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4. Une forme atypique d’atteinte oculaire dans la maladie de la griffe du chat

Author

P.-Y. Robert, O. Buil, E. Tabouret, and G. Barreau

Subjects
medicine.medical_specialty, Bartonella henselae, biology, business.industry, Retinitis, Cat-scratch disease, Eye infection, biology.organism_classification, medicine.disease, Dermatology, 03 medical and health sciences, Ophthalmology, 0302 clinical medicine, Bacterial etiology, 030220 oncology & carcinogenesis, medicine, 030223 otorhinolaryngology, business
Published
2016
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5. Neutron capture cross section measurements of 232Th in the 30-600 keV energy range

Author

S. Andriamonje, V. Lacoste, C. Marchand, M.S. Pravikoff, M. Petit, D. Karamanis, R. Del Moral, M. Bercion, G. Barreau, S. Czajkowski, Β. Blank, J. C. Thomas, and G. Giovinazzo

Subjects
Nuclear physics, Range (particle radiation), Materials science, Neutron cross section, Energy (signal processing)
Abstract

Neutron capture cross sections of 232T/i have been measured relative to 197Au in the energy region from 30 keV to 600 keV. The neutron source was the reaction 7Li(p, n) produced on the 4 MV Van de Graaff Accelerator of the Centre d' Etudes Nucléaires de Bordeaux (CENBG). Preliminary analysis of the measurements indicates that the cross sections are closer to the JENDL database values.

Published
2019
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6. The extrapolated-efficiency method, a new technique to determine the detection efficiency in experiments based on the surrogate-reaction method

Author

I. Companis, G. Barreau, C. Theroine, G. Boutoux, L. Mathieu, M. Aïche, Beatriz Jurado, O. Roig, V. Méot, A. Blanc, Aval du cycle et Energie Nucléaire (ACEN), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
Physics, Nuclear and High Energy Physics, Work (thermodynamics), 010308 nuclear & particles physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Computational physics, Weighting, Cascade, 0103 physical sciences, Neutron, 010306 general physics, Indirect Technique, Instrumentation, Energy (signal processing)
Abstract

The surrogate-reaction method is an indirect technique to extract neutron-induced cross-sections of short-lived nuclei. In the last years several experiments have been performed to investigate whether this technique can be applied to infer radiative-capture cross-sections. A major difficulty in this type of measurements is the determination of the gamma-cascade detection efficiency. The pulse-height weighting technique (PHWT) has been previously used to determine this quantity in surrogate experiments. In this work, we present a new method to determine the gamma-cascade detection efficiency in the vicinity of the neutron-separation energy that is much simpler than the PHWT. We also investigate the possibility to apply this new technique in standard experiments using neutron beams.

Published
2013
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7. Investigation of theU238(d,p)surrogate reaction via the simultaneous measurement ofγ-decay and fission probabilities

Author

B. Jurado, S. J. Rose, O. Roig, F. Gunsing, Trine Wiborg Hagen, Q. Ducasse, Magne Guttormsen, G. Barreau, A. C. Larsen, Olivier Serot, G. Boutoux, Sunniva Siem, J. N. Wilson, S. Czajkowski, Jin Lei, M. Aiche, Gry Merete Tveten, Therese Renstrøm, I. Tsekhanovich, Tamas Gabor Tornyi, L. Mathieu, F. Giacoppo, M. Wiedeking, M. Lebois, Andreas Görgen, Paola Marini, A. M. Moro, V. Méot, and B. Morillon

Subjects
Physics, Angular momentum, 010308 nuclear & particles physics, Fission, Nuclear Theory, Statistical model, Breakup, 01 natural sciences, 7. Clean energy, Nuclear physics, Deuterium, 0103 physical sciences, Atomic physics, Born approximation, Nuclear Experiment, 010306 general physics, Uncertainty analysis
Abstract

We investigated the U238(d,p) reaction as a surrogate for the n+U238 reaction. For this purpose we measured for the first time the γ-decay and fission probabilities of U∗239 simultaneously and compared them to the corresponding neutron-induced data. We present the details of the procedure to infer the decay probabilities, as well as a thorough uncertainty analysis, including parameter correlations. Calculations based on the continuum-discretized coupled-channels method and the distorted-wave Born approximation (DWBA) were used to correct our data from detected protons originating from elastic and inelastic deuteron breakup. In the region where fission and γ emission compete, the corrected fission probability is in agreement with neutron-induced data, whereas the γ-decay probability is much higher than the neutron-induced data. We have performed calculations of the decay probabilities with the statistical model and of the average angular momentum populated in the U238(d,p) reaction with the DWBA to interpret these results.

Published
2016
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8. Intracameral cefuroxime injection at the end of cataract surgery to reduce the incidence of endophthalmitis: French study

Author

Jean-Paul Adenis, Benoît Marin, Pierre-Yves Robert, G Barreau, and Marcelle Mounier

Subjects
Male, medicine.medical_specialty, medicine.medical_treatment, Eye Infections, Bacterial, Postoperative Complications, Endophthalmitis, Lens Implantation, Intraocular, Risk Factors, medicine, Humans, Prospective Studies, Antibiotic prophylaxis, Prospective cohort study, Aged, Cefuroxime, Phacoemulsification, business.industry, Incidence, Incidence (epidemiology), Antibiotic Prophylaxis, Eye infection, Cataract surgery, medicine.disease, Sensory Systems, Anti-Bacterial Agents, Surgery, Ophthalmology, Intravitreal Injections, Female, France, business, medicine.drug
Abstract

To determine whether an intracameral injection of cefuroxime at the end of cataract surgery decreases the incidence of postoperative endophthalmitis.Dupuytren Hospital, Ophthalmology Department, Limoges, France.Clinical trials.Patients having cataract surgery between April 2003 and June 2008 were included in a survey of operative-site infection. Intracameral cefuroxime injections started in June 2006. Preoperative data (beta-lactam allergy, a history of endophthalmitis, age, sex), intraoperative data (use of trypan blue, use of capsular ring or iris retractors, surgical time, senior or junior surgeon, corticosteroid injection, iris retractors), and the incidence of postoperative infections at 8 days and 1 month were prospectively collected.During the inclusion period, 5115 patients had cataract surgery; 2289 received cefuroxime and 2826 did not. The incidence of endophthalmitis was 35 (1.238%) of 2826 patients without intracameral cefuroxime and 1 (0.044%) of 2289 patients with intracameral cefuroxime; the difference was statistically significant (P.0001). No intraoperative factor was significantly associated with postoperative infection. No allergic reaction was reported.Intracameral cefuroxime injection at the end of cataract surgery was safe and significantly decreased the incidence of endophthalmitis.No author has a financial or proprietary interest in any material or method mentioned.

Published
2012
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9. Experimental Approaches to Studying the Fission Process Using the Surrogate Reaction Technique

Author

L. A. Bernstein, I. Companis, S. Czajkowski, V. Méot, Jason Burke, L. W. Phair, M. Aiche, L. Mathieu, Jutta Escher, I J Thompson, J. M. Gostic, D. Bluel, Roger Henderson, T. J. Ross, C. W. Beausang, J. Munson, G. Barreau, Bethany L. Goldblum, B. Hass, O. Roig, N. D. Scielzo, C. T. Angell, Jennifer J. Ressler, N. Cappelan, Beatriz Jurado, M. Weideking, R. Hughes, Robert Hatarik, Lawrence Livermore National Laboratory (LLNL), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Aval du cycle et Energie Nucléaire (ACEN), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Fission, Surrogate reaction, Cross section, 010308 nuclear & particles physics, Nuclear Theory, Nuclear data, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, 238Pu, 0103 physical sciences, ND2010, Nuclear science, Nuclear Experiment, 010306 general physics, National laboratory, Humanities
Abstract

J. T. Burke, ∗ J. J. Ressler, J. E. Escher, N. D. Scielzo, I. J. Thompson, R. Henderson, J. Gostic, L. Bernstein, D. Bluel, M. Weideking, V. Meot, O. Roig, L. W. Phair, R. Hatarik, J. Munson, 4 C. Angell, B. Goldblum, C. W. Beausang, T. Ross, R. Hughes, M. Aiche, G. Barreau, N. Cappelan, S. Czajkowski, B. Hass, B. Jurado, L. Mathieu and I. Companis 8 Physics Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA Service de Physique Nucleaire, Commissariat a l’Energie Atomique, Bruyeres-le-Chatel, Arpajon, France Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA Department of Nuclear Engineering, University of California, Berkeley, California 94720, USA Nuclear Physics Department, University of Richmond, Richmond, Virginia 23173, USA Centre d’Etudes Nucleaires Bordeaux Gradignan, CNRS/IN2P3, Univ. Bordeaux 1, Chemin du Solarium, 33175 GRADIGNAN, France Centre d’Etudes Nuclaires Bordeaux Gradignan, CNRS/IN2P3, Univ. Bordeaux 1, Chemin du Solarium, 33175 GRADIGNAN, France Horia Hulubei National Institute for Physics and Nuclear Engineering, 077125 Bucharest-Magurele, Romania

Published
2011
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10. Neutron-Induced Capture Cross Sections via the Surrogate Reaction Method

Author

M. Aiche, F. Gunsing, V. Méot, Jason Burke, N. Capellan, S. Czajkowski, I. Matea, L. Tassan-Got, I. Companis, L. Gaudefroy, C. Theroine, J. Taieb, J. M. Daugas, O. Roig, X. Derkx, L. Mathieu, G. Boutoux, B. Haas, E. Bauge, M. G. Porquet, N. Pillet, Olivier Serot, G. Barreau, P. Romain, A. Bail, T. Faul, Beatriz Jurado, D. Dassi, P. Morel, Aval du cycle et Energie Nucléaire (ACEN), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear physics, Materials science, General Physics and Astronomy, Neutron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy
Abstract

Measurement at the Tandem accelerator of the IPN Orsay; The surrogate reaction method is an indirect way of determining cross sections for nuclear reactions that proceed through a compound nucleus. This technique enablesneutron-induced cross sections to be extracted for nuclear reactions on short-lived unstable nuclei that otherwise can not be measured. This technique has been succesfully applied to determine the neutron-induced fission cross sections of several short-lived nuclei. In this work we investigate whether this powerful technique can also be used to determine of neutron-induced capture cross sections. For this purpose we use the surrogate reaction 174Yb(3He,pγ)176Lu to infer the well known 175Lu(n,γ) cross section and compare the results with the directly measured neutron-induced data. This surrogate experiment has been performed in March 2010. The experimental technique used and the first preliminary results will be presented.

