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Detecting positron-atom bound states through resonant annihilation.

V A Dzuba1, V V Flambaum, G F Gribakin

  • 1School of Physics, University of New South Wales, Sydney 2052, Australia. v.dzuba@unsw.edu.au

Physical Review Letters
|January 15, 2011
PubMed
Summary

Researchers propose a new method to detect positron-atom bound states using enhanced positron annihilation via electronic Feshbach resonances. This technique is applicable to various transition-metal atoms, aiding in the study of exotic matter.

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Area of Science:

  • Atomic and Molecular Physics
  • Quantum Chemistry
  • Materials Science

Background:

  • Positron-atom interactions are crucial for understanding fundamental physics and chemistry.
  • Identifying conditions for positron-atom bound states is a significant challenge.
  • Electronic Feshbach resonances offer a potential mechanism for positron binding.

Purpose of the Study:

  • To propose a novel method for detecting positron-atom bound states.
  • To identify specific elements likely to form such bound states.
  • To provide estimates for the binding energies of these exotic states.

Main Methods:

  • Observing enhanced positron annihilation rates.
  • Utilizing electronic Feshbach resonances at electron-volt energies.
  • Applying the method to a selection of open-shell transition-metal atoms.

Main Results:

  • The proposed method enables the detection of positron-atom bound states.
  • Fe, Co, Ni, Tc, Ru, Rh, Sn, Sb, Ta, W, Os, Ir, and Pt are identified as candidate atoms.
  • Estimates of binding energies for these positron-atom systems are provided.

Conclusions:

  • Enhanced positron annihilation via Feshbach resonances is a viable detection method.
  • Several transition metals are predicted to form stable positron-atom bound states.
  • This research opens new avenues for exploring exotic atomic and molecular structures.