Abstract
Radiative neutron capture cross sections are very important in the field of basic physics research and nuclear device R&D. The Back-n white neutron beam line of China Spallation Neutron Source (CSNS) is the first spallation neutron beam line in China. On the purpose for radiative neutron capture cross section measurement, a C6D6detector system was built in the Back-n experimental station. The pulse height weighting technique (PHWT) was used to make the system’s detective efficiency independent of the cascade path and the energy of cascade gamma rays. The neutron energy spectrum was measured for the energy between 1eV and 80keV with a6Li loaded ZnS scintillation detector. Besides, a testing experiment with197Au and169Tm samples was carried out to examine this system. According to the preliminary results, this C6D6detector system can be used to perform neutron capture cross section measurement.
Highlights
Introduction of aC6D6 detector system on the Back-n of China Spallation Neutron Source (CSNS)Jie Ren1,*, Xichao Ruan1, Jie Bao1, Guangyuan Luan1, Hanxiong Huang1, Yangbo Nie1 AbstractRadiative neutron capture cross sections are very important in the field of basic physics research and nuclear device R&D
A lot of accurate σnγ of important nuclides were measured based on the white neutron source facilities, such as the CERN n-time of flight (TOF), GELINA, LANSCE and so on [2,3,4]
The neutron spectrum measured by multi-layer fission chamber (MFC) is not sufficiently accurate for this energy region between 1 ENDF BVIII.0 (eV) and 20 keV. 235U used as neutron converter in the MFC has lots of resonances in this region, and the fission cross section of 235U in the resonance region is not a standard cross section
Summary
Radiative neutron capture cross-section (σnγ) is one of the very important nuclear data in the field of the R&D of Accelerator Driven Systems (ADS), the transmutation of nuclear waste [1] and Nuclear Astrophysics. A lot of accurate σnγ of important nuclides were measured based on the white neutron source facilities, such as the CERN n-TOF, GELINA, LANSCE and so on [2,3,4]. The C6D6 liquid scintillation detectors [6] are widely used for σnγ measurements on time-of-flight facilities, because of its low neutron sensitivity and good time response. The main purpose of this system is to perform σnγ measurement, especially in the resonance energy region
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