Author: "O. Yordanov" - Searchworks@Jio Institute Digital Library Search Results

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63 results on '"O. Yordanov"'

1. Structure of the low-lying states in Pd99,101,103,105

Author: D. Ivanova, S. Lalkovski, C. Costache, S. Kisyov, C. Mihai, N. Mǎrginean, P. Petkov, L. Atanasova, D. Bucurescu, R. B. Cakirli, M. P. Carpenter, R. F. Casten, Gh. Cǎta-Danil, I. Cǎta-Danil, D. Deleanu, D. Filipescu, N. Florea, I. Gheorghe, D. Ghiţǎ, T. Glodariu, F. G. Kondev, R. Lica, R. Mǎrginean, A. Negret, S. Pascu, T. Sava, E. A. Stefanova, L. Stroe, G. Suliman, R. Suvaila, O. Yordanov, and N. V. Zamfir
Published: 2022

2. Fast-timing measurements in the ground-state band of Pd114

Author: T. Lauritsen, T. Kröll, L. A. Gurgi, F. G. Kondev, G. J. Lane, I. Burrows, D. M. Cullen, O. Yordanov, S. Lalkovski, Alison Bruce, John P. Greene, T. Daniel, V. F. E. Pucknell, D. Seweryniak, D. J. Hartley, Gavin Lotay, C. M. Shand, M. Smolen, T. Berry, S. Bottoni, C. R. Niţă, E. A. Stefanova, J. Sethi, E.R. Gamba, R. Ilieva, M. Carmona Gallardo, S. Zhu, J. Rohrer, J. T. Anderson, A. D. Ayangeakaa, S. Ilieva, J. Simpson, Matthew Reed, M. P. Carpenter, P. Copp, M. Rudigier, V. Vedia, I.H. Lazarus, P. H. Regan, Raymond J. Carroll, Zs. Podolyák, and G. Fernández Martínez
Subjects: Physics, Work (thermodynamics), Isotope, Yrast, chemistry.chemical_element, medicine.anatomical_structure, chemistry, medicine, Gammasphere, Interacting boson model, Atomic physics, Ground state, Nucleus, Palladium
Abstract: Using a hybrid Gammasphere array coupled to 25 LaBr3(Ce) detectors, the lifetimes of the first three levels of the yrast band in ¹¹⁴Pd populated via ²⁵²Cf decay, have been measured. The measured lifetimes are τ₂+=103(10)ps, τ₄+=22(13)ps, and τ₆+≤10ps for the 2⁺₁, 4⁺₁, and 6⁺₁ levels, respectively. Palladium-114 was predicted to be the most deformed isotope of its isotopic chain, and spectroscopic studies have suggested it might also be a candidate nucleus for low-spin stable triaxiality. From the lifetimes measured in this work, reduced transition probabilities B(E2;J→J−2) are calculated and compared with interacting boson model, projected shell model, and collective model calculations from the literature. The experimental ratio RB(E₂)=B(E2;4⁺₁→2⁺₁)/B(E2;2⁺₁→0⁺₁)=0.80(42) is measured for the first time in ¹¹⁴Pd and compared with the known values RB(E₂) in the palladium isotopic chain: the systematics suggest that, for N=68, a transition from γ-unstable to a more rigid γ-deformed nuclear shape occurs.
Published: 2019

3. Study of the reaction mechanisms of $^{136}$Xe + p and $^{136}$Xe + $^{12}$C at 1 A GeV with inverse kinematics and large-acceptance detectors

Author: B. Czech, Sylvie Leray, C. Caesar, Haik Simon, Enrique Casarejos, J.E. Ducret, Josef Klimo, S. Pietri, Alain Boudard, Sébastien Bianchin, Martin Veselsky, Christopher Rappold, S. Hlavac, O. Yordanov, Marie-Delphine Salsac, Olga Borodina, Davide Mancusi, T. Gorbinet, Tudy Le Bleis, C. Langer, N. Kurz, Thomas Aumann, J. Lukasik, Piotr Pawłowski, Yassid Ayyad, 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 d'Etudes Lasers Intenses et Applications (CELIA), Université de Bordeaux (UB)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-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), Service d’Études des Réacteurs et de Mathématiques Appliquées (SERMA), Département de Modélisation des Systèmes et Structures (DM2S), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Service des Réacteurs et de Mathématiques Appliquées (SERMA), CEA-Direction de l'Energie Nucléaire (CEA-DEN), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-CEA-Direction de l'Energie Nucléaire (CEA-DEN), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Bordeaux (UB), 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 reaction, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Hadron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Charged particle, Nuclear physics, Excited state, 0103 physical sciences, Nuclear fusion, Neutron, 010306 general physics, Nucleon, Nuclear Experiment, Excitation
Abstract: International audience; The reactions$^{136}$Xe + p and$^{136}$Xe +$^{12}$C have been studied in inverse kinematics at 1 A GeV with the SPALADiN setup at GSI. The detection in coincidence of the final-state charged particles (projectile residues, nuclei of charge $ Z \geq 2$ and neutrons was performed with a big-aperture dipole magnet and large-acceptance detectors. This provided an extended coverage of the phase space of decay products of the prefragment formed at the end of the intranuclear cascade. This coincidence measurement, performed on an event-by-event basis permits both an estimate of the excitation energy of the prefragments and a determination of their deexcitation channels. The element production cross sections are compared with existing data and theoretical models. The evolution of observables such as the total multiplicity or the fragment production with the prefragment’s excitation energy is studied for both reactions and compared with models.
Published: 2019

4. Structure of the neutron mid-shell nuclei Ag64,66111,113

Author: S. Lalkovski, T. Kutsarova, A. Lopez-Martens, E. A. Stefanova, S. Kisyov, A. Jansen, B. Herskind, H. Hübel, A. Korichi, O. Yordanov, T. L. Khoo, Zs. Podolyák, Andreas Görgen, D. Bazzacco, G. Schönwasser, A. Minkova, and M. Bergström
Subjects: Condensed Matter::Quantum Gases, Physics, 010308 nuclear & particles physics, Yrast, Nuclear Theory, Shell (structure), Structure (category theory), 01 natural sciences, Nuclear fission, 0103 physical sciences, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract: $^{111}\mathrm{Ag}$ and $^{113}\mathrm{Ag}$ were produced in induced fission reaction, where yrast and near-yrast states were populated. To interpret the new data the Interacting Boson-Fermion Model was used. A good agreement with the experimental data is achieved, suggesting that the two Ag nuclei have a well-developed collectivity, superimposed on $\ensuremath{\pi}{g}_{9/2}^{\ensuremath{-}3}$ excitations previously observed throughout the entire isotopic chain.
Published: 2017

5. 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

6. Fast timing measurement using an labr3(Ce) scintillator detector array coupled with gammasphere

Author: Alec Grant, T. Kröll, V. F. E. Pucknell, I. Burrows, J. T. Anderson, G. Fernández Martínez, S. Bottoni, T. Daniel, F. G. Kondev, R. Ilieva, S. Zhu, V. Vedia, A. D. Ayangeakaa, E. A. Stefanova, T. Lauritsen, D. Seweryniak, Gavin Lotay, M. Rudigier, John P. Greene, I.H. Lazarus, S. Lalkovski, E.R. Gamba, P. H. Regan, R. V. F. Janssens, M. Smolen, C. M. Shand, D. J. Hartley, J. Sethi, M. P. Carpenter, Gregory Lane, D. M. Cullen, L.A. Guegi, T. Berry, P. Copp, J. Rohrer, Raymond J. Carroll, O. Yordanov, M. Carmona Gallardo, Jayne Simpson, Alison Bruce, Zs. Podolyák, Matthew Reed, S. Ilieva, and L. M. Fraile
Subjects: Physics, Fission products, 010308 nuclear & particles physics, Fission, General Physics and Astronomy, Radiation, Nanosecond, Scintillator, 01 natural sciences, Nuclear physics, Data acquisition, Picosecond, 0103 physical sciences, Gammasphere, Física nuclear, 010306 general physics
Abstract: A fast-timing experiment was performed at the Argonne National Laboratory in December 2015 and January 2016, measuring decay radiation of fission products from a Cf-252 fission source. Details of the set-up, integration with Digital Gammasphere, and the data acquisition system are presented. The timing performance of the set-up, capable of measuring lifetimes from the nanosecond region down to tens of picoseconds, is discussed. First preliminary results from the fast-timing analysis of the fission fragment data are presented.
Published: 2017
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7. 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

8. Isotopic yields of spallation residues produced inXe136-induced reactions on deuterium at500AMeV

Author: C. Volant, J. L. Rodriguez-Sanchez, C. Paradela, L. Audouin, Andreas Martin Heinz, O. Yordanov, Enrique Casarejos, L. Tassan-Got, D. Henzlova, P. Napolitani, C. Schmitt, C. Stephan, A. Lafriaskh, T. Enqvist, F. Farget, V. Henzl, Juan Antonio Alcantara-Nunez, S. Leray, C. Villagrasa, J. Pereira, A. Boudard, M. V. Ricciardi, J. Benlliure, A. Kelic-Heil, K.-H. Schmidt, C. Pérez-Loureiro, and M. Fernandez-Ordoñez
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Deuterium, Spectrometer, Projectile, Nuclear Theory, Monte Carlo method, Spallation, Nuclear Experiment
Abstract: Residual fragment production in reactions induced by $^{136}\mathrm{Xe}$ projectiles impinging on a liquid deuterium target at $500A$ MeV has been measured at GSI. Projectile residues were unambiguously identified in atomic and mass numbers using the Fragment Separator as high-resolution zero-degree spectrometer. The isotopic production yields of these residuals were used to benchmark reference model calculations describing spallation reactions. In particular the energy dissipated in these reactions was assessed by comparing the production yields measured in this work with the ones obtained in reactions induced by $^{136}\mathrm{Xe}$ projectiles on protons at $1000A$ and $500A$ MeV.
Published: 2015

