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1. Chronology of the three-body dissociation of $^8$He

Author

Thomas Nilsson, N. Curtis, Alain Ninane, L. Stuttge, V. Bouchat, Martin Freer, W. N. Catford, Thomas Materna, F. M. Marqués, C. N. Timis, Steven Pain, V. Kinnard, P. McEwan, María José García Borge, B. Laurent, M. Labiche, E. V. Prokhorova, N. A. Orr, C. Angulo, N. M. Clarke, N. I. Ashwood, Francis Hanappe, G. Normand, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-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), 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 Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, nucl-th, Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Gaussian, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, 01 natural sciences, Dissociation (chemistry), Nuclear Theory (nucl-th), symbols.namesake, 0103 physical sciences, Phenomenological model, Nuclear Physics - Experiment, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Nuclear theory, Physics, Spacetime, 010308 nuclear & particles physics, Breakup, Nuclear Physics - Theory, symbols, Atomic physics, Ground state
Abstract

7 pags., 5 figs., 1 app., The space and time configurations of the dissociation of He into He+n+n, on C and Pb targets, have been explored simultaneously for the first time. The final-state interactions in the n-n and He-n channels are successfully described within a model that considers independent emission of neutrons from a Gaussian volume with a given lifetime. The dissociation on C target exhibits a dominant sequential decay through the ground state of He, consistent with neutrons being emitted from a Gaussian volume of fm with a n-n delay in the sequential channel of 1400 400 fm/c, in agreement with the lifetime of He. The lower-statistics data on Pb target correspond mainly to direct breakup, and are well described using the n-n volume measured, without any n -n delay. The validity of the phenomenological model used is discussed., The support provided by the technical staff of LPC and the LISE crew is gratefully acknowledged, as are the efforts of the GANIL cyclotron operation team for providing the primary beam. We also wish to express our appreciation for the vital contributions made by our late colleague and friend Jean-Marc Gautier to all the CHARISSA+DEMON experiments undertaken by our collaboration.

Published
2019

2. Features of styrene copolymerization with sodium p-styrenesulfonate in solvents of different polarities

Author

V. P. Zubov, M. G. D’yakova, V. A. Tverskoy, E. V. Prokhorova, and N. V. Shevlyakova

Subjects
Polymers and Plastics, Polarity (physics), Solvation, Styrene, Solvent, chemistry.chemical_compound, Monomer, chemistry, Polymer chemistry, Materials Chemistry, Ceramics and Composites, Copolymer, Polystyrene, Dissolution
Abstract

The copolymerization of sodium p-styrenesulfonate with styrene is studied in solvents that form homogeneous solutions with mixtures of these monomers and differ in polarity: DMFA, a mixture of 1,4-dioxane with DMF, DMSO, and a DMSO-water mixture. It is shown that the diagrams of the copolymer composition depend on the type of solvent and that their shapes do not obey the Mayo-Lewis model. The copolymers become substantially enriched with styrene units during an increase in the solvent polarity. The main cause of deviation from the classical scheme of binary copolymerization is the selective solvation of growing macroradicals with styrene. This effect becomes more pronounced during an increase in the solvent polarity and a decrease in its dissolving ability with respect to polystyrene and during polymer separation into a heterophase. This conclusion is confirmed by the dependence of the copolymer composition on the initiator concentration.

Published
2014

3. The fusion–fission and quasi-fission processes in the reaction 48Ca + 208Pb at energies near the Coulomb barrier

Author

I. V. Pokrovsky, G. N. Knyazheva, L. Krupa, Yu. Ts. Oganessian, E. M. Kozulin, V.V. Pashkevich, M. G. Itkis, I. M. Itkis, N. A. Kondratiev, A. A. Bogachev, E. V. Prokhorova, and A. Ya. Rusanov

Subjects
Nuclear physics, Nuclear reaction, Physics, Nuclear and High Energy Physics, Spectrometer, Fission, Nuclear Theory, Physics::Atomic and Molecular Clusters, Coulomb barrier, Fusion fission, Atomic physics, Nuclear Experiment, Kinetic energy
Abstract

Mass-energy distributions (MEDs) and capture-fission cross sections have been measured in the reaction 48 Ca + 208 Pb → 256 No at the energies E lab = 206 – 242 MeV using a double-arm time-of-flight spectrometer CORSET. It has been observed that MED of the fragments consists of two parts, namely, the classical fusion–fission process corresponding to the symmetric fission of 256 No and quasi-fission “shoulders” corresponding to the light fragment masses ∼ 60 – 90 u and complimentary heavy fragment masses. The quasi-fission “shoulders” have a higher total kinetic energy (TKE) as compared with that expected for the classical fission. A mathematical formalism was employed for the MEDs fragment decomposition into fusion–fission and quasi-fission components. In the fusion–fission process a high-energy Super-Short mode has been discovered for the masses M H = 130 – 135 u and the TKE of ≈ 233 MeV .

Published
2008

4. The CORSET time-of-flight spectrometer for measuring binary products of nuclear reactions

Author

Ľ. Krupa, N. A. Kondratiev, M. G. Itkis, E. M. Kozulin, E. V. Prokhorova, G. N. Knyazheva, A. A. Bogachev, I. M. Itkis, and I. V. Pokrovsky

Subjects
Physics, Nuclear reaction, Nuclear physics, Time of flight, Spectrometer, Physics::Instrumentation and Detectors, Detector, Neutron, Angular resolution, Nuclear Experiment, Instrumentation, Charged particle, Semiconductor detector
Abstract

The CORSET time-of-flight spectrometer has been developed at the Flerov Laboratory of Nuclear Reactions of the Joint Institute for Nuclear Research (Dubna, Russia) for investigating binary products of nuclear reactions. The spectrometer has been used to study the dynamics of fusion-fission and quasi-fission of superheavy elements. The design and the main characteristics of the spectrometer, as well as the algorithms for deducing the mass-energy distributions of fragments and the cross sections of nuclear reactions, are presented. The spectrometer contains two time-of-flight arms based on microchannel-plate detectors and three telescopes, each of which is composed of two microchannel-plate detectors and one semiconductor detector. A system of four semiconductor detectors is used to obtain the absolute value of a cross section. The time resolution of the time-of-flight arms is 150 ps, which allows the time-of-flight distances to be set at 10–20 cm, thus providing a mass resolution of 3 amu and an angular resolution of 0.3°. Owing to these characteristics, the spectrometer can be used as a trigger in multidetector setups for measuring light charged particles, neutrons, and γ rays in coincidence with reaction fragments.

Published
2008

5. THE PROCESS OF FUSION-FISSION OF SUPERHEAVY NUCLEI

Author

V. M. Voskresenski, N. A. Kondratiev, Yu. Ts. Oganessian, I. M. Itkis, E. M. Kozulin, L. Krupa, W. Trzaska, I. V. Pokrovsky, M. G. Itkis, E. V. Prokhorova, A. Ya. Rusanov, G. N. Knyazheva, V. A. Rubchenya, and A. A. Bogachev

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Scientific method, General Physics and Astronomy, Fusion fission
Published
2007

6. The processes of fusion-fission and quasi-fission of superheavy nuclei

Author

Yu. Ts. Oganessian, E. M. Kozulin, I. V. Pokrovsky, E. V. Prokhorova, A. Ya. Rusanov, I. M. Itkis, G. N. Knyazheva, L. Krupa, A. A. Bogachev, N. A. Kondratiev, M. G. Itkis, and J. Kliman

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Fission, Fusion fission
Published
2007

7. What can one learn about lithium breakup from the fission reaction of 232Th(6Li, f) at energies around the Coulomb barrier?

