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Shape-Driving Effects in the Triaxial Nucleus, Xe-128

Orce, J N, Bruce, A M, Emmanouilidis, A, Byrne, A P, Dracoulis, G D, Kibedi, T, Caamano, M, El-Masri, H, Pearson, C J, Podolyak, Z, Stevenson, P D, Walker, P M, Xu, F R, Cullen, D M and Wheldon, C (2006) Shape-Driving Effects in the Triaxial Nucleus, Xe-128 Physical Review C, 74 (3). ISSN 0556-2813

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Abstract

An extended decay scheme for Xe-128 has been constructed by using data from the Sn-124(Be-9, 5n)Xe-128 reaction at a beam energy of 58 MeV. Bands have been identified as being built on several intrinsic states, including a proposed 9/2(-)[514] circle times 1/2(+)[400] two-quasineutron configuration that forms the K-pi=5(-) intrinsic state at 2228 keV, and on a previously assigned K-pi=8(-) intrinsic state at 2786 keV. A half-life of 73(3) ns has been measured for the latter. Theoretical calculations have been performed by using the configuration-constrained blocking method based on a nonaxial Woods-Saxon potential. Large gamma deformation and gamma softness are predicted for the ground state and the K-pi=5(-) intrinsic state, whereas a nearly axially symmetric shape is predicted for the K-pi=8(-) two-quasiparticle configuration. The low value of the hindrance factor for the E1 transition depopulating the K-pi=8(-) intrinsic state is discussed in the context of analogous transitions in neighbouring N=74 isotones.

Item Type: Article
Additional Information: Published in <i>Physical Review C,</i> Vol. 74, Iss. 3. Copyright 2006 American Physical Society. Click <a href=http://prc.aps.org/>here</a> to access the journal's website.
Divisions: Faculty of Engineering and Physical Sciences > Physics
Depositing User: Mr Adam Field
Date Deposited: 27 May 2010 14:08
Last Modified: 23 Sep 2013 18:27
URI: http://epubs.surrey.ac.uk/id/eprint/348

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