Laser spectroscopy investigation of the nuclear moments and radii of lutetium isotopes
U. Georg1 - W. Borchers1 - M. Keim
- A. Klein1 - P. Lievens2 - R. Neugart1 -
M. Neuroth1, Pushpa M. Rao3 - Ch. Schulz1 and the ISOLDE Collaboration2
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
Abstract
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.
PACS
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
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