PreprintCC BY-NC-ND 4.0HAL27 Sep 2026

First measurement of the antihydrogen production cross section through the charge-exchange reaction of low-energy antiprotons with orthopositronium

P Adrich
I Belosevic
M Chung
P Cladé
P Comini
P Crivelli
P Debu
A Douillet
S Geffroy
S Guellati-Khelifa
P Guichard
P.-A Hervieux

32 more authors

L Hilico
P Indelicato
S Jonsell
J.-P Karr
B Kim
S Kim
E.-S Kim
N Kuroda
B Lee
L Liszkay
D Lunney
G Manfredi
B Mansoulié
V Martimort
M Matusiak
V Nesvizhevsky
F Nez
K Park
N Paul
E Perez
P Pérez
C Regenfus
C Roumegou
J.-Y Roussé
F Schmidt-Kaler
K Szymczyk
T.A Tanaka
B Tuchming
D.P van der Werf
D Won
S Wronka
P Yzombard

Abstract

The GBAR experiment has measured the formation rate of antihydrogen from antiproton impact on a positronium cloud for antiproton kinetic energies of 4 and 6 keV. This is the first charge-exchange cross section measurement performed using antiproton beams, which are provided by the AD-ELENA facility at CERN. The measured cross section values are (14.1 ± 1.3 (stat) ^+2.2_−1.4 (sys)) × 10⁻¹⁶~cm² at 6.2 keV energy and (8.7 ± 2.4 (stat) ^+1.5_−0.09 (sys)) × 10⁻¹⁶~cm² at 4.15 keV energy, and agree with recent theoretical three-body calculations for antihydrogen formation. These measurements are an important input for experiments with antimatter, e.g the planned measurements of antihydrogen gravitational acceleration in the GBAR collaboration.

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BibTeX RIS

BibTeX

@misc{adrich2026first,
  title = {{First measurement of the antihydrogen production cross section through the charge-exchange reaction of low-energy antiprotons with orthopositronium}},
  author = {P Adrich and I Belosevic and M Chung and P Cladé and P Comini and P Crivelli and P Debu and A Douillet and S Geffroy and S Guellati-Khelifa and P Guichard and P.-A Hervieux and L Hilico and P Indelicato and S Jonsell and J.-P Karr and B Kim and S Kim and E.-S Kim and N Kuroda and B Lee and L Liszkay and D Lunney and G Manfredi and B Mansoulié and V Martimort and M Matusiak and V Nesvizhevsky and F Nez and K Park and N Paul and E Perez and P Pérez and C Regenfus and C Roumegou and J.-Y Roussé and F Schmidt-Kaler and K Szymczyk and T.A Tanaka and B Tuchming and D.P van der Werf and D Won and S Wronka and P Yzombard},
  howpublished = {HAL},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.33990},
  eprint = {2609.33990},
  archivePrefix = {arXiv},
  url = {https://hal.science/hal-05781873v1},
  note = {CC BY-NC-ND 4.0},
}

RIS

TY  - UNPB
TI  - First measurement of the antihydrogen production cross section through the charge-exchange reaction of low-energy antiprotons with orthopositronium
AU  - P Adrich
AU  - I Belosevic
AU  - M Chung
AU  - P Cladé
AU  - P Comini
AU  - P Crivelli
AU  - P Debu
AU  - A Douillet
AU  - S Geffroy
AU  - S Guellati-Khelifa
AU  - P Guichard
AU  - P.-A Hervieux
AU  - L Hilico
AU  - P Indelicato
AU  - S Jonsell
AU  - J.-P Karr
AU  - B Kim
AU  - S Kim
AU  - E.-S Kim
AU  - N Kuroda
AU  - B Lee
AU  - L Liszkay
AU  - D Lunney
AU  - G Manfredi
AU  - B Mansoulié
AU  - V Martimort
AU  - M Matusiak
AU  - V Nesvizhevsky
AU  - F Nez
AU  - K Park
AU  - N Paul
AU  - E Perez
AU  - P Pérez
AU  - C Regenfus
AU  - C Roumegou
AU  - J.-Y Roussé
AU  - F Schmidt-Kaler
AU  - K Szymczyk
AU  - T.A Tanaka
AU  - B Tuchming
AU  - D.P van der Werf
AU  - D Won
AU  - S Wronka
AU  - P Yzombard
PY  - 2026
DA  - 2026/09/27
PB  - HAL
DO  - 10.48550/arxiv.2609.33990
UR  - https://hal.science/hal-05781873v1
AB  - The GBAR experiment has measured the formation rate of antihydrogen from antiproton impact on a positronium cloud for antiproton kinetic energies of 4 and 6 keV. This is the first charge-exchange cross section measurement performed using antiproton beams, which are provided by the AD-ELENA facility at CERN. The measured cross section values are (14.1 ± 1.3 (stat) ^+2.2_−1.4 (sys)) × 10^−16~cm^2 at 6.2 keV energy and (8.7 ± 2.4 (stat) ^+1.5_−0.09 (sys)) × 10^−16~cm^2 at 4.15 keV energy, and agree with recent theoretical three-body calculations for antihydrogen formation. These measurements are an important input for experiments with antimatter, e.g the planned measurements of antihydrogen gravitational acceleration in the GBAR collaboration.
ER  -

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