Conveners
Session 1
- Savely Karshenboym (LMU, MPQ, Pulkovo)
After a brief review of atomic mass measurements on light ions with the Florida State University Precision Penning trap, we will present our progress on measurements involving $^{4}$He. This is motivated by future measurements of the electron mass via the g-factor of $^{4}$He$^{+}$, and the discrepancy between the two most precise literature values for the atomic mass of $^{4}$He.
The masses of lightest nuclei form a network of parameters used in fundamental physics. The mass difference of $\mathrm{T}$ and $^{3}\mathrm{He}$, for example, must be known with the highest precision to cross-check the systematic uncertainties in experiments
such as KATRIN or Project-8, which study $\beta$-decay of $\mathrm{T}$ to set a limit on the $\overline{\nu}_e$ mass. A Penning-trap...
At our Penning-trap experiment µTEx in Heidelberg, Germany, we measure the ground-state hyperfine- and fine-structure splitting of light, hydrogenlike ions in a magnetic field of 5.7T [1]. From these high-precision measurements, the bound-electron and shielded nuclear g-factors as well as the hyperfine-structure constant are extracted [2]. In combination with theory, this allows to test QED,...
Light heliumlike systems are ideal cases to benchmark state of the art atomic and nuclear theory as their nuclei exhibit interesting cluster and halo structures and their atomic structure is accessible for high-precision ab initio calculations. With recent progress in nonrelativistic quantum electrodynamics (NRQED) calculations [1], even an all-optical extraction of absolute nuclear charge...
