New Giant Dipole Strength inLi6andLi7as Revealed via (n,p) at 60 MeV

The ($n$, $p$) reaction in ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$ and ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$ at 60 MeV reveals large structures at high excitations which are the analogs of states in ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$ and ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$ at 29 and 31 MeV, respectively. These new structures, which exhibit giant dipole strength, are not seen in photoneutron data. They do not appear to contain appreciable dipole spin-mode strength. The exhaust large sumrule fractions, and largely answer the longstanding question of missing giant dipole resonance strength in these nuclei.