https://doi.org/10.1140/epjd/e20020046
Quenching of metastable antiprotonic helium atoms in collisions with deuterium molecules
1
Institute of Nuclear Research of the Hungarian
Academy of Sciences, 4001 Debrecen, Hungary
2
CERN, 1211 Geneva 23, Switzerland
3
Department of Physics, University of Tokyo,
7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan
4
KFKI Research Institute for Particle and Nuclear Physics,
1525 Budapest, Hungary
5
Institute of Physics, University of Tokyo,
3-8-1 Komaba, Meguro-ku, Tokyo 153, Japan
6
RI Beam Science Laboratory, RIKEN, Wako, Saitama 351-0198, Japan
Corresponding author: a bertalan.juhasz@cern.ch
Received:
6
July
2001
Published online: 15 March 2002
Quenching of metastable antiprotonic helium atoms in collisions with deuterium molecules has been studied using laser spectroscopy at CERN's new Antiproton Decelerator facility. The quenching cross-sections of the states (n,l) = (39, 36), (39, 37), and (39, 38) were determined from the decay rates of the states which were observed using the “deuterium-assisted inverse resonance” (DAIR) method. The results revealed a similar (n,l)-dependence of the quenching cross-sections as in the case of hydrogen but the values were smaller by a factor of ~1.5.
PACS: 36.10.-k – Exotic atoms and molecules (containing mesons, muons, and other unusual particles) / 42.62.Fi – Laser spectroscopy / 34.20.Gj – Intermolecular and atom-molecule potentials and forces
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2002
