R FCasten, PRC33, 1819(1986) E 68 往(2: 5658606264666870 2 FIG. L. Traditional and N,N, plots for E + for the rare-earth region, based on Ref. l. As discussed there a proton shell Z= 50-64 has been used for N <90, and Z=50-82 for NE90. The N,N, values for some typical unstudied nuclei are indicated in the figure. IThe first results for 4Ba have now become available (Ref. 2) 331819 @1986 The American Physical SocietyR.F.Casten, PRC33, 1819 (1986)