Analysis Of Earth Neutrino Flux Based On Jiangmen Underground Neutrino Experiment

Geo-neutrinos are anti-neutrinos from the process of U,Th,and K decays inside the Earth.Due to extremely small cross section,they are unique in that they can escape freely and instantaneously from Earth's interior and arrive Earth's surface.Its research become a new approach for the study of the composition and structure of the interior of the Earth.Before this,the KamLAND and Borexino experimental group have published the detection results of the geo-neutrinos.Both detection results show that probing the geo-neutrinos is feasible.We can't distinguish the signal from the mantle and crust,as the limitation is that the liquid scintillation detector volume is too small.Simultaneously we also can't distinguish different mantle models.The liquid scintillation detector volume of Jiangmen Underground Neutrino Observatory(JUNO)reached 20,000 tons.We may achieve this goal after the detector is fully operational.Therefore,excepting flux of the geo-neutrinos at JUNO is very significantly.On the one hand,we except the flux of geo-neutrinos based on the three-dimensional global models,including geophysics and geochemistry models.In this study,three global models,CRUST2.0,CRUST1.0 and LITHO1.0,were used to calculate flux of the go-neutrinos at JUNO.And we compared three corresponding results.Meanwhile,we also use the data of Chinese geological model to complete the accurate calculation of the flux of geo-neutrinos in the local area around JUNO.The results are also compared with the CRUST1.0 model's estimation.The crustal thickness and the density of the rock are different,which makes the difference of the geo-neutrinos signal at JUNO predicted by different geophysical models.The contribution from the upper crust and sedimentary layer exceeds 68%.More than 66%of geo-neutrinos signal is produced within 5° × 5° area around JUNO.On the other hand,it is concluded that the effects of abundance of radioactive element,crustal density and crustal thickness on geo-neutrinos flux around JUNO decrease gradually.Meanwhile,the abundance of rock samples within 100 km around the detector was also collected and measured.Three abundance models were established using the measured abundance.The predicted geo-neutrinos signal results are 1.73,1.84,and 1.56 times larger than the global average abundance model,respectively.It provides guidance for establishing a precise local three-dimensional earth model and improves the calculation accuracy of crustal geo-neutrinos.