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1. Angular correlations in the prompt neutron emission of spontaneous fission of 252Cf

Author

E. V. Chernysheva, Zh. V. Mezentseva, Yu. N. Kopatch, Manfred Mutterer, Friedrich Gönnenwein, I. S. Guseva, S.A. Telezhnikov, A. M. Gagarski, F. Hanappe, F.-J. Hambsch, A. Chietera, Louise Stuttge, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-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
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Fission, Neutron emission, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, Prompt neutron, 0103 physical sciences, Neutron detection, Nuclear fusion, Neutron, Nuclear Experiment, 010306 general physics, Anisotropy, Spontaneous fission
Abstract

Neutron angular distributions in spontaneous fission of 252Cf are investigated. The CORA experiment, performed at IPHC Strasbourg, aims at elucidating neutron emission mechanisms in the fission process. The experimental setup is composed of the angle-sensitive twin ionisation chamber CODIS for the detection of fission fragments and the DEMON neutron detector assembly. The development of a simulation toolkit based on GEANT4 and MENATE_R is described, adapted as a strategy to investigate the influence of experimental conditions on the observed properties of neutrons emitted. Besides the kinematic neutron anisotropy in the laboratory system due to neutron evaporation from moving fragments, two additional effects are discussed which may have an influence on the angular distributions of neutrons: scission neutrons and dynamic neutron emission anisotropy in the CM system of fragments due to the spin carried by fragments. A new analysis method is presented to disentangle the dynamic anisotropy from the other effects in an independent way. For the dynamic anisotropy only an upper limit could be found. Results for the angular correlation $ (\mathrm{n},\mathrm{n})$ between two evaporated neutrons and the correlation $ (\mathrm{n},\mathrm{LF})$ between an evaporated neutron and the Light Fragment direction of flight are reported.

Published
2018
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3. DEVELOPMENT OF A TECHNIQUE FOR MEASURING NEUTRONS SPECTRA DURING IRRADIATION OF THICK URANIUM TARGETS BY PROTONS (660 MeV)

Author

I. P. Yudin, I. N. Dyatlov, S. A. Gustov, A. A. Solnyshkin, K. K. Limarev, E. M. Kozulin, A. I. Berlev, V. Y. Shchegolev, E. O. Saveljeva, K. V. Novikov, A. N. Baranov, Sergey I. Tyutyunnikov, F. Hanappe, and I. V. Vorobyev

Subjects
Nuclear physics, Materials science, chemistry, Radiochemistry, chemistry.chemical_element, Neutron, Irradiation, Uranium, Spectral line
Published
2017
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4. Challenging fission dynamics around the barrier: The case of $^{34}$S + $^{186}$W

Author

F. Hanappe, S. Calinescu, A. Gottardo, F. Azaiez, I. M. Harca, K. V. Novikov, E. M. Kozulin, I. M. Itkis, O. Dorvaux, Wladyslaw Henryk Trzaska, D. Verney, T. Loktev, Emanuele Vardaci, J. Piot, G. N. Knyazheva, C. Schmitt, I. Matea, A. A. Bogachev, C. Borcea, G. G. Chubarian, S. N. Dmitriev, C. Petrone, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Kozulin, E. M., Vardaci, Emanuele, Harca, I. M., Schmitt, C., Itkis, I., Knyazheva, G., Novikov, K., Bogachev, A., Dmitriev, S., Loktev, T., Azaiez, F., Matea, I., Verney, D., Gottardo, A., Dorvaux, O., Piot, J., Chubarian, G., Trzaska, W. H., Hanappe, F., Borcea, C., Calinescu, S., and Petrone, C.

Subjects
Physics, Nuclear and High Energy Physics, Field (physics), 010308 nuclear & particles physics, Fission, Hadron, Coulomb barrier, Observable, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Collision, Kinetic energy, 01 natural sciences, Nuclear physics, 0103 physical sciences, Nuclear fusion, Nuclear Experiment, 010306 general physics
Abstract

The current status of fission dynamics studies in heavy-ion collisions around the Coulomb barrier is illustrated with the 34S + 186W reaction. The fission-fragment mass and total kinetic energy were measured at the ALTO facility at IPN Orsay, France, with a dedicated set-up using the (v, E) approach. The measurement reveals the presence of an asymmetric fission component on top of a predominantly symmetric distribution. The asymmetric structure, pointed out for the first time, is discussed along with results of previous experiments studying the same reaction. While these analyses suggested the contribution from either quasi-fission or pre-equilibrium fission, we offer an alternative interpretation, in terms of shell-driven compound-nucleus fission. The present measurement demonstrates the critical influence of resolution when addressing puzzling cases, situated at the crossroads of the various channels opened in a heavy-ion collision. Current status in the field clearly calls for innovative measurements involving manifold correlations and new observables. The outcome of the attempt done in this work in this direction, based on the coincident measurement of prompt \( \gamma\)-rays is reported, and encouraging perspectives are discussed.

