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Second-order hyperfine structure and its impact on new physics searches using isotope shift spectroscopy
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Recent precision isotope shift spectroscopy experiments have reported King plot non-linearities that may uncover previously hidden nuclear properties or hint at new force-carrying bosons. Interpreting the data requires many isotope pairs, but sufficient stable spin-zero nuclei are not always available. In this paper we consider the use of isotopes with non-zero nuclear spin for these studies. We confirm that observed King plot non-linearity in strontium is explained by second-order hyperfine shift in the fermionic nucleus, and we discuss the limitations of using Yb isotopes with non-zero spin in King plot studies. By introducing a specific difference of two isotopes with nuclear spin, we allow for a promising addition to future experimental schemes.
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Cited by 1 Pith paper
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Towards a Global Search for New Physics with Isotope Shifts
kifit, a new fit framework, combines isotope shift data from multiple elements into global constraints on new boson couplings to electrons and neutrons.
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