Conveners
Session XVII (Parallel Session)
- Daniele Mengoni
The nuclear shapes and collective excitations have been one of the most prominent and studied themes of nuclear structure physics. Experiments using radioactive-ion beams allow to study thus far unknown nuclei and also necessitate timely systematic, as well as reliable, theoretical analyses. The interacting boson model (IBM) has been remarkably successful in phenomenological description of...
The Zr isotopes (Z=40) belong to a mass region where shape coexistence has been proposed. These isotopes exhibit a variety of shapes, going from deformation near mid-open-shell (80Zr), through sphericity near the closed neutron shell (90Zr) and sub-shell (96Zr), and then to a sudden reappearance of deformation at 100Zr.
Such a variety of behavior is unprecedented anywhere on the nuclide chart....
The shape of a nucleus is one of its fundamental properties. The nuclei in the neutron-rich region around mass 100 are well known to exhibit rapid shape changes. The simplest estimate of nuclear deformation in even-even nuclei can be obtained from the energy of the 2+1 state. For Sr (Z = 38) and Zr (Z = 40) isotopes this energy is observed to decrease dramatically at N = 60, while its...
The Zirconium isotopes across the N=56,58 neutron sub-shell closures have been of special interest since years, sparked by the near doubly-magic features of $^{96}$Zr and the subsequent rapid onset of collectivity with a deformed ground-state structure already in $^{100}$Zr. Recent state-of-the-art model approaches [1] did not only correctly describe this shape phase transition in the Zr...
