A5088298995- Nuclear physics research studies
- Astronomical and nuclear sciences
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Nuclear Physics and Applications
- Particle Detector Development and Performance
- Landslides and related hazards
- Cryospheric studies and observations
- Geophysical and Geoelectrical Methods
- Seismic Waves and Analysis
- Solar and Space Plasma Dynamics
- Earthquake Detection and Analysis
- Molecular Spectroscopy and Structure
- Radiation Detection and Scintillator Technologies
- Photochemistry and Electron Transfer Studies
- Nuclear reactor physics and engineering
- Particle physics theoretical and experimental studies
- Remote Sensing and Land Use
- Radiation Therapy and Dosimetry
- Soil and Unsaturated Flow
- Scientific Research and Discoveries
- Fluid Dynamics Simulations and Interactions
- Advanced NMR Techniques and Applications
- Gas Dynamics and Kinetic Theory
- Radiopharmaceutical Chemistry and Applications
University of Cologne
1984-2023
Heidelberg University
2021
Johannes Gutenberg University Mainz
2019
RWTH Aachen University
2014-2015
Institute of Geodesy and Geophysics
2007-2013
Graz University of Technology
2013
FZI Research Center for Information Technology
2003
Universidad Nacional de La Plata
2000
The Mu3e experiment aims to find or exclude the lepton flavour violating decay $\mu \rightarrow eee$ at branching fractions above $10^{-16}$. A first phase of using an existing beamline Paul Scherrer Institute (PSI) is designed reach a single event sensitivity $2\cdot 10^{-15}$. We present overview all aspects technical design and expected performance phase~I detector. high rate up $10^{8}$ muon decays per second low momenta electrons positrons pose unique set challenges, which we tackle...
The Gradenbach mass movement (GMM) is an example of DGSD (deep-seated gravitational slope deformation) in crystalline rocks the Eastern Alps (12.85°E, 47.00°N). main body GMM covers area 1.7 km2 and its volume about 120 × 106 m3. A reconstruction deformation history yields a mean displacement ∼ 22 m from 1962 to 2011. In 1965/66, 1975, 2001, 2009 high sliding velocities, exceeding several meters per year, interrupt quasi-stationary periods slow (≤0.3 m/year). Since 1999 has been observed by...
Long‐offset transient electromagnetic (LOTEM) data from the Vesuvius volcano, in Italy, show that EM response of topography is a potential cause distortions. A modeling study was carried out to simulate effect mountainous terrain on vertical magnetic‐field time derivatives using 3-D finite‐difference code. The objectives were assess importance topographic effects and help identify them existing field data. total LOTEM can be considered as combination four distortions corresponding responses...
A long‐offset transient electromagnetic (LOTEM) survey was carried out on Merapi volcano, Indonesia, in 1998. LOTEM data have been recorded at 41 receiver locations which cover a 10 km W–E and 15 S–N profile. The signals were transmitted four the south, west, north sides of Merapi. interpreted with one‐dimensional (1‐D) inversions. In addition, two particular features investigated 3‐D modeling. On south flank magnetic field show strong distortions consistently over profile can only be...
The resonance Raman (RR) spectra of monomeric 3,3',4,4',5,5'-hexamethylpyrromethene (HMPM) were measured upon excitation in with the strong 436 nm absorption band. experimental analyzed by comparison calculated RR that obtained on basis scaled quantum chemical force fields combination transform theory. ground-state structure and field HMPM density functional theory (DFT) using B3LYP exchange 6-31G* set. adopts a planar contrast to dimers which intermolecular hydrogen-bonding interactions...
Background: The nucleosynthesis of the group neutron-deficient $p$ nuclei remains an unsolved puzzle in nuclear astrophysics. Among these nuclei, $^{94}\mathrm{Mo}$ is one most abundant and notoriously underproduced theoretical network calculations. In networks, respective cross sections reaction rates play a crucial role. Since many reactions astrophysical relevance are not accessible laboratory, global robust framework required to provide reliable predictions.Purpose: Extending...
