Primary proton spectrum between 200-TeV and 1000-TeV observed with the Tibet burst detector and air shower array
Primary proton spectrum between 200-TeV and 1000-TeV observed with the Tibet burst detector and air shower array
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DOI：
10.1103/physrevd.62.112002
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发表时间：
2000-10
影响因子：
5
通讯作者：
M. Amenomori;S. Ayabe;Caidong;E. al.
中科院分区：
文献类型：
--
作者：
M. Amenomori;S. Ayabe;Caidong;E. al.
这个实验可以探测到空气阵雨的核心，称为爆发事件，伴随着超过约100 TeV的空气阵雨。在690天的运行中，我们观测到约4300个伴随空气阵雨的爆发事件，并利用神经网络方法选择了820个一次能量大于200tev的质子诱导事件。利用该数据集，我们得到了200 ~ 1000 TeV能量范围内初级质子的能谱。在该能量区域得到的微分能谱可以用幂律拟合，其指数为$\ensuremath{-}2.97\ifmmode\pm\else\textpm\fi{}0.06 $，比在较低能量区域直接测量得到的谱陡。我们还得到了粒子能量在1000 TeV左右时氦原子核的能谱。
Since 1996, a hybrid experiment consisting of the emulsion chamber and burst detector array and the Tibet-II air-shower array has been operated at Yangbajing (4300 m above sea level, 606 $\mathrm{g}/{\mathrm{cm}}^{2})$ in Tibet. This experiment can detect air-shower cores, called burst events, accompanied by air showers in excess of about 100 TeV. We observed about 4300 burst events accompanied by air showers during 690 days of operation and selected 820 proton-induced events with its primary energy above 200 TeV using a neural network method. Using this data set, we obtained the energy spectrum of primary protons in the energy range from 200 to 1000 TeV. The differential energy spectrum obtained in this energy region can be fitted by a power law with the index of $\ensuremath{-}2.97\ifmmode\pm\else\textpm\fi{}0.06,$ which is steeper than that obtained by direct measurements at lower energies. We also obtained the energy spectrum of helium nuclei at particle energies around 1000 TeV.