Rydberg-positronium velocity and self-ionization studies in 1T magnetic field and cryogenic environment
Abstract
We characterized the pulsed Rydberg-positronium production inside the AEgIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) apparatus in view of antihydrogen formation by means of a charge exchange reaction between cold antiprotons and slow Rydberg-positronium atoms. Velocity measurements on positronium along two axes in a cryogenic environment (10K) and in 1T magnetic field were performed. The velocimetry was done by MCP-imaging of photoionized positronium previously excited to the state. One direction of velocity was measured via Doppler-scan of this -line, another direction perpendicular to the former by delaying the exciting laser pulses in a time-of-flight measurement. Self-ionization in the magnetic field due to motional Stark effect was also quantified by using the same MCP-imaging technique for Rydberg positronium with an effective principal quantum number ranging between 14 and 22. We conclude with a discussion about the optimization of our experimental parameters for creating Rydberg-positronium in preparation for an efficient pulsed production of antihydrogen.
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Cite
@article{arxiv.1911.04342,
title = {Rydberg-positronium velocity and self-ionization studies in 1T magnetic field and cryogenic environment},
author = {M. Antonello and A. Belov and G. Bonomi R. S. Brusa and M. Caccia and A. Camper and R. Caravita and F. Castelli and D. Comparat and G. Consolati and L. Di Noto and M. Doser and M. Fani and R. Ferragut and J. Fesel and S. Gerber and A. Gligorova and L. T. Glöggler and F. Guatieri and S. Haider and A. Hinterberger and O. Khalidova and D. Krasnicky and V. Lagomarsino and C. Malbrunot and S. Mariazzi and V. Matveev and S. R. Müller and G. Nebbia and P. Nedelec and L. Nowak and M. Oberthaler and E. Oswald and D. Pagano and L. Penasa and V. Petracek and F. Prelz and B. Rienäcker and O. M. Røhne and A. Rotondi and H. Sandaker and R. Santoro and G. Testera and I. C. Tietje and T. Wolz and C. Zimmer and N. Zurlo},
journal= {arXiv preprint arXiv:1911.04342},
year = {2022}
}