gSeaGen code by KM3NeT: An efficient tool to propagate muons simulated with CORSIKA

The KM3NeT Collaboration has tackled a common challenge faced by the astroparticle physics community, namely adapting the experiment-specific simulation software to work with the CORSIKA air shower simulation output. The proposed solution is an extension of the open source code gSeaGen, which allows the transport of muons generated by CORSIKA to a detector of any size at an arbitrary depth. The gSeaGen code was not only extended in terms of functionality but also underwent a thorough redesign of the muon propagation routine, resulting in a more accurate and efficient simulation. This paper presents the capabilities of the new gSeaGen code as well as prospects for further developments.KM3NeT合作组（KM3NeT Collaboration）攻克了天体粒子物理学界普遍面临的一项共性难题：使实验专属的模拟软件适配并兼容CORSIKA大气簇射模拟程序的输出结果。本次提出的解决方案是对开源代码gSeaGen的扩展，该扩展可将CORSIKA生成的μ子（muon）输运至任意深度、任意尺寸的探测器中。gSeaGen代码不仅在功能层面得到拓展，还对μ子输运流程进行了全面重构，最终使得模拟的精度与效率均得到显著提升。本文介绍了新版gSeaGen代码的各项功能特性，以及其后续研发的前景展望。