Search

Your search keyword '"J., Benlliure"' showing total 155 results
Start Over Author "J., Benlliure" Topic 0103 physical sciences
155 results on '"J., Benlliure"'

1. Fission-fragment yields and prompt-neutron multiplicity for Coulomb-induced fission of U234,235 and Np237,238

Author

S. Pietri, J. Benlliure, A. Chatillon, G. Boutoux, A. Kelic-Heil, D. M. Rossi, B. Jurado, F. Farget, A. Prochazka, C. Nociforo, J. F. Martin, E. Casarejos, Bernd Voss, B. Laurent, H. Alvarez-Pol, M. Caamaño, T. Gorbinet, Y. Ayyad, G. Belier, L. Grente, J. Vargas, D. Cortina-Gil, E. Pellereau, C. Paradela, A. Ebran, B. Fernández-Domínguez, L. Tassan-Got, Helmut Weick, L. Audouin, Andreas Martin Heinz, Håkan Johansson, N. Kurz, J. L. Rodriguez-Sanchez, J. Taieb, and Herbert A. Simon

Subjects
Physics, Proton, 010308 nuclear & particles physics, Fission, Nuclear Theory, 01 natural sciences, Nuclear physics, medicine.anatomical_structure, Prompt neutron, 0103 physical sciences, medicine, Neutron, Atomic number, Multiplicity (chemistry), Nuclear Experiment, 010306 general physics, Nucleus, Excitation
Abstract

Low-energy fission of and radioactive beams, provided by the Fragment Separator (FRS) of the GSI Helmholtzzentrum fur Schwerionenforschung facility (GSI), has been studied using the Reactions with Relativistic Radioactive Beams / Studies on Fission with Aladin (R3B/SOFIA) setup. The latter allows us, on an event-by-event basis, to simultaneously identify, in terms of their mass and atomic numbers, the fissioning nucleus in coincidence with both fission fragments after prompt-neutron emission. This article reports new results on elemental, isotonic, isobaric, and isotopic yields. Moreover, the high accuracy of our data allowed us to study in detail proton even-odd staggering, from elemental yields; neutron excess, from isotopic yields; and total prompt-neutron multiplicity, from the difference of masses of the fissioning nucleus and fission fragments. These results are then compared to previous experimental data in order to probe how these fission observables change as function of the excitation energy and atomic and neutron numbers of the compound nucleus.

Published
2021

2. Simulations of light collection in long tapered CsI(Tl) scintillators using real crystal surface data and comparisons to measurement

Author

B. Heiss, D. González, Rainer Timm, G. Rondeau, Håkan T Johansson, P. Cabanelas, Pavel Golubev, R. Gernhäuser, Andreas Martin Heinz, Ángel Perea, Enrique Casarejos, P. Díaz Fernández, T. Kröll, M. Feijoo, E. Galiana, Z. Ren, H. Alvarez-Pol, Olof Tengblad, L. Ponnath, H. B. Rhee, P. Teubig, A.-L. Hartig, Joakim Cederkäll, P. Klenze, Daniel Galaviz, J. Benlliure, A. Knyazev, J. L. Rodriguez-Sanchez, L. Causeret, Ivan G. Scheblykin, D. Cortina-Gil, Joochun Park, Swedish Research Council, Federal Ministry of Education and Research (Germany), Technische Universität Darmstadt, Helmholtz International Center for FAIR, Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), and Xunta de Galicia

Subjects
Nuclear and High Energy Physics, Photon, 3313 Tecnología E Ingeniería Mecánicas, Physics::Optics, Scintillator, 01 natural sciences, 030218 nuclear medicine & medical imaging, Surface topography, Crystal, 03 medical and health sciences, Calorimeters, 0302 clinical medicine, Optics, 0103 physical sciences, Specular reflection, Instrumentation, Physics, Scintillation, 2209.11 Luz, Interaction point, 010308 nuclear & particles physics, business.industry, Scattering, Attenuation length, 3312 Tecnología de Materiales, ddc, Scintillators, Absorption length, business, Simulation of light transport
Abstract

10 pags., 9 figs., 2 tabs., Simulation results for light transport in long tapered CsI(Tl) crystals using look-up tables (LUTs) are presented. The LUTs were derived from the topography of a polished and a lapped surface of a CsI(Tl) crystal measured with atomic force microscopy. Simulations with different combinations of polished and lapped surfaces were performed, to extract the non-uniformity of light collection depending on the interaction point, and compared to experimental results. The simulations reproduce the general trend given by the measurements, and show that more homogeneous light collection is attained when all lateral sides of the crystal are lapped. For the lapped crystal the simulation model is most sensitive to the reflectivity of the enhanced specular reflector (ESR) foil surrounding the crystal, which is one of several properties influencing the light transport examined in this study. The sensitivity of the light-output non-uniformity to variations in the absorption length observed in a batch of CsI(Tl) crystals in a previous study is also discussed. Residual differences between the simulation and the measurements can potentially be attributed to the scattering of scintillation photons inside the materials used. Additional measurements to further advance the construction of the simulation model are suggested., This work was supported by the Swedish research council (VR) grants 2017-03986, 2014-06644, 2013-04178, 2012-04550, BMBF contracts 05P15WOFNA, 05P19WOFN1, 05P15RDFN1, 05P19RDFN1, the TU Darmstadt – GSI cooperation contract HIC for FAIR, by the Spanish research council grants FPA02015-64969-P (MINDECO/FEDER/EU), FPA2015-69640-C2-1-P, PGC2018-099746-B-C21, MDM-2016.0692 (MINECO/FEDER/EU) and by ED431C-2017/54 and EDB481-2017/002 (Xunta de Galicia/FEDER/EU).

Published
2021

3. Validation of the radiation shielding for the Laser Laboratory for Acceleration and Applications

Author

J.J. Llerena, Camilo Ruiz, J. Benlliure, and D. Cortina-Gil

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Nuclear engineering, Monte Carlo method, Plasma, Electron, Radiation, Laser, 01 natural sciences, law.invention, Acceleration, law, 0103 physical sciences, Physics::Accelerator Physics, Neutron, Laser power scaling, 010306 general physics, Instrumentation
Abstract

The Laser Laboratory for Acceleration and Applications (L2A2) is a new facility, recently built at the University of Santiago de Compostela in Spain, to investigate laser–plasma acceleration technologies. This facility is equipped with a 50 TW laser system and a radio-protected area where different laser–plasma induced radiation sources are being implemented. In this paper we use Monte Carlo radiation transport simulations based on the code Fluka to validate the radiation shielding installed at L2A2 for proton, neutron and electron sources generated with the present laser system, but also for future possible upgrades increasing the laser power to 100 and 200 TW. Particular attention is paid to the determination of the radiation source term describing the acceleration of electrons, protons and neutrons using over-dense and under-dense plasmas.

Published
2019

4. Manifestation of the Berry phase in the atomic nucleus 213Pb

Author

S. Klupp, A. Algora, Roberto Menegazzo, D. Mengoni, F. Naqvi, J. J. Valiente-Dobón, S. Pietri, T. Habermann, J. Benlliure, Branislav Sitar, Alison Bruce, A. Bracco, P. Van Isacker, N. Kurz, Andrea Corsi, E. Sahin, Dirk Rudolph, Imrich Szarka, Helmut Weick, Zs. Podolyák, J. Gerl, J. Grebosz, Davinder Siwal, S. K. Mandal, S. Leoni, T. Engert, D. Bazzacco, A. Prochazka, M. Górska, F. Recchia, S. Lunardi, D. R. Napoli, Hans Geissel, P. Boutachkov, A. Gottardo, F. Camera, Enrique Casarejos, I. Kojouharov, P. H. Regan, E. Gregor, Oliver Wieland, H. J. Wollersheim, A. Sharma, G. de Angelis, C. Nociforo, F. C. L. Crespi, A. Goasduff, C. Domingo-Pardo, A. I. Morales, M. Pfützner, B. Million, G. Benzoni, M. L. Cortés, Philip M Walker, C. A. Ur, Peter Strmen, H. Schaffner, A. Gadea, Maria Doncel, N. Goel, S. M. Lenzi, 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), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Nuclear and High Energy Physics, Angular momentum, nucl-th, Nuclear Theory, isomeric decays, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, 01 natural sciences, Nuclear Theory (nucl-th), 0103 physical sciences, Subatomic Physics, Nuclear Physics - Experiment, ddc:530, 22 Física, Nuclear Experiment (nucl-ex), 010306 general physics, Spectroscopy, Nuclear Experiment, Physics, Isotope, 010308 nuclear & particles physics, 2207 Física Atómica y Nuclear, Quantum number, lcsh:QC1-999, relativistic projectile fragmentation, ddc, Geometric phase, gamma-ray spectroscopy, Nuclear Physics - Theory, Atomic nucleus, Atomic number, Atomic physics, Nucleon, lcsh:Physics
Abstract

Physics letters / B 816, 136183 (2021). doi:10.1016/j.physletb.2021.136183, Published by North-Holland Publ., Amsterdam

Published
2021

5. Tl concentration and its variation in a CsI(Tl) crystal for the CALIFA detector

Author

Håkan T Johansson, D. Cortina-Gil, Pavel Golubev, B. Heiss, C. Gutierrez-Neira, M. J. G. Borge, Enrique Casarejos, A.-L. Hartig, R. Gernhäuser, Jan Pallon, A. Knyazev, José Antonio Briz, P. Díaz Fernández, Joakim Cederkäll, M. Feijoo, Joochun Park, P. Klenze, Thomas Nilsson, H. Alvarez-Pol, David Porrinas González, J. L. Rodriguez-Sanchez, L. Ponnath, P. Teubig, D. Galaviz, Andreas Martin Heinz, T. Kröll, Ángel Perea, P. Cabanelas, E. Galiana, H. B. Rhee, Olof Tengblad, J. Benlliure, Swedish Research Council, Federal Ministry of Education and Research (Germany), Consejo Superior de Investigaciones Científicas (España), Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), German Research Foundation, and Xunta de Galicia

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Dopant, 010308 nuclear & particles physics, Detector, Analytical chemistry, Calorimetry, Scintillator, 01 natural sciences, Collimated light, Calorimeter, Crystal, CsI(Tl) energy resolution, Calorimeters, Scintillators, 0103 physical sciences, Nuclear reactions, 010306 general physics, Instrumentation
Abstract

9 pags., 6 figs., One of the factors that can contribute to the resolution of long, doped inorganic scintillators used for nuclear spectroscopy is the variation of the dopant concentration over the length the detector crystal. In this work an investigation of such potential variations in one of the CsI(Tl) scintillators used in the calorimeter, CALIFA, of the RB experiment at FAIR, has been performed using particle induced X-ray emission. No statistically significant gradient in doping level was found along the long axis of the investigated sample crystal and the mean value of the Tl concentration was measured to be 0.0839(38)% by weight. This corresponds to a light output of 97.3 % relative to the maximum attainable light output according to previously published work. By taking the ±1σ bounds, the 3% statistical spread in the relative light output provides a good reference value of the minimum light-output non-uniformity observed for the CALIFA crystals. If the relative light output is estimated pointwise from a set of Tl concentration measurements a light-output non-uniformity of 4.6(2.4)% results. For a γ-ray energy of 662 keV the deduced variation in Tl concentration contributes with 0.48(6)% to the typical resolution of 7.74(6)% measured with a collimated source along the crystal main axis. The result is of interest for the characterization of the detector system performance and for realistic simulations of the light collection process in detector systems that are used for nuclear spectroscopy and calorimetry., This work was supported by the Swedish research council (VR) grants 2017-03986, 2014-06644, 2013-04178, 2012-04550, BMBF contracts 05P15WOFNA, 05P19WOFN1, 05P15RDFN1, 05P19RDFN1, the TU Darmstadt – GSI cooperation contract HIC for FAIR, by the Spanish National Research Council, Spain grants FPA02015-64969-P (MINDECO/FEDER/EU), FPA2015-69640-C2-1-P, PGC2018-099746-B-C21, MDM-2016.0692 (MINECO/FEDER/EU) and by GRC, Germany ED431C 2017/54 (Xunta de Galicia/FEDER/EU).

Published
2020

6. Evidence for a New Compact Symmetric Fission Mode in Light Thorium Isotopes

Author

Andreas Martin Heinz, M. Caamaño, Enrique Casarejos, A. Ebran, Yassid Ayyad, A. Chatillon, G. Boutoux, J. Taieb, J. Vargas, J. L. Rodriguez-Sanchez, T. Gorbinet, B. Laurent, F. Farget, A. Prochazka, S. Pietri, D. Cortina-Gil, C. Nociforo, C. Paradela, B. Fernández-Domínguez, E. Pellereau, L. Audouin, N. Kurz, Helmut Weick, Håkan T Johansson, L. Grente, Herbert A. Simon, J. Benlliure, H. Alvarez-Pol, D. M. Rossi, Bernd Voss, G. Belier, J. F. Martin, L. Tassan-Got, A. Kelic-Heil, Beatriz Jurado, Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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), 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), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and 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
Physics, Isotope, Fission, Nuclear Theory, General Physics and Astronomy, Thorium, chemistry.chemical_element, Actinide, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Effective nuclear charge, Physics::Geophysics, Nuclear physics, chemistry, 0103 physical sciences, Multiplicity (chemistry), 010306 general physics, Nuclear Experiment, Bond cleavage, Isotopes of thorium, Nuclear Physics
Abstract

International audience; Taking benefit of the R3B/SOFIA setup to measure the mass and the nuclear charge of both fission fragments in coincidence with the total prompt-neutron multiplicity, the scission configurations are inferred along the thorium chain, from the asymmetric fission in the heavier isotopes to the symmetric fission in the neutron-deficient thorium. Against all expectations, the symmetric scission in the light thorium isotopes shows a compact configuration, which is in total contrast to what is known in the fission of the heavier thorium isotopes and heavier actinides. This new main symmetric scission mode is characterized by a significant drop in deformation energy of the fission fragments of about 19 MeV, compared to the well-known symmetric scission in the uranium-plutonium region.

Published
2020

7. Structure of superheavy hydrogen 7H

Author

Naoyuki Itagaki, A. M. Moro, J. Gibelin, D. Cortina-Gil, C. Rodríguez Tajes, B. Fernández–Domínguez, G. F. Grinyer, F. Farget, D. Perez Loureiro, Riccardo Raabe, J. Pancin, J. Benlliure, S. Sambi, S. Bagchi, M. Caamaño, Bertrand Jacquot, T. Roger, Marine Vandebrouck, H. Savajols, B. Pietras, D. Ramos, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, 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), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de 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), Universidade de Santiago de Compostela [Spain] (USC ), 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), Universidad de Sevilla / University of Sevilla, KVI-CART, University of Groningen, University of Groningen [Groningen], Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Yukawa Institute for Theoretical Physics (YITP), Kyoto University, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, [PHYS]Physics [physics], Proton, Hydrogen, 010308 nuclear & particles physics, QC1-999, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, chemistry.chemical_element, Nuclear matter, 01 natural sciences, 7. Clean energy, Nuclear physics, chemistry, Pairing, 0103 physical sciences, Nuclear force, Neutron, Halo, 010306 general physics, Ground state, Nuclear Experiment
Abstract

The properties of nuclei with extreme neutron–to–proton ratios reveal the limitations of state-ofthe-art nuclear models and are key to understand nuclear forces. 7H, with six neutrons and a single proton, is the nuclear system with the most unbalanced neutron–to–proton ratio ever known, but its sheer existence and properties are still a challenge for experimental efforts and theoretical models. We report here the first measurement of the basic characteristics and structure of the ground state of 7H; they depict a system with a triton core surrounded by an extended four-neutron halo, built by neutron pairing, that decays through a unique four–neutron emission with a relatively long half-life. These properties are a prime example of new phenomena occurring in almost pure-neutron nuclear matter, beyond the binding limits of the nuclear landscape, that are yet to be described within our current models.

