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121 results on '"Meot, V."'

1. First simultaneous measurement of the gamma-ray and neutron emission probabilities in inverse kinematics at a heavy-ion storage ring

Author

Sguazzin, M., Jurado, B., Pibernat, J., Swartz, J. A., Grieser, M., Glorius, J., Litvinov, Yu. A., Berthelot, C., Włoch, B., Adamczewski-Musch, J., Alfaurt, P., Ascher, P., Audouin, L., Blank, B., Blaum, K., Brückner, B., Dellmann, S., Dillmann, I., Domingo-Pardo, C., Dupuis, M., Erbacher, P., Flayol, M., Forstner, O., Freire-Fernández, D., Gerbaux, M., Giovinazzo, J., Grévy, S., Griffin, C. J., Gumberidze, A., Heil, S., Heinz, A., Hess, R., Kurtulgil, D., Kurz, N., Leckenby, G., Litvinov, S., Lorentz, B., Méot, V., Michaud, J., Pérard, S., Petridis, N., Popp, U., Ramos, D., Reifarth, R., Roche, M., Sanjari, M. S., Sidhu, R. S., Spillmann, U., Steck, M., Stöhlker, Th., Thomas, B., Thulliez, L., and Versteegen, M.

Subjects
Nuclear Experiment
Abstract

The probabilities for gamma-ray and particle emission as a function of the excitation energy of a decaying nucleus are valuable observables for constraining the ingredients of the models that describe the de-excitation of nuclei near the particle emission threshold. These models are essential in nuclear astrophysics and applications. In this work, we have for the first time simultaneously measured the gamma-ray and neutron emission probabilities of 208Pb. The measurement was performed in inverse kinematics at the Experimental Storage Ring (ESR) of the GSI/FAIR facility, where a 208Pb beam interacted through the 208Pb(p,p') reaction with a hydrogen gas jet target. Instead of detecting the gamma-rays and neutrons emitted by 208Pb, we detected the heavy beam-like residues produced after gamma and neutron emission. These heavy residues were fully separated by a dipole magnet of the ESR and were detected with outstanding efficiencies. The comparison of the measured probabilities with model calculations has allowed us to test different descriptions of the gamma-ray strength function and the nuclear level density available in the literature., Comment: 23 pages, 13 figures

Published
2024

2. First measurement of the neutron-emission probability with a surrogate reaction in inverse kinematics at a heavy-ion storage ring

Author

Sguazzin, M., Jurado, B., Pibernat, J., Swartz, J. A., Grieser, M., Glorius, J., Litvinov, Yu. A., Adamczewski-Musch, J., Alfaurt, P., Ascher, P., Audouin, L., Berthelot, C., Blank, B., Blaum, K., Brückner, B., Dellmann, S., Dillmann, I., Domingo-Pardo, C., Dupuis, M., Erbacher, P., Flayol, M., Forstner, O., Freire-Fernández, D., Gerbaux, M., Giovinazzo, J., Grévy, S., Griffin, C. J., Gumberidze, A., Heil, S., Heinz, A., Hess, R., Kurtulgil, D., Kurz, N., Leckenby, G., Litvinov, S., Lorentz, B., Méot, V., Michaud, J., Pérard, S., Petridis, N., Popp, U., Ramos, D., Reifarth, R., Roche, M., Sanjari, M. S., Sidhu, R. S., Spillmann, U., Steck, M., Stöhlker, Th., Thomas, B., Thulliez, L., Versteegen, M., and Włoch, B.

Subjects
Nuclear Experiment
Abstract

Neutron-induced reaction cross sections of short-lived nuclei are imperative to understand the origin of heavy elements in stellar nucleosynthesis and for societal applications, but their measurement is extremely complicated due to the radioactivity of the targets involved. One way of overcoming this issue is to combine surrogate reactions with the unique possibilities offered by heavy-ion storage rings. In this work, we describe the first surrogate-reaction experiment in inverse kinematics, which we successfully conducted at the Experimental Storage Ring (ESR) of the GSI/FAIR facility, using the 208Pb(p,p') reaction as a surrogate for neutron capture on 207Pb. Thanks to the outstanding detection efficiencies possible at the ESR, we were able to measure for the first time the neutron-emission probability as a function of the excitation energy of 208Pb. We have used this probability to select different descriptions of the gamma-ray strength function and nuclear level density, and provide reliable results for the neutron-induced radiative capture cross section of 207Pb at energies for which no experimental data exist., Comment: 10 pages and 5 figures

Published
2023

3. Questioning the 239Pu(n,2n)238Pu cross section shape above emission threshold

Author

Bouland, O., Meot, V., and Roig, O.

