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We have measured the quasiparticle recombination time in the strong-coupled superconductor Pb₀. ₉Bi₀. ₁ directly by measuring the lifetime-broadened energy gap edge. This is done by measuring the I-V characteristics of a superconducting tunnel junction of the type Pb₀. ₉Bi₀. ₁-insulator-Pb₀. ₉Bi₀. ₁. Agreement with the calculated value is excellent.
Dynes et al. (1978) studied this question.