Matter effects and coherent effect of neutrinos produced from γ-ray bursts  

作　　者：Kuan Liu Chun-Sheng An Xin Li Hai-Nan Lin 刘宽;安春生;李昕;林海南(School of Physical Science and Technology,Southwest University,Chongqing 400715,China;Department of Physics,Chongqing University,Chongqing 401331,China)

机构地区：[1]School of Physical Science and Technology,Southwest University,Chongqing 400715,China [2]Department of Physics,Chongqing University,Chongqing 401331,China

出　　处：《Chinese Physics C》2019年第10期99-104,共6页中国物理C（英文版）

基　　金：Supported in part by the Natural Science Foundation of China(11675131,11775038,11603005,11847301);the Fundamental Research Funds for the Central Universities(2019CDJDWL0005)

摘　　要：Neutrinos produced from γ-ray bursts (GRBs) carry significant physical information. The electron density in the GRBs outflow is very large. In this study, we calculate the matter effect on neutrinos when they propagate through such a dense region. The average survival probability and the flavor ratio of neutrinos are determined. The ratio of resonant neutrino energy from different spherical shells provides the information of power index N for the power-law distribution of electrons in the hot fireball model. Electron density in the magnetic jet model is sufficiently lower than in the hot fireball model. The matter effect on neutrinos can be used to distinguish these two models. The coherent effect of strongly lensed PeV neutrinos is also discussed. The average survival probability of strongly-lensed electron neutrinos in the normal and inverted hierarchical cases are presented. The results show that this coherent effect can be used to determine the hierarchical mass of neutrinos.Neutrinos produced from γ-ray bursts(GRBs) carry significant physical information. The electron density in the GRBs outflow is very large. In this study, we calculate the matter effect on neutrinos when they propagate through such a dense region. The average survival probability and the flavor ratio of neutrinos are determined. The ratio of resonant neutrino energy from different spherical shells provides the information of power index N for the power-law distribution of electrons in the hot fireball model. Electron density in the magnetic jet model is sufficiently lower than in the hot fireball model. The matter effect on neutrinos can be used to distinguish these two models. The coherent effect of strongly lensed PeV neutrinos is also discussed. The average survival probability of strongly-lensed electron neutrinos in the normal and inverted hierarchical cases are presented. The results show that this coherent effect can be used to determine the hierarchical mass of neutrinos.

关 键 词：NEUTRINO oscillations Γ-RAY BURSTS GRAVITATIONAL LENSING 

分 类 号：O571.323[理学—粒子物理与原子核物理] O572.3[理学—物理]