Evolution of nuclear shapes at high spins

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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 ... continued below

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Pages: 8

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Johnson, N.R. January 1, 1985.

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Description

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.

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Pages: 8

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NTIS, PC A02/MF A01.

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  • 190. American Chemical Society national meeting, Chicago, IL, USA, 8 Sep 1985

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  • Other: DE85018074
  • Report No.: CONF-850942-24
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 5253825
  • Archival Resource Key: ark:/67531/metadc1067084

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Office of Scientific & Technical Information Technical Reports

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  • January 1, 1985

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  • Feb. 4, 2018, 10:51 a.m.

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  • March 20, 2018, 8:41 p.m.

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Johnson, N.R. Evolution of nuclear shapes at high spins, article, January 1, 1985; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1067084/: accessed August 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.