ZEPLIN-III暗物质搜索实验的第一次科学运行结果
Results from the First Science Run of the ZEPLIN-III Dark Matter Search Experiment
摘要：
位于博尔比的帕尔默地下实验室的ZEPLIN-III实验使用一个12公斤的两相氙时间投影室来寻找可能解释银河系暗物质的弱相互作用大质量粒子（WIMP）。探测器测量液体中相互作用的辐射产生的闪烁和电离，以区分WIMP预期的核反冲和低至~ 10 keV核反冲能量的电子反冲背景信号。对2008年2月27日至2008年5月20日期间获得的847kg.days数据的分析排除了在55 GeV/c2下大于8.1x10（-8）pb的WIMP-核子弹性散射自旋无关截面，置信限为90%。它还表明，两相氙技术是能够更好地区分电子和核反冲在低能量比以前实现的其他氙为基础的实验。
英文摘要：
The ZEPLIN-III experiment in the Palmer Underground Laboratory at Boulby uses a 12kg two-phase xenon time projection chamber to search for the weakly interacting massive particles (WIMPs) that may account for the dark matter of our Galaxy. The detector measures both scintillation and ionisation produced by radiation interacting in the liquid to differentiate between the nuclear recoils expected from WIMPs and the electron recoil background signals down to ~10keV nuclear recoil energy. An analysis of 847kg.days of data acquired between February 27th 2008 and May 20th 2008 has excluded a WIMP-nucleon elastic scattering spin-independent cross-section above 8.1x10(-8)pb at 55GeV/c2 with a 90% confidence limit. It has also demonstrated that the two-phase xenon technique is capable of better discrimination between electron and nuclear recoils at low-energy than previously achieved by other xenon-based experiments.
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