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Generalized King linearity and new physics searches with isotope shifts

Julian C. Berengut1,*, Cédric Delaunay2,†, Amy Geddes1,‡, and Yotam Soreq3,§

  • 1School of Physics, University of New South Wales, Sydney, New South Wales 2052, Australia
  • 2Laboratoire d'Annecy-le-Vieux de Physique Théorique LAPTh, CNRS – Université Savoie Mont Blanc, BP 110, F-74941 Annecy-le-Vieux, France
  • 3Physics Department, Technion—Israel Institute of Technology, Haifa 3200003, Israel
  • *julian.berengut@unsw.edu.au
  • †cedric.delaunay@lapth.cnrs.fr
  • ‡a.geddes@unsw.edu.au
  • §soreqy@physics.technion.ac.il
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Phys. Rev. Research 2, 043444 – Published 31 December, 2020

DOI: https://doi.org/10.1103/PhysRevResearch.2.043444

Abstract

Atomic spectral lines for different isotopes are shifted, revealing a change in the properties of the nucleus. For spinless nuclei such isotope shifts for two distinct transitions are expected to be linearly related, at least at leading order in a change of the nuclear mass and charge distribution. Looking for a breaking of linearity in so-called King plots was proposed as a novel method to search for physics beyond the standard model. In the light of the recent experimental progress in isotope shift spectroscopy, the sensitivity of these searches will become limited by the determination of the isotope masses and/or by nuclear effects which may induce nonlinearities at an observable level. In this work, we propose two possible generalizations of the traditional King plot that overcome these limitations by including additional isotope shift measurements, thus significantly extending the new physics reach of King plots in a purely spectroscopy-driven approach.

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Phys. Rev. Research 2, 043444– Published 31 December, 2020
  • Received 25 May 2020
  • Accepted 15 December 2020
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