L=1Excitation in the Halo Nucleus11Li

Collisions of ${}^{11}\mathrm{Li}+p$ at $68A\mathrm{MeV}$ have been studied by correlational measurements. An excited state of ${}^{11}\mathrm{Li}$ at $E^{*}\simeq 1.3\mathrm{MeV}$ was observed. The measured angular distributions show the dipole nature of the excitation of the 1.3-MeV peak. The structure of the excited states and the ground state of ${}^{11}\mathrm{Li}$ is discussed.