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首页> 外文期刊>EPJ Web of Conferences >Study of muons in extensive air showers from ultra-high energy cosmic rays measured with the Telescope Array experiment
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Study of muons in extensive air showers from ultra-high energy cosmic rays measured with the Telescope Array experiment

机译：利用望远镜阵列实验测量的超高能宇宙射线对大风淋中的μ子的研究

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The origin of ultra-high energy cosmic rays (UHECRs) has been a long-standing mystery. One of the uncertainties in UHECR observation derives from the hadronic interaction model used for air shower Monte-Carlo (MC) simulations. The number of muons observed at ground level from UHECR induced air showers is expected to depend upon the composition of primary cosmic rays. The MC prediction also depends on hadronic interaction models. One may test the hadronic interaction models by comparing the measured number of muons with the MC prediction. The Telescope Array (TA) is the largest experiment in the northern hemisphere observing UHECR in Utah, USA. It aims to reveal the origin of UHECR by studying the energy spectrum, mass composition and anisotropy of cosmic rays by utilizing an array of surface detectors (SDs) and fluorescence detectors. We studied muon densities in the UHE extensive air showers by analyzing the signal of TA SD stations for highly inclined showers which should have high muon purity. A high muon purity condition is imposed that requires the geometry of the shower and relative position of the given station and implies that muons dominate the signal. On condition that the muons contribute about 65% of the total signal, the number of particles from air showers is typically 1.88 ± 0.08(stat:) ± 0.42(syst:) times larger than the MC prediction with the QGSJET II-03 model for protons. The same feature was also obtained for other hadronic models, such as QGSJET II-04.
机译：超高能宇宙射线（UHECR）的起源一直是一个长期的谜。 UHECR观测的不确定性之一来自用于空气淋浴蒙特卡洛（MC）模拟的强子相互作用模型。预计从UHECR诱发的空气喷淋在地面上观察到的μ子的数量取决于主要宇宙射线的成分。 MC的预测还取决于强子相互作用模型。可以通过将测得的μ子数与MC预测值进行比较来测试强子相互作用模型。望远镜阵列（TA）是北半球最大的实验，观测美国犹他州的UHECR。它旨在通过利用一系列表面检测器（SD）和荧光检测器研究宇宙射线的能谱，质量组成和各向异性来揭示UHECR的起源。我们通过分析TA SD站的信号来分析UHE大型空气淋浴器中的介子密度，该高度差的淋浴器应具有较高的μon纯度。施加高μ子纯度条件，这需要淋浴的几何形状和给定​​站的相对位置，并暗示μ子在信号中起主导作用。如果μ子贡献了总信号的约65％，则空气喷淋的颗粒数通常是QGSJET II-03模型的MC预测值的1.88±0.08（stat :)±0.42（syst :)倍。质子对于其他强子模型，例如QGSJET II-04，也获得了相同的功能。

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