These new developments are contrary to the assumption made in the semiempirical shellmodel mass equation (SSME) [12] (see also ref. [13]) that Z = 114 is the next proton magic number beyond lead. The equation stops at Z = 114, and it is unsuitable for extrapolation already earlier, beyond Hs (Z = 108), as shown by its increasing deviations from the data beyond that (like in fig. 4 of ref. [1]). One has to find an appropriate substitute for the equation in the neighbourhood of Z = 114 and beyond.During the early stages of the SSME [14], when it was adjusted separately in individual shell regions in the N − Z plane, both Z = 114 and Z = 126, which were at the time considered possible candidates for the post-lead proton magic number, were tried as a shell region boundary in each of the two heaviest regions with Z ≥ 82 and respective N boundaries 82 ≤ N ≤ 126 (called here region A) and 126 ≤ N ≤184 (called region B).
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