Subjects
Nuclear Theory, Nuclear Experiment, Physics - Applied Physics
Abstract

In the light of the JEF(F) European project longstanding story according to the determination of the most exact shape of the 239Pu(n, 2n)238Pu reaction cross section and a recent measurement by Meot et al., this paper aims to shed another light on this topic by bringing new theoretical feedback. To achieve this goal, the AVXSF-LNG computer program has been upgraded to model second-chance reactions using its decay-probability module and, then chained to the TALYS-ECIS06 nuclear reaction system of codes. Present diligent calculation of the (n,2n) cross section over the energy range from the threshold to the onset of third-chance fission at about 12 MeV, suggests that current evaluations under-estimate the 239Pu(n,2n) cross section below 10 MeV; under-estimation of the order of 7% relatively to the JEFF-3.1 evaluation. On this ground, we propose an upward correction to the normalization of the measurement by Meot et al. Correction factor of about 1.24 with a maximum uncertainty on present fitted model estimated to 11.6%. Latter value is extracted from a sensitivity analysis of the calculation route to the level density model that is selected for the non-equilibrated residual nucleus and to alternative choices we can make in terms of neutron fission cross section measurement references for the 238Pu and 239Pu target nuclei., Comment: 27 pages, 31 figures

Published
2022

4. Expected yields of $^{181}$Ta (e,e') $^{181}$Ta$^*$ in the multi-keV range with a plasma-cathode electron beam

Author

Gobet, F., Dzyublik, A. Ya., Gosselin, G., Méot, V., and Versteegen, M.

Subjects
Nuclear Theory, Nuclear Experiment, Physics - Atomic Physics, Physics - Plasma Physics
Abstract

Calculations of the cross sections of inelastic electron scattering $(e,e')$ on a nucleus in the multi-keV energy range strongly depend on the description of the screening of the nuclear Coulomb potential as well as on the deformation of the wave functions of the incoming and outgoing electron in the vicinity of the nucleus. These cross sections are evaluated at values lower than $10^{-30}$ cm$^2$ which vary by several orders of magnitude according to the models. Experimental measurements would be required to constrain the models but it is a real challenge to measure such low cross sections. In this study, we demonstrate that inelastic electron scattering is the main nuclear excitation mechanism in a $^{181}$Ta target irradiated with a new intense 10 - 30 keV electron beam produced with a biased laser-plasma. Calculations show that through the detection of conversion electrons, it should be possible to measure the nuclear excitation yields. The effect of electron beam heating and of plasma deposition on the tantalum target are quantified, thus allowing the dimensioning of a possible experimental configuration to study $(e,e')$ processes in this range of energy for the first time.

Published
2022
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5. Laser Driven Nuclear physics at ELINP

Author

Negoita, F., Roth, M., Thirolf, P. G., Tudisco, S., Hannachi, F., Moustaizis, S., Pomerantz, I., Mckenna, P., Fuchs, J., Sphor, K., Acbas, G., Anzalone, A., Audebert, P., Balascuta, S., Cappuzzello, F., Cernaianu, M. O., Chen, S., Dancus, I., Freeman, R., Geissel, H., Ghenuche, P., Gizzi, L., Gobet, F., Gosselin, G., Gugiu, M., Higginson, D., D¶Humiêres, E., Ivan, C., Jaroszynski, D., Kar, S., Lamia, L., Leca, V., Neagu, L., Lanzalone, G., Meot, V., Mirfayzi, S. R., Mitu, I. O., Morel, P., Murphy, C., Petcu, C., Petrascu, H., Petrone, C., Raczka, P., Risca, M., Rotaru, F., Santos, J. J., Schumacher, D., Stutman, D., Tarisien, M., Tataru, M., Tatulea, B., Turcu, I. C. E., Versteegen, M., Ursescu, D., Gales, S., and Zamfir, N. V.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

High power lasers have proven being capable to produce high energy gamma rays, charged particles and neutrons to induce all kinds of nuclear reactions. At ELI, the studies with high power lasers will enter for the first time into new domains of power and intensities.

Published
2022

6. Simultaneous determination of neutron-induced fission and radiative-capture cross sections from decay probabilities obtained with a surrogate reaction

Author

Sanchez, R. Perez, Jurado, B., Meot, V., Roig, O., Dupuis, M., Bouland, O., Denis-Petit, D., Marini, P., Mathieu, L., Tsekhanovich, I., Aiche, M., Audouin, L., Cannes, C., Czajkowski, S., Delpech, S., Gorgen, A., Guttormsen, M., Henriques, A., Kessedjian, G., Nishio, K., Ramos, D., Siem, S., and Zeiser, F.

