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Your search keyword '"Fioni, G."' showing total 11 results
Start Over Author "Fioni, G." Topic nuclear physics
11 results on '"Fioni, G."'

2. Preliminary results on $^{241}Am$ transmutation in a high thermal flux

Author

Bolognese, T, Fioni, G, Cribier, Michel, Marie, F, Aubert, M, Ayrault, S, Cavedon, J M, Chartier, F, Doneddu, F, Faust, H, Gaudry, A, Gunsing, F, Leconte, P, Lelièvre, F, Martino, J, Oliver, R, Pluquet, A, Spiro, Michel, and Veyssière, C

Subjects
Nuclear Physics
Published
1998

3. Actinide Fission and Capture Cross Section measurements at ILL: the Mini-INCA project.

Author

Letourneau, A., Al Mahamid, I., Blandin, Ch., Bringer, O., Chabod, S., Chartier, F., Faust, H., Fioni, G., Foucher, Y., Marie, F., Mutti, P., and Veyssiere, Ch.

Subjects
ACTINIDE elements, NUCLEAR physics, NUCLEAR fission, NUCLEAR reactions, NEUTRONS
Abstract

Fission cross section of short-lived minor actinides is of prime importance for the incineration of minor actinides in high and thermal neutron fluxes. But due to the shortness of their half-lives, measurements are difficult to handle on these isotopes and the existing data present some large discrepancies. An original method has been developed, in the framework of the Mini-INCA project at ILL, to measure the fission and capture cross sections of minor actinides with low error bars associated even for short-lived isotopes. This method lies on a quasi on-line alpha- and gamma-spectroscopy of irradiated samples and on the use of fission micro-chambers. Coupled to a very powerful Monte-Carlo simulation, both microscopic information on nuclear reactions (total and partial cross sections for neutron capture and/or fission reactions) and macroscopic information on transmutation and incineration potentials could be gathered. In this paper, the method is explained in its originality and some recent results are given and compared with existing measurements and evaluated data libraries. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2005
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4. Transmutation and Neutron Flux Studies with Fission Chambers in the MEGAPIE Target.

Author

Chabod, S., Blandin, Ch., Chartier, F., Fioni, G., Foucher, Y., Letourneau, A., Marie, F., and Toussaint, J. C.

Subjects
NEUTRONS, PARTICLES (Nuclear physics), NUCLEAR physics, TRANSMUTATION (Chemistry), TRANSMUTATION of radioactive wastes
Abstract

8 fission micro chambers will be inserted inside the central rod of the 1 MW liquid Pb-Bi MEGAPIE target in order to study the transmutation of two major actinides and to measure the neutron flux at a level of 5%. These chambers were developed for high neutron fluxes and tested at Laue Langevin Institute. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2005
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5. Thermal-Neutron-Induced Fission of 243Cm: Light-Peak Data from the Lohengrin Mass Separator.

Author

Tsekhanovich, I., Varapai, N., Rubchenya, V., Rochman, D., Simpson, G. S., Sokolov, V., Fioni, G., and Al Mahamid, Ilham

Subjects
THERMAL neutrons, NEUTRONS, NUCLEAR reactors, NUCLEAR fission, NUCLEAR reactions, COLLISIONS (Nuclear physics), NUCLEAR physics, PHYSICS
Abstract

Thermal-neutron-induced fission of 243Cm was studied at the Lohengrin mass separator. The light-mass peak of the fission-yield curve was investigated, and mass (from A=72 to A=120) and independent-product (for Z=28–37) yields were obtained. A comparison was made of the results obtained on the mass yields with those from the fission of 245Cm as well as with the data given by the JEF-2.2 and ENDF/B-VI libraries. The yield of masses in the superasymmetric region was found to be identical to other fission reactions studied at Lohengrin. Experimental fission-product yields from the fission of 243Cm and 245Cm were able to be well described within a theoretical model, which incorporates standard and superasymmetric fission modes as well as a calculation of the charge-distribution parameters in isobaric chains and neutron multiplicities from primary fragments. A prediction of the yield of Ni isotopes in the fission of 243,245,247Cm was made. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2005
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6. γ spectroscopy experiments relevant for nuclear waste transmutation.

