S. De Baerdemacker

Solution of the Bohr Hamiltonian for soft triaxial nuclei

The Bohr-Mottelson model is solved for a generic soft triaxial nucleus, separating the Bohr Hamiltonian exactly and using a number of different model potentials: a displaced harmonic oscillator in \ensuremath{\gamma}, which is solved with an approximated algebraic technique; and Coulomb/Kratzer, harmonic/Davidson, and infinite square-well potentials in \ensuremath{\beta}, which are solved exactly. In each case we derive analytic expressions for the eigenenergies, which are then used to calculate energy spectra. Here we study the chain of osmium isotopes and compare our results with experimental information and previous calculations.

Quadrupole collective variables in the natural Cartan–Weyl basis

The matrix elements of the quadrupole collective variables, emerging from collective nuclear models, are calculated in the natural Cartan–Weyl basis of O(5) which is a subgroup of a covering SU(1, 1) × O(5) structure. Making use of an intermediate set method, explicit expressions of the matrix elements are obtained in a pure algebraic way, fixing the γ-rotational structure of collective quadrupole models.

A theoretical description of energy spectra and two-neutron separation energies for neutron-rich zirconium isotopes

Abstract.Very recently the atomic masses of neutron-rich Zr isotopes, from 96Zr to 104Zr, have been measured with high precision. Using a schematic Interacting Boson Model (IBM) Hamiltonian, the evolution from spherical to deformed shapes along the chain of Zr isotopes, describing at the same time the excitation energies as well as the two-neutron separation energies, can be rather well reproduced. The interplay between phase transitions and configuration mixing of intruder excitations in this mass region is succinctly addressed.

Configuration mixing in 188Pb: Band structure and electromagnetic properties

In the present paper, we carry out a detailed analysis of the presence and mixing of various families of collective bands in

Configuration mixing in the neutron-deficient 186-196Pb isotopes

^{188}\mathrm{Pb}

The quadrupole collective model from a Cartan–Weyl perspective

. Making use of the interacting boson model, we construct a particular intermediate basis that can be associated with the unperturbed bands used in more phenomenological studies. We use the

Probing pairing correlations in Sn isotopes using Richardson-Gaudin integrability

E2

Spectral properties of a tractable collective Hamiltonian

decay to construct a set of collective bands and discuss in detail the

Soft triaxial rotor in the vicinity of γ = π/6 and its extensions

(\mathrm{BE}2)

Collective Structures Within the Cartan‐Weyl Based Geometrical Model

values. Monopole transition