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arXiv 0810.1682hep-ex
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地下高能μ子产生中子的模拟

Simulation of neutrons produced by high-energy muons underground

A. Lindote, H. M. Araujo, V. A. Kudryavtsev, M. Robinson

摘要:

本文介绍了蒙特卡罗模拟用于解释测量的μ介子诱导的中子通量在博尔比地下实验室(北约克郡,英国),最近进行了使用大型闪烁体否决部署在ZEPLIN-II WIMP探测器。在对中子产生模型进行相关基准测试和验证后,使用了GEANT 4工具包的8.2版。在Monte Carlo和实验数据之间的直接比较中,我们发现模拟产生了1.8倍更高的中子速率,我们将其解释为GEANT 4在铅中的过量生产。这种材料在中子产生中的优势使我们能够估算出铅的绝对中子产额为(1.31 +/- 0.06)x 10^(-3)中子/μ子/(g/cm^2),μ子的平均能量为260 GeV。在ZEPLIN-II目标体积(约1年暴露)中模拟的由μ子诱导的中子引起的核反冲表明,尽管在暗物质搜索的感兴趣的能量范围内,预期来自该背景源的事件发生率很小,但没有事件在否决权的反符合切割中幸存下来。

英文摘要:

This article describes the Monte Carlo simulation used to interpret the measurement of the muon-induced neutron flux in the Boulby Underground Laboratory (North Yorkshire, UK), recently performed using a large scintillator veto deployed around the ZEPLIN-II WIMP detector. Version 8.2 of the GEANT4 toolkit was used after relevant benchmarking and validation of neutron production models. In the direct comparison between Monte Carlo and experimental data, we find that the simulation produces a 1.8 times higher neutron rate, which we interpret as over-production in lead by GEANT4. The dominance of this material in neutron production allows us to estimate the absolute neutron yield in lead as (1.31 +/- 0.06) x 10^(-3) neutrons/muon/(g/cm^2) for a mean muon energy of 260 GeV. Simulated nuclear recoils due to muon-induced neutrons in the ZEPLIN-II target volume (~1 year exposure) showed that, although a small rate of events is expected from this source of background in the energy range of interest for dark matter searches, no event survives an anti-coincidence cut with the veto.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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