Author

Marie, F., Cribier, M., Deruelle, O., Faust, H., Fioni, G., Leconte, Ph., Martino, J., Rottger, S., and Veyssiere, C.

Subjects
NUCLEAR physics, GAMMA ray spectrometry, TRANSMUTATION of radioactive wastes
Abstract

γ-spectroscopy is an important tool also for nuclear waste transmutation studies. An experiment has been performed at ILL Grenoble to measure [sup 241]Am and [sup 242gs]Am thermal capture cross sections that play a major role for the transmutation of [sup 241]Am in a high thermal neutron flux, coupling γ-spectroscopy with mass spectrometry methods. σ[sub c]([sup 242gs]Am), for which the three main evaluation data libraries were giving very different values, has been measured to be 280±40 barns. That confirms the low cross section value making possible the [sup 241]Am transmutation by thermal neutrons. In the MINI-INCA project, we plan to widen the measurement to other minor actinides of interest using γ and α-spectroscopy of neutron irradiated samples for thermal and epi-thermal fluxes up to 2.10[sup 15] n/s/cm[sup 2]. © 2000 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2000

7. Onset of collectivity in neutron-rich Sr and Kr isotopes: Prompt spectroscopy after Coulomb excitation at REX-ISOLDE, CERN

Author

Therese Renstrøm, P. J. Napiorkowski, M. Zielinska, P. Delahaye, J. Ljungvall, B. Bruyneel, W. Korten, Sunniva Siem, R. Lutter, C. Fransen, Emyr Clement, Andreas Görgen, Janne Pakarinen, B. Siebeck, D. G. Jenkins, B. Bastin, Andreas Ekström, I. Stefanescu, J. Srebrny, C. Bauer, J. Iwanicki, P. Reiter, N. Hasan, Conor Fitzpatrick, R. Gernhäuser, C. Sotty, M. J. Vermeulen, G. Georgiev, Andreas Wiens, Jonathan Butterworth, M. Seidlitz, N. Bree, P. A. Butler, K. Moschner, Herbert Hess, A. C. Larsen, P. Marley, K. Wrzosek-Lipska, A. Blazhev, A. Dijon, J. Van de Walle, H. De Witte, N. Warr, Gry Merete Tveten, A. Petts, 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), CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), 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)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, F. Farget, A. Chatillon, H. Faust, G. Fioni, D. Goutte, H. Goutte, Chatillon, A, Farget, F, Faust, H, Fioni, G, Goutte, D, Goutte, H, 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 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 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 Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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
Physics, Large Hadron Collider, Shape change, Isotope, 010308 nuclear & particles physics, QC1-999, Nuclear Theory, Coulomb excitation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, Neutron number, 0103 physical sciences, Quadrupole, Physics::Accelerator Physics, Neutron, Atomic physics, 010306 general physics, Spectroscopy, Nuclear Experiment, ComputingMilieux_MISCELLANEOUS
Abstract

A rapid onset of quadrupole deformation is known to occur around the neutron number 60 in the neutron-rich Zr and Sr isotopes. This shape change has made the neutron-rich A = 100 region an active area of experimental and theoretical studies for many decades now. We report in this contribution new experimental results in the neutron rich 96,98Sr investigated by safe Coulomb excitation of radioactive beams at the REX-ISOLDE facility, CERN. Reduced transition probabilities and spectroscopic quadrupole moments have been extracted from the differential Coulomb excitation cross section supporting the scenario of shape coexistence/change at N = 60. Future perspectives are presented including the recent experimental campaign performed at ILL-Grenoble. ispartof: EPJ Web of Conferences vol:62 ispartof: 5th International Workshop on Nuclear Fission and Fission Product Spectroscopy (FISSION) location:Caen: FRANCE date:28 May - 31 May 2013 status: published

Published
2013

8. Neutron-rich In and Cd isotopes close to the doubly-magic $^{132}Sn$

Author

A. Covello, A. Gargano, G. S. Simpson, J. Genevey, A. Scherillo, H. Faust, I. Tsekhanovich, R. Orlandi, J. A. Pinston, Institut Laue-Langevin (ILL), ILL, 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), Goutte H., Faust H., Fioni G., and Goutte D.

