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The use of a double tunnel junction to investigate the nonequilibrium quasiparticle distribution due to tunnel injection has been studied. I give quantitative explanations of the sharp structures and the asymmetric effects observed by Kaplan, Kirtley, and Langenberg in the second derivative of the $I(V)$ characteristics of the driven detector junction. It is suggested that the energy- and temperature-dependent inelastic quasiparticle relaxation time, as well as the elastic-scattering branch-mixing time, can be extracted from these sharp structures and the asymmetric effects.
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Jhy-Juin Chang (1977) studied this question.
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