Evolution of nuclear shapes at high spins

Conference · Tue Jan 01 00:00:00 EST 1985

OSTI ID:5253825

Johnson, N R

The dynamic electric quadrupole (E2) moments are a direct reflection of the collective aspects of the nuclear wave functions. For this, Doppler-shift lifetime measurements have been done utilizing primarily the recoil-distance technique. The nuclei with neutron number N approx. 90 possess many interesting properties. These nuclei have very shallow minima in their potential energy surfaces, and thus, are very susceptible to deformation driving influences. It is the evolution of nuclear shapes as a function of spin or rotational frequency for these nuclei that has commanded much interest in the lifetime measurements discussed here. There is growing evidence that many deformed nuclei which have prolate shapes in their ground states conform to triaxial or oblate shapes at higher spins. Since the E2 matrix elements along the yrast line are sensitive indicators of deformation changes, measurements of lifetimes of these states to provide the matrix elements has become the major avenue for tracing the evolving shape of a nucleus at high spin. Of the several nuclei we have studied with N approx. 90, those to be discussed here are /sup 160,161/Yb and /sup 158/Er. In addition, the preliminary, but interesting and surprising results from our recent investigation of the N = 98 nucleus, /sup 172/W are briefly discussed. 14 refs., 5 figs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5253825
• Report Number(s): CONF-850942-24; ON: DE85018074
• Resource Relation: Conference: 190. American Chemical Society national meeting, Chicago, IL, USA, 8 Sep 1985
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ERBIUM 158
HIGH SPIN STATES
NUCLEAR DEFORMATION
QUADRUPOLE MOMENTS
TUNGSTEN 172
YTTERBIUM 160
YTTERBIUM 161
E2-TRANSITIONS
EXPERIMENTAL DATA
MATRIX ELEMENTS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
DATA
DEFORMATION
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
ERBIUM ISOTOPES
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
HOURS LIVING RADIOISOTOPES
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOTOPES
MINUTES LIVING RADIOISOTOPES
MULTIPOLE TRANSITIONS
NUCLEI
NUMERICAL DATA
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
TUNGSTEN ISOTOPES
YTTERBIUM ISOTOPES
651823* - Nuclear Properties & Reactions
A=150-189
Experimental- Energy Levels & Transitions- (-1987)