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1. Complete isotopic distributions of fragments produced in transfer- and fusion-induced reactions

Author

Delaune O., Caamaño M., Farget F., Tarasov O.B., Derkx X., Schmidt K.-H., Audouin L., Amthor A.M., Bacri C.-O., Barreau G., Bastin B., Bazin D., Benlliure J., Blank B., Cacères L., Casarejos E., Fernández-Domínguez B., Gaudefroy L., Golabek C., Grévy S., Jurado B., Kamalou O., Lemasson A., Lukyanov S.M., Mittig W., Morrissey D.J., Navin A., Pereira J., Perrot L., Rejmund M., Roger T., Saint-Laurent M.G., Savajols H., Schmitt C., Sherrill B.M., Stodel C., Thomas J.C., and Villari A.C.C.

Subjects
Physics, QC1-999
Abstract

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 240 MeV 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 fusion-fission mechanism.

Published
2013
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2. Evolution of isotopic fission-fragment yields with excitation energy

Author

Bazin D., Bastin B., Barreau G., Bacri C.-O., Amthor A.M., Audouin L., Tarasov O.B., Schmidt K.-H, Farget F., Derkx X., Caamaño M., Delaune O., Benlliure J., Blank B., Cacères L., Casarejos E., Fernández-Domínguez B., Gaudefroy L., Golabek C., Grévy S., Jurado B., Kamalou O., Lemasson A., Lukyanov S.M., Mittig W., Morrissey D.J., Navin A., Pereira J., Perrot L., Rejmund M., Roger T., Saint-Laurent M.G., Savajols H., Schmitt C., Sherrill B.M., Stodel C., Taieb J., Thomas J.C., and Villari A.C.C.

Subjects
Physics, QC1-999
Abstract

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

Author

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

Subjects
Physics, QC1-999
Abstract

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
2010
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4. Characterization of the scission point from fission-fragment velocities

Author

Caamaño, M., Farget, F., Delaune, O., Schmidt, K. -H., Schmitt, C., Audouin, L., Bacri, C. -O., Benlliure, J., Casarejos, E., Derkx, X., Fernández-Domínguez, B., Gaudefroy, L., Golabek, C., Jurado, B., Lemasson, A., Ramos, D., Rodríguez-Tajes, C., Roger, T., and Shrivastava, A.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The isotopic-yield distributions and kinematic properties of fragments produced in transfer-induced fission of 240Pu and fusion-induced fission of 250Cf, with 9 MeV and 45 MeV of excitation energy respectively, were measured in inverse kinematics with the spectrometer VAMOS. The kinematic properties of identified fission fragments allow to derive properties of the scission configuration such as the distance between fragments, the total kinetic energy, the neutron multiplicity, the total excitation energy, and, for the first time, the proton- and neutron-number sharing during the emergence of the fragments. These properties of the scission point are studied as functions of the fragment atomic number. The correlation between these observables, gathered in one single experiment and for two different fissioning systems at different excitation energies, give valuable information for the understanding and modeling of the fission process., Comment: 12 pages, 8 figures

Published
2015
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5. Isotopic Yield Distributions of Transfer- and Fusion-Induced Fission from 238U+12C Reactions in Inverse Kinematics

Author

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

Subjects
Nuclear Experiment
Abstract

A novel 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 multi- nucleon transfer and fusion reactions in inverse kinematics, is applied in this work to reactions between a 238U beam and a 12C 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 ~ 80 and ~ 160, and from Z ~ 30 to ~ 64. For the first time, complete isotopic yield distributions of fragments from well-defined fissioning systems are available. Together with the precise measurement of the fragment emission angles and velocities, this technique gives further insight into the nuclear-fission process., Comment: 22 pages, 21 figures

Published
2013
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6. Isotopic fission fragment distributions as a deep probe to fusion-fission dynamics

Author

Farget, F., Caamano, M., Delaune, O., Tarasov, O. B., Derkx, X., Schmidt, K. -H., Amthor, A. M., Audouin, L., Bacri, C. -O., Barreau, G., Bastin, B., Bazin, D., Blank, B., Benlliure, J., Caceres, L., Casarejos, E., Chibihi, A., Fernandez-Dominguez, B., Gaudefroy, L., Golabek, C., Grevy, S., Jurado, B., Kamalou, O., Lemasson, A., Lukyanov, S., Mittig, W., Morrissey, D. J., Navin, A., Pereira, J., Perrot, L., Rejmund, M., Roger, T., Saint-Laurent, M. -G., Savajols, H., Schmitt, C., Sherill, B. M., Stodel, C., Taieb, J., Thomas, J. -C., and Villari, A. C.

Subjects
Nuclear Experiment
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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7. A {\mu}-TPC detector for the characterization of low energy neutron fields

Author

Golabek, C., Billard, J., Allaoua, A., Bosson, G., Bourrion, O., Grignon, C., Guillaudin, O., Lebreton, L., Mayet, F., Petit, M., Richer, J. -P., and Santos, D.

Subjects
Physics - Instrumentation and Detectors
Abstract

The AMANDE facility produces monoenergetic neutron fields from 2 keV to 20 MeV for metrological purposes. To be considered as a reference facility, fluence and energy distributions of neutron fields have to be determined by primary measurement standards. For this purpose, a micro Time Projection Chamber is being developed to be dedicated to measure neutron fields with energy ranging from 8 keV up to 1 MeV. In this work we present simulations showing that such a detector, which allows the measurement of the ionization energy and the 3D reconstruction of the recoil nucleus, provides the determination of neutron energy and fluence of these neutron fields.

