标题： 最近卡昂法兰暗物质探测中锗探测器的结果 显示英文标题

标题： Recent results from the canfranc dark matter search with germanium detectors

摘要： 两个锗探测器目前正在位于地下2450米水当量的卡昂法兰克实验室运行，用于寻找弱相互作用大质量粒子（WIMP）暗物质。其中一个为2公斤76Ge同位素IGEX探测器（RG-2），其能量阈值为4千电子伏特，低能背景率为约0.3次/千电子伏特/公斤/天。另一个为小型（234克）天然丰度锗探测器（COSME），具有低能量阈值（2.5千电子伏特）和在10千电子伏特处的能量分辨率为0.4千电子伏特，该探测器用于寻找WIMP和太阳轴子。通过分析COSME探测器收集的73公斤·日数据，寻找太阳轴子通过锗晶体的光子Primakoff转换和Bragg散射，得出轴子-光子耦合g < 2.8 × 10^-9 GeV^-1在95%置信水平下的限制。这些数据经分析后，在寻找WIMP方面提供了自旋无关WIMP-核子相互作用的排除图，改善了低质量区域之前的排除图。另一方面，从RG-2 IGEX探测器的60公斤·日数据得到的排除图，在最近由DAMA报告的年调制效应所指出的WIMP质量范围30至100 GeV区域内，改进了其他电离（非热）锗探测实验得出的排除极限。 显示英文摘要

摘要： Two germanium detectors are currently operating in the Canfranc Underground Laboratory at 2450 m.w.e looking for WIMP dark matter. One is a 2 kg 76Ge IGEX detector (RG-2) which has an energy threshold of 4 keV and a low-energy background rate of about 0.3 c/keV/kg/day. The other is a small (234 g) natural abundance Ge detector (COSME), of low energy threshold (2.5 keV) and an energy resolution of 0.4 keV at 10 keV which is looking for WIMPs and for solar axions. The analysis of 73 kg-days of data taken by COSME in a search for solar axions via their photon Primakoff conversion and Bragg scattering in the Ge crystal yields a 95% C.L. limit for the axion-photon coupling g < 2.8 10^-9 GeV^-1. These data, analyzed for WIMP searches provide an exclusion plot for WIMP-nucleon spin-independent interaction which improves previous plots in the low mass region. On the other hand, the exclusion plot derived from the 60 kg-days of data from the RG-2 IGEX detector improves the exclusion limits derived from other ionization (non thermal) germanium detector experiments in the region of WIMP masses from 30 to 100 GeV recently singled out by the reported DAMA annual modulation effect.