Subjects
nuclei with mass number 90 to 149, Fission, cadmium, Nuclear Theory, 02 engineering and technology, indium, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Mass spectrometry, 7. Clean energy, Nuclear physics, 0202 electrical engineering, electronic engineering, information engineering, Neutron, MAGIC (telescope), neutron-nucleus reactions, Nuclear Experiment, mass spectrometers, Range (particle radiation), Isotope, Chemistry, Radiochemistry, Nuclear shell model, 020206 networking & telecommunications, 21.10.Tg, 23.20.Lv, 25.85.Ec, 27.60.+j, Microsecond, fission of plutonium, nuclear shell model, 020201 artificial intelligence & image processing
Abstract

Microsecond isomers in the In and Cd isotopes, in the mass range A = 123 to 130, were investigated at the ILL reactor, Grenoble, using the LOHENGRIN mass spectrometer, through thermal-neutron induced fission reactions of Pu targets. The level schemes of the odd-mass $^{123-129}$In are reported. A shell-model study of the heaviest In and Cd nuclei was performed using a realistic interaction derived from the CD-Bonn nucleon-nucleon potential

Published
2005

9. Shape Coexistence In Odd And Odd-Odd Nuclei In The A∼100 Region

Author

J. A. Pinston, Gary Simpson, J. Genevey, W. Urban, 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), Institut Laue-Langevin (ILL), ILL, Goutte H., Faust H., Fioni G., and Goutte D.

Subjects
nuclei with mass number 90 to 149, 23.20.Lv, 25.85.Ca, 25.85.Ec, 21.60.Ev, Neutron emission, Fission, nuclear energy level transitions, Nuclear Theory, 02 engineering and technology, Electron, shape coexistence, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear physics, spontaneous fission, 0202 electrical engineering, electronic engineering, information engineering, neutron-nucleus reactions, Nuclear Experiment, Spectroscopy, nuclear shape, Spontaneous fission, Physics, Cluster decay, deformed nuclei, 020206 networking & telecommunications, Parity (physics), Neutron temperature, exotic nuclei, fission of plutonium, 020201 artificial intelligence & image processing, Atomic physics
Abstract

In the even-even nuclei around A=100 a transition from spherical to deformed shapes occurs from N=58 to N=60. The isotones with N=59 are of special interest, because they are just at the border between the two regions. Very recently, we have studied odd-neutrons and odd-odd nuclei with N=59, by means of prompt $\gamma$-ray spectroscopy of the spontaneous fission of $^{247}$Cm, using the EUROGAM 2 multi-detector, and by measurements of $\mu$s isomers produced by fission of $^{239,241}$Pu with thermal neutrons at ILL (Grenoble). In the latter case, the detection is based on time correlation measurements between fission fragments detected by the LOHENGRIN mass spectrometer and $\gamma$-rays or conversion electrons from the isomer decay. It was found that three shapes coexist in the odd $^{97}$Sr and $^{99}$Zr and two shapes coexist in the odd-odd $^{96}$Rb. A simple explanation of the shape-coexistence mechanism is proposed. It is based upon the Nilsson diagram and stresses the fundamental importance of the unique parity states.

Published
2005

10. Recent Results and Future Prospects for Nuclear Structure Studies at the ILL

Author

Gary Simpson, J. A. Pinston, W. Urban, J. Genevey, I. Tsekhanovich, Institut Laue-Langevin (ILL), ILL, 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), Goutte H., Faust H., Fioni G., and Goutte D.