Published
2020

8. Study of Δ excitations in medium-mass nuclei with peripheral heavy ion charge-exchange reactions

Author

J. Atkinson, C. Scheidenberger, Enrique Casarejos, S. Pietri, D. Pérez-Loureiro, M. Caamaño, Yu. A. Litvinov, Helmut Weick, Thomas Aumann, A. Kelic-Heil, Yassid Ayyad, K. Boretzky, Isaac Vidaña, S. Beceiro-Novo, E. Haettner, Yasumoto Tanaka, J. S. Winfield, J. Vargas, D. Cortina-Gil, C. Paradela, J. L. Rodriguez-Sanchez, P. Díaz Fernández, A. Prochazka, H. Alvarez-Pol, J. Benlliure, M. Takechi, Hans Geissel, A. Estrade, and Horst Lenske

Subjects
Nuclear and High Energy Physics, Nuclear Theory, Proton, Baryon resonances, 01 natural sciences, Resonance (particle physics), Spectral line, Ion, Pion, 0103 physical sciences, ddc:530, Nuclear Experiment, 010306 general physics, Physics, 010308 nuclear & particles physics, lcsh:QC1-999, Fragment separator FRS, Inverse kinematics, Isobar, Isobaric process, Atomic physics, lcsh:Physics, Excitation
Abstract

Physics letters / B 807, 135565 (2020). doi:10.1016/j.physletb.2020.135565, Published by North-Holland Publ., Amsterdam

Published
2020

9. Probing the Z = 6 spin-orbit shell gap with (p,2p) quasi-free scattering reactions

Author

A. Henriques, J. S. Winfield, Thomas Nilsson, Rene Reifarth, M. Heine, E. Cravo, L. M. Fraile, Håkan T Johansson, O. Sorlin, L. Chulkov, W. N. Catford, A. Revel, J. Marganiec-Gałązka, Pavel Golubev, H. Scheit, S. Beceiro-Novo, Joakim Cederkäll, R. Gernhäuser, Carlos A. Bertulani, Y. Togano, T. Le Bleis, D. Cortina-Gil, L. Atar, G. L. Wilson, S. Pietri, F. Farinon, Kai Zuber, N. Kurz, Andreas Zilges, V. Volkov, M. Heil, C. Langer, A. Kelic-Heil, R. Plag, Catherine Rigollet, J. Enders, Iris Dillmann, U. Datta Pramanik, Jorge Machado, H. Alvarez-Pol, I. Syndikus, A. O. Macchiavelli, Marina Petri, D. Yakorev, M. Holl, Enrique Casarejos, G. Ribeiro, Mikhail V. Zhukov, Stefanos Paschalis, María José García Borge, Marine Vandebrouck, Deniz Savran, V. Panin, Björn Jonson, Nasser Kalantar-Nayestanaki, Philip Woods, Ángel Perea, C. Wheldon, R. Crespo, Thomas Aumann, Hans Geissel, Z. Elekes, Andreas Martin Heinz, J. M. Boillos, B. A. Brown, D. Galaviz, T. Kröll, S. Chakraborty, K. Göbel, Enrique Nácher, H. Weick, Rituparna Kanungo, P. Díaz Fernández, K. Boretzky, M. Caamaño, Anisur Rahaman, C. Caesar, J. Benlliure, F. Wamers, D. Rossi, Haik Simon, Olof Tengblad, C. Nociforo, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), R$^3$B, Energy and Sustainability Research Institute Groni, Research unit Nuclear & Hadron Physics, Royal Society (UK), Department of Energy (US), Federal Ministry of Education and Research (Germany), State of Hesse, Technische Universität Darmstadt, Helmholtz Association, European Young Investigator Awards, Swedish Research Council, Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), Xunta de Galicia, German Research Foundation, National Science Foundation (US), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Nuclear and High Energy Physics, Quasi-free scattering reactions, Field (physics), Proton, Nuclear Theory, Shell (structure), FOS: Physical sciences, Shell evolution, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Atomic, Nuclear physics, Magic number (programming), Particle and Plasma Physics, 0103 physical sciences, Neutron, Nuclear, ddc:530, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Mathematical Physics, Spin-½, Physics, 010308 nuclear & particles physics, Scattering, Molecular, Spin-orbit splitting, Nuclear & Particles Physics, lcsh:QC1-999, 3. Good health, Valley of stability, Tensor force, Magic numbers, Física nuclear, lcsh:Physics, Astronomical and Space Sciences, Exotic nuclei
Abstract

9 pags., 5 figs., 2 tabs., The evolution of the traditional nuclear magic numbers away from the valley of stability is an active field of research. Experimental efforts focus on providing key spectroscopic information that will shed light into the structure of exotic nuclei and understanding the driving mechanism behind the shell evolution. In this work, we investigate the Z=6 spin-orbit shell gap towards the neutron dripline. To do so, we employed NA(p,2p)CA−1 quasi-free scattering reactions to measure the proton component of the 2 state of C. The experimental findings support the notion of a moderate reduction of the proton 1p−1p spin-orbit splitting, at variance to recent claims for a prevalent Z=6 magic number towards the neutron dripline., This work was supported by the Royal Society award UF150476, UK STFC awards ST/M006433/1 and ST/P003885/1, U.S. Department of Energy, Office of Nuclear Physics, contract No. DE-AC02- 05CH11231 (LBNL), the German Federal Ministry of Education and Research (BMBF projects 05P15RDFN1, 05P15WOFNA and 05P19RDFN1), the GSI-TU Darmstadt cooperation agreement, the State of Hesse through the LOEWE center HIC for FAIR, the Helmholtz-Gemeinschaft through the graduate school HGS-HIRe and Young Investigators Grants, and the Swedish Research Council under contract number 621-2011-5324. This work was also supported by the Spanish research grants (Ministerio Ciencia e Innovación), FPA2015-64969-P, FPA2015-69640-C2-1-P, FPA2017- 87568-P, PGC2018-099746-B-C21, RTI2018-098868-B-I00, Undidad de Excelencia María de Maeztu under project MDM-2016.0692, and the Xunta de Galicia research grant GRC ED431C 2017/54. This work was partly supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - Project-ID 279384907 - SFB 1245. C.A.B. acknowledges support from the U.S. NSF Grant No. 1415656, and U.S. DOE Grant No. DE-FG02-08ER41533.

Published
2020

10. Electromagnetic pulse generation in laser-proton acceleration from conductive and dielectric targets

Author

P. Mur, I Sanchez, J. Benlliure, Michael Seimetz, A. Ruiz-de la Cruz, C. Ruiz, R. Lera, Jose M. Benlloch, Rosa Letizia Zaffino, P. Bellido, and Luis Roso

Subjects
Materials science, Laser-plasma interaction, business.industry, Electromagnetic pulse, Nanosecond, Condensed Matter Physics, Laser, 01 natural sciences, 010305 fluids & plasmas, law.invention, Acceleration, Laser-ion acceleration, Amplitude, Optics, Nuclear Energy and Engineering, law, 0103 physical sciences, Radio frequency, 010306 general physics, business, Noise (radio), Excitation
Abstract

[EN] Laser-plasma interactions at high intensities are often accompanied by emission of a strong electromagnetic pulse (EMP) interfering with particle detectors or other electronic equipment. We present experimental evidence for significant differences in noise amplitudes in laser-proton acceleration from aluminium as compared to mylar target foils. Such dissimilarities have been consistently observed throughout two series of measurements indicating that, under otherwise identical conditions, the target conductivity is the principal parameter related to EMP generation. In addition, the lateral size of the target foils correlates with the absolute noise levels. A frequency analysis combined with numerical simulations allows for an identification of several sources of radiofrequency emission in the MHz-GHz regime. Further, the temporal evolution of single frequencies on the nanosecond scale provides information on distinct excitation mechanisms., This project has been funded by Ministerio de Economia y Competitividad, reference RTC-2015-3278-1, with further support by Ministerio de Ciencia, Innovacion y Universidades, reference RTI2018-101578-B-C22.

Published
2020

11. Performance of resistive plate chambers under irradiation of 136Xe at relativistic energies

Author

J. Benlliure, I. Duran, Enrique Casarejos, C. Paradela, and Yassid Ayyad

Subjects
Quenching, Physics, Nuclear and High Energy Physics, Resistive touchscreen, 010308 nuclear & particles physics, Time resolution, 01 natural sciences, Signal, Standard deviation, 030218 nuclear medicine & medical imaging, Ion, Nuclear physics, 03 medical and health sciences, 0302 clinical medicine, 0103 physical sciences, Irradiation, Atomic physics, Instrumentation
Abstract

Time resolution and efficiency of single-gap ( 300 μ m ) multi-strip timing resistive plate chambers (tRPC) have been investigated using 136 Xe ions accelerated at 560 A MeV with different rates. A time resolution of 37 ps (standard deviation) has been achieved for an irradiation rate of 12 Hz ∕ cm 2 . The tRPC also provides a detection efficiency above 98%. Our results show that an increase of the irradiation rate clearly leads to a degradation of the time resolution and a quenching of the signal charge.

Published
2017

12. Coulomb dissociation of $^{16}$O into $^{4}$He and $^{12}$C

Author

Markus Reich, Zsolt Fülöp, Ralf Plag, J. Benlliure, D. Cortina-Gil, Marcel Heine, T. Kröll, H. Törnqvist, A. Kelic-Heil, Kafa Khasawneh, B. Thomas, Tanja Heftrich, Joochun Park, O. Kiselev, Håkan T Johansson, Haik Simon, Tahani Almusidi, Olof Tengblad, Christopher Lehr, Ángel Perea, Lukas Ponnath, Thomas Nilsson, H. Alvarez-Pol, Sonja Storck, C. Caesar, Junki Tanaka, Heiko Scheit, Bastian Löher, Z. Slavkovská, M. Volknandt, rey Danilov, Konrad Schmidt, Sonia Escribano Rodriguez, Rene Reifarth, Isabell Deuter, Enrique Casarejos, T. Hensel, Deniz Kurtulgil, Liam Atkins, Anna-Lena Hartig, Lukas Bott, B. Brückner, Armel Kamenyero, Silvia Murillo Morales, Yuri A. Litvinov, S. Fiebiger, Jan Glorius, Matthias Holl, Igor Gašparić, Hendrik Schulte, Romana Popocovski, Enis Lorenz, José L. Sánchez, Stefan Typel, V. Wagner, Viktor Starostin, Stefanos Paschalis, Deniz Savran, David Gonzales Caamaño, Leonard Brandenburg, Daniel Körper, Felix Wamers, Ashton Falduto, Christoph Langer, Björn Jonson, Christian Sürder, María José García Borge, P. Erbacher, László Varga, N. Kurz, Philipp Klenze, Dmytro Kresan, Klaus Volk, Alexander Grein, Marvin Kohls, Kathrin Göbel, Pablo Cabanelas Eiras, Han-Bum Rhee, Roman Gernhäuser, Lorenzo Zanetti, Daniel Bemmerer, Konstanze Boretzky, Enrique Nácher, reas Heinz, D. M. Rossi, Leonid Chulkov, Mario Weigand, Joakim Cederkäll, Michael Heil, Nasser Kalantar-Nayestanaki, Marina Petri, Thomas Aumann, Henning Heggen, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), Energy and Sustainability Research Institute Groni, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-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), Technische Universität Darmstadt, Federal Ministry of Education and Research (Germany), and Croatian Science Foundation

Subjects
Paper, History, Scintillator, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Dissociation (chemistry), Education, Ion, Nuclear physics, nucleosynthesis, 12C(α, γ)16O, Coulomb dissociation, R3B setup, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, 0103 physical sciences, Coulomb, Nuclear fusion, ddc:530, 010306 general physics, Physics, 010308 nuclear & particles physics, Scattering, Charge number, ddc, Computer Science Applications, Nucleon
Abstract

8 pags., 3 figs., We measured the Coulomb dissociation of 16O into 4He and 12C at the R3B setup in a first campaign within FAIR Phase 0 at GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt. The goal was to improve the accuracy of the experimental data for the 12C(α,γ)16O fusion reaction and to reach lower center-ofmass energies than measured so far. The experiment required beam intensities of 109 16O ions per second at an energy of 500 MeV/nucleon. The rare case of Coulomb breakup into 12C and 4He posed another challenge: The magnetic rigidities of the particles are so close because of the same mass-to-charge-number ratio A/Z = 2 for 16O, 12C and 4He. Hence, radical changes of the R3B setup were necessary. All detectors had slits to allow the passage of the unreacted 16O ions, while 4He and 12C would hit the detectors’ active areas depending on the scattering angle and their relative energies. We developed and built detectors based on organic scintillators to track and identify the reaction products with sufficient precision., This project was carried out within FAIR Phase 0 at GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt. This project was supported by the Bundesministerium für Bildung und Forschung (BMBF) (05P19RFFN1, 05P15RFFN1, 05P15RDFN1), HGS-HIRE, HIC for FAIR and the GSI-TU Darmstadt cooperation agreement. I. Gašparić and R. Popočovski have been supported by the Croatian Science Foundation under projects no. 1257 and 7194.

Published
2019

13. Experimental study of nuclear fission along the thorium isotopic chain: From asymmetric to symmetric fission

Author

Helmut Weick, Laurent Tassan-Got, Håkan T Johansson, T. Gorbinet, L. Grente, J. Vargas, Herbert A. Simon, M. Caamaño, A. Kelic-Heil, S. Pietri, E. Casarejos, B. Laurent, Andreas Martin Heinz, J-F Martin, E. Pellereau, F. Farget, H. Alvarez-Pol, N. Kurz, L. Audouin, B. Jurado, J. Benlliure, Bernd Voss, A. Ebran, A. Prochazka, C. Paradela, J. Taieb, J. L. Rodriguez-Sanchez, Yassid Ayyad, G. Belier, B. Fernández-Domínguez, D. Cortina-Gil, C. Nociforo, A. Chatillon, G. Boutoux, Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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), 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), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and 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 reaction, Physics, 010308 nuclear & particles physics, Fission, Nuclear Theory, Thorium, chemistry.chemical_element, Coulomb excitation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, chemistry, Nuclear fission, 0103 physical sciences, Nuclear Reactions, Physics::Atomic and Molecular Clusters, Isobaric process, ddc:530, Atomic number, Nuclear Experiment, 010306 general physics, Excitation
Abstract

International audience; The inverse kinematics technique, applied to radioactive beams and combined to the Coulomb excitation method, is a powerful tool to study low-energy fission. A novel experimental setup was developed within the R3B/SOFIA (Reactions with Relativistic Radioactive Beams/Studies On FIssion with Aladin) collaboration to identify in mass and atomic numbers both fission fragments in coincidence. These new data provide elemental, isobaric, and isotonic yields for the fission along the thorium isotopic chain. Results are also compared to previous measurements using either the same reaction mechanism or thermal-neutron induced fission. This latter comparison permits to probe the influence of the excitation energy in the fission process.

Published
2019

14. New spectroscopic information on Tl211,213 : A changing structure beyond the N=126 shell closure

Author

S. Leoni, Hans Geissel, A. Sharma, Robert Hoischen, A. M. Denis Bacelar, A. Bracco, Enrique Casarejos, N. Goel, Matthew Reed, A. Prochazka, D. Bazzacco, S. M. Lenzi, T.P.D. Swan, Imrich Szarka, N. Al-Dahan, Philip M Walker, T. Habermann, A. Gottardo, J. Benlliure, Andrea Corsi, A. Gadea, S. Klupp, E. Gregor, C. Nociforo, Zs. Dombrádi, Alison Bruce, D. Mengoni, Oliver Wieland, Roberto Vicençotto Ribas, A. I. Morales, M. Bunce, Helmut Weick, A. Y. Deo, F. Nowacki, K. Eppinger, C. Domingo-Pardo, A. Algora, M. L. Cortés, E. Sahin, S. Pietri, M. Bowry, J. Alcántara Núñez, H. Schaffner, F. Naqvi, T. Engert, K. Steiger, R. Janik, F. C. L. Crespi, M. Pfützner, J. Gerl, N. Alkhomashi, Maria Doncel, H. J. Wollersheim, W. Prokopowicz, F. Farinon, B. Million, C. A. Ur, Peter Strmen, Y. Ayyad, Davinder Siwal, S. K. Mandal, Roberto Menegazzo, F. Camera, Enrico Maglione, J. J. Valiente-Dobón, P. Boutachkov, Dirk Rudolph, J. Grebosz, P. R. P. Allegro, S. Lunardi, P. H. Regan, G. de Angelis, G. Benzoni, F. Recchia, D. R. Napoli, G. F. Farrelly, Zs. Podolyák, M. Górska, Branislav Sitar, N. Kurz, and I. Kojouharov

Subjects
Physics, Nuclear physics, Fragmentation (mass spectrometry), chemistry, Isotope, 010308 nuclear & particles physics, 0103 physical sciences, Nuclear structure, chemistry.chemical_element, Gamma spectroscopy, Uranium, 010306 general physics, 01 natural sciences
Abstract

The neutron-rich isotopes 211;213Tl, beyond the N = 126 shell-closure, have been studied for the first time in isomer γ-ray decay, exploiting the fragmentation of a primary uranium beam at the FRS-RISING (FRagment Separator-Rare ISotopes INvestigation at GSI) setup at GSI. The observed isomeric states in 211;213Tl show a deviation from the seniority-like scheme of 209Tl. The possible interpretation of the data is discussed on the basis of energy-level systematics and shell-model calculations.

