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Tuning in on the cosmic rays of the highest energy - searching for GZK-neutrinos with ARIANNA

调谐最高能量的宇宙射线 - 与 ARIANNA 一起寻找 GZK 中微子

基本信息

批准号：
272251164
负责人：
Professorin Dr. Anna Nelles
金额：
--
依托单位：
Department of Physics and Astronomy
依托单位国家：
德国
项目类别：
Research Fellowships
财政年份：
2015
资助国家：
德国
起止时间：
2014-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/272251164?language=en
关键词：
Tuning cosmic rays highest energy

项目摘要

The sources of ultra-high energy cosmic rays, the particles of the highest energy currently known, have been elusive. The search is not straight forward, as the charged particles are deflected by Galactic and Intergalactic magnetic fields on their way from an astronomical source before detection on Earth. Also, their flux is extremely low. At the high-energy end of the flux spectrum a cut-off is observed that is associated with an interaction of the cosmic rays with the cosmic microwave background; the GZK-effect. In this interaction neutrinos are created, the GZK-neutrinos. As these travel in straight lines, they will point back to the elusive sources.Since the probability of detecting neutrinos is very low, large detector volumes are needed. Here, the usage of radio emission in ice is a promising method. This method allows one to instrument large areas at low costs that are able to detect the faint radio signal that a neutrino interacting in the large ice volume of Antarctica will generate.The researcher proposes to join the ARIANNA experiment that will exploit the potential of low-cost antenna arrays to detect GZK-neutrinos. She will play a key-role in the design and implementation of the data-analysis tools and contribute in a knowledge transfer about low-power consumption, fast microwave electronics and autonomous power generation for detector stations.The detection (or non-detection) of GZK-neutrinos will significantly influence the current understanding of cosmic ray acceleration.

超高能宇宙射线是目前已知能量最高的粒子，其来源一直难以捉摸。搜索并不是一帆风顺的，因为在探测到地球之前，带电粒子在从天文来源出发的途中会被银河系和银河系间的磁场偏转。此外，它们的通量极低。在通量谱的高能端，观测到了与宇宙射线与宇宙微波背景的相互作用有关的截止点；GZK效应。在这种相互作用中产生了中微子，即GZK-中微子。当这些中微子沿着直线行进时，它们将指向难以捉摸的来源。由于探测到中微子的概率非常低，因此需要更大的探测器体积。在这里，在冰中使用无线电发射是一种很有前途的方法。这种方法使人们能够以低成本测量大面积的仪器，能够探测到在南极洲大冰层中相互作用的中微子将产生的微弱无线电信号。研究人员提议加入阿里安娜实验，该实验将利用低成本天线阵列的潜力来探测GZK中微子。她将在数据分析工具的设计和实施中发挥关键作用，并在低功耗、快速微波电子学和探测器站自主发电方面的知识转移方面做出贡献。GZK中微子的探测(或未探测到)将显著影响目前对宇宙线加速的理解。