Subjects
Nuclear Experiment
Abstract

Reliable neutron-induced reaction cross sections of unstable nuclei are essential for nuclear astrophysics and applications but their direct measurement is often impossible. The surrogate-reaction method is one of the most promising alternatives to access these cross sections. In this work, we successfully applied the surrogate-reaction method to infer for the first time both the neutron-induced fission and radiative-capture cross sections of 239Pu in a consistent manner from a single measurement. This was achieved by combining simultaneously-measured fission and gamma-emission probabilities for the 240Pu(4He,4He') surrogate reaction with a calculation of the angular-momentum and parity distributions populated in this reaction. While other experiments measure the probabilities for some selected gamma-ray transitions, we measure the gamma-emission probability. This enlarges the applicability of the surrogate-reaction method., Comment: 8 pages, 3 figures

Published
2020
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7. A versatile and compact high-intensity electron beam for multi-kGy irradiation in nano or micro-electronic devices

Author

Gobet, F., Gardelle, J., Versteegen, M., Courtois, L., Leblanc, S., and Méot, V.

Subjects
Physics - Applied Physics, Physics - Accelerator Physics, Physics - Plasma Physics
Abstract

A compact low-energy and high-intensity electron source for material aging applications is presented. A laser-induced plasma moves inside a 30 kV diode and produces a 5 MW electron beam at the anode location. The corresponding dose that can be deposited into silicon or gallium samples is estimated to be 25 kGy per laser shot. The dose profile strongly depends on the cathode voltage and can be adjusted from 100 nm to 1 $\mu$m. With this versatile source, a path is opened to study micro or nano-electronic components under high irradiation, without the standard radioprotection issues.

Published
2020
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8. First investigation of the response of solar cells to heavy ions above 1 AMeV

Author

Henriques, A., Jurado, B., Pibernat, J., Thomas, J. C., Denis-Petit, D., Chiron, T., Gaudefroy, L., Glorius, J., Litvinov, Yu. A., Mathieu, L., Méot, V., Pérez-Sánchez, R., Roig, O., Spillmann, U., Thomas, B., Thomas, B. A., Tsekhanovich, I., Varga, L., and Xing, Y.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

Solar cells have been used since several decades for the detection of fission fragments at about 1 AMeV. The advantages of solar cells regarding their cost (few euros) and radiation damage resistance make them an interesting candidate for heavy ion detection and an appealing alternative to silicon detectors. A first exploratory measurement of the response of solar cells to heavy ions at energies above 1 AMeV has been performed at the GANIL facility, Caen, France. Such measurements were performed with 84Kr and 129Xe beams ranging from 7 to 13 AMeV. The energy and time response of several types of solar cells were studied. The best performance was observed for cells of 10x10 mm2, with an energy and time resolution of {\sigma}(E)/E=1.4% and 3.6 ns (FWHM), respectively. Irradiations at rates from a few hundred to 106 particles per second were also performed to investigate the behavior of the cells with increasing intensity., Comment: 13 pages, 14 figures

Published
2019
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9. Experimental set-up for the simultaneous measurement of fission and gamma-emission probabilities induced by transfer or inelastic-scattering reactions

Author

Sánchez, R. Pérez, Jurado, B., Marini, P., Aiche, M., Czajkowski, S., Denis-Petit, D., Ducasse, Q., Mathieu, L., Tsekhanovich, I., Henriques, A., Méot, V., and Roig, O.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

Fission and gamma-emission probabilities induced by transfer or inelastic scattering reactions with light projectile nuclei are very valuable quantities for constraining the models that describe the de-excitation of heavy nuclei. We have developed an experimental set-up that allows us to simultaneously measure fission and gamma-emission probabilities. The measurement of the gamma-emission probability at excitation energies where the fission channel is open is challenging due to the intense background of gamma rays emitted by the fission fragments. We discuss the procedure to subtract such a background and the constraints that this subtraction and other experimental conditions put on the set up. We show that our set-up complies with these constraints., Comment: 18 pages, 10 figures

Published
2019
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10. Signatures of fluid and kinetic properties in the energy distributions of multicharged Ta ions from nanosecond laser-heated plasma

Author

Gobet, F., Comet, M., Marques, J-R., Meot, V., Raymond, X., Versteegen, M., Henares, J. -L., and Morice, O.

