Final analysis and results of the Phase II SIMPLE dark matter search.
Final analysis and results of the Phase II SIMPLE dark matter search.
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DOI：
10.1103/physrevlett.108.201302
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发表时间：
2011-06
影响因子：
8.6
通讯作者：
M. Felizardo;T. Girard;T. Morlat;A. C. Fernandes;A. Ramos;J. Marques;A. Kling;J. Puibasset;M. Auguste;D. Boyer;A. Cavaillou;J. Poupeney;C. Sudre;H. Miley;R. Payne;F. P. Carvalho;M. Prudencio;A. Gouveia;R. Marques
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作者：
M. Felizardo;T. Girard;T. Morlat;A. C. Fernandes;A. Ramos;J. Marques;A. Kling;J. Puibasset;M. Auguste;D. Boyer;A. Cavaillou;J. Poupeney;C. Sudre;H. Miley;R. Payne;F. P. Carvalho;M. Prudencio;A. Gouveia;R. Marques
我们报告了第二阶段简单测量的最终结果，包括两个运行阶段，每个阶段15个过热液滴探测器，第二阶段包括改进的中子屏蔽。这些分析包括改进的信号分析，以及基于对以前报道的单色中子辐射的重新分析而修订的成核效率。在弱相互作用大质量粒子(WIMP)质子相互作用的自旋相关区段，综合结果得到σp=5.7x10(-3)PB的等高线最小值为35GeV/c2，这是迄今为止对mw}≤60GeV/c2最具限制性的直接搜索实验，并首次与以前间接获得的结果重叠。在与自旋无关的区域，在35GeV/c2下获得了最小的4.7×10(-6)PB，排除轮廓对当前感兴趣的轻质量WIMP区域的很大一部分构成了挑战。
We report the final results of the Phase II SIMPLE measurements, comprising two run stages of 15 superheated droplet detectors each, with the second stage including an improved neutron shielding. The analyses include a refined signal analysis, and revised nucleation efficiency based on a reanalysis of previously reported monochromatic neutron irradiations. The combined results yield a contour minimum of σp=5.7×10(-3) pb at 35 GeV/c2 in the spin-dependent sector of weakly interacting massive particle (WIMP) proton interactions, the most restrictive to date for MW}≤60 GeV/c2 from a direct search experiment and overlapping, for the first time, with results previously obtained only indirectly. In the spin-independent sector, a minimum of 4.7×10(-6) pb at 35 GeV/c2 is achieved, with the exclusion contour challenging a significant part of the light mass WIMP region of current interest.