Published
2012
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8. Study of $^{124}$Sn+$^{136}$Xe fusion-evaporation: analysis of a rare-event experiment

Author

Avez, Benoît, Drouart, Antoine, Stodel, Ch., Simenel, Cédric, Alcantara, J., Adamczyk, M., Banka, P., Bonnet, E., Clément, E., Dayras, R., Force, C., Golabek, C., Gonciarz, A., Grevy, S., Hauschild, K., Jacquet, D., Korichi, A., Kozik, T., Lazko, P., Morjean, M., Popeko, A., Roger, T., Saint-Laurent, M. -G., Sosin, Z., Sulignano, B., Theisen, C., Wieloch, A., Yeremin, A., Yilmaz, B., and Zielinska, M.

Subjects
Nuclear Experiment
Abstract

Fusion-evaporation in the $^{124}$Sn+$^{136}$Xe system is studied using a high intensity xenon beam provided by the Ganil accelerator and the LISE3 wien filter for the selection of the products. Due to the mass symmetry of the entrance system, the rejection of the beam by the spectrometer was of the order of $5times10^8$. We have thus performed a detailed statistical analysis to estimate random events and to infer the fusion-evaporation cross sections. No signicant decay events were detected and upper limit cross sections of 172 pb, 87 pb and 235 pb were deduced for the synthesis of $^{257}$Rf, $^{258}$Rf and $^{259}$Rf, respectively., Comment: 7 pages, 4 figures

Published
2011

9. MIMAC: A micro-tpc matrix project for directional detection of dark matter

Author

Santos, D., Billard, J., Bosson, G., Bouly, J. L., Bourrion, O., Fourel, Ch., Guillaudin, O., Mayet, F., Richer, J. P., Delbart, A., Ferrer, E., Giomataris, I., Iguaz, F. J., Mols, J. P., Golabek, C., and Lebreton, L.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Cosmology and Extragalactic Astrophysics
Abstract

Directional detection of non-baryonic DarkMatter is a promising search strategy for discriminating WIMP events from background ones. This strategy requires both a measurement of the recoil energy down to a few keV and 3D reconstruction of tracks down to a few mm. The MIMAC project, based on a micro-TPC matrix, filled with CF4 and CHF3 is being developed. The first results of a chamber prototype of this matrix, on low energy nuclear recoils (1H and 19F) obtained with mono-energetic neutron fields are presented. The discovery potential of this search strategy is illustrated by a realistic case accessible to MIMAC., Comment: Proceedings of the 3rd International Conference on Directional Detection of Dark Matter (CYGNUS 2011), Aussois- France- June 2011

Published
2011

10. Micromegas detector developments for MIMAC

Author

Ferrer-Ribas, E., Attié, D., Calvet, D., Colas, P., Druillole, F., Giomataris, Y., Iguaz, F. J., Mols, J. P., Pancin, J., Papaevangelou, T., Billard, J., Bosson, G., Bouly, J. L., Bourrion, O., Fourel, Ch., Grignon, C., Guillaudin, O., Mayet, F., Richer, J. P., Santos, D., Golabek, C., and Lebreton, L.

Subjects
Physics - Instrumentation and Detectors, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The aim of the MIMAC project is to detect non-baryonic Dark Matter with a directional TPC. The recent Micromegas efforts towards building a large size detector will be described, in particular the characterization measurements of a prototype detector of 10 $\times$ 10 cm$^2$ with a 2 dimensional readout plane. Track reconstruction with alpha particles will be shown., Comment: 8 pages, 7 figures Proceedings of the 3rd International conference on Directional Detection of Dark Matter (CYGNUS 2011), Aussois, France, 8-10 June 2011; corrections on author affiliations

Published
2011
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11. Micromegas detector developments for Dark Matter directional detection with MIMAC

Author

Iguaz, F. J., Attié, D., Calvet, D., Colas, P., Druillole, F., Ferrer-Ribas, E., Giomataris, I., Mols, J. P., Pancin, J., Papaevangelou, T., Billard, J., Bosson, G., Bouly, J. L., Bourrion, O., Fourel, Ch., Grignon, C., Guillaudin, O., Mayet, F., Richer, J. P., Santos, D., Golabek, C., and Lebreton, L.

Subjects
Physics - Instrumentation and Detectors
Abstract

The aim of the MIMAC project is to detect non-baryonic Dark Matter with a directional TPC using a high precision Micromegas readout plane. We will describe in detail the recent developments done with bulk Micromegas detectors as well as the characterisation measurements performed in an Argon(95%)-Isobutane(5%) mixture. Track measurements with alpha particles will be shown., Comment: 12 pages, 12 figures

Published
2011
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12. MIMAC : A micro-tpc matrix for directional detection of dark matter

Author

Santos, D., Billard, J., Bosson, G., Bouly, J. L., Bourrion, O., Fourel, Ch., Grignon, C., Guillaudin, O., Mayet, F., Richer, J. P., Delbart, A., Ferrer, E., Giomataris, I., Iguaz, F. J., Mols, J. P., Golabek, C., and Lebreton, L.

