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20B (1998TI06)(Not observed) The mass excess of 20B is predicted to be 69.08 MeV (1974TH01). 20B is then unstable with respect to breakup into 19B + n by 0.9 MeV: see 19B in (1995TI07) and (1978AJ03, 1983ANZQ) and see the work on effective interactions for the (0p1s0d) nuclear shell-model space (1992WA22).
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