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Your search keyword '"J.J. Valiente Dobon"' showing total 4 results
Start Over Author "J.J. Valiente Dobon" Topic nuclear physics
4 results on '"J.J. Valiente Dobon"'

1. Lifetime measurments of excited states in neutron-rich fission fragments

Author

T.W. Hagen, L. Grente, A. Görgen, M.-D. Salsac, W. Korten, F. Farget, T. Braunroth, B. Bruyneel, I. Celikovic, E. Clément, G. de France, O. Delaune, A. Dewald, A. Dijon, M. Hackstein, B. Jacquot, J. Litzinger, J. Ljungvall, C. Louchart, C. Michelagnoli, D.R. Napoli, A. Navin, F. Recchia, M. Rejmund, W. Rother, E. Sahin, S. Siem, B. Sulignano, Ch. Theisen, J.J. Valiente-Dobon, 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), 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), CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM)

Subjects
Physics, Spectrometer, 010308 nuclear & particles physics, Fission, Gamma ray, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, symbols.namesake, Physics and Astronomy (all), Recoil, Excited state, 0103 physical sciences, symbols, Neutron, Atomic number, Atomic physics, Nuclear Experiment, Doppler effect
Abstract

Expérience GANIL/VAMOS/EXOGAM; International audience; Lifetimes of short-lived excited states in a wide range of neutron-richfission fragments were measured using the recoil distance Doppler shift(RDDS) technique, which was applied to fusion-fission reactions in inversekinematics for the first time. The fission fragments were identified eventby-event in mass, charge, and atomic number using the VAMOS magneticspectrometer at GANIL. Gamma rays originating from the fission fragmentswere measured with the EXOGAM array of Ge Clover detectors aroundthe target position. Using a degrader, the change in the Doppler shiftof the $\gamma$ ray allows the application of the RDDS method. Details of theexperimental technique will be discussed and the status for the ongoinganalysis for odd-mass yttrium isotopes will be presented.

Published
2015
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2. Kaon Tagging at 0° Scattering Angle for High-Resolution Decay-Pion Spectroscopy

Author

Patrick Achenbach, Joerg Reinhold, Osamu Hashimoto, Salvador Sánchez Majos, Liguang Tang, B. S. Schlimme, O. Borodina, Concettina Sfienti, V. Bozkurt, Sho Nagao, R. Böhm, T. R. Saito, Simon Širca, Alicia Sanchez Lorente, F. Schulz, Junichiro Kusaka, Naoki Arai, U. Müller, Josef Pochodzalla, Kazushige Maeda, Kyo Tsukada, Carlos Ayerbe Gayoso, L. Debenjak, Anselm Esser, Y. Fujii, Amur Margaryan, Toshiyuki Gogami, E. Kim, Mar Gómez Rodríguez, Masashi Kaneta, Damir Bosnar, C. Rappold, M. Schoth, Hiroki Kanda, Satoshi Nakamura, M. O. Distler, Michaela Thiel, Harald Merkel, S. Hirose, Ivica Friščić, and S. Lunardi, P.G. Bizzeti, Sonia Kabana, C. Bucci, M. Chiari, A. Dainese, P. Di Nezza, R. Menegazzo, A. Nannini, C. Signorini and J.J. Valiente‐Dobon

Subjects
Physics, Particle physics, Spectrometer, Scattering, QC1-999, Nuclear Theory, Bremsstrahlung, Strangeness production, Nuclear physics, Momentum, Pion, Pair production, Electron Scattering, Hypernuclei, MAMI, KAOS, Decay-Pion Spectroscopy, High Energy Physics::Experiment, Nuclear Experiment, Microtron
Abstract

At the Mainz Microtron hypernuclei can be studied by (e,e'K) reactions. By detecting the kaon which is emitted in forward direction, with the KAOS spectrometer placed at 0 scattering angle, reactions involving open strangeness production are tagged. High-resolution magnetic spectrometers are then used to coincidentally detect the mono- energetic decay-pions from mesonic two-body weak decays of light hypernuclei at rest. As a pioneering experiment has confirmed, the KAOS spectrometer is exposed to a large flux of background particles, mostly positrons from bremsstrahlung pair production. In order to increase the e ciency of kaon identification the KAOS spectrometer was modi- fied to suppress background particles at the cost of a high momentum resolution, which is less important for this experiment. This was achieved by placing up to 14 cm of lead absorbers in front of the detectors, in which positrons are blocked by forming electro- magnetic showers while the e ect on kaons is limited. An additional time-of-flight wall and a new threshold ˘ Cerenkov detector help to increase the detection e ciency of kaons.

Published
2014

3. Isospin transport in 84Kr+112,124Sn reactions at Fermi energies

Author

M. Cinausero, M.F. Rivet, N. Le Neindre, R. Bougault, T. Marchi, R. Alba, Sandro Barlini, Gabriele Pasquali, T. Twaróg, D. Gruyer, G. Spadaccini, O. Lopez, Elio Rosato, B. Borderie, Giovanni Casini, E. Bonnet, J.D. Frankland, Tomasz Kozik, Maurizio Bini, Silvia Piantelli, Alessandro Olmi, Luca Morelli, M. Parlog, A. Chbihi, Giacomo Poggi, E. Vient, C. Maiolino, Andrea Stefanini, F. Gramegna, M. Bruno, S. Carboni, P. R. Maurenzig, M. Degerlier, Mariano Vigilante, Domenico Santonocito, 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), 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), FAZIA, Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-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)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), S. Lunardi, P.G. Bizzeti, C. Bucci, M. Chiari, A. Dainese, P. Di Nezza, R. Menegazzo, A. Nannini, C. Signorini, J.J. Valiente-Dobon, S., Piantelli, G., Casini, A., Olmi, S., Barlini, M., Bini, S., Carboni, P. R., Maurenzig, G., Pasquali, G., Poggi, A. A., Stefanini, R., Bougault, N., Le Neindre, O., Lopez, M., Pârlog, E., Vient, E., Bonnet, A., Chbihi, J. D., Frankland, D., Gruyer, Rosato, Elio, Spadaccini, Giulio, Vigilante, Mariano, B., Borderie, M. F., Rivet, M., Bruno, L., Morelli, M., Cinausero, M., Degerlier, F., Gramegna, T., Marchi, R., Alba, C., Maiolino, D. Santonocito T., Kozik, and T., Twaróg

