Philippe Dessagne
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View article: In-beam <i>γ</i>-ray spectroscopy with fast neutron probes at NFS
In-beam <i>γ</i>-ray spectroscopy with fast neutron probes at NFS Open
Using the high flux of fast neutron beam provided at the Neutrons For Science (NFS) facility of GANIL-SPIRAL2, high resolution γ -ray spectroscopy of nuclei produced in the (n,xn) reactions is performed with the EXOGAM HPGe array. The nucl…
View article: Using Neural Networks for Inelastic Neutron Scattering Cross Sections Interpretation
Using Neural Networks for Inelastic Neutron Scattering Cross Sections Interpretation Open
The necessary improvement of evaluated nuclear data for nuclear applications development is possible through new and high-quality experimental measurements. In particular, improving (n, n’) cross-section evaluations for faster neutrons tha…
View article: Producing uncertainties and covariance matrix from intermediate data using a Monte-Carlo method
Producing uncertainties and covariance matrix from intermediate data using a Monte-Carlo method Open
The necessary improvement of evaluated nuclear data for nuclear applications development is possible through new and high quality experimental measurements. In particular, improving (n, n’) cross section evaluations for fast neutrons is a …
View article: Producing uncertainties and covariance matrix from intermediate data using a Monte-Carlo method
Producing uncertainties and covariance matrix from intermediate data using a Monte-Carlo method Open
The necessary improvement of evaluated nuclear data for nuclear applications development is possible through new and high quality experimental measurements. In particular, improving (n, n’) cross section evaluations for fast neutrons is a …
View article: Towards improvement of the <sup>238</sup>U level scheme using γ-spectroscopy of the (n, n’γ) reaction
Towards improvement of the <sup>238</sup>U level scheme using γ-spectroscopy of the (n, n’γ) reaction Open
Better knowledge of the neutron population in reactors is crucial to improve the accuracy of neutronics simulations of present day or future reactor cores. This population is partially driven by (n, xn) reactions. However, the cross sectio…
View article: Microscopic modeling of direct pre-equilibrium emission: Impact on exclusive and inclusive (n,<i>x</i>n) and fission channels
Microscopic modeling of direct pre-equilibrium emission: Impact on exclusive and inclusive (n,<i>x</i>n) and fission channels Open
We report on a microscopic modeling of the first order of multistep direct emission based on one phonon excitations, given by the QRPA model, and an effective in-medium nucleon nucleon interaction, described within the JLM folding model. T…
View article: Using the Monte-Carlo method to analyze experimental data and produce uncertainties and covariances
Using the Monte-Carlo method to analyze experimental data and produce uncertainties and covariances Open
The production of useful and high-quality nuclear data requires measurements with high precision and extensive information on uncertainties and possible correlations. Analytical treatment of uncertainty propagation can become very tedious …
View article: On the need for precise nuclear structure data for high quality (n, n’γ) cross-section measurements
On the need for precise nuclear structure data for high quality (n, n’γ) cross-section measurements Open
The necessary improvement of evaluated nuclear data for nuclear applications development is possible through new and high-quality measurements, often combined with appropriate nuclear-reaction modelling. In particular, improving inelastic …
View article: Measurement of <sup>183</sup>W(n, n’γ) and (n, 2nγ) cross-sections (preliminary)
Measurement of <sup>183</sup>W(n, n’γ) and (n, 2nγ) cross-sections (preliminary) Open
The necessary improvement of evaluated nuclear databases for appplication will be achieved with improvement of models and new, precise data. In particular, the effect of inelastic neutrons scattering can be of importance for reactors. In o…
View article: Measurement of partial (n, n’γ) reaction cross-sections on highly radioactive nuclei of interest for energy production
Measurement of partial (n, n’γ) reaction cross-sections on highly radioactive nuclei of interest for energy production Open
In the context of the development of Gen. IV nuclear reactors, the GIF (Generation IV. International Forum) has selected six innovative technologies. Among them, one can highlight the concept of breeding for 232 Th/ 233 U and 238 U/ 239 Pu…
View article: From <sup>232</sup>Th(n, n’γ) cross sections to level production and total neutron inelastic scattering cross sections
From <sup>232</sup>Th(n, n’γ) cross sections to level production and total neutron inelastic scattering cross sections Open
To probe the neutron inelastic scattering off 232 Th, an experiment took place at the EC-JRC Geel conducted with the experimental setup GRAPhEME to detect emitted γ-rays. The prompt γ-ray spectroscopy method was used and 70 experimental 23…
View article: GRAPhEME: Performances, achievements (@EC-JRC/GELINA) and future (@GANIL/SPIRAL2/NFS)
GRAPhEME: Performances, achievements (@EC-JRC/GELINA) and future (@GANIL/SPIRAL2/NFS) Open
GRAPhEME is a γ-spectrometer developed by CNRS/IPHC Strasbourg (France), in collaboration with EC-JRC Geel (Belgium) and IFIN-HH Bucharest (Romania). With its 6 High Purity Planar Germanium detectors and one fission chamber, GRAPhEME, inst…
View article: Neutron-induced inelastic γ-production cross sections on <sup>58,60,64</sup>Ni
Neutron-induced inelastic γ-production cross sections on <sup>58,60,64</sup>Ni Open
This paper reports partial results of a (n, n’γ) measurement on nickel. The inelastic channel was measured using the Gamma Array for Inelastic Neutron Scattering (GAINS) spectrometer at the 100-m measurement cabin of the Geel Electron Line…
View article: The past and the future of the GAINS spectrometer @ GELINA
