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The energy-dependent abundance of elements in cosmic rays plays an importantrole in understanding their acceleration and propagation. Most current resultsare obtained either from direct measurements by balloon- or satellite-bornedetectors, or from indirect measurements by air shower detector arrays on theEarth's surface. Imaging Atmospheric Cherenkov Telescopes (IACTs), usedprimarily for $\gamma$-ray astronomy, can also be used for cosmic-ray physics.They are able to measure Cherenkov light emitted both by heavy nuclei and bysecondary particles produced in air showers, and are thus sensitive to thecharge and energy of cosmic ray particles with energies of tens to hundreds ofTeV. A template-based method, which can be used to reconstruct the charge andenergy of primary particles simultaneously from images taken by IACTs, will beintroduced. Heavy nuclei, such as iron, can be separated from lighter cosmicrays with this method, and thus the abundance and spectrum of these nuclei canbe measured in the range of tens to hundreds of TeV.

A template method for measuring the iron spectrum in cosmic rays with Cherenkov telescopes