Published
2019

15. Neutron-rich fragments produced by in-flight fission of U-238

Author

K. Sümmerer, Andreas Martin Heinz, J. L. Rodriguez-Sanchez, Kerttuli Helariutta, D. Pérez-Loureiro, M. Staniou, L. Pienkowski, A. Trzcińska, J. Díaz-Cortes, M. Gascon, J. Taieb, V. Föhr, K. Subotic, Enrique Casarejos, J. Benlliure, W. Gawlikowicz, K.-H. Schmidt, S. Lukic, B. Blank, Fernando Montes, H. Alvarez-Pol, D. Dragosavac, A. Kelic-Heil, and Department of Chemistry

Subjects
Physics, COLLISIONS, Isotope, 010308 nuclear & particles physics, Fission, Projectile, Nuclear Theory, 116 Chemical sciences, Separator (oil production), 01 natural sciences, 114 Physical sciences, CROSS-SECTIONS, Nuclear physics, MODEL, YIELDS, 0103 physical sciences, Coulomb, RESIDUES, ISOTOPES, Neutron, PROJECTILE-FISSION, 010306 general physics, Nuclear Experiment, NUCLEUS
Abstract

The production cross sections of neutron-rich fission residues in reactions induced by U238 projectiles at 950A MeV impinging on Pb and Be targets are investigated at the Fragment Separator at GSI. These two targets allow us to investigate fission processes induced by two reaction mechanisms, Coulomb and nuclear excitations, and to study the role of these mechanisms in the neutron excess of the final fragments. © 2019 American Physical Society.

Published
2019

16. Insight into excitation energy and structure effects in fission from isotopic information in fission yields

Author

D. Ramos, M. Caamaño, F. Farget, C. Rodríguez-Tajes, L. Audouin, J. Benlliure, E. Casarejos, E. Clement, D. Cortina, O. Delaune, X. Derkx, A. Dijon, D. Doré, B. Fernández-Domínguez, G. de France, A. Heinz, B. Jacquot, C. Paradela, M. Rejmund, T. Roger, M.-D. Salsac, C. Schmitt, 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), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut Pluridisciplinaire Hubert Curien (IPHC), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, [PHYS]Physics [physics], Spectrometer, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Fission, Nuclear Theory, Inelastic scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, 0103 physical sciences, Nuclear fusion, Neutron, Atomic number, Multiplicity (chemistry), 010306 general physics, Nuclear Experiment, Excitation, ComputingMilieux_MISCELLANEOUS
Abstract

International audience; The use of the inverse kinematics technique and a magnetic spectrometer permits the simultaneous measurement of proton and neutron content of full fission fragment distributions. This paper reports new measurements of five fissioning systems—U238,Np239,Pu240,Cm244, and Cf250—produced in inelastic scattering, transfer, and fusion reactions at different excitation energies. As a result, isotopic, elemental, and isotonic fission yields are presented. The contribution of the different fission modes and the proton even-odd effect are studied. Structure effects are investigated by means of the neutron excess and the total neutron multiplicity as a function of the fragment atomic number.

Published
2019

17. Fission Studies in Inverse Kinematics

Author

J. Benlliure, J. L. Rodriguez-Sanchez, J. Taieb, M. Feijoo, Direction des Applications Militaires (DAM), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
Physics, Fission, Inverse kinematics, 010308 nuclear & particles physics, Nuclear Theory, Charge (physics), Solid base, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Relativistic energies, 01 natural sciences, Nuclear physics, Scientific method, 0103 physical sciences, Dissipative system, Nuclear Experiment, 010306 general physics
Abstract

International audience; In this work, we present the results obtained from the data analysis of the SOFIA experiment, performed in 2014 at the GSI, whose characteristics allowed us to achieve the complete identification (charge and mass) of both fission fragments for the first time. In particular, the nuclear-collision fission induced reaction$^{236}$U+Al at 720 A MeV is being matter of work. Our goal is to study the fission dynamics through the study of its dissipative effects. The work done so far have showed us a good resolution in charge of the fission fragments, setting a solid base to go further. In the future, we plan to improve the experimental technique inducing fission using quasifree (p,2p) reactions, to better control the initial conditions of the process.

Published
2019

18. Quasi-free neutron and proton knockout reactions from light nuclei in a wide neutron-to-proton asymmetry range

Author

P. J. Woods, Matthias Heil, K. Boretzky, W. N. Catford, A. Henriques, M. Caamaño, Thomas Nilsson, J. Benlliure, P. Velho, Yasuhiro Togano, F. Wamers, I. Syndikus, E. Cravo, H. Alvarez-Pol, Joachim Enders, N. Kurz, O. Sorlin, Rituparna Kanungo, Deniz Savran, C. Nociforo, Mikhail V. Zhukov, L. M. Fraile, Marine Vandebrouck, Björn Jonson, M. Heine, Haik Simon, Roman Gernhäuser, Olof Tengblad, M. Holl, Z. Elekes, M. A. Najafi, Heiko Scheit, Carlos A. Bertulani, Kai Zuber, J. S. Winfield, T. Le Bleis, D. Cortina-Gil, L. Atar, Enrique Casarejos, Joakim Cederkäll, T. Kröll, C. Caesar, G. L. Wilson, G. Ribeiro, A. Kelic-Heil, Christoph Langer, Nasser Kalantar-Nayestanaki, Helmut Weick, Håkan T Johansson, Pavel Golubev, C. Wheldon, Thomas Aumann, Andreas Martin Heinz, Stefanos Paschalis, P. Díaz Fernández, D. M. Rossi, Enrique Nácher, Simon Lindberg, Catherine Rigollet, S. Beceiro-Novo, J. M. Boillos, L. V. Chulkov, Tanja Heftrich, V. Panin, D. Galaviz Redondo, Jorge Machado, Marina Petri, Rene Reifarth, Iris Dillmann, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), 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), R3B, Federal Ministry of Education and Research (Germany), Technische Universität Darmstadt, Helmholtz International Center for FAIR, European Commission, Ministerio de Ciencia e Innovación (España), Ministerio de Economía, Industria y Competitividad (España), Swedish Research Council, National Science Foundation (US), Department of Energy (US), Fundação para a Ciência e a Tecnologia (Portugal), LIBPhys-UNL, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-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), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, Proton, 3313 Tecnología E Ingeniería Mecánicas, media_common.quotation_subject, Nuclear Theory, Aucun, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Asymmetry, Nuclear physics, Momentum, Shell model, 0103 physical sciences, Neutron, ddc:530, 010306 general physics, Nuclear Experiment, Quasi-free scattering, media_common, Physics, Range (particle radiation), 010308 nuclear & particles physics, Scattering, 2207 Física Atómica y Nuclear, lcsh:QC1-999, Inverse kinematics, Isospin, Física nuclear, Spectroscopic factors, Beam (structure), lcsh:Physics
Abstract

7 pags., 4 figs., 2 tabs. -- Open Access funded by Creative Commons Atribution Licence 4.0, The quasi-free scattering reactions C(p,2p) and C(p,pn) have been studied in inverse kinematics at beam energies of 300–400 MeV/u at the RB-LAND setup. The outgoing proton-proton and proton-neutron pairs were detected in coincidence with the reaction fragments in kinematically complete measurements. The efficiency to detect these pairs has been obtained from GEANT4 simulations which were tested using the C(p,2p) and C(p,pn) reactions. Experimental cross sections and momentum distributions have been obtained and compared to DWIA calculations based on eikonal theory. The new results reported here are combined with previously published cross sections for quasi-free scattering from oxygen and nitrogen isotopes and together they enable a systematic study of the reduction of single-particle strength compared to predictions of the shell model over a wide neutron-to-proton asymmetry range. The combined reduction factors show a weak or no dependence on isospin asymmetry, in contrast to the strong dependency reported in nucleon-removal reactions induced by nuclear targets at lower energies. However, the reduction factors for (p,2p) are found to be 'significantly smaller than for (p,pn) reactions for all investigated nuclei., This work was supported by the German Federal Ministry of Education and Research (BMBF projects 05P2015RDFN1 and 05P15WOFNA), through the GSI-TU Darmstadt cooperation agreement, by the State of Hesse through the LOEWE center HIC for FAIR, and the Helmholtz-Gemeinschaft through the graduate school HGS-HIRe. This work was supported by the European Union by means of the European Commission within its Seventh Framework Program (FP7) via ENSAR (Contract No. 262010), and the Spanish CICYT research grants FPA2012-32443, FPA2015-64969-07387, and FPA2015-69640-C2-1-P. This work has supported by the Swedish Research Council under contract number 621-2011-5324. C.A.B. acknowledges support from the U.S. NSF grant No. 1415656 and the U.S. DOE grant No. DE-FG02-08ER41533. Supported by the Portuguese FCT under the project PTDC/FIS/ 103902/2008.

Published
2019

19. Systematic Investigation of Nucleon Knockout around $^{132}$Sn

Author

J. L. Rodriguez-Sanchez, M. Staniou, L. Pienkowski, J. Díaz-Cortes, V. Föhr, J. Taieb, Enrique Casarejos, D. Cortina-Gil, Thomas Aumann, S. Lukic, Fernando Montes, J. Benlliure, Andreas Martin Heinz, K. Subotic, D. Dragosavac, K. H. Schmidt, A. Kelic-Heil, A. Trzcińska, W. Gawlikowicz, H. Alvarez-Pol, A. Gargano, Kerttuli Helariutta, B. Blank, M. Gascón, Carlos A. Bertulani, D. Pérez-Loureiro, K. Sümmerer, 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), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Department of Physics, Tracers in Molecular Imaging (TRIM), Department of Chemistry, 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
Nuclear physics, Physics, 010308 nuclear & particles physics, 0103 physical sciences, education, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, Nucleon, Nuclear Experiment, 01 natural sciences, 114 Physical sciences
Abstract

International audience; Neutron- and proton-removal cross sections for nuclei around ^132Sn have been systematically measured. The measurements clearly show the effect of the N = 82 closed shells. Model calculations describing all processes leading to single nucleon removal residual nuclei provide a reasonable description of the neutron removal process but clearly overestimate the proton removal ones. This overestimation of the proton removal channels could be explained as due to the presence of short-range correlated neutron-proton pairs in nuclei.

Published
2018

20. Systematic reduction of the proton-removal cross section in neutron-rich medium-mass nuclei

Author

Andreas Martin Heinz, K.-H. Schmidt, B. Blank, M. Staniou, J. Benlliure, A. Kelic-Heil, K. Helariutta, W. Gawlikowicz, Enrique Casarejos, J. L. Rodriguez-Sanchez, Thomas Aumann, L. Pienkowski, K. Sümmerer, J. Díaz-Cortes, D. Cortina-Gil, M. Gascon, A. Gargano, Carlos A. Bertulani, H. Alvarez-Pol, A. Trzcińska, S. Lukic, D. Dragosavac, Fernando Montes, J. Taieb, V. Föhr, D. Pérez-Loureiro, K. Subotic, Materials Physics, Tracers in Molecular Imaging (TRIM), Department of Chemistry, 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), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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
inorganic chemicals, Nuclear and High Energy Physics, Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 114 Physical sciences, 01 natural sciences, Nuclear Theory (nucl-th), Nuclear physics, Medium-mass neutron-rich nuclei, 0103 physical sciences, ddc:530, Neutron, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, Short-range correlations, Nuclear theory, Physics, 010308 nuclear & particles physics, technology, industry, and agriculture, 115 Astronomy, Space science, lcsh:QC1-999, Nucleon removal, 3. Good health, biological sciences, Physics::Accelerator Physics, lipids (amino acids, peptides, and proteins), Nucleon, lcsh:Physics
Abstract

Single-neutron and single-proton removal cross sections have been measured for medium-mass neutron-rich nuclei around Z=50 and energies around 1000A MeV using the FRagment Separator (FRS) at GSI. The measured cross sections confirm the relative low values of the proton-removal cross sections, observed since a long time ago and not yet understood. Model calculations considering the knock-out process together with initial- and final-state interactions describe the measured neutron-removal cross sections. Proton-removal cross sections are, however, significantly over-predicted by the same calculations. The observed difference can be explained to a large extent by the knock-out of short-range correlated nucleons from dominant neutron-proton pairs in neutron-rich nuclei.

Published
2020

21. Laser-driven neutrons for time-of-flight experiments?

Author

J. Lerendegui-Marco, Carlos Guerrero, L. Martín, D. Cortina, T. Rodríguez-González, J. Benlliure, J. Gómez, D. Cano-Ott, C. Domingo-Pardo, J. Peñas, J. M. Quesada, Ariel Tarifeño-Saldivia, Begoña Fernández, T. Martinez, M. A. Millán-Callado, and Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear

Subjects
Physics, 010308 nuclear & particles physics, QC1-999, Nuclear engineering, Nuclear Theory, Neutron radiation, Laser, 01 natural sciences, Pulse (physics), law.invention, Time of flight, Acceleration, law, 0103 physical sciences, Femtosecond, Physics::Accelerator Physics, Neutron source, Neutron, Nuclear Experiment, 010306 general physics
Abstract

Neutron beams, both pulsed and continuous, are a powerful tool in a wide variety of research fields and applications. Nowadays, pulsed neutron beams are produced in conventional accelerator facilities in which the time-of-fight technique is used to determine the kinetic energy of the neutrons inducing the reactions of interest.In the last decades, the development of ultra-short (femtosecond) and ultra-high power (> 1018W/cm2) lasers has opened the door to a vast number of new applications, including the production and acceleration of pulsed ion beams. These have been recently used to produce pulsed neutron beams, reaching fluxes per pulse similar and even higher than those of conventional neutron beams, hence becoming an alternative for the pulsed neutron beam users community. Nevertheless, these laser-driven neutrons have not been exploited in nuclear physics experiments so far.Our main goal is to produce and characterize laser-driven neutrons but optimizing the analysis, diagnostic and detection techniques currently used in conventional neutron sources to implement them in this new environment. As a result, we would lay down the viability of carrying out nuclear physics experiments using this kind of sources by identifying the advantages and limitations of this production method.To achieve this purpose, we plan to perform experiments in both medium (50TW@L2A2, in Santiago de Com-postela) and high (1PW@APOLLON, in Paris) power laser facilities.

