Narrow-Angle Beams of Strongly Interacting Phonons
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چکیده
We demonstrate that narrow-angle phonon pulses of low energy phonons in liquid 4 He are strongly interacting and rapidly come into equilibrium within a narrow cone in momentum space. The effect of collimation on such a system is to strongly reduce the axial phonon flux. This gives a method of separating high and low energy phonons.
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تاریخ انتشار 2001