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Nonpolar optical scattering of positronium in magnesium fluoride

Abstract : We report the results of the analysis of the temperature broadening of the momentum distribution of delocalized Positronium (Ps) in Magnesium Fluoride in terms of optical deformation-potential scattering model (long-wavelength optical phonons).~The Ps optical deformation-potential coupling constant $D_{o}$ in MgF$_{2}$ has been determined to be $(1.8\pm0.3)\times10^{9}$~eV/cm.~We also show that the Ps momentum distribution is sensitive to second-order phase transitions in those crystals where optical deformation-potential scattering is allowed in one and forbidden in another crystalline phase.
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http://hal.in2p3.fr/in2p3-00023323
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Submitted on : Tuesday, November 23, 2004 - 3:22:49 PM
Last modification on : Friday, November 6, 2020 - 3:29:23 AM
Long-term archiving on: : Monday, September 10, 2012 - 6:20:10 PM

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I.V. Bondarev, Y. Nagai, M. Kakimoto, T. Hyodo. Nonpolar optical scattering of positronium in magnesium fluoride. 2004. ⟨in2p3-00023323⟩

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