Physical Review Letters · 1994 · 63 citations · 9 references
Natural SciencesPhysicsNuclear ChemistryNuclear PhysicsSpectroscopyLaser PhysicsLaser SpectroscopyNuclear DecayAtomic Level LifetimesDecay Chain AnalysisExcited StatesLifetimesMetastable State DecayMetastable StatesNuclear Level LifetimesNuclear Lifetimes
Laser studies of metastable antiprotonic helium atoms, which we recently initiated by observing a sharp increase of the antiproton annihilation rate induced by laser-stimulated resonant transitions, have been extended. With a single laser tuned to the resonance already found at 597.26 nm, we have now established the time dependence of the upper state population. With two lasers ignited at variable time separation, we also studied the feeding of the upper state from higher atomic levels. The initial populations and level lifetimes of excited exotic atoms were determined.
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Discovery of antiproton trapping by long-lived metastable states in liquid helium
M. Iwasaki, Seitaro Nakamura, K. Shigaki et al. · Physical Review Letters · 1991 · 225 citations
Formation of long-lived gas-phase antiprotonic helium atoms and quenching by H2
Toshitsugu Yamazaki, E. Widmann, R. Hayano et al. · Nature · 1993 · 172 citations
On the absorption of negative pions by liquid helium
G. T. Condo · Physics Letters · 1964 · 171 citations