9. Exclusive measurements on at 1AGev with the SPALADIN setup at GSI

Author: S. Pietri, A. Lafriakh, A. Le Fèvre, Thomas Aumann, S. Leray, M. Fernandez-Ordoñez, F. Rejmund, Michel Combet, W. F. J. Müller, W. Trautmann, C. Schwarz, Enrique Casarejos, E. Le Gentil, C.O. Bacri, Herbert A. Simon, J. Lukasik, J.E. Ducret, C. Sfienti, A. Boudard, O. Yordanov, K. Kezzar, R. Krücken, J. Benlliure, A. Kelic, C. Volant, Håkan T Johansson, T. Kurtukian-Nieto, M. Böhmer, and Roman Gernhäuser
Subjects: Physics, Nuclear and High Energy Physics, Photon, Time projection chamber, Ion beam, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, chemistry.chemical_element, 01 natural sciences, 7. Clean energy, Nuclear physics, chemistry, Hodoscope, Dipole magnet, 0103 physical sciences, Physics::Accelerator Physics, Neutron detection, Spallation, Atomic physics, Nuclear Experiment, 010306 general physics, Instrumentation, Helium
Abstract: A new type of spallation experiments has been carried out at GSI, Darmstadt (Germany) in order to understand the spallation mechanism in greater details. These experiments use the inverse-kinematics technique where the ion beam is directed onto a liquid Hydrogen target, allowing the detection of heavy spallation residues in coincidence with low center-of-mass energy light particles. The setup is based on A Large Acceptance DIpole magNet (ALADIN) coupled with a multitrack Time Projection Chamber (TPC), a hodoscope and a neutron detector. First, data on 56 Fe + p at 1 A GeV were taken in February 2004. In the on-going analysis, isotopic cross-sections have been determined and compared to data taken at the FRagment Separator in GSI. Mean values and width of residue velocity distributions have also been obtained as well as Helium production cross-section. First, coincidence data are being analyzed.
Published: 2006

10. Neutron yields from 1GeV/nucleon 238U ion beams on Fe target

Author: Dieter Schardt, Torsten Radon, K. Gunzert-Marx, K. Boretzky, Håkan T Johansson, A. Kovalov, O. Yordanov, F. Gutermuth, Thomas Aumann, K. L. Jones, H. Emling, G. Fehrenbacher, Hiroshi Iwase, and P. Adrich
Subjects: Physics, Nuclear and High Energy Physics, Ion beam, business.industry, Nuclear Theory, Kinetic energy, Neutron spectroscopy, Ion, Nuclear physics, Physics::Accelerator Physics, Neutron, Radiation protection, Nuclear Experiment, Nucleon, business, Instrumentation, Beam (structure)
Abstract: Yields of neutrons produced by a 238U ion beam of 1 GeV/nucleon kinetic energy impinging on a thick Fe target were measured resulting in distributions differential in neutron angle (0° 50 MeV). The data serve in radiation protection planning for next-generation rare-isotope beam facilities. The experimental data are contrasted with predictions from transport codes as currently used in radiation shield design studies.
Published: 2005

11. Complex nuclear-structure phenomena in the cooling down of highly excited nuclear systems

Author: M. V. Ricciardi, A.V. Ignatyuk, P. Napolitani, O. Yordanov, F. Rejmund, K.-H. Schmidt, A. Kelic, 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), D. Amadova, A. Krugler, and P. Tlusty
Subjects: NUCLEAR REACTIONS, Nuclear reaction, Physics, 25.75.-q, 29.30.Aj, 21.10.-k, Nuclear and High Energy Physics, NUCLEAR STRUCTURE, Nuclear Theory, Nuclear structure, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear matter, 238U, Superfluidity, nuclide identification by high-resolution magnetic spectrometer, complex even-odd structure in nuclide production, Nuclear fission, Excited state, Phase (matter), production yields of light residues, Ti, Atomic physics, Nuclear Experiment, Excitation, Ebeam=1A GeV
Abstract: Complex structural effects in the nuclide production from the projectile fragmentation of 1 A GeV 238 U nuclei in a titanium target, manifested as an even-odd effect, are reported. The structure seems to be insensitive to the excitation energy induced in the reaction. This is in contrast to the prominent structural features found in nuclear fission and in transfer reactions, which gradually disappear with increasing excitation energy. Most of the features of the results are reproduced using the statistical model of nuclear reactions, treating the pairing correlations in a consistent way both in the masses and in the level densities. The structures appear as the result of the condensation process of heated nuclear matter while cooling down in the evaporation process. As such, it can be considered a manifestation of the passage from the normal liquid phase of the nucleus to its superfluid phase.
Published: 2005

12. Beta-decay half-lives of new neutron-rich isotopes of Re, Os and Ir approaching the r-process path near N = 126

Author: F. Becker, Enrique Casarejos, B. Jurado, F. Farget, O. Yordanov, Karlheinz Langanke, K.-H. Schmidt, B. Blank, Daniela Henzlova, L. Audouin, J. Benlliure, J. Giovinazzo, Gabriel Martínez-Pinedo, M. Fernandez-Ordoñez, Ivan Borzov, J. Pereira, T. Kurtukian-Nieto, 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), Noyaux exotiques (NEX), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), Aval du cycle et Energie Nucléaire (ACEN), 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), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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, Nuclear and High Energy Physics, Isotope, Hadron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Beta decay, Nuclear physics, Fragmentation (mass spectrometry), r-process, Nuclear fusion, Neutron, Nuclide, Atomic physics
Abstract: Expérience à GSI/FRS; Heavy neutron-rich nuclei close to N = 126 were produced by fragmentation of a 1A GeV 208Pb beam at the FRS at GSI. The β-decay half-lives of 7 nuclides have been determined using a novel numerical analysis method. The half-lives of 202,199Ir, 200,199Os and 196Re are reported for the first time. The comparison of the data with model calculations provides indications on the importance of first-forbidden transitions on the β-decay of nuclei around N = 126 and Z < 82.
Published: 2014

13. Production cross sections of heavy neutron-rich nuclei approaching the nucleosynthesis r-process path around A = 195

Author: F. Becker, J. Pereira, M. Fernandez-Ordoñez, K.-H. Schmidt, B. Blank, T. Kurtukian-Nieto, Enrique Casarejos, Daniela Henzlova, J. Giovinazzo, L. Audouin, F. Farget, O. Yordanov, J. Benlliure, B. Jurado, 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), Noyaux exotiques (NEX), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), Aval du cycle et Energie Nucléaire (ACEN), 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), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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, Nuclear physics, Nuclear and High Energy Physics, 26.30.Hj, 25.70.Mn, 27.80.+w, Nucleosynthesis, Path (graph theory), r-process, Neutron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published: 2014

14. Coexisting structures in Ru-105

Author: M. Bergström, A. Lopez-Martens, S. Kisyov, J. Kownacki, D. Ivanova, D. Bazzacco, A. Jansen, F. G. Kondev, S. Lalkovski, B. Herskind, P. Petkov, A. Korichi, G. Schönwasser, T. L. Khoo, Andreas Görgen, Zs. Podolyák, T. Kutsarova, E. A. Stefanova, O. Yordanov, A. Minkova, H. Hübel, CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM)
Subjects: Physics, EXCITATIONS, Nuclear and High Energy Physics, 010308 nuclear & particles physics, HIGH-SPIN, Astrophysics::High Energy Astrophysical Phenomena, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, medicine.anatomical_structure, NUCLEAR-DATA SHEETS, STATES, Nuclear fission, Excited state, 0103 physical sciences, medicine, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleus, ODD-A
Abstract: New positive-parity states, having a bandlike structure, were observed in $^{105}\mathrm{Ru}$. The nucleus was produced in an induced fission reaction, and the prompt $\ensuremath{\gamma}$-rays, emitted from the fragments, were detected by the EUROBALL III multidetector array. The partial scheme of excited $^{105}\mathrm{Ru}$ levels is analyzed within the triaxial-rotor-plus-particle approach.
Published: 2014

15. Angular momentum population in the projectile fragmentation of U238 at 750MeV∕nucleon

Author: K. Gladnishki, Z.s. Podolyák, P. Regan, J. Gerl, M. Hellström, Y. Kopatch, S. Mandal, M. Górska, R. Page, H. Wollersheim, A. Banu, G. Benzoni, H. Boardman, J. Ekman, C. Fahlander, H. Geissel, H. Grawe, E. Kaza, A. Korgul, M. Matos, M. Mineva, C. Pearson, C. Plettner, D. Rudolph, C.h. Scheidenberger, K. H. Schmidt, V. Shishkin, D. Sohler, K. Sümmerer, J. Valiente Dobón, P. Walker, H. Weick, M. Winkler, O. Yordanov, LA COMMARA, MARCO, K., Gladnishki, Podolyák, Z. s., P., Regan, J., Gerl, M., Hellström, Y., Kopatch, S., Mandal, M., Górska, R., Page, H., Wollersheim, A., Banu, G., Benzoni, H., Boardman, LA COMMARA, Marco, J., Ekman, C., Fahlander, H., Geissel, H., Grawe, E., Kaza, A., Korgul, M., Mato, M., Mineva, C., Pearson, C., Plettner, D., Rudolph, Scheidenberger, C. h., K. H., Schmidt, V., Shishkin, D., Sohler, K., Sümmerer, J., Valiente Dobón, P., Walker, H., Weick, M., Winkler, and O., Yordanov
Published: 2004

