Publications (96)33.78 Total impact
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Article: Simultaneous measurement of the neutron capture and fission yields of 233-U
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ABSTRACT: We have measured the neutron capture and fission cross section of 233 U at the neutron time-of-flight facility n TOF at CERN in the energy range from 1 eV to 1 MeV with high accuracy by using a high performance 4π BaF 2 Total Absorption Calorimeter (TAC) as a detection device. The method, based on the TAC energy response study, allowing to disentangle between γ's originating from fission and capture will be presented as well as the first very preliminary results.N. Colonna J. Cox C. Domingo-Pardo International Atomic Energy Agency. ; 1213151623(22):17-18. -
Article: Experimental challenges for the Re/Os clock
Proceedings of the International Symposium on Nuclear Astrophysics - Nuclei in the Cosmos - IX. 25-30 June 2006, CERN. 04/2013; -1:55. -
Article: Au(n,gamma) - the making of a new standard
Proceedings Of Science. Nuclear Astrophysics - Nuclei in the Cosmos IX. 04/2013; -1:80. -
Article: Measurement of the neutron-induced fission cross-section of 241Am at the time-of-flight facility n_TOF
European Physical Journal A 01/2013; 49(1):1-6. · 2.19 Impact Factor -
Article: The $^93$Zr($n,$gamma$$) reaction up to 8 keV neutron energy
Phys. Rev. C. 01/2013; 87(1):014622. -
Article: Neutron-induced fission cross-section of 233U in the energy range 0.5 < En < 20 MeV
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ABSTRACT: The neutron-induced fission cross-section of 233U has been measured at the CERN n_TOF facility relative to the standard fission cross-section of 235U between 0.5 and 20MeV. The experiment was performed with a fast ionization chamber for the detection of the fission fragments and to discriminate against a \alpha -particles from the natural radioactivity of the samples. The high instantaneous flux and the low background of the n_TOF facility result in data with uncertainties of » \approx 3% , which were found in good agreement with previous experiments. The high quality of the present results allows to improve the evaluation of the 233U (n,f) cross-section and, consequently, the design of energy systems based on the Th/U cycle.European Physical Journal A 05/2012; 47(1):1-7. · 2.19 Impact Factor -
Article: Neutron-induced fission cross section of $^245$Cm: New results from data taken at the time-of-flight facility n$_$TOF
Phys. Rev. C. 03/2012; 85(3):034616. -
Article: Neutron-induced fission cross section measurement of U-233, Am-241 and Am-243 in the energy range 0.5 MeV <= E-n <= 20 MeV at n_TOF at CERN
Physica Scripta 01/2012; T150. · 1.20 Impact Factor -
Article: Neutron-induced fission cross section measurement of U-233, Am-241 and Am-243 in the energy range 0.5 MeV <= E-n <= 20 MeV at n_TOF at CERN
Physica Scripta 01/2012; T150. · 1.20 Impact Factor -
Article: 96Zr(n, γ) measurement at the n_TOF facility at CERN
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ABSTRACT: The (n, γ) cross section of 96Zr has been investigated at the CERN n_TOF spallation neutron source. High-resolution time-of-flight measurements using an enriched ZrO2 sample allowed us to analyze 15 resonances below 40 keV with improved accuracy. On average, the capture widths were found to be 25% smaller than reported in earlier experiments. If complemented with the contribution by direct radiative capture, the derived Maxwellian averaged cross sections are consistent with activation data at kT=25 keV. The present results confirm the astrophysical implications for the s-process branching at 95Zr.Phys. Rev. C. 11/2011; 84(5). -
Article: Measurement of the 236U(n,f) cross section from 170 meV to 2 MeV at the CERN n_TOF facility
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ABSTRACT: The neutron-induced fission cross section of 236U was measured at the neutron Time-of-Flight (n_TOF) facility at CERN relative to the standard 235U(n,f) cross section for neutron energies ranging from above thermal to several MeV. The measurement, covering the full range simultaneously, was performed with a fast ionization chamber, taking advantage of the high resolution of the n_TOF spectrometer. The n_TOF results confirm that the first resonance at 5.45 eV is largely overestimated in some nuclear data libraries. The resonance triplet around 1.2 keV was measured with high resolution and resonance parameters were determined with good accuracy. Resonances at high energy have also been observed and characterized and different values for the cross section are provided for the region between 10 keV and the fission threshold. The present work indicates various shortcomings of the current nuclear data libraries in the subthreshold region and provides the basis for an accurate re-evaluation of the 236U(n,f) cross section, which is of great relevance for the development of emerging or innovative nuclear reactor technologies.Phys. Rev. C. 10/2011; 84(4). -
Article: Astrophysics at n_TOF Facility at CERN
