CRESST-II暗物质搜寻的调试运行
天体物理学
2009-04-30 v2
摘要
位于Gran Sasso的CRESST低温直接暗物质搜寻实验,通过核反冲搜寻WIMP,经过多项更改和改进升级为CRESST-II。我们展示了2007年进行的一次调试运行的结果。CRESST-II的基本元件是一个探测器模块,由一个大的(约300克)CaWO_4晶体和一个非常灵敏的较小的(约2克)光探测器组成,用于探测CaWO_4的闪烁光。来自光猝灭因子研究的信息允许定义能量-光产额平面中对应于钨反冲的区域。报告了一项中子测试,该测试支持使用光产额来识别反冲核的原理。展示了使用两个探测器模块在总曝光量为48公斤·天的数据。根据“所有核反冲”接受区域中的事件率判断,该装置相比之前的结果显示出约十倍的改进,我们将其主要归因于中子屏蔽的存在。在“钨反冲”接受区域中发现了三个事件,对应的事件率为每公斤·天0.063个。基于暗物质通量、相干或自旋无关相互作用的标准假设,在WIMP质量约50 GeV时,得出WIMP-核子散射的上限为4.8 × 10^{-7} pb。
引用
@article{arxiv.0809.1829,
title = {Commissioning Run of the CRESST-II Dark Matter Search},
author = {G. Angloher and M. Bauer and I. Bavykina and A. Bento and A. Brown and C. Bucci and C. Ciemniak and C. Coppi and G. Deuter and F. von Feilitzsch and D. Hauff and S. Henry and P. Huff and J. Imber and S. Ingleby and C. Isaila and J. Jochum and M. Kiefer and M. Kimmerle and H. Kraus and J. -C. Lanfranchi and R. F. Lang and B. Majorovits and M. Malek and R. McGowan and V. B. Mikhailik and E. Pantic and F. Petricca and S. Pfister and W. Potzel and F. Proebst and W. Rau and S. Roth and K. Rottler and C. Sailer and K. Schaeffner and J. Schmaler and S. Scholl and W. Seidel and L. Stodolsky and A. J. B. Tolhurst and I. Usherov and W. Westphal},
journal= {arXiv preprint arXiv:0809.1829},
year = {2009}
}
备注
10 pages, 9 figs No essential changes in content. Minor errors corrected. Sentence added at end of introduction concerning increased sensitivity. Best limit on plots at M=50 GeV. Text labelling of candidate events corrected