Published
2011
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11. Investigation of the U 238 ( d , p ) surrogate reaction via the simu

Author

Q. Ducasse, B. Jurado, M. Aïche, P. Marini, L. Mathieu, A. Görgen, M. Guttormsen, A. C. Larsen, T. Tornyi, J. N. Wilson, G. Barreau, G. Boutoux, S. Czajkowski, F. Giacoppo, F. Gunsing, T. W. Hagen, M. Lebois, J. Lei, V. Méot, B. Morillon, A. M. Moro, T. Renstrøm, O. Roig, S. J. Rose, O. Sérot, S. Siem, I. Tsekhanovich, G. M. Tveten, and M. Wiedeking

Published
2016
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12. Improvements in the in-beam γ-ray spectroscopy provided by an ancillary detector coupled to a Ge γ-spectrometer: the DIAMANT-EUROGAM II example

Author

D. Curien, A. Brondi, J. N. Scheurer, M. Harston, T.P. Doan, M. M. Aléonard, J.F. Chemin, D. Boivin, R. Moro, F. Bourgine, D. Cabaussel, M. Aiche, Emanuele Vardaci, G. La Rana, J.P. Goudour, G. Barreau, J. N., Scheurer, M., Aiche, M. M., Aleonard, G., Barreau, F., Bourgine, D., Boivin, D., Cabaussel, J. F., Chemin, T. P., Doan, J. P., Goudour, M., Harston, Brondi, Augusto, LA RANA, Giovanni, Moro, RENATA EMILIA MARIA, Vardaci, Emanuele, and D., Curien

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, business.industry, Detector, scintillation detector, Scintillator, Doppler shift correction, gamma ray spectroscopy, Charged particle, Nuclear physics, symbols.namesake, Optics, symbols, Gamma spectroscopy, Spectroscopy, business, charged particle spectrometer, Instrumentation, Doppler effect, Beam (structure)
Abstract

For the first time the 4π γ-ray spectrometer EUROGAM II has been coupled to a 4π light charged particle detector array, DIAMANT, during a test experiment on the reaction 32 S + 58 Ni at 120 MeV beam energy. A very large improvement in the peak-to-background ratio of the γ-spectra has been found when EUROGAM II is triggered by DIAMANT to select an exit channel. A simple algebra has been developed which provides theoretical estimates in good agreement with these experimental results. It is demonstrated that, depending on both the γ-spectrometer and ancillary detector performances, much better peak-to-background can be obtained by such a coupling. For the same peak-to-background ratio, the use of an ancillary detector allows for a lower γ-ray coincidence level and therefore improves the statistics. Ways to select the most appropriate ancillary detector are given. The ability of the ancillary detector to provide a total Doppler shift correction is crucial for the improvement of the peak-to-background ratio.

Published
1997
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13. MR imaging of Schmorl's nodes: Imaging characteristics and epidemio-clinical relationships

Author

M Moustarhfir, B. Bresson, P. Koch, Benjamin Dallaudière, E. Schouman-Claeys, A. Perozziello, G. Barreau, Phalla Ou, and M.-C. Henry-Feugeas

Subjects
Adult, Male, medicine.medical_specialty, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, Young Adult, 0302 clinical medicine, Internal medicine, medicine, Humans, Radiology, Nuclear Medicine and imaging, Medical history, Prospective Studies, Prospective cohort study, Contraindication, Aged, Aged, 80 and over, Radiological and Ultrasound Technology, business.industry, General Medicine, Middle Aged, medicine.disease, Low back pain, Magnetic Resonance Imaging, Vertebra, Schmorl's nodes, medicine.anatomical_structure, Thoracic vertebrae, Population study, Female, medicine.symptom, business, 030217 neurology & neurosurgery, Intervertebral Disc Displacement
Abstract

Purpose The purpose of our prospective study was to assess the presentation of Schmorl's nodes (SN) on magnetic resonance imaging (MRI) and investigate their possible association with demographic and clinical findings. Materials and methods Three hundred and thirty-three patients were prospectively included. Thirteen (3.9%) patients were excluded because of contraindication to MRI and/or Scheuermann's disease. The final study population included 320 patients. T1-weighted and short TI inversion recovery sequences were performed to assess SN prevalence, the vertebral level and their anatomical distribution in vertebra. Medical history was recorded focusing on previous diseases including degenerative, rheumatoid and neoplastic disease, and any existing spinal traumatism. Epidemiological information was also obtained, including age, gender, ethnicity, professional and sporting activity. Results The final study population included 320 patients (172 men, 148 women) with a mean age of 54 years ± 17.5 (SD) (range: 19–87 years). A total of 421 SN were found in 158/320 patients (49.4%). SN were localized in thoracic spine for 48%, in lumbar spine for 46% and cervical spine for 6%. The middle part of the thoracic vertebra was the most affected area (80%), mostly in the middle superior endplate (41%). SN were more frequently observed in manual workers who worked more than 10 years ( P P = 0.0048). No significant associations were found with gender ( P = 0.17) and remarkable medical history ( P = 0.21). SN were less frequently observed in patients with sport activities of 1–5 hours/week ( P = 0.04) and those with an African origin ( P Conclusion Our study suggests a potential role for ethnical and physical factors in the pathogenesis of SN. Furthers studies are mandatory to evaluate their clinical relevance, especially in patients such as Caucasian manual workers in whom SN have a high prevalence.

Published
2015

14. Fission probabilities ofAm242,Cm243, andCm244induced by transfer reactions

Author

B. Jurado, Paola Marini, I. Tsekhanovich, Q. Ducasse, L. Mathieu, G. Barreau, S. Czajkowski, Grégoire Kessedjian, G. Boutoux, and M. Aiche

Subjects
Physics, Nuclear and High Energy Physics, Transfer (group theory), 010308 nuclear & particles physics, Fission, Nuclear Theory, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, 01 natural sciences
Abstract

We have measured the fission probabilities of $^{242}\mathrm{Am},^{243}\mathrm{Cm}$, and $^{244}\mathrm{Cm}$ induced by the transfer reactions $^{243}\mathrm{Am}(^{3}\mathrm{He},^{4}\mathrm{He}),^{243}\mathrm{Am}(^{3}\mathrm{He},t)$, and $^{243}\mathrm{Am}(^{3}\mathrm{He},d)$, respectively. The details of the experimental procedure and a rigorous uncertainty analysis, including a correlation matrix, are presented. For $^{243}\mathrm{Cm}$ our data show clear structures well below the fission threshold. To our knowledge, it is the first time that these structures have been observed for this nucleus. We have compared the measured fission probabilities to calculations based on the statistical model to obtain information on the fission barriers of the produced fissioning nuclei.

Published
2015
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15. Determination of the 233Pa(n, γ) capture cross section up to neutron energies of 1 MeV using the transfer reaction 232Th(3He, p)234Pa∗

Author

D. Dassié, L. Perrot, E. Berthoumieux, F. Gunsing, S. Czajkowski, S. Boyer, Ch. Theisen, M. Aiche, C. Grosjean, G. Aerts, B. Haas, A. Guiral, J. N. Wilson, N. Thiollière, G. Barreau, and B. Osmanov

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Range (particle radiation), 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Inelastic scattering, Scintillator, 01 natural sciences, 7. Clean energy, Neutron temperature, Charged particle, Cross section (physics), 0103 physical sciences, Neutron, Atomic physics, 010306 general physics
Abstract

The γ -ray emission probability distribution of 234 Pa ∗ has been measured between 5.2 and 6.2 MeV excitation energy using the transfer reaction 232 Th( 3 He, p) 234 Pa ∗ at an incident 3 He energy of 24 MeV. The experimental set-up is made of four liquid scintillator C 6 D 6 detectors and four Si telescopes arranged to detect γ rays and charged particles in coincidence. In order to determine the total number of γ -ray cascades in a given nucleus, the raw experimental detected gamma-ray events have to be corrected by the weighting function technique. This weighting requires complete knowledge of the efficiency and response functions for the C 6 D 6 detector set-up and surroundings. These have been determined experimentally using gamma-ray sources, inelastic scattering reactions and transfer reactions on light nuclei. Simulations which reproduce successfully the detector response and efficiency are presented. From these measurements, the (n, γ ) capture cross section of 233 Pa, in the neutron energy range 0 to 1 MeV, has been deduced via the product of the measured γ emission probability of 234 Pa ∗ with the calculated compound nucleus formation cross section of the reaction 233 Pa + n. A comparison between existing data bases or recent predictions and the present results is also made.

