Collective bands in the triaxial nucleus 124Xe

✍ Scribed by V. Werner; H. Meise; I. Wiedenhöver; A. Gade; P. von Brentano

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 359 KB
• Volume: 692
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(01)00655-8

✦ Synopsis

The nonyrast states of 124 Xe have been investigated with the 123 Te( 3 He, 2n) reaction by means of in-beam γ -spectroscopy using a setup of 6 Compton-suppressed high-purity-germanium (HPGe) detectors. More than 65 new transitions, establishing 34 new levels, were observed. γ γ -angular correlations were analyzed to assign spins and parities to the low-lying states, and to determine the multipolarities of the γ -transitions. In addition, the γ -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 excitation energies and B(E2) ratios of low-lying states are compared with predictions of the sd-IBM-1, giving rise to the identification of a 0 + state with O(6) quantum number σ = N -2. Quadrupole shape invariants for the ground state and effective deformation parameters are calculated, showing an admixture of U(5) symmetry to the ground-state wave function.