Department of Physics, California Institute of Technology, Pasadena, California 91125, USA.
Phys Rev Lett. 2009 Oct 2;103(14):141802. doi: 10.1103/PhysRevLett.103.141802. Epub 2009 Oct 1.
We report on the first axion search results from the Cryogenic Dark Matter Search (CDMS) experiment at the Soudan Underground Laboratory. An energy threshold of 2 keV for electron-recoil events allows a search for possible solar axion conversion into photons or local galactic axion conversion into electrons in the germanium crystal detectors. The solar axion search sets an upper limit on the Primakov coupling g(agammagamma) of 2.4x10(-9) GeV-1 at the 95% confidence level for an axion mass less than 0.1 keV/c2. This limit benefits from the first precise measurement of the absolute crystal plane orientations in this type of experiment. The galactic axion search analysis sets a world-leading experimental upper limit on the axioelectric coupling g(aee) of 1.4x10(-12) at the 90% confidence level for an axion mass of 2.5 keV/c2.
我们报告了来自 Cryogenic Dark Matter Search（CDMS）实验在 Soudan 地下实验室的首个轴子搜索结果。对于电子反冲事件，能量阈值为 2 keV，这允许在锗晶体探测器中搜索太阳轴子可能转换为光子或局部银河轴子转换为电子。太阳轴子搜索在小于 0.1 keV/c2 的轴子质量下，将 Primakov 耦合 g(agammagamma)的上限设定为 2.4x10(-9) GeV-1，置信水平为 95%。该限制得益于此类实验中首次对绝对晶体平面取向的精确测量。银河轴子搜索分析在 2.5 keV/c2 的轴子质量下，将轴电耦合 g(aee)的世界领先实验上限设定为 1.4x10(-12)，置信水平为 90%。