Author

G. N. Knyazheva, S.V. Zhdanov, A. Yu. Chizhov, D. M. Gorodisskiy, S.I. Mul'gin, M. G. Itkis, N. A. Kondratiev, A. A. Bogachev, V.M. Voskressenski, E. V. Prokhorova, A. Ya. Rusanov, E. M. Kozulin, I. V. Pokrovsky, L. Krupa, and I. M. Itkis

Subjects
Physics, Nuclear and High Energy Physics, Cold fission, Range (particle radiation), Cluster decay, Fission, Electric potential energy, Nuclear Theory, Coulomb barrier, chemistry.chemical_element, Nuclear physics, chemistry, Nuclear fission, Lithium, Atomic physics, Nuclear Experiment
Abstract

Fission fragment mass and energy distributions (MED) and fission fragment folding angle distributions (FFFAD) have been measured in the reaction 6Li + 232Th within the lithium projectile energy range E lab = 28.5 – 62.5 MeV . The values of the ratio between the complete and incomplete fusion cross-sections have been obtained from a combined analysis of MED and FFFAD. The incomplete fusion originates from transfer reactions and/or from the 6Li breakup mainly into α and d clusters. It has been found that the contribution of complete fusion into the total fusion–fission cross-section is only ∼ 27 % at the lithium projectile energy E lab = 28.5 MeV ( ∼ 2 MeV below the Coulomb barrier).

Published
2006

8. Capture and dissipation in the superheavy region

Author

I. V. Pokrovsky, Th. Materna, Marian Jandel, C. Schmitt, J. Pe´ter, O. Dorvaux, I. M. Itkis, J. Kliman, E. M. Kozulin, Giorgio Giardina, Yoshihiro Aritomo, L. Stuttge, A. A. Bogatchev, G. Knyajeva, E. V. Prokhorova, V. Bouchat, S. Gre´vy, F. Hanappe, V. Voskresensky, N. A. Kondratiev, N. Amar, L. Krupa, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Neutron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Atomic physics, Dissipation
Abstract

The competition between fusion-fission and quasi-fission in the reactions 48 Ca+ 208 Pb and 48 Ca+ 244 Pu(E * = 40MeV) is investigated using the pre-scission neutron multiciplicity distributions ( PSNMD ) obtained with a new analysis protocol.

Published
2004

9. Fusion-fission of Superheavy Nuclei

Author

F. Hanappe, L. Krupa, A. A. Bogatchev, V. M. Voskresenski, Yu. Ts. Oganessian, E. M. Kozulin, V. A. Ponomarenko, I. V. Korzyukov, M. G. Itkis, I. V. Pokrovski, E. V. Prokhorova, J. Kliman, A. Ya. Rusanov, A. A. Goverdovski, L. Stuttge, Giorgio Giardina, N. A. Kondratiev, Neil Rowley, Marian Jandel, I. M. Itkis, Kenton J. Moody, G. N. Kniajeva, and Th. Materna

Subjects
Physics, Fusion fission, National laboratory, Humanities
Abstract

M. G. Itkis,∗ ,a A. A. Bogatchev,a I. M. Itkis,a M. Jandel,a J. Kliman,a G. N. Kniajeva,a N. A. Kondratiev,a I. V. Korzyukov,a E. M. Kozulin,a L. Krupa,a Yu. Ts. Oganessian,a I. V. Pokrovski,a V. A. Ponomarenko,a E. V. Prokhorova,a A. Ya. Rusanov,a V. M. Voskresenski,a A. A. Goverdovski,b F. Hanappe,c T. Materna,c N. Rowley,d L. Stuttge,d G. Giardina,e and K. J. Moodyf Flerov Laboratory of Nuclear Research, JINR, 141980 Dubna, Russia Institute for Physics & Power Engineering, 249020 Obninsk, Russia Universite Libre de Bruxelles, 1050 Bruxelles, Belgium Institut de Recherches Subatomiques, F-67037 Strasbourg Cedex, France Dipartimento di Fisica dell’ Universita di Messina, 98166 Messina, Italy University of California, Lawrence Livermore National Laboratory, Livermore, California 94551, USA

Published
2002

10. Investigation of the fusion-fission reaction 12C+208Pb

Author

Luciano Calabretta, E. M. Kozulin, C. Maiolino, E. V. Prokhorova, N. A. Kondratiev, T. Yu. Tretyakova, S. P. Tretyakova, A. Ya. Rusanov, M. G. Itkis, and I. V. Pokrovski

Subjects
Nuclear and High Energy Physics, Radiation, Chemistry, Fission, Carbon-12, Fusion barrier, Fusion fission, Condensed Matter Physics, Nuclear physics, Angular distribution, medicine.anatomical_structure, Nuclear fission, medicine, General Materials Science, Angular anisotropy, Atomic physics, Nuclear Experiment, Nucleus
Abstract

For the first time the cross section and angular distributions of fission fragments have been measured for the compound nucleus 220 Ra produced in the reaction 12 C+ 208 Pb at three energy values in the range from 0.5 to 8.0 r MeV below the fusion barrier calculated in terms of the Bass model. In the investigated energy range there is a plateau characterized by the relation W (180°)/ W (90°)=1.2 in the angular anisotropy of fission fragments.

Published
2002

11. Fission of heavy and superheavy nuclei at low excitation energies

Author

G. Rudolf, Louise Stuttge, M. G. Itkis, Yu. M. Itkis, E. M. Kozulin, Yu. Ts. Oganessian, I. V. Pokrovsky, A. Kelic, E. V. Prokhorova, Luciano Calabretta, Francis Hanappe, N. A. Kondratiev, Ya Rusanov, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Heyd, Yvette

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Cold fission, Cluster decay, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Neutron emission, Fission, Nuclear Theory, Malaysia, Fission product yield, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear physics, cross-cultural communication, ICT, Innovation sociology, Neutron, Atomic physics, Nuclear Experiment, Spontaneous fission
Abstract

The talk presents the results of an investigation of the main characteristics (mass and energy distributions of fission fragments and multiplicity of neutrons) of the fission of the nuclei of 220 Ra, 226 Th, 256 No, 270 Sg, 286 112 produced in reactions with ions of 18 O, 22 Ne and 48 Ca at energies close to and essentially below the Coulomb barrier. The data obtained show that the form of the mass and energy distributions of the fission fragments of 226 Th and 270 Sg is accounted for by the multimodal nature of the fission. In addition, for 226 Th, a new phenomenon was established there is a significant difference between the numbers of prescission neutrons for symmetric and asymmetric fission modes. It was found that, for the low-energy fission of the nucleus of 286 112, the mass distribution of the fragments is of a clear-cut asymmetric form, contrary to what is observed for the spotaneous fission of the nuclei with Z = 100–104 and for the induced fission of 270 Sg.

