Abstract
The time for positron thermalization in ionic crystals due to the interaction of positronic atoms with polarizational optical oscillations of the lattice is calculated. The positronic atom is considered as a dipole with moment p induced by the internal crystal field. The dipole moment is evaluated from the value of the positronic-atom deformation parameter determined from data on the magnetic quenching of positronium. For an NaCl crystal, p ≈ 1.91D. The positronium thermalization time in ionic, crystals (for the example of NaCl) is estimated at ∼10−1 sec. After this time, not only ortho positronium but also para positronium reached total thermalization.
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