Evidence For The Production Of Slow Antiprotonic Hydrogen In Vacuum

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We present evidence showing how antiprotonic hydrogen, the quasistable antiproton-proton (pbar-p) bound system, has been synthesized following the interaction of antiprotons with the hydrogen molecular ion (H2+) in a nested Penning trap environment.

• From a careful analysis of the spatial distributions of antiproton annihilation events, evidence is presented for antiprotonic hydrogen production with sub-eV kinetic energies in states around n=70, and with low angular momenta.
• The slow antiprotonic hydrogen may be studied using laser spectroscopic techniques.