K. Helbing
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View article: Sterile-neutrino search based on 259 days of KATRIN data
Sterile-neutrino search based on 259 days of KATRIN data Open
Neutrinos are the most abundant fundamental matter particles in the Universe and play a crucial part in particle physics and cosmology. Neutrino oscillation, discovered about 25 years ago, shows that the three known species mix with each o…
View article: Probing the Firn Refractive Index Profile Using Antenna Response
Probing the Firn Refractive Index Profile Using Antenna Response Open
We present a novel methodology for extracting firn ice properties using reflection coefficients (`S11') of antennas lowered into boreholes. Experiments like the Radio Neutrino Observatory in Greenland (RNO-G) require precise firn index of …
View article: Construction, commissioning and operation of the Radio Neutrino Observatory in Greenland (RNO-G)
Construction, commissioning and operation of the Radio Neutrino Observatory in Greenland (RNO-G) Open
The Radio Neutrino Observatory Greenland (RNO-G) is searching for Askaryan radio signals from ultra-high-energy neutrinos ($E \ge 100\,$PeV) interacting in ice. RNO-G is currently under construction near the apex of the Greenland ice sheet…
View article: Towards the First Neutrino Search with RNO-G
Towards the First Neutrino Search with RNO-G Open
The Radio Neutrino Observatory in Greenland (RNO-G) is located at Summit Station and is designed to detect Askaryan emission from ultra-high energy (UHE) neutrinos above 100 PeV. The detector is proposed to have 35 stations of which 8 have…
View article: Observation of Radio Solar Flares in RNO-G
Observation of Radio Solar Flares in RNO-G Open
The Radio Neutrino Observatory - Greenland (RNO-G) is a multipurpose experiment that extends its scope to sciences like solar heliophysics and radioglaciology beyond its primary focus to detect ultra-high energy neutrinos and cosmic rays. …
View article: The Radio Neutrino Observatory Greenland (RNO-G)
The Radio Neutrino Observatory Greenland (RNO-G) Open
The Radio Neutrino Observatory Greenland (RNO-G) is being constructed at Summit Station in Greenland. It seeks to detect the radio emission of neutrinos interacting in the 3~km thick ice. Radio detection of neutrinos is sensitive to neutri…
View article: Identifying Cosmic Ray Radio Emission in RNO-G’s Deep Antennas
Identifying Cosmic Ray Radio Emission in RNO-G’s Deep Antennas Open
Ultra-high-energy neutrinos are an invaluable messenger for learning about the most energetic and distant astrophysical processes in the universe. Detecting them is challenging due to their extremely low flux and small cross section, neces…
View article: Calibration of the Radio Neutrino Observatory in Greenland using thermal noise
Calibration of the Radio Neutrino Observatory in Greenland using thermal noise Open
The Radio Neutrino Observatory in Greenland (RNO-G) aims to detect ultra-high-energy astro- physical neutrinos (E > 100 PeV). These neutrinos interact with the Greenlandic ice sheet, generating a particle cascade that emits radiation in th…
View article: Simulation of In-ice Askaryan Radiation from Air Shower Cores for Cosmic Rays Search with RNO-G.
Simulation of In-ice Askaryan Radiation from Air Shower Cores for Cosmic Rays Search with RNO-G. Open
The Radio Neutrino Observatory in Greenland (RNO-G) was designed to detect ultra-high energy neutrinos through Askaryan radiation. The detector utilizes radio antennas that are deployed both just below the ice surface and inside the ice bo…
View article: A Multi-Stage Machine Learning Approach to Cosmic Ray Detection in the RNO-G Experiment
A Multi-Stage Machine Learning Approach to Cosmic Ray Detection in the RNO-G Experiment Open
The Radio Neutrino Observatory-Greenland (RNO-G), deployed at Summit Station, Greenland, aims to detect ultra-high-energy (UHE) neutrinos. To maximize sensitivity, RNO-G operates with low trigger thresholds, leading to data dominated by ba…
View article: Cosmic-ray air showers as detected with the shallow antenna of RNO-G
Cosmic-ray air showers as detected with the shallow antenna of RNO-G Open
The Radio Neutrino Observatory Greenland (RNO-G) is an in-ice neutrino detector currently under construction on top of the Greenlandic ice sheet. Its primary goal is to achieve detection of neutrinos beyond energies of $\sim$ 10 PeV. Each …
View article: First Constraints on General Neutrino Interactions Based on KATRIN Data
First Constraints on General Neutrino Interactions Based on KATRIN Data Open
The precision measurement of the tritium β-decay spectrum performed by the KATRIN experiment provides a unique way to search for general neutrino interactions (GNIs). All theoretically allowed GNI terms at dimension 6 involving neutrinos a…
View article: Direct neutrino-mass measurement based on 259 days of KATRIN data
Direct neutrino-mass measurement based on 259 days of KATRIN data Open
That 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 effec…
View article: Current Developments in the Forefield Reconnaissance System for Melting Probes for the Exploration of Subglacial Lakes with the TRIPLE Project
