Spectroscopy Of Neutron-Rich Nitrogen Isotopes With Agata Plus Paris Plus Vamos

Excited states of N-17, N-18 and N-19 were investigated through the measurement of gamma rays, following their population via deep-inelastic reactions induced by an O-18 beam (7 MeV/u) on a thick Ta-181 target. The experimental setup comprised the AGATA+PARIS detection system, coupled to the VAMOS++ magnetic spectrometer. In the N-17 nucleus, the analysis of gamma-ray transitions de-exciting two states around 4-5 MeV clearly pointed to discrepancies with the lifetime values reported in literature. Three new gamma rays were observed in N-18 at the energies of 1662.3 (3) keV, 2073.4 (8) keV and 2300.9 (8) keV, and hints for other two new transitions around 1566 keV and 1720 keV were found. In addition, a new transition with energy of 2489.7 (8) keV was observed in N-19.