Published
2006
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16. Experimental and simulated efficiency of a HPGe detector with point-like and extended sources

Author

G. Barreau, D. Karamanis, M. Petit, S. Andriamonje, and V. Lacoste

Subjects
Physics, Nuclear and High Energy Physics, Monte Carlo method, Detector, Thorium, chemistry.chemical_element, Germanium, Computational physics, Semiconductor detector, chemistry, Calibration, Point (geometry), Hpge detector, Instrumentation
Abstract

The absolute efficiency of a high purity germanium (HPGe) detector was determined with a point-like calibrated 152 Eu source at two distances from the detector and three pure metallic thorium foils of different thicknesses. The experimental values are compared with the ones determined with the simulation codes MCNP4B and GEANT 3.21. A procedure for HPGe absolute efficiency calibration is proposed for γ -ray energies higher than 200 keV.

Published
2002
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17. Lifetimes of yrast rotational states of the fission fragments 100Zr and 104Mo measured using a differential plunger

Author

B. Cahan, A. Le Coguie, John Durell, N. Schulz, D Patel, M. Petit, B. J. P. Gall, C Theisen, R. Lucas, D. M. Cullen, S. J. Freeman, M. Houry, B. J. Varley, J.C. Lisle, G. S. Simpson, R M Wall, O. Dorvaux, E. Bouchez, G. Barreau, A. G. Smith, J. F. Smith, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Heyd, Yvette

Subjects
Plunger, Physics, Nuclear and High Energy Physics, Range (particle radiation), [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Fission, Picosecond, Yrast, Quadrupole, Gamma ray, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nanosecond, Atomic physics
Abstract

Lifetime measurements have been performed for yrast rotational states of 100Zr and 104Mo using a 252Cf source in a differential plunger arrangement, together with the EUROBALL and SAPHIR multi-detector arrays. The system has been proved capable of covering a range of lifetimes from a nanosecond to a picosecond. The transition quadrupole moments are found to decrease by around 20% between I = 4 and I = 8 in the case of 104Mo while remaining constant in 100Zr. The origin of this effect lies either in a rotation-induced shape change, or in the strong mixing between the ground and s-bands in 104Mo.

Published
2002
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18. Erratum: Isotopic yield distributions of transfer- and fusion-induced fission fromU238+C12reactions in inverse kinematics [Phys. Rev. C88, 024605 (2013)]

Author

K.-H. Schmidt, M. Caamaño, E. Casarejos, M. Rejmund, L. Gaudefroy, G. Barreau, J. Benlliure, L. Audouin, A. K. Shrivastava, A. Chbihi, X. Derkx, C. Golabek, B. Fernández-Domínguez, B. Jurado, A. Navin, T. Roger, C.O. Bacri, O. Delaune, C. Schmitt, F. Farget, and A. Lemasson

Subjects
Physics, Nuclear and High Energy Physics, Fusion, Transfer (group theory), Inverse kinematics, Fission, Computer data analysis, Yield (chemistry), Atomic physics
Published
2014
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20. High-spin structures of 124−131Te: Competition of proton- and neutron-pair breakings

Author

Alain Astier, D. Curien, O. Dorvaux, Ch. Theisen, B.J.P. Gall, G. Duchêne, O. Stezowski, I. Deloncle, N. Redon, Marie-Geneviève Porquet, G. Barreau, M. Houry, F. Azaiez, Ts. Venkova, R. Lucas, Marc Rousseau, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Département Recherches Subatomiques (DRS-IPHC), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Nuclear Theory, Isotope, Fission, Yrast, FOS: Physical sciences, Parity (physics), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Coincidence, Nuclear Theory (nucl-th), Nuclear physics, Nuclear fusion, Neutron, Nuclear Experiment (nucl-ex), Nuclear Experiment, Excitation
Abstract

The 124-131Te nuclei have been produced as fission fragments in two fusion reactions induced by heavy-ions (12C + 238U at 90 MeV bombarding energy and 18O + 208Pb at 85 MeV) and studied with the Euroball array. Their high-spin level schemes have been extended to higher excitation energy from the triple gamma-ray coincidence data. The gamma-gamma angular correlations have been analyzed in order to assign spin and parity values to many observed states. Moreover the half-lives of isomeric states have been measured from the delayed coincidences between the fission-fragment detector SAPhIR and Euroball, as well as from the timing information of the Ge detectors. The behaviors of the yrast structures identified in the present work are first discussed in comparison with the general features known in the mass region, particularly the breakings of neutron pairs occupying the nuh11/2 orbit identified in the neighboring Sn nuclei. The experimental level schemes are then compared to shell-model calculations performed in this work. The analysis of the wave functions shows the effects of the proton-pair breaking along the yrast lines of the heavy Te isotopes., accepted for publication in Eur. Phys. J. A

Published
2014
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21. Development of ionisation chambers for the simultaneous measurement of the neutron-induced capture and fission cross section of 233U

Author

L. Mathieu, G. Barreau, Jan Heyse, F. Gunsing, G. Boutoux, A. J. M. Plompen, I. Tsekhanovitch, M. Aïche, I. Companis, Grégoire Kessedjian, Peter Schillebeeckx, Beatriz Jurado, S. Czajkowski, Vernay, Emmanuelle, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Aval du cycle et Energie Nucléaire (ACEN), and Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Fission, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Astrophysics::High Energy Astrophysical Phenomena, Detector, Nuclear data, Scintillator, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Coincidence, Nuclear physics, Cross section (physics), Computer Science::Hardware Architecture, Ionization, Neutron, Nuclear Experiment, ComputingMilieux_MISCELLANEOUS
Abstract

A new simultaneous measurement of sigma(n,f) and sigma(n,gamma) will be performed at the neutron time-of-flight facility GELINA in Geel (Belgium). The fission events will be detected by a multi-plate high-efficiency ionisation chamber (IC). An efficient array of C6D6 scintillators will be used for the detection of gamma-rays. The disentanglement between fission and capture gamma-rays can be achieved by using anticoincidence events between the IC and the C6D6 detectors. Given the difference in the fission and capture cross sections, the assignment of a gamma-ray to one or the other reaction type has to be very efficient and reliable. The IC efficiency is not 100 % and a correction has to be applied to take into account the undetected fission events. To keep this correction factor low and reliable, the efficiency parameter of the IC should be high and known with a high degree of accuracy. The IC efficiency towards fission can be defined as a ratio between the number of detected neutrons in coincidence or not with fission fragments. It is therefore a value directly extractable from the experimental data. Results from test experiments of the IC will be presented and discussed, along with IC MCNPX simulations., JRC.D.4-Standards for Nuclear Safety, Security and Safeguards

Published
2014
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22. Energy sharing in the deexcitation of the90Ru compound nucleus via thepαchannel

Author

G. Barreau, A. Principe, A. Brondi, M. M. Aléonard, J. N. Scheurer, M. Harston, J.P. Goudour, D. Cabaussel, D. Curien, D. Boivin, M. Aiche, F. Bourgine, R. Moro, G. La Rana, J.F. Chemin, Emanuele Vardaci, and T.P. Doan

Subjects
Physics, Nuclear and High Energy Physics, Angular momentum, Spectrometer, Available energy, Evaporation, Alpha particle, Atomic physics, Charged particle, Energy (signal processing), Excitation
Abstract

Using the 4$\ensuremath{\pi}$ light charged-particle detector DIAMANT in combination with the $\ensuremath{\gamma}$-ray spectrometer EUROGAM II, the decay of the ${}^{90}$Ru compound nucleus via the $p\ensuremath{\alpha}$ channel was studied. These nuclei were produced at an excitation energy of 54.9 MeV and with a maximum angular momentum of 37$\ensuremath{\Elzxh}$ by the 120 MeV ${}^{32}$S + ${}^{58}$Ni reaction. The measurement of the energy of the two particles allowed the determination of the energy distribution of the entry states. A particular behavior of the sharing of the available energy between the two particles was found: For increasing values of the entry-state energy, the mean energy for protons remains almost constant while for alpha particles it decreases. This behavior is well reproduced by the evaporation code LILITA_N95. The physics underlying the decay is discussed in the framework of the statistical model which predicts a strong correlation between the excitation energy and the angular momentum of the evaporation residue. This result encourages the use of the $p\ensuremath{\alpha}$ channel to select the excitation energy and the angular momentum of the evaporation residue for superdeformed band studies.

Published
1997
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23. Insights on the population of the superdeformed bands using the EUROGAMII – DIAMANT apparatus

Author

G. LA RANA, A. BRONDI, R. MORO, E. VARDACI, M. AICHE, M. M. ALÉONARD, G. BARREAU, D. BOIVIN, F. BOURGINE, J. F. CHEMIN, J. N. SCHEURER, D. CURIEN, G. DUCHENE, F. A. BECK, B. HAAS, J. P. VIVIEN, G. DE FRANCE, F. HANNACHI, K Yoshida, S Kubono, I Tanihata, C Signorini, LA RANA, Giovanni, Brondi, Augusto, Moro, RENATA EMILIA MARIA, Vardaci, Emanuele, M., Aiche, M. M., Aléonard, G., Barreau, D., Boivin, F., Bourgine, J. F., Chemin, J. N., Scheurer, D., Curien, G., Duchene, F. A., Beck, B., Haa, J. P., Vivien, G., DE FRANCE, and F., Hannachi

Subjects
Nuclear physics, Physics, Particle physics, education.field_of_study, superdeformed band, Population, EUROGAM, education, ancillary detector, DIAMANT
Abstract

Experiments to study the decay of hot composite nuclei have been carried out with EUROGAM II γ-ray spectrometer, coupled to the DIAMANT charged-particle detector, at the VIVITRON accelerator at IReS in Strasbourg. Some relevant aspects related to the population of superdeformed bands have been addressed, on the basis of very exclusive data. We present the results for the composite nuclei 90Ru and 160Er produced in the reactions 120, 130 MeV 32S + 58Ni, and 191 MeV 37Cl + 123Sb, at excitation energies Ex≅ 55, 61 and 92 MeV, respectively Evidence is given of effects related to the angular momentum as well as to the location of the entry region.

