P. Baumann
A5043037991- Nuclear Physics and Applications
- Nuclear physics research studies
- Nuclear reactor physics and engineering
- Atomic and Molecular Physics
- Radiation Detection and Scintillator Technologies
- Nuclear Materials and Properties
- Atomic and Subatomic Physics Research
- Quantum Chromodynamics and Particle Interactions
- Astronomical and nuclear sciences
- Advanced Chemical Physics Studies
- Astro and Planetary Science
- X-ray Spectroscopy and Fluorescence Analysis
- Superconducting Materials and Applications
- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Radiation Therapy and Dosimetry
- Particle Detector Development and Performance
- Advanced NMR Techniques and Applications
- Optical measurement and interference techniques
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Fluid Dynamics and Turbulent Flows
- Gamma-ray bursts and supernovae
- Medical Imaging Techniques and Applications
- DNA and Nucleic Acid Chemistry
Robert Bosch (Germany)
2024
ETH Zurich
2021
Centre National de la Recherche Scientifique
2008-2017
Institut National de Physique Nucléaire et de Physique des Particules
2008-2017
Centre de Gestion Scientifique
2003-2014
Swarthmore College
2014
Istituto Nazionale di Fisica Nucleare
2010
FZI Research Center for Information Technology
2010
National Technical University of Athens
2007
Joint Research Center
2006
ABSTRACT The temporal course of replication monitored by 2- or 5-min pulses bromodeoxyuridine (BrdUrd) incorporation in synchronized 3T3 cells was mapped high-resolution light microscopy employing a charge-coupled device (CCD) camera and confocal laser scanning microscope (CLSM). were labeled simultaneously with monoclonal antibodies directed against BrdUrd nuclear lamin, stained the A+T-specific dye 4′,6-diamidino-2-phenylindole (DAPI). Stereoscopic reconstructions showing both lamin...
The ${}^{34,35}\mathrm{Al}$ $\ensuremath{\beta}$ decays have been studied at the CERN online mass separator ISOLDE by \ensuremath{\beta}-\ensuremath{\gamma}, \ensuremath{\beta}-\ensuremath{\gamma}-\ensuremath{\gamma}, and $\ensuremath{\beta}\ensuremath{-}n\ensuremath{-}\ensuremath{\gamma}$ measurements in order to corroborate low-level description of ${}^{34}\mathrm{Si}$ obtain first information on level structure $N=21$ isotope ${}^{35}\mathrm{Si}.$ Earlier observed $\ensuremath{\gamma}$...
Measurements of the beta-decay half-lives neutron-rich nuclei (MgAr) in vicinity N=28 shell closure are reported. Some 22 have been determined, 12 which for first time. Particular emphasis is placed on results Si isotopes, extended from N=25 to 28. Comparison with QRPA calculations suggests that 42Si strongly deformed. This discussed light a possible weakening spin–orbit potential.
The location of several single-neutron states in ${}^{133}\mathrm{Sn}$ has been identified. ${p}_{3/2}$, ${h}_{9/2}$, and ${f}_{5/2}$ were found at 853.7, 1560.9, 2004.6 keV, respectively, by measuring $\ensuremath{\gamma}$ rays coincidence with delayed neutrons following the decay ${}^{134}\mathrm{In}$. Crucial for obtaining new data improved yields mass-separator facility ISOLDE-PSB CERN. A semiempirically adjusted Woods-Saxon calculation, based on parameters from Pb region normalized mass...
A high-resolution measurement of the neutron-induced fission cross section $^{234}\mathrm{U}$ and $^{237}\mathrm{Np}$ has been performed at CERN Neutron Time-of-Flight facility. The sections have determined in a wide energy range from 1 eV to GeV using evaluated $^{235}\mathrm{U}$ as reference. In these measurements determination for resonances could be improved, whereas previous discrepancies were confirmed. New cross-section data are provided high neutron energies that go beyond limits...
The cross section of the reaction $^{197}\mathrm{Au}$($n,\ensuremath{\gamma}$) was measured with time-of-flight technique at n_TOF (neutron time-of-flight) facility in unresolved resonance region between 5 and 400 keV using a pair ${\mathrm{C}}_{6}$D${}_{6}$ (where D denotes $^{2}\mathrm{H}$) liquid scintillators for detection prompt capture $\ensuremath{\gamma}$ rays. results total uncertainty $3.9%--6.7$$%$ resolution 20 bins per energy decade show fair agreement Evaluated Nuclear Data...
We have measured the neutron capture cross sections of stable magnesium isotopes ${}^{24,25,26}$Mg in energy range interest to $s$ process using time-of-flight facility n_TOF at CERN. Capture events from a natural metal sample and samples enriched ${}^{25}$Mg ${}^{26}$Mg were recorded total method based on C${}_{6}$${}^{2}$H${}_{6}$ detectors. Neutron resonance parameters extracted by simultaneous shape analysis present data existing transmission isotopic sample. Maxwellian-averaged for...
The $^{31,32}\mathrm{Na}$ and $^{31}\mathrm{Mg}$ beta decays were studied at the CERN on-line mass separator ISOLDE by gamma, gamma-gamma, neutron-gamma measurements. In $^{31}\mathrm{Na}$ decay, assignment of previously reported \ensuremath{\gamma} transitions observation a new level 3760 keV lead to revised decay scheme which is found in good agreement with calculation including two-particle--two-hole configurations model space, as far only low-lying levels are concerned....
