利用 26 个 IceTop 站测量的全粒子宇宙射线能谱
高能天体物理现象
2012-02-15 v1
摘要
我们报告了利用位于南极的冰立方中微子观测台表面组件 IceTop 空气簇射阵列对宇宙射线能谱的测量结果。本分析使用的数据采集于 2007 年 6 月至 10 月期间，当时有 26 个表面站处于运行状态，约占最终阵列的三分之一。本分析使用的有效面积为 0.122 km^2。该分析调查了在 0{\deg} 到 46{\deg} 之间三个不同天顶角范围内测量的 1 到 100 PeV 的能谱。由于宇宙射线在此能量范围内的各向同性，所有天顶角区间的能谱必须一致。我们在关于原初质量成分的不同假设下确定了宇宙射线能谱。在纯质子假设和简单的双成分模型下，发现三个天顶角范围内的能谱吻合良好。对于质量依赖性最小的天顶角 {\theta} < 30{\deg} 的情况，根据成分假设的不同，在 3.5 到 4.32 PeV 之间观测到了宇宙射线能谱中的“膝”区。膝区以上的谱指数根据原初质量成分假设的不同，范围从 -3.08 到 -3.11。此外，还观测到能谱在 22 PeV 以上存在变平的迹象。
引用
@article{arxiv.1202.3039,
title = {All-particle cosmic ray energy spectrum measured with 26 IceTop stations},
author = {IceCube Collaboration and R. Abbasi and Y. Abdou and T. Abu-Zayyad and M. Ackermann and J. Adams and J. A. Aguilar and M. Ahlers and D. Altmann and K. Andeen and J. Auffenberg and X. Bai and M. Baker and S. W. Barwick and V. Baum and R. Bay and J. L. Bazo Alba and K. Beattie and J. J. Beatty and S. Bechet and J. K. Becker and K. -H. Becker and M. Bell and M. L. Benabderrahmane and S. BenZvi and J. Berdermann and P. Berghaus and D. Berley and E. Bernardini and D. Bertrand and D. Z. Besson and D. Bindig and M. Bissok and E. Blaufuss and J. Blumenthal and D. J. Boersma and C. Bohm and D. Bose and S. Böser and O. Botner and L. Brayeur and A. M. Brown and S. Buitink and K. S. Caballero-Mora and M. Carson and M. Casier and D. Chirkin and B. Christy and F. Clevermann and S. Cohen and D. F. Cowen and A. H. Cruz Silva and M. V. D'Agostino and M. Danninger and J. Daughhetee and J. C. Davis and C. De Clercq and T. Degner and F. Descamps and P. Desiati and G. de Vries-Uiterweerd and T. DeYoung and J. C. Díaz-Vélez and J. Dreyer and J. P. Dumm and M. Dunkman and J. Eisch and R. W. Ellsworth and O. Engdegård and S. Euler and P. A. Evenson and O. Fadiran and A. R. Fazely and A. Fedynitch and J. Feintzeig and T. Feusels and K. Filimonov and C. Finley and T. Fischer-Wasels and S. Flis and A. Franckowiak and R. Franke and T. K. Gaisser and J. Gallagher and L. Gerhardt and L. Gladstone and T. Glüsenkamp and A. Goldschmidt and J. A. Goodman and D. Góra and D. Grant and A. Groß and S. Grullon and M. Gurtner and C. Ha and A. Haj Ismail and A. Hallgren and F. Halzen and K. Han and K. Hanson and P. Heimann and D. Heinen and K. Helbing and R. Hellauer and S. Hickford and G. C. Hill and K. D. Hoffman and B. Hoffmann and A. Homeier and K. Hoshina and W. Huelsnitz and P. O. Hulth and K. Hultqvist and S. Hussain and A. Ishihara and E. Jacobi and J. Jacobsen and G. S. Japaridze and H. Johansson and A. Kappes and T. Karg and A. Karle and J. Kiryluk and F. Kislat and S. R. Klein and S. Klepser and J. -H. Köhne and G. Kohnen and H. Kolanoski and L. Köpke and S. Kopper and D. J. Koskinen and M. Kowalski and M. Krasberg and G. Kroll and J. Kunnen and N. Kurahashi and T. Kuwabara and M. Labare and K. Laihem and H. Landsman and M. J. Larson and R. Lauer and J. Lünemann and J. Madsen and R. Maruyama and K. Mase and H. S. Matis and K. Meagher and M. Merck and P. Mészáros and T. Meures and S. Miarecki and E. Middell and N. Milke and J. Miller and T. Montaruli and R. Morse and S. M. Movit and R. Nahnhauer and J. W. Nam and U. Naumann and S. C. Nowicki and D. R. Nygren and S. Odrowski and A. Olivas and M. Olivo and A. O'Murchadha and S. Panknin and L. Paul and C. Pérez de los Heros and D. Pieloth and J. Posselt and P. B. Price and G. T. Przybylski and K. Rawlins and P. Redl and E. Resconi and W. Rhode and M. Ribordy and M. Richman and B. Riedel and J. P. Rodrigues and F. Rothmaier and C. Rott and T. Ruhe and D. Rutledge and B. Ruzybayev and D. Ryckbosch and H. -G. Sander and M. Santander and S. Sarkar and K. Schatto and M. Scheel and T. Schmidt and S. Schöneberg and A. Schönwald and A. Schukraft and L. Schulte and A. Schultes and O. Schulz and M. Schunck and D. Seckel and B. Semburg and S. H. Seo and Y. Sestayo and S. Seunarine and A. Silvestri and M. W. E. Smith and G. M. Spiczak and C. Spiering and M. Stamatikos and T. Stanev and T. Stezelberger and R. G. Stokstad and A. Stößl and E. A. Strahler and R. Ström and M. Stüer and G. W. Sullivan and H. Taavola and I. Taboada and A. Tamburro and S. Ter-Antonyan and S. Tilav and P. A. Toale and S. Toscano and D. Tosi and N. van Eijndhoven and A. Van Overloop and J. van Santen and M. Vehring and M. Voge and C. Walck and T. Waldenmaier and M. Wallraff and M. Walter and R. Wasserman and Ch. Weaver and C. Wendt and S. Westerhoff and N. Whitehorn and K. Wiebe and C. H. Wiebusch and D. R. Williams and R. Wischnewski and H. Wissing and M. Wolf and T. R. Wood and K. Woschnagg and C. Xu and D. L. Xu and X. W. Xu and J. P. Yanez and G. Yodh and S. Yoshida and P. Zarzhitsky and M. Zoll},
journal= {arXiv preprint arXiv:1202.3039},
year = {2012}
}
备注
38 pages, 17 figures