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COMPETING PROTON AND NEUTRON ALIGNMENTS IN NEUTRON-DEFICIENT XE-NUCLEI

TORMANEN, S (author)
JUUTINEN, S (author)
JULIN, R (author)
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Cederwall, Bo (author)
JOHNSON, A (author)
WYSS, R (author)
AHONEN, P (author)
FANT, B (author)
MATSUZAKI, M (author)
NYBERG, J (author)
PIIPARINEN, M (author)
MITARAI, S (author)
MUKAI, J (author)
VIRTANEN, A (author)
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1994
1994
English.
In: Nuclear Physics A. - 0375-9474 .- 1873-1554. ; 572:2, s. 417-458
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • High-spin structures of the neutron-deficient Xe-117, Xe-118, Xe-120 isotopes have been studied by in-beam gamma-ray spectroscopic techniques. The final nuclei have been identified by means of charged-particle detectors. Collective rotational bands based on the neutron d5/2, 97/2 and h11/2 configurations have been identified in Xe-117. In the even Xe-118 and Xe-120 nuclei several new side bands were observed and the previously known bands were extended. The present level schemes include two positive-parity bands constructed to high spin in Xe-118, whereas in Xe-120 three such bands were observed. In order to explain these bands, both proton and neutron (h11/2)2 alignments, as well as the shape degree of freedom, have to be invoked. The possible occurrence of a gammaS-band is addressed and a pronounced structural change for more heavy Xe-isotopes is discussed. All negative-parity side bands are interpreted in terms of proton two-quasiparticle excitations. The experimental data are compared with total routhian surface calculations.

Subject headings

NATURVETENSKAP  -- Fysik -- Subatomär fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Subatomic Physics (hsv//eng)

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