Toward a global search for new physics with isotope shifts

authored by

Elina Fuchs, Fiona Kirk, Agnese Mariotti, Jan Richter, Matteo Robbiati

Abstract

Isotope shifts have emerged as a sensitive probe of new bosons that couple to electrons and neutrons, and of nuclear structure. The recent Hz- or even sub-Hz-level isotope shift measurements across different elements call for a global assessment of all available data. In this work, we present the fit framework KIFIT that enables a combined analysis of isotope shift data from several elements, taking into account correlations. We provide a thorough comparison of analytical methods and the fit to analyze linear and nonlinear King plots and quantify their uncertainties. Finally, we provide recommendations for future measurements that could enhance the sensitivity to new physics and offer new insights into nuclear structure.

Organisation(s)

Institute of Theoretical Physics

External Organisation(s)

Università degli Studi di Milano
Deutsches Elektronen-Synchrotron (DESY)
Leibniz Universitätsgesellschaft
Physikalisch-Technische Bundesanstalt PTB
European Organization For Nuclear Research (CERN)

Type

Article

Journal

Physical Review A

Volume

112

Pages

522241-5222433

ISSN

2469-9926

Publication date

25.11.2025

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

Electronic version(s)

https://doi.org/10.1103/kzq9-x916 (Access: Open)