Subjects
Astrophysics - Cosmology and Extragalactic Astrophysics
Abstract

Directional detection of non-baryonic Dark Matter is a promising search strategy for discriminating WIMP events from background. However, this strategy requires both a precise measurement of the energy down to a few keV and 3D reconstruction of tracks down to a few mm. To achieve this goal, the MIMAC project has been developed. It is based on a gaseous micro-TPC matrix, filled with CF4 and CHF3. The first results on low energy nuclear recoils (H, F) obtained with a low mono-energetic neutron field are presented. The discovery potential of this search strategy is discussed and illustrated by a realistic case accessible to MIMAC., Comment: 6 pages, Proc. of the fifth international symposium on large TPCs for low energy rare event detection, Paris, France, Dec. 2010. To appear in Journal of Physics

Published
2011
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13. MIMAC : A micro-tpc matrix for directional detection of dark matter

Author

Santos, D., Billard, J., Bosson, G., Bourrion, O., Grignon, C., Guillaudin, O., Mayet, F., Richer, J. P., Ferrer, E., Giomataris, I., Iguaz, F. J., Mols, J. P., Allaoua, A., Golabek, C., and Lebreton, L.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

Directional detection of non-baryonic Dark Matter is a promising search strategy for discriminating WIMP events from background. However, this strategy requires both a precise measurement of the energy down to a few keV and 3D reconstruction of tracks down to a few mm. To achieve this goal, the MIMAC project has been developed. It is based on a gaseous micro-TPC matrix, filled with 3He, CF4 and/or C4H10. The first results on low energy nuclear recoils (1H and 19F) obtained with a low mono-energetic neutron field are presented. The discovery potential of this search strategy is discussed and illustrated by a realistic case accessible to MIMAC., Comment: Proceedings of Identification of Dark Matter 2010-IDM2010 conference

Published
2010

14. Isotopic Distributions of Fission Fragments from Transfer-induced Fission

Author

Rodríguez-Tajes, C., Caamaño, M., Delaune, O., Farget, F., Audouin, L., Bacri, C.-O., Benlliure, J., Casarejos, E., Clement, E., Cortina, D., Derkx, X., Dijon, A., Doré, D., Fernández-Domínguez, B., Gaudefroy, L., Golabek, C., Heinz, A., Jurado, B., Lemasson, A., Navin, A., Paradela, C., Ramos, D., Roger, T., Salsac, M.D., Schmitt, C., Schmidt, K.-H., Shrivastava, A., and Taieb, J.

Published
2013
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17. Erratum: Isotopic yield distributions of transfer- and fusion-induced fission from 238U + 12C reactions in inverse kinematics [Phys. Rev. C 88, 024605 (2013)]

Author

Caamano, M., Delaune, O., Farget, F., Derkx, X., Schmidt, K.-H., Audouin, L., Bacri, C.-O., Barreau, G., Benlliure, J., Casarejos, E., Chbihi, A., Fernandez-Domınguez, B., Gaudefroy, L., Golabek, C., Jurado, B., Lemasson, A., Navin, A., Rejmund, M., Roger, T., Shrivastava, A., Schmitt, C., 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), 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), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-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), 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)-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
25.70.Jj, 24.50.+g, 25.85.Ge, 29.85.−c, 99.10.Cd, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

Erratum

Published
2014
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18. A ��-TPC detector for the characterization of low energy neutron fields

Author

Golabek, C., Billard, J., Allaoua, A., Bosson, G., Bourrion, O., Grignon, C., Guillaudin, O., Lebreton, L., Mayet, F., Petit, M., Richer, J. -P., and Santos, D.

Subjects
Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Nuclear Experiment
Abstract

The AMANDE facility produces monoenergetic neutron fields from 2 keV to 20 MeV for metrological purposes. To be considered as a reference facility, fluence and energy distributions of neutron fields have to be determined by primary measurement standards. For this purpose, a micro Time Projection Chamber is being developed to be dedicated to measure neutron fields with energy ranging from 8 keV up to 1 MeV. In this work we present simulations showing that such a detector, which allows the measurement of the ionization energy and the 3D reconstruction of the recoil nucleus, provides the determination of neutron energy and fluence of these neutron fields.

Published
2012
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19. Actinide collisions for QED and superheavy elements with the time-dependent Hartree-Fock theory and the Balian-V��n��roni variational principle

Author

Simenel, C��dric, Golabek, C��dric, and Kedziora, David J.

