Abstract

This paper describes a new coincidence experiment designed to improve understanding of the composition of the primary cosmic-ray beam around the knee of the spectrum. The experiment consists of an air shower array on the surface (SPASE-2), which works in coincidence with an array of air-Cherenkov detectors (VULCAN), and the Antarctic Muon and Neutrino Detector Array (AMANDA) deep in the ice. The experiment must cover the energy range from ∼10 14 to ∼3×10 16 eV to overlap with direct measurements at lower energy and encompass the regions of the knee and beyond in the cosmic ray spectrum.

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