Exotic dark matter search with the Majorana Demonstrator

I. J. Arnquist; F. T. Avignone III; A. S. Barabash; C. J. Barton; K. H. Bhimani; E. Blalock; B. Bos; M. Busch; M. Buuck; T. S. Caldwell; Y-D. Chan; C. D. Christofferson; P. -H. Chu; M. L. Clark; C. Cuesta; J. A. Detwiler; Yu. Efremenko; H. Ejiri; S. R. Elliott; G. K. Giovanetti; M. P. Green; J. Gruszko; I. S. Guinn; V. E. Guiseppe; C. R. Haufe; R. Henning; D. Hervas Aguilar; E. W. Hoppe; A. Hostiuc; M. F. Kidd; I. Kim; R. T. Kouzes; T. E. Lannen V; A. Li; A. M. Lopez; J. M. López-Castaño; E. L. Martin; R. D. Martin; R. Massarczyk; S. J. Meijer; S. Mertens; T. K. Oli; G. Othman; L. S. Paudel; W. Pettus; A. W. P. Poon; D. C. Radford; A. L. Reine; K. Rielage; N. W. Ruof; D. C. Schaper; D. Tedeschi; R. L. Varner; S. Vasilyev; J. F. Wilkerson; C. Wiseman; W. Xu; C. -H. Yu; B. X. Zhu

doi:10.1103/physrevlett.132.041001

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arXiv · 2206.10638

Exotic dark matter search with the Majorana Demonstrator

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Abstract

With excellent energy resolution and ultra-low level radiogenic backgrounds, the high-purity germanium detectors in the Majorana Demonstrator enable searches for several classes of exotic dark matter (DM) models. In this work, we report new experimental limits on keV-scale sterile neutrino DM via the transition magnetic moment from conversion to active neutrinos, $\nu_s \rightarrow \nu_a$. We report new limits on fermionic dark matter absorption ($\chi + A \rightarrow \nu + A$) and sub-GeV DM-nucleus 3$\rightarrow$2 scattering ($\chi + \chi + A \rightarrow \phi + A$), and new exclusion limits for bosonic dark matter (axionlike particles and dark photons). These searches utilize the (1--100)-keV low energy region of a 37.5-kg y exposure collected by the Demonstrator between May 2016 and November 2019, using a set of $^{76}$Ge-enriched detectors whose surface exposure time was carefully controlled, resulting in extremely low levels of cosmogenic activation.

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I. J. Arnquist, F. T. Avignone III, A. S. Barabash, C. J. Barton, K. H. Bhimani, E. Blalock, B. Bos, M. Busch, M. Buuck, T. S. Caldwell, Y-D. Chan, C. D. Christofferson, P. -H. Chu, M. L. Clark, C. Cuesta, J. A. Detwiler, Yu. Efremenko, H. Ejiri, S. R. Elliott, G. K. Giovanetti, M. P. Green, J. Gruszko, I. S. Guinn, V. E. Guiseppe, C. R. Haufe, R. Henning, D. Hervas Aguilar, E. W. Hoppe, A. Hostiuc, M. F. Kidd, I. Kim, R. T. Kouzes, T. E. Lannen V, A. Li, A. M. Lopez, J. M. López-Castaño, E. L. Martin, R. D. Martin, R. Massarczyk, S. J. Meijer, S. Mertens, T. K. Oli, G. Othman, L. S. Paudel, W. Pettus, A. W. P. Poon, D. C. Radford, A. L. Reine, K. Rielage, N. W. Ruof, D. C. Schaper, D. Tedeschi, R. L. Varner, S. Vasilyev, J. F. Wilkerson, C. Wiseman, W. Xu, C. -H. Yu, B. X. Zhu. 2022-06-21. Exotic dark matter search with the Majorana Demonstrator. https://doi.org/10.1103/physrevlett.132.041001

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