Published
2020

22. Spectroscopy of $\eta ^{\prime }$-mesic Nuclei with WASA at GSI/FAIR

Author

M. Iwasaki, H. Fujioka, Hans Geissel, Satoru Hirenzaki, C. Guo, R. Knöbel, E. Haettner, V. Metag, Christine Hornung, Imrich Szarka, C. Rappold, J. Benlliure, Frank Goldenbaum, Timo Dickel, Yasumoto Tanaka, R. Ruber, James Ritman, Tomofumi Nagae, K. Itahashi, Paweł Moskal, J. L. Rodriguez-Sanchez, J. Zhao, Oleksandr Rundel, S. Pietri, Y. Igarashi, N. Kuzminchuk, Hooi Jin Ong, A. Yamamoto, N. Ikeno, Helmut Weick, Bao-Hua Sun, V. Serdyuk, V. Drozd, Y. Ma, S.Y. Matsumoto, Hideko Nagahiro, M. Takechi, Herbert A. Simon, Bettina Lommel, S. Minami, R. Kanungo, Nasser Kalantar-Nayestanaki, Isao Tanihata, A. Prochazka, Daisuke Jido, M. Nakagawa, Magdalena Skurzok, T.R. Saito, Branislav Sitar, Ryugo S. Hayano, W. R. Plass, N. Kurz, R. Sekiya, Birgit Kindler, Haruhiko Outa, M.N. Harakeh, S. Terashima, I. G. Mukha, S. Purushothaman, C. Scheidenberger, S. Bagchi, D. Kostyleva, Peter Strmen, and Hiroyuki Ekawa

Subjects
Physics, Proton, Meson, 010308 nuclear & particles physics, Detector, General Physics and Astronomy, 01 natural sciences, Prime (order theory), Nuclear physics, Deuterium, 0103 physical sciences, ddc:530, 010306 general physics, Spectroscopy, Beam (structure)
Abstract

Acta physica Polonica / B Particle physics and field theory, nuclear physics, theory of relativity 51(1), 39 (2020). doi:10.5506/APhysPolB.51.39, Published by Inst. of Physics, Jagellonian Univ., Cracow

Published
2020

23. Structure of Be13 studied in proton knockout from B14

Author

Roy Crawford Lemmon, C. Wimmer, U. Datta Pramanik, K. Goebel, I. Syndikus, Nasser Kalantar-Nayestanaki, C. Wheldon, Enrique Nácher, Thomas Aumann, J. S. Winfield, Andreas Martin Heinz, N. Kurz, L. M. Fraile, Hans Geissel, Rene Reifarth, Mikhail V. Zhukov, J. Marganiec, E. Cravo, P. Velho, M. Heine, M. Caamaño, M. Roeder, O. Ershova, Alfredo Estrade, Martin Freer, Daniel Bemmerer, G. L. Wilson, P. J. Woods, S. Pietri, Z. Elekes, G. Ribeiro, Björn Jonson, J. M. Boillos, Joakim Cederkäll, J. Taylor, J. Hagdahl, Herbert A. Simon, Paloma Diaz Fernandez, T. Kroell, Andreas Wagner, Matthias Heil, R. Crespo, A. Ignatov, M. J. G. Borge, K. Riisager, Roman Gernhaeuser, K. Boretzky, A. Movsesyan, Andreas Zilges, Carlos A. Bertulani, A. Hufnagel, H. O. U. Fynbo, A. Kelic-Heil, V. Panin, T. Le Bleis, Christoph Langer, D. Cortina-Gil, L. Atar, E. Casarejos, R. Thies, Jorge Machado, Joachim Enders, Olof Tengblad, Marina Petri, Ralf Plag, J. Benlliure, Deniz Savran, D. M. Rossi, Marielle Chartier, C. Caesar, Y. Aksyutina, Simon Lindberg, Catherine Rigollet, L. V. Chulkov, Daniel Galaviz, M. Holl, O. Sorlin, C. Nociforo, Helmut Weick, Håkan T Johansson, H. Scheit, W. N. Catford, Ángel Perea, Vladimir Avdeichikov, I. Dillmann, Pavel Golubev, F. Farinon, Stefanos Paschalis, H. Alvarez-Pol, R. Kanungo, Marine Vandebrouck, Kai Zuber, M. Labiche, A. Henriques, S. Beceiro-Novo, Thomas Nilsson, F. Wamers, and Tanja Heftrich

Subjects
Physics, Nuclear reaction, Proton, 010308 nuclear & particles physics, Nuclear Theory, Gamma ray, Halo nucleus, 01 natural sciences, Resonance (particle physics), Nuclear physics, Excited state, 0103 physical sciences, Neutron, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

The neutron-unbound isotope Be-13 has been studied in several experiments using different reactions, different projectile energies, and different experimental setups. There is, however, no real consensus in the interpretation of the data, in particular concerning the structure of the low-lying excited states. Gathering new experimental information, which may reveal the Be-13 structure, is a challenge, particularly in light of its bridging role between Be-12, where the N = 8 neutron shell breaks down, and the Borromean halo nucleus Be-14. The purpose of the present study is to investigate the role of bound excited states in the reaction product Be-12 after proton knockout from B-14, by measuring coincidences between Be-12, neutrons, and gamma rays originating from de-excitation of states fed by neutron decay of Be-13. The Be-13 isotopes were produced in proton knockout from a 400 MeV/nucleon B-14 beam impinging on a CH2 target. The Be-12-n relative-energy spectrum d sigma/dE(fn) was obtained from coincidences between Be-12(g.s.) and a neutron, and also as threefold coincidences by adding gamma rays, from the de-excitation of excited states in Be-12. Neutron decay from the first 5/2(+) state in Be-13 to the 2(+) state in Be-12 at 2.11 MeV is confirmed. An energy independence of the proton-knockout mechanism is found from a comparison with data taken with a 35 MeV/nucleon B-14 beam. A low-lying p-wave resonance in Be-13(1/2(-)) is confirmed by comparing proton- and neutron-knockout data from B-14 and Be-14.

Published
2018

24. Preparation and characterization of micro-nano engineered targets for high-power laser experiments

Author

Luis Roso, Rosa Letizia Zaffino, Michael Seimetz, Jose M. Benlloch, Manuel Lozano, P. Mur, David Quirion, Giulio Pellegrini, J. Benlliure, Isabel Sánchez, L. Martín, and Alejandro Ruiz de la Cruz

Subjects
Materials science, Fabrication, Nanotechnology, 01 natural sciences, law.invention, Acceleration, Atomic layer deposition, Solid target, Etching (microfabrication), law, 0103 physical sciences, Electrical and Electronic Engineering, 010306 general physics, Ultra-thin membrane, Microelectromechanical systems, 010308 nuclear & particles physics, Laser-driven proton acceleration, TNSA, Condensed Matter Physics, Laser, Atomic and Molecular Physics, and Optics, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Characterization (materials science), Particle acceleration, HPL
Abstract

[EN] The continuous development of ultra-fast high-power lasers (HPL) technology with the ability of working at unprecedented repetition rates, between 1 and 10 Hz, is raising the target needs for experiments in the different areas of interest to the HPL community. Many target designs can be conceived according to specific scientific issues, however to guarantee manufacturing abilities that enable large number production and still allow for versatility in the design is the main barrier in the exploitation of these high repetition rate facilities. Here, we have applied MEMS based manufacturing processes for this purpose. In particular, we have focused on the fabrication and characterization of submicrometric conductive membranes embedded in a silicon frame. These kinds of solid targets are used for laser-driven particle acceleration through the so-called Target Normal Sheath Acceleration mechanism (TNSA). They were obtained by top-down fabrication alternating pattern transfer, atomic layer deposition, and selective material etching. The adaptability of the approach is then analyzed and discussed by evaluating different properties of targets for use in laser-driven particle acceleration experiments. These characteristics include the surface properties of membranes after fabrication and the high density of the target array. Finally, we were able to show their efficiency for laser-driven proton acceleration in a series of experiments with a 3 TW table-top laser facility, achieving stable proton acceleration up to 2 MeV., The authors highly appreciate the collaboration of Radosys (Budapest) which provided CR-39 detector material, etching bath, and readout equipment. This project has been financed by the Spanish Ministry for Economy and Competitiveness within the Retos-Colaboracion 2015 initiative, ref. RTC-2015-3278-1. P. Mur has received a grant of the Garantia Juvenil 2015 program. This work has made use of the Spanish ICTS Network MICRONANOFABS partially supported by MEINCOM.

Published
2018

25. Isotopic fission-fragment distributions of U238, Np239, Pu240, Cm244 , and Cf250 produced through inelastic scattering, transfer, and fusion reactions in inverse kinematics

Author

D. Ramos, M. Caamaño, F. Farget, C. Rodríguez-Tajes, L. Audouin, J. Benlliure, E. Casarejos, E. Clement, D. Cortina, O. Delaune, X. Derkx, A. Dijon, D. Doré, B. Fernández-Domínguez, G. de France, A. Heinz, B. Jacquot, A. Navin, C. Paradela, M. Rejmund, T. Roger, M.-D. Salsac, and C. Schmitt

Subjects
Physics, Range (particle radiation), Spectrometer, 010308 nuclear & particles physics, Fission, Nuclear Theory, Inelastic scattering, 01 natural sciences, 7. Clean energy, Effective nuclear charge, Nuclear physics, Nuclear fission, 0103 physical sciences, Nuclear fusion, Nuclear Experiment, 010306 general physics, Excitation
Abstract

Transfer- and fusion-induced fission in inverse kinematics has proved to be a powerful tool to investigate nuclear fission, widening information on the fission fragments and access to unstable fissioning systems with respect to other experimental approaches. An experimental campaign is being carried out at GANIL with this technique since 2008. In these experiments, a beam of U-238, accelerated to 6.1 MeV/u, impinges on a C-12 target. Fissioning systems from U to Cf are populated through inelastic scattering, transfer, and fusion reactions, with excitation energies that range from a few MeV up to 46 MeV. The use of inverse kinematics, the SPIDER telescope, and the VAMOS spectrometer allow the characterization of the fissioning system in terms of mass, nuclear charge, and excitation energy, and the isotopic identification of the full fragment distribution. This work reports on new data from the second experiment of the campaign on fission-fragment yields of the heavy actinides U-238, Np-239, Pu-240, Cm-244, and Cf-250, which are of interest from both fundamental and application points of view.

Published
2018

26. Strong neutron pairing in core+4n nuclei

Author

S. Beceiro-Novo, R. Thies, Jorge Machado, Andreas Martin Heinz, Tanja Heftrich, L. M. Fraile, A. Estrade, Marina Petri, T. Le Bleis, D. Cortina-Gil, L. Atar, T. Kröll, A. Knyazev, M. A. Najafi, G. L. Wilson, D. Rossi, Kai Zuber, A. Movsesyan, Z. Elekes, Simon Lindberg, I. Syndikus, P. Díaz Fernández, K. Göbel, Catherine Rigollet, Ángel Perea, R. Crespo, F. Farinon, J. Kahlbow, V. Volkov, M. Caamaño, W. N. Catford, A. Ignatov, S. Pietri, Carlos A. Bertulani, V. Panin, C. Langer, A. Kelic-Heil, O. Sorlin, Stefanos Paschalis, J. M. Boillos, Enrique Casarejos, J. Hagdahl, Iris Dillmann, M Vandebrouck, O. Ershova, K. Boretzky, A. Henriques, Roy Crawford Lemmon, J. S. Winfield, J. Benlliure, M. Labiche, Vladimir Avdeichikov, Enrique Nácher, H. Weick, Thomas Nilsson, F. Wamers, Rituparna Kanungo, M. Holl, C. Caesar, P. Velho, Håkan T Johansson, G. Ribeiro, Pavel Golubev, F. M. Marqués, M. Heine, Andreas Zilges, Hans Geissel, J. Enders, D. Galaviz, Daniel Bemmerer, Deniz Savran, Marielle Chartier, María José García Borge, Haik Simon, M. Freer, J. Taylor, Nasser Kalantar-Nayestanaki, Olof Tengblad, C. Wheldon, C. Nociforo, A. Revel, H. Alvarez-Pol, Joakim Cederkäll, Thomas Aumann, Rene Reifarth, L. Chulkov, J. Marganiec, Mikhail V. Zhukov, D. Yakorev, Björn Jonson, M. Röder, Philip Woods, R. Plag, U. Datta Pramanik, Andreas Wagner, R. Gernhäuser, E. Cravo, Y. Togano, H. Scheit, N. Kurz, M. Heil, 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 ), Laboratoire de physique corpusculaire de Caen ( LPCC ), Université de Caen Normandie ( UNICAEN ), Normandie Université ( NU ) -Normandie Université ( NU ) -Ecole Nationale Supérieure d'Ingénieurs de Caen ( ENSICAEN ), Normandie Université ( NU ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Institut de Recherches sur les lois Fondamentales de l'Univers ( IRFU ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien ( IPHC ), Centre National de la Recherche Scientifique ( CNRS ) -Université de Strasbourg ( UNISTRA ), R3B, Technische Universität Darmstadt, Federal Ministry of Education and Research (Germany), National Science Foundation (US), Department of Energy (US), 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), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-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), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Valence (chemistry), 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Aucun, General Physics and Astronomy, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Molecular physics, Pairing, 0103 physical sciences, Neutron, Física nuclear, Nuclear Experiment (nucl-ex), [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, Nucleon, Nuclear Experiment, R3B radioactive beams nuclear structure neutron-rich Coulomb dissociation
Abstract

6 pags., 4 figs., The emission of neutron pairs from the neutron-rich N = 12 isotones C-18 and O-20 has been studied by high-energy nucleon knockout from N-19 and O-21 secondary beams, populating unbound states of the two isotones up to 15 MeV above their two-neutron emission thresholds. The analysis of triple fragment-n-n correlations shows that the decay N-19(-1p)18C*-> C-16 + n + n is clearly dominated by direct pair emission. The two- neutron correlation strength, the largest ever observed, suggests the predominance of a C-14 core surrounded by four valence neutrons arranged in strongly correlated pairs. On the other hand, a significant competition of a sequential branch is found in the decay O-21(-1n)O-20*-> O-18 + n + n, attributed to its formation through the knockout of a deeply bound neutron that breaks the O-16 core and reduces the number of pairs., This work was supported by the German Federal Ministry for Education and Research (BMBF Project No. 05P15RDFN1), and through the GSI-TU Darmstadt cooperation agreement. C. A. Bertulani acknowledges support by U.S. Department of Energy Grant No. DE-FG02-08ER41533 and U.S. National Science Foundation Grant No. 1415656.

Published
2018

27. Quasifree ( p,pN ) scattering of light neutron-rich nuclei near N=14

Author

Roy Crawford Lemmon, M. Röder, Rituparna Kanungo, P. Cabanelas, M. Heil, S. Pietri, Hans Geissel, E. Y. Nikolskii, A. Movsesyan, J. Marganiec, O. Ershova, J. Enders, N. Kurz, V. Volkov, K. Boretzky, Iris Dillmann, Stefanos Paschalis, H. Scheit, F. Farinon, A. Estrade, Vladimir Avdeichikov, R. Plag, G. L. Wilson, A. Najafi, L. M. Fraile, V. Panin, A. M. Moro, D. Jurčiukonis, Simon Lindberg, Catherine Rigollet, Kai Zuber, U. Datta Pramanik, A. Henriques, J. Benlliure, F. Wamers, D. Yakorev, Carlos A. Bertulani, María José García Borge, J. S. Winfield, C. Langer, Andreas Zilges, I. Syndikus, A. Kelic-Heil, A. Deltuva, Thomas Nilsson, T. Le Bleis, M. Heine, G. Ribeiro, E. Cravo, D. Cortina-Gil, L. Atar, Nasser Kalantar-Nayestanaki, Mikhail V. Zhukov, Daniel Bemmerer, C. Wheldon, Marine Vandebrouck, D. Galaviz, Thomas Aumann, Y. Togano, Andreas Martin Heinz, O. Sorlin, Björn Jonson, M. Holl, T. Kröll, Andreas Wagner, Joakim Cederkäll, S. Beceiro-Novo, Ángel Perea, Enrique Nácher, Z. Elekes, H. Weick, B. Fernández-Domínguez, Philip Woods, Håkan T Johansson, K. Göbel, R. Gernhäuser, B. Pietras, Deniz Savran, Pavel Golubev, Haik Simon, M. Freer, Olof Tengblad, Rene Reifarth, Tanja Heftrich, C. Nociforo, W. N. Catford, D. Rossi, H. Alvarez-Pol, A. Ignatov, L. Chulkov, C. Caesar, J. Taylor, P. Velho, R. Crespo, A. Knyazev, R. Thies, Jorge Machado, Marina Petri, J. M. Boillos, J. Hagdahl, A. Hufnagel, M. Labiche, P. Díaz Fernández, Marielle Chartier, M. Caamaño, and Enrique Casarejos

Subjects
Physics, Proton, Inverse kinematics, 010308 nuclear & particles physics, Scattering, Nuclear Theory, Inverse, 01 natural sciences, Light scattering, Nuclear physics, Momentum, 0103 physical sciences, Neutron, Nuclear Experiment, 010306 general physics, Beam (structure)
Abstract

Background: For many years, quasifree scattering reactions in direct kinematics have been extensively used to study the structure of stable nuclei, demonstrating the potential of this approach. The (RB)-B-3 collaboration has performed a pilot experiment to study quasifree scattering reactions in inverse kinematics for a stable C-12 beam. The results from that experiment constitute the first quasifree scattering results in inverse and complete kinematics. This technique has lately been extended to exotic beams to investigate the evolution of shell structure, which has attracted much interest due to changes in shell structure if the number of protons or neutrons is varied. Purpose: In this work we investigate for the first time the quasifree scattering reactions (p, pn) and (p, 2p) simultaneously for the same projectile in inverse and complete kinematics for radioactive beams with the aim to study the evolution of single-particle properties from N = 14 to N = 15. Method: The structure of the projectiles O-23, O-22, and N-21 has been studied simultaneously via (p, pn) and (p, 2p) quasifree knockout reactions in complete inverse kinematics, allowing the investigation of proton and neutron structure at the same time. The experimental data were collected at the (RB)-B-3-LAND setup at GSI at beam energies of around 400 MeV/u. Two key observables have been studied to shed light on the structure of those nuclei: the inclusive cross sections and the corresponding momentum distributions. Conclusions: The knockout reactions (p, pn) and (p, 2p) with radioactive beams in inverse kinematics have provided important and complementary information for the study of shell evolution and structure. For the (p, pn) channels, indications of a change in the structure of these nuclei moving from N = 14 to N = 15 have been observed, i.e., from the 0d(5/2) shell to the 1s(1/2). This supports previous observations of a subshell closure at N = 14 for neutron-rich oxygen isotopes and its weakening for the nitrogen isotopes.

