期刊
ASTROPARTICLE PHYSICS
卷 108, 期 -, 页码 63-73出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.astropartphys.2019.01.004
关键词
Glaciology; Neutrinos; Radio-frequency
资金
- National Science Foundation [NSF OPP-1002483, NSF OPP-1359535, 0847658, 1250720, DGE-1343012, 1255557]
- Taiwan National Science Councils Vanguard Program [NSC 102-2628-M-002-010]
- Belgian F.R.S.-FNRS Grant [4.4508.01]
- University of Wisconsin Alumni Research Foundation
- University of Maryland
- Ohio State University
- United States-Israel Binational Science Foundation [2012077]
- National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) [14.A12.31.0006]
- Leverhulme Trust
- STFC [PP/E006876/1, ST/N000285/1] Funding Source: UKRI
- Div Of Information & Intelligent Systems
- Direct For Computer & Info Scie & Enginr [1250720] Funding Source: National Science Foundation
Owing to their small interaction cross-section, neutrinos are unparalleled astronomical tracers. Ultra-high energy (UHE; E> 10 PeV) neutrinos probe the most distant, most explosive sources in the Universe, often obscured to optical telescopes. Radio-frequency (RF) detection of Askaryan radiation in cold polar ice is currently regarded as the best experimental measurement technique for UHE neutrinos, provided the RF properties of the ice target can be well-understood. To that end, the Askaryan Radio Array (ARA) experiment at the South Pole has used long-baseline RF propagation to extract information on the index-of-refraction (n = root epsilon(r)) in South Polar ice. Owing to the increasing ice density over the upper 150-200 m, rays are measured along two, nearly parallel paths, one of which refracts through an inflection point, with differences in both arrival time and arrival angle that can be used to constrain the neutrino properties. We also observe (first) indications for RF ice birefringence for signals propagating along predominantly horizontal trajectories, corresponding to an asymmetry of order 0.1% between the ordinary and extraordinary birefringent axes, numerically compatible with previous measurements of birefringent asymmetries for vertically-propagating radio-frequency signals at South Pole. Qualitatively, these effects offer the possibility of redundantly measuring the range from receiver to a neutrino interaction in Antarctic ice, if receiver antennas are deployed at shallow (z similar to -25 m) depths. Such range information is essential in determining both the neutrino energy, as well as the incident neutrino direction. (C) 2019 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据