Subjects
Physics - Plasma Physics
Abstract

The energy distributions of Ta ions produced in a nanosecond laser-heated plasma at 4$\times$10$^{15}$ W/cm$^{2}$ are experimentally and theoretically investigated. They are measured far from the target with an electrostatic spectrometer and charge collectors. Shadowgraphy and interferometry are used to characterize the plasma dynamics in the first nanoseconds of the plasma expansion for electron densities ranging from 10$^{18}$ to 10$^{20}$ cm$^{-3}$. The experimental data clearly show two components in the energy distributions which depend on the ion charge states. These components are discussed in light of fluid and kinetic descriptions of the expanding plasma. In particular, quantitative comparisons with calculations performed with 3D hydrodynamic (Troll) and 1D3V Particle In Cell (XooPIC) codes demonstrate that a double layer created at the plasma-vacuum interface plays a crucial role in the acceleration of the highest charge state ions at high energy., Comment: Accepted for publication in Physical Review E

Published
2018
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11. Future Perspectives for Surrogate-Reaction Studies at Storage Rings

Author

Henriques, A., Jurado, B., Denis-Petit, D., Chiron, T., Gaudefroy, L., Glorius, J., Grieser, M., Langer, C., Litvinov, Y. A., Mathieu, L., Méot, V., Pérez-Sánchez, R., Pibernat, J., Reifarth, R., Roig, O., Thomas, B., Thomas, B. A., Thomas, J. C., Tsekhanovich, I., Escher, Jutta, editor, Alhassid, Yoram, editor, Bernstein, Lee A., editor, Brown, David, editor, Fröhlich, Carla, editor, Talou, Patrick, editor, and Younes, Walid, editor

Published
2021
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12. Study of the 238U(d,p) surrogate reaction via the simultaneous measurement of gamma-decay and fission probabilities

Author

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

Subjects
Nuclear Experiment
Abstract

We investigated the 238U(d,p) reaction as a surrogate for the n + 238U reaction. For this purpose we measured for the first time the gamma-decay and fission probabilities of 239U* 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 and distorted-wave Born approximations were used to correct our data from detected protons originating from elastic and inelastic deuteron breakup. In the region where the fission and gamma-decay probabilities compete, the corrected fission probability is in agreement with neutron-induced data, whereas the gamma-decay probability is much higher than the neutron-induced data. The performed statistical-model calculations are not able to explain these results., Comment: Includes modifications due to referee remarks

Published
2015
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14. Search for Superscreening effect in Superconductor

Author

Ujic, P., Santos, F. de Oliveira, Lewitowicz, M., Achouri, L., Assié, M., Bastin, B., Borcea, C., Borcea, R., Buta, A., Coc, A., De France, G., Kamalou, O., Kiener, J., Lepailleur, A., Meot, V., Pautrat, A., Laurent, M. G. Saint, Sorlin, O., Stanoiu, M., and Tatischef, V.

Subjects
Nuclear Experiment
Abstract

The decay of $^{19}$O($\beta^-$) and $^{19}$Ne($\beta^+$) implanted in niobium in its superconducting and metallic phase was measured using purified radioactive beams produced by the SPIRAL/GANIL facility. Half-lives and branching ratios measured in the two phases are consistent within one-sigma error bar. This measurement casts strong doubts on the predicted strong electron screening in superconductor, the so-called superscreening. The measured difference in screening potential energy is 110(90) eV for $^{19}$Ne and 400(320) eV for $^{19}$O. Precise determinations of the half-lives were obtained for $^{19}$O: 26.476(9) s and $^{19}$Ne: 17.254(5) s., Comment: 4 pages, 3 figures, accepted for publication in Physical Review Letters

Published
2012
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20. g-factor of the 9/2+ isomeric state in 65Ni from transfer reaction

Author

Georgiev, G., Matea, I., Balabanski, D. L., Daugas, J. M., de Oliveira Santos, F., Franchoo, S., Ibrahim, F., Le Blanc, F., Lewitowicz, M., Lo Bianco, G., Lukyanov, S., Meot, V., Morel, P., Neyens, G., Penionzhkevich, Yu. E., Saltarelli, A., Sorlin, O., Stanoiu, M., Tarisien, M., Vermeulen, N., Verney, D., and Yordanov, D.

Published
2006
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21. Absolute energy distributions of Al, Cu, and Ta ions produced by nanosecond laser-generated plasmas at 1013Wcm–2.