Published
1999

12. Investigation of oscillations of biological tissues and their phantoms with model defects

Author

E. V. Prokhorova, M. Yu. Izosimova, and A. I. Korobov

Subjects
Materials science, Diagnostic methods, Optics, business.industry, General Physics and Astronomy, Ultrasonic sensor, Biological tissue, business, Laser Doppler vibrometer, Imaging phantom, Biomedical engineering
Abstract

The potential to create a remote, contactless, diagnostic method for biological tissues or materials with properties similar to those of biological tissues, so-called phantoms, is studied. The method is based on measurement of local oscillations of the surface of material under study under the action of acoustic and ultrasonic waves. The application of a laser-scanning vibrometer provides a means for visualization oscillations of a biological tissue phantom with model defects in the form of air bubbles, regions with higher density, and laminations, and allows determination of the positions of these defects.

Published
2007

14. DYNAMICS OF CAPTURE QUASIFISSION AND FUSION-FISSION COMPETITION

Author

G. Knyajeva, V. M. Voskresenski, V. Bouchat, Yu. Ts. Oganessian, F. Hanappe, L. Krupa, A. A. Bogatchev, E. V. Prokhorova, N. A. Kondratiev, I. V. Pokrovski, Marian Jandel, J. Kliman, L. Stuttge, Th. Materna, E. M. Kozulin, Yoshihiro Aritomo, I. M. Itkis, N. Rowley, O. Dorvaux, G. Giardina, S. Grévy, M. G. Itkis, N. Amar, J. Peter, and C. Schmitt

Subjects
Nuclear physics, Competition (economics), Physics, Dynamics (mechanics), Fusion fission
Published
2008

15. MASS-ENERGY CHARACTERISTICS OF THE REACTIONS 58<font>Fe</font>+208<font>Pb</font>->266<font>Hs</font> AND 26<font>Mg</font>+248<font>Cm</font>->274<font>Hs</font> AT COULOMB BARRIER

Author

F. Hanappe, Marian Jandel, M. G. Itkis, L. Krupa, Th. Materna, V. M. Voskresenski, N. A. Kondratiev, J. Kliman, I. M. Itkis, Yu. Ts. Oganessian, L. Stuttge, E. M. Kozulin, O. Dorvaux, C. Schmitt, G. N. Knyazheva, E. V. Prokhorova, A. Ya. Rusanov, I. V. Pokrovsky, A. A. Bogachev, Neil Rowley, and V. Bouchat

Subjects
Physics, Mass energy, Coulomb barrier, Atomic physics
Published
2008

16. THE REACTION MECHANISM IN HEAVY-ION COLLISIONS LEADING TO THE SUPERHEAVY COMPOUND SYSTEMS

Author

F. Scarlassara, A. Gadea, M. G. Itkis, G. Montagnoli, W. H. Trzaska, I. M. Itkis, B. R. Behera, J. Kliman, S. Beghini, Yu. Ts. Oganessian, E. M. Kozulin, A. A. Bogatchev, Neil Rowley, F. Hanappe, A. M. Stefanini, A. Latina, I. V. Pokrovsky, Suzana Szilner, E. V. Prokhorova, M. Trotta, E. Fioretto, A. Ya. Rusanov, N. A. Kondratiev, V. A. Rubchenya, R. N. Sagaidak, L. Stuttge, L. Krupa, G. N. Knyazheva, O. Dorvaux, and L. Corradi

Subjects
Nuclear physics, Physics, Reaction mechanism, Heavy ion, Atomic physics
Published
2008

17. ANGULAR MOMENTUM IN FISSION

Author

J. von Kalben, V. Sokolov, M. Mutterer, Valery Nesvizhevsky, S. Kadmensky, G. A. Petrov, V. Kinnard, Yu. N. Kopatch, I. S. Guseva, T. Zavarukhina, M. Sillanpää, I. Tsekhanovich, Friedrich Gönnenwein, A. M. Gagarski, Cyriel Wagemans, O. Zimmer, T. Soldner, S. V. Khlebnikov, V. A. Rubchenya, E. V. Prokhorova, W. H. Trzaska, G. Simpson, O. Dorvaux, G. Tiourine, V. Bunakov, F. Hanappe, Louise Stuttge, and H.-J. Wollersheim

Subjects
Nuclear physics, Physics, Angular acceleration, Angular momentum, Total angular momentum quantum number, Angular momentum of light, Angular momentum coupling, Rotational transition, Orbital angular momentum of light, Specific relative angular momentum
Published
2008

19. The peculiarities of the production and decay of superheavy nuclei

Author

Marian Jandel, I. M. Itkis, M. G. Itkis, G. N. Knyazheva, S. Beghini, J. Kliman, E. M. Kozulin, Louise Stuttge, E. Fioretto, O. Dorvaux, Francis Hanappe, F. Scarlassara, R. N. Sagaidak, L. Corradi, M. Trotta, V. Bouchat, C. Schmitt, N. A. Kondratiev, B. R. Behera, A. A. Bogachev, G. Montagnoli, A. Latina, Thomas Materna, Neil Rowley, Suzana Szilner, A. M. Stefanini, E. V. Prokhorova, A. Ya. Rusanov, L. Krupa, Yu. Ts. Oganessian, I. V. Pokrovsky, Corradi, L., Szilner, S., Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), L.Corradi, D.Ackermann, E. Fioretto, A.Gadea, F.Haas, G.Pollarolo, F.Scarlassara, S.Szilner, and M.Trotta

Subjects
Fission, 27.90.+b, 25.70.Jj, 25.70.Gh, 25.85.-w, Nuclear Theory, Transactinide element, magnesium, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], synthesis of superheavy nuclei, fusion-fission, quasi-fission, 01 natural sciences, 7. Clean energy, Nuclear physics, superheavy nuclei, nickel, iron, 0103 physical sciences, Nuclear fusion, fission, Neutron, titanium, 010306 general physics, Nuclear Experiment, Coalescence (physics), calcium, 010308 nuclear & particles physics, Chemistry, Observable, heavy ion fusion reactions, Atomic physics, Excitation, Radioactive decay
Abstract

The interest in the study of the fission process of superheavy nuclei mainly deals with the opportunity to obtain information about the cross-section of the compound nucleus (CN) formation at excitation energies E*\approx 15–30 MeV. It allows one to estimate the survival probability of the superheavy composite system after evaporation of 1–3 neutrons, i.e. in "cold" or "warm" fusion reactions. However, in order to solve this problem deeper understanding of the coalescence processes between colliding nuclei, the competition between fusion-fission and quasi-fission processes is needed. The characteristics of both processes, their manifestation in the experimental observables and the relative contribution to the capture cross-section in dependence on the excitation energies, reaction entrance channel etc were investigated for a wide range of target-projectile combinations. Results of the experiments devoted to the study of the fusion-fission and quasi-fission processes in the reactions of the formation of the superheavy nuclei with Z = 102–122 are presented. The heavy ions 26Mg, 48Ca, 50Ti, 58Fe and 64Ni were used as projectiles. The choice of the reactions with 48Ca and actinide-targets was inspired by the experiments on the production of the isotopes 283112, 289114 and 283116 in Dubna using the same reactions. The 50Ti, 58Fe and 64Ni projectiles were chosen since the corresponding projectile-target combinations lead to the synthesis of even heavier elements. The experiments were carried out at the U-400 accelerator of the Flerov Laboratory of Nuclear Reactions (JINR, Russia) and the XTU Tandem accelerator of the National Laboratory of Legnaro (LNL, Italy) using the time-of-flight spectrometer of fission fragments CORSET. The role of the shell effects, the influence of the entrance channel asymmetry and the deformations of colliding nuclei on the mechanism of the fusion-fission and the competitive process of quasi-fission are discussed. The recent results on synthesis of superheavy nuclei and the perspectives of the "hot" fusion reaction for the production of superheavy nuclei are considered.

