用ARIANNA射电天文台阵首次搜寻宇宙成因中微子
A First Search for Cosmogenic Neutrinos with the ARIANNA Hexagonal Radio Array
摘要：
阿里安纳实验试图使用位于南极洲罗斯冰架表面的无线电探测器网格来观测10^8 - 10^10 GeV能量范围内的中微子扩散通量。探测器测量冰中中微子相互作用产生的带电粒子簇射在射频（约100 MHz至1 GHz）上产生的相干切伦科夫辐射。正在建造阿里安纳半球射电阵列（HRA），作为整个阵列的原型。在2013- 2014年夏季，HRA的三个台站收集了无线电数据，这些数据几乎实时地无线传输到场外。这些站的性能进行了描述，并提出了一个简单的分析，以寻找中微子信号。该分析采用了一组三个削减，拒绝背景触发，同时保留90%的模拟宇宙成因中微子触发。没有中微子候选人被发现的数据和模型无关的90%置信水平奈曼上限被放置在所有味中微子+反中微子通量在一个滑动的十年宽的能量仓。在10^8.5 - 10^9.5 GeV的能量区间内，极限达到最小值1.9x10^-23 GeV^-1 cm^-2 s^-1 sr^-1。还描述了全检测器的性能的模拟。完整的ARIANNA实验的灵敏度，并与目前的中微子通量模型进行比较。
英文摘要：
The ARIANNA experiment seeks to observe the diffuse flux of neutrinos in the 10^8 - 10^10 GeV energy range using a grid of radio detectors at the surface of the Ross Ice Shelf of Antarctica. The detector measures the coherent Cherenkov radiation produced at radio frequencies, from about 100 MHz to 1 GHz, by charged particle showers generated by neutrino interactions in the ice. The ARIANNA Hexagonal Radio Array (HRA) is being constructed as a prototype for the full array. During the 2013-14 austral summer, three HRA stations collected radio data which was wirelessly transmitted off site in nearly real-time. The performance of these stations is described and a simple analysis to search for neutrino signals is presented. The analysis employs a set of three cuts that reject background triggers while preserving 90% of simulated cosmogenic neutrino triggers. No neutrino candidates are found in the data and a model-independent 90% confidence level Neyman upper limit is placed on the all flavor neutrino+antineutrino flux in a sliding decade-wide energy bin. The limit reaches a minimum of 1.9x10^-23 GeV^-1 cm^-2 s^-1 sr^-1 in the 10^8.5 - 10^9.5 GeV energy bin. Simulations of the performance of the full detector are also described. The sensitivity of the full ARIANNA experiment is presented and compared with current neutrino flux models.
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