Observation of the particle-unstable nucleus N-10

For the first time evidence of the ground state of the proton-rich, unbound nucleus ${}^{10}\mathrm{N}$ has been found in the multinucleon transfer reaction ${}^{10}\mathrm{B}{(}^{14}\mathrm{N}{,}^{14}\mathrm{B}{)}^{10}\mathrm{N}.$ The observed resonance of ${}^{10}\mathrm{N}$ has a mass excess of 38.8(4) MeV and a width of $\ensuremath{\Gamma}=2.3(16) \mathrm{MeV},$ close to the Audi-Wapstra estimation of 38.5(4) MeV. ${}^{10}\mathrm{N}$ is the last missing $A=10$ multiplet partner.