Published
2006

20. SEARCH FOR TETRANEUTRONS IN THE BREAKUP OF 8HE

Author

M. Labiche, F. Hanappe, N. I. Ashwood, F. M. Marqués, N. M. Clarke, N. Curtis, J. C. Angélique, N. A. Orr, Th. Materna, T. Nilsson, G. Normand, C. N. Timis, Alain Ninane, Pierre Descouvemont, V. Kinnard, E. V. Prokhorova, C. Angulo, Martin Freer, P. McEwan, L. Stuttge, W. N. Catford, M. J. G. Borge, S. D. Pain, and Bouchat Virginie

Subjects
Physics, Nuclear physics, Classical mechanics, Breakup
Published
2005

21. NEUTRON EMISSION IN FISSION AND QUASI-FISSION

Author

S. Beghini, Yu. Ts. Oganessian, E. M. Kozulin, G. N. Knyazheva, I. M. Itkis, M. Trotta, L. Corradi, F. Scarlassara, N. A. Kondratiev, A. Yu. Chizhov, O. Dorvaux, Neil Rowley, G. Giardina, A. M. Stefanini, Francis Hanappe, G. Montagnoli, A. A. Bogatchev, Th. Materna, R. N. Sagaidak, L. Krupa, I. V. Korzyukov, M. G. Itkis, I. V. Pokrovski, J. Kliman, G. Chubarian, Louise Stuttge, V.M. Voskressenski, E. V. Prokhorova, and A. Ya. Rusanov

Subjects
Nuclear physics, Physics, Prompt neutron, Neutron emission, Xenon-135, Neutron, Fission product yield, Long-lived fission product, Delayed neutron, Fast fission
Published
2005

22. SHELL EFFECT MANIFESTATION IN MASS-ENERGY DISTRIBUTIONS OF FISSION AND QUASI-FISSION FRAGMENTS OF NUCLEI WITH Z=102-122

Author

L. Krupa, Marian Jandel, F. Hanappe, Neil Rowley, I. M. Itkis, Yu. Ts. Oganessian, E. M. Kozulin, L. Stuttge, Th. Materna, V. M. Voskresenski, V. Bouchat, E. V. Prokhorova, A. Ya. Rusanov, A. A. Bogachev, I. V. Pokrovsky, G. Giardina, M. G. Itkis, J. Kliman, N. A. Kondratiev, C. Schmitt, G. N. Knyazheva, and O. Dorvaux

Subjects
Physics, Nuclear physics, Nuclear reaction, Mass energy, Spectrometer, Fission, Shell (structure), Atomic physics, Excitation, Entrance channel
Abstract

The mass-energy distributions of the fragments, fusion-fission (OFF) and capture (oCap) cross-sections in the reactions 26Mg+248Cm; 48Ca+2"RPb, 232Th, 238U , 2 4 4 ~ u , 2 4 8 ~ m ; 244Pu, 248Cm were measured at the U400 accelerator of Flerov Laboratory of Nuclear Reactions (JINR, Russia) with use of double-ann time-of-flight spectrometer CORSET. The influence of reaction entrance channel on the competition between fusion-fission and quasi-fission processes was studied. Strong manifestation of the shell effects in mass distributions of fusion-fission and quasi-fission fragments was observed. The multimodal fission phenomena were found for 2 7 4 H ~ and 256N0 nuclei at low excitation energies. % ~ ~ 2 0 8 p b , 232~h

Published
2005

23. Capture and Fusion-Fission Processes in Heavy Ion Induced Reactions

Author

A. A. Bogatchev, V. M. Voskresenski, R. N. Sagaidak, O. Dorvaux, Yu. Ts. Oganessian, I. V. Pokrovsky, V. Bouchat, Marian Jandel, V. A. Rubchenya, A. M. Stefanini, Francis Hanappe, M. Trotta, L. Krupa, I. M. Itkis, N. A. Kondratiev, E. V. Prokhorova, A. Ya. Rusanov, S. Beghini, A. Latina, E. M. Kozulin, Thomas Materna, Wladyslaw Henryk Trzaska, F. Scarlassara, Louise Stuttge, V. G. Lyapin, B. R. Behera, G. Montagnoli, Neil Rowley, G. N. Knyazheva, A. Gadea, M. G. Itkis, C. Schmitt, J. Kliman, E. Fioretto, Suzana Szilner, and L. Corradi

Subjects
Nuclear physics, Nuclear reaction, Isotope, Chemistry, Fission, Radiochemistry, Fusion fission, Neutron, Heavy ion, National laboratory, Entrance channel
Abstract

Results of the experiments aimed at the study of fission and quasi‐fission processes in the reactions 12C+204Pb, 48Ca+144,154Sm, 168Er, 208Pb, 238U, 244Pu, 248Cm; 58Fe+208Pb, 244Pu, 248Cm, and 64Ni+186W, 242Pu are presented. The choice of the above‐mentioned reactions was inspired by the experiments on the production of the isotopes 283112, 289114 and 283116 at Dubna using the same reactions. The 58Fe and 64Ni projectiles were chosen since the corresponding projectile‐target combinations lead to the synthesis of even heavier elements. The experiments were carried out at the U‐400 accelerator of the Flerov Laboratory of Nuclear Reactions (JINR, Russia), the XTU Tandem accelerator of the National Laboratory of Legnaro (LNL, Italy) and the Accelerator of the Laboratory of University of Jyvaskyla (JYFL, Finland) using the time‐of‐flight spectrometer of fission fragments CORSET and the neutron multi‐detector DEMON. The role of shell effects and the influence of the entrance channel asymmetry and the deformatio...

