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Vera Butz (Institute for Theoretical Physics, Heidelberg University)4/13/26, 5:00 PMPoster
The ECHo experiment aims to determine the electron neutrino mass from electron capture in $^{163}$Ho. This requires an accurate theoretical description of the differential decay rate as a function of how the total decay energy is shared between the neutrino and the electronic excitations.
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We achieve this using multireference methods previously developed for core-level X-ray spectroscopy.... -
Sergey Vasiliev (University of Turku)4/13/26, 5:01 PMPoster
We present experimental results on loading a large Ioffe-Pritchard trap with atomic hydrogen gas at temperatures around 100 mK. Dissociation of molecular hydrogen is performed in a cryogenic RF dissociator operating below 1 K. We demostrate that atomic fluxes close to $10^{14}$ atoms/s are obtained with the average RF power in the dissociator of several mW. We propose modifications of this...
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David Frese4/13/26, 5:03 PMPoster
David Frese, Marcus Lai, Genrich Zeller, Caroline Rodenbeck, Magnus Schlösser for the TLK ATS Team
The current world leading upper limit on the neutrino mass is provided by the KATRIN Experiment with $m_\nu<0.45\,$eV/c$^2$. To improve the sensitivity on the neutrino mass by at least one order of magnitude new technologies are necessary. In addition to new detector technologies,...
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Daniel de Vincenz (TLK / IAP)4/13/26, 5:05 PMPoster
Knowledge of the electron antineutrino mass is crucial for further advancements in cosmology and particle physics. Although the KATRIN collaboration has already confined the possible parameter space below 0.45 eV by investigating the beta decay spectrum of tritium, the sensitivity of this method is physically limited by the excitation spectrum of decayed tritium molecules. Therefore,...
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Philipp Lingnau (KIT)4/13/26, 5:07 PMPoster
The KATRIN experiment has put the most stringent model-independent upper limit on the electron antineutrino mass. The goal is to limit it to < 0.3 eV. To achieve this, a large amount of tritium beta-electrons need to be analyzed using a MAC-E-filter type spectrometer.
One systematic effect on the neutrino mass measurement is the detector backscattering. We are using simulations describing...
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Beate Bornschein (Karlsruhe Institute of Technology, Institute for Astroparticle Physics), Michael Sturm4/13/26, 5:09 PMPoster
The Tritium Laboratory Karlsruhe (TLK) of the Institute for Astroparticle Physics (IAP) located at KIT Campus North contributed in advancing the understanding of the radioactive hydrogen isotope tritium and its technical use for applications in nuclear fusion, astroparticle physics and beyond. Two of its outstanding features are its license to handle up to 40 grams of tritium, and its unique...
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Dr Christoph Köhler (MPIK), Xaver Stribl (MPIK/TUM)4/13/26, 5:11 PMPoster
Light sterile neutrinos with a mass on the eV-scale could explain several anomalies observed in short-baseline oscillation experiments. The Karlsruhe Tritium Neutrino (KATRIN) experiment is designed to directly determine the effective electron anti-neutrino mass by measuring the tritium beta decay spectrum. The measured spectrum can also be investigated for the signature of light sterile...
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Carlotta Buchner (Karlsruhe Institute of Technology – Institute for Astroparticle Physics (KIT-IAP))4/13/26, 5:13 PMPoster
The KATRIN experiment aims to determine the effective mass of the electron antineutrino using kinematics of the electrons from tritium $\beta$ decay. The current upper limit determined by the KATRIN experiment is $m_\nu<0.45\,\mathrm{eV}$ at 90\% confidence level (KATRIN Collaboration et al., Direct neutrino-mass measurement based on 259 days of KATRIN data. Science 388, 180-185 (2025)....
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Jaroslav Storek (IAP), Karo Erhardt4/13/26, 5:15 PMPoster
The determination of the neutrino mass in the KATRIN experiment relies on the magnetic adiabatic collimation with electrostatic filtering (MAC-E filter) technique. A precise knowledge of the electric potential in the source region is essential for achieving the experiment’s targeted sensitivity. Metastable krypton-83 (83mKr) is used as a calibration source to probe and characterize the source...
