Study of the level structure of239U using the thermal neutron capture reaction |
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Authors: | H G Börner H R Koch H Seyfarth T von Egidy W Mampe J A Pinston K Schreckenbach D Heck |
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Institution: | 1. Institut für Kernphysik, Kernforschungsanlage Jülich, Jülich, Germany 2. Institut Laue-Langevin, Grenoble, France 3. Institut für Angewandte Kernphysik, Kernforschungszentrum Karlsruhe, Karlsruhe, Germany
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Abstract: | For the investigation of vibrational states in odd A nuclei we have studied the level structure of239U by the238U (n thermal,γ) reaction. Various complementary measurement techniques as curved-crystal-, anti-Compton-,γ-γ coincidence- and conversion electron spectroscopy have been applied. The resulting data have been used to establish the deexcitation scheme of239U up to ~1.3 MeV and to make spin assignments. Most of the levels are interpreted in terms of the Nilsson model. The data also indicate the presence of the Nilsson states ¦501?¦ and ¦750¦. Three members of theΒ-vibrational band built on the ¦631?¦ state and one member of theΒ-vibration built on the ¦622↑¦ ground state have been identified through transitions with strongE0 admixtures. The octupole vibrational state built on the ¦631?¦ band is proposed at 815 keV. |
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