Abstract
This paper presents a digital neutron spectrometer based on simultaneous digitizing of the signals from the fission chamber and a scintillation detector. The scintillation detector is based on stilbene crystal. The intrinsic detection efficiency of the used stilbene crystal and the energy dependence of the light output for the recoil protons were measured. It is shown, that the method allowed us to achieve time resolution of 1.5 ns and an good n/γ separation down to neutron energies of 400 keV.
Highlights
Prompt neutron spectra are very important for criticality calculations of nuclear reactors
This paper presents a spectrometer based on simultaneous digitizing the signal from the fission chamber and a scintillation detector
Digital neutron spectrometer based on the stilbene crystal, the parallel plate ionization chamber and the waveform digitizer was developed
Summary
Prompt neutron spectra are very important for criticality calculations of nuclear reactors. The most accurate method for measuring the neutron spectra is the time-of- flight method. Organic scintillators are the most frequently used as a neutron detector. They have considerable sensitivity to gamma rays accompanying fission process. An important advantage of digital signal processing is the possibility to analyze the pulse shape in detail This makes it possible to optimize the background conditions, significantly improve a time resolution and achieve a higher peak load [1, 2]. A correlation analysis method was used for the processing of digitized signals It is shown, that the method allows achieving the time resolution about 1.5 ns and the good n/γ separation down to neutron energies of 400 keV
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