Subjects
Nuclear reaction, Physics, Density gradient, QC1-999, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nuclear reaction, Ion, isotopic identification, Diffusion process, Isospin, Nuclear reactions, Nuclear Experiment (nucl-ex), Atomic physics, Nuclear Experiment, Transport phenomena, Beam (structure), Nuclear Physics, Fermi Gamma-ray Space Telescope
Abstract

Isospin transport phenomena in dissipative heavy ion collisions have been investigated at Fermi energies with a beam of 84Kr at 35AMeV. A comparison of the /Z of light and medium products forward-emitted in the centre of mass frame when the beam impinges on a n-poor 112Sn and a n-rich 124Sn targets is presented. Data were collected by means of a three-layer telescope with very good performances in terms of mass identification (full isotopic resolution up to Z about 20 for ions punching through the first detector layer) built by the FAZIA Collaboration and located just beyond the grazing angle for both reactions. The /Z of the decay products emitted when the n-rich target is used is always higher than that associated to the n-poor one. Since the detector was able to measure only fragments coming from the QuasiProjectile decay and/or neck emission, the observed behaviour can be ascribed to the isospin diffusion, driven by the isospin gradient between QuasiProjectile and QuasiTarget. Moreover, for light fragments the /Z as a function of the lab velocity of the fragment increases when we move from the QuasiProjectile velocity to the centre of mass (neck zone). This effect can be interpreted as an evidence of isospin drift driven by the density gradient between the QuasiProjectile zone (at normal density) and the more diluted neck zone., Comment: 4 pages, 3 figures, Contribution to conference proceedings of the 25th International Nuclear Physics Conference (INPC 2013) Journal-ref: 25th International Nuclear Physics Conference (INPC 2013), Firenze : Italy (2013)

Published
2013
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4. Decay competition for IMF produced in the collisions 78Kr+40Ca and 86Kr+48Ca at 10 A*MeV

Author

G. Cardella, Maria Colonna, D. Loria, Giuseppe Verde, S. Pirrone, F. Porto, M. La Commara, W. U. Schroeder, G. Ademard, Jan Toke, Elio Rosato, E. Geraci, J.P. Wieleczko, E. La Guidara, I. Berceanu, C. Beck, G. Spadaccini, E. De Filippo, E. Henry, F. Amorini, Eric Bonnet, A. Chbihi, Michele Papa, A. Pagano, Mariano Vigilante, M.F. Rivet, M. Quinlann, Antonio Trifiro, G. Lanzalone, Ivano Lombardo, P. Lautesse, M. Trimarchi, K. Mazurek, N. Le Neindre, Lucrezia Auditore, J.D. Frankland, D. Lebhertz, G. Politi, P. Russotto, F. Rizzo, E. Piasecki, B. Borderie, 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), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), S. Lunardi, P.G. Bizzeti, C. Bucci, M. Chiari, A. Dainese, P. Di Nezza, R. Menegazzo, A. Nannini, C. Signorini, J.J. Valiente-Dobon, LA COMMARA, Marco, S., Pirrone, G., Politi, J. P., Wieleczko, G., Ademard, E., De Filippo, Vigilante, Mariano, F., Amorini, L., Auditore, C., Beck, I., Berceanu, E., Bonnet, B., Borderie, G., Cardella, A., Chbihi, M., Colonna, J. D., Frankland, E., Geraci, E., Henry, E., La Guidara, G., Lanzalone, P., Lautesse, D., Lebhertz, N., Le Neindre, Lombardo, Ivano, D., Loria, K., Mazurek, A., Pagano, M., Papa, E., Piasecki, F., Porto, M., Quinlann, F., Rizzo, Rosato, Elio, P., Russotto, W. U., Schroeder, Spadaccini, Giulio, A., Trifirò, J., Tõke, M., Trimarchi, G., Verde, 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
Nuclear reaction, Physics, Fusion, 010308 nuclear & particles physics, QC1-999, compound nucleu, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, Excited state, Isospin, 0103 physical sciences, fragments, Nuclear reactions, Atomic physics, 010306 general physics
Abstract

Expérience GANIL; International audience; Decay modes of excited compound systems 118Ba and 134Ba, produced respectively in the 78Kr+40Ca and 86Kr+48Ca collisions at 10 A*MeV, are investigated. In particular, the competition between the various disintegration path of medium mass compound nuclei, formed by fusion processes, the production of the so referred Intermediate Mass Fragments (IMF), and the isospin dependence of the decay process are studied. Data were taken at the INFN-Laboratori Nazionali del Sud (LNS) by using the CHIMERA array. Data analysis is in progress; a first indication on the average-energy angular distributions suggests pre-equilibrium effects affecting the data and the presence of isotopical effects.

Published
2013
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