  The zero sound attenuation of normal liquid 3He has been studied over a range
of temperatures from slightly above the superfluid transition temperature, Tc,
to approximately 10 mK at the constant pressures of 1 bar and 5 bar. Using
longitudinal LiNbO3 transducers, operating both on and off resonance, the
experiment was performed at 15 discrete frequencies located in several
broadband frequency windows, including 16 - 25 MHz, 60 - 70 MHz, and 105 - 111
MHz. The results are compared to Landau's prediction for the attenuation of
zero sound in the quantum limit, k_{B}T << \hbar \omega << k_{B}T_{F}, where
\alpha_{0}(P,T,\omega) = \alpha^{\prime}(P) T^{2} {1+(\hbar \omega/2 \pi
k_{B}T)^{2}}. Calibration of the received zero sound signals was performed by
measuring the temperature dependence of the first sound attenuation from 30 mK
to 800 mK at those same frequencies and pressures. The data are compared to
previous results.