16. Study of the spallation of 136Xe in collision with 1H and 12C at 1 GeV per nucleon

Author: M. D. Salsac, C. Caesar, B. Czech, Herbert A. Simon, S. Bianchin, S. Hlavac, Christoph Langer, O. Yordanov, O. Borodina, Sylvie Leray, T. Le Bleis, Thomas Aumann, Piotr Pawłowski, E. Casajeros, Yassid Ayyad, T. Gorbinet, Alain Boudard, J.E. Ducret, J. Lukasik, N. Kurz, S. Pietri, Martin Veselsky, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay
Subjects: Physics, Photon, Proton, 010308 nuclear & particles physics, Projectile, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Condensed Matter Physics, 01 natural sciences, Atomic and Molecular Physics, and Optics, Nuclear physics, Dipole magnet, 0103 physical sciences, Neutron, Spallation, Atomic physics, 010306 general physics, Nucleon, Nuclear Experiment, Mathematical Physics, Excitation
Abstract: International audience; The collision of 136Xe with a proton and with 12C at 1 GeV per nucleon has been studied in inverse kinematics with the SPALADIN setup at GSI. The detection in coincidence of the final state fragments (projectile residues, neutrons and Z ⩾ 2 charged fragments) with a large geometrical efficiency is provided by the inverse kinematics combined with a large-aperture dipole magnet and large detectors. Such a coincidence, measured on an event basis, allows us to select the excitation energy of the prefragment formed after the nuclear cascade and study its different de-excitation channels such as evaporation of light particles, asymmetric binary decay or multifragmentation. After a short summary of spallation reactions modeling, followed by the description of the setup, some preliminary results will be shown including the cross-sections of the reaction on the proton, compared in particular to other measurements as well as the cross-sections for the various fragment multiplicities. In the last section, we explain our method for the selection of the prefragment excitation energy and give a hint of the variables available in our experiment to study the excitation energy dependence of the prefragment de-excitation mechanism for both reactions.
Published: 2012

17. Heavy-ion test of detectors with conventional and resistive Micromegas used in TPC configuration

Author: P. Legou, BronisŁaw Czech, Vladislav Matoušek, O. Yordanov, Pascal Le Bourlout, Jean-Éric Ducret, Michel Combet, T. Gorbinet, S. Leray, Marie-Delphine Salsac, Piotr PawŁowski, J. Lukasik, Robert Durand, A. Boudard, François Nizery, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Département d'Electronique, des Détecteurs et d'Informatique pour la Physique (ex SEDI) (DEDIP), Institute of Nuclear Physics IFJ-PAN, Institute of Physics, Slovak Academy of Sciences, Slovak Academy of Science [Bratislava] (SAS), Département d'Ingénierie des Systèmes (ex SIS) (DIS), 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), Institute of Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Bulgarian Academy of Sciences (BAS), 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, Nuclear and High Energy Physics, Resistive touchscreen, 010308 nuclear & particles physics, business.industry, Detector, MicroMegas detector, STRIPS, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Synchrotron, law.invention, Printed circuit board, law, 0103 physical sciences, Optoelectronics, Heavy ion, Electronics, 010306 general physics, business, Instrumentation
Abstract: We have performed tests of Micromegas detector prototypes using the heavy-ion beams from the SIS synchrotron of GSI (Darmstadt, Germany). The beams varied from C 6 + 12 to Au 65 + 179 and from 250 to 1000 MeV per nucleon. We have tested two amplification technologies, conventional and resistive Micromegas, and two construction concepts, bulk-Micromegas and micro-meshes screwed on the PCB. The obtained position resolution below 200 μ m for 5 mm wide strips implies that the bulk resistive Micromegas technology might meet the requirements of the future R3B TPC project. We also developed a fast and very low noise front-end electronics connected directly to the Printed Circuit Board (PCB) of the detector itself. This concept has shown very good performances and robustness.
Published: 2011

18. Approaching r-process nuclei at N=126

Author: B. Jurado, K.-H. Schmidt, A. I. Morales, B. Blank, Enrique Casarejos, J. Giovinazzo, F. Rejmund, L Langanke, L. Audouin, F. Becker, Daniela Henzlova, O. Yordanov, J. Pereira, Ivan Borzov, J. Benlliure, H. Alvarez-Pol, P. Napolitani, B. Fernández, D. Cortina-Gil, T. Kurtukian-Nieto, Gabriel Martínez-Pinedo, 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), Noyaux exotiques (NEX), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), Aval du cycle et Energie Nucléaire (ACEN), 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), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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, History, 010308 nuclear & particles physics, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Computer Science Applications, Education, Nuclear physics, 0103 physical sciences, 25.75.-q, 27.90.+b, 95.30.Cq, 25.70.Mn, 27.60.+j, r-process, Nuclide, Atomic physics, 010306 general physics, Nuclear Experiment
Abstract: International audience; The production of heavy neutron-rich nuclei approaching the r-process waiting point at N$\approx$126 has been investigated in fragmentation reactions of relativistic 238U and 208Pb projectiles. Using this technique we were able to identify 73 new heavy neutron-rich nuclei expanding considerably the north-west frontier of the chart of nuclide. Moreover, we were able to determine the half lives of 13 of those nuclides. The measured values are significantly shorter than the predictions used for r-process model calculations. These shorter half lives are understood as due to the role of first-forbidden transitions in the decays of these nuclei. The confirmation of these results for r-process nuclei at N$\approx$126 would indicate that the r-process at this point is faster than expected, leading to a larger production of the heaviest nuclei.
Published: 2011

19. Progress in nuclei approaching the r-process waiting point at A=195

Author: J. Benlliure, F. Becker, Daniela Henzlova, Enrique Casarejos, M. Fernandez-Ordoñez, B. Blank, O. Yordanov, F. Rejmund, J. Giovinazzo, D. Cortina-Gil, L. Audouin, T. Kurtukian-Nieto, B. Jurado, K. Schmitt, and J. Pereira
Subjects: Nuclear physics, Physics, Astrophysics and Astronomy, r-process, Point (geometry)
Published: 2010

20. Production of new neutron-rich isotopes of heavy elements in fragmentation reactions ofU238projectiles at 1AGeV

Author: K.-H. Schmidt, Enrique Casarejos, F. Rejmund, D. Cortina-Gil, B. Fernández-Domínguez, P. Napolitani, B. Jurado, L. Audouin, H. Alvarez-Pol, J. Pereira, Arnd R. Junghans, T. Enqvist, J. Benlliure, and O. Yordanov
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, Isotopes of uranium, Isotope, 010308 nuclear & particles physics, Projectile, 7. Clean energy, 01 natural sciences, Nuclear physics, Fragmentation (mass spectrometry), 0103 physical sciences, Neutron, Production (computer science), Isotopes of gold, 010306 general physics
Abstract: The production of heavy neutron-rich nuclei has been investigated using cold-fragmentation reactions of {sup 238}U projectiles at relativistic energies. The experiment performed at the high-resolving-power magnetic spectrometer Fragment Separator at GSI made it possible to identify 40 new heavy neutron-rich nuclei: {sup 205}Pt, {sup 207-210}Au, {sup 211-216}Hg, {sup 214-217}Tl, {sup 215-220}Pb, {sup 219-224}Bi, {sup 223-227}Po, {sup 225-229}At, {sup 230,231}Rn, and {sup 233}Fr. The production cross sections of these nuclei were also determined and used to benchmark reaction codes that predict the production of nuclei far from stability.
Published: 2010

21. Structural effects in the nuclide distributions of the residues of highly excited systems

Author: A.V. Ignatyuk, M. V. Ricciardi, P. Napolitani, O. Yordanov, Aleksandra Kelić, Kjeld Schmidt, C. Villagrasa, F. Rejmund, L. Tassan-Got, Institut de Physique Nucléaire d'Orsay (IPNO), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Physics, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, technology, industry, and agriculture, General Physics and Astronomy, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Molecular physics, Fragmentation (mass spectrometry), Excited state, 0103 physical sciences, Nuclide, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment
Abstract: New data from GSI on the production-cross-section for fragmentation of the systems 56Fe+p and 56Fe+Ti at 1 A GeV revealed the appearance of even-odd staggering in the cross-section distribution for chains of isotopes with given N-Z. The staggering is strongly enhanced for the chain N=Z, it reduces as the production moves away from the N=Z chain, and it reverses for the most neutron-rich odd-A residues. These phenomena, observed in the residues of rather violent reactions, are related to structural effects in the level-densities below the particle-emission threshold., 4 pages, 2 figures. 10th Nuclear Physics Workshop of Marie and Pierre Curie, 24 - 28 Septembre 2003, Kazimierz Dolny (Poland)
Published: 2010

