Elastic positron-cadmium scattering at low energies

Michael Bromley, James Mitroy

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    The elastic and annihilation cross sections for positron-cadmium scattering are reported up to the positronium-formation threshold (at 2.2 eV). The low-energy phase shifts for the elastic scattering of positrons from cadmium were derived from the bound and pseudostate energies of a very large basis configuration-interaction calculation of the e+-Cd system. The s-wave binding energy is estimated to be 126±42 meV, with a scattering length of Ascat=(14.2±2.1)a0, while the threshold annihilation parameter, Zeff, was 93.9±26.5. The p-wave phase shift exhibits a weak shape resonance that results in a peak Zeff of 91±17 at a collision energy of about 490±50 meV.
    Original languageEnglish
    Pages (from-to)052708-052708
    Number of pages1
    JournalPhysical Review A - Atomic, Molecular, and Optical Physics
    Volume81
    Issue number5
    DOIs
    Publication statusPublished - 25 May 2010

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    cadmium
    positrons
    phase shift
    scattering
    thresholds
    positronium
    configuration interaction
    energy
    elastic scattering
    binding energy
    collisions
    cross sections

    Cite this

    Bromley, Michael ; Mitroy, James. / Elastic positron-cadmium scattering at low energies. In: Physical Review A - Atomic, Molecular, and Optical Physics. 2010 ; Vol. 81, No. 5. pp. 052708-052708.
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    title = "Elastic positron-cadmium scattering at low energies",
    abstract = "The elastic and annihilation cross sections for positron-cadmium scattering are reported up to the positronium-formation threshold (at 2.2 eV). The low-energy phase shifts for the elastic scattering of positrons from cadmium were derived from the bound and pseudostate energies of a very large basis configuration-interaction calculation of the e+-Cd system. The s-wave binding energy is estimated to be 126±42 meV, with a scattering length of Ascat=(14.2±2.1)a0, while the threshold annihilation parameter, Zeff, was 93.9±26.5. The p-wave phase shift exhibits a weak shape resonance that results in a peak Zeff of 91±17 at a collision energy of about 490±50 meV.",
    keywords = "Annihilation cross sections, Collision energies, Configuration-interaction calculations, Low energies, Pseudo state, Scattering length, Shape resonance, Wave phase, Binding energy, Cadmium, Electrons, Phase shift, Scattering, Positrons",
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    Elastic positron-cadmium scattering at low energies. / Bromley, Michael; Mitroy, James.

    In: Physical Review A - Atomic, Molecular, and Optical Physics, Vol. 81, No. 5, 25.05.2010, p. 052708-052708.

    Research output: Contribution to journalArticleResearchpeer-review

    TY - JOUR

    T1 - Elastic positron-cadmium scattering at low energies

    AU - Bromley, Michael

    AU - Mitroy, James

    PY - 2010/5/25

    Y1 - 2010/5/25

    N2 - The elastic and annihilation cross sections for positron-cadmium scattering are reported up to the positronium-formation threshold (at 2.2 eV). The low-energy phase shifts for the elastic scattering of positrons from cadmium were derived from the bound and pseudostate energies of a very large basis configuration-interaction calculation of the e+-Cd system. The s-wave binding energy is estimated to be 126±42 meV, with a scattering length of Ascat=(14.2±2.1)a0, while the threshold annihilation parameter, Zeff, was 93.9±26.5. The p-wave phase shift exhibits a weak shape resonance that results in a peak Zeff of 91±17 at a collision energy of about 490±50 meV.

    AB - The elastic and annihilation cross sections for positron-cadmium scattering are reported up to the positronium-formation threshold (at 2.2 eV). The low-energy phase shifts for the elastic scattering of positrons from cadmium were derived from the bound and pseudostate energies of a very large basis configuration-interaction calculation of the e+-Cd system. The s-wave binding energy is estimated to be 126±42 meV, with a scattering length of Ascat=(14.2±2.1)a0, while the threshold annihilation parameter, Zeff, was 93.9±26.5. The p-wave phase shift exhibits a weak shape resonance that results in a peak Zeff of 91±17 at a collision energy of about 490±50 meV.

    KW - Annihilation cross sections

    KW - Collision energies

    KW - Configuration-interaction calculations

    KW - Low energies

    KW - Pseudo state

    KW - Scattering length

    KW - Shape resonance

    KW - Wave phase

    KW - Binding energy

    KW - Cadmium

    KW - Electrons

    KW - Phase shift

    KW - Scattering

    KW - Positrons

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    U2 - 10.1103/PhysRevA.81.052708

    DO - 10.1103/PhysRevA.81.052708

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