Measurement of the neutron capture cross section of 234-U in n TOF at CERN
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hdl:2117/10627
Tipus de documentText en actes de congrés
Data publicació2006
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Abstract
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.
CitacióCalviño, 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.
ISBN0-89448-697-7
Versió de l'editorhttp://www.new.ans.org/store/i_700323
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