Shape-driving effects in the triaxial nucleus, Xe-128
Sep, 2006
12 pages
Published in:
- Phys.Rev.C 74 (2006) 034318
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Abstract: (APS)
An extended decay scheme for Xe128 has been constructed by using data from the Sn124(Be9, 5n)Xe128 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] ⊗1/2+[400] two-quasineutron configuration that forms the Kπ=5− intrinsic state at 2228 keV, and on a previously assigned Kπ=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 γ deformation and γ softness are predicted for the ground state and the Kπ=5− intrinsic state, whereas a nearly axially symmetric shape is predicted for the Kπ=8− two-quasiparticle configuration. The low value of the hindrance factor for the E1 transition depopulating the Kπ=8− intrinsic state is discussed in the context of analogous transitions in neighbouring N=74 isotones.- 27.60.+j
- 23.20.Lv
- 21.10.Re
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