Cui Xiangyi, Abdukerim Abdusalam, Bo Zihao, Chen Wei, Chen Xun, Chen Yunhua, Cheng Chen, Cheng Yunshan, Fan Yingjie, Fang Deqing, Fu Changbo, Fu Mengting, Geng Lisheng, Giboni Karl, Gu Linhui, Guo Xuyuan, Han Ke, He Changda, He Jinrong, Huang Di, Huang Yanlin, Huang Zhou, Hou Ruquan, Ji Xiangdong, Ju Yonglin, Li Chenxiang, Li Mingchuan, Li Shu, Li Shuaijie, Lin Qing, Liu Jianglai, Lu Xiaoying, Luo Lingyin, Ma Wenbo, Ma Yugang, Mao Yajun, Meng Yue, Shaheed Nasir, Ning Xuyang, Qi Ningchun, Qian Zhicheng, Ren Xiangxiang, Shang Changsong, Shen Guofang, Si Lin, Sun Wenliang, Tan Andi, Tao Yi, Wang Anqing, Wang Meng, Wang Qiuhong, Wang Shaobo, Wang Siguang, Wang Zhou, Wang Wei, Wang Xiuli, Wu Mengmeng, Wu Weihao, Xia Jingkai, Xiao Mengjiao, Xiao Xiang, Xie Pengwei, Yan Binbin, Yan Xiyu, Yang Jijun, Yang Yong, Yu Chunxu, Yuan Jumin, Yuan Ying, Zhang Dan, Zhang Minzhen, Zhang Peng, Zhang Tao, Zhao Li, Zheng Qibin, Zhou Jifang, Zhou Ning, Zhou Xiaopeng, Zhou Yong, Ge Shao-Feng, Yuan Qiang
Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 200240, China.
School of Physics and Astronomy, Shanghai Jiao Tong University, MOE Key Laboratory for Particle Astrophysics and Cosmology, Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai 200240, China.
Phys Rev Lett. 2022 Apr 29;128(17):171801. doi: 10.1103/PhysRevLett.128.171801.
We report a novel search for the cosmic-ray boosted dark matter using the 100 tonne·day full dataset of the PandaX-II detector located at the China Jinping Underground Laboratory. With the extra energy gained from the cosmic rays, sub-GeV dark matter particles can produce visible recoil signals in the detector. The diurnal modulations in rate and energy spectrum are utilized to further enhance the signal sensitivity. Our result excludes the dark matter-nucleon elastic scattering cross section between 10^{-31} and 10^{-28} cm^{2} for dark matter masses from 0.1 MeV/c^{2} to 0.1 GeV/c^{2}, with a large parameter space previously unexplored by experimental collaborations.
我们报告了一项利用位于中国锦屏地下实验室的熊猫X-II探测器100吨·天的完整数据集对宇宙射线增强暗物质进行的全新搜寻。借助从宇宙射线获得的额外能量，亚GeV暗物质粒子能够在探测器中产生可见的反冲信号。利用速率和能谱中的日调制来进一步提高信号灵敏度。我们的结果排除了暗物质质量从0.1 MeV/c²至0.1 GeV/c²时，暗物质与核子弹性散射截面在10⁻³¹至10⁻²⁸ cm²之间的情况，此前实验合作尚未探索过如此大的参数空间。
