Grand, A Giant Radio Array For Neutrino Detection: Objectives, Design And Current Status
Grand, A Giant Radio Array For Neutrino Detection: Objectives, Design And Current Status
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DOI：
10.1051/epjconf/201921601006
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发表时间：
2019-06
影响因子：
--
通讯作者：
M. Tueros
中科院分区：
文献类型：
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作者：
M. Tueros
中微子探测巨型射电阵列（GRAND）旨在回答天体物理学中最紧迫的开放性问题之一：超高能宇宙射线（UHECR）的起源是什么？它将间接地这样做：UHECR产生次级UHE中微子，这些中微子编码了有关UHECR特性及其来源的信息。GRAND被设计用来发现UHE中微子，即使在对它们的通量的悲观预测下，在109 GeV附近达到6x 10 −9GeV.cm−2.s−1.sr−1的灵敏度。它将通过使用20个子阵列的10 000个无线电天线，形成总探测器面积为200 000平方公里，使其成为有史以来最大的空气簇射探测器。凭借这种灵敏度，GRAND将在3年的运行中发现宇宙成因中微子，即使在不利的情况下。由于它的亚度角分辨率，GRAND还将寻找UHE中微子的点源，包括稳定的和瞬态的。此外，GRAND将成为天文学和宇宙学的宝贵仪器，可以发现和跟踪大量的无线电瞬变-快速射电暴、巨型射电脉冲-以及研究再电离时代。在这篇文章中，我们将简要介绍一些科学目标，检测策略，建设计划和GRAND项目的现状。
The Giant Radio Array for Neutrino Detection (GRAND) aims to answer one of the most pressing open questions in astrophysics: what is the origin of ultra-highenergy cosmic rays (UHECRs)?. It will do so indirectly: UHECRs make secondary UHE neutrinos which encode information about the properties of UHECRs and their sources. GRAND is designed to discover UHE neutrinos even under pessimistic predictions of their flux, reaching a sensitivity of 6x10−9GeV.cm−2.s−1.sr−1 around 109GeV. It will do so by using 20 sub-arrays of 10 000 radio antennas forming a total detector area of 200 000 km2, making it the largest air-shower detector ever built. With this sensitivity, GRAND will discover cosmogenic neutrinos in 3 years of operation, even in disfavorable scenarios. Because of its subdegree angular resolution, GRAND will also search for point sources of UHE neutrinos, both steady and transient. Moreover, GRAND will be a valuable instrument for astronomy and cosmology, allowing for the discovery and followup of large numbers of radio transients - fast radio bursts, giant radio pulses - and studies of the epoch of reionization. In this contribution we will present briefly some of the science goals, detection strategy, construction plans and current status of the GRAND project.