1. Proton-neutron multiplet states and isomers in the odd-odd nucleus 122I.
- Author
-
Moon, B., Moon, C.-B., Dracoulis, G. D., Bark, R. A., Byrne, A. P., Davidson, P. A., Lane, G. J., Kibédi, T., Wilson, A. N., and Yuan, C.
- Subjects
- *
ISOMERS , *NEUTRONS , *QUADRUPOLES , *IODINE , *PROTONS , *ACCELERATOR mass spectrometry , *PROTON beams , *TANDEM mass spectrometry - Abstract
The level structure of the odd-odd iodine nucleus 122I has been studied by the 120Sn(7Li, 5n) 122I reaction at Elab = 58 MeV. Two chopped beams from the 14UD (Unit Doubled) tandem heavy-ion accelerator at the Australian National University were used; one was a nanosecond (ns) pulsed-beam with separation of 1.7 microseconds (μs) and the second one was a 60-μs beam separated by 880 μs. Through in-beam and out-of-beam γ-ray spectroscopy, the complex proton-neutron multiplet states, including isomers with half-lives of a few tens of ns to a few tens of μs, have been identified. Collective states based on the proton h11/2 orbital exhibit two kinds of structure depending upon the coupled neutron orbital: a quadrupole vibration when involving the h11/2 orbital and a γ-soft deformed rotation when involving the g7/2 orbital. With spherical shell model and deformed shell-model calculations, the observed level structures are explained. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF