51. Band structures in 116I
- Author
-
Kohei Furuno, Tetsuro Komatsubara, and Chang-Bum Moon
- Subjects
Physics ,Nuclear reaction ,Nuclear and High Energy Physics ,Routhian ,Oblate spheroid ,Tandem accelerator ,Atomic physics ,Spectroscopy ,Excitation - Abstract
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 =14ℏ. 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 negative-parity 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.
- Published
- 2004