Published
2003

24. Correction method for Doppler broadened $\gamma$-ray lines using the linear momentum of the evaporated charged particles in heavy-ion induced fusion-evaporation reactions

Author

Emanuele Vardaci, G. Barreau, J. N. Scheurer, M. Harston, A. Brondi, G. La Rana, D. Cabaussel, F. Hannachi, R. Moro, F. Bourgine, M. M. Aléonard, J.F. Chemin, D. Boivin, M. Aiche, D. Curien, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), EUROBALL, M., Aiche, M. M., Alonard, G., Barreau, D., Boivin, F., Bourgine, D., Cabaussel, J. F., Chemin, M., Harston, J. N., Scheurer, LA RANA, Giovanni, Moro, RENATA EMILIA MARIA, Brondi, Augusto, Vardaci, Emanuele, and D. CURIEN, F. HANNACHI

Subjects
Nuclear and High Energy Physics, Light charged particle, Fusion–evaporation, Astrophysics::High Energy Astrophysical Phenomena, EUROBALL SPECTROMETER, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, SUPERDEFORMED BAND, Coincidence, DIAMANT, symbols.namesake, GAMMASPHERE, 0103 physical sciences, Doppler shift, Nuclear Experiment, 010306 general physics, COMPOUND NUCLEUS, GAMMA SPECTROSCOPY, Instrumentation, DETECTOR, Physics, Fusion, Spectrometer, 010308 nuclear & particles physics, Detector, Evaporation (deposition), Charged particle, EUROGAM II, symbols, Granularity, Atomic physics, Doppler effect
Abstract

A method based on the conservation of linear momentum is used to correct the position and the width of the γ-ray lines of the residual nucleus produced in heavy-ion induced fusion–evaporation reactions. This method implies the measurement of the total number of the emitted particles, their masses, energies and directions of emission in coincidence with the prompt γ-rays. It has been applied to the 120 MeV 32 S + 58 Ni reaction whose data have been collected using the high efficiency and large granularity 4π light charged particle detector DIAMANT, coupled to the 4π γ-ray spectrometer EUROGAM II.

Published
2003
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25. Isotopic yield distributions of transfer- and fusion-induced fission from238U+12C reactions in inverse kinematics

Author

O. Delaune, A. Shrivastava, L. Gaudefroy, Beatriz Jurado, C.O. Bacri, X. Derkx, A. Chbihi, M. Caamaño, C. Schmitt, B. Fernández-Domínguez, F. Farget, A. Lemasson, Enrique Casarejos, G. Barreau, J. Benlliure, C. Golabek, T. Roger, A. Navin, M. Rejmund, Karl-Heinz Schmidt, and L. Audouin

Subjects
Physics, Nuclear and High Energy Physics, Cluster decay, Isotope, 010308 nuclear & particles physics, Fission, Nuclear Theory, Actinide, 01 natural sciences, Nuclear physics, Excited state, Yield (chemistry), 0103 physical sciences, Nuclear fusion, Atomic number, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

A method to access the complete identification in atomic number $Z$ and mass $A$ of fragments produced in low-energy fission of actinides is presented. This method, based on the use of multinucleon transfer and fusion reactions in inverse kinematics, is applied in this work to reactions between a ${}^{238}$U beam and a ${}^{12}$C target to produce and induce fission of moderately excited actinides. The fission fragments are detected and fully identified with the VAMOS spectrometer of GANIL, allowing the measurement of fragment yields of several hundreds of isotopes in a range between $A\ensuremath{\sim}80$ and $\ensuremath{\sim}160$, and from $Z\ensuremath{\sim}30$ to $\ensuremath{\sim}64$. Complete isotopic yield distributions of fragments from well defined fissioning systems are made available. Together with the precise measurement of the fragment emission angles and velocities, this technique gives further insight into the nuclear-fission process.

Published
2013
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26. Harmlessness of 1 mg cefuroxime intracameral injection at the end of cataract surgery

Author

L Bourmault, P.-Y. Robert, L Dost, G Barreau, and Jp Adenis

Subjects
medicine.medical_specialty, genetic structures, business.industry, medicine.medical_treatment, General Medicine, Cataract surgery, eye diseases, Surgery, Clinical Practice, Ophthalmology, Phakoemulsification, Posterior capsular rupture, Posterior capsule, medicine, Cefuroxime Injection, High doses, sense organs, business, Cefuroxime, medicine.drug
Abstract

Purpose Intracameral 1mg cefuroxime injection at the end of cataract surgery is included in the good practice in France and a lot of countries. Few studies have shown a macular toxicity for high doses of cefuroxime in particular in a case of dilution error for exemple. Methods We propose a study on 18, of simple cataract operated, eyes : by phakoemulsification, the same surgeon, without particular surgical complications, and no posterior capsule rupture. Only patients with medium cataract and a normal macula were included in the study. A time-domain macular OCT was pre-operatively made, and then at 7 and 30 post-operative days. The principal criterion of judgement was the central macular thickness at 30 post-operative days. Results The average pre-operative central macular thickness was 209,11 +/- 29,44 microns (143-279), at 7 post-operative days the average was 214,44 +/- 28,42 microns (145-267), and at 30 post-operative days was 219,44 +/- 27,41 microns (145-253). The differences observed between the pre and post-operative values were not significant. Conclusion These results show that at a dose of 1 mg, as an intracameral injection, and without posterior capsular rupture, cefuroxime does not significativly increase the central macular thickness. A study with a larger pool of patients would certainly confirm what the actual clinical practice lets us foresee.

Published
2013
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27. Complete isotopic distributions of fragments produced in transfer- and fusion-induced reactions

Author

Enrique Casarejos, O. Kamalou, J. C. Thomas, O. Delaune, M. G. Saint-Laurent, L. Perrot, C. Schmitt, B. Jurado, C.O. Bacri, A. Navin, Wolfgang Mittig, A. M. Amthor, C. Golabek, F. Farget, A. Lemasson, M. Rejmund, H. Savajols, G. Barreau, Oleg B. Tarasov, C. Stodel, L. Caceres, X. Derkx, J. Pereira, M. Caamano, L. Gaudefroy, J. Benlliure, David J. Morrissey, Karl-Heinz Schmidt, B. Bastin, Antonio Villari, Dominique Bazin, L. Audouin, S. Grévy, B. M. Sherrill, S. M. Lukyanov, B. Blank, T. Roger, B. Fernández-Domínguez, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), PANTECHNIK S.A., Pantechnik, F. Farget, A. Chatillon, H. Faust, G. Fioni, D. Goutte, H. Goutte, Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Universidade de Santiago de Compostela [Spain] (USC ), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Aval du cycle et Energie Nucléaire (ACEN), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Noyaux exotiques (NEX), USC, Universidad de Santiago de Compostela, Universidad Santiago de Compostela, Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Fusion, Spectrometer, 010308 nuclear & particles physics, Fission, QC1-999, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Neutron, Atomic physics, 010306 general physics, Nuclear Experiment
Abstract

Expérience GANIL/VAMOS/LISE; International audience; Two fission experiments have been performed at GANIL using 238U beams at different energies and light targets. Different fissioning systems were produced with centre of mass energies from 10 to 240MeV and their decay by fission was investigated with GANIL spectrometers. Fission-fragment isotopic distributions have been obtained. The evolution with impinging energy of their properties, the neutron excess and the width of the neutron-number distributions, gives important insights into the dynamics of the fusionfission mechanism.

Published
2013
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29. The Neutrons For Science facility at SPIRAL-2

Author

Julien Taieb, T. Materna, A. Chatillon, I. Thfoin, L. Perrot, Stanislav Simakov, T. Caillaud, X. Ledoux, Eric Bauge, A. Takibayev, Eva Simeckova, Andreas Oberstedt, Cecilia Gustavsson, B. Jacquot, Jan Novák, Danas Ridikas, A. G. Smith, G. Rudolf, B. Ban-d'Etat, Marilena Avrigeanu, D. Dore, V. Blideanu, J.M. Ramillon, C. Borcea, A. Klix, F. Gunsing, L. Giot, F. Farget, G. Bélier, I. Tsekhanovich, Diego Tarrio, J. C. Sublet, S. Czajkowski, Stephan Pomp, Olivier Serot, Beatriz Jurado, S. Bouffard, Muriel Fallot, G. Ban, O. Landoas, P. Dessagne, Stephan Oberstedt, J. Mrazek, François-René Lecolley, S. Guillous, Mitja Majerle, C. Varignon, S. Panebianco, Emmanuel Balanzat, Vlad Avrigeanu, M. Kerveno, Kaj Jansson, J.L. Lecouey, L. Audouin, B. Rossé, L. Tassan-Got, M. Aïche, T. Granier, G. Barreau, F. Negoita, Ulrich Fischer, Nathalie Marie, Pavel Bem, A. J. M. Plompen, DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique corpusculaire de Caen (LPCC), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, High intensity, Nuclear Theory, Nuclear data, Astrophysics::Cosmology and Extragalactic Astrophysics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Ion, Nuclear physics, Component (UML), Physics::Accelerator Physics, Neutron, Spiral (railway), Nuclear Experiment, Astrophysics::Galaxy Astrophysics
Abstract

