633 research outputs found
Quantum Shape-Phase Transitions in Finite Nuclei
Quantum shape-phase transitions in finite nuclei are considered in the
framework of the interacting boson model. Critical-point Hamiltonians for
first- and second-order transitions are identified by resolving them into
intrinsic and collective parts. Suitable wave functions and finite-N estimates
for observables at the critical-points are derived.Comment: 6 pages, 2 figures, Proc. 2nd Int. Conf. on "Collective Motion in
Nuclei under Extreme Conditions" (COMEX 2), June 20-23, 2006, Sankt Goar,
German
Partial Dynamical Symmetry as an Intermediate Symmetry Structure
We introduce the notion of a partial dynamical symmetry for which a
prescribed symmetry is neither exact nor completely broken. We survey the
different types of partial dynamical symmetries and present empirical examples
in each category.Comment: 10 pages, 5 figures, Proc. Int. Conf. on "Symmetry in Physics", March
23-30, 2003, Erice Ital
Deformed Pseudospin Doublets as a Fingerprint of a Relativistic Supersymmetry in Nuclei
The single-particle spectrum of deformed shell-model states in nuclei, is
shown to exhibit a supersymmetric pattern. The latter involves deformed
pseudospin doublets and intruder levels. The underlying supersymmetry is
associated with the relativistic pseudospin symmetry of the nuclear mean-field
Dirac Hamiltonian with scalar and vector potentials.Comment: 6 pages, 3 figures, Proc. 10th Int. Spring Seminar on Nuclear
Physics, "New Quests in Nuclear Structure", Vietri Sul Mare, Italy, May
21-25, 201
Partial Dynamical Symmetries in Nuclei
Partial dynamical symmetries (PDS) are shown to be relevant to the
interpretation of the band and to the occurrence of F-spin multiplets
of ground and scissors bands in deformed nuclei. Hamiltonians with bosonic and
fermionic PDS are presented.Comment: 6 pages, 2 figures, Proc. Int. Conf. "Bologna 2000 - Structure of the
Nucleus at the Dawn of the Century", Bologna, Italy, May 29 - June 3, 200
Relativistic Pseudospin Symmetry as a Supersymmetric Pattern in Nuclei
Shell-model states involving several pseudospin doublets and ``intruder''
levels in nuclei, are combined into larger multiplets. The corresponding
single-particle spectrum exhibits a supersymmetric pattern whose origin can be
traced to the relativistic pseudospin symmetry of a nuclear mean-field Dirac
Hamiltonian with scalar and vector potentials.Comment: 8 pages, 4 figures, Proc. 8th Int. Spring Seminar on Nuclear
Physics,``Key Topics in Nuclear Structure'', Paestum, Italy, May 23-27, 200
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