Published
2016
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5. The 8He and 10He spectra studied in the (t,p) reaction

Author

Dan-Yang Pang, Alain Ninane, E. Yu. Nikolskii, W. Mittig, S. A. Krupko, B. G. Novatskii, S. K. Grishechkin, V. A. Gorshkov, R. S. Slepnev, A. A. Yukhimchuk, Yu. I. Vinogradov, A.A. Korsheninnikov, D. N. Stepanov, L. Stuttge, S. V. Zlatoustovskiy, V. V. Perevozchikov, E. A. Kuzmin, A. M. Rodin, G.M. Ter-Akopian, A. S. Fomichev, Yu. Ts. Oganessian, S. V. Stepantsov, F. Hanappe, S. I. Sidorchuk, M. S. Golovkov, V. Chudoba, R. Wolski, P. Roussel-Chomaz, and L. V. Grigorenko

Subjects
Physics, Nuclear and High Energy Physics, education.field_of_study, 010308 nuclear & particles physics, Population, 01 natural sciences, Spectral line, Dipole, Excited state, 0103 physical sciences, Peak value, Atomic physics, Basso continuo, 010306 general physics, Ground state, education, Excitation
Abstract

The low-lying spectra of 8He and 10He nuclei were studied in the 3H(6He, p)8He and 3H(8He, p)10He transfer reactions. The 0+ ground state (g.s.) of 8He and excited states, 2+ at 3.6–3.9 MeV and (1+) at 5.3–5.5 MeV, were populated with cross sections of 200, 100–250, and 90–125 μb/sr, respectively. Some evidence for a 8He state at about 7.5 MeV was obtained. We discuss a possible nature of the nearthreshold anomaly above 2.14 MeV in 8He and relate it to the population of a 1− continuum (soft dipole excitation) with a peak value at about 3 MeV. The lowest energy group of events in the 10He spectrum was observed at ∼ 3 MeV with a cross section of ∼ 140 μb/sr. We argue that this result is consistent with the previously reported observation of 10He providing the new 10He g.s. position at about 3 MeV

Published
2009
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6. B(E1) strengths from Coulomb excitation of 11Be

Author

V. A. Ziman, Louise Stuttge, Alain Ninane, G. Normand, Steven Pain, Martin Freer, D. Mahboub, W. N. Catford, Roy Crawford Lemmon, N. M. Clarke, V. Bouchat, C. N. Timis, J.S. Winfield, J.L. Lecouey, N. I. Ashwood, F. Hanappe, N. A. Orr, M. Labiche, N. Curtis, B. R. Fulton, J. C. Angélique, N.C. Summers, Neven Soić, Ian J. Thompson, and Filomena Nunes

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Projectile, Electric potential energy, Coulomb excitation, 01 natural sciences, Reaction model, 0103 physical sciences, Atomic physics, Basso continuo, 010306 general physics, Nucleon, Quantum, Excitation
Abstract

The B(E1;1/2{sup +}{yields} 1/2{sup -}) strength for {sup 11}Be has been extracted from intermediate energy Coulomb excitation measurements, over a range of beam energies using a new reaction model, the extended continuum discretized coupled channels (XCDCC) method. In addition, a measurement of the excitation cross section for {sup 11}Be+{sup 208}Pb at 38.6 MeV/nucleon is reported. The B(E1) strength of 0.105(12) e{sup 2}fm{sup 2} derived from this measurement is consistent with those made previously at 60 and 64 MeV/nucleon, in contrast to an anomalously low result obtained at 43 MeV/nucleon. By coupling a multi-configuration description of the projectile structure with realistic reaction theory, the XCDCC model provides for the first time a fully quantum mechanical description of Coulomb excitation. The XCDCC calculations reveal that the excitation process involves significant contributions from nuclear, continuum, and higher-order effects. An analysis of the present and two earlier intermediate energy measurements yields a combined B(E1) strength of 0.105(7) e{sup 2}fm{sup 2}. This value is in good agreement with the value deduced independently from the lifetime of the 1/2{sup -} state in {sup 11}Be, and has a comparable precision.

