Abstract
The first observation of Alpher-Rubin attenuation of surface acoustic waves is reported. The surface waves were propagated on an ST-cut quartz substrate, and absorption occurred in a 10-\ensuremath{\mu}m tantalum film due to the surface-wave-driven oscillation of conduction electrons in an external 24-kG magnetic field. A scaling law is derived that relates attenuation coefficients of bulk and surface waves. Unsuccessful searches were made for nuclear acoustic resonance (NAR) of surface waves due to electric quadrupole transitions of $^{181}\mathrm{Ta}$ and magnetic dipole transitions of $^{1}\mathrm{H}$. Theoretical estimates of the attenuation of surface waves agree with the observed Alpher-Rubin effect and indicate that the NAR signal was less than the noise.
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