![]() These charged leptons can, if they are energetic enough, emit Cherenkov radiation. When they do react with the molecules of water in the ice, they can create charged leptons ( electrons, muons, or taus). Neutrinos are electrically neutral leptons, and interact very rarely with matter. A vision has been presented for a larger observatory, IceCube-Gen2. PINGU (Precision IceCube Next Generation Upgrade) is a proposed extension that will allow detection of low energy neutrinos (GeV energy scale), with uses including determining the neutrino mass hierarchy, precision measurement of atmospheric neutrino oscillation (both tau neutrino appearance and muon neutrino disappearance), and searching for WIMP annihilation in the Sun. There are no Deep Core DOMs between 1850 m and 2107 m depth, as the ice is not as clear in those layers. The Deep Core strings are deployed at the center (in the surface plane) of the larger array, deep in the clearest ice at the bottom of the array (between 17 m deep).
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