First observation of laser-induced resonant annihilation in metastable antiprotonic helium atoms

Journal Article · Mon Feb 21 04:00:00 EST 1994 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.72.1180· OSTI ID:5008382

Morita, N; Kumakura, M ^[1]; Yamazaki, T; Widmann, E; Masuda, H; Sugai, I ^[2]; Hayano, R S; Maas, F E; Torii, H A ^[3]; Hartmann, F J; Daniel, H; von Egidy, T; Ketzer, B; Mueller, W; Schmid, W ^[4]; Horvath, D ^[5]; Eades, J ^[6]

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1. Institute for Molecular Science, Myodaiji, Okazaki 444 (Japan)
2. Institute for Nuclear Study, University of Tokyo, 3-2-1 Midori-cho, Tanashi, Tokyo 188 (Japan)
3. Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113 (Japan)
4. Physik-Department, Technische Universitaet Muenchen, D-85747 Garching (Germany)
5. KFKI Research Institute for Particle and Nuclear Physics, H-1525 Budapest (Hungary)
6. CERN, CH-1211 Geneva 23 (Switzerland)

We have observed the first laser-induced resonant transitions in antiprotonic helium atoms. These occur between metastable states and Auger dominated short lived states, and show that the anomalous longevity of antiprotons previously observed in helium media results from the formation of high-[ital n] high-[ital l] atomic states of [ital [bar p]]He[sup +]. The observed transition with vacuum wavelength 597.259[plus minus]0.002 nm is tentatively assigned to ([ital n],[ital l])=(39,35)[r arrow](38,34).

• OSTI ID: 5008382
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 72:8; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

664500* -- Special Atoms & Molecules-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR MOMENTUM
ANNIHILATION
ANTIBARYONS
ANTIMATTER
ANTINUCLEI
ANTINUCLEONS
ANTIPARTICLES
ANTIPROTONS
AUGER EFFECT
BARYONS
BASIC INTERACTIONS
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ELEMENTS
ENERGY LEVELS
EXCITED STATES
FERMIONS
FLUIDS
GASES
HADRONS
HELIUM
INTERACTIONS
LASER RADIATION
LIFETIME
MATTER
METASTABLE STATES
NONMETALS
NUCLEI
NUCLEONS
PARTICLE INTERACTIONS
RADIATIONS
RARE GASES
RESONANCE