Study Of The Simulation Of Reactor Neutrino Experiment

The mixing and transformation of neutrino flavor are major research directions in the field of particle physics.They are directly related to the extension of the Standard Model of elementary particles,and also related closely to many problems such as the origin of particle mass,the essence of flavor physics,the leptogenesis mechanism,the asymmetry of matter and anti-matter in the universe,and the flavor mixing of quarks.It is a very important and urgent task to accurately study the flavor transformation phenomenon of neutrino and the mixing mechanism behind it.Based on the latest experimental data given by DAYA Bay,RENO and Kam LAND reactor neutrino experiments,this thesis studies the neutrino oscillation parameters and the existing neutrino mixing models.The main work is as follows:1、Numerical simulation of the main reactor neutrino experiments around the world is performed,and the neutrino oscillation parameters related to the reactor neutrino with the latest data are analyzed.The production,propagation,and detection of reactor neutrinos are simulated using Fortran language programming.By comparing the simulation results and the experimental data,the 1σ,2σ,3σconfidence intervals of the relevant oscillation parameters limited by the experiments are obtained by using the Chi-square analysis method.2、The various reactor neutrino experiment data are jointly analyzed,and the different confidence levels in the plane of 12-13 mixed angles are obtained.On this basis,the oscillation parameters predicted by some neutrino flavor mixing models are tested,and the range of parameters in the mixing models is given.Among them,the best-fit point of the joint analysis is sin²?₁₂=0.310,sin²?₁₃=0.0217,and the 3σconfidence interval is sin²?₁₂∈0.062,0.420,sin²?₁₃∈0.0188,0.0246.The allowed ranges of adjustable parameters are 0.39,0.44 or-0.44,-0.39 for the A₄model,and 0.342,0.387 for the S₄model.