The past and the future of the GAINS spectrometer @ GELINA Open
GAINS (Gamma Array for Inelastic Neutron Scattering), currently installed at the GELINA (Geel Electron Linear Accelerator) neutron source of the EC-JRC (European Commission-Joint Research Centre), is one of the best instruments available w…
View article: A new measurement on <sup>56</sup>Fe(n,inl) using GAINS@GELINA
A new measurement on <sup>56</sup>Fe(n,inl) using GAINS@GELINA Open
The extended dataset of 56 Fe(n,n’γ) cross sections measured by our group more than a decade ago at GELINA (Geel Linear Accelerator) was used in many recent evaluations like ENDF, JEFF and CIELO. Despite the special measures we took to ens…
View article: MEASUREMENT OF <sup>182,184,186</sup>W (N, N’ γ) CROSS SECTIONS AND WHAT WE CAN LEARN FROM IT
MEASUREMENT OF <sup>182,184,186</sup>W (N, N’ γ) CROSS SECTIONS AND WHAT WE CAN LEARN FROM IT Open
Today’s development of nuclear installations rely on numerical simulation for which the main input are evaluated nuclear data. Inelastic neutron scattering (n, x n) is a reaction of importance because it modifies the neutron population, th…
View article: Measurement of $^{182,184,186}$w (n, n' γ) cross sections and what we can learn from it
Measurement of $^{182,184,186}$w (n, n' γ) cross sections and what we can learn from it Open
International audience
View article: High precision neutron inelastic cross sections on<sup>16</sup>O
High precision neutron inelastic cross sections on<sup>16</sup>O Open
This work reports partial results of a (n, n γ ) measurement on 16 O. The γ rays of interest from the inelastic channel were detected using the Gamma Array for Inelastic Neutron Scattering (GAINS) spectrometer at the Geel Electron Linear A…
View article: Neutron inelastic cross section measurements on <sup>58,60</sup>Ni
Neutron inelastic cross section measurements on <sup>58,60</sup>Ni Open
A natural nickel sample was used at the GELINA (Geel Electron LINear Accelerator) neutron source of the European Commission, Joint Research Centre, Geel to measure the neutron inelastic cross sections. The GAINS (Gamma Array for Inelastic …
View article: Neutron inelastic cross section measurements on <sup>54</sup>Fe
Neutron inelastic cross section measurements on <sup>54</sup>Fe Open
A 54 Fe(n, n'γ) cross section measurement was performed at the Geel Electron LINear Accelerator of EC-JRC, Geel using the Gamma Array for Inelastic Neutron Scattering spectrometer and a 235 U fission chamber for flux normalization. The exp…
View article: Uncertainty quantification and sensitivity studies on Thorium-fueled reactors
Uncertainty quantification and sensitivity studies on Thorium-fueled reactors Open
This paper shows how Total Monte Carlo (TMC) method and Perturbation Theory (PT) can be applied to quantify uncertainty due to nuclear data on reactor static calculations of integral parameters such as k eff and β eff . This work focuses o…
View article: What can we learn from (n,<i>x</i>n<i>γ</i>) cross sections about reaction mechanism and nuclear structure?
What can we learn from (n,<i>x</i>n<i>γ</i>) cross sections about reaction mechanism and nuclear structure? Open
Inelastic (n,n') cross section is a key quantity to accurately simulate reactor cores, and its precision was shown to need significant improvements. To bypass the experimental difficulties to detect neutrons from (n,xn) reaction and to dis…
View article: New equipment for neutron scattering cross-section measurements at GELINA
New equipment for neutron scattering cross-section measurements at GELINA Open
Two new experimental setups are being developed at European Commission’s Joint Research Centre in Geel, Belgium. The scintillator array ELISA (ELastic and Inelastic Scattering Array) is for high-quality neutron scattering cross section and…
View article: Neutron inelastic scattering of <sup>232</sup>Th: measurements and beyond
Neutron inelastic scattering of <sup>232</sup>Th: measurements and beyond Open
Gamma production cross sections have been obtained for 81 transitions in 232 Th from (n,n’γ), 11 in 231 Th from (n,2nγ) and 7 in 230 Th from (n,3nγ) reactions using prompt gamma spectroscopy. Incident neutron energies were determined using…
View article: Preliminary results of proton inelastic scattering on 57Fe
Preliminary results of proton inelastic scattering on 57Fe Open
International audience
View article: How to produce accurate inelastic cross sections from an indirect measurement method?
How to produce accurate inelastic cross sections from an indirect measurement method? Open
Inelastic reactions ((n,xn) for x ≥ 1) play a key role in reactor cores as they influence the slowing down of the neutrons. A reactor neutron energy spectrum depends thus on this process which is in strong competition with elastic scatteri…
View article: Neutron inelastic scattering measurements on the stable isotopes of titanium
Neutron inelastic scattering measurements on the stable isotopes of titanium Open
The results of a neutron inelastic scattering experiment performed at the GELINA (Geel Electron Linear Accelerator) pulsed white neutron source of the EC-JRC (European Commission Joint Research Centre) are reported. The neutrons with energ…
View article: (n,xn<b>γ</b>) cross sections on actinides versus reaction code calculations
(n,xn<b>γ</b>) cross sections on actinides versus reaction code calculations Open
The experimental setup GRAPhEME (GeRmanium array for Actinides PrEcise MEasurements) has been used at GELINA (EC-JRC, Geel, Belgium) to perform (n,xn γ) cross sections measurements. GRAPhEME has been especially designed to take into accoun…
View article: Proton inelastic scattering cross section measurements on<sup>16</sup>O and<sup>28</sup>Si
Proton inelastic scattering cross section measurements on<sup>16</sup>O and<sup>28</sup>Si Open
A (p, p′γ) experiment was performed at the Tandem accelerator of IFIN-HH (Bucharest) with the purpose of measuring the proton inelastic cross-sections on 16O and 28Si. The goal was to investigate to which extent the neutron cross-sections …