Published
2005

24. TRACKING DISSIPATION IN CAPTURE REACTIONS IN THE SUPERHEAVY REGION

Author

L. Krupa, M. G. Itkis, Yoshihiro Aritomo, I. V. Pokrovski, J. Kliman, A. A. Bogatchev, J. Peter, V. M. Voskresenski, G. Knyajeva, N. Amar, E. M. Kozulin, E. V. Prokhorova, M. Jandel, S. Grévy, V. Bouchat, Thomas Materna, Louise Stuttge, I. M. Itkis, Giorgio Giardina, Francis Hanappe, N. A. Kondratiev, O. Dorvaux, and C. Schmitt

Subjects
Nuclear physics, Physics, Dissipation, Tracking (particle physics)
Published
2004

25. Shell effects in fission and quasi-fission of heavy and superheavy nuclei

Author

L. Krupa, J. A¨ysto¨, G. Montagnoli, Neil Rowley, S. Beghini, R. N. Sagaidak, Yu. Ts. Oganessian, E. M. Kozulin, I. V. Pokrovsky, M. Trotta, V. A. Rubchenya, Th. Materna, N. A. Kondratiev, A. M. Vinodkumar, S. Khlebnikov, G. N. Kniajeva, A. Latina, Valery Zagrebaev, A. M. Stefanini, Giorgio Giardina, F. Hanappe, Marian Jandel, I. M. Itkis, L. Stuttge, A. A. Bogachev, W. H. Trzaska, V.M. Voskressenski, E. V. Prokhorova, A. Ya. Rusanov, O. Dorvaux, A. Gadea, M. G. Itkis, J. Kliman, Suzana Szilner, D. N. Vakhtin, L. Corradi, Fernando Scarlassara, Heyd, Yvette, Institut de Recherches Subatomiques (IReS), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Isotope, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Fission, Shell (structure), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Tandem accelerator, Entrance channel, Nuclear physics, heavy-ion reactions, ion-induced fission, model, Ca-48, Neutron, Atomic physics, National laboratory
Abstract

Results of the experiments aimed at the study of fission and quasi-fission processes in the reactions ^12C+^204Pb, ^48Ca-^144Sm, ^154Sm, ^168Er, ^208Pb, ^238U, ^244Pu, ^248Cm ; ^58Fe+^208Pb, ^244Pu, ^248Cm, and ^64Ni+^186W, ^242Pu are presented in the work. The choice of the above mentioned reactions was inspired by recent experiments on the production of the isotopes (283)112, (289)114 and (283)116 at Dubna [1], [2] using the same reactions. The Fe-58 and ^64Ni projectiles were chosen since the corresponding projectile-target combinations lead to the synthesis of even heavier elements. The experiments were carried out at the ^400U accelerator of the Flerov Laboratory of Nuclear Reactions (JINR, Russia), the XTU Tandem accelerator of the National Laboratory of Legnaro (LNL, Italy) and the Accelerator of the Laboratory of University of Jyvaskyla (JYFL, Finland) using the time-of-flight spectrometer of fission fragments CORSET[3] and the neutron multi-detector DEMON[4], [5]. The role of shell effects and the influence of the entrance channel on the mechanism of the compound nucleus fusion-fission and the competitive process of quasi-fission are discussed.

Published
2004

26. Shell effects in Fusion-Fission of heavy and superheavy nuclei

Author

M. Trotta, N. A. Kondratiev, V.M. Voskressenski, Marian Jandel, E. V. Prokhorova, Giorgio Giardina, A. Ya. Rusanov, A. M. Stefanini, Neil Rowley, L. Krupa, I. M. Itkis, S. Beghini, E. M. Kozulin, L. Latina, G. N. Kniajeva, A. A. Bogatchev, Thomas Materna, Fernando Scarlassara, O. Dorvaux, Yu. Ts. Oganessian, I. V. Pokrovsky, L. Corradi, Louise Stuttge, Francis Hanappe, Suzana Szilner, I. V. Korzyukov, A. Gadea, M. G. Itkis, J. Kliman, G. Montagnoli, and Jolos, Rostislav and Scheid, Werner

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Cold fission, fusion, fission, quasi-fission, shell, mass and energy distribution, heavy and superheavy nuclei, reaction, compound nucleus, Cluster decay, Fission, Nuclear Theory, Hadron, General Physics and Astronomy, Coulomb barrier, Fission product yield, Nuclear physics, mass and energy distributions, Neutron, Atomic physics, Nuclear Experiment
Abstract

The process of fusion-fission of heavy and superheavy nuclei (SHE) with Z = 82-122 formed in the reactions with ^48Ca and ^58Fe ions at energies near and below the Coulomb barrier has been studied. The experiments were carried out at the ^400U accelerator of the Flerov Laboratory of Nuclear Reactions (JINR) and at the XTU Tandem accelerator of the National Laboratory of Legnaro, (LNL) using the time-of-flight spectrometer of fission fragments CORSET and the neutron multi-detector DEMON. As a result of the experiments, mass and energy distributions (MED) of fission fragments, fission, quasi-fission and evaporation residues cross sections, multiplicities of neutrons and gamma quanta and their dependence on the mechanism of formation and decay of compound systems have been studied.

Published
2004

27. Energy balance in fission and quasifission of 256No

Author

Marian Jandel, Thomas Materna, E. M. Kozulin, Louise Stuttge, I. M. Itkis, V.M. Voskressenski, E. V. Prokhorova, D.M. Gorodisskiy, A. A. Bogachev, B. Benoit, N. A. Kondratiev, Ya Rusanov, Francis Hanappe, M. G. Itkis, J. Kliman, Yu. Ts. Oganessian, I. V. Pokrovsky, L. Krupa, Heyd, Yvette, Institut de Recherches Subatomiques (IReS), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Fission, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Energy balance, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2004

28. COMPETITION BETWEEN FUSION-FISSION AND QUASIFISSION IN HEAVY-ION REACTIONS LEADING TO SUPERHEAVY ELEMENTS

Author

F. Hanappe, L. Krupa, Marian Jandel, Yu. Ts. Oganessian, E. M. Kozulin, Neil Rowley, V. A. Ponomarenko, L. Stuttge, I. M. Itkis, V. M. Voskresenski, E. V. Prokhorova, I. V. Pokrovsky, G. N. Kniajeva, A. Ya. Rusanov, N. A. Kondratiev, Th. Materna, M. G. Itkis, J. Kliman, I. V. Korzyukov, A. A. Bogatchev, and G. Giardina

Subjects
Nuclear physics, Nuclear reaction, Physics, Center (algebra and category theory), Heavy ion, Fusion fission, Superheavy Elements
Abstract

Flerov Laboratory of Nuclear Reactions, JINR, 141980 Dubna, Russia I Universite Libre de Bruxelles, Bruxelles, Belgique 21nstitut de Recherches Subatomiques, CNRS-IN2P3, Strasbourg, France 'Department of Physics, University of Messina and INFN, Italy "Institute of Nuclear Physics of the National Nuclear Center of Kazakhstan 480082 Almaty, Kazakhstan 'Institute of Physics SASc, 84228 Bratislava, Slovakia

Published
2003

29. Tracking dissipation in capture reactions

Author

E. V. Prokhorova, Francis Hanappe, O. Dorvaux, A. A. Bogatchev, Thomas Materna, V. Bouchat, Yoshihiro Aritomo, V. Kinnard, K. Siwek-Wilczyńska, Masahisa Ohta, Ch. Schmitt, Louise Stuttge, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Heyd, Yvette

Subjects
Physics, Nuclear and High Energy Physics, Fission, Chemistry, Stochastic process, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Theory, chemistry.chemical_element, General Physics and Astronomy, Dissipation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Neutron multiplicity, Tracking (particle physics), Nuclear physics, Classical mechanics, 25.70.Jj, 27.90.+b, 27.80.+w, Neutron, Nobelium, Statistical physics, Multiplicity (chemistry), Nuclear Experiment, Mixing (physics), Energy (signal processing), Excitation
Abstract

Nuclear dissipation in capture reactions is investigated using backtracing. Combining the analysis procedure with dynamical models, the difficult and long-standing problem of competition and mixing of quasi-fission and fusion-fission is solved for the first time. At low excitation energy a new protocol able to handle low statistics data gives access to the prescission neutron multiplicity in two different systems 48 Ca +208 Pb, Pu . The results are in agreement with a domination of fusion-fission in the case of 256 No and an equal mixing of quasi-fission and fusion-fission in the case of Z=114. The nature of the relevant dissipation is determined as one-body dissipation.

