Nuclear emulsion is a well-known detector type proposed also for the directional detection of dark matter. In this paper, we study one of the most important properties of direction-sensitive detectors: the preservation by nuclear recoils of the direction of impinging dark matter particles. For nuclear emulsion detectors, it is the first detailed study where a realistic nuclear recoil energy distribution with all possible recoil atom types is exploited. Moreover, for the first time we study the granularity effect on the emulsion detector directional performance. As well as we compare nuclear emulsion with other directional detectors: in terms of direction preservation nuclear emulsion outperforms the other detectors for WIMP masses above 100 GeV/c².

核乳液是一种众所周知的探测器类型，也被提议用于定向探测暗物质。在本文中，我们研究了方向敏感探测器最重要的特性之一：通过核反冲来保存撞击暗物质粒子的方向。对于核乳液探测器，这是第一个详细研究，其中利用了所有可能的反冲原子类型的真实核反冲能量分布。此外，我们首次研究了粒度对乳剂检测仪定向性能的影响。以及我们将核乳液与其他定向探测器进行比较：就方向保持而言，核乳液在 100 GeV/c ²以上的 WIMP 质量方面优于其他探测器。