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• W3159133668 abstract "Directional Dark Matter Detection (DDMD) can open a new signature for Weakly Massive Interacting Particles (WIMPs) Dark Matter. The directional signature provides in addition, an unique way to overcome the neutron and neutrino backgrounds. In order to get the directional signature, the DDM detectors should be sensitive to low nuclear energy recoils in the keV range and have an angular resolution better than 20°. We have performed experiments with low energy (<30keV) ion beam facilities to measure the angular distribution of nuclear recoil tracks in a MIMAC detector prototype. In this paper, we study angular spreads with respect to the electron drift direction (0° incident angle) of Fluorine nuclear tracks in this low energy range, and show nuclear recoil angle reconstruction produced by a monoenergetic neutron field experiment. We find that a high-gain systematic effect leads to a high angular resolution along the electron drift direction. The measured angular distribution is impacted by diffusion, and space charge or ion feedback effects, which can be corrected for by an asymmetry factor observed in the flash-ADC profile. The estimated angular resolution of the 0° incident ion is better than 15° at 10 keV kinetic energy and agrees with the simulations within 20%. As it was not possible to inject ions at angles different from zero with respect to the electric drift field, we have performed experiments with monoenergetic neutrons producing nuclear recoils at all angles. The distributions from the nuclear recoils have been compared with simulated results based on a modified Garfield++ code. Our study shows that protons would be a more adapted target than heavier nuclei for DDMD of light WIMPs. We demonstrate that directional signature from the Galactic halo origin of a Dark Matter WIMP signal is experimentally achievable, with a deep understanding of the operating conditions of a low pressure detector with its diffusion mechanism." @default.
• W3159133668 created "2021-05-10" @default.
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• W3159133668 date "2022-01-01" @default.
• W3159133668 modified "2023-10-06" @default.
• W3159133668 title "Dark Matter Directionality Detection performance of the Micromegas-based <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline id=d1e1479 altimg=si8.svg><mml:mi>μ</mml:mi></mml:math>TPC-MIMAC detector" @default.
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• W3159133668 doi "https://doi.org/10.1016/j.nima.2021.165412" @default.
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