Published
2003

30. SHELL EFFECTS IN FUSION-FISSION OF HEAVY AND SUPERHEAVY NUCLEI

Author

I. V. Korzyukov, Yu. Ts. Oganessian, I. V. Pokrovsky, L. Krupa, A. A. Bogatchev, V. A. Rubchenya, A. A. Goverdovski, L. Corradi, G. Giardina, O. Dorvaux, D. N. Vakhtin, A. M. Stefanini, A. Gadea, M. G. Itkis, Suzana Szilner, Marian Jandel, Louise Stuttge, J. Kliman, I. M. Itkis, S. Khlebnikov, G. Montagnoli, F. Scarlassara, M. Trotta, N. A. Kondratiev, G. N. Kniajeva, A. M. Vinodkumar, Francis Hanappe, Thomas Materna, Neil Rowley, J. Äystö, V. M. Voskresenski, W. H. Trzaska, L. Latina, S. Beghini, E. M. Kozulin, E. V. Prokhorova, A. Ya. Rusanov, and Valery Zagrebaev

Subjects
Nuclear physics, Physics, Shell (structure), Fusion fission
Published
2003

31. FISSION AND QUASI-FISSION OF NUCLEI PRODUCED IN THE REACTIONS WITH 48CA IONS

Author

Th. Materna, R. N. Sagaidak, S. Beghini, Yu. Ts. Oganessian, E. M. Kozulin, A. A. Bogatchev, A. M. Stefanini, V. Kumar, I. M. Itkis, G. Chubarian, A. Yu. Chizhov, M. G. Itkis, F. Hanappe, M. Trotta, I. V. Pokrovski, G. N. Knyazheva, J. Kliman, G. Montagnoli, N. A. Kondratiev, G. Giardina, I. V. Korzyukov, L. Corradi, F. Scarlassara, V.M. Voskressenski, E. V. Prokhorova, A. Ya. Rusanov, L. Stuttge, L. Krupa, and Neil Rowley

Subjects
Materials science, Fission, Radiochemistry, Fission product yield, Atomic physics
Published
2003

32. Fusion-fission of heavy and superheavy nuclei

Author

M. G. Itkis, S. Beghini, E. M. Kozulin, A. M. Stefanini, Giorgio Giardina, M. Trotta, G. Montagnoli, G. N. Kniajeva, I. V. Korzyukov, Thomas Materna, V. M. Voskressensky, Francis Hanappe, L. Latina, A. M. Vinodkumar, A. A. Goverdovski, M. Jandel, S. Szilner, Louise Stuttge, Neil Rowley, O. Dorvaux, Kenton J. Moody, I. M. Itkis, L. Krupa, E. V. Prokhorova, N. A. Kondratiev, A. Ya. Rusanov, A. A. Bogatchev, Fernando Scarlassara, V. A. Ponomarenko, L. Corradi, J. Kliman, A. Gadea, Yu. Ts. Oganessian, and I. V. Pokrovsky

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Spectrometer, Fission, Nuclear Theory, Coulomb barrier, Fusion fission, fusion-fision, heavy and superheavy nuclei, Tandem accelerator, Atomic and Molecular Physics, and Optics, Ion, Nuclear physics, Neutron, Atomic physics, Nuclear Experiment
Abstract

The process of fusion-fission of heavy and superheavy nuclei (SHE) with Z = 82-122 formed in the reactions with Ca-48 and Fe-58 ions at energies near and below the Coulomb barrier has been studied. The experiments were carried out at the U-400 accelerator of the Flerov Laboratory of Nuclear Reactions (JINR) and at the XTU Tandem accelerator of the National Laboratory of Legnaro (LNL) using the time-of-flight spectrometer of fission fragments CORSET and the neutron multidetector DEMON. As a result of the experiments, mass and energy distributions (MED) of fission fragments ; fission, quasifission, and evaporation residue cross sections ; and multiplicities of neutrons and gamma-quanta and their dependences on the mechanism of formation and decay of compound systems have been studied.

Published
2003

33. GAMMA RAY EMISSION IN FISSION AND QUASIFISSION OF HEAVY AND SUPERHEAVY ELEMENTS

Author

I. V. Korzyukov, L. Krupa, A. A. Bogatchev, E. V. Prokhorova, Neil Rowley, A. Ya. Rusanov, V. M. Voskresenski, F. Hanappe, N. A. Kondratiev, G. Giardina, M. G. Itkis, Marian Jandel, J. Kliman, I. M. Itkis, G. N. Kniajeva, Yu. Ts. Oganessian, E. M. Kozulin, V. A. Ponomarenko, I. V. Pokrovsky, L. Stuttge, and Th. Materna

Subjects
Physics, Nuclear physics, Fission, Gamma ray, Superheavy Elements
Published
2002

34. FUSION-FISSION AND QUASIFISSION OF SUPERHEAVY NUCLEI PRODUCED IN REACTIONS WITH 58<font>Fe</font> IONS

Author

M. G. Itkis, I. V. Pokrovski, J. Kliman, Yu. Ts. Oganessian, E. M. Kozulin, V. A. Ponomarenko, G. Giardina, E. V. Prokhorova, V. M. Voskresenski, Marian Jandel, A. A. Bogatchev, C. Schmitt, A. Ya. Rusanov, I. M. Itkis, G. N. Kniajeva, Neil Rowley, I. V. Korzyukov, F. Hanappe, Th. Materna, L. Stuttge, N. A. Kondratiev, and L. Krupa

Subjects
Physics, Nuclear physics, Fusion fission
Published
2002

35. PRODUCTION AND DECAY OF SUPERHEAVY ELEMENTS

Author

I. V. Korzyukov, Marian Jandel, K. J. Moody, I. M. Itkis, Yu. Ts. Oganessian, E. M. Kozulin, V. A. Ponomarenko, M. G. Itkis, I. V. Pokrovski, J. Kliman, G. N. Kniajeva, A. A. Goverdovski, E. V. Prokhorova, V. M. Voskresenski, A. Ya. Rusanov, G. Giardina, Th. Materna, N. Amar, Neil Rowley, B. Benoit, A. A. Bogatchev, L. Krupa, C. Schmitt, L. Stuttge, F. Hanappe, G. Chubarian, N. A. Kondratiev, J. Peter, and V. S. Salamatin