Author

Comet, M., Versteegen, M., Gobet, F., Denis-Petit, D., Hannachi, F., Meot, V., and Tarisien, M.

Subjects
PROPERTIES of matter, ELECTRONS, INTERMEDIATES (Chemistry), ELECTROLYSIS, ION energy
Abstract

The charge state and energy distributions of ions produced by a pulsed 1 J, 9 ns Nd:YAG laser focused onto solid aluminum, copper, and tantalum targets were measured with an electrostatic analyzer coupled with a windowless electron multiplier detector. Special attention was paid to the detector response function measurements and to the determination of the analyzer transmission. Space charge effects are shown to strongly affect this transmission. Measured absolute energy distributions are presented for several charge states. They follow Boltzmannlike functions characterized by an effective ion temperature and an equivalent accelerating voltage. These parameters exhibit power laws as a function of I λ2 which open the possibility to predict the expected shape of the relative energy distributions of ions on a large range of laser intensities (106–1016Wcm–2 µm2). [ABSTRACT FROM AUTHOR]

Published
2016
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22. Absolute energy distributions of Al, Cu, and Ta ions produced by nanosecond laser-generated plasmas at 1013Wcm-2.

Author

Comet, M., Versteegen, M., Gobet, F., Denis-Petit, D., Hannachi, F., Meot, V., and Tarisien, M.

Subjects
SPECTRAL energy distribution, KINETIC energy, INTERMEDIATES (Chemistry), PROPERTIES of matter, NATIVE element minerals, THERMODYNAMIC state variables
Abstract

The charge state and energy distributions of ions produced by a pulsed 1 J, 9 ns Nd:YAG laser focused onto solid aluminum, copper, and tantalum targets were measured with an electrostatic analyzer coupled with a windowless electron multiplier detector. Special attention was paid to the detector response function measurements and to the determination of the analyzer transmission. Space charge effects are shown to strongly affect this transmission. Measured absolute energy distributions are presented for several charge states. They follow Boltzmannlike functions characterized by an effective ion temperature and an equivalent accelerating voltage. These parameters exhibit power laws as a function of I λ² which open the possibility to predict the expected shape of the relative energy distributions of ions on a large range of laser intensities (106-1016Wcm-2 μm²). [ABSTRACT FROM AUTHOR]

Published
2016
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26. Scintillators in High-Power Laser-Driven Experiments

Author

Tarisien, M., primary, Henares, J. L., additional, Baccou, C., additional, Bonnet, T., additional, Boulay, F., additional, Gobet, F., additional, Gugiu, M., additional, Hannachi, F., additional, Kisyov, S., additional, Manailescu, C., additional, Meot, V., additional, Negoita, F., additional, Raymond, X., additional, Revet, G., additional, Tudor, L., additional, and Versteegen, M., additional

Published
2018
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29. Investigation of the surrogate-reaction method via the simultaneous measurement of gamma-emission and fission probabilities

Author

Jurado, B., Marini, P., Mathieu, L., Aiche, M., Czájkowski, S., Tsekhanovich, I., Audouin, L., Boutoux, G., Denis-Petit, D., Guttormsen, M., Kessedjian, G., Lebois, M., Meot, V., Oberstedt, A., Oberstedt, S., Roig, O., Serot, Olivier, Tassan-Got, L., Wilson, J., Schillebeeckx, P., 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), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Centre National de la Recherche Scientifique (CNRS), Institute for Systems, Informatics and Safety [Ispra], European Commission - Joint Research Centre [Ispra] (JRC), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])

Subjects
Inverse kinematics, 010308 nuclear & particles physics, Chemistry, Fission, Neutron emission, Physics, QC1-999, Astrophysics::High Energy Astrophysical Phenomena, Gamma ray, Statistical model, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Interpretation (model theory), Nuclear physics, 0103 physical sciences, 010306 general physics, Nuclear Experiment
Abstract

International audience; We present the results of two experiments where we have measured for the first time simultaneously the fission and gamma-decay probabilities induced by different surrogate reactions. In particular, we have investigated the 238U(d,p), 238U(3He,t) and 238U(3He,4He) reactions as surrogates for the neutron-induced n + 238U, n + 237Np and n + 236U reactions, respectively. In the region where gamma emission, neutron emission and fission compete, our results for the fission probabilities agree fairly well with the neutron-induced data, whereas our gamma-decay probabilities are significantly higher than the neutron-induced data. The interpretation of these results is not obvious and is discussed within the framework of the statistical model with preliminary results for calculated spin-parity distributions populated in surrogate reactions. We also present future plans for surrogate-reaction studies in inverse kinematics with radioactive-ion beams at storage rings.

