Band structures in 116I

✍ Scribed by C.-B. Moon; T. Komatsubara; K. Furuno

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 533 KB
• Volume: 730
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/j.nuclphysa.2003.10.006

✦ Synopsis

The band structures of the doubly-odd nucleus 116 I have been studied by using in-beam γ -ray spectroscopy with the 103 Rh( 16 O, 3n) 116 I reaction at an energy of E lab = 80 MeV. The beam was provided by the 12UD tandem accelerator at the University of Tsukuba. Absolute excitation energies for the observed collective bands except for a band based on the π(h 11/2 )ν(g 7/2 ) configuration have been definitely determined. The positive-parity rotational band based on the π(h 11/2 )ν(h 11/2 ) configuration is built on the 8 + level at 874.3 keV and exhibits a spin inversion below I = 14 h. A new vibration-like band built on the 8 -level at 468.5 keV has been identified and can be interpreted as resulting from the π(g 7/2 )ν(h 11/2 ) configuration coupled to the Te core vibration. A negativeparity band built on the 14 -level at 2547.6 keV shows a vibration-like structure and terminates its collectivity at the 24 -level at 6215.0 keV. The total Routhian surface calculations suggest a noncollective oblate state with β 2 = 0.182 and γ = 60 • based on a fully aligned six-quasiparticle, π[h 11/2 (g 7/2 ) 2 ]ν[g 7/2 (h 11/2 ) 2 ], configuration for this 24 -level. The excitation energy of the 7 - isomer with T 1/2 = 3.27 µs was found to be at 430.4 keV.