Looking for light Dark Matter with CCDs in the DAMIC experiment
Description
A large number of astrophysical and cosmological observations promote the fact that 80% of the matter in the Universe is made of an unknown dark matter weakly interacting with the ordinary matter, the dark matter. However little is known about it, and its nature remains one of the unknown of modern physics. Nowadays the vast majority of the direct detection dark matter experiments didn't detect anything. The Dark Matter In CCDs (DAMIC) experiment at SNOLAB is one of them, and uses Charged Coupled Devices (CCDs), silicon semi-conductors, as detectors. My work within the DAMIC collaboration was mainly focused on the construction of the radioactive background model with the GEANT4 tool kit. To start we will introduce the DAMIC at SNOLAB experiment and present the simulation of the experiment, from the generation of primary particle to the simulation of the detector behavior to the energy deposit of the particles simulated. Then I will show you the origins and characteristics of the different radioactive isotopes present in the experiment, information that we retrieved from papers, screening measurement and analysis. To finish I will present the radioactive background model coming from the fit of the simulations to the data and the sensibility of the DAMIC experiment. (author)
Abstract (French)
De nombreuses observations astrophysiques et cosmologiques tendent a favoriser le fait que 80% de la matiere de l'Univers est constitue d'une matiere inconnue et interagissant peu avec a la matiere ordinaire, la matiere sombre. Cependant sa nature reste une des inconnues de la physique moderne. Actuellement la vaste de majorite des experiences de detection directe de matiere sombre n'ont encore rien detecte. L'experience Dark Matter In CCDs (DAMIC) a SNOLAB est l'une d'entre elles et utilise des Charged Coupled Devices (CCDs, semi-conducteurs en silicium, comme detecteur. Mon travail au sein de la collaboration DAMIC a ete centre sur la production d'un modele de bruit de fond radioactif a l'aide de l'outil GEANT4. On commencera par introduire l'experience DAMIC a SNOLAB pour presenter la simulation de l'experience, de la generation des isotopes radioactifs a la simulation de la reponse du detecteur aux depots d'energies des particules simulees. J'exposerai ensuite les origines et caracteristiques des differents isotopes presents dans l'experience, informations que l'on a obtenues grace a des mesures dites de screening, des publications et analyses. Pour terminer je presenterai le modele de bruit de fond radioactif issu de l'ajustement des simulations au donnees et la sensibilite de l'experience DAMIC. (auteur)
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Additional details
Additional titles
- Original title (French)
- Recherche de matiere sombre legere avec des CCDs de l'experience DAMIC a Snolab
Publishing Information
- Imprint Pagination
- 177 p.
- Report number
- FRNC-TH--11588
INIS
- Country of Publication
- France
- Country of Input or Organization
- France
- INIS RN
- 52035831
- Subject category
- S46: INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; S79: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;
- Resource subtype / Literary indicator
- Thesis
- Descriptors DEI
- BACKGROUND NOISE; BACKGROUND RADIATION; CHARGE-COUPLED DEVICES; COMPUTERIZED SIMULATION; DARK CURRENT; G CODES; NONLUMINOUS MATTER; SI SEMICONDUCTOR DETECTORS; WIMPS
- Descriptors DEC
- COMPUTER CODES; CURRENTS; ELECTRIC CURRENTS; ELEMENTARY PARTICLES; LEAKAGE CURRENT; MATTER; MEASURING INSTRUMENTS; NOISE; POSTULATED PARTICLES; RADIATION DETECTORS; RADIATIONS; SEMICONDUCTOR DETECTORS; SEMICONDUCTOR DEVICES; SIMULATION
Optional Information
- Notes
- 126 refs.; Available from the INIS Liaison Officer for France, see the INIS website for current contact and E-mail addresses