3800 米水当量深度下 Borexino 实验中的宇宙射线本底
仪器与探测器
2015-06-15 v2 高能物理 - 实验
摘要
位于 Gran Sasso 地下实验室的太阳中微子实验 Borexino，在研究有机液体闪烁体中由缪子诱导的本底方面处于独特地位。在本研究中，通过液体闪烁体外部的缪子否决探测器以及缪子穿过闪烁体体积时观测到的特定光模式，识别并追踪了大量宇宙缪子样本。研究发现，缪子诱导中子的产额为 Yn = (3.10+-0.11)10-4 n/({\mu} (g/cm2))。母体缪子径迹与中子俘获点之间的距离分布的平均值为 {\lambda} = (81.5 +- 2.7)cm。此外，还测量了多种宇宙射线成因放射性同位素（12N, 12B, 8He, 9C, 9Li, 8B, 6He, 8Li, 11Be, 10C 和 11C）的产额。所有结果均与使用 Fluka 和 Geant4 软件包的 Monte Carlo 模拟预测进行了比较。观察到宇宙射线成因产额的数据与模拟总体一致，仅有少数例外，其中最显著的是 11C 产额，两种代码返回的值均低约 50%。发现的预测 {\mu}-n 距离分布和中子多重性分布与数据总体一致。
引用
@article{arxiv.1304.7381,
title = {Cosmogenic Backgrounds in Borexino at 3800 m water-equivalent depth},
author = {G. Bellini and J. Benziger and D. Bick and G. Bonfini and D. Bravo and M. Buizza Avanzini and B. Caccianiga and L. Cadonati and F. Calaprice and P. Cavalcante and A. Chavarria and A. Chepurnov and D. D'Angelo and S. Davini and A. Derbin and A. Empl and A. Etenko and K. Fomenko and D. Franco and C. Galbiati and S. Gazzana and C. Ghiano and M. Giammarchi and M. Göger-Neff and A. Goretti and L. Grandi and C. Hagner and E. Hungerford and Aldo Ianni and Andrea Ianni and V. Kobychev and D. Korablev and G. Korga and D. Kryn and M. Laubenstein and T. Lewke and E. Litvinovich and B. Loer and P. Lombardi and F. Lombardi and L. Ludhova and G. Lukyanchenko and I. Machulin and S. Manecki and W. Maneschg and G. Manuzio and Q. Meindl and E. Meroni and L. Miramonti and M. Misiaszek and R. Möllenberg and P. Mosteiro and V. Muratova and L. Oberauer and M. Obolensky and F. Ortica and K. Otis and M. Pallavicini and L. Papp and L. Perasso and S. Perasso and A. Pocar and G. Ranucci and A. Razeto and A. Re and A. Romani and N. Rossi and R. Saldanha and C. Salvo and S. Schönert and H. Simgen and M. Skorokhvatov and O. Smirnov and A. Sotnikov and S. Sukhotin and Y. Suvorov and R. Tartaglia and G. Testera and D. Vignaud and R. B. Vogelaar and F. von Feilitzsch and J. Winter and M. Wojcik and A. Wright and M. Wurm and J. Xu and O. Zaimidoroga and S. Zavatarelli and G. Zuzel},
journal= {arXiv preprint arXiv:1304.7381},
year = {2015}
}
备注
26 pages, 13 figures (in 14 files), 4 tables. 3 extra data files. accepted by JCAP