g factor of lithiumlike silicon 28Si11+

TL;DR

This paper reports a highly precise measurement of the g factor of lithiumlike silicon 28Si11+ using a triple-Penning trap, providing a stringent test of bound-state QED and relativistic many-electron calculations.

Contribution

The study presents the most accurate experimental g factor measurement for lithiumlike silicon and compares it with advanced theoretical predictions, including the first rigorous two-photon exchange correction.

Findings

Measured g factor: 2.0008898899(21)

Theoretical g factor: 2.000889909(51)

Excellent agreement between experiment and theory

Abstract

The g factor of lithiumlike 28Si11+ has been measured in a triple-Penning trap with a relative uncertainty of 1.1x10^{-9} to be g_exp=2.0008898899(21). The theoretical prediction for this value was calculated to be g_th=2.000889909(51) improving the accuracy to 2.5x10^{-8} due to the first rigorous evaluation of the two-photon exchange correction. The measured value is in excellent agreement with the state-of-the-art theoretical prediction and yields the most stringent test of bound-state QED for the g factor of the 1s^22s state and the relativistic many-electron calculations in a magnetic field.