74,094 research outputs found
KATRIN design report 2004
Get PDFNach dem KATRIN Letter of Intent (LoI) von 2001 und dem Addendum zum LoI von 2002 gibt dieser Design Report 2004 einen detaillierten Überblick über das KATRIN Experiment in seiner Aufbauphase inklusive der Testmessungen erster Komponenten. Im ersten Teil wird der aktuelle Status der Neutrinophysik mit Hinblick auf direkte und indirekte Suchen nach der Neutrinomasse kritisch dargelegt. Die Auswirkungen des KATRIN Experiments werden beschrieben und mit den Erkenntnissen aus kosmologischen und teilchenphysikalischen Experimenten verglichen.
In diesem Bericht werden weiterhin die wesentlichen physikalischen Anforderungen an das KATRIN Experiment wie auch die technischen Realisierungen vorgestellt. Im Vergleich zum LoI konnte eine wesentliche Steigerung der KATRIN Sensitivität auf die Neutrinomasse erzielt werden. Diese erreicht nun einen Wert von m(ve) = 0.2 eV (90% C.L.), was einem Entdeckungspotenzial von 5 σ für eine Masse von m(ve) = 0:35 eV entspricht. Diese optimierten Erwartungswerte ergeben sich aus detaillierten Analysen der zu erwartenden systematischen und statistischen Unsicherheiten
KATRIN background due to surface radioimpurities
Get PDFInternational audienceThe goal of the KArlsruhe TRItrium Neutrino (KATRIN) experiment is the determination of the effective electron antineutrino mass with a sensitivity of 0.2eV/c2 at 90% C.L.11C.L. - confidence level.. This goal can only be achieved with a very low background level in the order of 10mcps22mcps - milli count per second. in the detector region of interest. A possible background source are α-decays on the inner surface of the KATRIN Main Spectrometer. Rydberg atoms, produced in sputtering processes accompanying the α-decays, are not influenced by electric or magnetic fields and freely propagate inside the vacuum of the Main Spectrometer. Here, they can be ionized by thermal radiation and the released electrons directly contribute to the KATRIN background. Two α-sources, 223Ra and 228Th, were installed at the Main Spectrometer with the purpose of temporarily increasing the background in order to study α-decay induced background processes. In this paper, we present a possible background generation mechanism and measurements performed with these two radioactive sources. Our results show a clear correlation between α-activity on the inner spectrometer surface and background from the volume of the spectrometer. Two key characteristics of the Main Spectrometer background – the dependency on the inner electrode offset potential, and the radial distribution – could be reproduced with this artificially induced background. These findings indicate a high contribution of α-decay induced events to the residual KATRIN background
Katrin Langewiesche
No full textKatrin Langewiesche s'intéresse aux liens entre photographie et sciences sociales. Elle a publié avec A. Attané et F. Pourcel une étude anthropo-photographique sur la mouvance néo-rurale en France (Néo-ruraux – Vivre autrement, 2004). Cet intérêt épistémologique pour les images se poursuit sur des terrains africains où elle travaille actuellement sur des mouvements musulmans et chrétiens transnationaux qui se déploient entre l'Afrique et l'Europe. Elle a publié entre autres Mobilité religieus..
Katrin Lehmann im Interview, 8. Dezember 2023
No full textKATRIN LEHMANN IM INTERVIEW, 8. DEZEMBER 2023
Katrin Lehmann im Interview, 8. Dezember 2023 ( -
The neutrino mass experiment KATRIN
Get PDFThe KArlsruhe TRItium Neutrino (KATRIN) experiment is a large-scale experiment with the objective to determine the effective electron anti-neutrino mass with an unprecedented sensitivity of 0.2 eV/c2 at 90% C.L. in a model-independent way. The measurement method is based on precision β-decay spectroscopy of molecular tritium. The experimental setup consists of a high luminosity windowless gaseous tritium source, a magnetic electron transport system with differential and cryogenic pumping for tritium retention, and an electro-static spectrometer section for energy analysis, followed by a segmented detector system for counting transmitted β-electrons. The experiment was constructed at the Karlsruhe Institute of Technology in Germany and is currently in the final commissioning phase before the commencement of tritium operation.
