Experiments on magnetic quenching of positronium have been carried out in water and the results obtained by two different techniques are compared. The results were not found to agree with theoretical predictions, the starting assumption being that positronium annihilates by "pick-off'' as a free atom. Some considerations are made about the anomalous features of magnetic quenching of positronium in water.
The decay of positrons has been investigated in the halogen derivatives of benzene, both at room temperature and at -100°C, and in a number of halogen compounds. A lifetime of the order of 4X 10~~1 0 sec is found in all the investigated compounds but fluorobenzene, and suggests the presence of a positron-halogen bound state; a search for the excited levels of such a bound state, whose decay features were predicted by Goldansky and co-workers, was inconclusive.
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