The angular distribution of the energy density of an anisotropic “phonon sheet” was studied during its propagation in superfluid 4He at pulse duration up to 300 ns. The presence of a flat segment on the angular dependencies of phonon signal is explained by the formation of a “hot” area in the central region of the sheet and by the process of generation of high-energy phonons in this central region. The saturation of width of a flat section at pulse durations near 300 ns is explained by implementation of the long-pulsed beam propagation mode.
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