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primary topic: Coherent Elastic Antineutrino-Nucleus Scattering with CONUS+: Precision Background Modeling and Signal Extraction

Coherent Elastic Antineutrino-Nucleus Scattering with CONUS+: Precision Background Modeling and Signal Extraction
type: Article
abstract: Coherent elastic neutrino-nucleus scattering (CE$\nu$NS) is a Standard Model process which had long evaded observation at reactor energies due to the tiny recoil energies and challenging background conditions involved. The CONUS+ experiment is a dedicated CE$\nu$NS experiment operating four high-purity germanium detectors inside a massive composite shield located at the commercial nuclear power plant KKL in Leibstadt, Switzerland. The first physics run of the experiment (run 1), which lasted from November 2023 to August 2024 and collected 326.8 kg d of reactor on and 59.7 kg d of reactor off data, yielded the first measurement of CE$\nu$NS for reactor antineutrinos. This thesis first presents the full decomposition and modelling of the background spectra of the CONUS+ detectors in both reactor on and off data taking periods in run 1. The establishment of such a background model is a crucial step towards the full understanding of the measured data and allows the extraction of the CE$\nu$NS signal in a full likelihood analysis, also presented in this work. The findings of this thesis therefore directly enabled and provided the first successful measurement of the interaction at reactor site. \newline Monte Carlo simulations show that the dominant background sources of the experiment are cosmic rays (muons and neutrons), contributing approximately 70 - 80$\%$ of the background rate below 1 keV. At larger energies above the region of interest of the experiment, other sources like the influence of radon in the detector chamber and $^{210}$Pb become more dominant. Reactor-correlated backgrounds are found to be subdominant. The differences in the measured reactor on and off spectra of the detectors were able to be explained by reduced cosmic ray fluxes in the room due to an increased overburden and changes in the radon concentration during the reactor off measurement. The full background model correctly describes the measured detector spectra in both reactor on and off meas…
date: 2025
author list: authors
type: EPrint
type: DoctoralThesisEPrint
is part of: repository
has document: Coherent Elastic Antineutrino-Nucleus Scattering with CONUS+: Precision Background Modeling and Signal Extraction (PDF)
has document: Coherent Elastic Antineutrino-Nucleus Scattering with CONUS+: Precision Background Modeling and Signal Extraction (Other)
subject: 530 Physik

Coherent Elastic Antineutrino-Nucleus Scattering with CONUS+: Precision Background Modeling and Signal Extraction (PDF)
type: Document
has file: NicolaAckermann_PhD_New.pdf
has part: NicolaAckermann_PhD_New.pdf

Nicola Alain Ackermann
type: Person
given name: Nicola Alain
family name: Ackermann

Coherent Elastic Antineutrino-Nucleus Scattering with CONUS+: Precision Background Modeling and Signal Extraction (Other)
type: Document
is version of: Coherent Elastic Antineutrino-Nucleus Scattering with CONUS+: Precision Background Modeling and Signal Extraction (PDF)
is volatile version of: Coherent Elastic Antineutrino-Nucleus Scattering with CONUS+: Precision Background Modeling and Signal Extraction (PDF)
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primary topic: Coherent Elastic Antineutrino-Nucleus Scattering with CONUS+: Precision Background Modeling and Signal Extraction

530 Physik
type: Concept
preferred label: 530 Physics @en