25,941 research outputs found
KATRIN design report 2004
No full textNach 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
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
The neutrino mass experiment KATRIN
No full textThe 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
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)
Quantitative Long-Term Monitoring of the Circulating Gases in the KATRIN Experiment Using Raman Spectroscopy.
No full textThe Karlsruhe Tritium Neutrino (KATRIN) experiment aims at measuring the effective electron neutrino mass with a sensitivity of 0.2 eV/c2, i.e., improving on previous measurements by an order of magnitude. Neutrino mass data taking with KATRIN commenced in early 2019, and after only a few weeks of data recording, analysis of these data showed the success of KATRIN, improving on the known neutrino mass limit by a factor of about two. This success very much could be ascribed to the fact that most of the system components met, or even surpassed, the required specifications during long-term operation. Here, we report on the performance of the laser Raman (LARA) monitoring system which provides continuous high-precision information on the gas composition injected into the experiment's windowless gaseous tritium source (WGTS), specifically on its isotopic purity of tritium - one of the key parameters required in the derivation of the electron neutrino mass. The concentrations c_x for all six hydrogen isotopologues were monitored simultaneously, with a measurement precision for individual components of the order 1e-3 or better throughout the complete KATRIN data taking campaigns to date. From these, the tritium purity, epsilon_T, is derived with precision of <1e-3 and trueness of <3e-3, being within and surpassing the actual requirements for KATRIN, respectively
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
Direct neutrino-mass measurement based on 259 days of KATRIN data
No full textThat neutrinos carry a nonvanishing rest mass is evidence of physics beyond the Standard Model of elementary particles. Their absolute mass holds relevance in fields from particle physics to cosmology. We report on the search for the effective electron antineutrino mass with the KATRIN experiment. KATRIN performs precision spectroscopy of the tritium β-decay close to the kinematic endpoint. On the basis of the first five measurement campaigns, we derived a best-fit value of mv2 = 0.14-0.15+0.13 eV2, resulting in an upper limit of mv < 0.45 eV at 90% confidence level. Stemming from 36 million electrons collected in 259 measurement days, a substantial reduction of the background level, and improved systematic uncertainties, this result tightens KATRIN’s previous bound by a factor of almost two
A full Monte Carlo simulation for keV-sterile neutrino searches with the KATRIN experiment
No full textSterile neutrinos are predicted by several extensions to the Standard Model and, if their mass falls within the keV range, they present a compelling dark matter candidate. One potential searching method involves looking for a kink-like distortion in the β spectrum. The Karlsruhe Tritium Neutrino Experiment (KATRIN) uses a tritium source to measure the neutrino effective mass, focusing on the endpoint where the mass effect is the clearest
The next phase of the KATRIN experiment, known as TRISTAN, seeks to extend this search across the entire tritium spectrum. This phase requires the installation of a new multi-pixel silicon drift detector and a specialized readout system, as well as significant modifications to the KATRIN beamline to improve sensitivity.
In this phase, sensitivity to keV sterile neutrinos is strongly influenced by systematic effects, including electron scattering in the source, detector response, and other factors. Addressing these challenges requires a highly efficient Monte Carlo (MC) simulation of the entire KATRIN beamline, capable of generating high-statistics datasets.
In this presentation, we introduce the KATRIN full MC simulation developed using Geant4. We will outline its key components, assess its performance, and present preliminary studies of systematic uncertainties affecting the search for keV-scale sterile neutrinos
Search for new light bosons with the KATRIN experiment
No full textThe Karlsruhe Tritium Neutrino (KATRIN) experiment is designed to measure the effective electron antineutrino mass with a sensitivity better than mνc2=0.3 eV (90% C.L.) in a kinematic approach by applying precision electron spectroscopy to the beta decay of molecular tritium. This determination occurs in the spectral endpoint (E0) region, i.e. up to some tens of eV below E0≈ 18.6 keV.
Light neutral pseudoscalars and vector bosons arise in many theories beyond the Standard Model (BSM). Constraints on the couplings of such particles to neutrinos or electrons can be derived from cosmological, astrophysical and laboratory observations. High-statistics beta spectroscopy with KATRIN is a complementary probe for these new physics theories; with light bosons emitted in tritium beta decay, the spectrum is altered as described in JHEP 01 (2019) 206. This talk introduces possible interactions of light BSM bosons with their imprint on the observed electron spectrum. We estimate the sensitivity of the second KATRIN measurement campaign to the light boson couplings.
This work is supported by the Helmholtz Association and by the Ministry for Education and Research BMBF (grant numbers 05A23PMA, 05A23PX2, 05A23VK2 and 05A23WO6)
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