Phase transitions in the sdg interacting boson model

被引：26

作者：

Van Isacker, P. ^{[1
]}

Bouldjedri, A. ^{[2
]}

Zerguine, S. ^{[2
]}

机构：

[1] CEA DSM CNRS IN2P3, Grand Accelerateur Natl Ions Lourds, F-14076 Caen 5, France

[2] Univ Batna, Dept Phys, PRIMALAB Lab, Batna 05000, Algeria

来源：

NUCLEAR PHYSICS A | 2010年 / 836卷 / 3-4期

关键词：

Interacting boson model; Phase transitions; Hexadecapole deformation; NUCLEAR COLLECTIVE MODELS; QUASI-DYNAMIC SYMMETRY; CLASSICAL LIMIT; STATES; SHAPES; SYSTEMS; REGION; U(5); IBM;

D O I：

10.1016/j.nuclphysa.2010.01.247

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：

A geometric analysis of the sdg interacting boson model is performed. A coherent state is used in terms of three types of deformation: axial quadrupole (beta(2)), axial hexadecapole (beta(4)) and triaxial (gamma(2)). The phase-transitional structure is established for a schematic sdg Hamiltonian which is intermediate between four dynamical symmetries of U(15), namely the spherical U(5) circle times U(9), the (prolate and oblate) deformed SU(+/-) (3) and the gamma(2)-soft SO(15) limits. For realistic choices of the Hamiltonian parameters the resulting phase diagram has properties close to what is obtained in the sd version of the model and, in particular, no transition towards a stable triaxial shape is found. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：225 / 241

页数：17

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