Hannover 2010 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 23: Poster II
A 23.21: Poster
Donnerstag, 11. März 2010, 16:30–19:00, Lichthof
Isotope shifts and Hyperfine structure of 212−214Ra+ — Gouri S. Giri, Bijaya K. Sahoo, Oscar O. Versolato, •Lotje W. Wansbeek, Lorenz Willmann, Hans W. Wilschut, Klaus Jungmann, and Rob G.E. Timmermans — Kernfysisch Versneller Instituut, University of Groningen, Netherlands
The availability of short lived Ra isotopes at the TRIµP facility of the KVI makes the study of atomic structure of these isotopes possible. 212−214Ra ions are trapped in a buffer-gas filled Paul trap. Isotope shifts and hyperfine structures of 212−214Ra+ for several transitions were obtained by laser spectroscopy. Ra+ is of particular interest for a most precise measurement of Atomic Parity Violation (APV), currently underway in our group. Such a measurement will provide a stringent test of the Standard Model of particle physics. However, the interpretation of APV measurements require the determination of the weak matrix elements to better than 1% accuracy in order to extract the weak charge (Weinberg angle). Currently, our calculations are accurate to some 3%. We therefore plan to exploit the fact that radium has a wide range of isotopes by looking at the ratio E1APV/ E1’APV for two -or more- isotopes, and thus canceling atomic uncertainties. Here, nuclear structure effects start to play a role. The extracted isotope shifts and hyperfine interactions provide indispensable information. In addition, the measured hyperfine structure of 213Ra+ is of particular interest for the proposed Radium single ion clock.