In the past, due to the technological limitations of direct and indirect cosmic ray detectors, the observations made on the energy interval from 10 TeV to 1 PeV of the all-particle cosmic-ray energy spectrum have poor statistics and are dominated by large systematics errors. The High Altitude Water Cherenkov (HAWC) observatory, is a new generation air shower detector built with the aim of monitoring the sky in search for gamma rays (E = 100 GeV - 100 TeV) and cosmic rays (from 100 GeV up to 1 PeV). The detector consists of an array of 300 water Cherenkov detectors that covers 62% of a flat surface of 22,000 $m^2$, is instrumented with 1,200 photomultipliers (PMTs) in close-packed water Cherenkov tanks containing a total of 60 ML of water, and it is located at 4100 m a.s.l. at the Pico de Orizaba Volcano in Puebla, Mexico. Due to its design and its high altitude, HAWC can provide high statistic measurements of the all-particle energy spectrum of TeV cosmic rays. In this work, we show preliminary results on the total spectrum of cosmic rays between 10 TeV and 1 PeV obtained from two years of HAWC's data using an analysis based on a Bayesian unfolding technique.

Oral