An optimized C₆D₆ detector for studies of resonance-dominated (n,γ) cross-sections

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• 作者：Plag ; R. ; Heil ; M. ; K&auml ; ppeler ; F. ; Pavlopoulos ; P. ; Reifarth ; R. ; Wisshak ; K.
• 关键词：25.40.Lw ; 25.40.Ny ; 28.20.&minus ; v ; 29.40.Mc ; C₆D₆ scintillators ; Neutron sensitivity ; Monte Carlo simulations ; Neutron time-of-flight spectroscopy ; Neutron capture resonances
• 刊名：Nuclear Instruments and Methods in Physics Research Section A ; Accelerators ; Spectrometers ; Detectors and Associated Equipment
• 出版年：2003
• 期刊代码：41_01689002
• 类别：ph
• 出版时间：January 11, 2003
• 卷：496
• 期：2-3
• 页码：425-436
• 文件大小：269 K

摘要

Hydrogen-free scintillators are indispensable for determining the small, resonance-dominated neutron capture cross-sections of light and neutron magic nuclei, data which are needed for advanced reactor concepts, for transmutation of radioactive wastes as well as for astrophysical scenarios of neutron capture nucleosynthesis. A critical comparison of the existing detector concepts by means of detailed GEANT simulations revealed large differences in neutron sensitivity. Based on these simulations, an optimized detector was developed and successfully tested. Compared to a commercial detector, the neutron sensitivity of this solution is more than an order of magnitude lower, thus allowing even extremely small capture/scattering ratios to be measured reliably.