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HK: Physik der Hadronen und Kerne

HK 12: Poster Session: Instrumentation and Applications

HK 12.13: Poster

Dienstag, 9. März 2004, 13:30–15:30, Foyer

A set up for High-Resolution Studies of Odd-N Fission Isomers^* — •T. Morgan¹, C. Alvarez¹, B. Bruyneel², A. Bürger³, D. Habs¹, R. Hertenberger¹, N. Holzapfel¹, H. Hübel³, H.-J. Maier¹, E. Mergel³, P. Reiter², C. Schürmann¹, W. Schwerdtfeger¹, and P. Thirolf¹ — ¹Ludwig Maximilians Universität Müechen — ²Universität zu Köln — ³Rheinische Friedrich-Wilhelms Universität Bonn

In order to prepare for conversion electron and γ - ray spectroscopy studies of the odd-N fission isomers in ²³⁷Pu, following the ²³⁵U(α,2n) reaction [1], the small population cross section (ca. 1µb), requires a large solid angle coverage both for the γ rays as well as for the (delayed) fission fragments. An economical solution for the fission fragment detection is provided by the use of commercially available silicon solar cells. Two detector arrays were developed for conversion electron studies with Mini Oranges and γ - spectroscopic studies with the highly efficient MINIBALL spectrometer, respectively. Test experiments have been performed (i) to characterise the timeing properties of the solar cells intended to act as trigger detectors between prompt and delayed fission and (ii) to commission the set up at the MINIBALL spectrometer at the IKP in Cologne, allowing to use thick, metallic highly-oxidising ²³⁵U targets. *Supported by MLL and the DFG under contract number HA 1101/6-3

[1] P. Thirolf and D. Habs, Progr. Part. Nucl. Phys. 49 325 (2002)