Nuclear quadrupole moment of Ca-43 and hyperfine-structure studies of its singly charged ion

By combining our theoretical calculation and the recently measured electric quadrupole hyperfine-structure constant of the 3d D-2(5/2) state in the singly ionized Ca-43, we determine its nuclear quadrupole moment to 1% accuracy. The obtained result, -0.0444(6)b, is about 10% more accurate over its current accepted value. We have employed the relativistic coupled-cluster theory at the single and double excitations level to calculate the atomic wave functions. The accuracy of these wave functions is estimated by comparing our calculated magnetic dipole hyperfine constants with their corresponding available experimental results of many low-lying states. We also present hyperfine-structure constants for other higher excited states where experimental results are not reported. The role of the Breit interaction has been investigated in these properties.