Elsevier

Nuclear Physics A

Volume 572, Issue 2, 23 May 1994, Pages 417-458
Nuclear Physics A

Competing proton and neutron alignments in neutron-deficient Xe-nuclei

https://doi.org/10.1016/0375-9474(94)90183-XGet rights and content

Abstract

High-spin structures of the neutron-deficient 117,118,120Xe isotopes have been studied by in-beam γ-ray spectroscopic techniques. The final nuclei have been identified by means of charged-particle detectors. Collective rotational bands based on the neutron d52, g72 and h112 configurations have been identified in 117Xe. In the even 118Xe and 120Xe 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 118Xe, whereas in 120Xe three such bands were observed. In order to explain these bands, both proton and neutron (h112)2 alignments, as well as the shape degree of freedom, have to be invoked. The possible occurrence of a γS-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.

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    1

    Present address: Lawrence Berkeley Laboratory, Nuclear Science Division, Berkeley, CA 94720, USA.

    2

    Present address: Department of Radiation Sciences and The Svedberg Laboratory, Uppsala University, S-75121 Uppsala, Sweden.

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