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PHYSICAL RESEARCH 33 DISPERSION THEORY APPROACH TO NUCLEON-NUCLEQN SCAT- TERING (1961). 45 minutes, color. Produced by the USAEC's Lawrence Radiation Laboratory at the University of California. For sale by W. A. Palmer Films, at $277.39 per print, including shipping case, F.O.B. San Fran- cisco. Available for loan (free) only from the USAEC film libraries at Washington, D. C., headquarters, and the Chicago and San Francisco operations offices, as well as from the Graphic Arts Department, Lawrence Radiation Laboratory, P. O. Box 808, Livermore, Calif. 94550. Cleared for television. This filmed technical lecture by Dr. H. Pierre Noyes, which outlines some of the main ideas and techniques used in the calculation of the nucleon-nucleon scattering matrix from its analytic properties and unitarity, is suitable for use in a seminar at the graduate student- staff level or as an introductory lecture in a course on dispersion theory. It presupposes some familiarity with scattering solutions of the nonrelativistic Schroedinger equation and Cauchy's theorem and an acquaintance with Feynman diagrams, but it does not assume an inti- mate knowledge of quantum field theory. Topics discussed are as fol- lows: (1) Solution of the S-wave Schroedinger equation for a super- position of exponential or Yukawa potentials by conversion to a Volterra equation, using the method of Andre Martin. (2) Solution of the same equation by partial-wave-dispersion relations using the N/D method; construction of the potential from the discontinuity in the partial-wave amplitude. (3) The Mandelstam representation for potential scattering and construction of the double-spectral function. (4) Relation between the field—theoretic amplitude and the nonrelativistic scattering ampli- tude. (5) Relation of nucleon—nucleon scattering to the nucleon— antinucleon amplitude, pion—nucleon scattering, pion—pion scattering, and nucleon electromagnetic structure. The same material is covered in more detail, with references for further study, in a paper presented by the lecturer at the Midwest Conference on Theoretical Physics, held at Minneapolis, in May 1961 (Report UCRL-6402). (This paper is included in the film case as an instructor's manual.) FABRICATION OF THE ACCELERATOR STRUCTURE (1965). 40 minutes, color. Produced by the USAEC's Stanford Linear Accelerator Center. For sale by Filmservice Laboratories, Inc., at $124.02 per print, including shipping case, F.O.B. Hollywood. Available for loan (free) only from USAEC headquarters, Washington, D. C., Chicago Operations Office, and San Francisco Operations Office. Cleared for television. This film describes the methods used in the fabrication of the accel- erating structure and associated components for the AEC's two-mile linear electron accelerator at Stanford University. The accelerator