This proceedings will give an overview of the KATRIN experiment and its current status. Furthermore, initial results of recent commissioning measurements of the completed KATRIN beamline will be presented
High-resolution spectroscopy of gaseous 83mKr conversion electrons with the KATRIN experiment
No full textIn this work, we present the first spectroscopic measurements of conversion electrons originating from the decay ofmetastable gaseous 83mKr with the Karlsruhe Tritium Neutrino (KATRIN) experiment. The obtained results represent one of the major commissioning milestones for the subsequent direct neutrino mass measurement with KATRIN. The successful campaign demonstrates the functionalities of the KATRIN beamline. Precisemeasurement of the narrow K-32, L3-32, and N2,3-32 conversion electron lines allowed to verify the eV-scale energy resolution of the KATRIN main spectrometer necessary for competitive measurement of the absolute neutrino mass scale
Studies on general neutrino interactions with the KATRIN experiment
No full textThe Karlsruhe Tritium Neutrino (KATRIN) Experiment aims to determine the neutrino mass using precision spectroscopy of electrons from tritium β-decay. Recently, KATRIN published an improved upper bound of 0.45 eV at 90% C.L. [1] on the effective electron-neutrino mass. Beyond the neutrino mass measurement, KATRIN’s high-precision spectroscopy enables searches for physics beyond the Standard Model, such as general neutrino interactions (GNI). These interactions can manifest as subtle shape deformations in the measured energy spectrum. The GNI framework provides a model-agnostic approach by combining all theoretically allowed interaction terms into an effective field theory, describing energy-dependent spectral contributions as indicators of novel weak processes. Recently, first constraints on GNI based on KATRIN data were released [2]. This talk will give an overview of the GNI framework and analysis, and present further studies using KATRIN data.
This work is supported by the Helmholtz Association and by the Ministry for Education and research BMFTR (grant numbers 05A23PMA, 05A23PX2, 05A23VK2 and 05A23WO6
Penning trap induced background in the KATRIN experiment
No full textThe KArlsruhe TRItium Neutrino (KATRIN) experiment is a largescale experiment with the objective to determine the effective electron anti-neutrino mass with an unprecedented sensitivity of 0.2 eV/c2 at 90% CL in a model-independent way based on precision β-decay spectroscopy of molecular tritium. KATRIN is currently in the middle of several physics measurement campaigns and so far has improved the upper bound on the effective electron-neutrino mass to 0.8 eV at a 90% confidence level.
A Penning trap located between the KATRIN spectrometers, in combination with a large flux of β-decay electrons in this area, produces a scan-step-duration-dependent background which is one of the leading systematic uncertainties of KATRIN. This background was successfully mitigated with an optimized configuration of the voltages in the KATRIN beamline and is not present anymore in recent measurement campaigns. This talk will present measurements and a background model to describe the Penning trap induced background.
This work is supported by the Helmholtz Association, the Ministry for Education and Research BMBF (05A17PM3, 05A17PX3, 05A17VK2, and 05A17WO3), the Helmholtz Alliance for Astroparticle Physics (HAP), and the Helmholtz Initiative and Networking Fund (W2/W3-118)
KATRIN: status and prospects for the neutrino mass and beyond
No full textThe Karlsruhe Tritium Neutrino (KATRIN) experiment is designed to measure a high-precision integral spectrum of the endpoint region of T2 β decay, with the primary goal of probing the absolute mass scale of the neutrino. After a first tritium commissioning campaign in 2018, the experiment has been regularly running since 2019, and in its first two measurement campaigns has already achieved a sub-eV sensitivity. After 1000 days of data-taking, KATRIN’s design sensitivity is 0.2 eV at the 90% confidence level. In this white paper we describe the current status of KATRIN; explore prospects for measuring the neutrino mass and other physics observables, including sterile neutrinos and other beyond-Standard-Model hypotheses; and discuss research-and-development projects that may further improve the KATRIN sensitivity
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