Abstract
The neutron-unbound ground state and two excited states of $^{12}\mathrm{Li}$ were formed by the two-proton removal reaction from a 53.4-MeV$/$u $^{14}\mathrm{B}$ beam. The decay energy spectrum of $^{12}\mathrm{Li}$ was measured with the Modular Neutron Array (MoNA) and the Sweeper dipole superconducting magnet at the National Superconducting Cyclotron Laboratory. Two excited states at resonance energies of 250 $\ifmmode\pm\else\textpm\fi{}$ 20 keV and 555 $\ifmmode\pm\else\textpm\fi{}$ 20 keV were observed for the first time and the data are consistent with the previously reported $s$-wave ground state with a scattering length of ${a}_{s}=\ensuremath{-}13.7$ fm.
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