Published
2018

28. Quasifree ( p , 2p ) Reactions on Oxygen Isotopes: Observation of Isospin Independence of the Reduced Single-Particle Strength

Author

Rene Reifarth, J. Kahlbow, E. Y. Nikolskii, R. Thies, Jorge Machado, M. Heine, A. Estrade, Marina Petri, G. Ribeiro, J. Taylor, Daniel Bemmerer, M. A. Najafi, Haik Simon, M. Freer, Olof Tengblad, Enrique Casarejos, H. Alvarez-Pol, Kai Zuber, F. Farinon, C. Nociforo, D. Rossi, Nasser Kalantar-Nayestanaki, C. Wheldon, Thomas Aumann, K. Boretzky, L. Chulkov, Andreas Martin Heinz, C. Caesar, Vladimir Avdeichikov, Tanja Heftrich, J. M. Boillos, J. Hagdahl, V. Panin, D. Galaviz Redondo, Ángel Perea, T. Kröll, Joakim Cederkäll, A. Ignatov, Carlos A. Bertulani, N. Kurz, A. Hufnagel, M. Labiche, S. Pietri, V. Volkov, P. Díaz Fernández, Mikhail V. Zhukov, G. L. Wilson, Simon Lindberg, Carlo Barbieri, I. Syndikus, J. Benlliure, F. Wamers, M. Heil, Marine Vandebrouck, Catherine Rigollet, M. Caamaño, Enrique Nácher, H. Weick, S. Beceiro-Novo, C. Langer, O. Ershova, A. Kelic-Heil, P. Velho, A. Henriques, J. S. Winfield, Thomas Nilsson, A. Knyazev, E. Cravo, Håkan T Johansson, R. Crespo, María José García Borge, Pavel Golubev, O. Sorlin, H. Scheit, Marielle Chartier, M. Holl, Deniz Savran, I. Dillmann, Stefanos Paschalis, D. Yakorev, Y. Togano, J. Marganiec-Gałązka, T. Le Bleis, D. Cortina-Gil, Rituparna Kanungo, Hans Geissel, L. Atar, A. Movsesyan, L. M. Fraile, Björn Jonson, Philip Woods, Andreas Wagner, R. Gernhäuser, Andreas Zilges, J. Enders, R. Lemmon, M. Röder, Z. Elekes, K. Göbel, R. Plag, and W. N. Catford

Subjects
Physics, Range (particle radiation), 010308 nuclear & particles physics, Eikonal equation, media_common.quotation_subject, Nuclear Theory, Ab initio, General Physics and Astronomy, chemistry.chemical_element, 7. Clean energy, 01 natural sciences, Asymmetry, Oxygen, Isotopes of oxygen, Nuclear physics, chemistry, Isospin, 0103 physical sciences, Particle, Nuclear Experiment, 010306 general physics, media_common
Abstract

Quasifree one-proton knockout reactions have been employed in inverse kinematics for a systematic study of the structure of stable and exotic oxygen isotopes at the R3B/LAND setup with incident beam energies in the range of 300-450 MeV/u. The oxygen isotopic chain offers a large variation of separation energies that allows for a quantitative understanding of single-particle strength with changing isospin asymmetry. Quasifree knockout reactions provide a complementary approach to intermediate-energy one-nucleon removal reactions. Inclusive cross sections for quasifree knockout reactions of the type OA(p,2p)NA-1 have been determined and compared to calculations based on the eikonal reaction theory. The reduction factors for the single-particle strength with respect to the independent-particle model were obtained and compared to state-of-the-art ab initio predictions. The results do not show any significant dependence on proton-neutron asymmetry.

Published
2018

29. Missing-mass spectroscopy of the C12(p,d) reaction near the η′ -meson production threshold

Author

R. Knöbel, J. Zhao, Hans Geissel, Yasumoto Tanaka, Daisuke Jido, V. Metag, J. S. Winfield, H. Yamakami, J. Gellanki, C. Scheidenberger, M. Takechi, Y. Igarashi, Hooi Jin Ong, Imrich Szarka, C. Rappold, Yassid Ayyad, C. Guo, M. Iwasaki, Peter Strmen, Christine Hornung, Ryugo S. Hayano, K. Itahashi, R. Kanungo, Isao Tanihata, M.N. Harakeh, S. Terashima, Moritz P. Reiter, J. L. Rodriguez-Sanchez, N. Ikeno, E. Haettner, E. Widmann, Satoru Hirenzaki, E. Gutz, T. Nishi, X. Xu, Yuni N. Watanabe, S. Friedrich, K.-T. Brinkmann, Helmut Weick, Herbert A. Simon, Nasser Kalantar-Nayestanaki, I. G. Mukha, Y. Higashi, Bao-Hua Sun, Hideko Nagahiro, Ken Suzuki, Branislav Sitar, N. Kurz, J. Benlliure, Mariana Nanova, S. Pietri, Tomofumi Nagae, A. Prochazka, and Hiroyuki Fujioka

Subjects
Physics, 010308 nuclear & particles physics, Nuclear Theory, Momentum transfer, Eta meson, Mass spectrometry, 01 natural sciences, Particle identification, Spectral line, Nuclear physics, Deuterium, 0103 physical sciences, Bound state, Atomic physics, Nuclear Experiment, 010306 general physics, Spectroscopy
Abstract

Excitation-energy spectra of $^{11}\mathrm{C}$ nuclei near the ${\ensuremath{\eta}}^{\ensuremath{'}}$-meson production threshold have been measured by missing-mass spectroscopy using the $^{12}\mathrm{C}(p,d)$ reaction. A carbon target has been irradiated with a 2.5 GeV proton beam supplied by the synchrotron SIS-18 at GSI to produce ${\ensuremath{\eta}}^{\ensuremath{'}}$-meson bound states in $^{11}\mathrm{C}$ nuclei. Deuterons emitted at ${0}^{\ensuremath{\circ}}$ in the reaction have been momentum analyzed by the fragment separator (FRS), used as a high-resolution spectrometer. No distinct structure due to the formation of ${\ensuremath{\eta}}^{\ensuremath{'}}$-mesic states is observed although a high statistical sensitivity is achieved in the experimental spectra. Upper limits on the formation cross sections of ${\ensuremath{\eta}}^{\ensuremath{'}}$-mesic states are determined, and thereby a constraint imposed on the ${\ensuremath{\eta}}^{\ensuremath{'}}$-nucleus interaction is discussed.

Published
2018

30. Effective proton-neutron interaction near the drip line from unbound states in F25,26

Author

R. Crespo, Hans Geissel, Ralf Plag, J. Benlliure, Jason D. Holt, H. Hergert, Marine Vandebrouck, Christoph Langer, J. M. Boillos, Z. Elekes, J. Hagdahl, T. Kröll, J. Taylor, J. S. Winfield, A. Kelic-Heil, C. Caesar, Björn Jonson, Rene Reifarth, Roman Gernhäuser, A. Ignatov, D. M. Rossi, D. Galaviz, Joachim Enders, L. Chulkov, Deniz Savran, Ángel Perea, A. Lepailleur, F. Farinon, M. Heine, M. A. Najafi, Mikhail V. Zhukov, Nasser Kalantar-Nayestanaki, Andreas Wagner, T. Le Bleis, J. Kahlbow, Daniel Bemmerer, R. Kanungo, P. Velho, E. Y. Nikolskii, O. Sorlin, C. Wheldon, Thomas Aumann, M. Caamaño, D. Cortina-Gil, Stefanos Paschalis, Andreas Martin Heinz, L. Atar, Iris Dillmann, C. Nociforo, A. Henriques, R. Thies, Jorge Machado, O. Ershova, V. Panin, Marina Petri, Joakim Cederkäll, M. Holl, E. Cravo, Thomas Nilsson, A. Estrade, V. Volkov, W. N. Catford, Olof Tengblad, Vladimir Avdeichikov, Martin Freer, Marielle Chartier, F. Wamers, Simon Lindberg, M. J. G. Borge, Kai Zuber, Kathrin Göbel, Enrique Nácher, M. Röder, U. Datta Pramanik, Catherine Rigollet, H. Alvarez-Pol, Julien Gibelin, K. Boretzky, Yasuhiro Togano, M. Heil, I. Syndikus, L. M. Fraile, P. Díaz Fernández, A. Knyazev, S. R. Stroberg, S. Beceiro-Novo, Achim Schwenk, Tanja Heftrich, A. Movsesyan, D. Yakorev, A. Hufnagel, J. Marganiec, Helmut Weick, Håkan T Johansson, H. Scheit, Pavel Golubev, F. M. Marqués, Andreas Zilges, M. Labiche, G. L. Wilson, F. de Oliveira Santos, Carlos A. Bertulani, G. Ribeiro, P. J. Woods, S. Pietri, Enrique Casarejos, N. Kurz, Scott Bogner, Herbert A. Simon, and Roy Crawford Lemmon

Subjects
Physics, 010308 nuclear & particles physics, Binding energy, Ab initio, Resonance, 7. Clean energy, 01 natural sciences, Atomic mass, 0103 physical sciences, Bound state, Nuclear force, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Multiplet
Abstract

Background: Odd-odd nuclei, around doubly closed shells, have been extensively used to study proton-neutron interactions. However, the evolution of these interactions as a function of the binding energy, ultimately when nuclei become unbound, is poorly known. The F-26 nucleus, composed of a deeply bound pi 0d(5/2) proton and an unbound v0d(3/2) neutron on top of an O-24 core, is particularly adapted for this purpose. The coupling of this proton and neutron results in a J(pi) = 1(1)(+) - 4(1)(+) multiplet, whose energies must be determined to study the influence of the proximity of the continuum on the corresponding proton-neutron interaction. The J(pi) = 1(1)(+), 2(1)(+), 4(1)(+) bound states have been determined, and only a clear identification of the J(pi) = 3(1)(+) is missing. Purpose: We wish to complete the study of the J(pi) = 1(1)(+) - 4(1)(+) multiplet in F-26, by studying the energy and width of the J(pi) = 3(1)(+) unbound state. The method was first validated by the study of unbound states in F-25, for which resonances were already observed in a previous experiment. Method: Radioactive beams of Ne-26 and Ne-27, produced at about 440AMeV by the fragment separator at the GSI facility were used to populate unbound states in F-25 and F-26 via one-proton knockout reactions on a CH2 target, located at the object focal point of the (RB)-B-3/LAND setup. The detection of emitted. rays and neutrons, added to the reconstruction of the momentum vector of the A - 1 nuclei, allowed the determination of the energy of three unbound states in F-25 and two in F-26. Results: Based on its width and decay properties, the first unbound state in F-25, at the relative energy of 49(9) keV, is proposed to be a J(pi) = 1/ 2(-) arising from a p1/2 proton- hole state. In F-26, the first resonance at 323(33) keV is proposed to be the J(pi) = 3(1)(+) member of the J(pi) = 1(1)(+) - 4(1)(+) multiplet. Energies of observed states in F-25,F-26 have been compared to calculations using the independent-particle shell model, a phenomenological shell model, and the ab initio valence-space in-medium similarity renormalization group method. Conclusions: The deduced effective proton- neutron interaction is weakened by about 30-40% in comparison to the models, pointing to the need for implementing the role of the continuum in theoretical descriptions or to a wrong determination of the atomic mass of F-26.

Published
2017

31. Knockout and fragmentation reactions using a broad range of tin isotopes

Author

M. Caamaño, Hans Geissel, D. Pérez-Loureiro, A. Kelic-Heil, S. Pietri, Helmut Weick, J. S. Winfield, M. Takechi, Yu. A. Litvinov, Enrique Casarejos, J. Benlliure, J. Vargas, C. Paradela, A. Prochazka, D. Cortina-Gil, K. Boretzky, J. L. Rodriguez-Sanchez, J. Díaz-Cortes, Carlos A. Bertulani, M. Mostazo, H. Alvarez-Pol, Yassid Ayyad, S. Beceiro-Novo, J. Atkinson, A. Estrade, Thomas Aumann, and P. Díaz Fernández

Subjects
Physics, 010308 nuclear & particles physics, Nuclear Theory, Bench marking, 01 natural sciences, Nuclear physics, Fragmentation (mass spectrometry), 0103 physical sciences, Isotopes of tin, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Excitation
Abstract

Production cross sections of residual nuclei obtained by knockout and fragmentation reactions of different tin isotopes accelerated at 1A GeV have been measured with the fragment separator (FRS) at GSI, Darmstadt. The new measurements are used to investigate the neutron-excess dependence of the neutron- and proton-knockout cross sections. These cross sections are compared toGlauber model calculations coupled to a nuclear de-excitation code in order to investigate the role of the remnant excitations. This bench marking shows an overestimation of the cross sections for the removal of deeply bound nucleons. A phenomenological increase in the excitation energy induced in the remnants produced in these cases allows us to reproduce the measured cross sections.

