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Setting Limits on Supersymmetry Using Simplified Models
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Positronium Production and Scattering below Its Breakup Threshold.

S J Brawley1, S E Fayer1, M Shipman1

  • 1UCL Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom.

Physical Review Letters
|December 10, 2015
PubMed
Summary

Positronium atoms were studied at lower energies than before. Their scattering cross sections in Ar and Xe showed minima similar to electron scattering, with new structure observed near 5 eV.

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Area of Science:

  • Atomic and molecular physics
  • Quantum mechanics
  • Antimatter physics

Background:

  • Recent studies highlight similarities between electron and positronium scattering.
  • Previous experiments limited positronium flux and energy ranges.
  • Understanding positronium interactions is key for fundamental physics.

Purpose of the Study:

  • To measure total cross sections for positronium scattering at lower energies (1-7 eV) for the first time.
  • To investigate positronium-Ar and positronium-Xe collisions.
  • To explore the energy dependence of scattering cross sections and identify new structures.

Main Methods:

  • Generated a detectable flux of positronium atoms at significantly lower beam energies.
  • Utilized a novel experimental setup to achieve energies five times lower than previously possible.
  • Measured total cross sections for positronium scattering in Argon (Ar) and Xenon (Xe) targets.

Main Results:

  • Total cross sections for positronium scattering were measured in the energy range of approximately 1-7 eV.
  • Observed the smallest cross sections at the lowest energies, analogous to Ramsauer-Townsend minima in electron scattering.
  • Detected additional structure in positronium scattering cross sections around 5 eV incident energy.

Conclusions:

  • The study successfully extended positronium scattering measurements to lower energies, revealing new insights.
  • The observed Ramsauer-Townsend-like minima suggest fundamental similarities between matter and antimatter scattering.
  • The newly observed structure indicates complex scattering dynamics that warrant further investigation.