Positronium Decay in Teflon. Influence of Lattice Transitions

Abstract
The decay of positronium in Teflon has been investigated at temperatures between -200 and +280°C and in greater detail in the region of lattice transitions around room temperature. It is found that the long life-time τ2 increases sharply in the interval between 20 and 50°C, while the probability of formation of positronium shows a drop around 20°C. Evidence of the reversibility of the lattice transitions results from the decay features of positronium.