Ionization efficiency study for low energy nuclear recoils in germanium

Barker, D.; Wei, Wenzhao; Mei, Dongming; Zhang, C.

doi:10.1016/j.astropartphys.2013.06.010

Cited by 14 publications

(22 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Experimental measurements in Ge are consistent with Lindhard theory down to at least a recoil energy of 254 eV [38][39][40]. We choose the cutoff E y 0 to be at 40 eV, roughly a factor of 2-3 times higher than the minimum energy required for dislocating a Ge atom from its lattice site [41].…”

Section: Ionization Yield In Gementioning

confidence: 67%

Projected sensitivity of the SuperCDMS SNOLAB experiment

Agnese¹,

Anderson²,

Aramaki³

et al. 2017

Phys. Rev. D

Self Cite

301

339

View full text Add to dashboard Cite

SuperCDMS SNOLAB will be a next-generation experiment aimed at directly detecting low-mass particles (with masses ≤ 10 GeV=c 2 ) that may constitute dark matter by using cryogenic detectors of two types (HV and iZIP) and two target materials (germanium and silicon). The experiment is being designed with an initial sensitivity to nuclear recoil cross sections ∼1 × 10 −43 cm 2 for a dark matter particle mass of * Corresponding author. tsaab@ufl.edu PHYSICAL REVIEW D 95, 082002 (2017) 2470-0010=2017=95(8)=082002 (17) 082002-1 © 2017 American Physical Society 1 GeV=c 2 , and with capacity to continue exploration to both smaller masses and better sensitivities. The phonon sensitivity of the HV detectors will be sufficient to detect nuclear recoils from sub-GeV dark matter. A detailed calibration of the detector response to low-energy recoils will be needed to optimize running conditions of the HV detectors and to interpret their data for dark matter searches. Low-activity shielding, and the depth of SNOLAB, will reduce most backgrounds, but cosmogenically produced 3 H and naturally occurring 32 Si will be present in the detectors at some level. Even if these backgrounds are 10 times higher than expected, the science reach of the HV detectors would be over 3 orders of magnitude beyond current results for a dark matter mass of 1 GeV=c 2 . The iZIP detectors are relatively insensitive to variations in detector response and backgrounds, and will provide better sensitivity for dark matter particles with masses ≳5 GeV=c 2 . The mix of detector types (HV and iZIP), and targets (germanium and silicon), planned for the experiment, as well as flexibility in how the detectors are operated, will allow us to maximize the low-mass reach, and understand the backgrounds that the experiment will encounter. Upgrades to the experiment, perhaps with a variety of ultra-low-background cryogenic detectors, will extend dark matter sensitivity down to the "neutrino floor," where coherent scatters of solar neutrinos become a limiting background.

show abstract

Section: Ionization Yield In Gementioning

confidence: 67%

Projected sensitivity of the SuperCDMS SNOLAB experiment

Agnese¹,

Anderson²,

Aramaki³

et al. 2017

Phys. Rev. D

Self Cite

301

339

View full text Add to dashboard Cite

show abstract

“…Some of them try to describe the electronic and nuclear stopping power at low energies as in [239] for ionisation in germanium. This model is verified by a dedicated data-MC comparison of neutron scattering off germanium [255]. In [256][257] and [258], the scintillation and ionisation for liquid noble-gas detector are modelled.…”

Section: Calibration Of the Recoil-energiesmentioning

confidence: 89%

Dark matter direct-detection experiments

Undagoitia

Rauch

2015

J. Phys. G: Nucl. Part. Phys.

389

319

View full text Add to dashboard Cite

Abstract.In the past decades, several detector technologies have been developed with the quest to directly detect dark matter interactions and to test one of the most important unsolved questions in modern physics. The sensitivity of these experiments has improved with a tremendous speed due to a constant development of the detectors and analysis methods, proving uniquely suited devices to solve the dark matter puzzle, as all other discovery strategies can only indirectly infer its existence. Despite the overwhelming evidence for dark matter from cosmological indications at small and large scales, a clear evidence for a particle explaining these observations remains absent. This review summarises the status of direct dark matter searches, focussing on the detector technologies used to directly detect a dark matter particle producing recoil energies in the keV energy scale. The phenomenological signal expectations, main background sources, statistical treatment of data and calibration strategies are discussed.arXiv:1509.08767v2 [physics.ins-det]

show abstract

“…For the last decade, DM experiments have been rejecting irreducible electron recoil backgrounds using the differing yield between nuclear and electronic recoils, often called the quenching factor, utilizing simultaneous measurements of energy in complementary detection channels (see e.g., Refs. [32,33] and Appendix B). For solid-state experiments, the readout typically comprises both a heat (E det ) and charge or light (E e ) signal.…”

Section: Determining Signal Originmentioning

confidence: 99%

Dark matter interpretation of excesses in multiple direct detection experiments

et al. 2020

View full text Add to dashboard Cite

We present a novel unifying interpretation of excess event rates observed in several dark matter directdetection experiments that utilize single-electron threshold semiconductor detectors. Despite their different locations, exposures, readout techniques, detector composition, and operating depths, these experiments all observe statistically significant excess event rates of ∼10 Hz=kg. However, none of these persistent excesses has yet been reported as a dark matter signal because individually, each can be attributed to different well-motivated but unmodeled backgrounds, and taken together, they cannot be explained by dark matter particles scattering elastically off detector nuclei or electrons. We show that these results can be reconciled if the semiconductor detectors are seeing a collective inelastic process, consistent with exciting a plasmon. We further show that plasmon excitation could arise in two compelling dark matter scenarios, both of which can explain rates of existing signal excesses in germanium and, at least at the order of magnitude level, across several single-electron threshold detectors. At least one of these scenarios also yields the correct relic density from thermal freeze-out. Both dark matter scenarios motivate a radical rethinking of the standard interpretations of dark matter-electron scattering from recent experiments.

show abstract

Ionization efficiency study for low energy nuclear recoils in germanium

Cited by 14 publications

References 24 publications

Projected sensitivity of the SuperCDMS SNOLAB experiment

Projected sensitivity of the SuperCDMS SNOLAB experiment

Dark matter direct-detection experiments

Dark matter interpretation of excesses in multiple direct detection experiments

Contact Info

Product

Resources

About