Published
2007
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7. Pre-scission neutron multiplicity associated with the dynamical process in the superheavy-mass region

Author

Masahisa Ohta, Yoshihiro Aritomo, and F. Hanappe

Subjects
Physics, Nuclear and High Energy Physics, Nuclear Theory, Basis (linear algebra), Neutron emission, FOS: Physical sciences, Space (mathematics), Nuclear Theory (nucl-th), Nuclear physics, medicine.anatomical_structure, Distribution (mathematics), Scientific method, medicine, Deformation (engineering), Nuclear Experiment, Nucleus, Bond cleavage
Abstract

The fusion-fission process accompanied by neutron emission is studied in the superheavy-mass region on the basis of the fluctuation-dissipation model combined with a statistical model. The calculation of the trajectory or the shape evolution in the deformation space of the nucleus with neutron emission is performed. Each process (quasi-fission, fusion-fission, and deep quasi-fission processes) has a characteristic travelling time from the point of contact of colliding nuclei to the scission point. These dynamical aspects of the whole process are discussed in terms of the pre-scission neutron multiplicity, which depends on the time spent on each process. We have presented the details of the characteristics of our model calculation in the reactions $^{48}$Ca+$^{208}$Pb and $^{48}$Ca+$^{244}$Pu, and shown how the structure of the distribution of pre-scission neutron multiplicity depends on the incident energy., 19 pages, 12 figures, Accepted for publication in J. Phys. G

Published
2006
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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
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9. Dynamics of fusion-fission process with neutron evaporation in superheavy mass region

Author

Yoshihiro Aritomo, F. Hanappe, Masahisa Ohta, L. Stuttge, Th. Materna, 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 and High Energy Physics, Fusion, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Fission, Neutron emission, Nuclear Theory, Evaporation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Kinetic energy, Nuclear physics, Cross section (physics), Scientific method, Neutron, Atomic physics, Nuclear Experiment
Abstract

The fusion-fission process for the synthesis of superheavy elements is discussed on the basis of fluctuation-dissipation dynamics. Recently, experiments at Dubna on fission of superheavy nuclei were carried out, and the mass and total kinetic energy distributions of fission fragments were measured. The fusion-fission cross section was derived from the experiments. We analyze the data using a three-dimensional Langevin calculation. We present a clear understanding of the competition between the fusion and the quasifission. We emphasize that a one-or two-dimensional model of Langevin calculation is not sufficient to estimate the fusion cross section in the superheavy mass region. Also, experiments on the emission of neutrons in correlation with fission fragments were conducted. It is useful to investigate the fusion-fission dynamics. We take into account the neutron emission with a Langevin calculation and compare it with experimental data. Finally, we discuss the evaporation residue cross section for superheavy elements.

Published
2004
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10. Resonance states of hydrogen nuclei 4H and 5H obtained in transfer reactions with exotic beams

Author

Isao Tanihata, S. V. Stepantsov, V. A. Gorshkov, L. Stuttge, Th. Materna, Alain Ninane, Yu. Ts. Oganessian, A. A. Korsheninnikov, D. D. Bogdanov, M. S. Golovkov, S. I. Sidorchuk, M. L. Chelnokov, F. Hanappe, R. Wolski, G.M. Ter-Akopian, A. M. Rodin, A. S. Fomichev, R. S. Slepnev, and E. Yu. Nikolski

Subjects
Physics, Nuclear and High Energy Physics, Mass energy, Hydrogen, Resolution (electron density), chemistry.chemical_element, Atomic and Molecular Physics, and Optics, Coincidence, Spectral line, medicine.anatomical_structure, chemistry, medicine, Neutron, Atomic physics, Nucleus, Beam (structure)
Abstract

To investigate 5H resonance states with a better instrumental resolution, we utilized the two-neutron transfer reaction 3H(t, p)5H accomplished with the use of a cryogenic liquid-tritium target and 57.5-MeV triton beam. As a result of this study, a valuable fraction of protons detected at θlab = 18°-32° in ptn coincidence events was attributed to the states of the 5H nucleus. Two resonance states situated at 1.8 plusmn; 0.1 and 2.7 ± 0.1 MeV above the t + n + n decay threshold were obtained in the missing mass energy spectrum of the 5H nucleus. The peak located close to E5H = 1.8 MeV was clearly seen in the H spectrum obtained from the energy distributions of 3H nuclei emitted in the reaction 2H(6He, 5H)3He at θ lab = 17°-32°. The width (Γobs ≤ 0.5 MeV) obtained for the two 5H resonance states is surprisingly small. A state of 4H with Eres = 3.3 MeV and γ2 = 2.3 MeV was obtained in the reaction 2H(t, p)4H from the spectra of protons leaving the target at θlab = 18°-32° and detected in coincidence with neutrons emitted in the decay of 4H nuclei. © 2003 MAIK "Nauka/Interperiodica".

