Description of the Rigid Triaxial Deformation at Low Energy in ⁷⁶Ge with the Proton-Neutron Interacting Model IBM2

【摘要】 We investigate properties of the low-lying energy states for⁷⁶Ge within the framework of the proton-neutron interacting model IBM2,considering the validity of the Z=38 subshell closure⁸⁸Sr₅₀as a doubly magic core.By introducing the quadrupole interactions among like bosons to the IBM2 Hamiltonian,the energy levels for both the ground state andγbands are reproduced well.Particularly,the doublet structure of theγband and the energy staggering signature fit the experimental data correctly.The ratios of B（E2）transition strengths for some states of theγband,and the g factors of the 2₁⁺,2₂⁺states are very close to the experimental data.The calculation result indicates that the nucleus exhibiting rigid triaxial deformation in the low-lying states can be described rather well by the IBM2.更多还原

【Abstract】 We investigate properties of the low-lying energy states for ⁷⁶Ge within the framework of the proton-neutron interacting model IBM2,considering the validity of the Z = 38 subshell closure ⁸⁸Sr₅₀ as a doubly magic core.By introducing the quadrupole interactions among like bosons to the IBM2 Hamiltonian,the energy levels for both the ground state and γ bands are reproduced well.Particularly,the doublet structure of the γ band and the energy staggering signature fit the experimental data correctly.The ratios of B（E2） transition strengths for some states of the γ band,and the g factors of the 2₁⁺,2₂⁺ states are very close to the experimental data.The calculation result indicates that the nucleus exhibiting rigid triaxial deformation in the low-lying states can be described rather well by the IBM2.更多还原