The measurements on the spatial distribution of phonons emitted from a tunnel-injected nonequilibrium superconductor using a phonon transmission technique are reported. The injector junction emitting nonequilibrium phonons is an in-line-type Sn-I-Sn junction almost free from the geometrical effect of current flow. The phonon sensor is either a small tin or lead junction. The periodically modulated structure with the period about 100 {μ}m is found, which is profoundly enhanced in case that a lead sensor is used. The nature of the transmitted excitations through liquid helium is also investigated.
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Iguchi et al. (1983) studied this question.
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