22. Study of deep subcritical electronuclear systems and feasibility of their application for energy production and radioactive waste transmutation

Author: Jindrich. Adam, Baldin, Anton Alexandrovich, N. Vladimirova, N. A. Gundorin, B. Guskov, V. Dyachenko, A.F. Elishev, M. Kadykov, E. Kostyuhov, V. Kransov, I. Marin, V. S. Pronskikh, Rogov, Anatoly, A. A. Solnyshkin, V. I. Stegailov, S. G. Stetsenko, S. Tyutyunikov, Furman, Walter, Tsoupko-Sitnikov, Vsevolod Mikhailovich, E. M. Belov, M. Galanin, V. Kolesnikov, N. Ryazansky, S. Solodchenkova, B. Fonarev, V. Chilap, A. Chinenov, Baldina, Elina, A. Balabekyan, Karapetyan, Gayane, I. Zhuk, S. V. Korneev, A.S. Potapenko, A. Safronova, V. N. Sorokin, V. V. Sorokin, A.M. Khilmanovich, B. Marcynkevich, Korbut, Tamara, Ch. Stoyanov, L. Kostov, Zhivkov, Petar, O. Yordanov, S Batzev, Ch. Protohristov, A. Kugler, V. Wagner, Majerle, Mitja, Krása, Antonín, O. Svoboda, Katovsky, Karel, O. Schasny, A. Tuleushev, Gudima, Konstantin, M. I. Baznat, Ravdandorj Togoo, D. Otgonsuren, Ts Tumendelger, Ts. Damdinsuren, M. Shuta, Elzbieta Strugalska-Gola, Stanisław Kilim, M. Bielewicz, A. Wojeciechowsky, V. A. Voronko, Sotnikov, Vladimir, V.V. Sidorenko, Haysak, Ivan, Hashemi-Nezhad, Reza, Y. Borger, W. Westmeier, H. Robotham, W. Ensinger, Severin, Daniel, M. Rossbah, B. Thomauske, Zamani, Masoud, Manolopoulou, Metaxia, S. Stoulos, M. Fragopolou, S. Jokic, Harphool Kumawat, V. Kumar, and M. Sharma
Published: 2010
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23. Magnetic dipole sequences inRb83

Author: M. Hausmann, N. Marginean, Ronald Schwengner, D. R. Napoli, O. Yordanov, M. Axiotis, K. P. Lieb, G. Rainovski, G. de Angelis, Andreas Wagner, A. Jungclaus, C. Rossi Alvarez, F. Brandolini, F. Dönau, H. Schnare, and S. Frauendorf
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Isotope, Magnetic rotation, Excited state, SHELL model, Parity (physics), Nuclide, Atomic physics, Magnetic dipole, Beam (structure)
Abstract: High-spin states in {sup 83}Rb were populated in the reaction {sup 11}B+{sup 76}Ge at beam energies of 45 and 50 MeV. {gamma} rays were detected with the spectrometer GASP. The level scheme of {sup 83}Rb was extended up to 13.9 MeV. Mean lifetimes of 23 levels were determined using the Doppler-shift-attenuation method. Among the bands newly established is a sequence comprising intense M1 transitions and crossover E2 transitions. This sequence turns out to be irregular and thus shows that magnetic rotation as observed in the neighboring odd-odd isotopes is not realized in this odd-even nuclide. Excited states in {sup 83}Rb were interpreted in terms of the shell model using the model space {pi}(0f{sub 5/2},1p{sub 3/2},1p{sub 1/2},0g{sub 9/2}) {nu}(1p{sub 1/2},0g{sub 9/2}). The configurations predicted for the negative-parity M1 sequence reproduce the M1 transition strengths fairly well.
Published: 2009

24. Residual Nuclei Production in the reaction 136Xe+ deuterium at 500 A MeV

Author: J. A. Alcántara-Núñez, J. Benlliure, D. Pérez-Loureiro, P. Armbruster, L. Audouin, M. Bernas, A. Boudard, E. Casarejos, T. Enqvist, B. Fernández-Domínguez, M. Fernández Ordóñez, A. Heinz, V. Henzl, D. Henzlova, A. Kelić, A. Lafriaskh, S. Leray, P. Napolitani, J. Pereira, R. Pleskač, F. Rejmund, M. V. Ricciardi, C. Stéphan, K.-H. Schmidt, C. Schmitt, L. Tassan-Got, C. Villagrasa, C. Volant, O. Yordanov, J. A. Caballero, C. E. Alonso, M. V. Andrés, J. E. García Ramos, F. Pérez-Bernal, 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 de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Helmholtz zentrum für Schwerionenforschung GmbH (GSI), J.A. Caballero, C.E. Alonso, M.V. Andres, J.E. Garcia Ramos, F. Rérez-Bernal, 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, Chemistry, 28.41.Kw, 26.40.Sc, 29.40.Cs, 29.40.Mc, Nuclear Theory, Radiochemistry, Separator (oil production), scintillators, Scintillator, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ionisation chamber, Particle detector, Isotope separation, law.invention, spallation (nuclear), Nuclear physics, Fragmentation (mass spectrometry), Deuterium, law, Physics::Accelerator Physics, Spallation, Nuclear Experiment, Radioactive ion beams
Abstract: International audience; More than six hundred nuclei produced in the fragmentation of 136Xe projectiles at 500 A MeV on a liquid deuterium target were identified using inverse kinematics at the GSI Fragment Separator (FRS). These data are relevant for understanding of spallation reactions.
Published: 2009

25. Production of medium-mass neutron-rich nuclei in reactions induced byXe136projectiles at 1AGeV on a beryllium target

Author: F. Rejmund, J. Pereira, O. Yordanov, C. Villagrasa, T. Enqvist, Daniela Henzlova, C. Schmitt, Enrique Casarejos, Andreas Martin Heinz, K.-H. Schmidt, A. Kelic, Alain Boudard, L. Tassan-Got, C. Stéphan, C. Volant, P. Napolitani, L. Audouin, J.E. Ducret, J. Benlliure, S. Leray, M. V. Ricciardi, M. Fernandez-Ordoñez, and V. Henzl
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Fission, Nuclear Theory, chemistry.chemical_element, Fission product yield, 01 natural sciences, Nuclear physics, Uranium-238, chemistry, Fragmentation (mass spectrometry), 0103 physical sciences, r-process, Neutron, Nuclide, Beryllium, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract: Production cross sections of medium-mass neutron-rich nuclei obtained in the fragmentation of $^{136}\mathrm{Xe}$ projectiles at 1 $A$ GeV have been measured with the FRagment Separator (FRS) at GSI. The measured cross sections are compared to $^{238}\mathrm{U}$ fission yields and model calculations to determine the optimum reaction mechanism to extend the limits of the chart of the nuclides around the r-process waiting point at $N=82$.
Published: 2008

26. Recent progress in measuring β half-lives of nuclei approaching the r-process waiting point A = 195

Author: F. Rejmund, O. Yordanov, Karlheinz Langanke, K.-H. Schmidt, T. Kurtukian-Nieto, B. Blank, Gabriel Martínez-Pinedo, F. Becker, M. Fernandez-Ordoñez, J. Benlliure, J. Giovinazzo, Enrique Casarejos, L. Audouin, J. Pereira, Ivan Borzov, B. Jurado, Daniela Henzlova, Universidade de Santiago de Compostela [Spain] (USC ), 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), Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut für Kernphysik, Technische Universität Darmstadt - Technical University of Darmstadt (TU Darmstadt), 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), USC, Universidad de Santiago de Compostela, Universidad Santiago de Compostela, 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), Technische Universität Darmstadt (TU Darmstadt), 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, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, Double beta decay, 0103 physical sciences, r-process, Nuclide, 010306 general physics, Nuclear Experiment
Abstract: Heavy neutron-rich nuclei close to N = 126 were produced by fragmentation of a 1 A GeV 208 Pb beam at the FRS at GSI. The β-decay half-lives of 8 nuclides have been determined using a novel numerical analysis method. The comparison of the data with model calculations provides indications on the importance of first-forbidden transitions around A = 195 . The measured data indicate that the matter flow in the r-process to heavier fissioning nuclei may be faster than previously expected.
Published: 2008

27. Experimental investigation of the residues produced in the136Xe+Pband124Xe+Pbfragmentation reactions at1AGeV

Author: Arnd R. Junghans, A. Boudard, Enrique Casarejos, B. Jurado, M. F. Ordonez, L. Audouin, F. Rejmund, O. Yordanov, D. Henzlova, A. Krasa, R. Pleskac, Andreas Wagner, J. Benlliure, J. Pereira, J.-E. Ducret, A. Kelic, L. Tassan-Got, C. Stephan, Ch. Schmitt, P. Napolitani, M. V. Ricciardi, C. Volant, S. Leray, T. Enqvist, V. Henzl, Andreas Martin Heinz, T. Kurtukian, K.-H. Schmidt, and C. Villagrasa
Subjects: Nuclear reaction, Physics, Nuclear and High Energy Physics, Isotope, Spectrometer, 010308 nuclear & particles physics, Stable isotope ratio, Charge density, 01 natural sciences, 7. Clean energy, Nuclear physics, Fragmentation (mass spectrometry), 0103 physical sciences, Isotopes of xenon, Nuclide, 010306 general physics
Abstract: The nuclide cross sections and longitudinal velocity distributions of residues produced in the reactions of {sup 136}Xe and {sup 124}Xe at 1A GeV in a lead target were measured at the high-resolution magnetic spectrometer, the fragment separator (FRS) of GSI. The data cover a broad range of isotopes of the elements between Z=3 and Z=56 for {sup 136}Xe and between Z=5 and Z=55 for {sup 124}Xe, reaching down to cross sections of a few microbarns. The velocity distributions exhibit a Gaussian shape for masses above A=20, while more complex behavior is observed for lighter masses. The isotopic distributions for both reactions preserve a memory on the projectile N/Z ratio over the whole residue mass range.
Published: 2008

