High-Precision Determination of g Factors and Masses of ^{20}Ne^{9+} and ^{22}Ne^{9+}

F Heiße; M Door; T Sailer; P Filianin; J Herkenhoff; C M König; K Kromer; D Lange; J Morgner; A Rischka; Ch Schweiger; B Tu; Y N Novikov; S Eliseev; S Sturm; K Blaum

doi:10.1103/PhysRevLett.131.253002

High-Precision Determination of g Factors and Masses of ^{20}Ne^{9+} and ^{22}Ne^{9+}

Phys Rev Lett. 2023 Dec 22;131(25):253002. doi: 10.1103/PhysRevLett.131.253002.

Authors

F Heiße¹, M Door¹, T Sailer¹, P Filianin¹, J Herkenhoff¹, C M König¹, K Kromer¹, D Lange¹, J Morgner¹, A Rischka¹, Ch Schweiger¹, B Tu¹, Y N Novikov^{2

3}, S Eliseev¹, S Sturm¹, K Blaum¹

Affiliations

¹ Max-Planck-Institut für Kernphysik, Heidelberg, Germany.
² Kurchatov Institute-PNPI, 188300 Gatchina, Russia.
³ Saint Petersburg State University, 199034 Saint Petersburg, Russia.

PMID: 38181339
DOI: 10.1103/PhysRevLett.131.253002

Abstract

We present the measurements of individual bound electron g factors of ^{20}Ne^{9+} and ^{22}Ne^{9+} on the relative level of 0.1 parts per billion. The comparison with theory represents the most stringent test of bound-state QED in strong electric fields. A dedicated mass measurement results in m(^{20}Ne)=19.992 440 168 77(9) u, which improves the current literature value by a factor of 18, disagrees by 4 standard deviations, and represents the most precisely measured mass value in atomic mass units. Together, these measurements yield an electron mass on the relative level of 0.1 ppb with m_{e}=5.485 799 090 99(59)×10^{-4} u as well as a factor of seven improved m(^{22}Ne)=21.991 385 098 2(26) u.