| Explore the limit of nuclear mass number,study the decay mode and nuclear structure of superheavy nucleus,and synthesize new nuclides are the important frontier fields of nuclear physics.The gas-filled recoil separator(SHANS)at the Institute of Modern Physics,Chinese Academy of Sciences is an important experimental device for synthesing neutron-deficient actinide new nuclides and studying the α decay properties of heavy nuclides in China.In order to further improve the detective efficiency of the focal plane detector array for heavy nuclide α decay particles and γ rays,we plan to upgrade the existing detector device.The main work of this paper includes:(1)The efficiency of the detector array in the focal plane of the existing gas-filled recoil separator is simulated by using the GEANT4 software based on Monte Carlo method,and the simulation results are compared with the experimental data.The simulation results well reproduce the experimental data and verify the accuracy of the program.(2)Based on the simulation of the detector array of the existing separator,the theoretical model of focal plane detector system will be upgraded on the SHANS separator was carried out,and the detective efficiency of α particles and γ rays was simulated.The results show that: the detective efficiency of the new detector system for α-decay particles is up to about 88 %,the maximum detective efficiency is about 22 % for γ rays at 100 ke V,the detective efficiency of full-energy peak for the γ rays at 1 Me V is about 7 %.Compared with the original detection system,it is significantly improved.The results of theoretical simulation can provide a reference for the optimization design of the new detector system. |
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