Berlin 2005 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 22: Postersitzung

HK 22.70: Poster

Montag, 7. März 2005, 16:30–18:00, TU MA141

A set up for High-Resolution γ - spectroscopy of Odd-N Fission Isomers* — •T. Morgan¹, B. Bruyneel², D. Habs¹, R. Hertenberger¹, H. Hübel³, O. Koschorreck⁴, H.-J. Maier¹, P. Reiter², W. Schwerdtfeger¹, T. Striepling² und P. G. Thirolf¹ — ¹Ludwig Maximilians Universität München — ²Universität zu Köln — ³Rheinische Friedrich-Wilhelms Universität Bonn — ⁴Max-Planck-Institut für Kernphysik, Heidelberg

While so far spectroscopic studies of fission isomers concentrated on even - even nuclei, high - resolution γ - spectroscopy of odd - N fission isomers will allow to identify Nilsson orbitals in heavy actinide nuclei. In order to prepare for the investigation of ²³⁷Pu, following the ²³⁵U(α,2n) reaction, the small population cross section (ca. 2 µb), requires a large solid angle coverage both for the γ - rays as well as for the fission fragments. A very compact 4π parallel plate detector array will be used for the fission fragment detection. Design and characteristics of the array will be presented. The excellent time resolution of the PPAC’s will allow to distinguish between the dominant prompt fission products and the rare isomeric fission events (t_1/2 = 110 ns ; 1.1 µs). The extremely rare γ - rays from the second potential energy minimum are planned to be investigated with eight EUROBALL Ge CLUSTER - detectors (56 Ge crystals) arranged in a highly efficient set up. A self supporting thick metallic ²³⁵U target will be used, where the ²³⁷Pu reaction products will be stopped and fission products will be emitted in opposite directions into the PPAC array.

*Supported the DFG under Contract number HA1101/12-1