CERN-PS-205()
LASER SPECTROSCOPY OF ANTIPROTONIC HELIUM ATOMS
()
- Proposed: Jan, 1991,
- Approved: Apr 4, 1991,
- Started: Sep, 1991,
- Still Running
PS205 Collaboration
Studies the exotic atom trapping of antiproton by measuring the delayed annihilation time spectrum. The long-lived pbar trapping in liquid helium was first observed by KEK-215 collaboration. The experiment aims to study this effect in great detail using the improved beam intensity and emittance available at LEAR. The first phase of the program included investigations of trapping in solid, liquid, and gaseous phases of He3 and He4. In 1993, a new technique of forced annihilation of antiprotons was introduced. A high-power dye laser pulse is used to stimulate resonant transitions between metastable and short-lived pairs of states differing by one unit of l. The laser spectroscopy is used to clarify the formation, structure, and dynamics of the metastable antiprotonic helium atoms. A new laser - microwave double resonance technique is planned for 1996. Taking data (June 96).
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