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- W2022339457 abstract "We have discovered a method for selectively detecting high-energy phonons which has enabled us to make detailed measurements of the shapes of high-energy phonon pulses in liquid ${}^{4}mathrm{He}$ at $ensuremath{approx}50mathrm{mK}.$ These phonons are created from pulses of low-energy phonons, injected into the helium by a heater. We suppress the detection of the low-energy phonons by orienting a thin film superconducting Zn bolometer at an angle to the phonon beam. We find that the high-energy phonons are created continuously along the propagation path. As there is also velocity dispersion, the signal at any time is due to a range of phonon energies. Computer simulations of the signals from short pulses reproduce the main features of the measured results. The behavior of the high-energy phonon signals as functions of heater power and pulse length are analyzed and this leads us to suggest how the low-energy phonon pulse develops. In the following paper [I. N. Adamenko et al., Phys. Rev. B 69, 144525 (2004)] the pulse shape for short pulses is derived analytically." @default.
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- W2022339457 date "2004-04-30" @default.
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- W2022339457 title "High-energy phonon pulses in liquid<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant=normal>He</mml:mi></mml:math>" @default.
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- W2022339457 doi "https://doi.org/10.1103/physrevb.69.144524" @default.
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