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Positron elastic scattering by semifilled-shell atoms: the $e^{+}+ \rm{Mn}$ case

ORAL

Abstract

Atoms with semifilled shells are special atoms because they possess the highest spin multiplicity among other atoms from the same raw of the periodic table. The current knowledge of positron elastic scattering by atoms with multielectron semifilled shells is lacking. We provide the first initial knowledge on this process. As a case study, we focus on positron elastic scattering of a semifilled-shell Mn($...3d^{5}$$4s^{2}$, $^{6}S$) atom. Scattering phases and total cross sections are calculated and scrutinized. Electron correlation is accounted for in the frameworks of the self-energy part of the positron's Green function and the RPAE theory. The ``spin-polarized'' Hartree-Fock approximation is chosen as the zeroth-order approximation. We also account for the formation of virtual Ps and its impact on the scattering process in a simplified but fairly good approximation, as in Amusia \textit{et al.}, Elastic scattering of slow positrons on atoms, \textit{JETP} \textbf{97} $34$ ($2003$). We unravel the specificity of the impacts of both the virtually formed Ps and electron correlation on $e^{+}+ \rm{Mn}$ elastic scattering. The spectacular differences between the electron and positron scattering by Mn are revealed and interpreted as well.

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Authors

  • Valeriy Dolmatov

    University of North Alabama

  • Robert Grzywacz

    Moscow Institute of Physics and Technology, University of Virginia, California Institute of Technology, National High Magnetic Field Laboratory, University and Student Affairs; Oak Ridge Laboratory, Brookhaven National Laboratory, Physicist, Brookhaven National Laboratory, Oak Ridge National Laboratory, USA, Center for Nuclear Study, University of Tokyo, Advanced Science Research Center, Japan Atomic Energy Agency, Florida State University, Presidency University, Kolkata, INDIA, VECC,Kolkata, INDIA, SINP,Kolkata, INDIA, UGC-DAE CSR (Kolkata), INDIA, IFIN-HH, ELI-NP, Romania, Variable Energy Cyclotron Centre,Kolkata, INDIA, IEM, Kolkata, India, Victoria Institution (College), Kolkata, INDIA, Variable Energy Cyclotron Centre, Kolkata, INDIA, NHMFL; Florida State University, FAMU-FSU College of Engineering, Florida State University, Physics Department, Florida State University, Mississippi State University, NHMFL-FSU, U. Colorado at Boulder, NHMFL, University of Alabama at Birmingham, Oak Ridge National Laboratory, Argonne National Laboratory, Alabama School of Math and Science, University of South Alabama, University of Florida, University of Notre Dame, University of Texas at Dallas, Bob Jones University, University of Tennessee at Chattanooga, The Autonomous University of San Luis Potosí, Northern Arizona University, Flagstaff, AZ, Harvard-Smithsonian Center for Astrophysics, Cambridge, National Institute of Standards and Technology, Clemson University, University of South Florida, Phenikaa University, University of Ulsan, Ohio University, University of Hawaii, University of California, Davis, University of California, Davis., Saleh Research Centre, Department of Physics, Florida State university, Tallahassee, FL32306, USA, WestCHEM, School of Chemistry, University of Glasgow, Glasgow, G12 8QQ, UK, Professor, facility manager, Student, Florida State University(Former), Hebrew University, Israel \& Ioffe Institute, St.\ Petersburg, Russia, University of Tennessee, Knoxville

  • Larissa Chernysheva

    Ioffe Institute, St.\ Petersburg, Russia