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Energy loss due to defect creation in solid state detectors

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

Submission summary

Authors (as Contributors): Matti Heikinheimo
Submission information
Preprint link: scipost_202209_00046v1
Data repository: https://github.com/sebsassi/elosssim
Date submitted: 2022-09-22 15:08
Submitted by: Heikinheimo, Matti
Submitted to: SciPost Physics Proceedings
Proceedings issue: 14th International Conference on Identification of Dark Matter
Ontological classification
Academic field: Physics
Specialties:
  • Gravitation, Cosmology and Astroparticle Physics

Abstract

The threshold displacement energy in solid state detector materials varies from several eV to <100 eV. If a stable or long lived defect is created as a result of a nuclear recoil event, some part of the recoil energy is stored in the deformed lattice and is therefore not observable in a phonon detector. Thus, an accurate model of this effect is necessary for precise calibration of the recoil energy measurement in low threshold phonon detectors. Furthermore, the sharpness of the defect creation threshold varies between materials. For a hard material such as diamond, the sharp threshold will cause a sudden onset of the energy loss effect, resulting in a prominent peak in the observed recoil spectrum just below the threshold displacement energy. We describe how this effect can be used to discriminate between nuclear and electron recoils using just the measured recoil spectrum.

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Submission & Refereeing History

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Submission scipost_202209_00046v1 on 22 September 2022

Reports on this Submission

Anonymous Report 1 on 2022-11-6 (Invited Report)

Weaknesses

Small typos.

Report

n this proceeding authors presents results of molecular dynamics simulations of different materials used in direct DM detections and parametric models for the data in order to study the energy loss due to defects in crystals. Great attempt to help in finding an explanation for recently seen excess of events in different experiments.
The manuscript is clearly written and well organised. It is also suitably formatted for publication.
I recommend the manuscript for publication as it is.

  • validity: top
  • significance: top
  • originality: high
  • clarity: high
  • formatting: excellent
  • grammar: excellent

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