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Christoph Schweiger (Max-Planck-Institut für Kernphysik, Heidelberg, Germany)4/13/26, 5:17 PMPoster
Among the most important quantities in fundamental physics for cosmology and beyond standard model theories is the effective mass of the electron (anti-)neutrino, $m_{\nu}$. To date, the most constraining, least model-dependent upper limit on $m_{\nu}$ is set by the KATRIN collaboration with $<450\,\mathrm{meV}/\mathrm{c}^2$ [1]. In complementary experiments by the ECHo [2] and HOLMES [3]...
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Justus Beisenkötter (Uni Münster)4/13/26, 5:19 PMPoster
The KATRIN experiment aims to determine the mass of the neutrino by scanning the electron energy spectrum near the endpoint. However, electrons can scatter off tritium molecules in the source of the experiment and lose energy in the process. Therefore, the energy loss function, i.e. the probability for an electron to loose a certain amount of energy in a scattering reaction, must be measured...
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Patrick Alexander Unkhoff (University Münster)4/13/26, 5:21 PMPoster
The neutrino mass experiment KATRIN has effectively collected 1000 days of tritium beta decay data, allowing to achive a sensitivity for an upper limit on the electron neutrino mass of m < 300 meV at 90% C.L.. After searching for sterile keV neutrinos with the TRISTAN detector at KATRIN a potential next generation experiment labeled KATRIN++ aims to go beyond this limit and probe the inverted...
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Federico Bianco (Università La Sapienza, INFN sezione Genova)4/13/26, 5:23 PMPoster
The HOLMES experiment aims to measure the neutrino mass by investigating the electron capture decay spectrum of $^{163}$Ho using Transition Edge Sensor (TES) microcalorimeters. The final design foresees arrays implanted with about 30 Bq per detector of the selected isotope.
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To perform the implantation and separate $^{163}$Ho contaminants, a dedicated mass-separator beamline has been... -
Giulio Gagliardi (University of Milano-Bicocca), Tom Geigle (KIT)4/13/26, 5:25 PMPoster
This year the KATRIN experiment will shift from the neutrino mass measurement to the search for keV-scale sterile neutrinos.
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For this purpose, the experiment will be equipped with a new detector system, called TRISTAN, which will be able to handle the increased count rates and provide high energy resolution.
Due to the high count rates of the detector and the possibility of a very small... -
Chloe Goupy (MPIK), Neven Kovac (Institute for Astroparticle Physics, Karlsruhe Institute of Technology), Svenja Heyns4/13/26, 5:27 PMPoster
After completing 1000 days of data taking at the KATRIN experiment, the collaboration expects to reach a final sensitivity on the effective electron neutrino mass below 300 meV. However, from the neutrino oscillation experiments, we know that neutrino mass can be as low as 50 meV or 9 meV, depending on the mass ordering. Taking the next step in direct neutrino-mass searches includes probing...
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Sara Gamba4/13/26, 5:29 PMPoster
Several experiments --- HOLMES, ECHo, and NUMECS --- have begun investigating the electron-capture decay of $^{163}\mathrm{Ho}$ to determine the neutrino mass. They studied this process using low-temperature microcalorimetry, in which the decaying Holmium is embedded directly into the absorber of cryogenic detectors, typically a few hundred micrometers in size. This configuration enables...
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Alessandro Schwemmer (Max-Planck-Institut für Kernphysik)4/13/26, 5:31 PMPoster
The cosmic neutrino background is one of the remaining predictions of Big Bang cosmology that has yet to be directly observed.
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The Karlsruhe Tritium Neutrino (KATRIN) experiment, primarily designed to probe the effective electron anti-neutrino mass, performs a high-precision measurement of the tritium beta-decay spectrum near its kinematic endpoint.
This data also enables us to search for... -
Justus Beisenkötter (Uni Münster), Neven Kovac (Institute for Astroparticle Physics, Karlsruhe Institute of Technology), Dr Rudolf Sack (Karlsruhe Institut für Technologie)4/13/26, 5:33 PMPoster
Currently, the tightest constraints on the absolute scale of neutrino mass from a direct, model-independent approach, are obtained by the KATRIN experiment, giving an upper limit on the mass of the electron anti-neutrino of 0.45 eV (https://doi.org/10.48550/arXiv.2406.13516), with final projected sensitivity below 0.3 eV.
