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HAWC is an air-shower detector designed to study TeV gamma and cosmic rays.The observatory is composed of a $22000 \, m^2$ array of $300$ water Cherenkovtanks ($4.5 \, m$ deep x $7.3 \, m$ diameter) with $4$ photomultipliers (PMT)each. The instrument registers the number of hit PMTs, the timing informationand the total charge at the PMTs during the event. From these data, showerobservables such as the arrival direction, the core position at ground, thelateral age and the primary energy are estimated. In this work, we study thedistribution of the shower age vs the primary energy of a sample of shower datacollected by HAWC from June 2015 to June 2019 and employ a shower-age cut basedon predictions of QGSJET-II-04 to separate a subsample of events dominated by Hand He primaries. Using these data and a dedicated analysis, we reconstruct thecosmic ray spectrum of H+He from $6$ to $158$ TeV, which shows the presence ofa softening at around $24$ TeV with a statistical significance of $4.1\sigma$.

A measurement of the proton plus helium spectrum of cosmic rays in the TeV region with HAWC