Ortho-Positronium in Alkanes under High Pressure
T. Goworek and B. Zgardzińska
Lublin Positron Group, UMCS, pl. Marii Curie-Skłodowskiej 1, 20-031 Lublin, Poland
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Received: 3 09 2007;
Phase transitions in n-alkanes were observed by using the positron annihilation lifetime method. In the case of alkanes, application of pressure is equivalent to temperature lowering (1 K corresponds to≈4 MPa). When argon at high pressure penetrates the sample one observes a non-monotonous dependence of the melting point on pressure. This effect is observed also in even-numbered alkanes, in which there is no rotator phase.
DOI: 10.12693/APhysPolA.113.1379
PACS numbers: 36.10.Dr, 61.80.Fe, 71.60.+z, 78.70.Bj