The IBA-1 is reviewed with particular emphasis on the symmetry structure that arises
naturally from its inherently algebraic approach. The formulation of the model, in both its …

Recently, the idea of quantum phase transitions has been applied to equilibrium shape
changes in finite atomic nuclei. An introduction to and discussion of this concept, both from …

The interacting boson model was introduced in 1974 as an attempt to describe collective
properties of nuclei in a unified way. Since 1974, the model has been the subject of many …

The predictions of the interacting boson approximation are studied in the consistent Q
formalism in which the same parametrization of the boson quadrupole operator is used in …

Measurements of E2/M1 and E0/E2 multipole mixing ratios of transitions in even-even nuclei
have long provided important tests of nuclear models. The experimental data for transitions …

Partial decay schemes for the very neutron-rich nuclei 108,110,112 Ru and 114Ru, about
which nothing was previously known, have been determined from the study of prompt, triple …

The interacting boson approximation has been used to calculate the positive parity states of
Er 168 below 2 MeV. A simple parametrization has been used which corresponds to a …

The time-dependent Hartree-Bogolyubov treatment of the pairing-plus-quadrupole model,
employed previously for the energy levels and the electromagnetic moments of W, Os and Pt …

Excited states of 156 Dy were populated through β+/ɛ decay and studied through γ-ray
spectroscopy at the Yale Moving Tape Collector. Extensive data led to improved information …

In order to obtain a more complete description of the low-lying collective states of even-even
nuclei, we present an extended version of the interacting boson model. Besides s-and d …