International Conference on Precision Physics of Simple Atomic Systems

Session

Session 10

20 May 2026, 11:00

Festsaal (ÖAW)

52. GRASIAN: First observation of quantum reflection of atomic hydrogen from a silicon mirror on the journey toward the first demonstration of gravitational quantum states of atoms

Carina Killian (Stefan Meyer Institute for Subatomic Physics, Austrian Academy of Sciences, Kegelgasse 27, Vienna, 1030, Austria)

20/05/2026, 11:00

Talk

A low energy particle confined by a horizontal reflective surface and gravity settles in gravitationally bound quantum states. These gravitational quantum states (GQS) were so far only observed with neutrons. However, the existence of GQS is predicted also for atoms.
The GRASIAN collaboration pursues the first observation of GQS of atoms, using a cryogenic hydrogen (H) beam. This endeavor is...

78. Gravitational and other shifts of whispering-gallery and gravitational state interference patterns of light neutral particles

Prof. Valery Nesvizhevsky (Institut Max von Laue - Paul Langevin)

20/05/2026, 11:30

Talk

We discuss small shifts in the interference patterns of gravitational and whispering gallery quantum states that can be observed with neutrons, atoms, antiatoms, muonium, positronium, and other
particles. A gravitational shift of interference patterns of neutron gravitational and whispering-gallery states can be easily observed with cold, very cold, or ultracold neutrons. The developed...

76. Recent developments in the LEMING experiment

Francesco Lancellotti (ETH Zurich)

20/05/2026, 12:00

Talk

The LEMING experiment aims to measure the gravitational interaction of muonium (Mu = μ⁺ + e⁻) and to perform next-generation laser spectroscopy. A high-intensity, subthermal vacuum muonium beam is produced via muon conversion in a thin layer of superfluid helium. This novel source enables sub-nanometer-sensitive measurements of muonium displacement due to gravitational acceleration and,...