用CsI（Tl）晶体探测器研究弱相互作用大质量粒子与核子相互作用的新极限
New Limits on Interactions between Weakly Interacting Massive Particles and Nucleons Obtained with CsI(Tl) Crystal Detectors
摘要：
本文给出了阳阳地下实验室KIMS CsI（T）探测器阵列中弱相互作用大质量粒子（WIMP）核子散射截面的新极限。用于这些结果的暴露量为24524.3 kg \cdotdays。用脉冲形状鉴别法鉴别了WIMP相互作用产生的反冲核。一个低能量的背景，由于α发射体的晶体表面上的识别和考虑在分析中。检测到的核反冲的数量是一致的零和90%的置信水平上限的WIMP相互作用率设置为电子当量能量从3千电子伏至11千电子伏。3.6-5.8 keV（相当于NaI（T）中的2-4 keV）NR事件率的90%上限为0.0098计数/kg/keV/天，低于DAMA报告的年度调制幅度。这与增强调制幅度的解释不相容，例如非弹性暗物质模型。我们建立了最严格的截面限制自旋相关的WIMP质子弹性散射的WIMP质量大于20 GeV/c2。
英文摘要：
New limits are presented on the cross section for Weakly Interacting Massive Particle (WIMP) nucleon scattering in the KIMS CsI(T) detector array at the Yangyang Underground Laboratory. The exposure used for these results is 24524.3 kg\cdotdays. Nuclei recoiling from WIMP interactions are identified by a pulse shape discrimination method. A low energy background due to alpha emitters on the crystal surfaces is identified and taken into account in the analysis. The detected numbers of nuclear recoils are consistent with zero and 90% confidence level upper limits on the WIMP interaction rates are set for electron equivalent energies from 3 keV to 11 keV. The 90% upper limit of NR event rate for 3.6-5.8 keV corresponding to 2-4 keV in NaI(T) is 0.0098 counts/kg/keV/day which is below the annual modulation amplitude reported by DAMA. This is incompatible with interpretations that enhance the modulation amplitude such as inelastic dark matter models. We establish the most stringent cross section limits on spin-dependent WIMP-proton elastic scattering for the WIMP masses greater than 20 GeV/c2.
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