Abstract
We descrbe how protonium, the quasi-stable antiproton-proton bound system, has been synthesized following the interaction of antiprotons with the molecular ion \( {\rm H}_2^+\) in a nested Penning trap environment. From a careful analysis of the spatial distributions of antiproton annihilation events in the ATHENA experiment, evidence is presented for protonium production with sub-eV kinetic energies in states around n = 70, with low angular momenta. This work provides a new two-body system for studies using laser spectroscopic techniques.
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Zurlo, N., Amoretti, M., Amsler, C. et al. Production of slow protonium in vacuum. Hyperfine Interact 172, 97–105 (2006). https://doi.org/10.1007/s10751-007-9529-0
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DOI: https://doi.org/10.1007/s10751-007-9529-0