Published
2016

30. High spin investigation in 193Pb with EUROGAM 2: coexistence of superdeformed and dipole bands

Author

Astier, A., Ducroux, L., Duffait, R., Le Coz, Y., Meyer, M., Perries, S., Redon, N., Sharpey-Schafer, J.F., Wilson, A.N., Gall, B.J.P., Collatz, R., Deloncle, I., Hannachi, F., Lopez-Martens, A., Porquet, M.G., Schück, C., Azaiez, F., Bouneau, S., Bourgeois, C., Korichi, A., Poffé, N., Sergolle, H., Lucas, R., Meot, V., Hibbert, I., and Wadsworth, R.

Published
1997
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31. Confirmation of the existence of a superdeformed rotational band in192Pb

Author

Ducroux, L., Astier, A., Béraud, R., Duffait, R., Le Coz, Y., Meyer, M., Perries, S., Redon, N., Sharpey-Schafer, J. F., Wilson, A. N., Collatz, R., Deloncle, I., Hannachi, F., Kaci, M., Lopez-Martens, A., Porquet, M. G., Schück, C., Azaiez, F., Bouneau, S., Bourgeois, C., Duprat, J., Korichi, A., Perrin, N., Poffé, N., Sergolle, H., Goutte, D., Lucas, R., Meot, V., Hibbert, I., Wadsworth, R., Beck, F., Curien, D., De France, G., Duchêne, G., Gall, B., Haas, B., and Vivien, J. P.

Published
1995
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32. Nuclear excitation by electron transition rate confidence interval in a $^{201}$Hg local thermodynamic equilibrium plasma

Author

Comet, M., Gosselin, G., Meot, V., Morel, Pierre, Pain, J.-C., Denis-Petit, D., Gobet, F., Hannachi, F., Tarisien, M., Versteegen, M., Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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), 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
[PHYS]Physics [physics]
Abstract

International audience; Nuclear excitation by electron transition (NEET) is predicted to be the dominant excitation process of the first^{201}Hg isomeric state in a laser heated plasma. This process may occur when the energy difference between a nuclear transition and an atomic transition is close to zero, provided the quantum selection rules are fulfilled. At local thermodynamic equilibrium, an average atom model may be used, in a first approach, to evaluate the NEET rate in plasma. The statistical nature of the electronic transition spectrum is then described by the means of a Gaussian distribution around the average atom configuration. However, using a continuous function to describe the electronic spectrum is questionable in the framework of a resonant process, such as NEET. In order to get an idea of when it can be relied upon to predict a NEET rate in plasma, we present in this paper a NEET rate calculation using a model derived from detailed configuration accounting. This calculation allows us to define a confidence interval of the NEET rate around its average atom mean value, which is the first step to design afuture experiment.

Published
2015

33. Neutron-induced Cross Sections of Actinides via the Surrogate-reaction Method

Author

Ducasse, Q., Jurado, B., Aiche, M., Mathieu, L., Tornyi, T., Görgen, A., Wilson, J.N., Barreau, G., Companis, I., Czajkowski, S., Giacoppo, F., Gunsing, F., Guttormsen, M., Larsen, A.C., Lebois, M., Matarranz, J., Renstrøm, T., Rose, S., Siem, S., Tsekhanovich, I., Tveten, G.M., Hagen, T.W., Wiedeking, M., Serot, O., Boutoux, G., Chau, P., Méot, V., and Roig, O.

Published
2014
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36. First preparatory experiments on NEET at GSI

Author

Frank, A., Bagnoud, V., Gobet, F., Gosselin, G., Meot, V., Morel, P., Roig, O., Roth, M., Tarisien, M., Tauschwitz, An., Versteegen, M., Hannachi, F., Basko, M., Blazevic, A., Bonnet, T., Comet, M., Daugas, J. M., Denis-Petit, D., Ebran, A., and Gaudefroy, L.

