Collective bands in the triaxial nucleus Xe-124

Citation
V. Werner et al., Collective bands in the triaxial nucleus Xe-124, NUCL PHYS A, 692(3-4), 2001, pp. 451-475
Citations number
35
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
NUCLEAR PHYSICS A
ISSN journal
0375-9474 → ACNP
Volume
692
Issue
3-4
Year of publication
2001
Pages
451 - 475
Database
ISI
SICI code
0375-9474(20010924)692:3-4<451:CBITTN>2.0.ZU;2-Z
Abstract
The nonyrast states of Xe-124 have been investigated with the Te-123(He-3, 2n) reaction by means of in-beam gamma -spectroscopy using a setup of 6 Com pton-suppressed high-purity-germanium (HPGe) detectors. More than 65 new tr ansitions, establishing 34 new levels, were observed, gamma gamma -angular correlations were analyzed to assign spins and parities to the low-lying st ates, and to determine the multipolarities of the gamma -transitions. In ad dition, the gamma -excitation-function method was used for spin assignments . With these methods 10 (18) spin and parity assignments were made (some of them tentative) and 7 multipole mixing ratios could be determined. The exc itation energies and B(E2) ratios of low-lying states are compared with pre dictions of the sd-IBM-1, giving rise to the identification of a 0(+) state with O(6) quantum number sigma = N - 2, Quadrupole shape invariants for th e ground state and effective deformation parameters are calculated, showing an admixture of U(5) symmetry to the ground-state wave function. (C) 2001 Elsevier Science B.V. All rights reserved.