Linear Stark Shifts to Measure the Fr Weak Nuclear Charge with Small Atom Samples

Abstract

We study the chirality of ground-state alkali atoms in E and B fields, dressed with a circularly-polarized laser beam close-detuned from an E-field-assisted forbidden transition, such as 7S-8S in Fr. We predict a parity violating energy shift of their sublevels, linear in E, and the weak nuclear charge Q_W$.Adressingbeamof10kW/cm$^2$at506nmproducesashiftof$\sim100 μ$HzatE=100V/cm,B$\gtrsim$30mG.Itshouldbeobservablewith$\sim 10^4$Fratomsconfinedinanopticaldipoletrap.Wediscussoptimalconditions,parameterreversalsandacalibrationproceduretomeasure$Q_W$.

4 pages, 1 table

References in corpus (2)

• Testing the Standard Model by precision measurement of the weak charges of quarks
• A linear Stark shift in dressed atoms as a signal to measure a nuclear anapole moment with a cold atom fountain or interferometer

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• Calculation of parity non-conserving optical rotation in iodine at 1315 nm
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