28. Production cross-sections of neutron-rich Pb and Bi isotopes in the fragmentation of 238U

Author: Enrique Casarejos, K.-H. Schmidt, B. Jurado, F. Rejmund, D. Cortina-Gil, J. Benlliure, J. Pereira, O. Yordanov, B. Fernández, P. Napolitani, H. Alvarez-Pol, T. Enqvist, Arnd R. Junghans, L. Audouin, Universidade de Santiago de Compostela [Spain] (USC ), 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), Helmholtz zentrum für Schwerionenforschung GmbH (GSI), University of Washington [Seattle], 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), 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), USC, Universidad de Santiago de Compostela, Universidad Santiago de Compostela, 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), 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), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, Hadron, chemistry.chemical_element, 25.70.Mn, 27.80.+w, 27.90.+b, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Bismuth, Nuclear physics, chemistry, Fragmentation (mass spectrometry), Projectile and target fragmentation, 0103 physical sciences, Nuclear fusion, Neutron, Beryllium, 010306 general physics
Abstract: International audience; Neutron-rich lead and bismuth isotopes have been produced by cold-fragmentation reactions induced by 238U projectiles at 1AGeV impinging on a beryllium target. The high-resolving power FRagment Separator (FRS) at GSI allowed us to identify and determine the production cross-sections of 43 nuclei, nine of them for the first time (216,217,218,219Pb and 219,220,221,222,223Bi). These data are compared to other previously measured cross-sections in similar reactions and model calculations.
Published: 2008

29. Coincidence Measurement of Residues and Light Particles in the ReactionFe56+pat 1 GeV per Nucleon with the Spallation Reactions Setup SPALADIN

Author: C. Schwarz, S. Leray, W. Trautmann, F. Rejmund, S. Pietri, Piotr Pawłowski, L. Donadille, A. Lafriakh, U. Lynen, J. Benlliure, M. Böhmer, Herbert A. Simon, C.O. Bacri, O. Yordanov, Roman Gernhäuser, J.E. Ducret, K. Kezzar, S. Bianchin, A. Boudard, F. Lavaud, T. Kurtukian-Nieto, E. Le Gentil, J. Brzychczyk, J. Lukasik, W. F. J. Müller, E. Casarejos, Michel Combet, M. Fernandez-Ordoñez, J. Luhning, Håkan T Johansson, C. Sfienti, A. Le Fèvre, Thomas Aumann, and C. Volant
Subjects: Nuclear reaction, Physics, Angular momentum, Photon, 010308 nuclear & particles physics, Nuclear Theory, General Physics and Astronomy, Kinetic energy, 01 natural sciences, Nuclear physics, Cascade, 0103 physical sciences, Spallation, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Excitation
Abstract: The spallation of Fe-56 in collisions with hydrogen at 1A GeV has been studied in inverse kinematics with the large-aperture setup SPALADIN at GSI. Coincidences of residues with low-center-of-mass kinetic energy light particles and fragments have been measured allowing the decomposition of the total reaction cross section into the different possible deexcitation channels. Detailed information on the evolution of these deexcitation channels with excitation energy has also been obtained. The comparison of the data with predictions of several deexcitation models coupled to the INCL4 intranuclear cascade model shows that only GEMINI can reasonably account for the bulk of collected results, indicating that in a light system with no compression and little angular momentum, multifragmentation might not be necessary to explain the data.
Published: 2008

30. Measurement of the complete nuclide production and kinetic energies of the systemXe136+hydrogen at 1 GeV per nucleon

Author: Andreas Martin Heinz, A. Lafriaskh, L. Audouin, M. Fernández Ordóñez, B. Fernandez, C. Villagrasa, C. Stephan, J. Benlliure, P. Napolitani, K.-H. Schmidt, T. Enqvist, J. Pereira, Daniela Henzlova, O. Yordanov, C. Schmitt, M. Bernas, R. Pleskac, E. Casarejos, P. Armbruster, A. Boudard, A. Kelic, V. Henzl, L. Tassan-Got, F. Rejmund, M. V. Ricciardi, C. Volant, and S. Leray
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Fission, Nuclear Theory, Kinetic energy, 7. Clean energy, 01 natural sciences, Nuclear physics, Stable nuclide, 0103 physical sciences, Mass spectrum, Spallation, Neutron, Nuclide, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon
Abstract: We present an extensive overview of production cross sections and kinetic energies for the complete set of nuclides formed in the spallation of {sup 136}Xe by protons at the incident energy of 1 GeV per nucleon. The measurement was performed in inverse kinematics at the GSI fragment separator. Slightly below the Businaro-Gallone point, {sup 136}Xe is the stable nuclide with the largest neutron excess. The kinematic data and cross sections collected in this work for the full nuclide production are a general benchmark for modeling the spallation process in a neutron-rich nuclear system, where fission is characterized by predominantly mass-asymmetric splits.
Published: 2007

31. Coincidence measurement of residues and light particles in the reaction 56Fe+p at 1 GeV per nucleon with the spallation reactions setup SPALADIN

Author: E, Le Gentil, T, Aumann, C O, Bacri, J, Benlliure, S, Bianchin, M, Böhmer, A, Boudard, J, Brzychczyk, E, Casarejos, M, Combet, L, Donadille, J E, Ducret, M, Fernandez-Ordoñez, R, Gernhäuser, H, Johansson, K, Kezzar, T, Kurtukian-Nieto, A, Lafriakh, F, Lavaud, A, Le Fèvre, S, Leray, J, Lühning, J, Lukasik, U, Lynen, W F J, Müller, P, Pawlowski, S, Pietri, F, Rejmund, C, Schwarz, C, Sfienti, H, Simon, W, Trautmann, C, Volant, and O, Yordanov
Abstract: The spallation of 56Fe in collisions with hydrogen at 1A GeV has been studied in inverse kinematics with the large-aperture setup SPALADIN at GSI. Coincidences of residues with low-center-of-mass kinetic energy light particles and fragments have been measured allowing the decomposition of the total reaction cross section into the different possible deexcitation channels. Detailed information on the evolution of these deexcitation channels with excitation energy has also been obtained. The comparison of the data with predictions of several deexcitation models coupled to the INCL4 intranuclear cascade model shows that only GEMINI can reasonably account for the bulk of collected results, indicating that in a light system with no compression and little angular momentum, multifragmentation might not be necessary to explain the data.
Published: 2007

32. Residue production in 136Xe + p spallation reaction

Author: P. Napolitani, Andreas Martin Heinz, Enrique Casarejos, T. Enqvist, O. Yordanov, T. Kurtukian, M. Bernas, R. Pleskac, J. Pereira, M. Fernandez-Ordonez, P. Armbruster, C. Volant, D. Henzlova, V. Henzl, A. Junghans, A. Boudard, B. Jurado, A. Kelic, C. Stéphan, L. Tassan-Got, M. V. Ricciardi, L. Giot, A. Wagner, L. Audouin, J.-E. Ducret, A. Krasa, J. Benlliure, K.-H. Schmidt, Ch. Schmitt, C.O. Bacri, S. Leray, F. Rejmund, C. Villagrasa, C. Paradela, Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire 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), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), and 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)
Subjects: Residue (chemistry), Engineering, Waste management, Chemical engineering, business.industry, Nuclear Theory, Nuclear data, Physics::Accelerator Physics, Spallation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], business, Nuclear Experiment, 7. Clean energy
Abstract: Commune avec ACEN; International audience; A research program on spallation reactions in inverse kinematics has been performed at GSI, Darmstadt, taking advantage of the relativistic heavy-ions beams available from GSI accelerators and the high-resolution magnetic spectrometer, used to identify the reactions products in-flight and to determine their kinematical properties. In this paper, we report the results obtained up to now on the spallation reaction 136Xe on protons, focusing on 500 and 200 AMeV energies.
Published: 2007