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Reaching these ambitious goals requires proper treatment of all... -
Lutz Bornschein (IAP-KIT)4/14/26, 5:05 PMPoster
The design of the KATRIN experiment was based on the successful predecessor experiments in Mainz and Troitsk, which collected data in the 1990s and early 2000s. While both experiments used the same principle for analyzing the energy of tritium decay electrons — the MAC-E filter — the tritium sources were of very different types.
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In Troitsk, a gaseous molecular tritium source was used, a... -
Moritz Hellmann (KIT-TLK), Genrich Zeller (KIT-TLK)4/14/26, 5:07 PMPoster
The KATRIN experiment determines the absolute neutrino mass via high-precision electron spectroscopy of the tritium β-decay spectrum. Recently, an upper limit of 0.45 eV (90% C.L.) was achieved, with a target sensitivity of 0.3 eV. As KATRIN and next-generation experiments advance, the demand for solid-state tritium sources and targets continues to grow. Promising candidate materials include...
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Ms Aya El Boustani (University of Mainz), Ms Brunilda Mucogllava (University of Mainz)4/14/26, 5:09 PMPoster
To overcome statistical and systematic limitations arising from the rovibrational final-state distribution of molecular tritium, future precision mass-measurement experiments are pursuing atomic tritium sources. Within the Karlsruhe Mainz Atomic Tritium Effort (KAMATE), we investigate the dissociation fraction of thermal effusive atomic sources. In these sources, molecular gas is directed...
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David Frese, Görkem Yavuz4/14/26, 5:11 PMPoster
David Frese, Görkem Yavuz, Caroline Rodenbeck for the TLK ATS Team
The current world leading upper limit on the neutrino mass is provided by the KATRIN Experiment with $m_{\nu_e}<0.45\,$eV/c$^2$. To improve the sensitivity on the neutrino mass by at least one order of magnitude new technologies are necessary. In addition to new detector technologies, transitioning from a molecular tritium...
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Neven Kovac (Institute for Astroparticle Physics, Karlsruhe Institute of Technology)4/14/26, 5:13 PMPoster
Metallic Magnetic Calorimeters (MMCs) are low temperature single particle detectors, whose working principle is based on quantum technology. Due to their excellent energy resolution, near linear detector response, fast signal rise time and close to 100\% quantum efficiency, MMCs outperform conventional detectors by several orders of magnitude, making them interesting for a wide range of...
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Dr Anthony Onillon (Max-Planck-Institut für Kernphysik)4/14/26, 5:15 PMPoster
Sterile neutrinos in the keV mass range are a well-motivated extension of the Standard Model and viable dark matter candidates. Their existence can be probed in laboratory experiments, as the admixture of a sterile state would induce a characteristic kink-like distortion in the β-decay electron energy spectrum. Following the completion of its neutrino mass program, KATRIN will extend its...
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Alec Lindman (Johannes Gutenberg Universität Mainz)4/14/26, 5:17 PMPoster
Atomic tritium is a key enabling technology for the next-generation neutrino mass experiment Project 8. However, existing technology cannot supply the high required flow rate of millikelvin atoms, making new developments essential. I will describe design and simulation work underway at Lawrence Berkeley National Laboratory (LBNL) that links large-scale collisional gas simulations at the...
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Joscha Lauer (KIT)4/14/26, 5:19 PMPoster
The Karlsruhe Tritium Neutrino (KATRIN) experiment is designed to measure the effective electron antineutrino mass with a sensitivity better than $m_\nu c^2 = 0.3\,\mathrm{eV}$ (90% CL) in a kinematic approach by applying precision electron spectroscopy to the beta decay of molecular tritium. The measurement focuses on the spectral endpoint ($E_0$) region, extending up to tens of eV below $E_0...
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Diana Parno (Carnegie Mellon University)4/14/26, 5:21 PMPoster
When tritium beta decay occurs within a molecule, the resulting distribution of electronic, vibrational and rotational molecular excitations modifies the shape of the beta spectrum. Experiments like KATRIN require a detailed theoretical understanding of these spectral changes in order to probe the absolute mass scale of the neutrino via TT beta decay. The Tritium Recoil Ion Mass Spectrometer...
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Beate Bornschein (Karlsruhe Institute of Technology, Institute for Astroparticle Physics)4/14/26, 5:23 PMPoster
The most sensitive way to determine the neutrino mass scale without further assumptions is to measure the shape of a tritium beta spectrum near its endpoint. Tritium is the nucleus of choice because of its low endpoint energy, superallowed decay, simple nuclear properties and simple atomic structure. Tritium beta decay experiments have been performed for 8 decades using different types of...
