Meeting on Beauty in Physics - Theory and Experiment in Honor of Francesco Lachello on the Occasion of his 70th Birthday, Meksika, 14 - 18 Mayıs 2012, cilt.1488, ss.156-161
The importance of the number of valence nucleons and its effect in nuclear binding to collective effects is discussed. In addition, a Si anomaly, an inconsistency between E(2(1)(+)) and S-2n, at N=20 is presented.