International Conference on Precision Physics of Simple Atomic Systems

Session

Session 8

19 May 2026, 16:10

Festsaal (ÖAW)

57. Measurements of Muonic Helium Hyperfine Structure in High Magnetic Field at J-PARC MUSE

Patrick Strasser (KEK)

19/05/2026, 16:10

Talk

Muonic helium is an exotic, hydrogen-like atom formed when a negative muon replaces one of the two electrons in an ordinary helium atom. Its ground-state hyperfine structure (HFS), arising from the interaction between the magnetic moments of the negative muon and the remaining electron, is very similar to muonium HFS but inverted. The same microwave magnetic resonance technique used to measure...

41. Muon Penning Trap at J-PARC

Takayuki Yamazaki

19/05/2026, 16:30

Talk

At the J-PARC muon facility (MUSE), we have launched a new project to precisely measure muon properties, such as magnetic moment, mass, and lifetime, by confining muons in a Penning trap.
In our experiment, high-intensity pulsed muons are slowed down before entering a Penning trap. Ultra-slow positive muons can be generated efficiently by laser ionization of thermal muonium. In a Penning...

75. Multipole blackbody radiation shift in Rydberg states of hydrogen

Robert Potvliege (Durham University)

19/05/2026, 16:50

Talk

The  importance of accurately taking into account the energy level shifts due to the blackbody radiation (BBR) in high precision spectroscopy is well known. The work in this area tends to focus on the BBR shift of the ground state and low excited states in view of the needs of current and forthcoming experiments. An early and notable exception is Farley and Wing's calculation of the BBR shift...

79. Measurements of positronium compound binding energies

Alina Weiser (Austrian Academy of Sciences (AT))

19/05/2026, 17:10

Talk

Although theoretical studies predict the existence of more than thirty positronium compounds [1], experimental observation remains limited to the simplest systems, positronium hydride (PsH) [2] and deuteride (PsD) [3]. Ps compounds are relevant in multiple fields, including many-body quantum calculations [1], materials studies [3], and antihydrogen ion formation [4], but the lack of...