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Etude de la mesure de la section efficace de la réaction 16O(n,alpha)¹³C du seuil à 10 MeV

Abstract : SCALP (Scintillating ionization Chamber for ALpha particle production in neutron induced reactions) is an experimental device conceived to measure the cross section of the n-induced reaction on oxygène O-16(n,alpha)C-13. This latter reaction belongs to the HPRL (High Priority Request List) NEA list and is relevant in reactor physics because of the helium production affecting important fast and thermal neutron reactor's parameters.The Monte Carlo simulations with Geant4 showed that the device (a scintillating ionization chamber surrounded by four photomultipliers tubes) can measure and discriminate the different reactions inside the scintillating ion chamber. Cross section of O-16(n,alpha)C-13 and F-19(n,alpha)N-16 (used for cross section normalisation) reactions between the energy threshold and 10MeV could be experimentally measured with a 15% relative accuracy. However some improvement will be necessary to obtain lower uncertainties as requested by the NEA : O-16(n,alpha)C-13 cross section measurement with a accuracy better than 10%.
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Submitted on : Monday, January 22, 2018 - 2:53:29 PM
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  • HAL Id : tel-01689841, version 1


Bastien Galhaut. Etude de la mesure de la section efficace de la réaction 16O(n,alpha)¹³C du seuil à 10 MeV. Physique [physics]. Normandie Université, 2017. Français. ⟨NNT : 2017NORMC231⟩. ⟨tel-01689841⟩



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