Dark matter direct detection experiments mostly operate at deep underground laboratories. It is necessary to consider shielding effect of the Earth, especially for dark matter particles interacting with a large cross section. We analyzed and simulated the Earth shielding effect for dark matter at the China Jinping Underground Laboratory (CJPL) with a simulation package, CJPL Earth Shielding Simulation code (CJPL_ESS), which is applicable to other underground locations. The further constraints on the $\mathrm{<ruby><rb>\chi </rb><rt>かい</rt></ruby>}\text{−}\mathrm{N}$ cross section exclusion regions are derived based on the studies with CDEX experiment data.

• Received 23 November 2021
• Accepted 2 February 2022

DOI:https://doi.org/10.1103/PhysRevD.105.052005

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Published by the American Physical Society