Spatial distribution of thorium fission rate in a fast spallation and fission neutron field: An experimental and Monte Carlo study

The Energy plus Transmutation (EpT) set-up of the Joint Institute for Nuclear Research (JINR), Dubna, Russia is composed of a lead spallation target surrounded by a blanket of natural uranium. The resultant neutron spectrum is a combination of spallation and fission spectra, modified by a reflective...

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Published in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2012-02, Vol.664 (1), p.103-110
Main Authors: Borger, J.J., Hashemi-Nezhad, S.R., Alexiev, D., Brandt, R., Westmeier, W., Thomauske, B., Adam, J., Kadykov, M., Tiutiunnikov, S.
Format: Article
Language:English
Subjects:
Accelerator-driven Systems
Accelerators
Detectors
Deuteron-induced fission
Deuterons
Fission
MCNPX code
Monte Carlo methods
Neutron-induced fission
Nuclear fission
Proton-induced fission
Spallation
Spatial distribution
Thorium fission
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Summary:The Energy plus Transmutation (EpT) set-up of the Joint Institute for Nuclear Research (JINR), Dubna, Russia is composed of a lead spallation target surrounded by a blanket of natural uranium. The resultant neutron spectrum is a combination of spallation and fission spectra, modified by a reflective external layer of polyethylene and an internal absorbing layer of cadmium. The EpT set-up was irradiated with a beam of 4 GeV deuterons from the Nuclotron Accelerator at JINR. The spatial distribution of thorium fission rate within the assembly was determined experimentally, using a fission track detector technique, and compared with Monte Carlo predictions of the MCNPX code. Contributions of neutrons, protons, deuterons, photons and pions to total fission were taken into account. Close agreement between the experimental and calculated results was found. ► The thorium fission rate in a fast ADS neutron field was measured using mica track detectors. ► Experimental findings were compared with Monte Carlo predictions using the MCNPX code. ► The fission rate calculations included the Th(n,f), Th(p,f), Th(d,f) and Th( γ ,f) reactions. ► Close agreement between the experimental and calculated results was found.
ISSN:0168-9002
1872-9576
DOI:10.1016/j.nima.2011.10.027