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Measuring the Fr weak nuclear charge by observing a linear stark shift with small atomic samples.

Marie-Anne Bouchiat1

  • 1Département de Physique de l'Ecole Normale Supérieure, F-75231 Paris Cedex 05, France.

Physical Review Letters
|June 4, 2008
PubMed
Summary

This study investigates atomic chirality in alkali atoms using electric and magnetic fields. Researchers predict and discuss measuring parity-violating energy shifts, offering insights into fundamental physics.

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Area of Science:

  • Atomic Physics
  • Quantum Optics
  • Fundamental Symmetries

Background:

  • Chirality in ground-state alkali atoms is sensitive to external fields.
  • Parity-violating effects are crucial for understanding fundamental interactions.
  • Francium (Fr) atoms offer unique properties for studying these phenomena.

Purpose of the Study:

  • To investigate the chirality of alkali atoms in combined electric (E) and magnetic (B) fields.
  • To predict and analyze parity-violating energy shifts in atomic sublevels.
  • To establish a method for measuring the weak nuclear charge (Q_W) in Francium.

Main Methods:

  • Dressing alkali atoms with a circularly-polarized laser beam near a forbidden transition (7S-8S in Fr).
  • Applying static electric and magnetic fields.
  • Calculating energy shifts dependent on E and Q_W.

Main Results:

  • Predicted parity-violating energy shifts are linear in E and Q_W.
  • A shift of ~100 microHz is predicted for specific experimental conditions (10 kW/cm^2, 506 nm beam, E=100 V/cm, B=50 mG).
  • The predicted shifts are observable with ~10^4 Fr atoms in an optical dipole trap.

Conclusions:

  • The study demonstrates a feasible method for observing parity violation in alkali atoms.
  • The proposed technique allows for the measurement of the weak nuclear charge (Q_W).
  • Optimal experimental conditions and calibration procedures are discussed for accurate measurements.