Published
2003
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11. 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
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13. Investigation of Shell Effects in the Fusion-Fission Process in the Reaction $^{34}$S + $^{186}$W Near the Interaction Barrier

Author

J.M. Itkis, A. Gottardo, I. Matea, F. Hanappe, K. V. Novikov, W. H. Trzaska, G. Chubarian, G. Knyazheva, F. Azaiez, C. Schmitt, E. Vardaci, A. A. Bogachev, E.M. Kozulin, S. N. Dmitriev, I.M. Harca, D. Verney, J. Piot, T. Loktev, 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), Yu. E. Penionzhkevich, Yu. G. Sobolev, 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
Materials science, 010308 nuclear & particles physics, Shell effects, Shell (structure), Bi-modal fission, Fusion fission, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Gamma spectroscopy, Chemical physics, Scientific method, 0103 physical sciences, 010306 general physics, Nuclear Experiment, Fusion-fission
Abstract

International audience; The reaction 34S + 186W at Elab = 160 MeV was investigated with the aim of diving into the features of the fusion-fission process. Gamma rays coincident with binary reaction fragments were measured using the high efficiency gamma-ray spectrometer ORGAM at the TANDEM Accelerator facility of I.P.N., Orsay, and the time-of-flight spectrometer for fission fragments registration CORSET of the Flerov Laboratory of Nuclear Reactions (FLNR), Dubna. Evidence of symmetric and asymmetric fission modes were observed in the mass and TKE distributions, occurring due to shell effects in the fragments. The coupling of the ORGAM and CORSET setups enables the FF-γ coincident measurement which offers the opportunity to extract the isotopic distribution of the fragments of different masses formed in the aforementioned reaction and to find the exact neutron multiplicity, the average spin and average angular momenta. Details regarding the experimental setup, methods of processing the acquisitioned data and preliminary results are presented.

Published
2014
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14. Halo Structure ofB14e

Author

M. J. Lopez, S. Leenhardt, B. Benoit, N. Curtis, L. Axelsson, M. J. G. Borge, Thomas Nilsson, L. Stuttge, Giovanni Fazio, D. Guillemaud-Mueller, O. Sorlin, E. de Goes Brennand, F. Sarazin, F. M. Marqués, C. Le Brun, Graziele De Sousa Costa, B. R. Fulton, K. Riisager, A. D'Arrigo, G. Giardina, J. C. Angélique, M. Lewitowicz, N. M. Clarke, S. M. Singer, O. Dorvaux, W. N. Catford, M. Labiche, Björn Jonson, S. Grévy, F. Hanappe, S. P. G. Chappell, I. Piqueras, N. A. Orr, B. Heusch, F. de Oliveira, K. L. Jones, Gunnar Nyman, Karin Markenroth, M. G. Saint Laurent, A.C. Mueller, Alain Ninane, U. C. Bergmann, and Martin Freer

Subjects
Physics, 010308 nuclear & particles physics, Nuclear Theory, General Physics and Astronomy, Halo nucleus, 01 natural sciences, Dissociation (chemistry), Spectral line, 0103 physical sciences, Invariant mass, Neutron, Halo, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Excitation
Abstract

The two-neutron halo nucleus (14)Be has been investigated in a kinematically complete measurement of the fragments ((12)Be and neutrons) produced in dissociation at 35 MeV/nucleon on C and Pb targets. Two-neutron removal cross sections, neutron angular distributions, and invariant mass spectra were measured, and the contributions from electromagnetic dissociation (EMD) were deduced. Comparison with three-body model calculations suggests that the halo wave function contains a large nu(2s(1/2))(2) admixture. The EMD invariant mass spectrum exhibited enhanced strength near threshold consistent with a nonresonant soft-dipole excitation.

