The one neutron knock-out reaction $^1$H($^{20}$C,$^{19}$C$gamma$) was studied at RIKEN using the DALI2 array. A $gamma$ ray transition was observed at 198(10) keV. Based on the comparison between the experimental production cross section and theoret
ical predictions, the transition was assigned to the decay of the 3/2$_1^+$ state to the ground state.
The structure of neutron rich nitrogen nuclei has been studied by use of neutron removal reaction and inelastic scattering. Mass and charge deformations have been deduced for the first excited state of 21N, which indicates the partial persitence of t
he N=14 subshell closure in nitrogen isotopes. The spectroscopic information obtained on the structure of 19,20,21N confirms the results from a previous experiment.
