Attenuation of Zero Sound and the Low-Temperature Transitions in LiquidHe3

Peaks have been observed in the attenuation of zero sound at the "$A$" and "$B$" transitions below 3 mK in liquid ${}_{}{}^3{}_{}{}^{}\mathrm{He}$. In a magnetic field the $A$ transition splits, exhibiting two narrow attenuation peaks. The attenuation peak at the $B$ transition seems to result from scattering localized at the interface between the two liquid phases.