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Development of a detector for the simultaneous measurement and for the study of uranium-233 capture and fission yields at the CERN n_TOF neutron source

Abstract : A low-carbon energy outlook to mitigate the climate change requires the replacement of fossil fuel by sources with low CO2 emissions, like nuclear energy.. One of the options discussed in the Gen-IV International Forum for the the next generation of nuclear reactors is to use the thorium cycle. The fissile isotope 233U is among the most important isotopes in the thorium cycle and directly responsible for the neutron economy. One of the particularities of this nucleus is to have a capture cross section which is one order of magnitude lower than fission, making the measurement of the 233U capture cross section very challenging as indicated by only two high resolution data sets available since the 1960s. In this thesis, a new measurement at the n_TOF neutron source is described employing a novel compact fission chamber inserted in the center of the Total Absorption Calorimeter g-ray detector. The fission chamber allows to tag and subsequently subtract the gamma rays from the fission reaction aiming to improve the accuracy of the 233U capture cross section.The performance of the custom tailored fission chamber is described in detail and allows to extract information about the prompt fission g-rays. A detailed discussion of the data reduction process and the key elements in the analysis is given resulting in the calculation of the 233U-alpha-ratio, the ratio between the capture and fission cross-section.
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https://tel.archives-ouvertes.fr/tel-02358659
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Submitted on : Tuesday, November 12, 2019 - 9:28:22 AM
Last modification on : Friday, May 29, 2020 - 3:54:37 AM
Long-term archiving on: : Thursday, February 13, 2020 - 4:06:29 PM

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  • HAL Id : tel-02358659, version 1

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Michael Bacak. Development of a detector for the simultaneous measurement and for the study of uranium-233 capture and fission yields at the CERN n_TOF neutron source. Nuclear Experiment [nucl-ex]. Université Paris-Saclay; Technische Universität (Vienne), 2019. English. ⟨NNT : 2019SACLS313⟩. ⟨tel-02358659⟩

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