科研之友
微信
新浪微博
Facebook
分享链接
摘要
Background: Triaxiality in nuclear low-lying states has attracted great interest for many years. Recently, reduced transition probabilities for levels near the ground state in Ru-110 have been measured and provided strong evidence of a triaxial shape of this nucleus. @@@ Purpose: The aim of this work is to provide a microscopic study of low-lying states for Ru isotopes with A approximate to 100 and to examine in detail the role of triaxiality and the evolution of quadrupole shapes with the isospin and spin degrees of freedom. @@@ Method: Low-lying excitation spectra and transition probabilities of even-even Ru isotopes are described at the beyond-mean-field level by solving a five-dimensional collective Hamiltonian with parameters determined by constrained self-consistent mean-field calculations based on the relativistic energy density functional PC-PK1. @@@ Results: The calculated energy surfaces, low-energy spectra, and intraband and interband transition rates, as well as some characteristic collective observables, such as E(4(g.s).(+))/E(2(g.s.)(+)), E(2(gamma)(+))/E(4(g.s.)(+)), and B(E2; 2(g.s.)(+) -> 0(g.s.)(+)) and gamma-band staggerings, are in good agreement with the available experimental data. @@@ Conclusions: The main features of the experimental low-lying excitation spectra and electric transition rates are well reproduced and, thus, strongly support the onset of triaxiality in the low-lying excited states of Ru isotopes around Ru-110.
