A5075890035- Superconducting and THz Device Technology
- Neutrino Physics Research
- Physics of Superconductivity and Magnetism
- Atomic and Subatomic Physics Research
- Glass properties and applications
- Nuclear Physics and Applications
- Nuclear physics research studies
- Dark Matter and Cosmic Phenomena
- Theoretical and Computational Physics
- Particle physics theoretical and experimental studies
- Quantum, superfluid, helium dynamics
- Solid-state spectroscopy and crystallography
- Material Dynamics and Properties
- Astrophysics and Cosmic Phenomena
- thermodynamics and calorimetric analyses
- X-ray Spectroscopy and Fluorescence Analysis
- Superconductivity in MgB2 and Alloys
- Quantum optics and atomic interactions
- Radioactive Decay and Measurement Techniques
- Particle Detector Development and Performance
- Atomic and Molecular Physics
- Calibration and Measurement Techniques
- Radiation Detection and Scintillator Technologies
- Quantum and electron transport phenomena
- Thermal properties of materials
Heidelberg University
2016-2025
Kirchhoff (Germany)
2016-2025
Institute for Physics
2021-2025
Karlsruhe Institute of Technology
2018-2024
Amorepacific (South Korea)
2024
Columbia University
2015
Weizmann Institute of Science
2015
University of Insubria
2015
Brown University
1993-2009
Heidelberg University
1994-2008
The atomic mass difference of (163)Ho and (163)Dy has been directly measured with the Penning-trap spectrometer SHIPTRAP applying novel phase-imaging ion-cyclotron-resonance technique. Our measurement solved long-standing problem large discrepancies in Q value electron capture determined by different techniques. shifts current 2555(16) eV evaluated Atomic Mass Evaluation 2012 [G. Audi et al., Chin. Phys. C 36, 1157 (2012)] more than 7σ to 2833(30(stat))(15(sys)) eV/c(2). With new it will be...
Neutrinos, and in particular their tiny but non-vanishing masses, can be considered one of the doors towards physics beyond Standard Model. Precision measurements kinematics weak interactions, 3H β-decay 163Ho electron capture (EC), represent only model independent approach to determine absolute scale neutrino masses. The experiment, ECHo, is designed reach sub-eV sensitivity on mass by means analysis calorimetrically measured spectrum nuclide 163Ho. maximum energy available for this decay,...
This paper reports on the development of a technology involving $$^{100}\hbox {Mo}$$ -enriched scintillating bolometers, compatible with goals CUPID, proposed next-generation bolometric experiment to search for neutrinoless double-beta decay. Large mass ( $$\sim 1~\hbox {kg}$$ ), high optical quality, radiopure -containing zinc and lithium molybdate crystals have been produced used develop performance single detector modules based 0.2–0.4 kg bolometers. In particular, energy resolution...
The Advanced Molybdenum-based Rare process Experiment (AMoRE) aims to search for neutrinoless double beta decay (0$\nu\beta\beta$) of $^{100}$Mo with $\sim$100 kg $^{100}$Mo-enriched molybdenum embedded in cryogenic detectors a dual heat and light readout. At the current, pilot stage AMoRE project we employ six calcium molybdate crystals total mass 1.9 kg, produced from $^{48}$Ca-depleted ($^{48\textrm{depl}}$Ca$^{100}$MoO$_4$). simultaneous detection heat(phonon) scintillation (photon)...
We present a measurement of the low-energy (0–60 keV) γ-ray spectrum produced in α decay U233 using dedicated cryogenic magnetic microcalorimeter. The energy resolution ∼10 eV, together with exceptional gain linearity, allows us to determine low-lying isomeric state Th229 four complementary evaluation schemes. most precise scheme determines isomer be 8.10(17) corresponding 153.1(32) nm, superseding precision previous values based on γ spectroscopy, and agreeing recent internal conversion...
Abstract AMoRE-II aims to search for neutrinoless double beta decay ( $$0\nu \beta $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>0</mml:mn> <mml:mi>ν</mml:mi> <mml:mi>β</mml:mi> </mml:mrow> </mml:math> ) with an array of 423 $$\hbox {Li}_2^{100}\hbox {MoO}_4$$ <mml:msubsup> <mml:mtext>Li</mml:mtext> <mml:mn>2</mml:mn> <mml:mn>100</mml:mn> </mml:msubsup> <mml:msub> <mml:mtext>MoO</mml:mtext> <mml:mn>4</mml:mn> </mml:msub> crystals operating in the cryogenic...
