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arXiv 1008.0145astro-ph.IMhep-ex
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直接WIMP探测器中子本底的评价

Evaluation of the Neutron Background in a Direct WIMP Detector with Neutron Veto System Based on Gd-doped Liquid Scintillator

Ye Xu, XiangPan Ji, ZeLong Liu, DanNing Di, HaoKai Sun, Yu Lei

摘要:

设计了一种具有中子否决系统的直接弱相互作用大质量粒子(WIMP)探测器,以更好地拒绝中子。本文研究了两种实验配置:一种是将中微子探测器置于装有Gd的闪烁体中,另一种是将中微子探测器置于反应堆中微子探测器中。掺钆液体闪烁体(或中微子探测器)被用作中子否决装置。两个实验设计的中子背景估计使用Geant 4模拟。结果表明,每吨液态氙的中子本底可降低到O(0.1)事件/年。我们计算了自旋无关的WIMP-核子弹性散射的灵敏度。一吨$\times$/年的暴露量可达到约6 $\times$ $10^{-11}$ pb的横截面。

英文摘要:

A direct WIMP (Weakly Interacting Massive Particle) detector with a neutron veto system is designed to better reject neutrons. Two experimental configurations are studied in the present paper: one is for an Xe detector enclosed in a Gd-loaded scintillator and the other one is for an Xe detector placed inside a reactor neutrino detector. The Gd-doped liquid scintillator (or the neutrino detector) is used as a neutron veto device. The neutron backgrounds for the two experimental designs have been estimated using Geant4 simulations. The results show that the neutron backgrounds can decrease to O(0.1) events per year per tonne of liquid Xenon. We calculate the sensitivities to spin-independent WIMP-nucleon elastic scattering. An exposure of one tonne $\times$ year could reach a cross-section of about 6$\times$$10^{-11}$ pb.

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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