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T: Fachverband Teilchenphysik
T 68: Poster
T 68.1: Poster
Tuesday, March 25, 2014, 16:45–19:00, ReWi EG
Atomic Parity Violation measurement in a single trap Ra+ ion to determine the Weinberg angle — •Mayerlin Nunez Portela, Elwin A. Dijck, Amita Mohanty, Nivedya Valappol, Oliver Boell, Klaus Jungmann, Cornelis J. G Onderwater, Sophie Schlesser, Rob G. E. Timmermans, Lorenz Wilmann, and Hans W. Wilschut — University of Groningen, FWN, Zernikelaan 25, NL-9747AA Groningen
A single trapped Ra+ ion is excellently suited for a precision measurement of the Weinberg mixing angle at low momentum transfer and thereby testing the electroweak running. Sensitivity exists also to dark matter. The absolute frequencies of the atomic transition 7s2S1/2-7d2D3/2 at wavelength 828 nm has been determined in 212−214Ra+ to better than 19 MHz with laser spectroscopy on small samples of ions trapped in a linear Paul trap. The upcoming measurement of the Weinberg angle (sin2ΘW) requires the localization of one single ion of Ra+ within a fraction of an optical wavelength. Current experiments are focused on trapping and on laser spectroscopy in a single Ba+ ion as a precursor for Ra+. Work towards single ion trapping of Ra+, including the preparation of an offline 223Ra source is in progress. Most elements requiered for the parity measurement in single Ra+ ion are also well suited for utilization as a most stable optical clock.