Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 30: Precision spectroscopy of atoms and ions III (with Q)

A 30.3: Vortrag

Donnerstag, 26. März 2015, 11:30–11:45, M/HS1

Light Shifts: Measuring Atomic Parity Violation in Single Trapped Ions — •Amita Mohanty, Elwin A. Dijck, Mayerlin Nunez Portela, Nivedya Valappol, Andrew T. Grier, Steven Hoekstra, Klaus Jungmann, and Lorenz Willmann — Van Swinderen Institute, University of Groningen, The Netherlands

Light shifts permit the mapping of weak interaction effects onto the energy splitting of the magnetic sub-levels in Ra+. A precise measurement of atomic parity violation (APV) provides for the determination of the weak mixing angle (sin2 ΘW), the Standard Model parameter which describes the connection between the electromagnetic and weak interactions. APV is also sensitive to light dark matter bosons, e.g dark Z bosons with masses below a few 100 MeV. For the experiment, localization of a single ion within a fraction of an optical wavelength in two orthogonal light fields of known polarization is required in order to disentangle the electromagnetic and weak contributions to the light shift. The heavy alkaline earth ion Ra+ is very well suited for such experiments because the APV signal scales significantly stronger than with Z3. Ba+ serves as a precursor and the precise determination of the light shift in the 5d2D3/2−6s2S1/2 transition is the next step towards the Ra+ ion APV experiment.

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