arXiv 1306.23032013-06astro-ph.IMphysics.ins-det

XENON100暗物质实验的中子背景

The neutron background of the XENON100 dark matter experiment

E. Aprile, M. Alfonsi, K. Arisaka, F. Arneodo, C. Balan, L. Baudis, B. Bauermeister, A. Behrens, P. Beltrame, K. Bokeloh, A. Brown, E. Brown, G. Bruno, R. Budni… 展开作者

E. Aprile, M. Alfonsi, K. Arisaka, F. Arneodo, C. Balan, L. Baudis, B. Bauermeister, A. Behrens, P. Beltrame, K. Bokeloh, A. Brown, E. Brown, G. Bruno, R. Budnik, J. M. R. Cardoso, W. -T. Chen, B. Choi, A. P. Colijn, H. Contreras, J. P. Cussonneau, M. P. Decowski, E. Duchovni, S. Fattori, A. D. Ferella, W. Fulgione, F. Gao, M. Garbini, C. Ghag, K. -L. Giboni, L. W. Goetzke, C. Grignon, E. Gross, W. Hampel, F. Kaether, A. Kish, J. Lamblin, H. Landsman, R. F. Lang, M. Le Calloch, C. Levy, K. E. Lim, Q. Lin, S. Lindemann, M. Lindner, J. A. M. Lopes, K. Lung, T. Marrodan Undagoitia, F. V. Massoli, A. J. Melgarejo Fernandez, Y. Meng, M. Messina, A. Molinario, K. Ni, U. Oberlack, S. E. A. Orrigo, E. Pantic, R. Persiani, G. Plante, N. Priel, A. Rizzo, S. Rosendahl, J. M. F. dos Santos, G. Sartorelli, J. Schreiner, M. Schumann, L. ScottoLavina, P. R. Scovell, M. Selvi, P. Shagin, H. Simgen, A. Teymourian, D. Thers, E. Tziaferi, O. Vitells, H. Wang, M. Weber, C. Weinheimer

DOI：: 10.1088/0954-3899/40/11/115201

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摘要：

XENON100实验安装在大萨索国家实验室（LNGS）的地下，旨在通过氙核的弹性散射直接探测弱相互作用大质量粒子（WIMPs）形式的暗物质。本文介绍了实验的核反冲本底的研究，考虑到中子本底（$α$，n）和自发裂变反应，由于探测器和屏蔽材料中的天然放射性，以及μ子感生的中子。基于蒙特卡罗模拟，利用探测器各部件的实测放射性污染，对2011年和2012年XENON 100实验公布的WIMP搜索结果分别进行了核反冲本底预测，分别为0.11 $^{+0.08}_{-0.04}$事件和0.17 $^{+0.12}_{-0.07}$事件，并得出结论：它们不会限制实验的灵敏度。

英文摘要：

The XENON100 experiment, installed underground at the Laboratori Nazionali del Gran Sasso (LNGS), aims to directly detect dark matter in the form of Weakly Interacting Massive Particles (WIMPs) via their elastic scattering off xenon nuclei. This paper presents a study on the nuclear recoil background of the experiment, taking into account neutron backgrounds from ($α$,n) and spontaneous fission reactions due to natural radioactivity in the detector and shield materials, as well as muon-induced neutrons. Based on Monte Carlo simulations and using measured radioactive contaminations of all detector components, we predict the nuclear recoil backgrounds for the WIMP search results published by the XENON100 experiment in 2011 and 2012, 0.11$^{+0.08}_{-0.04}$ events and 0.17$^{+0.12}_{-0.07}$ events, respectively, and conclude that they do not limit the sensitivity of the experiment.

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