Parity violation in laser-cooled atomic francium at TRIUMF

Seth Aubin (William & Mary)
Event Date and Time: 
Thu, 2015-07-02 14:00 - 15:00
TRIUMF Auditorium

Parity violation is a unique identifying signature for the weak interaction and thus provides a powerful probe of the weak force in the presence of electromagnetic and strong nuclear interactions. Atomic parity non-conservation (PNC) experiments use parity-forbidden optical transitions for unique high-precision tests of the electroweak sector of the standard model at very low energies. Alternatively, microwave measurements of spin-dependent atomic PNC can determine the nuclear anapole moment, a parity-violating electromagnetic moment induced by the weak interaction between nucleons. We present progress on the FrPNC collaboration’s apparatus for measuring atomic PNC and the nuclear anapole moment in a string of laser-cooled francium isotopes at TRIUMF. Recent measurements and analysis of the hyperfine anomaly in a series of isotopes identify a favorable set (207-213Fr) with a relatively simple nuclear structure for the valence nucleons; these nucleons are thought to play a key role in generating the anapole moment.

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