Bonn 2025 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 37: Poster – Highly Charged Ions and their Applications

A 37.5: Poster

Donnerstag, 13. März 2025, 17:00–19:00, Tent

The Positron Source at the Lsym Experiment — •Maria Pasinetti, Fabian Raab, Paul Holzenkamp, Andreas Thoma, Luca Falzoni, Bjoern-Benny Bauer, Sangeetha Sasidharan, and Sven Sturm — Max-Planck Institute for Nuclear Physics, 69117 Heidelberg, Germany

The Lsym experiment is a new cryogenic Penning trap experiment currently being designed at the Max-Planck-Institut fur Kernphysik of Heidelberg. The goal of Lsym is to conduct a stringent CPT test by comparing the properties of matter and antimatter with unprecedented precision by trapping simultaneously one electron and one positron in a Penning trap, thus performing a decoherence-free measurement. This project will present a few challenges, for instance the optimisation of positron production and accumulation, given a rather weak radioactive 22Na source (about 15 MBq). A positron trapping technique involving production of positronium atoms in a high Rydberg state is being tested; furthermore, an efficient detection method is being set up. As positrons follow a β+ decay energy spectrum, they must undergo a moderation stage before entering the trap: the positron is then cooled to the ground-state of motion in the center of the trap. This poster illustrates the principles and techniques that will be used for the positron source at Lsym.

Keywords: CPT; Penning trap; Positrons; Antimatter; Positronium