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A measurement with high statistics of the differential energy spectrum oflight elements in cosmic rays, in particular, of primary H plus He nuclei, isreported. The spectrum is presented in the energy range from $6$ to $158$ TeVper nucleus. Data was collected with the High Altitude Water Cherenkov (HAWC)Observatory between June 2015 and June 2019. The analysis was based on aBayesian unfolding procedure, which was applied on a subsample of vertical HAWCdata that was enriched to $82\%$ of events induced by light nuclei. To achievethe mass separation, a cut on the lateral age of air shower data was set guidedby predictions of CORSIKA/QGSJET-II-04 simulations. The measured spectrum isconsistent with a broken power-law spectrum and shows a kneelike feature ataround $E = 24.0^{+3.6}_{-3.1} $ TeV, with a spectral index $\gamma = -2.51 \pm0.02$ before the break and with $\gamma = -2.83 \pm 0.02$ above it. The featurehas a statistical significance of $4.1 \, \sigma$. Within systematicuncertainties, the significance of the spectral break is $0.8 \, \sigma$.

Cosmic ray spectrum of protons plus helium nuclei between 6 TeV and 158 TeV from HAWC data