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Direct detection of MeV-scale dark matter utilizing germanium internal amplification for the charge created by the ionization of impurities

Mei, D.-M. ; Wang, G.-J. ; Mei, H. ; Yang, G. ; Liu, J. ; Wagner, M. ; Panth, R. ; Kooi, K. ; Yang, Y.-Y. ; Wei, W.-Z.

The European physical journal. C, Particles and fields, 2018-03, Vol.78 (3), p.1-12, Article 187 [Periódico revisado por pares]

Berlin/Heidelberg: Springer Berlin Heidelberg

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Título:
Direct detection of MeV-scale dark matter utilizing germanium internal amplification for the charge created by the ionization of impurities
Autor: Mei, D.-M. ; Wang, G.-J. ; Mei, H. ; Yang, G. ; Liu, J. ; Wagner, M. ; Panth, R. ; Kooi, K. ; Yang, Y.-Y. ; Wei, W.-Z.
Assuntos: Amplification ; Astronomy ; Astrophysics and Cosmology ; Cross sections ; Current carriers ; Dark matter ; Detection equipment ; Elementary Particles ; Energy (Physics) ; Germanium ; Hadrons ; Heavy Ions ; Helium ; Impurities ; Innovations ; Ion charge ; Ionization ; Measurement Science and Instrumentation ; New technology ; Nuclear Energy ; Nuclear Physics ; Particle physics ; Physics ; Physics and Astronomy ; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS ; Quantum Field Theories ; Quantum Field Theory ; Regular Article - Experimental Physics ; Sensitivity analysis ; Sensors ; String Theory
É parte de: The European physical journal. C, Particles and fields, 2018-03, Vol.78 (3), p.1-12, Article 187
Notas: USDOE
SC0004768; FG02-10ER46709
Descrição: Light, MeV-scale dark matter (DM) is an exciting DM candidate that is undetectable by current experiments. A germanium (Ge) detector utilizing internal charge amplification for the charge carriers created by the ionization of impurities is a promising new technology with experimental sensitivity for detecting MeV-scale DM. We analyze the physics mechanisms of the signal formation, charge creation, charge internal amplification, and the projected sensitivity for directly detecting MeV-scale DM particles. We present a design for a novel Ge detector at helium temperature ( ∼ 4 K) enabling ionization of impurities from DM impacts. With large localized E-fields, the ionized excitations can be accelerated to kinetic energies larger than the Ge bandgap at which point they can create additional electron–hole pairs, producing intrinsic amplification to achieve an ultra-low energy threshold of ∼ 0.1 eV for detecting low-mass DM particles in the MeV scale. Correspondingly, such a Ge detector with 1 kg-year exposure will have high sensitivity to a DM-nucleon cross section of ∼ 5 × 10 - 45 cm 2 at a DM mass of ∼ 10 MeV/c 2 and a DM-electron cross section of ∼ 5 × 10 - 46 cm 2 at a DM mass of ∼ 1 MeV/c 2 .
Editor: Berlin/Heidelberg: Springer Berlin Heidelberg
Idioma: Inglês

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Direct detection of MeV-scale dark matter utilizing germanium internal amplification for the charge created by the ionization of impurities

Mei, D.-M. ; Wang, G.-J. ; Mei, H. ; Yang, G. ; Liu, J. ; Wagner, M. ; Panth, R. ; Kooi, K. ; Yang, Y.-Y. ; Wei, W.-Z.

Berlin/Heidelberg: Springer Berlin Heidelberg

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