The frequency of the protonium annihilation channel pbar-p --> KSKL has been measured at three different target densities: liquid hydrogen (LH) , gaseous hydrogen at NTP conditions and gaseous hydrogen at low pressure (5 mbar) . The obtained results are: f(LH) = (7.8 +-0.7stat +-0.3syst) x 10e4, f(NTP) = (3.5+-0.5stat+-0.2syst) x 10e4 and f(5 mbar) = (l.0+-0.3stat+-0.1syst) x 10e4. Since the KSKL final state can be originated only from the 3S1 initial state, these values give direct information on the scaling of the protonium spin-triplet S-wave annihilation probability with the density.
Protonium annihilation into K(S)K(L) at three different target densities.
FONTANA, ANDREA;MONTAGNA, PAOLO MARIA;ROTONDI, ALBERTO;
1996-01-01
Abstract
The frequency of the protonium annihilation channel pbar-p --> KSKL has been measured at three different target densities: liquid hydrogen (LH) , gaseous hydrogen at NTP conditions and gaseous hydrogen at low pressure (5 mbar) . The obtained results are: f(LH) = (7.8 +-0.7stat +-0.3syst) x 10e4, f(NTP) = (3.5+-0.5stat+-0.2syst) x 10e4 and f(5 mbar) = (l.0+-0.3stat+-0.1syst) x 10e4. Since the KSKL final state can be originated only from the 3S1 initial state, these values give direct information on the scaling of the protonium spin-triplet S-wave annihilation probability with the density.File in questo prodotto:
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