Calculations of electric quadrupole moments and charge radii for high- K isomers

Configuration-constrained potential-energy-surface calculations are performed to investigate high-K isomers in ⁹⁷Y, ¹³⁰Ba, ¹⁷⁶Yb, ¹⁷⁷Lu, and ¹⁷⁸Hf that were observed to have increased electric quadrupole moments but decreased charge radii relative to the states on which they are built. Taking into account the effects of deformation change and unpaired protons, our calculations can reproduce the enhancement of electric quadrupole moments for the isomers in ⁹⁷Y, ¹³⁰Ba, ¹⁷⁶Yb, ¹⁷⁷Lu and the K^π = 8^‑ isomer in ¹⁷⁸Hf, and can reproduce the reduction of charge radii for the K^π = 27/2^‑ isomer in ⁹⁷Y and the K^π = 16⁺ isomer in ¹⁷⁸Hf.