Published
2017

32. β -decay half-lives and β -delayed neutron emission probabilities for several isotopes of Au, Hg, Tl, Pb, and Bi, beyond N=126

Author

Yu. A. Litvinov, I. Dillmann, K. Steiger, Karl Smith, Hans Geissel, G. Cortes, Carlos Guerrero, E. Wilson, J. L. Tain, A. R. García, Roman Gernhäuser, E. Sokol, H. Schaffner, N. Kurz, A. Evdokimov, C. Domingo-Pardo, Helmut Weick, S. Pietri, J. Benlliure, M. Marta, D. Cano-Ott, L. Maier, R. Caballero-Folch, J. Agramunt, F. Calviño, J. Kurcewicz, F. Montes, A. Algora, M. Bowry, T. Martinez, A. Prochazka, A. V. Yeremin, C. Paradela, J. Marganiec, F. Ameil, M. B. Gómez-Hornillos, D. Galaviz, R. Knöbel, Zs. Podolyák, Stephen Rice, B. Rubio, C. Nociforo, Bao-Hua Sun, I. Kojouharov, D. Testov, Yassid Ayyad, C. Scheidenberger, R. Wood, D. R. Napoli, Philip Woods, Matthias Heil, Ivan Mukha, W. Gelletly, F. Farinon, A. Riego, M. Takechi, C. Hinke, A. Estrade, J. S. Winfield, Thomas Faestermann, and Thomas Davinson

Subjects
Physics, Isotope, 010308 nuclear & particles physics, Branching fraction, 01 natural sciences, 7. Clean energy, Ion, 0103 physical sciences, Neutron detection, r-process, Neutron, Atomic physics, 010306 general physics, s-process, Delayed neutron
Abstract

Background: Previous measurements of Beta-delayed neutron emitters comprise around 230 nuclei, spanning from the 8He up to 150La. Apart from 210Tl, with a minuscule branching ratio of 0.07%, no other neutron emitter is measured yet beyond A = 150. Therefore new data are needed, particularly in the heavy mass region around N=126, in order to guide theoretical models and to understand the formation of the third r-process peak at A 195. Purpose: To measure both, Beta-decay half-lives and neutron branching ratios of several neutron-rich Au, Hg, Tl, Pb and Bi isotopes beyond N = 126. Method: Ions of interest are produced by fragmentation of a 238U beam, selected and identifed via the GSI-FRS fragment separator. A stack of segmented silicon detectors (SIMBA) is used to measure ion-implants and -decays. An array of 30 3He tubes embedded in a polyethylene matrix (BELEN) is used to detect neutrons with high efficiency and selectivity. A self-triggered digital system is employed to acquire data and to enable time-correlations. The latter are analyzed with an analytical model and results for the half-lives and neutron-branching ratios are derived using the binned Maximum-Likelihood method. Results: Twenty new Beta-decay half-lives are reported for 204

Published
2017

33. Accurate isotopic fission yields of electromagnetically induced fission of U238 measured in inverse kinematics at relativistic energies

Author

Andreas Martin Heinz, K.-H. Schmidt, Helmut Weick, S. Pietri, Håkan T Johansson, J. Vargas, D. Cortina-Gil, B. Jurado, C. Paradela, B. Laurent, L. Audouin, A. Kelic-Heil, A. Ebran, G. Belier, J. L. Rodriguez-Sanchez, Y. Ayyad, J. Benlliure, A. Chatillon, F. Farget, J. Taieb, E. Pellereau, G. Boutoux, T. Gorbinet, C. Nociforo, J. F. Martin, B. Fernández-Domínguez, L. Tassan-Got, E. Casarejos, H. Alvarez-Pol, L. Grente, Herbert A. Simon, N. Kurz, Bernd Voss, and M. Caamaño

Subjects
Physics, Range (particle radiation), Inverse kinematics, 010308 nuclear & particles physics, Fission, Nuclear Theory, 01 natural sciences, 7. Clean energy, Coincidence, Effective nuclear charge, Nuclear physics, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Physics::Accelerator Physics, Nuclear Experiment, 010306 general physics
Abstract

SOFIA (Studies On Fission with Aladin) is a novel experimental program, dedicated to accurate measurements of fission-fragment isotopic yields. The setup allows us to fully identify, in nuclear charge and mass, both fission fragments in coincidence for the whole fission-fragment range. It was installed at the GSI facility (Darmstadt), to benefit from the relativistic heavy-ion beams available there, and thus to use inverse kinematics. This paper reports on fission yields obtained in electromagnetically induced fission of U238.

Published
2017

34. Isotopic production cross sections of residual nuclei in the spallation reactionXe136(200AMeV)+p

Author

V. Henzl, C. Stephan, A. Lafriaskh, Enrique Casarejos, A. Kelic-Heil, J.E. Ducret, K.-H. Schmidt, Andreas Martin Heinz, L. Giot, M. Fernández Ordóñez, J. Benlliure, A. Boudard, C. Volant, C. Schmitt, O. Yordanov, C. Villagrasa, B. Fernández-Domínguez, S. Leray, D. Henzlova, D. Pérez-Loureiro, M. V. Ricciardi, P. Napolitani, F. Farget, J. Pereira, T. Enqvist, L. Tassan-Got, C. Paradela, L. Audouin, and J. L. Rodriguez-Sanchez

Subjects
Physics, Spectrometer, 010308 nuclear & particles physics, Projectile, Nuclear Theory, chemistry.chemical_element, Residual, 01 natural sciences, Nuclear physics, chemistry, Cascade, Caesium, 0103 physical sciences, Physics::Accelerator Physics, Neutron source, Spallation, Atomic physics, Nuclear Experiment, 010306 general physics, Radioactive beam
Abstract

The residual nuclei produced in the spallation reaction of Xe-136 nuclei at 200A MeV on protons have been studied by measuring the isotopic distributions for the elements from cadmium (Z = 48) to cesium (Z = 55) by using the fragment separator (FRS) spectrometer at GSI and the inverse kinematics technique. This is one of the few measurements performed at such a low projectile energy, close to the validity limit for intranuclear cascade models such as INCL or ISABEL. The experimental results have been compared to these intranuclear cascade codes coupled to the evaporation code ABLA. Both code combinations reproduce qualitatively the measured isotopic distributions; however, both underestimate the production of residues with mass numbers between 126 and 134. The measured cross sections are of interest for the planning of future radioactive beam or neutron source facilities.

Published
2017

35. High-precision measurement of isotopic fission yields of $^{236}$U

Author

S. Pietri, B. Jurado, Herbert A. Simon, M. Caamaño, B. Löher, L. Grente, C. Paradela, F. Farget, A. Chatillon, L. Audouin, Simon Lindberg, G. Boutoux, B. Laurent, G. Belier, Enrique Casarejos, H. Alvarez-Pol, K.-H. Schmidt, C. Rodriguez-Tajes, N. Kurz, J. L. Rodriguez-Sanchez, J. F. Martin, D. Ramos, Andreas Martin Heinz, L. Tassan-Got, D. M. Rossi, J. Benlliure, Bernd Voss, C. Nociforo, H. Törnqvist, A. Kelic-Heil, Y. Yan, D. Cortina-Gil, Helmut Weick, Håkan T Johansson, Y. Ayyad, T. Gorbinet, B. Fernández-Domínguez, J. Taieb, 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), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Inverse kinematics, Spectrometer, 010308 nuclear & particles physics, Fission, QC1-999, Nuclear data, Charge (physics), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, Recoil, 0103 physical sciences, 010306 general physics, Spectroscopy, Nuclear Experiment, Beam (structure)
Abstract

We report on the second SOFIA experiment, dedicated to the fission yields of 236U*, analog to 235U(n,f). The measurement is based on the inverse kinematics method, using a relativistic, secondary beam of 236U. Both fission fragments are identified in mass and charge in the SOFIA recoil spectrometer. The obtained isotopic yields are compared with existing spectroscopy measurements and the elemental yields are used to discuss the treatment of the even-odd effect with energy in nuclear data libraries.

Published
2017

36. Spallation-induced fission reactions

Author

J. Benlliure and J. L. Rodriguez-Sanchez

Subjects
010308 nuclear & particles physics, Fission, Nuclear engineering, General Physics and Astronomy, 01 natural sciences, Nuclear physics, Scientific method, 0103 physical sciences, Physics::Accelerator Physics, Environmental science, Spallation, Nuclear Experiment, 010306 general physics, Radioactive beam
Abstract

During the last decade spallation-induced fission reactions have received particular attention because of their impact in the design of spallation-neutron sources or radioactive beam facilities, but also in the understanding of the fission process at high excitation energy. In this paper, we review the main progress brought by modern experimental techniques, in particular those based in the inverse kinematic, as well as the achievements in modelling these reactions. We will also address future possibilities for improving the investigation of fission dynamics.

Published
2017

37. Determination of the neutron-capture rate of C17 for r -process nucleosynthesis

Author

Håkan T Johansson, Pavel Golubev, Enrique Casarejos, T. Adachi, J. Van de Walle, Ethan Uberseder, G. L. Wilson, Y. Aksyutina, S. Beceiro-Novo, J. Enders, Ángel Perea, F. Farinon, C. Langer, R. Knöbel, J. Benlliure, O. Lepyoshkina, Marielle Chartier, A. Kelic-Heil, F. Wamers, N. I. Ashwood, A. Najafi, M. Barr, Kai Zuber, J. Alcantara, Tanja Heftrich, T. Le Bleis, A. Henriques, G. Ickert, J. S. Winfield, D. Cortina-Gil, Thomas Nilsson, G. Ribeiro, Hans Geissel, S. Pietri, Haik Simon, M. Freer, Anisur Rahaman, C. Caesar, Olof Tengblad, C. Nociforo, Stefanos Paschalis, O. Ershova, D. Rossi, Y. Togano, Stefan Typel, S. Chakraborty, A. Movsesyan, O. Sorlin, K. Boretzky, K. Riisager, P. Díaz Fernández, Andreas Zilges, A. Ignatov, Meng-Ru Wu, P. Velho, Vladimir Avdeichikov, Simon Lindberg, A. Prochazka, Catherine Rigollet, Mario Weigand, M. Caamaño, B. Streicher, J. Taylor, Z. Elekes, W. N. Catford, S. Terashima, K. Göbel, V. Panin, Bo Jakobsson, M. Heil, J. Hagdahl, Carlos A. Bertulani, M. V. Ricciardi, Björn Jonson, Philip Woods, M. Labiche, M. Freudenberger, L. M. Fraile, R. Plag, U. Datta Pramanik, S. Altstadt, Gabriel Martínez-Pinedo, R. Thies, Jorge Machado, T. Neff, Marina Petri, R. Crespo, H. Weick, M. Holl, J. Kurcewicz, Andreas Wagner, H. Scheit, H. Alvarez-Pol, R. Gernhäuser, H. O. U. Fynbo, Nasser Kalantar-Nayestanaki, G. Rastrepina, J. Sanchez del Rio, D. Galaviz, C. Wheldon, Thomas Aumann, Deniz Savran, N. Kurz, Andreas Martin Heinz, M. Röder, T. Kröll, V. Stoica, M. Mostazo, V. Volkov, M. Heine, Daniel Bemmerer, I. Dillmann, Joakim Cederkäll, D. Yakorev, Mikhail V. Zhukov, V. Maroussov, A. Estrade, J. Marganiec, Rene Reifarth, G. Burgunder, Roy Crawford Lemmon, C. Wimmer, Rituparna Kanungo, L. Chulkov, R. Krücken, D. Gonzalez Diaz, and María José García Borge

Subjects
Physics, education.field_of_study, 010308 nuclear & particles physics, Population, 7. Clean energy, 01 natural sciences, Spectral line, Nuclear physics, Neutron capture, Nucleosynthesis, Excited state, 0103 physical sciences, Coulomb, r-process, Atomic physics, Nuclear Experiment, 010306 general physics, education, Ground state
Abstract

With the R$^{3}$B-LAND setup at GSI we have measured exclusive relative-energy spectra of the Coulomb dissociation of $^{18}$C at a projectile energy around 425~AMeV on a lead target, which are needed to determine the radiative neutron-capture cross sections of $^{17}$C into the ground state of $^{18}$C. Those data have been used to constrain theoretical calculations for transitions populating excited states in $^{18}$C. This allowed to derive the astrophysical cross section $\sigma^{*}_{\mathrm{n}\gamma}$ accounting for the thermal population of $^{17}$C target states in astrophysical scenarios. The experimentally verified capture rate is significantly lower than those of previously obtained Hauser-Feshbach estimations at temperatures $T_{9}\leq{}1$~GK. Network simulations with updated neutron-capture rates and hydrodynamics according to the neutrino-driven wind model as well as the neutron-star merger scenario reveal no pronounced influence of neutron capture of $^{17}$C on the production of second- and third-peak elements in contrast to earlier sensitivity studies.

Published
2017

38. Probing the Symmetry Term of the Nuclear Equation of State at High Baryonic Densities

Author

M. Trimarchi, A. Chbihi, Piotr Pawłowski, G. Lanzalone, Riccardo Introzzi, Roy Crawford Lemmon, S. Kupny, Yongjia Wang, Z. Matthews, F. Amorini, Marielle Chartier, M. Zoric, J. Brzychczyk, Chiara Guazzoni, F. Rizzo, N. Kurz, H. H. Wolter, Matthias Heil, M. Al-Garawi, D. M. Rossi, Zbigniew Sosin, P. Z. Wu, Maria Colonna, A. Budzanowski, Qingfeng Li, Yassid Ayyad, W. G. Lynch, Abdulrahman Alajlan, F. Porto, M. Mostazo, Sherry Yennello, Herbert A. Simon, P. Wigg, Giuseppe Verde, P. Cammarata, Lauren Heilborn, D. G. Sarantites, S. Al-Homaidhi, E. V. Pagano, S. Santoro, Mariano Vigilante, W. Reviol, A. Pagano, P. Guazzoni, S. Pirrone, L. Stuhl, T. Isobe, E. La Guidara, P. Lasko, K. Kezzar, J. Łukasik, L. Zetta, P. Russotto, L. Grassi, Michael Famiano, J. Benlliure, A. Wieloch, M. Boisjoli, I. Skwirczyńska, W. Trautmann, S. Gannon, Igor Gašparić, Jack Winkelbauer, Elio Rosato, A. Le Fèvre, Thomas Aumann, M. Kiš, P. Zambon, Z. Chajecki, Michele Papa, M. Adamczyk, Ivano Lombardo, M. B. Tsang, M. D. Cozma, A. Trifirò, Martin Veselsky, F. Riccio, Luis Acosta, Yvonne Leifels, E. De Filippo, K. Boretzky, L. W. May, Lucrezia Auditore, C. Caesar, G. Politi, M. Di Toro, B. Czech, Attila Krasznahorkay, G. Cardella, Paola Marini, Triestino Minniti, Zoran Basrak, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre 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), Russotto, P., Acosta, L., Adamczyk, M., Al-Ajlan, A., Al-Garawi, M., Al-Homaidhi, S., Amorini, F., Auditore, L., Aumann, T., Ayyad, Y., Basrak, Z., Benlliure, J., Boisjoli, M., Boretzky, K., Brzychczyk, J., Budzanowski, A., Caesar, C., Cardella, G., Cammarata, P., Chajecki, Z., Chartier, M., Chbihi, A., Colonna, M., Cozma, M. D., Czech, B., De Filippo, E., Di Toro, M., Famiano, M., Gannon, S., Gašparić, I., Grassi, L., Guazzoni, C., Guazzoni, P., Heil, M., Heilborn, L., Introzzi, R., Isobe, T., Kezzar, K., Kiš, M., Krasznahorkay, A., Kupny, S., Kurz, N., La Guidara, E., Lanzalone, G., Lasko, P., Le Fèvre, A., Leifels, Y., Lemmon, R. C., Li, Q. F., Lombardo, I., Łukasik, J., Lynch, W. G., Marini, P., Matthews, Z., May, L., Minniti, T., Mostazo, M., Pagano, A., Pagano, E. V., Papa, M., Pawłowski, P., Pirrone, S., Politi, G., Porto, F., Reviol, W., Riccio, F., Rizzo, F., Rosato, E., Rossi, D., Santoro, S., Sarantites, D. G., Simon, H., Skwirczynska, I., Sosin, Z., Stuhl, L., Trautmann, W., Trifirò, A., Trimarchi, M., Tsang, M. B., Verde, G., Veselsky, M., Vigilante, M., Wang, Yongjia, Wieloch, A., Wigg, P., Winkelbauer, J., Wolter, H. H., Wu, P., Yennello, S., Zambon, P., Zetta, L., and Zoric, M.

Subjects
Physics, Linear density, History, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Nuclear Theory, Nuclear equation of state, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Charged particle, Symmetry (physics), Computer Science Applications, Education, Term (time), Nuclear physics, Baryon, Physics and Astronomy (all), symmetry energy, neutron flow, nuclear equation of state, heavy-ion scattering, relativistic quantum molecular dynamics, Darmstadt GSI FAIR, density dependence, transport theory, elliptic flow, 0.4 GeV/nucleon, Quantum electrodynamics, 0103 physical sciences, Neutron, 010306 general physics, Nucleon, Nuclear Experiment
Abstract

International audience; In the ASY-EOS experiment flows of neutrons and light charged particles were measured for (197)Au+(197)Au collisions at 400 MeV/nucleon, in order to investigate the strength of the symmetry term of the nuclear equation of state at supra-saturation densities. By comparing the experimental data with the UrQMD transport model predictions, we have extracted a new constraint in agreement with the moderately soft to linear density dependence obtained in the former analysis on FOPI-LAND data, but reducing the associated uncertainty by a factor ∼ 2.

