A panorama of excited-state g-factor measurements: Advancing moment measurements on radioactive beams

Patterns in the systematics of g factors for the first excited states of even-even nuclei are explored across the nuclear landscape for heavy nuclei (A > 90). The pathway to collectivity from semimagic to mid-shell nuclei is discussed, and attention given to the different behavior of nuclei either side of N 82. As most g(2⁺₁) data is for nuclides near the valley of stability, the development of the recoil in vacuum technique for moment measurements on radioactive beams is discussed,with particular attention given to the free-ion hyperfine fields of Se and Ge ions leaving carbon foils with velocities of about 5% of the speed of light.