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An energy tunable continuous 23S1 positronium beam.

D M Newson1, T J Babij1, D B Cassidy1

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

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Researchers created a positronium (Ps) beam using positron-xenon collisions. They achieved up to 10% of Ps atoms in the 23S1 state, enabling precision spectroscopy feasibility studies.

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Area of Science:

  • Atomic Physics
  • Quantum Mechanics
  • Positronium Spectroscopy

Background:

  • Positronium (Ps) is a fundamental leptonic atom.
  • Precision spectroscopy of Ps provides insights into fundamental physics.
  • Generating Ps beams in specific quantum states is crucial for advanced experiments.

Purpose of the Study:

  • To experimentally produce a beam of 23S1 positronium (Ps) atoms.
  • To characterize the properties of the generated Ps beam, including angular divergence and state population.
  • To assess the feasibility of using this Ps beam for precision spectroscopy of the n=2 fine structure.

Main Methods:

  • Positron beam interacting with Xenon gas in a cell for charge-exchange collisions.
  • Position sensitive detectors used to measure angular divergence.
  • Microwave radiation applied to drive the 23S1 → 23P2 transition to measure the 23S1 state fraction.

Main Results:

  • Successfully produced a beam of positronium atoms.
  • Measured the angular divergence of the Ps beam.
  • Determined that up to 10% of the Ps beam can be formed in the 23S1 state under optimal conditions.

Conclusions:

  • The experimental production of a 23S1 Ps beam is demonstrated.
  • The measured beam properties suggest feasibility for precision spectroscopy.
  • Further research using Ramsey interferometry on the n=2 Ps fine structure is supported by this work.