暗物质与原子核的非弹性散射用于直接探测

中文摘要 AI 辅助

我们研究了暗物质直接探测中WIMP-原子核散射的核响应，特别关注$^{129}$Xe和$^{131}$Xe同位素的非弹性通道。我们的推广同时包含了弹性散射和非弹性散射通道。通过对有效算符进行多极展开，角动量、宇称和时间反演选择定则能够有效地确定允许的跃迁。我们没有采用核壳层模型，而是使用最先进的相对论组态相互作用密度泛函理论来计算核响应函数，该方法更适合于诸如氙同位素之类的重核。对于某些相互作用算符，非弹性贡献可以与弹性贡献相当，有些甚至能高出三个数量级。此外，较高的激发核态可以具有与第一激发态相当的信号速率。我们将我们的结果与核壳层模型计算进行了比较。这些差异将对解释暗物质直接探测搜索产生显著影响。

英文摘要

We investigate the nuclear responses for the WIMP-nucleus scattering in the dark matter direct detection with particular emphasis on the inelastic channel for the $^{129}$Xe and $^{131}$Xe isotopes. Our generalization incorporates both the elastic and inelastic scattering channels. With multipole expansion of the effective operators, the angular momentum, parity and time-reversal selection rules can effectively determine the allowed transitions. Instead of the nuclear shell model, we use the state-of-the-art relativistic configuration-interaction density functional theory, which is more suitable for heavy nuclei such as xenon isotopes, to calculate the nuclear response functions. For certain interaction operators, the inelastic contribution can be comparable as its elastic counterpart and some can even dominate by up to three orders of magnitude. Additionally, the higher excited nuclear states can have comparable signal rate as the first excited states. We compare our results with the nuclear shell model calculation. The differences would have significant effects for interpreting the dark matter direct detection searches.

发表机构

• State Key Laboratory of Dark Matter Physics, Tsung-Dao Lee Institute & School of Physics and Astronomy, Shanghai Jiao Tong University（上海交通大学物理与天文学院、暗物质物理国家重点实验室、李政道研究所）
• Key Laboratory for Particle Astrophysics and Cosmology (MOE) & Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai Jiao Tong University（上海交通大学粒子天体物理与宇宙学教育部重点实验室、上海粒子物理与宇宙学重点实验室）
• School of Physics, Beihang University（北京航空航天大学物理学院）

机构由 AI 辅助整理，请以论文原文为准。

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49 pages, 5 figures, 6 tables