33. New technique to determine beta half-lives in complex background conditions

Author: B. Jurado, F. Becker, M. Fernandez-Ordoñez, J. Giovinazzo, L. Audouin, Enrique Casarejos, F. Rejmund, O. Yordanov, Daniela Henzlova, K.-H. Schmidt, B. Blank, D. Cortina-Gil, T. Kurtukian-Nieto, J. Benlliure, and J. Pereira
Subjects: Projectile, Chemistry, Nuclear data, Synchrotron, Spectral line, Computational physics, law.invention, law, Beta (plasma physics), Point (geometry), Nuclear Experiment, Simulation, Beam (structure), Free parameter
Abstract: Very neutron-rich nuclei near the A = 195 r-process waiting point were produced as projectile fragments from a 208 Pb primary beam at GSI, Darmstadt, by cold fragmentation. After in-flight separation, the fragments were implanted in an active catcher, and time correlations to the subsequent beta-decay were established. Due to the periodic operation cycles of the synchrotron, providing the primary beam, the background shows a complex time structure, which prevents applying well established analytical methods to extract the half-life information. A new mathematical analysis method has been developed, which is based on a Monte Carlo code, simulating the time sequence of implantation and beta detection according to the experimental conditions, leaving the beta lifetimes and the beta detection efficiency as free parameters. In addition, both the analysis of the experimental data and the simulation were performed in time-reversed sequence. The ratio of forward/backward time spectra contains the information of the "true" fragment-beta correlations. Half-lives were obtained from two-dimensional fits of the measured and simulated ratios of time correlations in forward- and backward-time direction by the least-squares method, being the lifetime and the beta-detection efficiency the two fitting parameters. Half-lives of 8 heavy neutron-rich nuclei approaching the r-process waiting point A = 195 have been determined.
Published: 2007

34. Production and Beta Half Lives of Nuclei Close TI the Nucleosynthesis R-Process Path at N=126

Author: J. Benlliure, M. Caamaño, E. Casarejos, D. Cortina, T. Kurtukian, M. F. Ordoñez, J. Pereira, F. Becker, D. Henzlova, B. Jurado, K. H. Schmidt, O. Yordanov, L. Audouin, F. Rejmund, Yu. E. Penionzhkevich, E. A. Cherepanov, Helmholtz zentrum für Schwerionenforschung GmbH (GSI), 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), Yu. E. Penionzhkevich, E. A. Cherepanov, 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 reaction, Physics, lead, chemistry.chemical_element, Half-life, nuclei with mass number 190 to 219, nuclear fragmentation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Beta decay, Nuclear physics, chemistry, Nucleosynthesis, Beta (plasma physics), heavy ion-nucleus reactions, r-process, radioactive decay periods, 25.70.Mn, 27.80.+w, Beryllium, Atomic physics, Radioactive decay
Abstract: International audience; Cold-fragmentation reactions of $^{208}$Pb projectiles impinging a beryllium target at 1 A GeV have been used to produce more than 190 nuclei “south” of lead, 25 of them for the first time. The beta half lives or upper limits of 13 of these new nuclei have been determined using position and time correlations between the nuclei and the betas in an active stopper. The measured half lives can only be described when first forbidden transitions are considered.
Published: 2007

35. Coincidence measurement of the reaction 56Fe+p at 1 GeV per nucleon with SPALADIN

Author: W. Trautmann, A. Le Fèvre, Thomas Aumann, R. Gernhäuser, Enrique Casarejos, S. Bianchin, Alain Boudard, U. Lynen, F. Rejmund, Herbert A. Simon, T. Kurtukian-Nieto, O. Yordanov, K. Kezzar, C.O. Bacri, J. Lukasik, C. Sfienti, J. Luhning, Håkan Johansson, J.E. Ducret, J. Benlliure, M. Böhmer, F. Lavaud, M. Fernandez-Ordoñez, L. Donadille, C. Schwarz, A. Lafriakh, S. Leray, É. Le Gentil, W. F. J. Müller, C. Volant, and S. Pietri
Subjects: Physics, Nuclear physics, Hodoscope, Nuclear data, Neutron detection, Spallation, Neutron, Nuclear Experiment, Nucleon, Coincidence, Beam (structure)
Abstract: The SPALADIN experiment using the inverse-kinematics technique where the heavy-ion beam is sent onto a liquid-hydrogen target has been carried out at GSI (Darmstadt, Germany) in order to study the spallation of 56 Fe. On an event-by-event basis, spallation residues, light-charged fragments and neutrons have been detected in coincidence. The set-up is based on a large aperture magnet (ALADiN) equipped with a time-projection chamber (TPC), a hodoscope and a high-efficiency neutron detector. The combination of the inverse kinematics and of the acceptance of the set-up focuses the measurement on the low centre-of-mass energy fragments of the reaction essentially originating from the de-excitation of the prefragment formed at the end of the intranuclear cascade. Data taken at 1GeV per nucleon have been analysed. Preliminary results on coincidence observables are shown and compared to theoretical calculations. We emphasize on the identification of different types of multi-fragment final states which correspond to different decay channels and allow to probe different decay mechanisms.
Published: 2007

36. Production of heavy neutron-rich nuclei 'south' of lead

Author: J. Giovinazzo, Daniela Henzlova, F. Becker, J. Benlliure, L. Audouin, F. Rejmund, B. Jurado, D. Cortina, Enrique Casarejos, J. Pereira, K.-H. Schmidt, B. Blank, M. Fernandez-Ordoñez, O. Yordanov, T. Kurtukian-Nieto, Department of Particle Physics, Universidade de Santiago de Compostela [Spain] (USC ), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), 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 Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and 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, 010308 nuclear & particles physics, Projectile, Nuclear Theory, 25.70.Mn, 27.70.+q, 27.80.+w, Fragmentation (computing), General Physics and Astronomy, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, Lead (geology), chemistry, Projectile and target fragmentation, 0103 physical sciences, Production (economics), General Materials Science, Neutron, Physical and Theoretical Chemistry, Beryllium, 010306 general physics, Nuclear Experiment, Radioactive beam
Abstract: International audience; The production of heavy neutron-rich nuclei is investigated using cold-fragmentation reactions. More than 25 new heavy neutron-rich nuclei were produced in the fragmentation of 208Pb projectiles at 1 A GeV impinging a beryllium target. The precise measurement of their production cross sections enables to benchmark the predictive power of different model calculations and make reliable predictions of the production rates expected in future radioactive beam facilities.
Published: 2006

37. Light nuclides produced in the proton-induced spallation ofU238at 1 GeV

Author: C. Stephan, A. Kelic, L. Tassan-Got, M. Bernas, S. Leray, M. V. Ricciardi, T. Enqvist, P. Armbruster, B. Mustapha, S. Czajkowski, J. Benlliure, K.-H. Schmidt, O. Yordanov, C. Volant, A. Boudard, J. Pereira, F. Rejmund, and R. Legrain
Subjects: Physics, Nuclear and High Energy Physics, Isotope, Proton, 010308 nuclear & particles physics, Nuclear Theory, 7. Clean energy, 01 natural sciences, Beta-decay stable isobars, Nuclear physics, Uranium-238, 0103 physical sciences, Production (computer science), Spallation, Nuclide, Nuclear Experiment, 010306 general physics, Radioactive decay
Abstract: The production of light and intermediate-mass nuclides formed in the reaction $^{1}\mathrm{H}+^{238}\mathrm{U}$ at 1 GeV was measured at the Fragment Separator at GSI, Darmstadt. The experiment was performed in inverse kinematics, by shooting a 1 A GeV $^{238}\mathrm{U}$ beam on a thin liquid-hydrogen target. A total of 254 isotopes of all elements in the range $7\ensuremath{\le}Z\ensuremath{\le}37$ were unambiguously identified, and the velocity distributions of the produced nuclides were determined with high precision. The results show that the nuclides are produced in a very asymmetric binary decay of heavy nuclei originating from the spallation of uranium. All the features of the produced nuclides merge with the characteristics of the fission products as their mass increases.
Published: 2006

38. Systematic comparison of ISOLDE-SC yields with calculated in-target production rates

Author: K.-H. Schmidt, F. Gevaert, A. Kelic, O. Yordanov, Strahinja Lukić, and M. V. Ricciardi
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, Isotope, Proton, Fission, Attenuation, Nuclear Theory, FOS: Physical sciences, Nuclear physics, Physics::Accelerator Physics, Nuclear Physics - Experiment, Neutron, Nuclide, TASK 11 [11], Nuclear Experiment (nucl-ex), Nuclear Experiment, Instrumentation, Beam (structure)
Abstract: Recently, a series of dedicated inverse-kinematics experiments performed at GSI, Darmstadt, has brought an important progress in our understanding of proton and heavy-ion induced reactions at relativistic energies. The nuclear reaction code ABRABLA that has been developed and benchmarked against the results of these experiments has been used to calculate nuclide production cross sections at different energies and with different targets and beams. These calculations are used to estimate nuclide production rates by protons in thick targets, taking into account the energy loss and the attenuation of the proton beam in the target, as well as the low-energy fission induced by the secondary neutrons. The results are compared to the yields of isotopes of various elements obtained from different targets at CERN-ISOLDE with 600 MeV protons, and the overall extraction efficiencies are deduced. The dependence of these extraction efficiencies on the nuclide half-life is found to follow a simple pattern in many different cases. A simple function is proposed to parameterize this behavior in a way that quantifies the essential properties of the extraction efficiency for the element and the target - ion-source system in question., Comment: 46 pages, 49 figures, background information on http://www-w2k.gsi.de/charms/
Published: 2006
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39. Exclusive Spallation Measurements on $^{56}$Fe+p with the SPALADIN setup

