Anisotropic ionization threshold and directional sensitivity in solid state DM detectors

Matti Heikinheimo; Sebastian Sassi; Kimmo Tuominen; Kai Nordlund; Nader Mirabolfathi

doi:10.21468/SciPostPhysProc.12.020

Anisotropic ionization threshold and directional sensitivity in solid state DM detectors

Matti Heikinheimo, Sebastian Sassi, Kimmo Tuominen, Kai Nordlund, Nader Mirabolfathi

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Scientific › peer-review

Abstract

The threshold displacement energy for nuclear recoils depends strongly on the direction of the recoiling nucleus with respect to the crystal lattice. Assuming that similar dependence holds for the ionization threshold for low energy nuclear recoils, we explore the consequences of the resulting directional dependence of the observable event rate in ionization detectors. For low mass dark matter, this effect leads to a daily modulation in the event rate. We discuss how this effect can be utilized to separate the DM signal from the solar neutrino background and how the structure of the modulation signal can be used to identify the type of the DM-nucleon coupling.

Original language	English
Title of host publication	14th International Conference on Identification of Dark Matter (IDM2022)
Number of pages	5
Publisher	SCIPOST FOUNDATION
Publication date	3 Jul 2023
DOIs	https://doi.org/10.21468/SciPostPhysProc.12.020
Publication status	Published - 3 Jul 2023
MoE publication type	A4 Article in conference proceedings
Event	14th International Conference on Identification of Dark Matter - Technical University Vienna, Vienna, Austria Duration: 18 Jul 2022 → 22 Jul 2022

Publication series

Name	SciPost Physics Proceedings
Publisher	The SciPost Foundation
Number	020
Volume	12
ISSN (Electronic)	2666-4003

Fields of Science

114 Physical sciences

Access to Document

10.21468/SciPostPhysProc.12.020Licence: CC BY

SciPostPhysProc_12_020Final published version, 1.67 MBLicence: CC BY

Cite this

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title = "Anisotropic ionization threshold and directional sensitivity in solid state DM detectors",

abstract = "The threshold displacement energy for nuclear recoils depends strongly on the direction of the recoiling nucleus with respect to the crystal lattice. Assuming that similar dependence holds for the ionization threshold for low energy nuclear recoils, we explore the consequences of the resulting directional dependence of the observable event rate in ionization detectors. For low mass dark matter, this effect leads to a daily modulation in the event rate. We discuss how this effect can be utilized to separate the DM signal from the solar neutrino background and how the structure of the modulation signal can be used to identify the type of the DM-nucleon coupling.",

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Heikinheimo, M , Sassi, S , Tuominen, K , Nordlund, K & Mirabolfathi, N 2023, Anisotropic ionization threshold and directional sensitivity in solid state DM detectors. in 14th International Conference on Identification of Dark Matter (IDM2022) . SciPost Physics Proceedings, no. 020, vol. 12, SCIPOST FOUNDATION, 14th International Conference on Identification of Dark Matter, Vienna, Austria, 18/07/2022. https://doi.org/10.21468/SciPostPhysProc.12.020

Anisotropic ionization threshold and directional sensitivity in solid state DM detectors. / Heikinheimo, Matti ; Sassi, Sebastian ; Tuominen, Kimmo et al.
14th International Conference on Identification of Dark Matter (IDM2022) . SCIPOST FOUNDATION, 2023. (SciPost Physics Proceedings; Vol. 12, No. 020).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Scientific › peer-review

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AU - Mirabolfathi, Nader

PY - 2023/7/3

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N2 - The threshold displacement energy for nuclear recoils depends strongly on the direction of the recoiling nucleus with respect to the crystal lattice. Assuming that similar dependence holds for the ionization threshold for low energy nuclear recoils, we explore the consequences of the resulting directional dependence of the observable event rate in ionization detectors. For low mass dark matter, this effect leads to a daily modulation in the event rate. We discuss how this effect can be utilized to separate the DM signal from the solar neutrino background and how the structure of the modulation signal can be used to identify the type of the DM-nucleon coupling.

AB - The threshold displacement energy for nuclear recoils depends strongly on the direction of the recoiling nucleus with respect to the crystal lattice. Assuming that similar dependence holds for the ionization threshold for low energy nuclear recoils, we explore the consequences of the resulting directional dependence of the observable event rate in ionization detectors. For low mass dark matter, this effect leads to a daily modulation in the event rate. We discuss how this effect can be utilized to separate the DM signal from the solar neutrino background and how the structure of the modulation signal can be used to identify the type of the DM-nucleon coupling.

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