Information on mass chains and nuclides available on this website:

WWW TUNL

The ¹⁴N(³He, ⁶He)¹¹N reaction has been studied at E(³He) = 70 MeV. A ⁶He group is observed which corresponds to a state in ¹¹N with an atomic mass excess of 25.23 ± 0.10 MeV and Γ = 740 ± 100 keV. The cross section for forming this state is 0.5 μb/sr at 10°. The observed state is interpreted as being the J^π = 1/2^- mirror of ¹¹Be*(0.32) because of its width; the 1/2⁺ mirror ¹¹Be_g.s. would be expected to be much broader (74BE20). This ¹¹N state is unbound with respect to decay into ¹⁰C + p by 2.24 MeV. (88WA18) adopt an atomic mass excess of 24.89 ± 0.14 MeV for ¹¹N_g.s. [This value assumes that the first excited state in ¹¹N is at E_x = 0.34 MeV.] We suggest an uncertainty of ± 0.2 MeV because the E_x of the first excited state in ¹¹N may be depressed relative to ¹¹Be*. The ground state is then unstable with respect to ¹⁰C + p by 1.90 MeV. See also (85AN28, 86AN07; theor.).