Tensor analyzing powers for Li7 breakup

Differential cross sections and ${\mathit{T}}_{20}$ and $_{20}^{\mathit{TT}}$ analyzing powers have been measured for 70 MeV $^{7}\mathrm{Li}$ breakup into the \ensuremath{\alpha} particle plus triton channel, on a $^{120}\mathrm{Sn}$ target. Measurements were made for both continuum breakup and sequential breakup via the 4.63 MeV state in $^{7}\mathrm{Li}$. The ${\mathit{T}}_{20}$ data for the continuum breakup do not agree with a semiclassical Coulomb model, indicating that the breakup at small angles does not proceed solely via a Coulomb force. The data generally show a somewhat better agreement with continuum discretized coupled channels calculations, indicating the importance of the nuclear force and channel coupling in the reaction mechanism.