The Neutrons For Science (NFS) facility is a component of SPIRAL-2 laboratory under construction at Caen (France). SPIRAL-2 is dedicated to the production of high intensity Radioactive Ions Beams (RIB). It is based on a high-power linear accelerator (LINAG) to accelerate deuterons beams in order to produce neutrons by breakup reactions on a C converter. These neutrons will induce fission in 238U for production of radioactive isotopes. Additionally to the RIB production, the proton and deuteron beams delivered by the accelerator will be used in the NFS facility. NFS is composed of a pulsed neutron beam and irradiation stations for cross-section measurements and material studies. The beams delivered by the LINAG will allow producing intense neutron beams in the 100 keV-40 MeV energy range with either a continuous or quasi-mono-energetic spectrum. At NFS available average fluxes will be up to 2 orders of magnitude higher than those of other existing time-of-flight facilities in the 1 MeV - 40 MeV range. NFS will be a very powerful tool for fundamental physics and application related research in support of the transmutation of nuclear waste, design of future fission and fusion reactors, nuclear medicine or test and development of new detectors. The facility and its characteristics are described, and several examples of the first potential experiments are presented., JRC.D.4-Standards for Nuclear Safety, Security and Safeguards

Published
2013
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31. [Natural history of eyelid melanoma]

Author

G, Barreau, M, Delage-Corre, F, Projetti, P-Y, Robert, and J-P, Adenis

Subjects
Aged, 80 and over, Disease Progression, Humans, Female, Interdisciplinary Communication, Neoplasm Invasiveness, Eyelid Neoplasms, Melanoma, Orbit, Tumor Burden
Published
2012

32. Intracameral cefuroxime injection at the end of cataract surgery reduces the incidence of endophthalmitis, a French study

Author

Jp Adenis, P.-Y. Robert, B Marin, G Barreau, and M. Mounier

Subjects
medicine.medical_specialty, business.industry, Incidence (epidemiology), medicine.medical_treatment, General Medicine, Cataract surgery, medicine.disease, Surgery, Ophthalmology, Endophthalmitis, Capsular ring, Iris retractors, Cefuroxime Injection, Postoperative infection, Medicine, business, Cefuroxime, medicine.drug
Abstract

Purpose To show the interest of intra-camerular injection of cefuroxime at the end of cataract surgery to decrease the incidence of post-operative endophthalmitis. Methods 5115 patients operated from cataract between april 2003 and june 2008 were prospectively and exhaustively included in a survey for operative site infection. Intracameral Cefuroxime injection started in june 2006, so 2289 patient received Cefuroxime, and 2826 did not. Pre-operative data (betalactamin allergy, history of endophthalmitis, age, sex) and intraoperative data (use of trypan blue, capsular ring or iris retractors, surgical time, senior or junior surgeon, corticosteroids injection, iris retractors), and postoperative infections at 8 days and 1 month were prospectively collected. Results Respectively, the incidence of endophthalmitis without and with cefuroxime intracamerular injection was 35 of 2826 patients (1,238 %) and 1 of 2289 patients (0,044 %) (p < 0,0001). None of intraoperative factors we considered has been significantly associated to postoperative infection. No allergic reaction has been reported. Conclusion Intracamerular Cefuroxime injection at the end of cataract surgery is a safe procedure to significatively decrease the incidence of endophthalmitis.

Published
2012
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33. High-spin structures of fiveN=82isotopes:54136Xe,55137Cs,56138Ba,57139La, and58140Ce

Author

M. Rousseau, Ts. Venkova, M. Houry, O. Stezowski, Ch. Theisen, A. Astier, R. Lucas, Marie-Geneviève Porquet, D. Curien, B. J. P. Gall, O. Dorvaux, D. Verney, G. Duchêne, I. Deloncle, F. Azaiez, G. Barreau, and N. Redon

Subjects
Physics, Nuclear and High Energy Physics, Proton, Isotope, 010308 nuclear & particles physics, Yrast, 01 natural sciences, Excited state, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Spin (physics), Energy (signal processing), Excitation
Abstract

Five $N=82$ isotones have been produced in two fusion-fission reactions and their $\ensuremath{\gamma}$ rays studied with the Euroball array. The high-spin states of ${}^{139}$La have been identified, while the high-spin yrast and near-to-yrast structures of the four others have been greatly extended. From angular correlation analysis, spin values have been assigned to some states of ${}^{136}$Xe and ${}^{137}$Cs. Several cascades involving $\ensuremath{\gamma}$ rays of ${}^{139}$La have been found to be delayed; they deexcite an isomeric state with ${T}_{1/2}=315(35)$ ns located at 1800 keV excitation energy. The excited states of these five $N=82$ isotones are expected to be due to various proton excitations involving the three high-$j$ subshells located above the $Z=50$ shell closure. This is confirmed by the results of shell-model calculations performed in this work. In addition, high-spin states corresponding to the excitation of the neutron core have been unambiguously identified in ${}^{136}$Xe, ${}^{137}$Cs, and ${}^{138}$Ba.

Published
2012
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34. Isotopic fission fragment distributions as a deep probe to fusion-fission dynamics

Author

B. Jurado, M. Rejmund, Antonio Villari, B. M. Sherill, K.-H. Schmidt, Oleg B. Tarasov, B. Blank, A. M. Amthor, J. Pereira, B. Fernández-Domínguez, F. Farget, H. Savajols, A. Lemasson, S. Grévy, G. Barreau, S. M. Lukyanov, D. Bazin, A. Navin, J. Benlliure, L. Audouin, M. G. Saint-Laurent, C. Schmitt, T. Roger, L. Caceres, X. Derkx, Wolfgang Mittig, B. Bastin, O. Delaune, M. Caamaño, C.O. Bacri, E. Casarejos, L. Gaudefroy, C. Stodel, L. Perrot, C. Golabek, J. C. Thomas, O. Kamalou, A. Chibihi, J. Taieb, David J. Morrissey, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Aval du cycle et Energie Nucléaire (ACEN), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Noyaux exotiques (NEX), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
History, Fission, Nuclear Theory, Shell (structure), Coulomb barrier, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Molecular physics, Education, 0103 physical sciences, medicine, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, Fusion, Range (particle radiation), 010308 nuclear & particles physics, Potential energy, Computer Science Applications, medicine.anatomical_structure, Nucleus, Excitation
Abstract

During the fission process, the nucleus deforms and elongates up to the two fragments inception and their final separation at scission deformation. The evolution of the nucleus energy with deformation is determined by the macroscopic properties of the nucleus, and is also strongly influenced by the single-particle structure of the nucleus. The fission fragment distribution is a direct consequence of the deformation path the nucleus has encountered, and therefore is the most genuine experimental observation of the potential energy landscape of the deforming nucleus. Very asymmetric fusion-fission reactions at energy close to the Coulomb barrier, produce well-defined conditions of the compound nucleus formation, where processes such as quasi-fission, pre-equilibrium emission and incomplete fusion are negligible. In the same time, the excitation energy is sufficient to reduce significantly structural effects, and mostly the macroscopic part of the potential is responsible for the formation of the fission fragments. We use inverse kinematics combined with spectrometers to select and identify the fission fragments produced in $^{238}$U+$^{12}$C at a bombarding energy close to and well-above the Coulomb barrier. For the first time, the isotopic yields are measured over the complete atomic-number distribution, between Z=30 and Z=63. The experimental set-up also allows to identify transfer-induced reactions, which lead to low-energy fission where the nuclear shell structure shows a strong influence on the fission-fragment distributions. The resulting set of data gives the possibility to observe the fission fragment properties over a wide range of excitation energy, and they reveal the vanishing of the shell effects in the potential energy of the fissioning nucleus, as well as the influence of fission dynamics., Comment: Invited Plenary Talk given at the 11th International Conference on Nucleus-Nucleus Collisions (NN2012), San Antonio, Texas, USA, May 27-June 1, 2012. To appear in the NN2012 Proceedings in Journal of Physics: Conference Series (JPCS)

Published
2012
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35. High-spin states with seniorityv=4, 5, and 6 in119–126Sn

Author

M. Houry, Ch. Theisen, O. Dorvaux, G. Duchêne, O. Stezowski, A. Astier, N. Redon, D. Curien, G. Barreau, Marie-Geneviève Porquet, B. J. P. Gall, D. Verney, I. Deloncle, M. Rousseau, R. Lucas, and F. Azaiez

Subjects
Physics, Nuclear and High Energy Physics, Angular momentum, Spin states, 010308 nuclear & particles physics, Fission, Nuclear Theory, SHELL model, 01 natural sciences, Ion, Nuclear physics, 0103 physical sciences, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Energy (signal processing), Excitation
Abstract

The ${}^{119--126}$Sn nuclei have been produced as fission fragments in two reactions induced by heavy ions: ${}^{12}\text{C}+{}^{238}\text{U}$ at a bombarding energy of 90 MeV and ${}^{18}\text{O}+{}^{208}\text{Pb}$ at 85 MeV. Their level schemes have been built from $\ensuremath{\gamma}$ rays detected using the Euroball array. High-spin states located above the long-lived isomeric states of the even- and odd-$A$ ${}^{120--126}$Sn nuclei have been identified. Moreover, isomeric states lying around 4.5 MeV have been established in ${}^{120,122,124,126}$Sn from the delayed coincidences between the fission fragment detector SAPhIR and the Euroball array. The states located above 3 MeV excitation energy are ascribed to several broken pairs of neutrons occupying the $\ensuremath{\nu}{h}_{11/2}$ orbit. The maximum value of angular momentum available in such a high-$j$ shell, i.e., for midoccupation and the breaking of the three neutron pairs, has been identified. This process is observed for the first time in spherical nuclei.

