Information on mass chains and nuclides

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²⁰Mg has not been observed [see, however, (1964MA44)]. The mass excess of ²⁰Mg is calculated to be 17.509 ± 0.002 MeV (using the senority scheme) and 17.510 ± 0.002 MeV (using the supermultiplet scheme). ²⁰Mg would then be stable with respect to breakup into ¹⁹Na + p by 2.75 MeV (1969HA38). See also (1962GO31, 1964GA1C, 1964GO1G, 1966GO1B, 1966GO1K, 1966KE16).