Resolution of New Structure in the Collective-Mode Spectrum ofHe3-B

A high-resolution acoustic impedance technique has been used to investigate the real squashing, $J=2\mathrm{}$, mode in ${}_{}{}^3{}_{}{}^{}\mathrm{He}$-$B$. For a magnetic field perpendicular to the sound propagation direction, six components have been observed. The two center states appear to be a splitting of the $J_z=0\mathrm{}$ mode. This new splitting is observed to be dependent on $\frac{T}{T_c}$, pressure, and/or frequency, but is independent of magnetic field. In $H\cong 0$, additional features have been observed which can be associated with dispersion-induced mode splitting.