Research On Energy Calibration Method Of CsI(Tl) Scintillation Array Detector

With the rapid development of heavy ion accelerators and particle detectors,nuclear reaction experiments have been widely used in the study of nuclear structure and reaction mechanism,and more interesting experimental phenomena can be observed.However,the research on nuclear reactions is not comprehensive,and we need to continue to explore.In the nuclear experimental research,the calibration of the detector is an important part of data processing.The energy calibration has always attracted people's concern,and it directly determines the correctness of the experimental results.Through a large number of experimental studies on nuclear reactions,we found that there exist some problem not easily solved in the trational calibration methods,especially the energy calibration of Cs I(Tl)scintillation crystal array detectors.Due to the experimental results are easily affected by many factors,we found that many of the detector unit in large angles used in the experiment(64 in our experiment)failed to detect particles or detected particles in small statistics.This brings difficulties for subsequent data processing,that is,the energy calibration of the Cs I(Tl)crystal detector,the calculation of the deposition energy,and the reconstruction of the particle track.In addition,the energy calibration of the CsI(Tl)scintillation crystal array detector is very complicated.Unlike the energy calibration of the silicon detectors,the corresponding relatively simple linear relationship can be found.The light output of CsI(Tl)crystal is related to the atomic mass number A and nuclear charge number Z of the particle,which makes it more difficult to calibrate the Cs I(Tl)scintillation crystal detector.Therefore,the energy calibration of the Cs I(Tl)scintillation crystal array detector is the top priority of nuclear physics experiment data processing,no matter from the requirements of experimental data processing itself or the breakthrough of the calibration method.Therefore,it is urgent for us to find a new way to solve these problems.Through the above research,we found a new method to calibrate the energy of Cs I(Tl)scintillation crystal array detector to solve the above problems.This method can calibrate the energy of a Cs I(Tl)scintillation crystal array detector over a large angular arrangement.With this method,the acquired spectral spectra in all units in the array are normalized to the same scale.A central detector unit which can clearly distinguish all the measured nuclei with sufficient statistics,the energy loss-energy two-dimensional spectrum is chosen as the standard unit,and the energy calibration of all the measured nuclei can be performed.In this way,the corresponding particles can reach a certain statistical range and the calibration error can be reduced.And the calibrated coefficient of all the measured nuclei can be reasonably extended to all the detector units.This method solves the contradiction that the original large-angle detection unit cannot perform the energy calibration because of the small statistics.This method provides the possibility of large angular distribution measurements,particle track reconstruction,and correlation events selection in nuclear reaction studies.Therefore,the experimental data can be effectively used,and the problem that energy of CsI(Tl)scintillation detection unitl at large angle cannot be calibrated due to insufficient statistics can be solved,which is very useful to the energy calibration of the following similar experiments and provides important practical significance.