Abstract
Tracks of negative pions of momentum 5.7 GeV/c are followed in nuclear emulsion. In 706 m of pion track 1709 absorption stars are found, yielding a mean free path for star production of (41.4±1.6) cm. In 652 m of particle track, 522 scatterings are also observed, with scattering angles between 0.45° and 8.15°. To find and measure these angles a special recorder is attached to a microscope. Corrections for muons, electrons and other contaminations of the beam, inelastic scatterings and geometrical losses are taken into account. The optical model is used to interpret the data. The effects of the Coulomb field due to an extended charge distribution are incorporated in the model. For a square-well potential we used three variable parameters,R0 (R=R0A1/3),W andV0 (V=V0-iW). The best fit for the experiment with an estimated error isR0=(1.20±0.05) fermi,W=(41±7) MeV,V0=(13±10) MeV. A tapered-well potential as found with electron-scattering data was also used in the analysis. The best parameter values are then:W=(44±8) MeV,V0=(30±10) MeV.
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