• Elastic-scattering cross-section for electrons and positrons from atomic hydrogen

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      https://www.ias.ac.in/article/fulltext/pram/025/06/0695-0712

    • Keywords

       

      Elastic scattering; cross-section; Glauber approximation; eikonal approximation; exchange effects; polarization effect; unitary operator

    • Abstract

       

      The differential cross-sections of atomic hydrogen for elastic scattering of electrons and positrons have been rederived with the help of a method using a single parameter-dependent unitary shift operator for the calculation of the direct contribution. When the parameter approaches zerc the new method leads to the well-known conventional Glauber results. The numerical calculations include polarization effects and the exchange corrections obtained according to alternative approximation methods. Results calculated with Franco’s exchange show a definite improvement over the earlier results for medium energy electrons at large angles of scattering. Total elastic cross-sections have been calculated for 50 and 100eV electrons and positrons.

    • Author Affiliations

       

      V L Narasimham1 A S Ramachandran1 C S Warke1 2

      1. Department of Physics, Indian Institute of Technology, Bombay - 400 076, India
      2. Tata Institute of Fundamental Research, Homi Bhabha Road, Bombay - 400 005, India
    • Dates

       
  • Pramana – Journal of Physics | News

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