Magnetic dipole and electric quadrupole moments of the neutron-deficient bismuth isotopes

The complete hyperfine structures of the A= 202, 203 and 204 bismuth isotopes have been observed in the 306.7 nm line using an extremely sensitive gas cell technique of laser spectroscopy. The magnetic moments, quadrupole moments and relative changes in the mean square charge radii have been extracted and have been used to study the bulk and valence nuclear behaviour around 208Pb. The trends of the quadrupole moments of the proton-particle, neutron-hole ground and isomeric systems are observed to be very nearly identical throughout the Z ≥82, N≤126 region. Furthermore the correspondence between the behaviour of Qs and the behaviour of the ground state charge radii demonstrates that the global systematics of this region are closer than those of any other. (orig.)