Probing New Bosons and Nuclear Structure with Ytterbium Isotope Shifts
Menno Door, Chih-Han Yeh, M. Heinz, Fiona Kirk, Chunhai Lyu, T. Miyagi, J. C. Berengut, Jacek Bieroń, K. Blaum, Laura S. Dreissen, S. Eliseev, P. Filianin, Melina Filzinger, Elina Fuchs, Henning A. Fürst, Gediminas Gaigalas, Zoltán Harman, Jost Herkenhoff, Nils Huntemann, Christoph H. Keitel, Kathrin Kromer, Daniel Lange, Alexander Rischka, Christoph Schweiger, A. Schwenk, Noritaka Shimizu, T. E. Mehlstäubler
Abstract
In this Letter, we present mass-ratio measurements on highly charged Yb^{42+} ions with a precision of 4×10^{-12} and isotope-shift measurements on Yb^{+} on the ^{2}S_{1/2}→^{2}D_{5/2} and ^{2}S_{1/2}→^{2}F_{7/2} transitions with a precision of 4×10^{-9} for the isotopes ^{168,170,172,174,176}Yb. We present a new method that allows us to extract higher-order changes in the nuclear charge distribution along the Yb isotope chain, benchmarking ab initio nuclear structure calculations. Additionally, we perform a King plot analysis to set bounds on a fifth force in the keV/c^{2} to MeV/c^{2} range coupling to electrons and neutrons.