Background: For the description of many astrophysical processes, precise knowledge cross sections and reaction rates is necessary. In particular, exact nucleosynthesis mechanisms $p$ nuclei---a group 30 to 35 neutron deficient nuclei---are still unknown. Since reactions relevance are not accessible in laboratory, one has rely on theoretical calculations based Hauser-Feshbach codes. The calculated values depend strongly nuclear physics input parameters like level densities (NLDs),...
The Mu3e experiment is searching for the charged lepton flavour violating decay\break μ+→ e+ e− e+, aiming an ultimate sensitivity of one in 1016 decays. In environment up to 109 muon decays per second detector needs provide precise vertex, time and momentum information suppress accidental physics background. consists cylindrical layers 50 μm thin High Voltage Monolithic Active Pixel Sensors (HV-MAPS) placed a 1 T magnetic field. measurement trajectories decay particles allows vertex...
A newly refined electromagnetic technique has imaged the electrical structure of Vesuvius, and its success indicates it can be a very effective tool in forecasting volcano eruptions. The hope is to able gather enough data from active volcanoes establish an adequate baseline information for surveillance better understand their structure. Known as long‐offset transient (LOTEM) technique, development been made possible by modern modeling algorithms higher computing power, both lacking earlier...
Background: The nucleosynthesis of heavy nuclei is affected by the reaction rates radiative capture reactions. Many astrophysical relevant cannot be obtained from experiments but are theoretical models. $\ensuremath{\gamma}$-decay widths that derived strength functions one key nuclear physics input parameters in those calculations. explicit study $\ensuremath{\gamma}$-ray has been thoroughly addressed last decade and various methods have established to extract dipole atomic nuclei.Purpose:...
Background: The nucleosynthesis of neutron-deficient $p$ nuclei remains an unsolved puzzle in nuclear astrophysics. Most likely, huge networks containing hundreds reactions are responsible for the creation this group nuclei. In reality, many relevant reaction rates cannot be studied experimentally but need to estimated using global and robust theoretical approaches. underlying physics that enters these calculations is often still not constrained well enough, especially further off valley...
Background: For understanding the synthesis of elements in universe, precise knowledge reaction rates and cross sections is paramount. This especially true for $p$ process because its study requires large network calculations including thousands nuclei nuclear reactions with little room simplification. Therefore, robust theoretical methods predicting are needed which usually based on Hauser-Feshbach calculations. These use physics input form $\ensuremath{\gamma}$-ray strength functions,...
The existence of a set stable proton-rich nuclei - the p cannot be explained via neutron-capture reactions. Therefore, another mechanism has to exist in order explain their origin, most probable, especially at high masses, being photodisintegration This gives rise γ process. Since reactions involved process are not experimentally accessible, reliable statistical model calculations needed predict cross sections and reaction rates. To improve these nuclear input parameters need constrained...
Background: Radionuclides in the Mo-Tc region play an important role modern medical diagnostics. These applications require a $\ensuremath{\gamma}$-emitting radioisotope that is injected into patient. Various production methods of those radionuclides have been investigated past; among them are ($p,x$) reactions on natural or enriched molybdenum. Reliable estimations for produced activity and radioactive byproducts required. Therefore, either precise theoretical calculations firm experimental...
The main aim of the KASCADE extensive air shower (EAS) experiment is determination chemical composition cosmic rays in energy range around and above knee at <i>E<sub>k</sub></i> ≈ 3 PeV. A large number observables are measured simultaneously for each individual event, by combination various detection techniques electromagnetic, muonic, hadronic component showers. Detailed investigations have been performed with data since start taking end 1995. results allow to evaluate interaction...
The astrophysical p process unites all processes that have been introduced to explain the abundance of a group 30 35 neutron-deficient nuclei which are referred as nuclei. In general, these include large networks nuclear reactions and complete understanding individual reaction rates is required describe qualitatively quantitatively. many cases involved not accessible in laboratory, either due their low cross sections or because they involve unstable exotic isotopes. For those purposes,...