Positronium-positronium scattering using the stochastic variational method

James Mitroy, Igor A. Ivanov, Kalman Varga

    Research output: Contribution to journalComment/debate

    Abstract

    The stochastic variational method is used in conjunction with stabilization ideas to compute the low-energy s-wave phase shifts and scattering lengths for Ps-Ps scattering. The scattering lengths obtained were 8.44a0 for the singlet-singlet and 3.00a0 for the triplet-triplet states (the spin state refers to the coupling of the two electrons and the coupling of the two positrons in the system). The positive scattering length in the triplet-triplet channel means a stable Bose-Einstein condensate of triplet Ps atoms is physically possible. The large value of the 3Ps3Ps→1Ps1Ps cross section, 7.41πa02 suggests the use of spin-polarized positrons as advanced by Platzmann and Mills [Phys. Rev. B 49 454 (1994)].
    Original languageEnglish
    Pages (from-to)022704-1-022704-9
    Number of pages9
    JournalPhysical Review A (Atomic, Molecular and Optical Physics)
    Volume65
    Issue number2
    DOIs
    Publication statusPublished - 2002

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