The DAMA/LIBRA signal: an induced modulation effect?

arXiv - PHYS - High Energy Physics - Experiment Pub Date : 2024-08-16 DOI:arxiv-2408.08697

R. S. James, K. Rule, E. Barberio, V. U. Bashu, L. J. Bignell, I. Bolognino, G. Brooks, S. S. Chhun, F. Dastgiri, A. R. Duffy, M. Froehlich, T. M. A. Fruth, G. Fu, G. C. Hill, K. Janssens, S. Kapoor, G. J. Lane, K. T. Leaver, P. McGee, L. J. McKie, P. C. McNamara, J. McKenzie, W. J. D. Melbourne, M. Mews, L. J. Milligan, J. Mould, F. Nuti, F. Scutti, Z. Slavkovska, N. J. Spinks, O. Stanley, A. E. Stuchbery, B. Suerfu, G. N. Taylor, P. Urquijo, A. G. Williams, Y. Xing, Y. Y. Zhong, M. J. Zurowski

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Abstract

The persistence of the DAMA/LIBRA (DAMA) modulation over the past two decades has been a source of great contention within the dark matter community. The DAMA collaboration reports a persistent, modulating event rate within their setup of NaI(Tl) scintillating crystals at the INFN Laboratori Nazionali del Gran Sasso (LNGS) underground laboratory. A recent work alluded that this signal could have arisen due to an analysis artefact, caused by DAMA not accounting for time variation of decaying background radioisotopes in their analysis procedure. In this work, we examine in detail this 'induced modulation' effect, arguing that a number of aspects of the DAMA signal are incompatible with an induced modulation arising from decays of background isotopes over the lifetime of the experiment. Using a toy model of the DAMA/LIBRA experiment, we explore the induced modulation effect under different variations of the activities of the relevant isotopes - namely, $^3$H and $^{210}$Pb - highlighting the various inconsistencies between the resultant toy datasets and the DAMA signal. We stress the importance of the SABRE experiment, whose goal is to unambiguously test for the presence of such a modulating signal in an experiment using the same target material and comparable levels of background.

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DAMA/LIBRA 信号：诱导调制效应？

过去二十年来，DAMA/LIBRA（DAMA）调制的持续性一直是暗物质界争论的焦点。DAMA 合作组织报告说，他们在 INFN Laboratori Nazionali delGran Sasso（LNGS）地下实验室安装的 NaI（Tl）闪烁晶体中发现了持续的调制事件率。最近的一项工作暗示，这一信号可能是由于 DAMA 在分析程序中没有考虑衰变背景放射性同位素的时间变化而造成的分析误差。在这项工作中，我们详细研究了这种 "诱导调制 "效应，认为 DAMA 信号的许多方面都与实验寿命期间背景同位素衰变引起的诱导调制不相容。我们利用 DAMA/LIBRA 实验的玩具模型，探讨了在相关同位素（即 $^3$H 和 $^{210}$Pb ）活度的不同变化情况下的诱导调制效应，强调了由此产生的数据集与 DAMA 信号之间的各种不一致之处。我们强调了 SABRE 实验的重要性，该实验的目标是在使用相同目标材料和可比背景水平的实验中明确检验是否存在这种调制信号。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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arXiv - PHYS - High Energy Physics - Experiment

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