Subjects
Nuclear Theory (nucl-th), Nuclear Theory, FOS: Physical sciences, Nuclear Experiment
Abstract

Collisions of actinide nuclei form, during very short times of few zs ($10^{-21}$ s), the heaviest ensembles of interacting nucleons available on Earth. Such collisions are used to produce super-strong electric fields by the huge number of interacting protons to test spontaneous positron-electron pair emission (vacuum decay) predicted by the quantum electrodynamics (QED) theory. Multi-nucleon transfer in actinide collisions could also be used as an alternative way to fusion in order to produce neutron-rich heavy and superheavy elements thanks to inverse quasifission mechanisms. Actinide collisions are studied in a dynamical quantum microscopic approach. The three-dimensional time-dependent Hartree-Fock (TDHF) code {\textsc{tdhf3d}} is used with a full Skyrme energy density functional to investigate the time evolution of expectation values of one-body operators, such as fragment position and particle number. This code is also used to compute the dispersion of the particle numbers (e.g., widths of fragment mass and charge distributions) from TDHF transfer probabilities, on the one hand, and using the Balian-Veneroni variational principle, on the other hand. A first application to test QED is discussed. Collision times in $^{238}$U+$^{238}$U are computed to determine the optimum energy for the observation of the vacuum decay. It is shown that the initial orientation strongly affects the collision times and reaction mechanism. The highest collision times predicted by TDHF in this reaction are of the order of $\sim4$ zs at a center of mass energy of 1200 MeV. According to modern calculations based on the Dirac equation, the collision times at $E_{cm}>1$ GeV are sufficient to allow spontaneous electron-positron pair emission from QED vacuum decay, in case of bare uranium ion collision. A second application of actinide collisions to produce neutron-rich transfermiums is discussed. A new inverse quasifission mechanism associated to a specific orientation of the nuclei is proposed to produce transfermium nuclei ($Z>100$) in the collision of prolate deformed actinides such as $^{232}$Th+$^{250}$Cf. The collision of the tip of one nucleus with the side of the other results in a nucleon flux toward the latter. The probability distributions for transfermium production in such a collision are computed. The produced nuclei are more neutron-rich than those formed in fusion reactions, thus, leading to more stable isotopes closer to the predicted superheavy island of stability. In addition to mass and charge dispersion, the Balian-Veneroni variational principle is used to compute correlations between $Z$ and $N$ distributions, which are zero in standard TDHF calculations., Proceeding of the FUSION11 conference

Published
2011
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20. Study of $^{124}$Sn+$^{136}$Xe fusion-evaporation: analysis of a rare-event experiment

Author

Avez, B., Drouart, Antoine, Stodel, C., Simenel, C., Alcantara-Nunez, J.A., Adamczyk, M., Banka, P., Bonnet, Eric, Clément, E., Dayras, R., Force, C., Golabek, C., Gonciarz, A., Grévy, S., Hauschild, K., Jacquet, D., Korichi, A., Kozik, T., Lazko, P., Morjean, M., Popeko, A., Roger, T., Saint-Laurent, M.G., Sosin, Z., Sulignano, B., Theisen, C., Wieloch, A., Yeremin, A., Yilmaz, B., Zielinska, M., 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), Smoluchowski Institute of Physics, Uniwersytet Jagielloński w Krakowie = Jagiellonian University (UJ), 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), Institut de Physique Nucléaire d'Orsay (IPNO), Flerov Laboratory of Nuclear Reactions [Dubna] (FLNR), Joint Institute for Nuclear Research (JINR), Physics Department, Ankara University, Ankara University, Heavy Ion Laboratory, University of Warsaw (UW), 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
fusion-evaporation, Superheavy elements, FOS: Physical sciences, 25.70.Jj, 23.60.+e, 25.85.Ca, 29.85.Fj, 27.90.+b, Statistical data analysis, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

Fusion-evaporation in the $^{124}$Sn+$^{136}$Xe system is studied using a high intensity xenon beam provided by the Ganil accelerator and the LISE3 wien filter for the selection of the products. Due to the mass symmetry of the entrance system, the rejection of the beam by the spectrometer was of the order of $5times10^8$. We have thus performed a detailed statistical analysis to estimate random events and to infer the fusion-evaporation cross sections. No signicant decay events were detected and upper limit cross sections of 172 pb, 87 pb and 235 pb were deduced for the synthesis of $^{257}$Rf, $^{258}$Rf and $^{259}$Rf, respectively., Comment: 7 pages, 4 figures

Published
2011

21. Characterization of the scission point from fission-fragment velocities

Author

Caamaño, M., primary, Farget, F., additional, Delaune, O., additional, Schmidt, K.-H., additional, Schmitt, C., additional, Audouin, L., additional, Bacri, C.-O., additional, Benlliure, J., additional, Casarejos, E., additional, Derkx, X., additional, Fernández-Domínguez, B., additional, Gaudefroy, L., additional, Golabek, C., additional, Jurado, B., additional, Lemasson, A., additional, Ramos, D., additional, Rodríguez-Tajes, C., additional, Roger, T., additional, and Shrivastava, A., additional

Published
2015
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22. Di-nuclear system studies at Coulomb barrier energies

Author

Heinz, S., Comas, V., Hofmann, S., Golabek, C., Mittig, W., Rejmund, F., Villari, A.C.C., Ackermann, D., Heredia, J., Hessberger, F.P., Khuyagbaatar, J., Kindler, B., Lommel, B., Mann, R., 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), 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 Lion, Michel

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2009

23. Search for a long-lived di-nuclear system in U+U reactions near the Coulomb barrier

Author

Golabek, C., Heinz, S., Mittig, W., Rejmund, F., Villari, A.C.C., Bhattacharyya, S., Boilley, D., de France, G., Drouart, A., Gaudefroy, L., Giot, Lydie, Marchix, A., Maslov, V., Morjean, M., Mukherjee, G., Navin, A., Penionzkevich, Yu., Rejmund, M., Roussel-Chomaz, P., Stodel, C., Winkler, M., 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), Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Université de Caen Normandie (UNICAEN), Normandie Université (NU), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire SUBATECH Nantes (SUBATECH), 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), Flerov Laboratory of Nuclear Reactions [Dubna] (FLNR), Joint Institute for Nuclear Research (JINR), F. Cerutti, A. Ferrari, 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 de Nantes (UN)-Mines Nantes (Mines Nantes), and Lion, Michel

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], XX
Abstract

CERN-Proceedings-2010-001 available at http://www.fluka.org/Varenna2009/procmat.htm; International audience; A search for long-living di-nuclear systems, which are transiently created during 238U+238U collisionsat beam energies between 6.09A and 7.35A MeV, has been performed at GANIL using thespectrometer VAMOS.

