A novel approach for the anomalous collectivity in neutron-deficient Os isotopes  

作　　者：Wei Teng Yu Zhang Chong Qi 滕威;张宇;亓冲(Department of Physics,Liaoning Normal University,Dalian 116029,China;Department of Physics,KTH Royal Institute of Technology,Stockholm 10691,Sweden)

机构地区：[1]Department of Physics,Liaoning Normal University,Dalian 116029,China [2]Department of Physics,KTH Royal Institute of Technology,Stockholm 10691,Sweden

出　　处：《Chinese Physics C》2025年第1期207-215,共9页中国物理C(英文版)

基　　金：Supported by the Natural Science Foundation of China(12375113,11875158)。

摘　　要：An algebraic model with three-body boson interactions is proposed to incorporate the different quadrupole modes in nuclear collectivity.It is shown that the recently observed anomalous collective structure characterized by B_(4/2)=B(E2;4_(1)→2_(1))/B(E2;2_(1)→0_(1))<1.0 and R_(4/2)=E(4_(1))/E(2_(1))≥2.0,which cannot yet be explained by any other microscopic nuclear models,naturally emerges in the present model due to the inclusion of triaxial rotor modes.This description is further extended to describe odd-A nuclei by including the coupling to the Fermion degree of freedom.This allows us to give a unified explanation of the anomalous B(E2)strengths in both even-even and even-odd systems,which indicate different behaviors.As examples,the model is applied to describe the spectroscopy and E2 transition properis of^(168,169,170,171)Os.All recent measurements of these isotopes can be wel reproduced on the same footing,which suggests that the anomalous collectivity persists even in odd-A systems.

关 键 词：interacting boson model B(E2)anomaly triaxial deformation threebody interaction 

分 类 号：O572.2[理学—粒子物理与原子核物理]