G. Consolati et F. Quasso, QUASI-POSITRONIUM IN POLYETHYLENE TEREPHTHALATE - TEMPERATURE AND MAGNETIC QUENCHING EFFECTS, Acta Physica Polonica. A, 83(3), 1993, pp. 273-276
The features of the positron-electron bound system (quasi-positronium,
qPs) in the semicrystalline polymer polyethylene terephthalate (mylar
) are obtained while studying the dependence of the ortho-qPs lifetime
on temperature in the range of 25-105-degrees-C, in the presence as w
ell as in the absence of magnetic fields. In particular, the 'anomalou
s' effect, previously discovered by Bisi et al. at room temperature, i
s maintained at higher temperature.