Microscopic analysis of spherical to γ-soft shape transitions in Zn isotopes  

作　　者：VRETENAR Dario 

机构地区：[1]Physics Department,Faculty of Science,University of Zagreb

出　　处：《Science China(Physics,Mechanics & Astronomy)》2011年第2期222-226,共5页中国科学：物理学、力学、天文学（英文版）

基　　金：supported in part by the Major State Basic Research Developing Program (Grant No 2007CB815000);the National Natural Science Foundation of China (Grant Nos 11005004, 10775004 and 10975008);the Southwest University Initial Research Foundation Grant to Doctor (Grant No.SWU110039);MZOS (Grant No 1191005-1010)

摘　　要：The rapid transition between spherical and γ-soft shapes in Zn isotopes in the mass A 70 region,is analyzed using excitation spectra and collective wave functions obtained by diagonalization of a five-dimensional Hamiltonian for quadrupole vibrational and rotational degrees of freedom,with parameters determined by constrained self-consistent relativistic mean-field calculations for triaxial shapes.The microscopic potential energy surfaces,together with the characteristic collective observables,illustrate a rapid transition from near spherical shape at the N = 40 subshell,to γ-soft deformed shapes for lighter isotopes.The calculated spectra display fingerprints of a second-order shape phase transition that can be approximately described by the E(5) analytic solution.The rapid transition between spherical and γ-soft shapes in Zn isotopes in the mass A 70 region,is analyzed using excitation spectra and collective wave functions obtained by diagonalization of a five-dimensional Hamiltonian for quadrupole vibrational and rotational degrees of freedom,with parameters determined by constrained self-consistent relativistic mean-field calculations for triaxial shapes.The microscopic potential energy surfaces,together with the characteristic collective observables,illustrate a rapid transition from near spherical shape at the N = 40 subshell,to γ-soft deformed shapes for lighter isotopes.The calculated spectra display fingerprints of a second-order shape phase transition that can be approximately described by the E（5） analytic solution.

关 键 词：quantum phase transitions E（5） critical-point symmetry five-dimensional Hamiltonian 

分 类 号：O562.6[理学—原子与分子物理]