Published
2012
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36. Study of the surrogate-reaction method applied to neutron-induced capture cross sections

Author

I. Companis, P. Morel, X. Derkx, C. Theroine, S. Czajkowski, G. Boutoux, J. M. Daugas, I Matea, V. Méot, N. Capellan, L. Tassan-Got, J.T. Burke, O. Roig, A. Bail, Olivier Serot, T. Faul, K.-H. Schmidt, N. Pillet, M. Aïche, Beatriz Jurado, L. Mathieu, G. Barreau, Aval du cycle et Energie Nucléaire (ACEN), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Service de Physique des Réacteurs et du Cycle (SPRC), Département Etude des Réacteurs (DER), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Angular-momentum distribution, 010308 nuclear & particles physics, Neutron emission, Astrophysics::High Energy Astrophysical Phenomena, chemistry.chemical_element, Germanium, Neutron-induced capture cross section, Scintillator, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Residual, 01 natural sciences, Gamma-decay probability, chemistry, Excited state, Surrogate-reaction method, 0103 physical sciences, Neutron, Atomic physics, Experimental methods, 010306 general physics, Nuclear Experiment, Spin-½
Abstract

Gamma-decay probabilities of 173Yb and 176Lu have been measured using the surrogate reactions 174Yb(3He,αγ)173Yb* and 174Yb(3He,pγ)176Lu*, respectively. For the first time, the gamma-decay probabilities have been obtained with two independent experimental methods based on the use of C6D6 scintillators and Germanium detectors. Our results for the radiative-capture cross sections are several times higher than the corresponding neutron-induced data. To explain these differences, we have used our gamma-decay probabilities to extract rather direct information on the spin distributions populated in the transfer reactions used. They are about two times wider and the mean values are 3 to 4 ℏ higher than the ones populated in the neutron-induced reactions. As a consequence, in the transfer reactions neutron emission to the ground and first excited states of the residual nucleus is strongly suppressed and gamma-decay is considerably enhanced.

Published
2012
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37. 243Am neutron-induced fission cross section in the fast neutron energy range

Author

Stephan Oberstedt, A. Bidaud, B. Jurado, David K. Shuh, I. AlMahamid, D. Dassié, F.-J. Hambsch, J. N. Wilson, J. Floyd, S. Czajkowski, Grégoire Kessedjian, Wayne W. Lukens, L. Tassan-Got, M. Aiche, G. Barreau, B. Haas, L. Mathieu, Aval du cycle et Energie Nucléaire (ACEN), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Elastic scattering, Physics, Nuclear and High Energy Physics, Proton, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Fission, Nuclear Theory, Order (ring theory), 7. Clean energy, 01 natural sciences, Neutron temperature, Nuclear physics, Cross section (physics), 0103 physical sciences, Neutron, Sensitivity (control systems), Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

The existing evaluations of the ${}^{243}$Am neutron-induced fission cross section have been questioned by recent measurements performed at the GNEISS facility. In the neutron energy range from 1 to 6 MeV, the GNEISS data present deviations of more than 15$%$ with respect to the evaluations. In order to solve this problem, we have measured this cross section in reference to three different standard cross sections. The first standard reaction used corresponds to the neutron on proton elastic scattering cross section, which is known with a precision better than 0.5$%$ over a wide neutron-energy range of 1 meV to 20 MeV. The other two experiments were conducted in reference to the ${}^{235}$U(n, f) and ${}^{238}$U(n, f) reactions. The comparison between these three standard reactions ensures that systematic parameters have been correctly evaluated. Moreover, a sensitivity analysis of parameters and correlations of parameters is described and a complete variance-covariance matrix of the measurements is presented and discussed.

Published
2012
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38. Evolution of isotopic fission-fragment yields with excitation energy

Author

M. Rejmund, L. Audouin, B. M. Sherrill, J. C. Thomas, Enrique Casarejos, G. Barreau, Oleg B. Tarasov, M. Caamano, A. M. Amthor, J. Taieb, C.O. Bacri, C. Golabek, H. Savajols, Wolfgang Mittig, C. Schmitt, B. Bastin, David J. Morrissey, X. Derkx, B. Jurado, A. Navin, Antonio Villari, C. Stodel, L. Caceres, L. Perrot, J. Benlliure, F. Farget, A. Lemasson, O. Delaune, O. Kamalou, D. Bazin, T. Roger, B. Fernández-Domínguez, S. Grévy, K.-H. Schmidt, B. Blank, L. Gaudefroy, S. M. Lukyanov, M. G. Saint-Laurent, J. Pereira, J.D Frankland, A. Pagano, S. Pirrone, M.-F Rivet, F. Rizzo, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), PANTECHNIK S.A., Pantechnik, Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear reaction, Physics, Isotopes of uranium, Isotope, 010308 nuclear & particles physics, Fission, QC1-999, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Particle detector, Nuclear physics, Uranium-238, Chemical physics, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Neutron, 010306 general physics, Nuclear Experiment, Excitation
Abstract

Expérience GANIL/VAMOS-LISE; International audience; Two fission experiments have been performed at GANIL using 238U beams at different energies and light targets. Different fissioning systems were produced with excitation energies from 10 to 230 MeV and their decay by fission was investigated with GANIL spectrometers. Preliminary fission-fragment isotopic distributions have been obtained. The evolution with impinging energy of their properties, the neutron excess and the width of the neutron-number distributions, gives important insights into the dynamics of fusion-fission mechanism.

Published
2012
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39. Characterization of metal surfaces irradiated by a long‐pulse KrF excimer laser

Author

G. Barreau, J. E. Montagne, Th. Sarnet, L. Barrallier, G. Inglesakis, and M. Autric

Subjects
Materials science, Excimer laser, Scanning electron microscope, medicine.medical_treatment, Alloy, Metallurgy, Biomedical Engineering, Titanium alloy, engineering.material, Laser, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, law.invention, Residual stress, law, engineering, medicine, Irradiation, Composite material, Instrumentation, Power density
Abstract

Metallic samples were irradiated by a long‐pulse (τ > 300 ns) KrF laser. The experiments were performed with an energy density of 0.3–120 J cm−2 and a power density of 1–400 MW cm−2. The samples investigated were pure aluminum, aluminum alloy, low‐alloy constructional steel and titanium alloy. They were polished to obtain a roughness of 10 < Ra < 0.08 μm and stress‐relief heat‐treated for some residual stress measurements. The characterization of the irradiated metal surfaces was performed using scanning electron microscopy (SEM), roughness analyzers, a microhardness tester and X‐ray diffraction (XRD) residual stress apparatus. The improvement or deterioration in the mechanical properties of the metallic samples and some potential applications are discussed.

Published
1994
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40. Feeding of ND and SD bands in Dy-151,Dy-152 nuclei

Author

J. N. Scheurer, M. Aiche, M. M. Aleonard, G. Barreau, D. Boivin, F. Bourgine, J. F. Chemin, T. P. Dean, BRONDI, AUGUSTO, LA RANA, GIOVANNI, MORO, RENATA EMILIA MARIA, A. Principe, VARDACI, EMANUELE, D. Curien, G. Duchene, G. de France, F. A. Beck, B. Haas, J. P. Vivien, F. Hannachi, J. N., Scheurer, M., Aiche, M. M., Aleonard, G., Barreau, D., Boivin, F., Bourgine, J. F., Chemin, T. P., Dean, Brondi, Augusto, LA RANA, Giovanni, Moro, RENATA EMILIA MARIA, A., Principe, Vardaci, Emanuele, D., Curien, G., Duchene, G., de France, F. A., Beck, B., Haa, J. P., Vivien, and F., Hannachi

Subjects
SUPERDEFORMED BANDS, IPERDEFORMED BANDS, ALPHA-GAMMA COINCIDENCES
Abstract

alpha -energy distributions, associated with ND and SD states in Dy-151,Dy-152, have been obtained from the reaction Cl-37+Sb-123 at 191 MeV. Contrarily to the case of Dy-152, they are very different from each other in the case of Dy-151. A description in terms of energy localization of entry states is given.

