Some Studies On GEANT4 Simulation For Neutrino Detection Method And Detection Efficiency Problem

The neutrino physics is a most active branch of the current particle physics, as it has many unsolved mysteries. Since the hypothesis of the neutrino physics is proposed, the experiment of the neutrino physics detection and characters have never break off. By far, neutrino is the first and the only particle to breakthrough standard physics models. Solving the problem of neutrino has great science significance, and maybe become the foundation to breakthrough standard physics models. As to detect neutrino, primarily use the absorption reaction (ve+Pâ†' e+ +n) of the enormous anti-electron neutrino which produced by neutrino source nuclear reactor through the liquid scintillation counter, and release electrons and neutrons. The absorption reaction form two signals of different speed in the liquid scintillation counter, and the delayed union signal formed by the two signals is the character of the neutrino, then achieve the purpose to detect neutrino.The main purpose of this paper is to use the simulation of the Genat4 Monte Carlo to research the detect efficiency problem of the characteristic signal of electrons and neutrinos from the atomic rector. As the key to use the liquid scintillation counter to detect neutrino signal is the two delay combination signals, so the detect efficiency of the liquid scintillation counter has a direct influence of the detect efficiency of the neutrino.In this paper, we use the Genat4 Monte Carlo approaches which simulating the detect efficiency of the liquid scintillation counter by number of (detect laye r& absorb layer) layers, thickness, the energy of the neutrino, and mixing with different neutron absorb material to study the optimization problem of detect efficiency. The simulation result showed that the detect efficiency of positive electron is none the business with the number of layers and neutron absorb material, all those detect efficiency approach to 100%, so the key of the liquid scintillation counter detect efficiency focus on the detect of the neutron signal. The simulation result shows that when the liquid scintillation counter has a layers of 120, the thickness of the absorb layer is 0.01mm. the neutron energy is lOMev which in the energy state scope, the detect efficiency reach it’s peak value above 80%.Though the simulation of the delay coincidence measure method in Geant 4 is not given, but we will provide neutron inelastic reflection time, capture time of various material and the response time of positron pairs, make preparations for the research of the following steps.