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Low-energy quasiparticle scattering, recombination, and branch-mixing lifetimes and phonon pair-breaking and scattering lifetimes are calculated for superconductors. The quasiparticle calculations relate these lifetimes to the low-frequency behavior of α²(Ω)F(Ω). Results are obtained using the low-frequency approximate form α²(Ω)F(Ω)=bΩ², with b determined from electron tunneling measurements. For the strong-coupling superconductors Pb and Hg, the full tunneling form for α²(Ω)F(Ω) is used. The phonon lifetimes are shown to depend on α²(Ω). Results are compared with experiment.
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Kaplan et al. (1976) studied this question.
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