Cosmic-ray spectra of primary protons and high altitude muons deconvolved from observed atmospheric gamma rays
Cosmic-ray spectra of primary protons and high altitude muons deconvolved from observed atmospheric gamma rays
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DOI：
10.1103/physrevd.74.083511
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发表时间：
2006-09
影响因子：
5
通讯作者：
K. Yoshida;R.Ohmori R.Ohmori-R.Ohmori;T. Kobayashi;Y. Komori;Y. Sato;J. Nishimura
中科院分区：
文献类型：
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作者：
K. Yoshida;R.Ohmori R.Ohmori-R.Ohmori;T. Kobayashi;Y. Komori;Y. Sato;J. Nishimura
我们在气球高度的乳胶室中观测到了从30GeV到8TeV的大气伽马射线，累积了迄今为止这个能量范围内最大的总照射量，S{欧米伽}T{约}6.66m{sup 2}sr。在非常高的高度，仅有几个g cm的剩余覆盖层，大气伽马射线主要是由初级宇宙射线与上覆大气核的单一相互作用产生的。因此，我们可以利用这些伽马射线来研究大气中初级宇宙射线及其产物的光谱。假设适当的强子相互作用模型，我们从观测到的大气伽马射线能谱中反卷积了初级宇宙线质子能谱。我们的去卷积质子谱覆盖了从200GeV到50TeV的能量范围，填补了目前可用的初级宇宙线质子谱的空白。我们还从我们的伽马射线谱估计了高海拔30GeV以上的大气Muon谱，几乎没有参考原始宇宙线，并将估计的通量与低于20GeV的直接Muon观测进行了比较。
We have observed atmospheric gamma rays from 30 GeV to 8 TeV, using emulsion chambers at balloon altitudes, accumulating the largest total exposure in this energy range to date, S{omega}T{approx}6.66 m{sup 2} sr day. At very high altitudes, with residual overburden only a few g cm{sup -2}, atmospheric gamma rays are mainly produced by a single interaction of primary cosmic rays with overlying atmospheric nuclei. Thus, we can use these gamma rays to study the spectrum of primary cosmic rays and their products in the atmosphere. From the observed atmospheric gamma-ray spectrum, we deconvolved the primary cosmic-ray proton spectrum, assuming appropriate hadronic interaction models. Our deconvolved proton spectrum covers the energy range from 200 GeV to 50 TeV, which fills a gap in the currently available primary cosmic-ray proton spectra. We also estimated the atmospheric muon spectrum above 30 GeV at high altitude from our gamma-ray spectrum, almost without reference to the primary cosmic rays, and compared the estimated flux with direct muon observations below 20 GeV.