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Experiments with a high-density positronium gas.

D B Cassidy1, S H M Deng, R G Greaves

  • 1Department of Physics, University of California, Riverside, California 92521-0413, USA.

Physical Review Letters
|December 31, 2005
PubMed
Summary
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We created a dense positronium (Ps) gas and observed a 33% decrease in its intensity at high densities. This is likely due to spin exchange and molecule formation from colliding Ps atoms.

Area of Science:

  • Atomic physics
  • Materials science
  • Quantum chemistry

Background:

  • Positronium (Ps) is a unique atomic system composed of an electron and a positron.
  • Understanding Ps interactions is crucial for fields like materials science and fundamental physics.

Purpose of the Study:

  • To create and study a high-density gas of interacting positronium atoms.
  • To investigate the behavior and lifetime of positronium under high-density conditions.

Main Methods:

  • Irradiating nanoporous silica films with intense positron bursts.
  • Measuring positronium lifetime using a novel single-shot technique.
  • Compressing positrons to high densities (3.3 x 10^10 cm^-2).

Main Results:

Related Experiment Videos

  • Observed a significant decrease (33%) in the apparent intensity of the orthopositronium lifetime component at high positron densities.
  • Implied an effective cross section of 2.9 x 10^-14 cm^-2 for the observed quenching process.

Conclusions:

  • High densities of positronium lead to interaction-induced quenching.
  • Spin exchange and the formation of Ps2 molecules are proposed mechanisms for this quenching.
  • The findings provide insights into the behavior of exotic atoms in dense environments.