Different Design Schemes On The Measurement Of Low Energy Solar Neutrino Rates

Neutrinos are one of the few distinct probes we have to observe the large-scale features of the world around us.Together with photons,some charged leptons,and quarks,they are the only fundamental particles with large enough a range to travel from distant objects to reach us.In contrast with any of the other particles,they are the only ones bound by the weak interaction force alone.Being the only known particle with such properties,they can be used as an extraordinarily versatile tool to observe and understand Nature.It is also a new field since it was not a long time when human study on them,and it is just the beginning for us to understand them.this paper give an overview of the history of neutrino physic,first,outline the obser-vation and detection of neutrino,describe the relationship between the detection of solar neutrino and the observation of neutrino oscillation.Then,we introduce the theory of neutrino oscillation,which include the Standard Model Lagrangian of electroweak inter-action,the Higgs mechanism which endows elements particle with mass,extend Standard Model to give neutrino mass and then the theory formalism of neutrino oscillation.Finally we give a short explanation to different detection method of solar neutrino experiments,which liquid scintillator will gain the real time information of solar neutrino,and results of solar neutrino experiments,respectively.In order to consult future experiments,we use numerical simulation to analyze the measurement of 7Be solar neutrino rates under different experimental schemes.A detailed calculation shows that,the error of measurement can be controlled within 0.4 percent,if the purity of liquid scintillator is improved to 2 times,the detector resolution is improved to 1.7 times and the total experiment error is reduced to half comparing to the Borexino-I experiment.Finally,we perform a traditional least-squares analysis based on all data sets from neutrino oscillation experiments' and show the best-fit point and different allowed regions in oscillation parameter space.We find that,the recent data sets have brought stricter constraints on the allowed regions.the data from Borexino and KamLAND give a new update in sin 2?12 and ?m122.Daya Bay and RENO data give a good constraint in sin 2?13 and ?m132· After a global analysis in three flavor oscillation,solar neutrino oscillation parameters sin 2?12,?m122 and sin 2?13 are determined with a very high precision.