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Title: Evolution of nuclear shapes at high spins

Abstract

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 = 98more » nucleus, /sup 172/W are briefly discussed. 14 refs., 5 figs.« less

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

Citation Formats

Johnson, N R. Evolution of nuclear shapes at high spins. United States: N. p., 1985. Web.
Johnson, N R. Evolution of nuclear shapes at high spins. United States.
Johnson, N R. Tue . "Evolution of nuclear shapes at high spins". United States. https://www.osti.gov/servlets/purl/5253825.
@article{osti_5253825,
title = {Evolution of nuclear shapes at high spins},
author = {Johnson, N R},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/5253825}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1985},
month = {1}
}

Conference:
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