Hannover 2020 – scientific programme

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A: Fachverband Atomphysik

A 20: Precision spectroscopy of atoms and ions III

A 20.6: Talk

Wednesday, March 11, 2020, 15:30–15:45, f303

Higher order isotope shifts in highly charged ions — •Robert A. Müller^1,2, Vladimir A. Yerokhin³, and Andrey Surzhykov^1,2 — ¹Physikalisch-Technische Bundesanstalt, Germany — ²Technische Universität Braunschweig, Germany — ³Peter the Great St. Petersburg Polytechnic University, Russia

A common way to search for physics beyond the standard model, is the investigation of quantities that can be both measured and calculated to a very high precision. One of these quantities is the isotope shift ratio of two transitions. As a function of the number of nucleons A this ratio results in the so-called King Plot. In first order of the electron-nucleus mass ratio (m_e/M_A) the King Plot is strictly linear. Modern spectroscopy, however, is able to measure isotope shifts up to a precision, where higher order effects need consideration [1]. These effects manifest as nonlinearities in the King Plot. In this contribution we will discuss the quadratic mass shift that yields the dominating second-order isotope shift in light atoms and ions. Our calculations show that this shift can cause deviations from a linear King Plot up to several kHz. Moreover we use our theory to investigate King Plot nonlinearities introduced by a speculated new light boson and use existing measurements to restrict the properties of this particle [2].

[1] Miyake et al., Phys. Rev. Res. 1, 033113 (2019)

[2] Yerokhin et al., arXiv:1910.05524 (2019)