Shape phase transitions and critical points

被引:0
|
作者
Alonso, C. E. [1 ]
Arias, J. M. [1 ]
Fortunato, L. [2 ]
Vitturi, A. [2 ]
机构
[1] Univ Seville, Fac Fis, Dept Fis Atom Mol & Nucl, Apartado 1065, E-41080 Seville, Spain
[2] Ist Nazl Fis Nucl, Dipartimento Fisica Galileo Galilei, I-35131 Padua, Italy
来源
PERSPECTIVES IN NUCLEAR PHYSICS | 2009年 / 1120卷
关键词
Shape phase transition; Interacting Boson Fermion Model; Critical point symmetries; NUCLEAR COLLECTIVE MODELS; QUASI-DYNAMIC SYMMETRY; BOHR MODEL; IBM; U(5);
D O I
暂无
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
We investigate different aspects connected with shape phase transitions in nuclei and the possible occurrence of dynamical symmetries at the critical points. We discuss in particular the behaviour of the neighbour odd nuclei at the vicinity of the critical points in the even nuclei. We consider both the case of the transition from the vibrational behaviour to the gamma-unstable deformation (characterized within the collective Bohr hamiltonian by the E(5) critical point symmetry) and the case of the transition from the vibrational behaviour to the stable axial deformation (characterized by the X(5) symmetry). The odd particle is assumed to be moving in the three single particle orbitals j=1/2,3/2,5/2, a set of orbitals that is known to lead to possible supersymmetric cases. The coupling of the odd particle to the Bohr hamiltonian does lead in fact in the former case at the critical point to the E(5/12) boson-fermion dynamical symmetry. An alternative approach to the two shape transitions is based on the Interacting Boson Fermion Model. In this case suitably parametrized boson-fermion hamiltonians can describe the evolution of the odd system along the shape transitions. At the critical points both energy spectra and electromagnetic transitions were found to display characteristic patterns similar to those displayed by the even nuclei at the corresponding critical point. The behaviour of the odd nuclei can therefore be seen as necessary complementary signatures of the occurrence of the phase transitions.
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收藏
页码:64 / +
页数:2
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