Published
2000

41. Neutron-induced cross sections of short-lived nuclei via the surrogate reaction method

Author

G. Barreau, Julien Taieb, L. Mathieu, E. Bauge, L. Gaudefroy, O. Roig, O. Sérot, I. Companis, Jason Burke, C. Theroine, I Matea, S. Czajkowski, G. Boutoux, V. Méot, N. Capellan, X. Derkx, N. Pillet, M. Aïche, L. Tassan-Got, Beatriz Jurado, F. Gunsing, P. Romain, P. Morel, J.M. Daugas, T. Faul, Aval du cycle et Energie Nucléaire (ACEN), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Etudes de PHysique (LEPH), Service de Physique des Réacteurs et du Cycle (SPRC), Département Etude des Réacteurs (DER), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Département Etude des Réacteurs (DER), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Nuclear reaction, Fission, 020209 energy, QC1-999, Nuclear Theory, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, 010305 fluids & plasmas, Nuclear physics, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, medicine, Neutron, 010306 general physics, Nuclear Experiment, Isotope, Chemistry, Stable isotope ratio, 010308 nuclear & particles physics, Physics, Actinide, medicine.anatomical_structure, Nucleus, Excitation
Abstract

The conference proceedings will be published (on-line) at the EPJ Web of Conferences.; Neutron-induced capture cross sections of short-lived nuclei are of great importance in many areas: fundamental nuclear physics, nuclear astrophysics and nuclear applications, such as nuclear reactors. However, very often the high radioactivity of the samples makes the direct measurement of these cross sections extremely difficult. The surrogate reaction method [1] is an indirect way of determining neutron-induced cross sections for reactions that proceed through a compound nucleus. In this method, the decaying nucleus of the desired reaction is produced via a transfer or an inelastic scattering reaction (figure 1). This technique presents the advantage that the target material can be stable or less radioactive than the material required for a neutron-induced measurement. Nevertheless, a significant question in the use of the surrogate reaction method lies in the difference between the spin and parity population in the neutron-induced and surrogate reactions. The CENBG collaboration has successfully applied this technique to determine the neutron-induced fission cross sections of several short-lived nuclei such as 233Pa[2], 242;243Cm and 241Am[3]. The results are in very good agreement with neutron-induced data. We are currently investigating whether this powerful technique can also be used to determine radiative capture cross sections. For this purpose, we have studied the transfer reactions 174Yb(3He,pg)176Lu and 174Yb(3He,4Heg)173Yb as surrogates for the 175Lu(n,g) and 172Yb(n,g) reactions, respectively. The g probabilities obtained in our experiment show clear discrepancies with already existing neutroninduced data. In this contribution we will present the experimental set-up and the data analysis. Then, we will focus on the origin of these discrepencies. Perspectives for the surrogate method applied to capture cross sections will be discussed.

Published
2011
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42. The electronion scattering experiment ELISe at the International Facility for Antiproton and Ion Research (FAIR) - A conceptual design study

Author

E. Garrido, Igor Meshkov, E. Khan, Pedro Sarriguren, B. Franzke, A. Chatillon, Marielle Chartier, M. Aiche, D. Doré, B. Jurado, Dirk Rudolph, I.A. Koop, S. N. Ershov, M. Fujiwara, Mikhail V. Zhukov, Roy Crawford Lemmon, R. Johnson, S. A. Krupko, D. N. Kadrev, S. Karataglidis, Yurii M. Shatunov, G. Belier, Thomas Nilsson, Oliver Kester, C. Schmitt, C. Fernandez Ramirez, E. Moya de Guerra, Norbert Pietralla, S. Czajkowski, F. Nolden, M. K. Gaidarov, Thomas Rauscher, G. P. A. Berg, E. Berthoumieux, Harald Merkel, D. Ridikas, I. Seleznev, Achim Richter, Andreas Zilges, F. Farget, A. Kelic-Heil, J. A. Caballero, L. V. Chulkov, Tatuya Adachi, V. Lisin, Helmut Weick, H. Lenske, Håkan T Johansson, Kai Hencken, Anton Nikolaev Antonov, K.-H. Schmidt, B. Krusche, A.A. Korsheninnikov, A. M. Rodin, Björn Jonson, Y. Litvinov, A.V. Otboev, P. Beller, Nasser Kalantar-Nayestanaki, U. Müller, Ch. Scheidenberger, L. V. Grigorenko, A. Dolinskii, N. Kurz, D. G. Jenkins, Laurent Tassan-Got, Pavel Golubev, N. V. Rudnev, Thomas Aumann, Andreas Martin Heinz, Seigo Kato, J. Taieb, A.N. Skrinsky, R. Alvarez Rodriguez, W. N. Catford, M. J. G. Borge, A. A. Ogloblin, J. Jourdan, A. V. Gorshkov, G. Münzenberg, Elena Litvinova, A. Letourneau, Takeshi Suda, A. Artukh, B. V. Danilin, G. Schrieder, A.N. Vorontsov, G. M. Ter-Akopian, P.V. Logatchov, D.I. Shvartz, S. Hamieh, K. Boretzky, Sergei Kamerdzhiev, A. N. Mushkarenkov, C. J. Barton, Peter Egelhof, Jim Al-Khalili, H. Emling, Paul Stevenson, Carlos A. Bertulani, Arnd R. Junghans, D. M. Cullen, E. Dupont, Dirk Trautmann, Joachim Enders, M. Steck, J. Udias-Moinelo, L.M. Fraile Prieto, M. O. Distler, Vasilii V. Parkhomchuk, Mohsen Harakeh, Göran Hugo Nyman, M. V. Ivanov, Vladimir Avdeichikov, Stefano Panebianco, Y. Sereda, J.E. Amaro Soriano, S.V. Shiyankov, D. Kiselev, A. S. Fomichev, E. Syresin, Hans Geissel, V. Volkov, L. Audouin, E. A. Kuzmin, Y. Teterev, S. Klygin, A. Polonski, A. A. Turinge, S. I. Sidorchuk, T. Granier, H. J. Wörtche, V. G. Nedorezov, P.Y. Shatunov, J. R. Vignote, J. Lopez Herraiz, A.M. Lallena Rojo, D.N. Shatilov, Haik Simon, Y. Grishkin, G. Barreau, S. V. Stepantsov, M. S. Golovkov, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), KVI - Center for Advanced Radiation Technology, Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Nuclear and High Energy Physics, electronscattering, FORM-FACTORS, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Electron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], DATA-ACQUISITION SYSTEM, NUCLEAR-STRUCTURE, 01 natural sciences, BINDING-ENERGIES, CHARGE-DENSITY DISTRIBUTIONS, Ion, CROSS-SECTIONS, Nuclear physics, Nuclei far off stability, Conceptual design, eA collider, 0103 physical sciences, CENTRAL DEPRESSION, Electron scattering, 010306 general physics, Instrumentation, Physics, 010308 nuclear & particles physics, Scattering, 29.27.-a, 25.30.Bf,25.30.Dh,21.10.Ft,29.20.Dh,29.30.-h, RELATIVISTIC HEAVY-IONS, EXOTIC NUCLEI, Facility for Antiproton and Ion Research, GIANT-RESONANCES, Storage ring
Abstract

The electronion scattering experiment ELISe is part of the installations envisaged at the new experimental storage ring at the International Facility for Antiproton and Ion Research (FAIR) in Darmstadt, Germany. It offers an unique opportunity to use electrons as probe in investigations of the structure of exotic nuclei. The conceptual design and the scientific challenges of ELISe are presented. © 2011 Elsevier B.V. All rights reserved., The authors acknowledge financial support from the EC via the INTAS pro- gramme, grants No. 03-54-6545 and 05-1000008-8272. This work was partially supported by the Hessian LOEWE initiative Helmholtz International Center for FAIR

Published
2011
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43. The Neutrons for Science Facility at SPIRAL‐2

Author

X. Ledoux, M. Aïche, M. Avrigeanu, V. Avrigeanu, L. Audouin, E. Balanzat, B. Ban-d'Etat, G. Ban, G. Barreau, E. Bauge, G. Bélier, P. Bem, V. Blideanu, J. Blomgren, C. Borcea, S. Bouffard, T. Caillaud, A. Chatillon, S. Czajkowski, P. Dessagne, D. Doré, M. Fallot, F. Farget, U. Fischer, L. Giot, T. Granier, S. Guillous, F. Gunsing, C. Gustavsson, S. Herber, B. Jacquot, B. Jurado, M. Kerveno, A. Klix, O. Landoas, F. R. Lecolley, J. F. Lecolley, J. L. Lecouey, M. Majerle, N. Marie, T. Materna, J. Mrazek, F. Negoita, J. Novak, S. Oberstedt, A. Oberstedt, S. Panebianco, L. Perrot, M. Petrascu, A. J. M. Plompen, S. Pomp, J. M. Ramillon, D. Ridikas, B. Rossé, G. Rudolf, O. Serot, O. Shcherbakov, S. P. Simakov, E. Simeckova, A. G. Smith, J. C. Steckmeyer, J. C. Sublet, J. Taïeb, L. Tassan-Got, A. Takibayev, E. Tungborn, I. Thfoin, I. Tsekhanovich, C. Varignon, J. P. Wieleczko, Marianne E. Hamm, Robert W. Hamm, DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Aval du cycle et Energie Nucléaire (ACEN), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear transmutation, 010308 nuclear & particles physics, Fission, Nuclear Theory, Radioactive waste, Neutron radiation, Fusion power, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Linear particle accelerator, Nuclear physics, 0103 physical sciences, Physics::Accelerator Physics, Spallation, Neutron, 010306 general physics, Nuclear Experiment, Computer Science::Operating Systems
Abstract

International audience; The "Neutrons for Science" (NFS) facility will be a component of SPIRAL‐2, the future accelerator dedicated to the production of very intense radioactive ion beams, under construction at GANIL in Caen (France). NFS will be composed of a pulsed neutron beam for in‐flight measurements and irradiation stations for cross‐section measurements and material studies. Continuous and quasi‐monokinetic energy spectra will be available at NFS respectively produced by the interaction of deuteron beam on thick a Be converter and by the 7Li(p,n) reaction on a thin converter. The flux at NFS will be up to 2 orders of magnitude higher than those of other existing time‐of‐flight facilities in the 1 MeV to 40 MeV range. NFS will be a very powerful tool for physics and fundamental research as well as applications like the transmutation of nuclear waste, design of future fission and fusion reactors, nuclear medicine or test and development of new detectors.