We present two variants of a magnetic microcalorimeter with paramagnetic temperature sensors and integrated dc-superconducting quantum interference device readout for high-resolution x-ray emission spectroscopy. Each variant employs overhanging gold absorbers sensitive area 150 × μm2 thickness 3 μm, thus providing related efficiency &gt;98% photons up to 5 keV &gt;50% 10 keV. The first operated nominally but suffered from Joule power dissipation the Josephson junction shunt...
Metallic magnetic calorimeters (MMC) are calorimetric particle detectors, typically operated at temperatures below 100 mK, that make use of a paramagnetic temperature sensor to transform the rise upon absorption in detector into measurable flux change dc‐SQUID. During last years growing number groups has started develop MMC for wide variety applications, ranging from alpha‐, beta‐ and gamma‐spectrometry over spatially resolved detection accelerated molecule fragments arrays high resolution...
The LUMINEU program aims at performing a pilot experiment on neutrinoless double beta decay of 100Mo using radiopure ZnMoO4 crystals operated as cryogenic scintillating bolometers. Growth high quality is complex task, since there are no commercial molybdenum compounds available with the required level purity and radioactive contamination. This paper discusses approaches to purify synthesize for crystal growth. A combination sublimation (with addition zinc molybdate) subsequent...
To reach ultra-low detection thresholds necessary to probe unprecedentedly low Dark Matter masses, target material alternatives and novel detector designs are essential. One such is superfluid ^4 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi /><mml:mn>4</mml:mn></mml:msup></mml:math> He which has the potential so far uncharted light parameter space at sub-GeV masses. The new “Direct search Experiment for Light dark matter”, DELight, will be using...
Abstract The investigation of the absolute scale effective neutrino mass remains challenging due to exclusively weak interaction neutrinos with all known particles in standard model particle physics. At present, most precise and least-model-dependent upper limit on electron antineutrino is set by Karlsruhe Tritium Neutrino Experiment (KATRIN) from analysis tritium β-decay. Another promising approach capture 163 Ho, which under using microcalorimetry Electron Capture Holmium (ECHo) HOLMES...
Abstract The AMoRE collaboration searches for neutrinoless double beta decay of $$^{100}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mmultiscripts> <mml:mrow/> <mml:mn>100</mml:mn> </mml:mmultiscripts> </mml:math> Mo using molybdate scintillating crystals via low temperature thermal calorimetric detection. early phases the experiment, AMoRE-pilot and AMoRE-I, have demonstrated competitive discovery potential. Presently, AMoRE-II featuring a large detector array with...
Superfluid <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mmultiscripts><a:mrow><a:mi>He</a:mi></a:mrow><a:mprescripts/><a:none/><a:mrow><a:mn>4</a:mn></a:mrow></a:mmultiscripts></a:mrow></a:math> is an ideal candidate for the direct detection of light dark matter via nuclear recoils thanks to its low mass and possibility reach a low-detection-energy threshold by exploiting generated quasiparticles. The design future detectors based on this target, such as...
AMoRE searches for the neutrinoless double beta decay using 100 kg of enriched Mo100. Scintillating molybdate crystals coupled with a metallic magnetic calorimeter operate at milli-Kelvin temperatures to measure energy electrons emitted in decay. AMoRE-I is demonstrator full-scale AMoRE, operated Yangyang Underground Laboratory over two years. The exposure was 8.02 year (or 3.89 kgMo100 year), and total background rate near Q value 0.025±0.002 counts/keV/kg/year. We observed no indication...
AMoRE (Advanced Mo based Rare process Experiment) collaboration is going to use calcium molybdate crystals as cryogenic scintillation detector in a search for neutrinoless DBD of 100Mo isotope. Simultaneous detection phonons and light will be used reject internal background. A FWHM resolution 0.2% the phonon channel has been achieved with 0.5 cm3 crystal. Several 40Ca100MoO4 (≈ kg) have developed from enriched depleted 40Ca materials. The yield these shown comparable reference CaMoO4...