ABSTRACT
The interacting boson model introduced in Section 33 has been described from the point of view of the collective model of the nucleus. The 5 components of a d-boson have been related to the 5 degrees of freedom of a shape, with constant volume, which may have quadrupole deformations. The s-boson has been added to simplify the construction of eigenstates which belong to irreducible representations of the U(6) group, the fully symmetric ones being characterized by an integer N. We saw how simple Hamiltonians including single boson energies and boson boson interactions give very good description of various kinds of collective motion.