Published
2009

24. Isotopic Resolution of Fission Fragments from 238U+12C Transfer and Fusion Reactions

Author

Caamano, M., Rejmund, F., Xavier Derkx, H Schmidt, K., Andouin, L., O Bacri, C., Barreau, G., Benlliure, J., Casarejos, E., Fernández-Domínguez, B., Gaudefroy, L., Golabek, C., Jurado, B., Lemasson, A., Navin, A., Rejmund, M., Roger, T., Shrivastava, A., Schmitt, C., Taieb, J., 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), Universidade de Santiago de Compostela [Spain] (USC ), 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), 15-22, 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), USC, Universidad de Santiago de Compostela, and Universidad Santiago de Compostela

Subjects
transfer-induced fission, Nuclear Theory, fragment identification, inverse kinematics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, 24.75.+i,24.87.+y,25.70.Jj,25.70.Hi, neutron-rich actinides
Abstract

Expérience GANIL; International audience; Recent results from an experiment at GANIL, performed to investigate the main properties of fission-fragment yields and energy distributions in different fissioning nuclei as a function of the excitation energy, in a neutron-rich region of actinides, are presented. Transfer reactions in inverse kinematics between a 238U beam and a 12C target produced different actinides, within a range of excitation energy below 30 MeV. These fissioning nuclei are identified by detecting the target-like recoil, and their kinetic and excitation energy are determined from the reconstruction of the transfer reaction. The large-acceptance spectrometer VAMOS was used to identify the mass, atomic number and charge state of the fission fragments in flight. As a result, the characteristics of the fission-fragment isotopic distributions of a variety of neutron-rich actinides are observed for the first time over the complete range of fission fragments.

Published
2009

25. Isotopic production rate in minor actinide fission

Author

Derkx, X., Rejmund, F., Caamano, M., Barreau, G., Jurado, B., Schmidt, K.-H., Navin, A., Fernandez, B., Gaudefroy, L., Rejmund, M., Schmitt, C., Audouin, L., Bacri, C.O., Benlliure, J., Casarejos, E., Doré, D., Golabek, C., Lemasson, A., Panebianco, S., Ridikas, D., Taieb, 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), 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), 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), 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), 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)-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), 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), 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
2008

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

Author

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

Published
2014
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27. Isotopic yield distributions of transfer- and fusion-induced fission from238U+12C reactions in inverse kinematics

Author

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

Published
2013
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28. Isotopic fission fragment distributions as a deep probe to fusion-fission dynamics

Author

Farget, F, primary, Caamaño, M, additional, Delaune, O, additional, Tarasov, O B, additional, Derkx, X, additional, Schmidt, K-H, additional, Amthor, A M, additional, Audouin, L, additional, Bacri, C-O, additional, Barreau, G, additional, Bastin, B, additional, Bazin, D, additional, Blank, B, additional, Benlliure, J, additional, Cacéres, L, additional, Casarejos, E, additional, Chbihi, A, additional, Fernàndez-Dominguez, B, additional, Gaudefroy, L, additional, Golabek, C, additional, Grévy, S, additional, Jurado, B, additional, Kamalou, O, additional, Lemasson, A, additional, Lukyanov, S, additional, Mittig, W, additional, Morrissey, D J, additional, Navin, A, additional, Pereira, J, additional, Perrot, L, additional, Rejmund, M, additional, Roger, T, additional, Saint-Laurent, M-G, additional, Savajols, H, additional, Schmitt, C, additional, Sherill, B M, additional, Stodel, C, additional, Taieb, J, additional, Thomas, J-C, additional, and Villari, A C, additional

Published
2013
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29. A detector for the characterization of low energy neutron fields

Author

Golabek, C., primary, Billard, J., additional, Allaoua, A., additional, Bosson, G., additional, Bourrion, O., additional, Grignon, C., additional, Guillaudin, O., additional, Lebreton, L., additional, Mayet, F., additional, Petit, M., additional, Richer, J.-P., additional, and Santos, D., additional

Published
2012
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31. MIMAC : A micro-tpc matrix for directional detection of dark matter

Author

Santos, D., primary, Billard, J., additional, Bosson, G., additional, Bouly, J.L., additional, Bourrion, O., additional, Fourel, Ch., additional, Guillaudin, O., additional, Mayet, F., additional, Richer, J.P., additional, Delbart, A., additional, Ferrer, E., additional, Giomataris, I., additional, Iguaz, F.J., additional, Mols, J.P., additional, Golabek, C., additional, and Lebreton, L., additional

Published
2012
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32. Micromegas detector developments for MIMAC

