Introduction of a C6D6 detector system on the Back-n of CSNS

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 C6 D6 detector 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 a 6 Li loaded ZnS scintillation detector. Besides, a testing experiment with 197 Au and 169 Tm samples was carried out to examine this system. According to the preliminary results, this C6 D6 detector system can be used to perform neutron capture cross section measurement.