N. Benhamouda, M. R. Oudih, N. H. Allal, M. Fellah
The two-neutron separation energy and the mean square charge radii of the neutron-deficient Yb isotopes are calculated in the framework of a microscopic model. The pairing correlations are included using the FBCS projection method.
Symmetry played a central role in the works of E.P. Wigner. He made a great contribution to the extension and reinterpretation of the concept of symmetry. He proposed a new classification. The paper investigates in the light of Wigner’s works how do we see now the classification of physical symmetries.