Author

Ferrer-Ribas, E., primary, Attié, D., additional, Calvet, D., additional, Colas, P., additional, Druillole, F., additional, Giomataris, Y., additional, Iguaz, F.J., additional, Mols, J.P., additional, Pancin, J., additional, Papaevangelou, T., additional, Billard, J., additional, Bosson, G., additional, Bouly, J.L., additional, Bourrion, O., additional, Fourel, Ch., additional, Grignon, C., additional, Guillaudin, O., additional, Mayet, F., additional, Richer, J.P., additional, Santos, D., additional, Golabek, C., additional, and Lebreton, L., additional

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

Author

Delaune, O., primary, Caamaño, M., additional, Derkx, X., additional, Farget, F., additional, Schmidt, K.-H, additional, Tarasov, O.B., additional, Audouin, L., additional, Amthor, A.M., additional, Bacri, C.-O., additional, Barreau, G., additional, Bastin, B., additional, Bazin, D., additional, Benlliure, J., additional, Blank, B., additional, Cacères, L., additional, Casarejos, E., additional, Fernández-Domínguez, B., additional, Gaudefroy, L., additional, Golabek, C., additional, Grévy, S., additional, Jurado, B., additional, Kamalou, O., additional, Lemasson, A., additional, Lukyanov, S.M., additional, Mittig, W., additional, Morrissey, D.J., additional, Navin, A., additional, Pereira, J., additional, Perrot, L., additional, Rejmund, M., additional, Roger, T., additional, Saint-Laurent, M.G., additional, Savajols, H., additional, Schmitt, C., additional, Sherrill, B.M., additional, Stodel, C., additional, Taieb, J., additional, Thomas, J.C., additional, and Villari, A.C.C., additional

Published
2012
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34. MIMAC: A micro-tpc matrix for directional detection of dark matter

Author

Santos, D, primary, Billard, J, additional, Bosson, G, additional, Bouly, J L, additional, Bourrion, O, additional, Fourel, Ch, additional, Grignon, C, additional, Guillaudin, O, additional, Mayet, F, additional, Richer, J P, additional, Delbart, A, additional, Ferrer, E, additional, Giomataris, I, additional, Iguaz, F J, additional, Mols, J P, additional, Golabek, C, additional, and Lebreton, L, additional

Published
2011
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35. Micromegas detector developments for Dark Matter directional detection with MIMAC

Author

Iguaz, F J, primary, Attié, D, additional, Calvet, D, additional, Colas, P, additional, Druillole, F, additional, Ferrer-Ribas, E, additional, Giomataris, I, additional, Mols, J P, additional, Pancin, J, additional, Papaevangelou, T, additional, Billard, J, additional, Bosson, G, additional, Bouly, J L, additional, Bourrion, O, additional, Fourel, Ch, additional, Grignon, C, additional, Guillaudin, O, additional, Mayet, F, additional, Richer, J P, additional, Santos, D, additional, Golabek, C, additional, and Lebreton, L, additional

Published
2011
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37. Study of heavy di-nuclear systems

Author

Heinz, S., primary, Comas, V., additional, Hofmann, S., additional, Ackermann, D., additional, Heredia, J., additional, Heßberger, F.P., additional, Khuyagbaatar, J., additional, Kindler, B., additional, Lommel, B., additional, Mann, R., additional, Golabek, C., additional, Mittig, W., additional, Rejmund, F., additional, and Villari, A.C.C., additional

Published
2010
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38. Minor actinide fission induced by multi-nucleon transfer reaction in inverse kinematics

Author

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

Published
2010
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39. Promptγ-ray spectroscopy of isotopically identified fission fragments

Author

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

Published
2009
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40. Isotopic resolution of fission fragments from [sup 238]U+[sup 12]C transfer and fusion reactions

Author

Caamaño, M., primary, Rejmund, F., additional, Derkx, X., additional, Schmidt, K.-H., additional, Andouin, L., additional, Bacri, C.-O., additional, Barreau, G., additional, Benlliure, J., additional, Casarejos, E., additional, Fernández-Domínguez, B., additional, Gaudefroy, L., additional, Golabek, C., additional, Jurado, B., additional, Lemasson, A., additional, Navin, A., additional, Rejmund, M., additional, Roger, T., additional, Shrivastava, A., additional, Schmitt, C., additional, Taieb, J., additional, Chatillon, Audrey, additional, Faust, Herbert, additional, Fioni, Gabriele, additional, Goutte, Dominique, additional, and Goutte, Héloise, additional

Published
2009
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41. SEARCH FOR A LONG LIVING GIANT SYSTEM IN 238U+238U COLLISIONS NEAR THE COULOMB BARRIER

Author

GOLABEK, C., primary, VILLARI, A. C. C., additional, HEINZ, S., additional, MITTIG, W., additional, BHATTACHARYYA, S., additional, BOILLEY, D., additional, DE FRANCE, G., additional, DROUART, A., additional, GAUDEFROY, L., additional, GIOT, L., additional, MARCHIX, A., additional, MASLOV, V., additional, MORJEAN, M., additional, MUKHERJEE, G., additional, NAVIN, A., additional, PENIONZKEVICH, YU., additional, REJMUND, F., additional, REJMUND, M., additional, ROUSSEL-CHOMAZ, P., additional, and STODEL, C., additional

