Observation of muon intensity variations by season with the MINOS far detector
Observation of muon intensity variations by season with the MINOS far detector
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DOI：
10.1103/physrevd.81.012001
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发表时间：
2010-01-01
影响因子：
5
通讯作者：
Zwaska, R.
中科院分区：
文献类型：
--
作者：
Adamson, P.;Andreopoulos, C.;Zwaska, R.
高层大气的温度影响到初级宇宙射线相互作用的高度和高能宇宙射线μ子的产生，这些μ子可以在地下深处探测到。明尼苏达州苏丹的MINOS远探测器收集了超过67 × 10（6）的宇宙射线诱导的μ子。在五年的时间内测量的地下μ介子率表现出4%的峰到峰的季节变化，这是高度相关的高层大气中的温度。将μ介子速率的变化与大气温度的变化联系起来的系数alpha（T）为alpha（T）0：873 +/- 0：009（stat）+/- 0.010（syst）。在大气中宇宙线的初级强子相互作用中，由于介子和K介子的质量和寿命不同，它们对α（T）的贡献也不同。这使得alpha（T）的测量值可以解释为大于或接近7 TeV的E-p的K/pi比为0.12（-0.05）（+0.07），与对撞机实验的预期一致。
The temperature of the upper atmosphere affects the height of primary cosmic ray interactions and the production of high-energy cosmic ray muons which can be detected deep underground. The MINOS far detector at Soudan, MN, has collected over 67 X 10(6) cosmic ray induced muons. The underground muon rate measured over a period of five years exhibits a 4% peak-to-peak seasonal variation which is highly correlated with the temperature in the upper atmosphere. The coefficient, alpha(T), relating changes in the muon rate to changes in atmospheric temperature was found to be alpha(T) 0: 873 +/- 0: 009(stat) +/- 0.010(syst). Pions and kaons in the primary hadronic interactions of cosmic rays in the atmosphere contribute differently to alpha(T) due to the different masses and lifetimes. This allows the measured value of alpha(T) to be interpreted as a measurement of the K/pi ratio for E-p greater than or similar to 7 TeV of 0.12(-0.05)(+0.07), consistent with the expectation from collider experiments.