Published
2017

39. Presaddle and postsaddle dissipative effects in fission using complete kinematics measurements

Author

C. Paradela, L. Audouin, J. Taieb, T. Gorbinet, J. Benlliure, D. M. Rossi, Herbert A. Simon, Bernd Voss, D. Ramos, D. Cortina-Gil, C. Rodriguez-Tajes, J. L. Rodriguez-Sanchez, Enrique Casarejos, J. F. Martin, B. Laurent, Andreas Martin Heinz, H. Alvarez-Pol, A. Chatillon, G. Boutoux, A. Kelic-Heil, E. Pellereau, B. Pietras, G. Belier, J. Vargas, Yassid Ayyad, 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 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), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre 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 Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Inverse kinematics, 010308 nuclear & particles physics, Fission, Nuclear Theory, Kinematics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Dissipation, 7. Clean energy, 01 natural sciences, Nuclear physics, 0103 physical sciences, Physics::Atomic and Molecular Clusters, ddc:530, Neutron, Spallation, Atomic number, Nuclear Experiment, 010306 general physics, Excitation
Abstract

International audience; A complete kinematics measurement of the two fission fragments was used for the first time to investigatefission dynamics at small and large deformations. Fissioning systems with high excitation energies, compactshapes, and low angular momenta were produced in inverse kinematics by using spallation reactions of leadprojectiles. A new generation experimental setup allowed for the first full and unambiguous identification inmass and atomic number of both fission fragments. This measurement permitted us to accurately determinefission cross sections, the charge distribution, and the neutron excess of the fission fragments as a function of theatomic number of the fissioning system. These data are compared with different model calculations to extractinformation on the value of the dissipation parameter at small and large deformations. The present results do notshow any sizable dependence of the nuclear dissipation parameter on temperature or deformation.

Published
2016

40. Isotopic production cross sections of the residual nuclei in spallation reactions induced by 136Xe projectiles on proton at 500 A MeV

Author

Alain Boudard, Andreas Martin Heinz, T. Enqvist, Enrique Casarejos, F. Farget, Daniela Henzlova, C. Villagrasa, M. Fernández Ordóñez, S. Leray, C. Schmitt, J. Benlliure, B. Fernández-Domínguez, C. Volant, J.E. Ducret, M. V. Ricciardi, K.-H. Schmidt, C. Stéphan, V. Henzl, P. Napolitani, O. Yordanov, L. Tassan-Got, C. Paradela, L. Audouin, D. Pérez-Loureiro, J. Pereira, A. Lafriaskh, A. Kelic-Heil, Juan Antonio Alcantara-Nunez, L. Giot, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), 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), 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), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear reaction, Nuclear and High Energy Physics, Proton, Nuclear Theory, E = 500 MeV/nucleon, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Residual, Ba presented also in tabular form. Compared with published data at 1000 MeV/nucleon, 7. Clean energy, 01 natural sciences, charge using FRS magnetic spectrometer, Nuclear physics, Momentum, Xe, 0103 physical sciences, longitudinal momentum distributions. Resulting σ for Sn, Spallation, deduced fragment isotopes yields, Cs, Nuclear Experiment, 010306 general physics, Liquid hydrogen, X), Te, Physics, NUCLEAR REACTIONS 1H(136Xe, Spectrometer, measured spallation products mass, 010308 nuclear & particles physics, Projectile, production σ, Physics::Accelerator Physics, Atomic physics, Sb
Abstract

The experiment was performed at the GSI facility in Darmstadt (Germany).; Around 270 medium-mass residual nuclei, formed in spallation reactions induced by 136Xe projectiles impinging on a liquid hydrogen target at 500 AMeV, have been unambiguously identified at GSI using the magnetic spectrometer FRS. The individual production cross sections and the longitudinal momentum distributions have been determined with high accuracy. These data represent an important constraint for theoretical models describing spallation reactions.

Published
2013

41. Measurement of Excitation Spectra in the C12(p,d) Reaction near the η′ Emission Threshold

Author

Helmut Weick, Y. Higashi, H. Fujioka, Satoru Hirenzaki, J. Zhao, A. Prochazka, E. Widmann, Ken Suzuki, S. Friedrich, Nasser Kalantar-Nayestanaki, R. Knöbel, X. Xu, S. Pietri, Herbert A. Simon, V. Metag, J. Gellanki, K. Itahashi, Imrich Szarka, C. Rappold, Christine Hornung, J. S. Winfield, Isao Tanihata, Rituparna Kanungo, E. Haettner, Daisuke Jido, M.N. Harakeh, Satoru Terashima, Moritz P. Reiter, J. L. Rodriguez-Sanchez, Mariana Nanova, Yasumoto Tanaka, M. Iwasaki, H. Yamakami, T. Nishi, Bao-Hua Sun, Hideko Nagahiro, Yassid Ayyad, E. Gutz, I. G. Mukha, Hooi Jin Ong, Tomofumi Nagae, Yuni N. Watanabe, N. Ikeno, K.-T. Brinkmann, Y. Igarashi, Maya Takechi, Hans Geissel, Branislav Sitar, N. Kurz, C. Guo, Ryugo S. Hayano, C. Scheidenberger, J. Benlliure, and Peter Strmen

Subjects
Physics, Spectrometer, Proton, 010308 nuclear & particles physics, Nuclear Theory, General Physics and Astronomy, chemistry.chemical_element, 01 natural sciences, Spectral line, Synchrotron, law.invention, chemistry, Deuterium, law, 0103 physical sciences, Bound state, Atomic physics, Nuclear Experiment, 010306 general physics, Carbon, Beam (structure)
Abstract

Excitation spectra of ^{11}C are measured in the ^{12}C(p,d) reaction near the η^{'} emission threshold. A proton beam extracted from the synchrotron SIS-18 at GSI with an incident energy of 2.5 GeV impinges on a carbon target. The momenta of deuterons emitted at 0° are precisely measured with the fragment separator (FRS) operated as a spectrometer. In contrast to theoretical predictions on the possible existence of deeply bound η^{'}-mesic states in carbon nuclei, no distinct structures are observed associated with the formation of bound states. The spectra are analyzed to set stringent constraints on the formation cross section and on the hitherto barely known η^{'}-nucleus interaction.

Published
2016

42. Dissipative effects in fission investigated in complete kinematics measurements

Author

Enrique Casarejos, A. Chatillon, B. Laurent, G. Boutoux, A. Kelic-Heil, B. Pietras, Andreas Martin Heinz, J. L. Rodriguez-Sanchez, G. Belier, J. Benlliure, C. Rodriguez-Tajes, Yassid Ayyad, Herbert A. Simon, D. M. Rossi, C. Paradela, L. Audouin, E. Pellereau, J. Vargas, D. Cortina-Gil, Bernd Voss, T. Gorbinet, H. Alvarez-Pol, D. Ramos, J. F. Martin, J. Taieb, Universidade de Santiago de Compostela [Spain] (USC ), USC, Universidad de Santiago de Compostela, Universidad Santiago de Compostela, Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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'Études de Limeil-Valenton (CEA-DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), A. Plompen, F.-J. Hambsch, P. Schillebeeckx, W. Mondelaers, J. Heyse, S. Kopecky, P. Siegler and S. Oberstedt, and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Mass number, Physics, Angular momentum, Mass distribution, 010308 nuclear & particles physics, Fission, QC1-999, Nuclear Theory, Dissipation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, 0103 physical sciences, Dissipative system, Physics::Atomic and Molecular Clusters, Spallation, Neutron, 010306 general physics, Nuclear Experiment
Abstract

International audience; The study of dissipative effects in fission has been carried out with fusion-fission reactions by using a limited number of observables, such as the fission probabilities, the mass distribution of the fission fragments, or the neutron multiplicities. However, the large angular momenta gained by the compound nucleus in this kind of reaction could affect the conclusions drawn from such experiments. In this work, we propose to investigate the fission dynamics by the use of spallation reactions on 208Pb because the fissioning systems are produced with low angular momentum, small deformations, and high excitation energies, enhancing the dissipative effects. The complete kinematics measurements of the fission fragments and light-charged particles were performed by the use of the SOFIA setup combined with the inverse kinematics technique, allowing us for the first time a full indentification in atomic and mass number of the two fission fragments. These measurements permit us to define new fission observables for the investigation of the temperature and deformation dependencies of the dissipation parameter.

Published
2016

43. Excitation-energy influence at the scission configuration

Author

D. Ramos, C. Rodríguez-Tajes, M. Caamaño, F. Farget, L. Audouin, J. Benlliure, E. Casarejos, E. Clement, D. Cortina, O. Delaune, X. Derkx, A. Dijon, D. Doré, B. Fernández-Domínguez, G. de France, A. Heinz, B. Jacquot, A. Navin, C. Paradela, M. Rejmund, T. Roger, M.-D. Salsac, C. Schmitt, 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), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Joint Research Centre, European Commission, A. Plompen, F.-J. Hambsch, P. Schillebeeckx, W. Mondelaers, J. Heyse, S. Kopecky, P. Siegler, S. Oberstedt, 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 Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear reaction, 010308 nuclear & particles physics, Fission, QC1-999, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Effective nuclear charge, Nuclear physics, Uranium-238, Nuclear fission, 0103 physical sciences, Nuclear fusion, Neutron, Atomic physics, 010306 general physics, Nuclear Experiment, Excitation
Abstract

The conference in EPJ Web of Conferences entitled "ND 2016 International Conference on Nuclear Data for Science and Technology", ISBN: 978-2-7598-9020-0; International audience; Transfer-and fusion-induced fission in inverse kinematics was proven to be a powerful tool to investigate nuclear fission, widening the information of the fission fragments and the access to unstable fissioning systems with respect to other experimental approaches. An experimental campaign for fission investigation has being carried out at GANIL with this technique since 2008. In these experiments, a beam of 238 U, accelerated to 6.1 MeV/u, impinges on a 12 C target. Fissioning systems from U to Cf are populated through transfer and fusion reactions, with excitation energies that range from few MeV up to 46 MeV. The use of inverse kinematics, the SPIDER telescope, and the VAMOS spectrometer permitted the characterization of the fissioning system in terms of mass, nuclear charge, and excitation energy, and the isotopic identification of the full fragment distribution. The neutron excess, the total neutron multiplicity, and the even-odd staggering in the nuclear charge of fission fragments are presented as a function of the excitation energy of the fissioning system. Structure effects are observed at Z∼50 and Z∼55, where their impact evolves with the excitation energy.

Published
2016

44. Results of the ASY-EOS experiment at GSI: The symmetry energy at suprasaturation density

Author

S. Al-Homaidhi, Abdulrahman Alajlan, A. Wieloch, F. Amorini, Angelo Pagano, Marielle Chartier, E. Rosato, Roy Crawford Lemmon, D. G. Sarantites, S. Kupny, Z. Chajecki, Martin Veselsky, Tadaaki Isobe, M. B. Tsang, F. Riccio, Z. Basrak, Triestino Minniti, A. Chbihi, G. Cardella, P. Zambon, Piotr Pawłowski, J. Benlliure, Giuseppe Verde, Michele Papa, M. Adamczyk, L. Stuhl, Marina Trimarchi, M.D. Cozma, J. Brzychczyk, A. Trifirò, E. De Filippo, C. Caesar, Z. Matthews, Maria Colonna, Lauren Heilborn, F. Rizzo, S. Santoro, N. Kurz, S. Pirrone, S. Gannon, H. H. Wolter, M. Kiš, Luis Acosta, P. Cammarata, Igor Gašparić, Jack Winkelbauer, P. Lasko, Michael Heil, E. La Guidara, Y. Leifels, A. Le Fèvre, A. Krasznahorkay, K. Boretzky, M. Di Toro, B. Czech, I. Lombardo, Thomas Aumann, P. Wigg, E. V. Pagano, M. Boisjoli, K. Kezzar, Paola Marini, W. Reviol, P. Guazzoni, Michael Famiano, I. Skwirczyńska, L. Zetta, P. Russotto, Sherry Yennello, F. Porto, M. Mostazo, W. G. Lynch, H. Simon, M. Zoric, Riccardo Introzzi, M. Al-Garawi, P. Z. Wu, Yassid Ayyad, J. Łukasik, L. Grassi, Chiara Guazzoni, A. Budzanowski, D. M. Rossi, Zbigniew Sosin, Qingfeng Li, Mariano Vigilante, W. Trautmann, G. Lanzalone, Yongjia Wang, L. W. May, Lucrezia Auditore, G. Politi, 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), 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), Russotto, P., Gannon, S., Kupny, S., Lasko, P., Acosta, L., Adamczyk, M., Al-Ajlan, A., Al-Garawi, M., Al-Homaidhi, S., Amorini, F., Auditore, L., Aumann, T., Ayyad, Y., Basrak, Z., Benlliure, J., Boisjoli, M., Boretzky, K., Brzychczyk, J., Budzanowski, A., Caesar, C., Cardella, G., Cammarata, P., Chajecki, Z., Chartier, M., Chbihi, A., Colonna, M., Cozma, M. D., Czech, B., De Filippo, E., Di Toro, M., Famiano, M., Gašparić, I., Grassi, L., Guazzoni, C., Guazzoni, P., Heil, M., Heilborn, L., Introzzi, R., Isobe, T., Kezzar, K., Kiš, M., Krasznahorkay, A., Kurz, N., La Guidara, E., Lanzalone, G., Le Fèvre, A., Leifels, Y., Lemmon, R. C., Li, Q. F., Lombardo, I., Łukasik, J., Lynch, W. G., Marini, P., Matthews, Z., May, L., Minniti, T., Mostazo, M., Pagano, A., Pagano, E. V., Papa, M., Pawłowski, P., Pirrone, S., Politi, G., Porto, F., Reviol, W., Riccio, F., Rizzo, F., Rosato, E., Rossi, D., Santoro, S., Sarantites, D. G., Simon, H., Skwirczynska, I., Sosin, Z., Stuhl, L., Trautmann, W., Trifirò, A., Trimarchi, M., Tsang, M. B., Verde, G., Veselsky, M., Vigilante, M., Wang, Yongjia, Wieloch, A., Wigg, P., Winkelbauer, J., Wolter, H. H., Wu, P., Yennello, S., Zambon, P., Zetta, L., and Zoric, M.

Subjects
Physics, Nuclear and High Energy Physics, sezele, 010308 nuclear & particles physics, Elliptic flow, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Charged particle, Symmetry (physics), Nuclear physics, symmetry energy, neutron flow, nuclear equation of state, heavy-ion scattering, relativistic quantum molecular dynamics, Darmstadt GSI FAIR, density dependence, transport theory, elliptic flow, 0.4 GeV/nucleon, 0103 physical sciences, HEAVY-ION COLLISIONS, EQUATION-OF-STATE, MASS-RADIUS RELATION, COLLECTIVE FLOW, PION-PRODUCTION, NEUTRON, DEPENDENCE, FRAGMENTATION, SYSTEMATICS, EMISSION, Large Area Neutron Detector, Neutron, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, Nucleon, Event (particle physics), Parametrization
Abstract

Directed and elliptic flows of neutrons and light charged particles were measured for the reaction 197Au+197Au at 400 MeV/nucleon incident energy within the ASY-EOS experimental campaign at the GSI laboratory. The detection system consisted of the Large Area Neutron Detector LAND, combined with parts of the CHIMERA multidetector, of the ALADIN Time-of-flight Wall, and of the Washington-University Microball detector. The latter three arrays were used for the event characterization and reaction-plane reconstruction. In addition, an array of triple telescopes, KRATTA, was used for complementary measurements of the isotopic composition and flows of light charged particles. From the comparison of the elliptic flow ratio of neutrons with respect to charged particles with UrQMD predictions, a value \gamma = 0.72 \pm 0.19 is obtained for the power-law coefficient describing the density dependence of the potential part in the parametrization of the symmetry energy. It represents a new and more stringent constraint for the regime of supra-saturation density and confirms, with a considerably smaller uncertainty, the moderately soft to linear density dependence deduced from the earlier FOPI-LAND data. The densities probed are shown to reach beyond twice saturation., Comment: 25 pages, 22 figures, accepted for publication in Physical Review C

Published
2016

45. Light charged particles emitted in fission reactions induced by protons onPb208

Author

A. Kelic-Heil, J. Vargas, D. Cortina-Gil, Herbert A. Simon, B. Laurent, H. Alvarez-Pol, B. Pietras, J. Benlliure, G. Belier, J. F. Martin, Y. Ayyad, E. Pellereau, A. Chatillon, T. Gorbinet, G. Boutoux, C. Rodriguez-Tajes, D. M. Rossi, Bernd Voss, J. L. Rodriguez-Sanchez, E. Casarejos, C. Paradela, L. Audouin, Andreas Martin Heinz, D. Ramos, and J. Taieb

Subjects
Physics, Cold fission, Cluster decay, 010308 nuclear & particles physics, Fission, Nuclear Theory, Observable, Dissipation, Kinetic energy, 01 natural sciences, 7. Clean energy, Charged particle, Nuclear physics, Nuclear fission, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

Light charged particles emitted in proton-induced fission reactions on Pb-208 have been measured at different kinetic energies: 370A, 500A, and 650A MeV. The experiment was performed by the SOFIA Collaboration at the GSI facilities in Darmstadt (Germany). The inverse kinematics technique was combined with a setup especially designed to measure light charged particles in coincidence with fission fragments. This measurement allowed us, for the first time, to obtain correlations between the light charged particles emitted during the fission process and the charge distributions of the fission fragments. These correlations were compared with different model calculations to assess the ground-to-saddle dynamics. The results confirm that transient and dissipative effects are required for an accurate description of the fission observables.

