Reconstruction of cosmic ray air showers with Tunka-Rex data using template fitting of radio pulses
Reconstruction of cosmic ray air showers with Tunka-Rex data using template fitting of radio pulses
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DOI：
10.1103/physrevd.97.122004
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发表时间：
2018-03
影响因子：
5
通讯作者：
P. Bezyazeekov;N. Budnev;D. Chernykh;O. Fedorov;O. Gress;A. Haungs;R. Hiller;T. Huege;Y. Kazarina;M. Kleifges;D. Kostunin;E. Korosteleva;L. Kuzmichev;V. Lenok;N. Lubsandorzhiev;T. Marshalkina;R. Mirgazov;R. Monkhoev;E. Osipova;A. Pakhorukov;L. Pankov;V. Prosin;F. Schröder;D. Shipilov;A. Zagorodnikov
中科院分区：
文献类型：
--
作者：
P. Bezyazeekov;N. Budnev;D. Chernykh;O. Fedorov;O. Gress;A. Haungs;R. Hiller;T. Huege;Y. Kazarina;M. Kleifges;D. Kostunin;E. Korosteleva;L. Kuzmichev;V. Lenok;N. Lubsandorzhiev;T. Marshalkina;R. Mirgazov;R. Monkhoev;E. Osipova;A. Pakhorukov;L. Pankov;V. Prosin;F. Schröder;D. Shipilov;A. Zagorodnikov
本文提出了一种改进的方法，用稀疏射电阵列精确重建10 ^{17}$ eV以上的宇宙线空气簇射。该方法是基于无线电脉冲形状的预测的比较，通过CoREAS模拟测量脉冲。我们将我们的方法应用于通卡-雷克斯的数据，通卡-雷克斯是西伯利亚一个1 km^2 $的无线电阵列，工作在30-80 MHz的频带上。通卡-雷克斯由空气切伦科夫探测器通卡-133和发射器（通卡-格兰德）触发。该仪器收集自2012年以来的空气簇射数据。本文介绍了最新的数据和信号分析的Tunka-Rex和一种新的方法的细节。在效率削减后，当Tunka-Rex达到其最高效率时，由于校准不确定性和簇射波动，新方法给出的约10%的能量分辨率已达到系统不确定性的极限。与此同时，与基于横向分布斜率的先前方法相比，簇射最大值重建被显著改善，高达35 g/cm^2 $的精度。我们还定义了测量的条件，并在此条件下实现了Tunka-Rex的簇射最大分辨率达到25 g/cm^2 $，与光学探测器相比具有竞争力。为了检查和验证我们的重建和效率削减，我们将个别事件与Tunka-133的重建进行比较。此外，我们比较平均簇射最大值作为一个函数的初级能量的其他实验的测量。
We present an improved method for the precise reconstruction of cosmic ray air showers above $10^{17}$ eV with sparse radio arrays. The method is based on the comparison of predictions for radio pulse shapes by CoREAS simulations to measured pulses. We applied our method to the data of Tunka-Rex, a 1 km$^2$ radio array in Siberia operating in the frequency band of 30-80 MHz. Tunka-Rex is triggered by the air-Cherenkov detector Tunka-133 and by scintillators (Tunka-Grande). The instrument collects air-shower data since 2012. The present paper describes updated data and signal analyses of Tunka-Rex and details of a new method applied. After efficiency cuts, when Tunka-Rex reaches its full efficiency, the energy resolution of about 10% given by the new method has reached the limit of systematic uncertainties due to the calibration uncertainty and shower-to-shower fluctuations. At the same time the shower maximum reconstruction is significantly improved up to an accuracy of 35 g/cm$^2$ compared to the previous method based on the slope of the lateral distribution. We also define and now achieved conditions of the measurements, at which the shower maximum resolution of Tunka-Rex reaches a value of 25 g/cm$^2$ and becomes competitive to optical detectors. To check and validate our reconstruction and efficiency cuts we compare individual events to the reconstruction of Tunka-133. Furthermore, we compare the mean of shower maximum as a function of primary energy to the measurements of other experiments.