Abstract
The momentum distribution of photons from positrons annihilating in liquid and solid cesium–ammonia solutions was found to be concentration dependent. The narrow component was found to broaden with increasing concentration. The results are compared with those obtained for pure cesium, and one is led to believe that a bound species is formed in these solutions even at very high concentrations. No evidence of a Mott transition is found in cesium–ammonia solutions, and no abrupt change is found in the shape of the momentum distribution in going from 22 to 94 mole % cesium in ammonia. A conduction-electron-type analysis is presented for the density of states and the probability density. Methods of preparing relatively stable cesium–ammonia solutions are discussed in some detail.
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