用CsI(Tl)晶体探测器寻找低质量暗物质
Search for Low-Mass Dark Matter with CsI(Tl) Crystal Detectors
摘要:
我们提出了一个搜索低质量($\leq 20 GeV/c^{2}$)弱相互作用大质量粒子(WIMPs),强有力的候选人的暗物质粒子,使用低背景CsI(Tl)的韩国不可见的质量搜索(KIMS)实验的探测器阵列。利用24,324.3kg $\cdot$天的总数据曝光量,我们寻找了由WIMP-核弹性散射产生的核反冲产生的WIMP相互作用信号,其可见能量为2 - 4keV。观测到的候选事件的能量分布与零信号一致,WIMP-质子自旋无关相互作用的上限设定为90%的置信水平。所观察到的限制拒绝大部分的低质量区域的参数空间有利于DAMA年度调制信号。
英文摘要:
We present a search for low-mass ($\leq 20 GeV/c^{2}$) weakly interacting massive particles(WIMPs), strong candidates of dark matter particles,using the low-background CsI(Tl) detector array of the Korea Invisible Mass Search (KIMS) experiment. With a total data exposure of 24,324.3kg$\cdot$days,we search for WIMP interaction signals produced by nuclei recoiling from WIMP-nuclear elastic scattering with visible energies between 2 and 4keV. The observed energy distribution of candidate events is consistent with null signals, and upper limits of the WIMP-proton spin-independent interaction are set with a 90% confidence level. The observed limit rejects most of the low mass region of parameter space favored by the DAMA annual modulation signal.
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