E. Berthoumieux
A5054969509- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Nuclear physics research studies
- Radiation Detection and Scintillator Technologies
- Nuclear Materials and Properties
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Radiation Therapy and Dosimetry
- Astro and Planetary Science
- Particle physics theoretical and experimental studies
- Superconducting Materials and Applications
- Atomic and Molecular Physics
- Astronomical and nuclear sciences
- X-ray Spectroscopy and Fluorescence Analysis
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Advanced NMR Techniques and Applications
- Gamma-ray bursts and supernovae
- High-Energy Particle Collisions Research
- Radioactive element chemistry and processing
- Boron Compounds in Chemistry
- Electron and X-Ray Spectroscopy Techniques
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2016-2025
CEA Paris-Saclay
2016-2025
Institut de Recherche sur les Lois Fondamentales de l'Univers
2016-2025
Université Paris-Saclay
2005-2024
University of Pavia
2024
Istituto Nazionale di Fisica Nucleare, Sezione di Pavia
2024
European Organization for Nuclear Research
2011-2023
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
2016-2023
Australian National University
2020
CEA Paris-Saclay - Etablissement de Saclay
2006-2019
The neutron time-of-flight facility n_TOF features a white source produced by spallation through 20GeV/c protons impinging on lead target. facility, aiming primarily at the measurement of neutron-induced reaction cross sections, was operating CERN between 2001 and 2004, then underwent major upgrade in 2008. This paper presents detail all characteristics new beam currently available configurations, which correspond to two different collimation systems choices moderator. discussed include...
A new Micromegas manufacturing technique, based on kapton etching technology, has been developed recently, resulting in further improvement of the characteristics detector, such as uniformity and stability. Excellent energy resolution obtained, reaching 11% FWHM for 5.9 keV photon peak the55Fe X-ray source 1.8% (with possible evidence less than 1%) 5.5 MeV alpha 241Am source. The Microbulk detector shows several advantages like flexible structure, low material high radio-purity, opening thus...
The energy-dependent cross section of the ^{7}Be(n,α)^{4}He reaction, interest for so-called cosmological lithium problem in big bang nucleosynthesis, has been measured first time from 10 meV to keV neutron energy. challenges posed by short half-life ^{7}Be and low reaction have overcome at n_TOF thanks an unprecedented combination extremely high luminosity good resolution beam new experimental area (EAR2) facility CERN, availability a sufficient amount chemically pure ^{7}Be, specifically...
At the neutron time-of-flight facility n_TOF at CERN a new vertical beam line was constructed in 2014, order to extend experimental possibilities this an even wider range of challenging cross-section measurements interest astrophysics, nuclear technology and medical physics. The design hall based on FLUKA Monte Carlo simulations, aiming maximizing flux, reducing halo minimizing background from neutrons interacting with collimator or back-scattered dump. present paper gives overview relevant...
We report on the measurement of ^{7}Be(n,p)^{7}Li cross section from thermal to approximately 325 keV neutron energy, performed in high-flux experimental area (EAR2) n_TOF facility at CERN. This reaction plays a key role lithium yield big bang nucleosynthesis (BBN) for standard cosmology. The only two previous time-of-flight measurements this did not cover energy window interest BBN, and they showed large discrepancy between each other. was with Si telescope high-purity sample produced by...
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$$%$ resolution 20 bins per energy decade show fair agreement Evaluated Nuclear Data...
Neutron-induced fission cross sections for 242,243Cm and 241Am have been obtained with the surrogate reaction method. Recent results neutron-induced section of 243Cm are questioned by present data. For first time, 242Cm has determined up to onset second-chance fission. The good agreement at lowest excitation energies between existing data indicates that distributions in spin parity states populated both techniques similar.
We have measured the neutron capture cross sections of stable magnesium isotopes ${}^{24,25,26}$Mg in energy range interest to $s$ process using time-of-flight facility n_TOF at CERN. Capture events from a natural metal sample and samples enriched ${}^{25}$Mg ${}^{26}$Mg were recorded total method based on C${}_{6}$${}^{2}$H${}_{6}$ detectors. Neutron resonance parameters extracted by simultaneous shape analysis present data existing transmission isotopic sample. Maxwellian-averaged for...
The ($n,\ensuremath{\gamma}$) 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...
To satisfy the world's constantly increasing demand for energy, a suitable mix of different energy sources has to be devised. In this scenario, an important role could played by nuclear provided that major safety, waste and proliferation issues affecting current reactors are satisfactorily addressed. purpose, large effort been under way few years towards development advanced systems with aim closing fuel cycle. Generation IV reactors, full or partial recycling capability, accelerator driven...
The $^{63}$Ni($n, \gamma$) cross section has been measured for the first time at neutron time-of-flight facility n\_TOF CERN from thermal energies up to 200 keV. In total, capture kernels of 12 (new) resonances were determined. Maxwellian Averaged Cross Sections calculated kT = 5 keV 100 with uncertainties around 20%. Stellar model calculations a 25 M$_\odot$ star show that new data have significant effect on $s$-process production $^{63}$Cu, $^{64}$Ni, and $^{64}$Zn in massive stars,...
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.
Radioactive beams of $^{14}$O and $^{15}$O were used to populate the resonant states 1/2$^+$, 5/2$^+$ $0^-,1^-,2^-$ in unbound $^{15}$F $^{16}$F nuclei respectively by means proton elastic scattering reactions inverse kinematics. Based on their large spectroscopic factor values, can be viewed as a core plus 2s$_{1/2}$ or 1d$_{5/2}$ shell neutron 1p$_{1/2}$. Experimental energies derive strength 2s$_{1/2}$-1p$_{1/2}$ 1d$_{5/2}$-1p$_{1/2}$ proton-neutron interactions. It is found that former...
This work reports on accurate, high-resolution measurements of the $^{25}$Mg($n, \gamma$)$^{26}$Mg and tot$) cross sections in neutron energy range from thermal to about 300 keV, leading a significantly improved parametrization. The relevant resonances for $n+^{25}$Mg were characterized combined R-matrix analysis experimental data. resulted an unambiguous spin/parity assignment corresponding excited states $^{26}$Mg. With this information upper limits reaction rates $^{22}$Ne($\alpha,...