Atmospheric charged $$K/\pi $$K/π ratio and measurement of muon annual modulation with a liquid scintillation detector at Soudan
Atmospheric charged $$K/\pi $$K/π ratio and measurement of muon annual modulation with a liquid scintillation detector at Soudan
复制标题
苏丹使用液体闪烁探测器进行大气充电 $$K/pi $$K/Ï 比值和 μ 子年调制测量
DOI：
10.1140/epjc/s10052-019-7344-9
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Mei, D.-M.
中科院分区：
文献类型：
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作者：
Zhang, C.;Mei, D.-M.
本文报道了在苏丹市地下实验室研制的寿命超过4年的12-L液体闪烁探测器的介子年调制测量。通过观察到的脉冲形状和大的能量沉积，确定了探测器中的Muon最小电离。探测器中测量到的介子速率是每天调制幅度为()%的介子，相位为7月。这种年调制与平流层有效大气温度的变化有关。相关系数被确定为。这可以解释为测量大气中带电的介子与介子()之比for TeV，与MINOS Far探测器的测量结果一致。为了进一步限制比的值，对能量高达100TeV的初级宇宙线质子进行了Geant4模拟，研究了能量大于0.5TeV的Muon年调制与比的相关性。我们发现，在距地球表面30公里的平流层生产点，0.1598的带电比大于这项工作的上限(0.138)，并不能在南丹深处引起Muon的年调制。
We report a measurement of muon annual modulation in a 12-l liquid scintillation detector with a live-time of more than 4 years at the Soudan Underground Laboratory. Muon minimum ionization in the detector is identified by its observed pulse shape and large energy deposition. The measured muon rate in the detector ismuons per day with a modulation amplitude of ()% and a phase at Juldays. This annual modulation is correlated with the variation of the effective atmospheric temperature in the stratosphere. The correlation coefficient,, is determined to be. This can be interpreted as a measurement of the atmospheric charged kaon to pion () ratio offorTeV, consistent with the measurement from the MINOS far detector. To further constrain the value ofratio, a Geant4 simulation of the primary cosmic-ray protons with energy up to 100 TeV is implemented to study the correlation ofratio and the muon annual modulation for muon energy greater than 0.5 TeV. We find out that a chargedratio of 0.1598, greater than the upper bound (0.138) from this work at the production point 30 km above the Earth surface in the stratosphere cannot induce muon annual modulation at the depth of Soudan.