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Updated: Dec 24, 2025

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
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A pulsed positronium beam using a positron buffer gas trap.

J R Machacek1, S J Buckman1, J P Sullivan1

  • 1Plasma Research Laboratory, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia.

The Review of Scientific Instruments
|April 9, 2020
PubMed
Summary
This summary is machine-generated.

We developed a tunable positronium beam using a two-stage buffer gas trap. This method allows tailoring positron beam properties for controlled positronium generation via charge exchange, enhancing experimental applications.

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Area of Science:

  • Atomic and Molecular Physics
  • Plasma Physics
  • Antimatter Physics

Background:

  • Positronium beams are valuable tools in various physics experiments.
  • Previous methods for generating positronium beams had limitations in control and tunability.

Purpose of the Study:

  • To describe the operation of a novel pulsed positronium beam.
  • To demonstrate the capability of tailoring positron beam characteristics for positronium formation.

Main Methods:

  • Utilized a two-stage buffer gas positron trap (BGT), also known as a Surko trap.
  • Employed charge exchange with atomic or molecular gases to convert a tailored positron beam into a positronium beam.
  • Leveraged the angular differential positronium production cross section for beam collimation.

Main Results:

  • Successfully generated a pulsed positronium beam.
  • Demonstrated control over the areal density and temporal spread of the positron beam.
  • Achieved an energy-tunable and collimated positronium beam.

Conclusions:

  • The described BGT-based method provides a versatile platform for generating tailored positronium beams.
  • This technique enhances the potential for precise experimental control in positronium-related research.