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ABSTRACT: The neutron time of flight (n_TOF) facility at CERN is a spallation neutron source with white neutron energy spectrum (from thermal to several GeV), covering the full energy range of interest for nuclear astrophysics, in particular for measurements of the neutron capture cross section required in s-process nucleosynthesis. This contribution presents an overview on the astrophysical program carried on at the n_TOF facility, the main results and their implications.Journal of Physics Conference Series 09/2011; 312(4):042024. -
Article: Neutron-induced fission cross section of natPb and 209Bi from threshold to 1 GeV: An improved parametrization
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ABSTRACT: Neutron-induced fission cross sections for natPb and 209Bi 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 the first results for these nuclei above 200 MeV. The cross sections were measured relative to 235U and 238U in a dedicated fission chamber with parallel plate avalanche counter detectors. Results are compared with previous experimental data. Upgraded parametrizations of the cross sections are presented, from threshold energy up to 1 GeV. The proposed new sets of fitting parameters improve former results along the whole energy range.Phys. Rev. C. 04/2011; 83(4). -
Article: 197Au(n,γ) cross section in the unresolved resonance region
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ABSTRACT: The cross section of the reaction 197Au(n,γ) was measured with the time-of-flight technique at the n_TOF (neutron time-of-flight) facility in the unresolved resonance region between 5 and 400 keV using a pair of C6D6 (where D denotes 2H) liquid scintillators for the detection of prompt capture γ rays. The results with a total uncertainty of 3.9%–6.7% for a resolution of 20 bins per energy decade show fair agreement with the Evaluated Nuclear Data File Version B-VII.0 (ENDF/B-VII.0), which contains the standard evaluation. The Maxwellian-averaged cross section (MACS) at 30 keV is in excellent agreement with the one according to the ENDF/B-VII.0 evaluation and 4.7% higher than the MACS measured independently by activation technique. Structures in the cross section, which had also been reported earlier, have been interpreted as being due to clusters of resonances.Phys. Rev. C. 03/2011; 83(3). -
Article: Measurement of the neutron-induced fission cross- section of 243Am relative to 235U from 0.5 to 20 MeV
The European Physical Journal A. 01/2011; Eur. Phys. J. A (2011) 47: 160. -
Article: (197)Au(n,gamma) cross section in the unresolved resonance region
Physical Review C. 01/2011; 83(3). -
Article: (197)Au(n,gamma) cross section in the unresolved resonance region
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ABSTRACT: The cross section of the reaction (197)Au(n,gamma) was measured with the time-of-flight technique at the n_TOF (neutron time-of-flight) facility in the unresolved resonance region between 5 and 400 keV using a pair of C(6)D(6) (where D denotes (2)H) liquid scintillators for the detection of prompt capture gamma rays. The results with a total uncertainty of 3.9%-6.7% for a resolution of 20 bins per energy decade show fair agreement with the Evaluated Nuclear Data File Version B-VII.0 (ENDF/B-VII.0), which contains the standard evaluation. The Maxwellian-averaged cross section (MACS) at 30 keV is in excellent agreement with the one according to the ENDF/B-VII.0 evaluation and 4.7% higher than the MACS measured independently by activation technique. Structures in the cross section, which had also been reported earlier, have been interpreted as being due to clusters of resonances.Physical Review C. 01/2011; 83(3). -
Article: Neutron-induced fission cross section of 234U and 237Np measured at the CERN Neutron Time-of-Flight (n_TOF) facility
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ABSTRACT: A high-resolution measurement of the neutron-induced fission cross section of 234U and 237Np has been performed at the CERN Neutron Time-of-Flight facility. The cross sections have been determined in a wide energy range from 1 eV to 1 GeV using the evaluated 235U cross section as reference. In these measurements the energy determination for the 234U resonances could be improved, whereas previous discrepancies for the 237Np resonances were confirmed. New cross-section data are provided for high neutron energies that go beyond the limits of prior evaluations, obtaining important differences in the case of 237Np.Phys. Rev. C. 09/2010; 82(3). -
Article: $^197mathrmAu$($n,$gamma$$) cross section in the resonance region
Phys. Rev. C. 04/2010; 81(4):044616. -
Article: $^197mathrmAu$($n,$gamma$$) cross section in the resonance region
Phys. Rev. C. 04/2010; 81(4):044616.
Top co-authors
Top Journals
Institutions
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1970–200711
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University of Ioannina
- Τμήμα Φυσικής
Ioánnina, Ipeiros, Greece
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2012
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International Atomic Energy Agency (IAEA)
- Section of Nuclear Data
Vienna, Vienna, Austria
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2011
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University of Lodz
Łódź, Lodz Voivodeship, Poland
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2007
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Université Bordeaux 1
Talence, Aquitaine, France
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