Abstract
Positron lifetime spectra were measured in solid and liquid phases of 2-norbornylene. No accumulation of excess electrons in the brittle phase was observed. The vacancy activation enthalpy in plastic phase was found equal (0.13±0.02)eV. The temperature dependence of positronium lifetime in the bulk deviates from expectations of two-state model; it can be explained by an assumption that some of positronium atoms are created directly in vacancies (not transferred from the bulk). The macroscopic surface tension of liquid norbornylene at 330K is estimated as (23.1–26.6)mN/m.
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