Production of antihydrogen atoms by 6 keV antiprotons through a   positronium cloud

P. Adrich; P. Blumer; G. Caratsch; M. Chung; P. Clad\'e; P. Comini; P.; Crivelli; O. Dalkarov; P. Debu; A. Douillet; D. Drapier; P. Froelich; N.; Garroum; S. Guellati-Khelifa; J. Guyomard; P-A. Hervieux; L. Hilico; P.; Indelicato; S. Jonsell; J-P. Karr; B. Kim; S. Kim; E-S. Kim; Y.J. Ko; T.; Kosinski; N. Kuroda; B.M. Latacz; B. Lee; H. Lee; J. Lee; E. Lim; L. Liszkay,; D. Lunney; G. Manfredi; B. Mansouli\'e; M. Matusiak; V. Nesvizhevsky; F. Nez,; S. Niang; B. Ohayon; K. Park; N. Paul; P. P\'erez; C. Regenfus; S. Reynaud,; C. Roumegou; J-Y. Rouss\'e; Y. Sacquin; G. Sadowski; J. Sarkisyan; M. Sato,; F. Schmidt-Kaler; M. Staszczak; K. Szymczyk; T.A. Tanaka; B. Tuchming; B.; Vallage; A. Voronin; D.P. van der Werf; D. Won; S. Wronka; Y. Yamazaki; K-H.; Yoo; P. Yzombard

arXiv:2306.15801·hep-ex·February 6, 2024

Production of antihydrogen atoms by 6 keV antiprotons through a positronium cloud

P. Adrich, P. Blumer, G. Caratsch, M. Chung, P. Clad\'e, P. Comini, P., Crivelli, O. Dalkarov, P. Debu, A. Douillet, D. Drapier, P. Froelich, N., Garroum, S. Guellati-Khelifa, J. Guyomard, P-A. Hervieux, L. Hilico, P., Indelicato, S. Jonsell, J-P. Karr, B. Kim, S. Kim, E-S. Kim

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TL;DR

This paper reports the first successful production of an antihydrogen beam via charge exchange between 6.1 keV antiprotons and positronium, demonstrating a new method for antihydrogen generation at CERN.

Contribution

It introduces a novel technique for producing antihydrogen atoms using low-energy antiprotons and positronium, advancing experimental capabilities in antimatter research.

Findings

01

Detected antihydrogen production with 3-4 sigma significance.

02

First demonstration of antihydrogen beam production at 6 keV energy.

03

Utilized positronium cloud and low-energy antiprotons in the process.

Abstract

We report on the first production of an antihydrogen beam by charge exchange of 6.1 keV antiprotons with a cloud of positronium in the GBAR experiment at CERN. The antiproton beam was delivered by the AD/ELENA facility. The positronium target was produced from a positron beam itself obtained from an electron linear accelerator. We observe an excess over background indicating antihydrogen production with a significance of 3-4 standard deviations.

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