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This study measured the positronium 2^{3}S_{1}→2^{3}P_{0} transition frequency. The experimental result of 18501.02±0.61 MHz disagrees with the theoretical prediction.

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Area of Science:

  • Atomic Physics
  • Quantum Electrodynamics

Background:

  • Positronium (Ps) is a simple atomic system composed of an electron and a positron.
  • Precise measurements of Ps transitions test fundamental theories like Quantum Electrodynamics (QED).
  • The 2^{3}S_{1}→2^{3}P_{0} transition is sensitive to relativistic effects and QED corrections.

Purpose of the Study:

  • To perform a new, precise measurement of the positronium 2^{3}S_{1}→2^{3}P_{0} transition frequency.
  • To compare the experimental result with existing theoretical calculations.
  • To identify potential discrepancies in theoretical models or experimental techniques.

Main Methods:

  • Slow positronium atoms were optically excited to the metastable 2^{3}S_{1} state.
  • The excited Ps atoms traversed a microwave radiation field tuned to induce the 2^{3}S_{1}→2^{3}P_{0} transition.
  • The transition was detected by analyzing the time spectrum of subsequent ground state Ps annihilation radiation.
  • Zeeman shifts were carefully accounted for in the analysis.

Main Results:

  • A new experimental value for the transition frequency was obtained: ν_{0}=18501.02±0.61 MHz.
  • This measured frequency is not in agreement with the current theoretical value of ν_{0}=18498.25±0.08 MHz.
  • The discrepancy suggests a need for refinement in theoretical calculations or experimental procedures.

Conclusions:

  • The new measurement provides a precise experimental value for the 2^{3}S_{1}→2^{3}P_{0} transition in positronium.
  • A significant disagreement exists between the experimental result and theoretical predictions.
  • Further theoretical and experimental investigations are warranted to resolve this discrepancy and improve our understanding of positronium physics.