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Kerstin Trost (KIT IAP-TLK)4/14/26, 5:25 PMPoster
In 2026, the Karlsruhe Tritium Neutrino (KATRIN) experiment is undergoing an upgrade to enable the search for keV sterile neutrinos. This upgrade also introduces new systematic uncertainties that must be addressed. The dominant systematic effect arises from electron backscattering at the end of the source, the so-called Rear Wall. This effect can be mitigated by replacing the gold-coated Rear...
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Sarah Untereiner4/14/26, 5:27 PMPoster
To provide students with hands-on insight into modern neutrino mass experiments, a scaled laboratory setup of KATRIN has been developed for the advanced physics lab course at KIT. With an approximate scale of 1:20, the experiment reproduces the essential components of KATRIN, including a tritium source, an adjustable high-voltage spectrometer of the MAC-E filter type, a high-resolution...
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Christoph Köhler (Max-Planck-Institut für Kernphysik), Neven Kovac (Institute for Astroparticle Physics, Karlsruhe Institute of Technology)4/14/26, 5:29 PMPoster
Currently, the tightest constraints on the absolute scale of neutrino mass from a direct, model-independent approach, are obtained by the KATRIN experiment, giving an upper limit on the mass of the electron anti-neutrino of 0.45 eV (https://doi.org/10.48550/arXiv.2406.13516), with final projected sensitivity below 0.3 eV. Reaching this ambitious goal requires proper treatment of all systematic...
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Ms Fiona Braun (KIT - IAP), Simon Gentner (KIT - IAP)4/14/26, 5:31 PMPoster
At the Karlsruhe Institute of Technology (KIT), a full-scale replica of the KATRIN experiment’s detector system was developed to pretest the innovative TRISTAN detector modules. This replica enables comprehensive testing and calibration of up to nine TRISTAN detector modules under controlled conditions, ensuring optimal performance before their integration into the KATRIN beamline in 2026....
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Tobias Geier (IAP-TLK)4/14/26, 5:33 PMPoster
For the next generation neutrino mass experiment KATRIN++, atomic tritium will be used.
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The advantage of using atomic tritium compared to the previously used molecular tritium (T$_2$) lies in the avoidance of molecular excitations in the $^3$HeT$^+$ daughter molecule, which would otherwise lead to a smearing of the beta spectrum and thus limit the maximum achievable sensitivity. To use atomic... -
Chloe Goupy (MPIK), Xaver Stribl4/14/26, 5:35 PMPoster
Electrons from tritium beta decay can lose significant energy through inelastic scattering on gas molecules in the KATRIN source. Accurate modeling of the scattering probabilities and the energy loss distribution is crucial to achieve the desired sensitivity to the electron anti-neutrino mass.
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In this poster we present a method based on Monte Carlo simulations to quantify the impact of... -
Luca Fallböhmer (MPIK)4/14/26, 5:37 PMPoster
Following the completion of its neutrino mass measurement program at the end of 2025, the KATRIN experiment aims to probe keV-scale sterile neutrinos by analyzing the full tritium beta decay spectrum with a novel detector system, TRISTAN. Leveraging KATRIN’s high source activity, this search is sensitive to mixing amplitudes at the parts-per-million level. However, extracting a potential...
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Jan Plößner (MPIK), Karo Erhardt, Khushbakht Habib (Karlsruhe Institute of Technology), Svenja Heyns4/14/26, 5:39 PMPoster
The KArlsruhe TRItium Neutrino (KATRIN) experiment probes the effective electron anti-neutrino mass by a precision measurement of the tritium beta-decay spectrum near the endpoint. Using data from the first five measurement campaigns, KATRIN has established a world-leading upper limit of 0.45$\,$eV/c$^2$ (90% C.L.). After 1000days of measurement and 19 campaigns, the data taking was concluded...
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Sara Gamba4/14/26, 5:41 PMPoster
The HOLMES experiment investigates the electron neutrino mass by studying the end point of the electron-capture decay spectrum of $^{163}$Ho. The detector technology is based on transition edge sensors (TESs) microcalorimeters.
During the first phase of the experiment, the simultaneous readout of multiple detectors was performed via microwave SQUID multiplexing ($\mu$MUX). However, the...
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