Published
2013

38. Nuclear Physics experiments with high energy lasers

Author

Gobet, F., Hannachi, F., Plaisir, C., Tarisien, M., Bonnet, T., Versteegen, M., Aleonard, M.M., Gosselin, G., Meot, V., Morel, Pierre, 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), and Mas, Virginie

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2010

39. Isomer population/depopulation in plasma with petawatt laser

Author

GOBET, F., PLAISIR, C., HANNACHI, F., TARISIEN, M., ALÉONARD, M.M., MEOT, V., GOSSELIN, G., MOREL, Pierre, 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), 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), 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 Mas, Virginie

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2010

40. Nuclear Physics with high energy lasers

Author

Hannachi, F., Plaisir, C., Gobet, F., Tarisien, M., Aleonard, M.M., Gosselin, G., Meot, V., Morel, Pierre, Mas, Virginie, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2010

41. Cross section measurements for the study of the de-excitation of nuclear isomeric states in plasma

Author

Plaisir, C., Hannachi, F., Gobet, F., Tarisien, M., Aleonard, M.M., Meot, V., Gosselin, G., Morel, Pierre, Morillon, B., Mas, Virginie, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2010

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

Author

Czajkowski, S., Boutoux, G., Kessedjian, G., Aïche, M., Barreau, G., Bidaud, A., Dassié, D., Haas, B., Jurado, B., Mathieu, L., Audouin, L., Capellan, N., Tassan-Got, L., Wilson, J., Berthoumieux, E., Gunsing, F., Ch. Theisen, Olivier Serot, Eric Bauge, Meot, V., Roig, O., Ahmad, I., Greene, J. P., Janssens, R. V. F., J Hambsch, F., Obertstedt, S., Schillebeeckx, P., Mas, Virginie, 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), 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, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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), Physics Division, Argonne National Laboratory, Argonne National Laboratory [Lemont] (ANL), 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)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
[PHYS.NUCL] Physics [physics]/Nuclear Theory [nucl-th], [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]
Published
2009

43. Study of beta-delayed charged particle emission of 11Li: evidence of new decay channels

Author

Madurga, M., Borge, M. J. G., Angelique, J. C., Bao, L., Bergmann, U., Butacheck, A., Cederkäll, J., Daugas, J. M., Diget, Christian Aaen, Fraile, L. M., Fynbo, Hans Otto Uldall, Jeppesen, Henrik, Jonson, B., Lienard, E., Marques, F., Meot, V., Negoita, F., Nilsson, T., Nyman, G., Perrot, F., Riisager, Karsten, Roig, O., Tengblad, O, Tengbom, E., Turrion, M., and Rollander, K. W.

Published
2008

44. Half-life of the first excited state of 201 Hg

Author

Meot, V., Aupiais, J., Morel, Pierre, Gosselin, G., Gobet, F., Scheurer, J.-N., Tarisien, M., Département de Physique Théorique et Appliquée (DPTA), 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)-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), 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), 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
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 21.10.Tg, 23.20.Nx, 29.25.Rm
Abstract

The lifetime of the first excited state of 201Hg, populated by the 201Tl electron capture decay and subsequent g-ray transitions, has been measured for the first time. This measurement has been carried out using a coincidence between an internal conversion electron and a g-ray. The half-life of 81±5 ns has been obtained and B(E2) and B(M1) values were deduced and compared to previous estimates. With these reduced matrix elements, the excitation rate of the first excited state of 201Hg in plasma have been calculated in the frame of a NEET process.

Published
2007

45. Precise Measurements of the Deuteron A(q2) Structure Function

Author

Hachemi, H., primary, Amroun, A., additional, Auffret, S., additional, Cavedon, J. M., additional, Dreux, P., additional, Duclos, J., additional, Frois, B., additional, Goutte, D., additional, Martino, J., additional, Meot, V., additional, Phan, X. H., additional, Platchkov, S., additional, and Sick, I., additional

Published
1987
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46. Heating of Tantalum plasma for studies on the activation of the 6.238 keV nuclear level of Ta-181

Author

Fedosejevs, R., Gobet, F., Dorchies, F., Fourment, C., Hannachi, F., Aléonard, M.M., Claverie, G., Malka, G., Scheurer, J.N., Tarisien, M., Meot, V., Morel, Pierre, Liesfeld, B., Robson, L., Blasco, F., Descamps, D., Schurtz, G., Nicolai, Ph., Tikhonchuk, V., Centre d'Etudes Lasers Intenses et Applications (CELIA), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Bordeaux (UB), 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), Service de Physique Nucléaire (SERVICE DE PHYSIQUE NUCLéAIRE), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), C. Hidalgo, B.Ph. van Milligen, Université de Bordeaux (UB)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-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
ComputingMethodologies_GENERAL, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ComputingMilieux_MISCELLANEOUS
Abstract

