Phase change near N=70 in the wave function of the Iπ=11/2- isomers along the cadmium-isotope chain

الأصل · EN

The electromagnetic features of the 11/2- isomers in the ¹¹¹⁻¹²⁷Cd isotopes are reproduced by numerically optimized shell-model wave-functions. A sudden phase change of the wave functions at N = 70 is identified and further confirmed by the evolution of B(E2, 7/2-₁→ 11/2-₁) values. This phase change gives rise to different linear relations for the Q and μ values with N<70 and N>70, as needed to reproduce the experimental data. The particle-hole transformation properties for h₁₁/₂ neutrons in a well-isolated subshell involving degenerate s₁/₂, d₃/₂, d₅/₂ and h₁₁/₂ orbits is suggested as a possible explanation for this phase change.