Published
2016

46. The symmetry energy at suprasaturation density and the ASY-EOS experiment at GSI

Author

S. Santoro, P. Lasko, Luis Acosta, D. G. Sarantites, S. Al-Homaidhi, K. Boretzky, Giuseppe Verde, F. Porto, S. Pirrone, Z. Chajecki, E. V. Pagano, D. M. Rossi, Zbigniew Sosin, Qingfeng Li, A. Wieloch, Sherry Yennello, F. Rizzo, L. Stuhl, M. B. Tsang, L. Zetta, Roy Crawford Lemmon, S. Kupny, Maria Colonna, M. Kiš, Martin Veselsky, P. Zambon, C. Caesar, F. Riccio, P. Cammarata, Yvonne Leifels, I. Skwirczyńska, J. Benlliure, Marina Trimarchi, Chiara Guazzoni, Mariano Vigilante, A. Trifirò, P. Russotto, Z. Basrak, A. Chbihi, L. W. May, W. Trautmann, M. Di Toro, Piotr Pawłowski, B. Czech, E. La Guidara, M.D. Cozma, W. Reviol, A. Pagano, P. Guazzoni, H. H. Wolter, Michael Famiano, J. Brzychczyk, E. De Filippo, M. Al-Garawi, G. Cardella, G. Lanzalone, Z. Matthews, Igor Gašparić, Jack Winkelbauer, W. G. Lynch, A. Budzanowski, N. Kurz, L. Grassi, M. Mostazo, A. Le Fèvre, Elio Rosato, Paola Marini, M. Zoric, Thomas Aumann, A. Krasznahorkay, Herbert A. Simon, Riccardo Introzzi, Yongjia Wang, P. Wigg, K. Kezzar, Abdulrahman Alajlan, J. Łukasik, P. Z. Wu, Yassid Ayyad, Triestino Minniti, Ivano Lombardo, Lucrezia Auditore, G. Politi, M. Boisjoli, F. Amorini, Marielle Chartier, Lauren Heilborn, Tadaaki Isobe, Matthias Heil, Michele Papa, M. Adamczyk, S. Gannon, 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 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), De Filippo, E., Russotto, P., Acosta, L., Adamczyk, M., Al-Ajlan, A., Al-Garawi, M., Al-Homaidhi, S., Amorini, F., Auditore, L., Aumann, T., Ayyad, Y., Basrak, Z., Benlliure, J., Boisjoli, M., Boretzky, K., Brzychczyk, J., Budzanowski, A., Caesar, C., Cardella, G., Cammarata, P., Chajecki, Z., Chartier, M., Chbihi, A., Colonna, M., Cozma, M. D., Czech, B., Di Toro, M., Famiano, M., Gannon, S., Gašparić, I., Grassi, L., Guazzoni, C., Guazzoni, P., Heil, M., Heilborn, L., Introzzi, R., Isobe, T., Kezzar, K., Kiš, M., Krasznahorkay, A., Kupny, S., Kurz, N., La Guidara, E., Lanzalone, G., Lasko, P., Le Fèvre, A., Leifels, Y., Lemmon, R. C., Li, Q. F., Lombardo, I., Łukasik, J., Lynch, W. G., Marini, P., Matthews, Z., May, L., Minniti, T., Mostazo, M., Pagano, A., Pagano, E. V., Papa, M., Pawłowski, P., Pirrone, S., Politi, G., Porto, F., Reviol, W., Riccio, F., Rizzo, F., Rosato, E., Rossi, D., Santoro, S., Sarantites, D. G., Simon, H., Skwirczynska, I., Sosin, Z., Stuhl, L., Trautmann, W., Trifirò, A., Trimarchi, M., Tsang, M. B., Verde, G., Veselsky, M., Vigilante, M., Wang, Yongjia, Wieloch, A., Wigg, P., Winkelbauer, J., Wolter, H. H., Wu, P., Yennello, S., Zambon, P., Zetta, L., and Zoric, M.

Subjects
energy: symmetry, QC1-999, Hadron, Nuclear Theory, Elementary particle, Astrophysics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, Physics and Astronomy (all), 0103 physical sciences, Neutron, ddc:530, 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, Elliptic flow, gold, charged particle, Charged particle, Symmetry (physics), Darmstadt Lab, n: elliptic flow, nucleus: equation of state, density dependence, density, Baryon, Nucleon, light nucleus, saturation: density, experimental results
Abstract

International audience; The ASY-EOS experiment at GSI laboratory measured the direct and elliptic flow of neutrons and light charged particles in the reaction 197Au+197 Au at 400 A MeV incident energy. The ratio of elliptic flow of neutrons with respect to that of the light charged particles was used as main experimental observable to probe the density dependence of the symmetry energy term of the nuclear equation of state. Results, obtained by comparison of the experimental data with the UrQMD model predictions, strongly support a moderately soft to linear density dependence of the symmetry energy at suprasaturation densities below 2ρ0.

Published
2016

47. First Measurement of Severalβ-Delayed Neutron Emitting Isotopes BeyondN=126

Author

Michael Heil, H. Schaffner, C. Domingo-Pardo, C. Paradela, Thomas Davinson, M. Marta, Gabriel Martínez-Pinedo, Fernando Montes, M. Bowry, D. Galaviz, E. Wilson, A. Prochazka, R. Caballero-Folch, Iris Dillmann, Karl Smith, I. Kojouharov, C. Scheidenberger, G. Cortes, A. R. García, C. Nociforo, Roman Gernhäuser, A. V. Yeremin, A. Estrade, C. Hinke, Yu. A. Litvinov, Ivan Borzov, B. Rubio, Tomislav Marketin, E. Sokol, Yassid Ayyad, M. Takechi, J. S. Winfield, A. Arcones, Stephen Rice, F. Farinon, J. L. Tain, F. Ameil, Philip Woods, D. Cano-Ott, S. Pietri, Helmut Weick, M. B. Gómez-Hornillos, A. Evdokimov, R. Knöbel, L. Maier, A. Riego, W. Gelletly, I. Mukha, J. Agramunt, Alejandro Algora, K. Steiger, Hans Geissel, Zs. Podolyák, Thomas Faestermann, J. Kurcewicz, N. Kurz, Bao-Hua Sun, R. Wood, Carlos Guerrero, F. Calviño, T. Martinez, J. Marganiec, D. Testov, D. R. Napoli, and J. Benlliure

Subjects
Physics, Isotope, 010308 nuclear & particles physics, Neutron emission, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, General Physics and Astronomy, 01 natural sciences, Mass formula, Nuclear physics, 13. Climate action, Nucleosynthesis, 0103 physical sciences, r-process, Neutron, Nuclear Experiment, 010306 general physics, s-process, Delayed neutron
Abstract

The β-delayed neutron emission probabilities of neutron rich Hg and Tl nuclei have been measured together with β-decay half-lives for 20 isotopes of Au, Hg, Tl, Pb, and Bi in the mass region N≳126. These are the heaviest species where neutron emission has been observed so far. These measurements provide key information to evaluate the performance of nuclear microscopic and phenomenological models in reproducing the high-energy part of the β-decay strength distribution. This provides important constraints on global theoretical models currently used in r-process nucleosynthesis.

Published
2016

48. Coulomb dissociation of $^{20,21}$N

Author

A. Estrade, G. Burgunder, Andreas Martin Heinz, Andreas Wagner, Enrique Casarejos, Roy Crawford Lemmon, C. Wimmer, Ethan Uberseder, M. Heine, T. Le Bleis, N. Kurz, H. O. U. Fynbo, Olof Tengblad, D. Cortina-Gil, V. Stoica, F. Farinon, L. Atar, D. Yakorev, Joachim Enders, Helmut Weick, Z. Elekes, Carlos A. Bertulani, J. Sanchez del Rio Saez, Håkan T Johansson, Daniel Bemmerer, M. Freudenberger, D. Galaviz, Mikhail V. Zhukov, Heiko Scheit, Herbert A. Simon, A. Ignatov, P. Diaz-Fernandez, Nasser Kalantar-Nayestanaki, C. Wheldon, Thomas Aumann, P. Velho, J. Van de Walle, K. Riisager, Pavel Golubev, U. Datta Pramanik, J. Taylor, J. Marganiec, G. L. Wilson, Ralf Plag, J. Benlliure, O. Lepyoshkina, Marielle Chartier, N. I. Ashwood, A. Movsesyan, M. Röder, Andreas Zilges, Yasuhiro Togano, P. J. Woods, Ronja Thies, S. Pietri, R. Kanungo, Kai Zuber, Najafi, M. Labiche, M. J. G. Borge, Thomas Nilsson, A. Prochazka, G. Ribeiro, Christoph Langer, Ángel Perea, Roman Gernhäuser, G. Ickert, T. Adachi, R. Crespo, K. Boretzky, J. S. Winfield, W. N. Catford, G. Rastrepina, H. Alvarez-Pol, Bo Jakobsson, M. Barr, L. M. Fraile, C. Nociforo, F. Wamers, Rahaman, M. V. Ricciardi, M. Mostazo Caro, Björn Jonson, T. Kröll, Y. Aksyutina, Vladimir Avdeichikov, R. Knöbel, Matthias Heil, C. Caesar, B. Streicher, Joakim Cederkäll, J. Hagdahl, J. Kurcewicz, Deniz Savran, M. Caamaño, V. Volkov, Satoru Terashima, M. Holl, O. Ershova, Kathrin Göbel, A. Henriques, Martin Freer, J. Alcantara, Jorge Machado, Marina Petri, D. M. Rossi, Tanja Heftrich, S. Chakraborty, Mario Weigand, Simon Lindberg, R. Krücken, D. Gonzalez Diaz, Catherine Rigollet, Hans Geissel, Rene Reifarth, O. Sorlin, L. V. Chulkov, I. Dillmann, Stefanos Paschalis, V. Panin, S. Altstadt, S. Beceiro, A. Kelic-Heil, Helmholtz zentrum für Schwerionenforschung GmbH (GSI), 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), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Light nucleus, 010308 nuclear & particles physics, Thermonuclear reaction, Aucun, FOS: Physical sciences, chemistry.chemical_element, Detailed balance, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Dissociation (chemistry), Ion, chemistry, 0103 physical sciences, Coulomb, Fluorine, Nuclear Experiment (nucl-ex), Atomic physics, 010306 general physics, Nuclear Experiment, Excitation
Abstract

International audience; Neutron-rich light nuclei and their reactions play an important role for the creation of chemical elements. Here, data from a Coulomb dissociation experiment on $^{20,21}$N are reported. Relativistic $^{20,21}$N ions impinged on a lead target and the Coulomb dissociation cross section was determined in a kinematically complete experiment. Using the detailed balance theorem, the $^{19}\mathrm{N}(\mathrm{n},\gamma)^{20}\mathrm{N}$ and $^{20}\mathrm{N}(\mathrm{n},\gamma)^{21}\mathrm{N}$ excitation functions and thermonuclear reaction rates have been determined. The $^{19}\mathrm{N}(\mathrm{n},\gamma)^{20}\mathrm{N}$ rate is up to a factor of 5 higher at $T

Published
2016

49. Experimental program of the Super-FRS Collaboration at FAIR and developments of related instrumentation

Author

T. Grahn, Hooi Jin Ong, S. Purushothaman, K. Itahashi, A. S. Fomichev, Peter Egelhof, Juha Äystö, Isao Tanihata, Ari Jokinen, A. Bracco, J. Benlliure, M. Pfützner, A. Prochazka, M.N. Harakeh, I. G. Mukha, T. Saito, S. Pietri, Wolfgang R. Plaß, C. Nociforo, V. Zamfir, K.-H. Behr, M. Winkler, Livius Trache, Satoru Terashima, Herbert A. Simon, L. V. Grigorenko, Nasser Kalantar-Nayestanaki, Hiroshi Toki, Sydney Gales, Helmut Weick, Christoph Scheidenberger, S. Heinz, G. Münzenberg, Horst Lenske, Ryugo S. Hayano, R. Kanungo, H. Geissel, J. S. Winfield, and Helsinki Institute of Physics

Subjects
Nuclear and High Energy Physics, Meson, Neutron emission, COHERENT EXCITATION, Projectile fragments, 01 natural sciences, 114 Physical sciences, law.invention, Nuclear physics, ENERGY, law, 0103 physical sciences, SCATTERING, SPECTROMETER, FACILITY, 010306 general physics, Spectroscopy, Nuclear Experiment, Instrumentation, Physics, ta114, Isotope, Spectrometer, NUCLEI, 010308 nuclear & particles physics, Scattering, Detector, Magnetic spectrometer, PERFORMANCE, INVERSE KINEMATICS, PRODUCTS, STATES, Achromatic lens, Experiments
Abstract

The physics program at the super-conducting fragment separator (Super-FRS) at FAIR, being operated in a multiple-stage, high-resolution spectrometer mode, is discussed. The Super-FRS will produce, separate and transport radioactive beams at high energies up to 1.5 AGeV, and it can be also used as a stand-alone experimental device together with ancillary detectors. Various combinations of the magnetic sections of the Super-FRS can be operated in dispersive, achromatic or dispersion-matched spectrometer ion-optical modes, which allow measurements of momentum distributions of secondary-reaction products with high resolution and precision. A number of unique experiments in atomic, nuclear and hadron physics are suggested with the Super-FRS as a stand-alone device, in particular searches for new isotopes, studies of hyper-nuclei, delta-resonances in exotic nuclei and spectroscopy of atoms characterized by bound mesons. Rare decay modes like multiple-proton or neutron emission and the nuclear tensor force observed in high momentum regime can be also addressed. The in-flight radioactivity measurements as well as fusion, transfer and deep-inelastic reaction mechanisms with the slowed-down and energy-bunched fragment beams are proposed for the high-resolution and energy buncher modes at the Super-FRS. (C) 2016 Elsevier B.V. All rights reserved.

Published
2016

50. Fission dynamics at high excitation energies investigated in complete kinematics measurements

Author

J. Benlliure, Yassid Ayyad, Enrique Casarejos, E. Pellereau, H. Alvarez-Pol, J. F. Martin, B. Pietras, A. Chatillon, G. Belier, C. Paradela, G. Boutoux, B. Laurent, L. Audouin, Andreas Martin Heinz, J. Vargas, D. Cortina-Gil, T. Gorbinet, A. Kelic-Heil, C. Rodriguez-Tajes, J. L. Rodriguez-Sanchez, J. Taieb, Herbert A. Simon, D. Ramos, Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université 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 Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, History, Inverse kinematics, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Fission, Nuclear Theory, Observable, Kinematics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Kinetic energy, 7. Clean energy, 01 natural sciences, Coincidence, Computer Science Applications, Education, Nuclear physics, 0103 physical sciences, Dissipative system, Atomic physics, 010306 general physics, Nuclear Experiment, Excitation
Abstract

International audience; Light-charged particles emitted in proton-induced fission reactions on (208)Pb have been measured at different kinetic energies: 370A, 500A, and 650A MeV. The experiment was performed by the SOFIA collaboration at the GSI facilities in Darmstadt (Germany). The inverse kinematics technique was combined with a setup especially designed to measure light-charged particles in coincidence with fission fragments. The data were compared with different model calculations to assess the ground-to-saddle dynamics. The results confirm that transient and dissipative effects are required for an accurate description of the fission observables.

Published
2016

Catalog

Books, media, physical & digital resources
See catalog results