Bochum 1998 – scientific programme
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HK: Hadronen und Kerne
HK 51: Spectroscopy VIII, Fission
HK 51.1: Talk
Wednesday, March 18, 1998, 14:00–14:15, E
γ–spectroscopy in the superdeformed minimum of 240Pu with the EUROBALL–Cluster–Cube⋆ — •D. Pansegrau1, H. Bauer1, J. Eberth2, T. Härtlein1, F. Köck1, P. Reiter3, D. Schwalm1, and H.G. Thomas2 — 1MPI für Kernphysik Heidelberg — 2Institut für Kernphysik Köln — 3Argonne National Laboratory
In order to investigate γ–decays of excited states in the Second Minimum of the double–humped fission barrier of 240Pu, an experiment was performed during the CLUSTER–campaign of the German EUROBALL–collaboration at the MPI für Kernphysik in Heidelberg.
The superdeformed minimum was populated via an (α,2n)–reaction. After the prompt decay of excited states to the ground state of 240mPu, the nucleus decays via fission with a half life of 3.8 ns which gives an unambiguous trigger for the population of the form isomer. The extremely rare γ–decays in the Second Minimum were detected with six CLUSTER–detectors arranged in the highly efficient CUBE–setup.
The spectrum of prompt γ–rays followed by a delayed fission is dominated by a transition at 786 keV. Other, weaker transitions in the region of 550 keV and 800 keV are observed, too. Together with the results of a previous experiment with the Heidelberg–Darmstadt crystal ball, an interpretation of the observed transitions will be given.
⋆ supported by BMBF