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arXiv 2107.08692astro-ph.HEphysics.optics
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解释IceCube冰各向异性的一种新的基于微结构的模型

A Novel Microstructure-Based Model to Explain the IceCube Ice Anisotropy

Martin Rongen, Dmitry Chirkin

摘要:

冰立方中微子天文台在南极约1公里深的冰川冰层上使用5160光电倍增管探测$^3$,以检测带电相对论粒子的切伦科夫光。冰立方的大部分科学目标在很大程度上依赖于对仪器冰的光学特性的更精确的理解。实验观察到的一个奇怪的光传播效应是各向异性衰减,它与冰的局部流动一致。最近确定弯曲的光子轨迹所造成的不对称光扩散的双折射多晶微结构的冰作为最有可能的根本原因,这种影响,工作正在进行中,以优化模型参数(有效地推导出平均晶体的大小和形状的检测器)。我们提出了我们的光子传输模拟的双折射效应的参数化,拟合的过程和结果,以及新的冰模型对数据MC协议的影响。

英文摘要:

The IceCube Neutrino Observatory instruments about 1 km$^3$ of deep, glacial ice at the geographic South Pole using 5160 photomultipliers to detect Cherenkov light of charged relativistic particles. Most of IceCube's science goals rely heavily on an ever more precise understanding of the optical properties of the instrumented ice. A curious light propagation effect observed by the experiment is an anisotropic attenuation, which is aligned with the local flow of the ice. Having recently identified curved photon trajectories resulting from asymmetric light diffusion in the birefringent polycrystalline microstructure of the ice as the most likely underlying cause of this effect, work is now ongoing to optimize the model parameters (effectively deducing the average crystal size and shape in the detector). We present the parametrization of the birefringence effect in our photon propagation simulation, the fitting procedures and results as well as the impact of the new ice model on data-MC agreement.

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