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VOLUME 21 (1975) | ISSUE 5 | PAGE 253
A new singularity in the dispersion of impurity excitation in superfluid helium
It is shown that the impurity branch of the energy spectrum of the elementary excitations of He3-He4 solutions has an end point at which decay into a roton and an He3 quasiparticle with small momentum takes place. The parameters of this spectrum are obtained.