The ($n,\ensuremath{\gamma}$) cross section of $^{197}\mathrm{Au}$ has been measured at n_TOF in the resolved resonance region, up to 5 keV, with aim improving accuracy an energy range where it is not yet considered standard. measurements were performed two different experimental setup and detection techniques, total method based on ${\mathrm{C}}_{6}$${\mathrm{D}}_{6}$ detectors, absorption calorimetry a 4$\ensuremath{\pi}$ BaF${}_{2}$ array. By comparing data collected accurate sets...
The ${}^{33}\mathrm{Na}$ \ensuremath{\beta} decay was studied online using mass separation techniques and a first description of the level structure neutron-rich isotope ${}^{33}\mathrm{Mg},$ with $N=21,$ has been obtained. experiment involved measurement \ensuremath{\beta}-\ensuremath{\gamma}, \ensuremath{\beta}-\ensuremath{\gamma}-\ensuremath{\gamma}, $\ensuremath{\beta}\ensuremath{-}n\ensuremath{-}\ensuremath{\gamma}$ coincidences as well neutron spectra by time-of-flight technique. low...
The151Sm(n,gamma)152Sm cross section has been measured at the spallation neutron facility n_TOF CERN in energy range from 1 eV to MeV. The new combines excellent resolution time-of-flight, low repetition rates, and an unsurpassed instantaneous luminosity, resulting rather favorable signal/background ratios. 151Sm is of importance for characterizing capture nucleosynthesis asymptotic giant branch stars. At a thermal kT=30 keV Maxwellian averaged this unstable isotope (t(1/2)=93 yr) was...
The neutron capture cross sections of the Zr isotopes have important implications in nuclear astrophysics and for reactor design. small section magic nucleus $^{90}\mathrm{Zr}$, which accounts more than 50% natural zirconium represents one key stellar $s$-process, because it acts as a bottleneck chain between Fe seed heavier isotopes. same element, Zr, also is an component structural materials used traditional advanced reactors. ($n,\ensuremath{\gamma}$) has been measured at CERN, using...
The ($n,\ensuremath{\gamma}$) reaction of the radioactive isotope ${}^{93}$Zr has been measured at n_TOF high-resolution time-of-flight facility CERN. Resonance parameters have extracted in neutron energy range up to 8 keV, yielding capture widths smaller (14$%$) than reported an earlier experiment. These results are important for detailed nucleosynthesis calculations and refined studies waste transmutation concepts.
The neutron capture cross section of $^{209}\mathrm{Bi}$ has been measured at the CERN n_TOF facility by employing pulse-height-weighting technique. Improvements over previous measurements are mainly because an optimized detection system, which led to a practically negligible sensitivity. Additional experimental sources systematic error, such as electronic threshold in detectors, summing \ensuremath{\gamma}-rays, internal electron conversion, and isomeric state bismuth, have taken into...
The β decay of the neutron-rich nuclei K51−53 has been used to populate bound and unbound states in Ca50−53. Measurements γ rays as well β-delayed neutrons enabled detailed schemes be established levels identified 50−53Ca. A delayed one-neutron emission probability P1n 63±8% was determined for K51. total seven new transitions were observed following K51, 25 neutron branches found that enrich level scheme Ca51. Delayed probabilities P1n=74.4±9.3% P2n=2.3±0.3% K52, 12 Ca50,51,52. Three Ca52,53...
Neutron resonance analyses have been performed for the capture cross sections of $^{186}\mathrm{Os}$, $^{187}\mathrm{Os}$, and $^{188}\mathrm{Os}$ measured at n_TOF facility cern. Resonance parameters extracted up to 5, 3, 8 keV, respectively, using sammy code a full $R$-matrix fit yields. From these results average were derived by statistical analysis provide comprehensive experimental basis modeling stellar neutron rates isotopes in terms Hauser-Feshbach model. Consistent calculations...
Because the relatively small neutron capture cross sections of zirconium isotopes are difficult to measure, results previous measurements often not adequate for a number problems in astrophysics and nuclear technology. Therefore, $^{92}\mathrm{Zr}$($n,\ensuremath{\gamma}$) section has been remeasured at CERN n_TOF facility, providing set improved parameters 44 resonances energy range up 40 keV. With this information cross-section uncertainties keV region could be reduced $5%$ as required...
Neutron-induced fission cross sections for ${}^{\text{nat}}$Pb and $^{209}\mathrm{Bi}$ were measured with a white-spectrum neutron source at the CERN Neutron Time-of-Flight (n_TOF) facility. The experiment, using neutrons from threshold up to 1 GeV, provides first results these nuclei above 200 MeV. relative $^{235}\mathrm{U}$ $^{238}\mathrm{U}$ in dedicated chamber parallel plate avalanche counter detectors. Results are compared previous experimental data. Upgraded parametrizations of...
The $^{151}\mathrm{Sm}$($n,\ensuremath{\gamma})$ cross section was measured with the time-of-flight technique from 0.6 eV up to 1 MeV relative Au standard an overall uncertainty of typically 6%. Neutrons were produced by spallation at innovative n_TOF facility CERN; $\ensuremath{\gamma}$ rays capture events detected organic ${\text{C}}_{6}{D}_{6}$ scintillators. Experimental setup and data analysis procedures are described emphasis on corrections for detection efficiency, background...
The radiative neutron capture cross section of 207Pb has been measured at the CERN time flight installation n_TOF using pulse height weighting technique in resolved energy region. measurement performed with an optimized setup two C6D6 scintillation detectors, which allowed us to reduce scattered backgrounds down a negligible level. Resonance parameters and kernels have determined for 16 resonances by means R-matrix analysis range from 3 keV 320 keV. Good agreement previous measurements was...