Published
2008
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42. Search for a long lived component in the reaction U+U near the Coulomb barrier

Author

Villari, A. C. C., primary, Golabek, C., additional, Mittig, W., additional, Heinz, S., additional, Bhattacharyya, S., additional, Boilley, D., additional, Dayras, R., additional, De France, G., additional, Drouart, A., additional, Gaudefroy, L., additional, Giot, L., additional, Marchix, A., additional, Maslov, V., additional, Morjean, M., additional, Mukherjee, G., additional, Navin, A., additional, Penionzkevich, Yu., additional, Rejmund, F., additional, Rejmund, M., additional, Roussel-Chomaz, P., additional, Stodel, C., additional, and Winkler, M., additional

Published
2007
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43. Characterization of Monoenergetic Low Energy Neutron Fields with the μTPC Detector.

Author

Golabek, C., Billard, J., Grignon, C., Bosson, G., Bourrion, O., Guillaudin, O., Lebreton, L., Mayet, F., Petit, M., Richer, J.-P., and Santos, D.

Subjects
*NEUTRON counters, *NEUTRON measurement, *TIME projection chambers (Nuclear physics), *DISTRIBUTION (Probability theory), *SIMULATION methods & models, *NEUTRONS
Abstract

The AMANDE facility produces monoenergetic neutron fields from 2 keV to 20 MeV for metrological purposes. To be considered as a reference facility, fluence and energy distributions of neutron fields have to be determined by primary measurement standards. For this purpose, a micro Time Projection Chamber is being developed to be dedicated to measure neutron fields with energy ranging from 2 keV up to 1 MeV. We present simulations showing that such a detector, which allows the measurement of the ionization energy and the 3D reconstruction of the recoil nucleus, provides the determination of neutron energy and fluence of such low energy neutron fields. [ABSTRACT FROM AUTHOR]

Published
2011
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44. Isotopic resolution of fission fragments from 238U+12C transfer and fusion reactions.

Author

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

Subjects
NUCLEAR fission, CONTROLLED fusion, PARTICLES (Nuclear physics), NUCLEAR physics, NUCLEAR energy
Abstract

Recent results from an experiment at GANIL, performed to investigate the main properties of fission-fragment yields and energy distributions in different fissioning nuclei as a function of the excitation energy, in a neutron-rich region of actinides, are presented. Transfer reactions in inverse kinematics between a 238U beam and a 12C target produced different actinides, within a range of excitation energy below 30 MeV. These fissioning nuclei are identified by detecting the target-like recoil, and their kinetic and excitation energy are determined from the reconstruction of the transfer reaction. The large-acceptance spectrometer VAMOS was used to identify the mass, atomic number and charge state of the fission fragments in flight. As a result, the characteristics of the fission-fragment isotopic distributions of a variety of neutron-rich actinides are observed for the first time over the complete range of fission fragments. [ABSTRACT FROM AUTHOR]

Published
2009
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45. PRODUCTION AND MEASUREMENT OF NEUTRON REFERENCE FIELDS: THE AMANDE FACILITY AND MIMAC PROTOTYPE AS NEUTRON DETECTION SYSTEM.

Author

Golabek, C., Billard, J., Grignon, C., Bosson, G., Bourrion, O., Guillaudin, O., Lebreton, L., Mayet, F., Petit, M., Richer, J.-P., Santos, D., and Valdenaire, S.

Subjects
*NEUTRON counters, *DARK matter, *TIME projection chambers (Nuclear physics), *LOW pressure (Science), *INTERSTELLAR medium
Abstract

The AMANDE facility produces mono-energetic neutron fields from 2 keV to 20 MeV with a metrological quality (Gressier et al. 2004). To be considered as a standard facility, fluence and energy distributions of neutron fields have to be mastered, i.e. measured by primary detector standards. For this purpose, a new gaseous Time Projection Chamber (μTPC) is being developed within the MIMAC project devoted to directional Dark Matter search (Billard et al. 2010). The μTPC is dedicated to measure neutron fields from 2 keV up to 1 MeV. The measurement strategy requires track reconstruction of recoiling nuclei down to a few keV, which can be achieved with low pressure gaseous detectors. Hence the energy must be measured precisely and the track of the recoiling nucleus must be 3D reconstructed. This is achieved with a low pressure micropattern gaseous detector (a pixelized bulk micromegas) equipped with a self triggered electronics able to perform the anode sampling at a 50 MHz frequency. Methods to measure fluence and neutron energy with the TPC have been described. [ABSTRACT FROM AUTHOR]

Published
2011
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46. Investigation of deep inelastic reactions in 238U + 238U at Coulomb barrier energies.

Author

Golabek, C., Heinz, S., Mittig, W., Rejmund, F., Villari, A. C. C., Bhattacharyva, S., Boilley, D., De France, G., Drouart, A., Gaudefroy, L., Giot, L., Maslov, V., Morjean, M., De Mukherjee, G., Penionzkevich, Yu., Roussel-Chomaz, P., and Stodel, C.

