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COMPETING PROTON AND NEUTRON ALIGNMENTS IN NEUTRON-DEFICIENT XE-NUCLEI
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1994 (English)In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 572, no 2, 417-458 p.Article in journal (Refereed) Published
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Abstract [en]

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.

Place, publisher, year, edition, pages
1994. Vol. 572, no 2, 417-458 p.
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Subatomic Physics
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URN: urn:nbn:se:kth:diva-178684DOI: 10.1016/0375-9474(94)90183-XISI: A1994NN28000010OAI: oai:DiVA.org:kth-178684DiVA: diva2:878216
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NR 2015

Available from: 2015-12-08 Created: 2015-12-08 Last updated: 2017-12-01Bibliographically approved

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Cederwall, Bo

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