Conveners
Poster session: flash talks followed by discussion
- Ferenc Siklér (Wigner RCP, Budapest (HU))
The g-factor of bound electrons can be measured and calculated with high
accuracy. Comparisons between the theoretical and experimental values of the
g-factor allow precision tests of QED in the presence of strong electric
background fields and the determination of fundamental constants.
We present the status of our ongoing calculations of the two-loop self-energy
correction to the g-factor...
The molecular hydrogen ion H2+ is a promising candidate for fundamental metrology. Measuring one or several rovibrational transition frequencies at the few-10-12 accuracy level would provide an independent measurement of the proton-to-electron mass ratio mp/me and may shed light on the proton radius puzzle [1].
This poster will report on recent progress towards this goal. We aim at measuring...
Nuclear properties of thorium offer an opportunity for a number of novel applications,
such as direct laser excitation of the nucleus in the case of $^{229}$Th, which may serve for the construction of a nuclear clock, and also for testing fundamental symmetries [1-4]. In the framework of the Trapping And Cooling of Thorium Ions with Calcium (TACTICa) collaboration, we present loading and...
Bethe logarithm is a component of one of the leading quantum electrodynamic energy correction for atoms and molecules. This correction is of the order of $\alpha^{3}$.
A method for calculating the Bethe logarithm is presented. It is an alternative to the method of Schwartz \cite{Schwartz} which has been used in most of the atomic and molecular calculations. The present method was introduced...
The nonrelativistic ionization energy levels of a helium atom are calculated for S, P, D and F states. The calculations are based on the variational method of "exponential" expansion. The convergence of the calculated energy levels is studied as a function of the number of basis functions N. This allows us to claim that the obtained energy values (including the values for the states with a...
Recent advances of Doppler-free rovibrational spectroscopy of HD+ ions [1,2] underline the high potential of these systems for accurate tests of molecular theory and determination of fundamental constants. However, analysis of experimental data is made more complex by the hyperfine structure. Measurement of a sufficient number of hyperfine components is required in order to extract a...
The measurement of the masses and magnetic moments of the antiproton and the proton is a sensitive test of CPT invariance and the determination of fundamental constants. In our experiments we store and detect a single (anti)proton in cryogenic Penning traps with storage times longer than one year. We have performed the most precise comparison of the proton and antiproton charge-to-mass ratios...
The $g$ factor of bound electrons in light and medium-light hydrogen-like ions (e.g. C, Si) has been measured with an accuracy of a few parts in $10^{11}$ [S. Sturm et al., Nature 506, 467 (2014)]. Experiments such as ALPHATRAP and HITRAP aim at reaching this accuracy with heavy, few-electron ions, motivating the evaluation of two-loop radiative corrections.
We calculate a specific set of...
In 2017 a small group of researchers from Wigner Research Centre for Physics of the Hungarian Academy of Sciences, Department of Geodesy and Surveying of Budapest University of Technology and Economics (BME), Society for the Unity of Science and Technology (SUST), involving the Department of Control Engineering and Information Technology of BME and other organizations, departments and experts...
An original AutERBal type Eötvös balance is presented. The balance is operational, has Eötvös sensitivity 1 and was originally designed as a portable device for geophysical measurements.