Published
2011
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44. Measurement of fragment mass-energy correlations for 248Cm (s, f): far-out asymmetric fission and cold fragmentations

Author

M. Asghar, M. Hussonnois, J. Trochon, G. Barreau, P. Audouard, M.S. Moore, B. Leroux, T.P. Doan, F. Brisard, A. Benoufella, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Chambon, Pascale

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Mass energy, Cluster decay, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], 010308 nuclear & particles physics, Fission, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Amplitude, Fragmentation (mass spectrometry), Ionization, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics
Abstract

A back-to-back ionisation chamber has been used to measure the fission fragment mass-kinetic-energy correlations for 248 Cm(s, f). In all about 12 × 10 6 fission events were collected. The different distributions in the high-yield region are consistent with the existent data. As predicted by the theory of fission channels, the existence of far-out asymmetric fission has been confirmed, but its amplitude is much smaller than that for 252 Cf(s, f) indicating that the barrier of the channel corresponding to this channel should be lower for 252 Cf(s, f) than for 248 Cm(s, f). Furthermore, the 〈 E K 〉( M H ) and σ E K ( M H ) distributions show correlated fluctuations in the far-out asymmetric region suggesting the existence of at least two scission configurations with different deformations for the same fragmentation. In the cold-fission region, the deformed neutron N ⋍ 88 shell dominates the yield.

Published
1993
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45. Influence de l’origine des contraintes résiduelles sur leur relaxation thermique dans le cas d’aciers alliés

Author

J. Barralis, G. Barreau, and L. Barrallier

Subjects
Materials Chemistry, Metals and Alloys, Physical and Theoretical Chemistry, Condensed Matter Physics
Abstract

La stabilite thermique des contraintes residuelles, apres traitements superficiels, de deux aciers allies est le theme principal de ce travail. La relaxation thermique des contraintes residuelles depend de l'origine meme de ces contraintes et, par consequent, du type de traitements de surface utilises pour les generer. Deux nuances d'aciers sont etudiees: 32 CDV 13 et 35 NCD 16. Une etude thermodynamique utilisant un parametre d'equivalence temps-temperature montre que les contraintes d'usinage ou de rectification ont une cinetique de relaxation differente, d'un ordre de grandeur, par rapport a celle de nitruration.

Published
1993
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47. Neutron-induced capture cross sections via the surrogate reaction method

Author

P. Morel, L. Tassan-Got, I. Companis, S. Czajkowski, D. Dassié, C. Theroine, Julien Taieb, Beatriz Jurado, J.T. Burke, V. Méot, J. M. Daugas, E. Bauge, G. Boutoux, B. Haas, N. Pillet, G. Barreau, M. Aïche, F. Gunsing, X. Derkx, Olivier Serot, T. Faul, O. Roig, A. Bail, N. Capellan, L. Mathieu, L. Gaudefroy, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), T. Granier, B. Laurent, X. Ledoux and J.-G. Marmouget, X. Ledoux, J.-G. Marmouget, Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
Nuclear reaction, Nuclear transmutation, 010308 nuclear & particles physics, Neutron emission, Chemistry, Fission, Physics, QC1-999, Minor actinide, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Charged particle, Nuclear physics, Cross section (physics), 0103 physical sciences, Neutron, Atomic physics, 010306 general physics
Abstract

The full papers will be published in EPJ Web of Conferences.; International audience; The surrogate reaction method is an indirect way of determining cross sections for nuclear reactions that proceed through a compound nucleus. In this method, the compound nucleus is produced via an alternative (surrogate) reaction and its decay (by fission, gamma or neutron emission) is measured in coincidence with the outgoing appropriate charged particle. This technique has enabled neutron-induced cross sections to be extracted for nuclear reactions on short-lived nuclei that otherwise could not be measured. The CENBG collaboration has successfully applied this technique to determine the neutron-induced fission cross sections of several short-lived nuclei such as 233Pa, 242,243Cm and 241Am. These data are very important for the development of the Th/U cycle and for minor actinide transmutation. We currently investigate whether this powerful technique can also be used to determine the neutron-induced capture cross sections. For this purpose we will use the surrogate reaction 174Yb(3He,pγ)176Lu to infer the well known 175Lu(n,γ) cross section and compare the results with the directly measured neutron-induced data. The experimental set-up and the first results will be presented. We will also discuss our future plans to use the surrogate method for extracting actinides (n,γ) cross sections.

Published
2010
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48. Radioactive target needs for nuclear reactor physics and nuclear astrophysics

Author

Beatriz Jurado, G. Barreau, C.O. Bacri, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear reaction, Nuclear and High Energy Physics, 020209 energy, Nuclear engineering, Nuclear Theory, Radioactive targets, Nuclear data, Measure (physics), 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, law.invention, Nuclear physics, Nuclear reactor physics, Nucleosynthesis, law, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Nuclear astrophysics, Fission reactors, Element nucleosynthesis, Nuclear Experiment, Instrumentation, Alternative methods, Physics, 010308 nuclear & particles physics, Nuclear reactor
Abstract

Nuclear Instruments and Methods in Physics Research Section A - In press.; Nuclear reaction cross sections of short-lived nuclei are key inputs for new generation nuclear reactor simulations and for models describing the nucleosynthesis of elements. After discussing various topics of nuclear astrophysics and reactor physics where the demand of nuclear data on unstable nuclei is strong, we describe the general characteristics of the targets needed to measure the requested data. In some cases the half-life of the nucleus of interest is so short that it is not possible to produce a target and perform the measurement. However, some alternative methods have been developed that allow one to obtain neutron-induced cross sections of highly radioactive nuclei. One of these methods is the surrogate reaction technique. We explain the principle of the surrogate method and describe the characteristics of the targets used in surrogate experiments.

Published
2010
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49. Alpha energy distribution as a probe for the feeding of ND and SD bands in Dy-151,Dy-152 nuclei

Author

M. Aiche, M. M. Aleonard, G. Barreau, D. Boivin, F. Bourgine, J. F. Chemin, J. N. Scheurer, T. P. Doan, BRONDI, AUGUSTO, LA RANA, GIOVANNI, MORO, RENATA EMILIA MARIA, A. Principe, VARDACI, EMANUELE, D. Curien, G. Duchene, G. de France, F. A. Beck, B. Haas, J. P. Vivien, F. Hannachi, M., Aiche, M. M., Aleonard, G., Barreau, D., Boivin, F., Bourgine, J. F., Chemin, J. N., Scheurer, T. P., Doan, Brondi, Augusto, LA RANA, Giovanni, Moro, RENATA EMILIA MARIA, A., Principe, Vardaci, Emanuele, D., Curien, G., Duchene, G., de France, F. A., Beck, B., Haa, J. P., Vivien, and F., Hannachi

Subjects
COINCIDENCE, HEAVY-ION REACTIONS, SUPERDEFORMED BANDS, POPULATION
Abstract

The study of the alpha-particle energy distributions associated with ND and SD states in Dy-151,Dy-152 has been carried out. The Dy isotopes were produced in the reaction Cl-37+Sb-123 at 191 MeV via the (alpha 5n) and (alpha 4n) channels, respectively. In Dy-151 the alpha-particle energy distributions associated to ND and SD are very different from each other, both at the low and high energy sides inducing a difference of 3 MeV in the alpha-particle mean energy. In Dy-152 the situation is different; the alpha-particle spectral shapes are similar and a difference in the alpha-particle mean energy of only 0.7 MeV is deduced. A description in terms of energy localization of entry states is given.

Published
1999

50. Minor actinide fission induced by multi-nucleon transfer reaction in inverse kinematics

Author

Enrique Casarejos, B. Jurado, F. Rejmund, M. Caamano, K.-H. Schmidt, G. Barreau, T. Roger, L. Gaudefroy, A. Lemasson, B. Fernández-Domínguez, C. Schmitt, A. Navin, C. Golabek, A. Shrivastava, X. Derkx, C.O. Bacri, J. Benlliure, M. Rejmund, L. Audouin, J. Taieb, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Gesellschaft fur Schwerionenforschung, Darmstadt, Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Universidade de Santiago de Compostela [Spain] (USC ), Oliver Lodge Laboratory, University of Liverpool, DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), L. Bonneau, N. Dubray, F. Gunsing, B. Jurado, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Cold fission, 010308 nuclear & particles physics, Chemistry, Fission, Physics, QC1-999, Nuclear Theory, Radioactive waste, Minor actinide, Fission product yield, Actinide, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Fast fission, Nuclear physics, 0103 physical sciences, 010306 general physics, Long-lived fission product, Nuclear Experiment
Abstract

Expérience GANIL; International audience; In the framework of nuclear waste incineration and design of new generation nuclear reactors, experimental data on fission probabilities and on fission fragment yields of minor actinides are crucial to design prototypes. Transfer-induced fission has proven to be an efficient method to study fission probabilities of actinides which cannot be investigated with standard techniques due to their high radioactivity. We report on the preliminary results of an experiment performed at GANIL that investigates fission probabilities with multi-nucleon transfer reactions in inverse kinematics between a 238U beam on a 12C target. Actinides from U to Cm were produced with an excitation energy range from 0 to 30 MeV. In addition, inverse kinematics allowed to characterize the fission fragments in mass and charge. A key point of the analysis resides in the identification of the actinides produced in the different transfer channels. The new annular telescope SPIDER was used to tag the target-like recoil nucleus of the transfer reaction and to determine the excitation energy of the actinide. The fission probability for each transfer channel is accessible and the preliminary results for 238U are promising.

Published
2009
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