Köln 2004 – wissenschaftliches Programm
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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)