Crossing the dripline to 11 N using elastic resonance scattering

The level structure of the unbound nucleus ${}^{11}\mathrm{N}$ has been studied by ${}^{10}\mathrm{C}+p$ elastic resonance scattering in inverse geometry with the LISE3 spectrometer at GANIL, using a ${}^{10}\mathrm{C}$ beam with an energy of 9.0 MeV/nucleon. An additional measurement was done at the A1200 spectrometer at MSU. The excitation function above the ${}^{10}\mathrm{C}+p$ threshold has been determined up to 5 MeV. A potential-model analysis revealed three resonance states at energies ${1.27}_{\ensuremath{-}0.05}^{+0.18}$ MeV $(\ensuremath{\Gamma}=1.44\ifmmode\pm\else\textpm\fi{}0.2$ MeV), ${2.01}_{\ensuremath{-}0.05}^{+0.15}$ MeV $(\ensuremath{\Gamma}=0.84\ifmmode\pm\else\textpm\fi{}0.2$ MeV), and $3.75\ifmmode\pm\else\textpm\fi{}0.05$ MeV $(\ensuremath{\Gamma}=0.60\ifmmode\pm\else\textpm\fi{}0.05$ MeV) with the spin-parity assignments ${I}^{\ensuremath{\pi}}={\frac{1}{2}}^{+},{\frac{1}{2}}^{\ensuremath{-}},{\frac{5}{2}}^{+},$ respectively. Hence, ${}^{11}\mathrm{N}$ is shown to have a ground state parity inversion completely analogous to its mirror partner ${}^{11}\mathrm{Be}.$ A narrow resonance in the excitation function at $4.33\ifmmode\pm\else\textpm\fi{}0.05$ MeV was also observed and assigned spin parity ${\frac{3}{2}}^{\ensuremath{-}}.$

Hali tarjima qilinmagan