Subjects
Physics, Nuclear physics, Superheavy Elements
Published
2002

36. FISSION OF Ra ISOTOPES PRODUCED IN 12<font>C</font> + 204,206,208<font>Pb</font> REACTIONS

Author

Neil Rowley, A. V. Yeremin, C. Maiolino, S. Beghini, Ch. Schmitt, I. M. Itkis, A. M. Vinodkumar, Yu. Ts. Oganessian, E. M. Kozulin, F. Hanappe, L. Corradi, P. Desesquelles, A. M. Stefanini, F. Scarlassara, M. Trotta, Luciano Calabretta, G. Montagnoli, R. N. Sagaidak, N. A. Kondratiev, M. G. Itkis, I. V. Pokrovski, G.F. Segato, O. Dorvaux, L. Stuttge, V.M. Voskressenski, E. V. Prokhorova, and A. Ya. Rusanov

Subjects
Isotope, Chemistry, Fission, Isotopes of samarium, Radiochemistry
Published
2002

37. Nuclear fission at border lines

Author

A. A. Bogatchev, N. A. Kondratiev, L. Krupa, M. G. Itkis, I. V. Pokrovski, K. J. Moody, G. N. Kniajeva, Neil Rowley, J. Kliman, G. Giardina, E. V. Prokhorova, A. Ya. Rusanov, Th. Materna, I. V. Korzyukov, Marian Jandel, V. M. Voskresenski, F. Hanappe, Yu. Ts. Oganessian, E. M. Kozulin, I. M. Itkis, V. A. Ponomarenko, L. Stuttge, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Heyd, Yvette

Subjects
Nuclear physics, Physics, Nuclear fission, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear engineering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2002

38. FISSION OF SUPERHEAVY NUCLEI

Author

Neil Rowley, C. Schmitt, L. Krupa, A. A. Bogatchev, Th. Materna, K. J. Moody, Yu. Ts. Oganessian, E. M. Kozulin, V. A. Ponomarenko, E. V. Prokhorova, G. Giardina, A. Ya. Rusanov, I. V. Korzyukov, L. Stuttge, N. A. Kondratiev, F. Hanappe, V. M. Voskresenski, A. A. Goverdovski, M. G. Itkis, I. V. Pokrovski, J. Kliman, Marian Jandel, I. M. Itkis, and G. N. Kniajeva

Subjects
Nuclear physics, Physics, Fission
Published
2002

39. MASS-ENERGY DISTRIBUTIONS OF FISSION FRAGMENTS OF SUPERHEAVY NUCLEI PRODUCED IN THE REACTIONS WITH 48<font>CA</font> IONS

Author

Neil Rowley, E. V. Prokhorova, A. Ya. Rusanov, Marian Jandel, Yu. Ts. Oganessian, E. M. Kozulin, V. A. Ponomarenko, I. M. Itkis, A. A. Bogatchev, V. M. Voskresenski, G. N. Kniajeva, Th. Materna, N. A. Kondratiev, F. Hanappe, M. G. Itkis, I. V. Pokrovski, L. Krupa, J. Kliman, G. Giardina, B. Benoit, L. Stuttge, and I. V. Korzyukov

Subjects
Mass energy, Fission, Chemistry, Radiochemistry
Published
2002

40. THE STUDY OF THE CHARACTERISTICS OF NEUTRON EMISSION IN THE REACTIONS WITH 48<font>CA</font> IONS

Author

A. A. Bogatchev, N. Amar, Neil Rowley, Jean Péter, V.M. Voskressenski, E. V. Prokhorova, Ch. Schmitt, G. Giardina, G. N. Knyazheva, I. M. Itkis, I. V. Korzyukov, O. Dorvaux, N. A. Kondratiev, L. Stuttge, M. G. Itkis, I. V. Pokrovski, J. Kliman, Th. Materna, F. Hanappe, Yu. Ts. Oganessian, E. M. Kozulin, P. Desesquelles, and L. Krupa

Subjects
Materials science, 010308 nuclear & particles physics, Neutron emission, 0103 physical sciences, Radiochemistry, 010306 general physics, 01 natural sciences
Published
2002

41. THE STUDY OF THE REACTION 58<font>Fe</font> + 248<font>Cm</font> → 306122

Author

K. J. Moody, Neil Rowley, F. Hanappe, I. V. Korzyukov, L. Krupa, Th. Materna, Marian Jandel, G. Knyajeva, V. M. Voskresenski, B. Benoit, I. M. Itkis, M. G. Itkis, I. V. Pokrovski, J. Kliman, Yu. Ts. Oganessian, E. M. Kozulin, E. V. Prokhorova, V. A. Ponomarenko, A. A. Bogatchev, A. Ya. Rusanov, L. Stuttge, G. Giardina, and N. A. Kondratiev

Subjects
Physics
Published
2002

42. INVESTIGATION OF NEUTRON AND GAMMA MULTIPLICITIES IN REACTIONS WITH HEAVY IONS LEADING TO THE PRODUCTION OF SUPERHEAVY NUCLEI CLOSE TO THE ISLAND OF STABILITY

Author

Marian Jandel, M. G. Itkis, I. V. Pokrovski, F. Hanappe, I. M. Itkis, Ch. Stodel, J. Kliman, G. N. Kniajeva, A. Yu. Chizhov, V. M. Voskresenski, I. V. Korzyukov, Alain Ninane, B. J. P. Gall, Z. Radivojevic, W. H. Trzaska, G. Giardina, P. Desesquelles, A. A. Bogatchev, J. M. Gauthier, O. Dorvaux, L. Krupa, Th. Materna, G. Chubarian, St. Grevy, Jean Péter, N. Amar, Neil Rowley, V. A. Rubchenya, Yu. Ts. Oganessian, E. M. Kozulin, V. A. Ponomarenko, Ch. Schmitt, E. V. Prokhorova, L. Stuttge, N. A. Kondratiev, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-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)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), 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), Fazio G.Giardina G.Hanappe F.Imme G.Rowley N., Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Guesnon, Sandrine

Subjects
Nuclear physics, Physics, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], 010308 nuclear & particles physics, 0103 physical sciences, Neutron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Atomic physics, 010306 general physics, 01 natural sciences, Island of stability, Ion
Published
2002

44. Fission modes in the reaction208Pb(18O,f)

Author

K. Lukashin, S.V. Zhdanov, Luciano Calabretta, N. A. Kondratiev, G. Bellia, V. S. Salamatin, Ya Rusanov, J.M. Itkis, Francis Hanappe, C. Agodi, A. Kelic, V. V. Pashkevich, G. Rudolf, S.I. Mul'gin, I. V. Pokrovsky, B. Hurst, G. G. Chubarian, E. M. Kozulin, R.P. Schmitt, Louise Stuttge, M. G. Itkis, E. V. Prokhorova, and Concettina Maiolino

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Fission, 01 natural sciences, 7. Clean energy, Ion, 0103 physical sciences, Nuclear fusion, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Energy (signal processing)
Abstract

Results of fission fragment mass-energy distributions of the compound ${}^{226}\mathrm{Th}$ nucleus formed in the sub-barrier fusion reaction ${}^{18}\mathrm{O}{+}^{208}\mathrm{Pb}$ at an energy of ${}^{18}\mathrm{O}$ ions ${E}_{\mathrm{lab}}=78$ MeV are reported. The reaction has been studied twice using two different accelerators, and both sets of experimental data agree quite well. Performed analysis of the experimental data with the use of a new multicomponent method has shown that alongside the well-known modes, i.e., the symmetric (S) and two asymmetric modes standard-one and standard-two, a high-energy mode standard-three has manifested itself. The last named mode appears due to the influence of the close-to-sphere neutron shell with $N\ensuremath{\approx}50$ in the light fission fragment group. Theoretical calculations of the prescission shapes of the fissioning nuclei ${}^{224,226}\mathrm{Th}$ confirm this conclusion.

