Laser spectroscopy investigation of the nuclear moments and radii of lutetium isotopes
1 Institut für Physik, Universität Mainz, D-55099 Mainz, Germany
2 EP Division, CERN, CH-1211 Geneva 23, Switzerland
3 Spectroscopy Division, Bhabha Atomic Research Centre, Bombay, India
Received: 28 April 1998 / Revised version: 22 July 1998 Communicated by D. Schwalm
Collinear laser spectroscopy experiments in the LuI transition were performed on all lutetium isotopes in the range of 161-179Lu. The nuclear spins, magnetic moments and quadrupole moments were determined from the hyperfine structures observed for 19 ground states and 11 isomers. Variations in the mean square charge radii as a function of neutron number were obtained from the isotope shifts. These data considerably extend the systematics of the properties of nuclei in the upper rare-earth region. A particular feature is the appearance of high-spin and low-spin ground states and isomeric states in the vicinity of the stable 175Lu, partly arising from aligned neutron pairs. The results clearly show that the deformation properties are nearly independent of the occupancy and the coupling of single-particle states. Theoretical predictions of deformation are confirmed in a consistent description of the measured radii and quadrupole moments. For all observed states, the spins and magnetic moments allow the assignment of rather pure Nilsson configurations.
21.10.Ft Charge distribution - 21.10.Hw Spin, parity, and isobaric spin - 21.10.Ky Electromagnetic moments - 27.70.+q - 32.10.Fn Fine and hyperfine structure