Further Possibilities for Measurements on the p̄p-System Using the Cyclotron Trap
The cyclotron trap discussed earlier at this workshop1) is considered to offer an excellent means for the measurement of antiprotonic K-X-rays in hydrogen isotopes. Although it was originally designed to work with pressures as low as several Torr, thus eliminating all disturbing effects on the cascade (collisional Stark effect, chemical dissocitation, Coulomb deexcitation), subsequent studies have indicated that pressures as low as 10-3 Torr can be used. In this case, the p̄p-system can be considered as having been formed in vacuum. This results in a handy prepared system from which decay products can be studied. More than 90% of all antiprotons will reach the 2p-level, which serves then as a definite initial level for all succeeding processes such as annihilation processes or transitions to bound states of Nuclear type (Baryonium, Glue balls). In the following it will be shown that working with low pressure hydrogen gas in any case facilitates the experiments and enables us to perform new kinds of measurements which are not feasible with collision-disturbed high pressure p̄p-systems.
KeywordsAtomic State Hydrogen Isotope Nuclear State Annihilation Cross Section Annihilation Reaction
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