Current Developments in the Forefield Reconnaissance System for Melting Probes for the Exploration of Subglacial Lakes with the TRIPLE Project Open
In search of extraterrestrial life within the solar system, Jupiter’s moon Europa emerges as a promising candidate. Previous observations indicate the existence of a global ocean beneath the moon’s icy shell. To explore the hidden water re…
View article: Measurement of the electric potential and the magnetic field in the shifted analysing plane of the KATRIN experiment
Measurement of the electric potential and the magnetic field in the shifted analysing plane of the KATRIN experiment Open
The projected sensitivity of the effective electron neutrino-mass measurement with the KATRIN experiment is below 0.3 eV (90 % CL) after five years of data acquisition. The sensitivity is affected by the increased rate of the background el…
View article: Searches for beyond-standard-model physics with astroparticle physics instruments
Searches for beyond-standard-model physics with astroparticle physics instruments Open
Many instruments for astroparticle physics are primarily geared towards multi-messenger astrophysics, to study the origin of cosmic rays and to understand high-energy astrophysical processes. Since these instruments observe the Universe at…
View article: Search for Lorentz-invariance violation with the first KATRIN data
Search for Lorentz-invariance violation with the first KATRIN data Open
Some extensions of the Standard Model of particle physics allow for Lorentz invariance and charge-parity-time invariance violations. In the neutrino sector strong constraints have been set by neutrino-oscillation and time-of-flight experim…
View article: Hybrid concept for a forefield reconnaissance system for melting probes capable of moving through terrestrial and extraterrestrial cryospheres
Hybrid concept for a forefield reconnaissance system for melting probes capable of moving through terrestrial and extraterrestrial cryospheres Open
The most promising places for the development of extraterrestrial life are the ocean worlds of our Solar system such as the icy moons Europa or Enceladus and their subglacial oceans. Space mission concepts are being developed to explore th…
View article: KATRIN: status and prospects for the neutrino mass and beyond
KATRIN: status and prospects for the neutrino mass and beyond Open
The Karlsruhe Tritium Neutrino (KATRIN) experiment is designed to measure a high-precision integral spectrum of the endpoint region of T 2 β decay, with the primary goal of probing the absolute mass scale of the neutrino. After a first tri…
View article: New Constraint on the Local Relic Neutrino Background Overdensity with the First KATRIN Data Runs
New Constraint on the Local Relic Neutrino Background Overdensity with the First KATRIN Data Runs Open
We report on the direct cosmic relic neutrino background search from the first two science runs of the KATRIN experiment in 2019. Beta-decay electrons from a high-purity molecular tritium gas source are analyzed by a high-resolution MAC-E …
View article: Improved eV-scale sterile-neutrino constraints from the second KATRIN measurement campaign
Improved eV-scale sterile-neutrino constraints from the second KATRIN measurement campaign Open
We present the results of the light sterile neutrino search from the second Karlsruhe Tritium Neutrino (KATRIN) measurement campaign in 2019. Approaching nominal activity, 3.76×106 tritium β-electrons are analyzed in an energy window exten…
View article: Simulating radio propagation in ice with Parabolic Equations: applications to terrestrial glaciers and ice moons
Simulating radio propagation in ice with Parabolic Equations: applications to terrestrial glaciers and ice moons Open
We investigate the use of Parabolic Equation (PE) simulations in modelling the propagation of radio waves in inhomogeneous ice environments, such as the firn layer of terrestrial glaciers in the Alps and Antarctic. In particular PEs allow …
View article: Development of a permittivity sensor for melting probes to explore terrestrial and extraterrestrial cryospheres
Development of a permittivity sensor for melting probes to explore terrestrial and extraterrestrial cryospheres Open
We will present the design of a permittivity sensor that can be attached to a melting probe and measure the respective ice properties during the melting process, yielding in a comprehensive permittivity profile. Melting probes were already…
View article: Forward Beam Monitor for the KATRIN experiment
Forward Beam Monitor for the KATRIN experiment Open
The KArlsruhe TRItium Neutrino (KATRIN) experiment aims to measure the neutrino mass with a sensitivity of 0.2 eV (90 % CL). This will be achieved by a precision measurement of the endpoint region of the β-electron spectrum of tritium deca…
View article: The Wavelength-Shifting Optical Module
The Wavelength-Shifting Optical Module Open
The Wavelength-shifting Optical Module (WOM) is a novel photosensor concept for the instrumentation of large detector volumes with single-photon sensitivity. The key objective is to improve the signal-to-noise ratio, which is achieved by d…