Subjects
*NUCLEAR physics, *BARYONS, *PROTONS, *NEUTRONS, *COULOMB functions
Abstract

We investigated deep inelastic reactions in 238U + 238U collisions at 6.09, 6.49, 6.91, 7.1 and 7.35× A MeV at the VAMOS spectrometer (GANIL). A large transfer of neutrons and protons was observed at all beam energies. For a transfer of more than 10 nucleons the total kinetic energy of the detected fragments becomes independent of the beam energy and reaches values far below the Coulomb barrier for spherical fragments. This points to the formation of a di-nuclear system in the entrance channel which develops an elongated shape and a strong neck. For such reactions we expect an enhanced lifetime of the di-nuclear system which is significantly longer than the time scale for elastic and quasi-elastic reactions. Different theoretical approaches predict delay times of more than 5×10-21 s for a subset of our data. [ABSTRACT FROM AUTHOR]

Published
2010
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47. SEARCH FOR A LONG LIVING GIANT SYSTEM IN 238U+238U COLLISIONS NEAR THE COULOMB BARRIER.

Author

GOLABEK, C., VILLARI, A. C. C., HEINZ, S., MITTIG, W., BHATTACHARYYA, S., BOILLEY, D., DE FRANCE, G., DROUART, A., GAUDEFROY, L., GIOT, L., MARCHIX, A., MASLOV, V., MORJEAN, M., MUKHERJEE, G., NAVIN, A., PENIONZKEVICH, YU., REJMUND, F., REJMUND, M., ROUSSEL-CHOMAZ, P., and STODEL, C.

Subjects
*COLLISIONS (Physics), *SPECTROMETERS, *KINEMATICS, *PARTICLES (Nuclear physics), *ENERGY dissipation
Abstract

We searched for a long-living component in the collision of 238U+238U between 6.09 A and 7.35 A MeV. The experiment was performed at GANIL using the spectrometer VAMOS, tuned for observing reactions with kinematics similar to quasi-fission events. Theoretical calculations indicate that reactions with strong energy dissipation and a large number of transferred nucleons are correlated to a time delay in the decay of the giant system. We detected events of such type in the focal plane of VAMOS. These events present an excitation function increasing with bombarding energy. [ABSTRACT FROM AUTHOR]

Published
2008
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48. Fission studies at VAMOS

Author

Fanny Farget, Caamano, M., Ramos, D., Rodriguez-Tajes, C., H Schmidt, K., Audouin, L., Benlliure, J., Casarejos, E., Clément, E., Cortina, D., Delaune, O., Derkx, X., Dijon, A., Doré, D., Fernandez-Dominguez, B., Gaudefroy, L., Golabek, C., Heinz, A., Jurado, B., Lemasson, A., Paradela, C., Roger, T., Salsac, M. D., Schmitt, C., 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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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 (UB)-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)-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 Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

International audience; Inverse kinematics is a new tool to study nuclear fission. Its main advantage isthe possibility to measure with an unmatched resolution the atomic number of fissionfragments, leading to new observables in the properties of fission-fragmentdistributions. In addition to the resolution improvement, the study of fission based onnuclear collisions in inverse kinematics beneficiates from a larger view with respect tothe neutron-induced fission, as in a single experiment the number of fissioningsystems and the excitation energy range are widden. With the use of spectrometers,mass and kinetic-energy distributions may now be investigated as a function of theproton and neutron number sharing. The production of fissioning nuclei in transferreactions allows studying the isotopic yields of fission fragments as a function of theexcitation energy. With the access of kinematics properties, the charge polarisation offragments at scission is now revealed with high precision, and it is shown that itcannot be neglected, even at higher excitation energies. Results on fissioning systems238U, 239Np, 240Pu, 244Cm, obtained in transfer reactions are presented, together withthe fusion reaction leading to the compound nucleus 250Cf at an excitation energy of45MeV.

49. Evolution of isotopic fission-fragment yields with bombarding energy

Author

Delaune, O., Caamano, M., Farget, F., Tarasov, O. B., Derkx, X., Schmidt, K. -H, Audouin, L., Amthor, A. M., Bacri, C. -O, Barreau, G., Bastin, B., Bazin, D., Benlliure, J., Blank, B., Cacères, L., Casarejos, E., Fernández-Domínguez, B., Gaudefroy, L., Golabek, C., Grévy, S., Jurado, B., Kamalou, O., Lemasson, A., Lukyanov, S. M., Mittig, W., Morrissey, D. J., Navin, A., Pereira, J., Perrot, L., Rejmund, M., Roger, T., Saint-Laurent, M. G., savajols hervé, Schmitt, C., Sherrill, B. M., Stodel, C., Taieb, J., Thomas, J. C., Villari, A. C. C., 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), 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), PANTECHNIK S.A., Pantechnik, Francesco Cerutti, Mark Chadwick, Alfredo Ferrari, Toshihiko Kawano, Simone Bottoni, Luna Pellegri, 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)-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
Nuclear Theory, Nuclear Physics - Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

Expérience GANIL/LISE/VAMOS; 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 240 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.

50. Erratum: Isotopic yield distributions of transfer- and fusion-induced fission from 238U + 12C reactions in inverse kinematics [Phys. Rev. C 88,024605 (2013)].

Author

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

Subjects
*ISOTOPES, *KINEMATICS
Abstract

A correction to the article "Isotopic yield distributions of transfer- and fusion-induced fission from 238U + 12C reactions in inverse kinematics" that was published in a 2013 issue is presented.

Published
2014
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