Subjects
Physics, Fission products, Spectrometer, Nuclear structure, Gamma ray, 020206 networking & telecommunications, 02 engineering and technology, Electron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear physics, Isomeric shift, Microsecond, 0202 electrical engineering, electronic engineering, information engineering, 020201 artificial intelligence & image processing, Neutron, Atomic physics, 21.10.Tg, 23.20.Lv, 25.85.EC, 27.60.+j
Abstract

The Lohengrin fission-product spectrometer at the ILL offers some unique opportunities to study the structure of very rare neutron-rich nuclei near 132Sn, in the mass A~100 region and in the A~160 region using microsecond isomeric gamma rays. Techniques to measure isomeric gamma rays, conversion electrons, excited-state lifetimes in the pico-to-nanosecond domain and g factors will be presented. New results on an isomeric state in 98Zr will also be discussed. A 2.5 µs isomeric 17– state at 6.5 MeV has recently been measured with the Lohengrin spectrometer in 98Zr. This spherical isomeric state is believed to have a $(\pi(p_{1/2}^{-2}g_{9/2}^{2})\nu(g_{7/2}^{1}h_{11/2}^1))17–$ configuration and decays into two collective bands. One of the collective bands has a vibrational character, which becomes rotational at higher spins. An idea to build a neutron guide for nuclear structure experiments on very neutron-rich nuclei at the ILL is currently being discussed. A brief outline of a recent neutron-guide experiment will be presented.

Published
2005

11. Neutron driven nuclear transmutation by adiabatic resonance crossing

Author

Federico Carminati, Loukas Sakelliou, C. López, A. Tzima, O. Méplan, A. Apostolakis, D. Heuer, M. Hussonnois, M. Perlado, Ioannis Papadopoulos, C. A. Bompas, J.B. Viano, M. Embid, J. Tamarit, P. Pavlopoulos, J.M. Loiseaux, A. Giorni, S. Dı́ez, J. Aleixandre, G. Zarris, M. Macri, F. Casagrande, S. Andriamonje, E. Pérez, Alberto Abánades, H. Arnould, R. Del Moral, I. Goulas, S. Vieira, O. González, E. Cerro, J. A. Rubio, J. Galvez, C. Roche, K. Sakelariou, C. Geles, C. Rubbia, E. González, Panagiotis Kokkas, C. Eleftheriadis, J. A. Garcia, Vasilis Vlachoudis, J. P. Revol, V. Lacoste, Y. Kadi, A. Angelopoulos, S. Buono, H. Nifenecker, F. Saldana, J. Bueno, D. Trubert, C. Le Naour, R. Klapisch, F. Attale, R. Fernandez, A. Pérez-Navarro, E. Belle, M. Poza, G. Kittis, F. Schussler, P. Cennini, 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), Fioni G. Faust H. Oberstedt S. Hambsch F.-J., and bibliotheque, LPSC

Subjects
Physics, Nuclear reaction, Nuclear transmutation, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], 010308 nuclear & particles physics, Fission, Nuclear engineering, Radioactive waste, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010403 inorganic & nuclear chemistry, 7. Clean energy, 01 natural sciences, Resonance (particle physics), 0104 chemical sciences, Energy amplifier, Nuclear physics, 0103 physical sciences, Neutron, Nuclear Experiment, Adiabatic process
Abstract

The use of accelerator driven system (ADS) like for instance the Energy Amplifier concept (EA) proposed by C. Rubbia and his group might be one of the solutions to solve the energy problem and in particular to answer the question: what could we do with the nuclear waste produced by the present nuclear reactors? We present in this paper the EA concept, which is illustrated by two experiments performed at the CERN-PS facility. One of them is the TARC (Transmutation by Adiabatic Resonance crossing) experiment which is designed to demonstrate the high efficiency offered by the EA to destroy the long-lived fission fragments.

Published
1998

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