High spin spectroscopy for A approx 160 nuclei

Conference · Sun Jan 01 04:00:00 EST 1989

OSTI ID:7016962

Yu, C -H ^[1]; Gascon, J; Garrett, J D; Hagemann, G B ^[2]

---

1. Niels Bohr Inst., Copenhagen (Denmark) Tennessee Univ., Knoxville, TN (USA). Dept. of Physics and Astronomy
2. Niels Bohr Inst., Copenhagen (Denmark)

Experimental routhians, alignments, band crossing frequencies, and the B(M1)/B(E2) ratios of the N = 90 isotopes and several light Lu (N = 90--96) isotopes are summarized and discussed in terms of shape changes. These systematic analyses show a neutron and proton number dependent deformations (both quadruple and {gamma} deformations) for these light rare earth nuclei. The stability of the nuclear deformation with respect to {beta} and {gamma} is also found to be particle number dependent. Such particle number dependent shapes can be attributed to the different locations of the proton and neutron Fermi levels in the Nilsson diagrams. Configurations dependent shapes are discussed specially concerned the deformation difference between the proton h{sub 9/2}1/2{sup -}(541) and the high-K h{sub 11/2} configurations. The observed large neutron band crossing frequencies in the h{sub 9/2}1/2{sup -}(541) configuration support the predicted large deformation of this configuration but can be reproduced by the cranked shell model calculation according to the predicted deformations. Lifetime measurement for {sup 157}Ho, one of the nuclei that show a large {h bar}{omega}{sup c} in the 1/2{sup -}(541) band, indicates that deformation difference can only account for 20% of such shift in {h bar}{omega}{sub c}. 55 refs., 12 figs.

• Research Organization: Tennessee Univ., Knoxville, TN (USA). Dept. of Physics and Astronomy
• Sponsoring Organization: DOE/ER
• DOE Contract Number: FG05-87ER40361
• OSTI ID: 7016962
• Report Number(s): CONF-8909247-4; ON: DE90007058
• Country of Publication: United States
• Language: English

Related Subjects

651820* -- Nuclear Properties & Reactions
A=150-189
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
AMPLITUDES
ANGULAR MOMENTUM
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BRANCHING RATIO
DEFORMATION
ERBIUM 158
ERBIUM ISOTOPES
EVEN-EVEN NUCLEI
HOLMIUM 157
HOLMIUM ISOTOPES
HOURS LIVING RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
ISOTOPES
LUTETIUM ISOTOPES
NUCLEAR DEFORMATION
NUCLEI
ODD-EVEN NUCLEI
PARTICLE PROPERTIES
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
SPECTROSCOPY
SPIN
THULIUM 159
THULIUM ISOTOPES
TRANSITION AMPLITUDES
YTTERBIUM 160
YTTERBIUM ISOTOPES