International Conference on Precision Physics of Simple Atomic Systems

Session

Session 1

18 May 2026, 09:00

Festsaal (ÖAW)

114. Welcome

Eberhard Widmann (Austrian Academy of Sciences (AT))

18/05/2026, 09:00

12. Mass of helium-4

Edmund Myers (Florida State University)

18/05/2026, 09:10

Invited Talk

We present measurements of the cyclotron frequency ratios $^{4}$He$^{+}$/D$_{2}^{+}$, $^{4}$He$^{+}$/H$_{2}$D$^{+}$, and $^{4}$He$^{+}$/$^{12}$C$^{3+}$ using a cryogenic Penning ion trap [1,2]. Our results clearly differentiate between an earlier measurement of the mass of $^{4}$He by the University of Washington [3] and a more recent measurement by the LIONTRAP collaboration [4] in favor of...

83. Precision Antiproton Spectroscopy at BASE

Jonathan Morgner (CERN)

18/05/2026, 09:50

Invited Talk

The pronounced imbalance between matter and antimatter in the universe motivates high precision comparisons of fundamental properties of matter–antimatter conjugates. At CERN’s Antiproton Decelerator, the BASE collaboration performs such tests using cryogenic Penning traps. We have achieved the most precise proton–antiproton charge to mass ratio comparison to date, with a fractional...