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25 April 2024

» arxiv » 1911.4342

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Rydberg-positronium velocity and self-ionization studies in 1T magnetic field and cryogenic environment
M. Antonello ; A. Belov ; G. Bonomi R. S. Brusa ; M. Caccia ; A. Camper ; R. Caravita ; F. Castelli ; G. Cerchiari ; D. Comparat ; G. Consolati ; A. Demetrio ; L. Di Noto ; M. Doser ; M. Fani ; R. Ferragut ; S. Gerber ; A. Gligorova ; F. Guatieri ; P. Hackstock ; S. Haider ; A. Hinterberger ; H. Holmestad ; A. Kellerbauer ; O. Khalidova ; D. Krasnicky ; V. Lagomarsino ; C. Malbrunot ; S. Mariazzi ; G. Nebbia ; P. Nedelec ; M. Oberthaler ; D. Pagano ; L. Penasa ; F. Prelz ; B. Rienaecker ; A. Rotondi ; H. Sandaker ; R. Santoro ; L. Smestad ; G. Testera ; I. C. Tietje ; E. Widmann ; T. Wolz ; P. Yzombard ; C. Zimmer ; N. Zurlo ;
Date:	11 Nov 2019
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 $n=3$ state. One direction of velocity was measured via Doppler-scan of this $n=3$-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 effects was also quantified by using the same MCP-imaging technique for Rydberg positronium with an effective principal quantum number $n_{eff}$ 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.
Source:	arXiv, 1911.4342
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