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Citació: Calviño, F. [et al.]. Measurement of the neutron capture cross section of 234-U in n TOF at CERN. A: International Topical Meeting on Advances in Reactor Physics. "PHYSOR-2006 Topical Meeting on Reactor Physics: Advances in Nuclear Analysis and Simulation". Vancouver: 2006, p. 1-10.
Títol: Measurement of the neutron capture cross section of 234-U in n TOF at CERN
Autor: Calviño Tavares, Francisco Veure Producció científica UPC; Cortés Rossell, Guillem Pere Veure Producció científica UPC; Poch Parés, Agustí Veure Producció científica UPC; Pretel Sánchez, Carme Veure Producció científica UPC
Data: 2006
Tipus de document: Conference report
Resum: Accurate and reliable neutron capture cross sections are needed in many research areas, including stellar nucleosynthesis, advanced nuclear fuel cycles, waste transmutation, and other applied programs. In particular, the accurate knowledge of 234U(n, ) reaction cross section is required for the design and realization of nuclear power stations based on the thorium fuel cycle. We have measured the neutron capture cross section of 234U at the recently constructed neutron time-of-flight facility n TOF at CERN [2] in the energy range from 0.03 eV to 1 MeV with high accuracy due to a combination of features unique in the world: A high instantaneous neutron fluence and excellent energy resolution of the n TOF facility, an innovative Data Acquisition System based on flash ADCs [3] and the use of a high performance 4 BaF2 Total Absorption Calorimeter (TAC) as a detection device [4, 5]. In this paper, we will describe the experimental apparatus including the various TAC components and its performance. We also will present results from the 234U(n, ) measurement. A sample of 38.7 mg of 234U3O8 was pressed into a pellet and doubly encapsulated between Al and Ti foils which were 0.15 mm and 0.2 mm thick, respectively. Monte-Carlo simulations with GEANT4 [6] of the detector response have been performed. After the background subtraction and correction with dead time and pile-up, the capture yield from 0.03 eV up to 1.5 keV was derived. Preliminary analysis of the capture yield in terms of R-matrix resonance parameters is discussed.
ISBN: 0-89448-697-7
URI: http://hdl.handle.net/2117/10627
Versió de l'editor: http://www.new.ans.org/store/i_700323
Apareix a les col·leccions:GREENER - Grup de recerca d´estudis energètics i de les radiacions. Ponències/Comunicacions de congressos
Departament de Física i Enginyeria Nuclear. Ponències/Comunicacions de congressos
Altres. Enviament des de DRAC
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