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Since 1996, a hybrid experiment consisting of the emulsion chamber and burstdetector array and the Tibet-II air-shower array has been operated atYangbajing (4300 m above sea level, 606 g/cm^2) in Tibet. This experiment candetect air-shower cores, called as burst events, accompanied by air showers inexcess of about 100 TeV. We observed about 4300 burst events accompanied by airshowers during 690 days of operation and selected 820 proton-induced eventswith its primary energy above 200 TeV using a neural network method. Using thisdata set, we obtained the energy spectrum of primary protons in the energyrange from 200 to 1000 TeV. The differential energy spectrum obtained in thisenergy region can be fitted by a power law with the index of -2.97 $\pm$ 0.06,which is steeper than that obtained by direct measurements at lower energies.We also obtained the energy spectrum of helium nuclei at particle energiesaround 1000 TeV.Comment: 25 pages, 22 figures, Accepted for publication in Phys. Rev.

Primary proton spectrum between 200 TeV and 1000 TeV observed with the Tibet burst detector and air shower array