Poster n° P1.152; International audience

Published
2005

47. Search for nuclear excitation by electronic transition in $^{235}$U

Author

Claverie, G., Aléonard, M.M., Chemin, J.F., Gobet, F., Hannachi, F., Harston, M.R., Malka, G., Scheurer, J.N., Morel, Pierre, Meot, V., 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), Service de Physique Nucléaire (SERVICE DE PHYSIQUE NUCLéAIRE), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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 isomerism, nuclei with mass number 220 or higher, nuclear energy level transitions, nuclear energy levels, 23.90.+w, 27.90.+b, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

We have searched for the nuclear excitation by electronic transition (NEET) of the isomeric level at 76 eV in $^{235}$U in a plasma induced by a YAG laser with an energy of 1 Joule and a full width at half maximum time distribution of 5 ns, operating at an intensity of 10$^{13}$ W cm$^{–2}$. We present a thorough description of the experimental conditions and analysis of our data. In this experimental situation we do not detect any excitation of the isomeric level, a result that is at variance with a previously reported one. An upper limit of 6×10$^{–6}$ per atom and per second averaged over the laser-pulse width has been set on the nuclear excitation rate. This value is compared with results obtained in previous experimental and theoretical works.

Published
2004

48. Low energy levels in $^{72}$Ni

Author

Sawicka, M., Grzywacz, R., Matea, I., Grawe, H., Pfutzner, M., Daugas, J.M., Lewitowicz, M., Balabanski, D.L., Becker, F., Belier, G., Bingham, C., Borcea, C., Bouchez, E., Buta, A., La Commara, M., Dragulescu, E., De France, G., Georgiev, G., Giovinazzo, J., Gorska, M., Hammache, F., Hass, M., Hellstrom, M., Ibrahim, F., Janas, Z., Mach, H., Mayet, P., Meot, V., Negoita, F., Neyens, G., de Oliveira Santos, Francois, Page, R.D., Perru, O., Podolyak, Zs., Roig, O., Rykaczewski, K.P., Saint-Laurent, M.G., Sauvestre, J.E., Sorlin, O., Stanoiu, M., Stefan, I., Stodel, C., Theisen, Ch., Verney, D., Zylicz, J., 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), 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), 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), 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
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2003

49. Search for Superscreening Effects in a Superconductor

Author

Ujić, Predrag, Santos, F. de Oliveira, Lewitowicz, Marek, Achouri, Lynda N., Assie, Marlène, Bastin, B., Borcea, C., Borcea, Ruxandra, Buta, Anna, Coc, A., de France, Gilles, Kamalou, O., Kiener, Jürgen K., Lepailleur, A., Meot, V., Pautrat, A., Saint Laurent, M. G., Sorlin, Olivier, Stanoiu, M., Tatischeff, V., Ujić, Predrag, Santos, F. de Oliveira, Lewitowicz, Marek, Achouri, Lynda N., Assie, Marlène, Bastin, B., Borcea, C., Borcea, Ruxandra, Buta, Anna, Coc, A., de France, Gilles, Kamalou, O., Kiener, Jürgen K., Lepailleur, A., Meot, V., Pautrat, A., Saint Laurent, M. G., Sorlin, Olivier, Stanoiu, M., and Tatischeff, V.

Abstract

The decay of O-19(beta(-)) and Ne-19(beta(+)) implanted in niobium in its superconducting and metallic phases was measured using purified radioactive beams produced by the SPIRAL GANIL facility. Half-lives and branching ratios measured in the two phases are consistent within a 1 sigma error bar. This measurement casts strong doubts on the predicted strong electron screening in a superconductor, the so-called superscreening. The measured difference in screening potential energy is 110(90) eV for Ne-19 and 400(320) eV for O-19. Precise determinations of the half-lives were obtained for O-19, 26.476(9) s, and for Ne-19, 17.254(5) s.

Published
2013

50. Evidence for an isomer in $^{76}$Ni

Author

Sawicka, M., Pfutzner, M., Grzywacz, R., Daugas, J. M., Matea, I., Lewitowicz, M., Grawe, H., Becker, F., Belier, G., Bingham, C., Borcea, R., Bouchez, E., Buta, A., Sauvestre, J. E., Georgiev, G., Giovinazzo, J., Hammache, F., Ibrahim, F., Mayet, P., Meot, V., Negoita, F., Francois de Oliveira Santos, Perru, O., Roig, O., Rykaczewski, K. P., Saint-Laurent, M. G., Sorlin, O., Stanoiu, M., Gheorghe Iulian Stefan, Stodel, C., Theisen, C., Verney, D., 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), 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 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), 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), 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
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

NESTER

Published
2002

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