Abstract
The second-rank analyzing powers ${T}_{20}$ and ${}^{T}{T}_{20}$ were measured using a tensor-polarized beam of ${}^{23}\mathrm{Na}$ scattered from ${}^{27}\mathrm{Al}$ at an incident energy of 150 MeV. The concept of tidal symmetry in scattering systems leads directly to a shape-effect relationship between the two sets of analyzing powers which should hold good at low values of the isocentrifugal parameter and this has been confirmed in other scattering systems. $\mathrm{For}{ }^{23}\mathrm{Na}{+}^{27}\mathrm{Al}$ at 150 MeV the isocentrifugal parameter has the low value of 0.04, yet the shape effect relations do not hold true for the data forward of $12\ifmmode^\circ\else\textdegree\fi{} \mathrm{c}.\mathrm{m}.$ It is suggested that this may be evidence for an effect of the deformation of the target nucleus and this is supported by coupled-channel calculations which agree well with the data.
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