Localisation of ortho-positronium in argon

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Positronium lifetime measurements in argon are reported for the temperature range from 120K to room temperature and at pressures up to 220 bar. The results indicate the formation of a distinct bubble in the liquid phase and a more diffuse bubble in the gas phase. While at higher densities the experimental results can be rather well reproduced in terms of the density functional theory, at lower densities, below the theoretical bubble formation threshold, spontaneous density fluctuations in the fluid seem to explain the observed behaviour. Depending on the model for the free positronium energy in a homogeneous fluid, the Ps-Ar scattering length has a value between 0.5 and 0.8 AA.

Yksityiskohdat

AlkuperäiskieliEnglanti
Artikkeli016
Sivut2667-2681
Sivumäärä15
JulkaisuJournal of Physics B: Atomic, Molecular and Optical Physics
Vuosikerta19
Numero17
TilaJulkaistu - 1986
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

ID: 6599834