Abstract
All-neutral data have been taken with the Crystal Barrel Detector at LEAR/CERN providing high-statistics data samples of protonium annihilation in gaseous hydrogen at 12 atmospheres. The six-photon final state has been selected in order to yield data sets on π 0 π 0 π 0 η , π 0 π 0 η and π 0 ηη comparable in statistics to data of antiproton annihilation in liquid hydrogen from former run periods. Production of scalar resonances is favoured in liquid hydrogen where annihilation from initial S-state dominates. In gaseous hydrogen a larger amount of initial P-state annihilation contributes to the final states. Data are presented and preliminary results of partial wave analyses and the ratio of S- versus P-state annihilation rates are given.
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