Author: F. Rejmund, E. Le Gentil, S. Leray, E. Casarejos, C.O. Bacri, C. Volant, R. Krücken, J. Benlliure, Cornelius Schwarz, A. Le Fèvre, J.-E. Ducret, Thomas Aumann, Michel Combet, A. Boudard, H. Simon, M. Fernandez-Ordoñez, S. Pietri, A. Lafriakh, M. Böhmer, C. Sfienti, J. Lukasik, A. Kelic, Roman Gernhäuser, O. Yordanov, W. Trautmann, K. Kezzar, T. Kurtukian-Nieto, Håkan T Johansson, W. F. J. Müller, Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), 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), S.V. Harissopulos, P. Demetriou, E. Julin, 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, Inverse kinematics, 020206 networking & telecommunications, Charge (physics), 02 engineering and technology, 25.40.Sc, 27.40.+z, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nuclear spallation, Coincidence, Nuclear physics, nuclei with mass number 39 to 58, iron, proton-nucleus reactions, 0202 electrical engineering, electronic engineering, information engineering, Cluster (physics), Physics::Accelerator Physics, 020201 artificial intelligence & image processing, Spallation, Atomic physics, Ion emission, Nuclear Experiment
Abstract: First coincidence data on the $^(56}$Fe+p reaction at 1 A.GeV in inverse kinematics obtained with the SPALADIN setup are presented. Data on charge correlations of cluster emissions occurring in the spallation reaction are shown and compared to spallation codes with the aim of discriminating between the various de-excitation mechanisms.
Published: 2005

40. PAIR BREAKING IN A SHEARS BAND OF 104IN

Author: T. Martinez, F. Brandolini, K. P. Lieb, O. Yordanov, A. Algora, G. A. Müller, A. Gadea, E. Galindo, A. Jungclaus, M. Hausmann, and D. N. Napoli
Subjects: Physics, Geometry
Published: 2005

41. Measurement of residual nucleus cross sections and recoil energies in p + Fe collisions at 300, 500, 750, 1000 and 1500 MeV

Author: Enrique Casarejos, K. Sümmerer, J. Pereira, O. Yordanov, F. Vivès, F. Rejmund, J. J. Connel, K.-H. Schmidt, D. Karamanis, T. Enqvist, M.S. Pravikoff, K. Helariutta, C. Villagrasa, C. Volant, J.E. Ducret, L. Tassan-Got, W. Wlazlo, F. Hammache, Mark E. Wiedenbeck, M. Fernandez, Arnd R. Junghans, J. Benlliure, B. Jurado, A. Boudard, S. Leray, J. S. George, M. V. Ricciardi, N. Yanazak, S. Czajkowski, L. Audouin, C. Stephan, L. Ferran, R. A. Mewaldt, B. Fernandez, A. M. Heinz, P. Armbruster, Thomas Faestermann, Haight, R. C., Chadwick, M. B., Kawano, T., Talou, P., Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), and Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Isotope, 010308 nuclear & particles physics, 25.40.Sc, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Residual, 7. Clean energy, 01 natural sciences, Nuclear physics, Recoil, medicine.anatomical_structure, 0103 physical sciences, medicine, Spallation, Iron Isotopes, Atomic physics, 010303 astronomy & astrophysics, Nucleus
Abstract: PACS; International audience; The production of residual nuclei in p + Fe collisions has been measured at GSI on the FRS facility by means of the reverse kinematic techniques at 300, 500, 750, 1000 and 1500 MeV/A. The cross-sections larger than 0.01 mb of all isotopes with Z larger than 8 have been obtained. Velocity distributions were also measured. Comparisons to models describing spallation reactions and some empirical formulae often used in astrophysics are presented. These data are directly used to calculate impurety production and DPAs in a thin window as foreseen in spallation sources or accelerator-driven systems
Published: 2005

42. Production and half-lives on neutron-rich isotopes near N=126

Author: O. Yordanov, F. Becker, J. Giovinazzo, D. Henzlova, Enrique Casarejos, K.-H. Schmidt, J. Pereira, B. Blank, J. Benlliure, L. Audouin, M. Fernandez-Ordoñez, B. Jurado, D. Cortina-Gil, T. Kurtukian-Nieto, F. Rejmund, Z. Gacsi, Z. Dombradi, A. Krasznahorkay, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), and Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Isotope, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Radiochemistry, 27.80.+w, 25.70.Mn, 23.40.-s, 21.10.Gv, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Beta decay, Nuclear physics, chemistry, Fragmentation (mass spectrometry), Double beta decay, 0103 physical sciences, r-process, Neutron, Beryllium, Nuclear Experiment, 010306 general physics, Open shell
Abstract: Communication commune avec l'équipe de recherche ACEN du CENBG; International audience; Heavy neutron-rich nuclei close to the neutron closed shell N = 126 were produced by fragmentation of a 1 A GeV 208Pb beam in a beryllium target at the Fragment Separator at GSI. Around 30 heavy neutron-rich isotopes have been synthesized for the first time and the half-lives of some of them have been determined.
Published: 2005

43. Isomers in neutron-rich A approx 190 nuclides from 208Pb fragmentation

Author: K. Schmidt, Henryk Mach, J. Benlliure, M. Sawicka, C. Wheldon, D. D. Warner, Alison Bruce, M Rejmund, O. Yordanov, Philip M Walker, JG Narro, J. Giovinazzo, DC Gil, F. Vivés, Hans Geissel, C Fox, K. H. Schmidt, W. Gelletly, D. M. Cullen, Paul Stevenson, H. J. Wollersheim, Milena Mineva, Ani Aprahamian, P. H. Regan, W. Korten, Margareta Hellström, F {Rejmund}, J. Döring, F. de Oliveira, H. Grawe, C.D. O'Leary, S. C. Wooding, C. J. Pearson, M. Pfützner, A Kleinbohl, Robert Grzywacz, P. A. Butler, R. Lucas, T. Enqvist, P. Mayet, M. Lewitowicz, Zs. Podolyák, J. Gerl, Ch. Theisen, M. Górska, C Schlegel, H. Schaffner, M. Caamaño, Furong Xu, 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), 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), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-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, Nuclear and High Energy Physics, Spectrometer, Isotope, 010308 nuclear & particles physics, Hadron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Ion, Nuclear physics, Fragmentation (mass spectrometry), Excited state, 0103 physical sciences, Neutron, Nuclide, Atomic physics, 010306 general physics, 21.10.Tg - Lifetimes. 23.20.Lv - γ transitions and level energies. 25.70.Mn - Projectile and target fragmentation
Abstract: Relativistic projectile fragmentation of Pb-208 has been used to produce isomers in neutron-rich, A approximate to 190 nuclides. A forward-focusing spectrometer provided ion-by-ion mass and charge identification. The detection of gamma-rays emitted by stopped ions has led to the assignment of isomers in Ta-188, W-190, Re-192, Re-193, Os-195, Ir-197, Ir-198, Pt-200, Pt-201, Pt-202 and Au-203, with half-lives ranging from approximately 10 ns to 1 ms. Tentative isomer information has been found also for Er-174, Er-175, Hf-185, Re-191, Re-194 and Ir-199. In most cases, time-correlated, singles gamma-ray events provided the first spectroscopic data on excited states for each nuclide. In Pt-200 and Pt-201. the assignments are supported by gamma-gamma coincidences. Isomeric ratios provide additional information, such as half-life and transition energy constraints in particular cases. The level structures of the platinum isotopes are discussed, and comparisons are made with isomer systematics.
Published: 2005

44. Basic Research at GSI for the Transmutation of Nuclear Waste in Accelerator Driven Reactor Systems (ADS)

Author: M. Bernas, L. Donadille, B. Mustapha, K. Helariutta, W. Wlazlo, C. Villagrasa, Enrique Casarejos, J. Pereira, B. Fernandez, R. Legrain, S. Leray, L. Audouin, T. Enqvist, O. Yordanov, A. Boudard, F. Vivès, S. Czajkowski, J. Taieb, C. Volant, P. Armbruster, P. Napolitani, K.-H. Schmidt, J. Benlliure, A. Kelic, L. Tassan-Got, C. Stephan, M.S. Pravikoff, M. V. Ricciardi, F. Rejmund, and B. Jurado
Subjects: education.field_of_study, Nuclear transmutation, business.industry, Nuclear engineering, Fossil fuel, Population, Radioactive waste, Nuclear power, Renewable energy, Electricity generation, Environmental science, business, education, MOX fuel
Abstract: The still increasing and developing world population demands more energy. Further burning of coal, oil and gas produces still more CO2 deteriorating the climate. Anyhow, oil and gas will run out in the middle of the century. Planning a decent future with a minimum supply of energy for those who will follow us, requires re-examining all possibilities of non-polluting, renewable, and sustainable energies including nuclear options. There are two nuclear reactions which allow for a long-term exploitation: (i) converting H into He by fusion or (ii) converting U and Th into Pu and U to be burnt by fission. In this paper, the fission option is the target. The real long-term reserves of fission energy lie in the even-even isotopes U and Th, as the supplies of U, like fossil fuels, are restricted, as well. The remaining U and available Pu could be burnt in a 3 generation of reactors (EPR) using mixed U/Pu-fuel (MOX). Aiming at a contribution of fission energy to the world electricity production of one third, that is three times more nuclear power than today, reactors of a 4 generation should be envisaged, ready to wide technological applications in the middle of the century. Such an option could be foreseen as an implement of a peaceful future.
Published: 2005

