Abstract
The elastic scattering of ${}^{9}\mathrm{Li}{+}^{12}\mathrm{C}$ and ${}^{11}\mathrm{Li}{+}^{12}\mathrm{C}$ has been measured at an incident energy of 50 MeV per nucleon over the angular range from 2\ifmmode^\circ\else\textdegree\fi{} to 15\ifmmode^\circ\else\textdegree\fi{} in the center-of-momentum frame. The elastic and inelastic reaction channels were cleanly separated in the critical forward-angle region where a predicted nearside/far-side interference minimum should be observed. The angular distributions obtained in this experiment are consistent with existing quasielastic measurements at 60 MeV per nucleon. In particular, the ${}^{9}\mathrm{Li}$ data display the interference minimum, while it is absent for ${}^{11}\mathrm{Li}.$ This difference is shown to occur in the elastic channel, and the results are discussed in terms of strongly enhanced surface refraction in the ${}^{11}\mathrm{Li}$ case.
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