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A compact multi-plate fission chamber for the simultaneous measurement of 233U capture and fission cross-sections.
- Source :
- EPJ Web of Conferences; 2017, Vol. 146, p1-4, 4p
- Publication Year :
- 2017
-
Abstract
- <superscript>233</superscript>U plays the essential role of fissile nucleus in the Th-U fuel cycle. A particularity of <superscript>233</superscript>U is its small neutron capture cross-section which is about one order of magnitude lower than the fission cross-section on average. Therefore, the accuracy in the measurement of the <superscript>233</superscript>U capture cross-section essentially relies on efficient capture-fission discrimination thus a combined setup of fission and -detectors is needed. At CERN n TOF the Total Absorption Calorimeter (TAC) coupled with compact fission detectors is used. Previously used MicroMegas (MGAS) detectors showed significant γ -background issues above 100 eV coming from the copper mesh. A new measurement campaign of the <superscript>233</superscript>U capture cross-section and alpha ratio is planned at the CERN n TOF facility. For this measurement, a novel cylindrical multi ionization cell chamber was developed in order to provide a compact solution for 14 active targets read out by 8 anodes. Due to the high specific activity of <superscript>233</superscript>U fast timing properties are required and achieved with the use of customized electronics and the very fast ionizing gas CF<subscript>4</subscript> together with a high electric field strength. This paper describes the new fission chamber and the results of the first tests with neutrons at GELINA proving that it is suitable for the <superscript>233</superscript>U measurement. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 21016275
- Volume :
- 146
- Database :
- Complementary Index
- Journal :
- EPJ Web of Conferences
- Publication Type :
- Conference
- Accession number :
- 125180745
- Full Text :
- https://doi.org/10.1051/epjconf/201714603027