High resolution measurement of neutron inelastic scattering cross-sections for ²³Na

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• 作者：C. Rouki^a ; ^{haroularouki@gmail.com} ; P. Archier^b ; C. Borcea^c ; C. De Saint Jean^b ; J.C. Drohé ; ^a ; S. Kopecky^a ; A. Moens^a ; N. Nankov^a ; A. Negret^c ; G. Noguè ; re^b ; A.J.M. Plompen^a ; ^{arjan.plompen@ec.europa.eu} ; M. Stanoiu^a ; ^c
• 关键词：23Na ; Neutron inelastic cross-sections ; Level cross-sections ; Gamma ray production ; Sodium
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2012
• 出版时间：21 April 2012
• 年：2012
• 卷：672
• 期：Complete
• 页码：82-93
• 全文大小：1428 K

文摘

The neutron inelastic scattering cross-section of ²³Na has been measured in response to the relevant request of the OECD-NEA High Priority Request List, which requires a target uncertainty of 4 % in the energy range up to 1.35 MeV for the development of sodium-cooled fast reactors. The measurement was performed at the GELINA facility with the Gamma Array for Inelastic Neutron Scattering (GAINS), featuring eight high purity germanium detectors. The setup is installed at a 200 m flight path from the neutron source and provides high resolution measurements using the (n,n¡ä?-technique. The sample was an 80 mm diameter metallic sodium disk prepared at IRMM. Transitions up to the seventh excited state were observed and the differential gamma cross-sections at 110¡ã and 150¡ã were measured, showing mostly isotropic gamma emission. From these the gamma production, level and inelastic cross-sections were determined for neutron energies up to 3838.9 keV. The results agree well with the existing data and the evaluated nuclear data libraries in the low energies, and provide new experimental points in the little studied region above 2 MeV. Following a detailed review of the methodology used for the gamma efficiency calibrations and flux normalization of GAINS data, an estimated total uncertainty of 2.2 % was achieved for the inelastic cross-section integrals over the energy ranges 0.498-1.35 MeV and 1.35-2.23 MeV, meeting the required targets.