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HK: Fachverband Physik der Hadronen und Kerne

HK 34: Postersitzung

HK 34.83: Poster

Donnerstag, 13. März 2008, 14:00–16:00, Poster C3

Identification of single particle states in superdeformed ²³⁷Pu — •T. Morgan¹, B. Bruyneel¹, L. Csige¹, I. Daoutidis¹, D. Habs², T. Kotthaus², R. Lutter¹, H. J. Maier¹, P. Reiter², P. Ring³, O. Schaile¹, W. Schwerdtfeger¹, P.G. Thirolf¹, and N. Warr² — ¹LMU, Germany — ²Universität zu Köln, Germany — ³TUM, Germany

As the first case ever studied with high - resolution γ spectroscopy for odd-N nuclei in the second potential minimum, the fission isomers in ²³⁷Pu (t_1/2= 110ns/1.1 µs) were investigated using the ²³⁵U(α,2n) reaction with a pulsed α beam (E_α=24 MeV, Δt = 400 ns) from the Cologne Tandem accelerator. A metallic ²³⁵U target (3.7 mg/cm²) was used, where the ²³⁷Pu reaction products were stopped and fission products were emitted in opposite directions. The rare γ-rays from the second potential well in delayed coincidence with fission products were measured with the MINIBALL spectrometer. The identified level scheme will be presented and compared to single - particle calculations allowing for the first time an identification of the Nilsson quantum numbers. The identification of Nilsson orbitals will provide an important input for the validation and improvement of theoretical nuclear models and will lead to improved predictions for fission barriers and their extrapolations to neutron-rich heavy elements in the mass region of the r-process path of the astrophysical nucleosynthesis.

*Supported by the DFG under contract no. HA1101/12-1 and in the framework of: The Cluster of Excellence for Fundamental Physics: The Origin and structure of the Universe.