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Q: Fachverband Quantenoptik und Photonik

Q 61: Precision Spectroscopy VI - neutrals and ions (joint session A/Q)

Q 61.7: Vortrag

Donnerstag, 8. März 2018, 15:45–16:00, K 1.016

Ba⁺ Isotope shift studies in preparation of atomic parity violation measurement — •Nivedya Valappol¹, Elwin Dijck¹, Aswin Hofsteenge¹, Olivier Grasdijk¹, Amita Mohanty², Mayerlin Portela³, Lorenz Willmann¹, and Klaus Jungmann¹ — ¹Van Swinderen Institute, FSE, University of Groningen, The Netherlands — ²NISER, Bhubaneswar, India — ³Laboratorio de Òptica Cuàntica, Universidad de los Andes, Bogotà D.C., Colombia

The Ba⁺ ion, has a structure of spectral lines similar to heavy single valence electron alkali atoms. It is precisely studied by laser spectroscopy in presence of several light fields in order to prepare for a measurement of atomic parity violation (APV). Measurements in heavy alkali earth ions (e.g. Ba⁺ and Ra⁺) permit the precise determination of the weak mixing (Weinberg) angle sin²θ_W with improvement over the previous best measurement in neutral Cs by a factor of 5 in a week of actual measurement time. The transition frequencies for the 6s²S_1/2 - 6p²P_1/2, 6p²P_1/2 - 5d²D_3/2 and 6s²S_1/2 - 5d²D_3/2 transitions in ¹³⁸Ba⁺ have been measured to 10⁻¹⁰ relative accuracy employing a line shape model for single ions in a radio frequency Paul trap [1]. These measurements have been extended to ^134,136Ba⁺. Together with a determination of the lifetime of the excited 5d²D_5/2 state these measurements provide for a stringent test of calculations, the accuracy of which is pivotal for a determination of sin²θ_W. The observed lifetime is 25.8(5)s. Being about 5s shorter than previous measurements and calculations agreeing with them, it provides for a puzzle.

[1] E. A. Dijck et al., Phy. Rev. A 91, 060501(R)(2015)