The Experimental Research Of The Energy Calibration For Dayabay Neutrino Detector

In the Dayabay neutrino experiment,China Institute of Atomic Energy(CIAE) that is one of the Dayabay neutrino experiment collaboration is taking charge two works that are the proton light output determination of GdLS detector and the radiate sources making for energy calibration of GdLS.My task was measuring the light output function of GdLS and the energy spectrum of a PuC source which will be used in Dayabay experiment.The light output function measurement was performed in the laboratory of HI-13 tandem accelerator,using a fast Neutron Time of Flight(NTOF) spectrometer.Two gamma source was used for energy calibration.The energy region of neutron source which was produced with nuclear reaction of deuteron and beryllium was 1 to 14 MeV. CAMAC was used to be data acquire system.Monte-Carlo and iterative methods are used in the data analysis to get proton light output response function.With the proton light output function,the parameter kB in a half-experience light output formula was determined.The carbon and alpha light output response function can be confirm using the half-experience formula after the kB value was determined.This kB value was also used as a input parameter in Geant3 code to simulate the energy loss of each particles in detector.PuC neutron sources are widely used in many nuclear experiments.The 6.13 MeV gammas produced by a PuC source represent a very good high energy gamma source for energy and efficiency calibration.For the Dayabay neutrino experiment,a PuC source has been proposed to calibrate the neutrino detectors with its 6.13 MeV gammas and neutrons.In addition,the PuC source also can provide other five energy points in the energy region of 1-8 MeV.This is very good for the study of the nonlinearity,energy resolution and stability of the neutrino detectors.The neutron energy spectrum of the source should be known in order to analyze the calibration data with detailed Monte Carlo(M-C) simulations.However,there are very few neutron energy spectrum measurements for a PuC source that have been reported in the literature,and the neutron energy spectra from different PuC sources are different due to the differences in the manufacturing procedure,sealing geometry and sealing materials.Therefore it is necessary to measure the neutron energy spectrum of our own PuC source to facilitate the calibration requirements of the Dayabay neutrino experiment.The principles of the technique to unfold a neutron energy spectrum by using the measured neutron response function and the measured pulse height(PH) spectrum is briefly described.The PH spectrum of neutrons from the PuC source, which will be used for the calibration of the reactor antineutrino detectors for the Dayabay neutrino experiment,was measured and analyzed to get the neutron energy spectrum.Simultaneously the neutron energy spectrum of a Am-Be source was measured and compared other measurements as a check of the result for the PuC source.Finally,the error analysis and a discussion of the results are given.This work contains two parts.First,a whilt neutron energies from 1-14 MeV produced by the D-Be reaction at the HI-13 tandem accelerator at the CIAE were used to determine the response function of GdLS neutrino detector.Second,the PH spectrum of neutrons from the PuC source was measured using the calibrated BC501A neutron detector,and then the measured PH spectrum was unfolded by the SAND-II unfolding method using the known neutron response matrix,to get the neutron energy spectrum of the PuC source.