for measuring momenta is presented which takes advantage of the observation that this functional relationship for the spurious scattering fits the results of other investigators working with a similar range of momenta. Evidence is presented which indicates that the spurious scattering is enhanced when using an oil immersion lens, presumably due to the absorption of oil by the emulsion.