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This nucleus has been observed in the ²⁴Mg(p, ⁶He)¹⁹Na reaction (1969CE01; E_p = 54.7 MeV) and in the ²⁴Mg(³He, ⁸Li)¹⁹Na reaction (1975BE38; E(³He) = 76.3 MeV). The latter experiment leads to an atomic mass excess of 12.928 ± 0.012 MeV for ¹⁹Na in its ground state. In addition, an excited state is observed at E_x = 120 ± 10 keV (1975BE38). Assuming the atomic mass excess listed above, ¹⁹Na(0) is unstable with respect to breakup into ¹⁸Ne + p by 320 ± 13 keV. See also (1972CE1A, 1976BE1L, 1976JA23), (1975BE31, 1977SH13; theor.) and (1972AJ02).