γ -ray spectroscopy of C 19 via the single-neutron knock-out reaction

The one-neutron knock-out reaction $^{1}\mathrm{H}(^{20}\mathrm{C},^{19}\mathrm{C}\ensuremath{\gamma})$ was studied at RIKEN using the DALI2 array. A $\ensuremath{\gamma}$-ray transition was observed at 198(10) keV. Based on the comparison between the experimental production cross section and theoretical predictions, the transition was assigned to the de-excitation of the $3/{2}_{1}^{+}$ state to the ground state.