45. Coincidence Measurement of Residue, Neutrons, and Light Charged Particles in a Spallation Experiment

Author: W. F. J. Müller, J.E. Ducret, F. Rejmund, Herbert A. Simon, O. Yordanov, S. Pietri, A. Boudard, K. Kezzar, E. Le Gentil, C. Sfienti, C. Volant, W. Trautmann, S. Leray, A. Lafriakh, Håkan Johansson, A. Le Fèvre, Thomas Aumann, C.O. Bacri, C. Schwarz, J. Benlliure, M. Böhmer, Roman Gernhäuser, Michel Combet, J. Lukasik, Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), 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), R.C. Haight, P. Talou, T. Kawano, M.B. Chadwick, ALADIN, 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: Evaporation, 25.40.Sc, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nuclear spallation, 7. Clean energy, Nuclear physics, iron, proton-nucleus reactions, nuclei with mass number 6 to 19, 0202 electrical engineering, electronic engineering, information engineering, Spallation, Neutron, Nuclear Experiment, Physics, carbon, coincidence techniques, Carbon-12, 020206 networking & telecommunications, Charged particle, Neutron source, Physics::Accelerator Physics, neutron sources, 020201 artificial intelligence & image processing, Atomic physics, Radioactive decay, Excitation
Abstract: PACS; Spallation reactions are important due to their applications in various fields such as astrophysics, neutron sources, accelerator driven systems, and production of radioactive beams. To improve our understanding of the spallation mechanism a complete experiment, called SPALADIN, has been proposed, which aims at measuring as exclusively as possible the final states of the spallation reaction. This experiment has been performed at GSI using the spallation reactions $^{56}$Fe+p and $^{12}$C+p in reverse kinematics at 1 A GeV. The detection of the evaporation residues is performed with the ALADIN magnet and various detectors. The detection in coincidence of all the characteristics (type and energy) of the evaporation particles (neutrons and charged ones) and of the heavy residue should permit the reconstruction of the remnant prior to evaporation in mass, charge, and excitation energy. It will then be possible to test the modelisation of the first stage of the reaction. Furthermore it will allow study of the models describing the various decay modes of the primary residue like evaporation or Fermi break-up mechanisms for the lighter systems independently of the models of the first stage of the spallation reaction.
Published: 2004

46. Isotopically resolved residues from the fragmentation of projectiles with largely different N/Z - the isospin-thermometer method

Author: C. Villagrasa, C. Stephan, J. Benlliure, J.-E. Ducret, Enrique Casarejos, O. Yordanov, M. V. Ricciardi, S. Leray, C. Volant, K.-H. Schmidt, A. S. Botvina, C. Schmitt, Daniela Henzlova, R. Pleskac, A. Kelic, Andreas Wagner, A. Boudard, L.T. Got, Arnd R. Junghans, F. Rejmund, Andreas Martin Heinz, T. Kurtukian, B. Jurado, V. Henzl, P. Napolitani, J. Pereira, M. F. Ordonez, T. Enqvist, L. Audouin, A. Krasa, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), 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 Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and 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, Nuclear and High Energy Physics, Range (particle radiation), 010308 nuclear & particles physics, Projectile, Evaporation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Fragmentation (mass spectrometry), Thermometer, Isospin, 0103 physical sciences, Atomic physics, 010306 general physics, Excitation
Abstract: PACS; International audience; The mean N-over-Z (/Z) ratio of residues produced in the fragmentation of 136Xe (N/Z=1.519), 124Xe (N/Z=1.296) in comparison with 56Fe (N/Z=1.154) is investigated over the full range of Z. The final residues from the 136Xe projectile keep a memory on the initial N/Z. The idea to trace back the excitation energy of the fragment entering evaporation via direct exploration of the N/Z evolution in the evaporation process is investigated and applied to the data. The freeze-out temperature is deduced, which is consistent with the investigations of light and intermediate-mass fragments (IMF) in other experiments.
Published: 2004

47. Angular momentum population in the projectile fragmentation ofU238at750MeV∕nucleon

Author: Milena Mineva, H. J. Wollersheim, Margareta Hellström, M. La Commara, D. Sohler, V. Shishkin, Claes Fahlander, Yu. N. Kopatch, E. Kaza, Philip M Walker, C. Plettner, C. Scheidenberger, Dirk Rudolph, H. Weick, G. Benzoni, K. A. Gladnishki, H. Grawe, H. J. Boardman, A. Korgul, Jörgen Ekman, M. Górska, S.K. Mandal, Milan Matos, K. Sümmerer, P. H. Regan, O. Yordanov, Zs. Podolyák, J. Gerl, K.-H. Schmidt, M. Winkler, C. J. Pearson, J. J. Valiente-Dobón, Hans Geissel, A. Banu, and R. D. Page
Subjects: Physics, Nuclear and High Energy Physics, Angular momentum, education.field_of_study, Nuclear Theory, Population, Fragmentation (computing), Nanosecond, Nuclear physics, Microsecond, Physics::Atomic and Molecular Clusters, Cutoff, Atomic physics, Nuclear Experiment, Nucleon, education, Projectile fragmentation
Abstract: A systematic study of the population probabilities of nanosecond and microsecond isomers produced following the projectile fragmentation of U-238 at 750 MeV/nucleon has been undertaken at the SIS/FRS facility at GSI. Approximately 15 isomeric states in neutron-deficient nuclei around A similar to 190 were identified and the corresponding. isomeric ratios determined. The results are compared with a model based on the statistical abrasion-ablation description of relativistic fragmentation and simple assumptions concerning gamma cascades in the final nucleus (sharp cutoff). This model represents an upper limit for the population of isomeric states in relativistic projectile fragmentation. When the decay properties of the states above the isomer are taken into account, as opposed to the sharp cutoff approximation, a good agreement between the experimental and calculated angular momentum population is obtained.
Published: 2004

48. Transition strengths between particle hole excitations inRu95

Author: A. Jungclaus, C. A. Ur, M. Hausmann, T. Martinez, I. P. Johnstone, A. Fitzler, A. Dewald, A. Gadea, G. de Angelis, O. Möller, Ronald Schwengner, D. R. Napoli, K. P. Lieb, O. Yordanov, and E. Galindo
Subjects: Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Yrast, Nuclear Theory, SHELL model, 01 natural sciences, 0103 physical sciences, Particle, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Beam energy
Abstract: High-spin states of $^{95}\mathrm{Ru}$ have been populated using the $^{35}\mathrm{Cl}+^{64}\mathrm{Zn}$ reaction at a beam energy of $135\phantom{\rule{0.3em}{0ex}}\text{MeV}$. In a recoil-distance Doppler-shift experiment, the lifetimes or lifetime limits of 26 high-spin states have been measured, giving information on a total of 49 reduced transition strengths. The results are compared with shell-model calculations with different model spaces and residual interactions. Several families of states with defined proton and neutron seniorities are proposed. The $M1$ strengths in the negative-parity yrast sequence show a pronounced staggering which is reproduced by the shell-model calculations.
Published: 2004

49. Angular Momentum Population in Projectile Fragmentation

Author: Yu. N. Kopatch, P. H. Regan, Margareta Hellström, K. A. Gladnishki, M. Górska, S. K. Mandal, O. Yordanov, Zs. Podolyák, J. Gerl, H. J. Wollersheim, and K.-H. Schmidt
Subjects: education.field_of_study, Angular momentum, Spin states, Chemistry, Nuclear Theory, Population, Nuclear physics, Uranium-238, Physics::Atomic and Molecular Clusters, Cutoff, Atomic physics, Nuclear Experiment, education, Spin (physics), Projectile fragmentation, Beam (structure)
Abstract: Isomeric states in neutron‐deficient nuclei around A ≈190 have been identified following the projectile fragmentation of a relativistic energy 238U beam. The deduced isomeric ratios are compared with a model based on the abrasion‐ablation description. The experimental isomeric ratios are lower by a factor of ≈2 than the calculated ones assuming the ‘sharp cutoff’ approximation. The observation of the previously reported isomeric Iπ=43/2− state in 215Ra represents the current record for the highest discrete spin state observed following a projectile fragmentation reaction.
Published: 2004

50. Complex nuclear-structure phenomena revealed from the nuclide production in fragmentation reactions

Author: A. Kelic, F. Rejmund, M. V. Ricciardi, A.V. Ignatyuk, P. Napolitani, O. Yordanov, K.-H. Schmidt, Robert, Suzanne, 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)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Yu.P. Penionzhkevich, E.A. Cherepanov
Subjects: Nuclear reaction, Nuclear and High Energy Physics, TheoryofComputation_COMPUTATIONBYABSTRACTDEVICES, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Theory, Binding energy, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Photochemistry, 7. Clean energy, 01 natural sciences, ComputingMethodologies_ARTIFICIALINTELLIGENCE, Nuclear physics, Fragmentation (mass spectrometry), 0103 physical sciences, Nuclide, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, Projectile fragmentation, Physics, Chemistry, 010308 nuclear & particles physics, Nuclear structure, TheoryofComputation_GENERAL, 3. Good health, ComputingMethodologies_PATTERNRECOGNITION, Nuclear fission, Excitation
Abstract: Complex structural effects in the nuclide production from the projectile fragmentation of 1 A GeV 238U nuclei in a titanium target are reported. The structure seems to be insensitive to the excitation energy induced in the reaction. This is in contrast to the prominent structural features found in nuclear fission and in transfer reactions, which gradually disappear with increasing excitation energy. Using the statistical model of nuclear reactions, relations to structural effects in nuclear binding and in the nuclear level density are demonstrated., Comment: 19 pages, 14 figures, background information on http://www-w2k.gsi.de/kschmidt/
Published: 2004

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