Ground-State Electromagnetic Moments of Calcium Isotopes
Abstract
High-resolution bunched-beam collinear laser spectroscopy was used to measure the optical hyperfine spectra of the 43-51Ca isotopes. The ground state magnetic moments of 49,51Ca and quadrupole moments of 47,49,51Ca were measured for the first time, and the 51Ca ground state spin I=3/2 was determined in a model-independent way. Our results provide a critical test of modern nuclear theories based on shell-model calculations using phenomenological as well as microscopic interactions. The results for the neutron-rich isotopes are in excellent agreement with predictions using interactions derived from chiral effective field theory including three-nucleon forces, while lighter isotopes illustrate the presence of particle-hole excitations of the 40Ca core in their ground state.