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arXiv 1306.6283astro-ph.HE
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宇宙射线元素群能谱的KASCADE-Grande测量

KASCADE-Grande measurements of energy spectra for elemental groups of cosmic rays

Grande Collaboration, W. D. Apel, J. C. Arteaga-Velàzquez, K. Bekk, M. Bertaina, J. Blümer, H. Bozdog, I. M. Brancus, E. Cantoni, A. Chiavassa, F. Cossavella, K… 展开作者

Grande Collaboration, W. D. Apel, J. C. Arteaga-Velàzquez, K. Bekk, M. Bertaina, J. Blümer, H. Bozdog, I. M. Brancus, E. Cantoni, A. Chiavassa, F. Cossavella, K. Daumiller, V. de Souza, F. Di Pierro, P. Doll, R. Engel, J. Engler, M. Finger, B. Fuchs, D. Fuhrmann, H. J. Gils, R. Glasstetter, C. Grupen, A. Haungs, D. Heck, J. R. Hörandel, D. Huber, T. Huege, K. -H. Kampert, D. Kang, H. O. Klages, K. Link, P. Łuczak, M. Ludwig, H. J. Mathes, H. J. Mayer, M. Melissas, J. Milke, B. Mitrica, C. Morello, J. Oehlschläger, S. Ostapchenko, N. Palmieri, M. Petcu, T. Pierog, H. Rebel, M. Roth, H. Schieler, S. Schoo, F. G. Schröder, O. Sima, G. Toma, G. C. Trinchero, H. Ulrich, A. Weindl, J. Wochele, M. Wommer, J. Zabierowski

摘要:

KASCADE-Grande空气簇射实验[W. Apel,et al.(KASCADE-Grande collaboration),Nucl.Instrum.2004.方法A 620(2010)202]尤其包括用于测量带电粒子Nch的大型闪烁体阵列和用于μ子计数Nmu的屏蔽闪烁计数器阵列。KASCADE-Grande最适合于10 PeV至2000 PeV能量范围内的宇宙射线测量,其中探索成分对于理解宇宙射线从银河系到河外起源的过渡至关重要。在对KASCADE数据进行膝能区全粒子谱和元素谱重建的基础上,提出了一种新的能谱重建方法。Antoni,et al.(KASCADE collaboration),Astropart. 24(2005)1],我们现在已经将这些测量扩展到超过200 PeV。通过分析近垂直事件的二维簇射大小谱Nch与Nmu,我们通过展开方法在探测器完全有效的能量范围内重建了不同质量群的能谱。的程序和它的结果,这是基于强子相互作用模型QGSJET-II-02得出的,并产生一个强有力的指示重质量群的主导地位,在覆盖的能量范围内,并在铁谱中的膝状结构在80 PeV左右,提出。这证实并进一步完善了通过对KASCADE-Grande数据的其他分析所获得的结果,这些数据已经为大约80 PeV [W]的宇宙射线的重组分中的膝状结构提供了证据。Apel,et al.(KASCADE-Grande collaboration),Phys. Rev. Lett. 107(2011)171104]。

英文摘要:

The KASCADE-Grande air shower experiment [W. Apel, et al. (KASCADE-Grande collaboration), Nucl. Instrum. Methods A 620 (2010) 202] consists of, among others, a large scintillator array for measurements of charged particles, Nch, and of an array of shielded scintillation counters used for muon counting, Nmu. KASCADE-Grande is optimized for cosmic ray measurements in the energy range 10 PeV to about 2000 PeV, where exploring the composition is of fundamental importance for understanding the transition from galactic to extragalactic origin of cosmic rays. Following earlier studies of the all-particle and the elemental spectra reconstructed in the knee energy range from KASCADE data [T. Antoni, et al. (KASCADE collaboration), Astropart. Phys. 24 (2005) 1], we have now extended these measurements to beyond 200 PeV. By analysing the two-dimensional shower size spectrum Nch vs. Nmu for nearly vertical events, we reconstruct the energy spectra of different mass groups by means of unfolding methods over an energy range where the detector is fully efficient. The procedure and its results, which are derived based on the hadronic interaction model QGSJET-II-02 and which yield a strong indication for a dominance of heavy mass groups in the covered energy range and for a knee-like structure in the iron spectrum at around 80 PeV, are presented. This confirms and further refines the results obtained by other analyses of KASCADE-Grande data, which already gave evidence for a knee-like structure in the heavy component of cosmic rays at about 80 PeV [W. Apel, et al. (KASCADE-Grande collaboration), Phys. Rev. Lett. 107 (2011) 171104].

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