Published
2000

45. Fusion-fission of superheavy nuclei at low excitation energies

Author

G. N. Kniajeva, Yu. Ts. Oganessian, E. M. Kozulin, V. A. Ponomarenko, Th. Materna, V. M. Voskresenski, Neil Rowley, N. A. Kondratiev, Marian Jandel, A. A. Bogatchev, K. J. Moody, M. G. Itkis, I. V. Pokrovski, J. Kliman, I. M. Itkis, F. Hanappe, G. Giardina, I. V. Korzyukov, L. Krupa, B. Benoit, E. V. Prokhorova, A. Ya. Rusanov, L. Stuttge, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Heyd, Yvette

Subjects
Nuclear physics, Physics, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Fusion fission, Atomic physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Excitation
Published
2000

46. Three fission modes of220Ra

Author

M. G. Itkis, I. V. Pokrovsky, E. V. Prokhorova, A. Ya. Rusanov, S. P. Tretyakova, N. A. Kondratiev, C. Maiolino, Luciano Calabretta, and E. M. Kozulin

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Range (particle radiation), Fission, Coulomb barrier, Atomic physics, Nuclear Experiment, Kinetic energy
Abstract

Mass-energy distributions of the ${}^{220}\mathrm{Ra}$ fission fragments produced in the ${}^{12}\mathrm{C}{+}^{208}\mathrm{Pb}$ reaction at projectile energies higher and deep below the Coulomb barrier have been measured using a two-arm time-of-flight spectrometer CORSET. It has been shown that an asymmetric component appears at the sides of the prevailing symmetric fission with a cooling of the compound nucleus. The component consists of two standard modes with average masses of $\ensuremath{\simeq}132$ and $\ensuremath{\simeq}139.$ A three-component structure has also been observed in the total kinetic energy distributions in the range of asymmetric fission fragment masses.

Published
1999

47. Low energy fission of [sup 256]No, [sup 270]Sg, [sup 271]Hs and [sup 286]112 nuclei formed in reactions with [sup 22]Ne and [sup 48]Ca ions

Author

N. A. Kondratiev, Yu. Ts. Oganessian, E. M. Kozulin, M. G. Itkis, E. V. Prokhorova, A. Ya. Rusanov, L. Krupa, and I. V. Pokrovsky

Subjects
Physics, Fission products, Low energy, chemistry, Fission, Mass spectrum, Analytical chemistry, chemistry.chemical_element, Nobelium, Kinetic energy
Abstract

The fusion-fission reactions {sup 22}Ne + {sup 248}Cm and {sup 22}Ne + {sup 249}Cf were investigated at projectile energies equal to 102 and 127 MeV. Mass-energy distributions and yields are shown. Two-dimensional plots of TKE vs fragment mass are also shown for {sup 48}Ca reactions at 230 MeV with {sup 208}Pb and {sup 238}U, leading to {sup 256}No and {sup 286}112.

Published
1999

48. Prefission neutron multiplicities and the fission modes of Th-226

Author

Louise Stuttge, L. Donadille, M. G. Itkis, A. Huck, D. Vorkapic, B. Heusch, E. M. Kozulin, G. Guillaume, K. Yuasa-Nakagawa, E. de Goes Brennand, Yu. Ts. Oganessian, I. V. Pokrovsky, G. Rudolf, B. Benoit, N. A. Kondratiev, O. Dorvaux, S. Jokic, G.J. Costa, E. V. Prokhorova, A. Ya. Rusanov, Francis Hanappe, I. M. Itkis, and A. Kelic

Subjects
Physics, 010308 nuclear & particles physics, Fission, Nuclear Theory, General Physics and Astronomy, Neutron spectra, 01 natural sciences, 7. Clean energy, Coincidence, Nuclear physics, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Nuclear Experiment
Abstract

The neutron spectra associated to the two fission modes of Th-226 have been measured in coincidence with the fragment yields of the O-18 + Pb-208 reaction at E-lab = 78 MeV. The pre- and post-fission multiplicities and temperatures have been extracted. Surprisingly, the prefission neutron multiplicities associated with the asymmetric mode are larger than those associated with the symmetric mode.

Published
1999

49. Fission of nuclei with

Author

M. G. Itkis, Yu. Ts. Oganessian, E. M. Kozulin, V. A. Ponomarenko, I. V. Pokrovsky, V. I. Vakatov, N. A. Kondratiev, L. Krupa, A. N. Polyakov, B.I. Pustyl'nik, E. V. Prokhorova, and A. Ya. Rusanov

Subjects
Nuclear reaction, Nuclear physics, Cold fission, Fission products, Cluster decay, Chemistry, Fission, Radiochemistry, Coulomb barrier, Fission product yield, Spontaneous fission
Abstract

The talk presents new results obtained in the study of fission of superheavy nuclei 256No, 270Sg and 286112 formed in reactions with 22Ne and 48Ca ions at energies near or considerably lower than the Coulomb barrier. The experiments have been performed at the U-400 accelerator of the Flerov Laboratory of Nuclear Reactions (FLNR) with the use of the time-of-flight spectrometer of fission fragments CORSET.

Published
1998

50. [Morphofunctional aspects of genetic analysis of osteogenesis imperfecta in cultured skin fibroblasts]

Author

E M, Meerson, F S, Barer, A P, Berezhnyĭ, E V, Prokhorova, T P, Maliavko, E V, Chernysheva, and E P, Neustroeva

Subjects
Adult, Cytoplasm, Adolescent, Infant, Fibroblasts, Middle Aged, Osteogenesis Imperfecta, Fibronectins, Phenotype, Child, Preschool, Humans, Collagen, Child, Cells, Cultured, Skin
Abstract

Osteogenesis imperfecta (OI) is a disease with biochemical evidence of abnormality in collagen biosynthesis. We report here that expression of the OI phenotype extends to the level of dermal fibroblast morphology in vitro. Growth characteristics and morphology of control (n = 3) and 01 cell strains (n = 10) were compared. Our results show that (1) OI fibroblasts take longer time (16 days) than that with control cells (13 days) to reach stationary phase; (2) OI fibroblasts achieve a lower cell density (1.0 +/- 0.09) at stationary phase compared to control cells (1.47 +/- 0.1); p0.01; (3) cell shape (expressed as the width/length ratio) was also abnormal in OI cells: they have significantly increased ratios (p0.05) compared to control. These changes were associated with an increased level of fibronectin concentration and engorged cytoplasmic vesicles in dermal fibroblasts in vitro. We have reason to suspect that dysmorphology of fibroblasts may be related to aberrant collagen metabolism that leads to inadequacy of extracellular substratum, that in its turn hinders normal adhesion of cells as well as their spreading, morphology and fibronectin concentration.

Published
1992

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