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20Mg (1972AJ02)(Not illustrated)
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).
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