Published
2001
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15. Highest temperatures sustainable in heavy nuclei produced in Ar+Au collisions at 60 AMeV

Author

J.C. Steckmeyer, G. Rudolf, B. Heusch, L. Stuttge, G. Bizard, B. Benoit, G. Costa, A. Huck, G. Guillaume, I. Tilquin, Y. El Masri, F. Hanappe, Francesca Gulminelli, Bernard Tamain, M. Louvel, Dominique Durand, François-René Lecolley, O. Dorvaux, C. Le Brun, Alain Ninane, R. Regimbart, Thomas Keutgen, F. Lefebvres, Guesnon, Sandrine, 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 reaction, Physics, Nuclear and High Energy Physics, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Fission, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Kinetic energy, Nuclear physics, Fragmentation (mass spectrometry), Coincident, Neutron detection, Neutron, Atomic physics, Nuclear Experiment
Abstract

The specific decay mode of hot nuclei surviving fission or fragmentation and leading in the final state to the production of a large residue has been studied in Ar+Au collisions at 60 A MeV. The temperature of these residues has been obtained by analysing the kinematical characteristics (angular and kinetic energy distributions) of the coincident neutrons detected by the DEMON neutron detector, A total cross section of 50 mb has been measured for the production of residues with an initial temperature of 6 MeV or more. This result is compared with the predictions of a microscopic transport model. (C) 1997 Elsevier Science B.V.

Published
1997
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16. Study of complete and incomplete fusion for loosely bound projectiles 6He and 6Li on 165Ho and 166Er targets

Author

S. I. Sidorchuk, A. Korichi, R. Wolski, L. Stuttge, S. A. Krupko, Yu. Ts. Oganessian, G. S. Popeko, V. A. Gorshkov, A. V. Yeremin, Ch. Briançon, F. Hanappe, M. H. Ha, G. M. Ter-Akopian, A. I. Svirikhin, V. I. Chepigin, M. S. Golovkov, A. S. Fomichev, O. N. Malyshev, D. E. Katrasev, A. V. Daniel, K. Hauschild, O. Dorvaux, V. Chudoba, R. S. Slepnev, 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), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Fusion, Radiation, Isotope, 010308 nuclear & particles physics, Neutron emission, Isotopes of lithium, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Atomic and Molecular Physics, and Optics, Charged particle, 0103 physical sciences, Radiology, Nuclear Medicine and imaging, Neutron, Atomic physics, 010306 general physics, Nucleon, Isotopes of helium
Abstract

Complete fusion (CF) and incomplete fusion (ICF) reactions were studied for the cases of the loosely bound 6He and 6Li projectiles bombarding 166Er and 165Ho targets at energy of about 10 MeV/nucleon. Experiments were carried out to test an approach exploiting the measured intensities of γ rays emitted at the transitions between the yrast-band levels of reaction products formed after the termination of neutron evaporation. Partial waves feeding the CF reactions 165Ho (6Li, 5 n) 166Yb and 166Er(6He, 6 n) 166Yb as well as ICF 165Ho (6Li, α3n) 164Er and 166Er(6He, α4n) 164Er reaction channels were revealed from the obtained γ-ray data. The method of exit channel identification via the triple coincidence (γ1-γ2-light charged particle) was employed for these reactions study. (c) 2012: Pleiades Publishing, Ltd.

Published
2012
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18. Neutron Emission in Fission And Quasi-Fission of Hs

Author

I. M. Itkis, M. G. Itkis, G. N. Knyazheva, E. M. Kozulin, L. Krupa, F. Hanappe, O. Dorvaux, L. Stuttge, Yu. E. Penionzhkevich, and S. M. Lukyanov

Subjects
Chemical kinetics, Nuclear reaction, Isotope, Fission, Neutron emission, Chemistry, Nuclear Theory, Coulomb barrier, Neutron, Atomic physics, Nuclear Experiment, Nucleon
Abstract

Mass and energy distributions of fission‐like fragments obtained in the reactions 26Mg+248Cm, 36S+238U and 58Fe+208Pb leading to the formation of 266,274Hs are reported. From the analysis of TKE distributions for symmetric fragment it was found that at energies below the Coulomb barrier the bimodal fission of 274Hs, formed in the reaction 26Mg+248Cm, is observed, while in the reaction 36S+238U at these energies the main part of the symmetric fragments arises from the quasi‐fission process. At energies above the Coulomb barrier the fusion‐fission is a main process leading to the formation of symmetric fragment for the both reactions. In the case of 58Fe+208Pb reaction the quasi‐fission process is the main reaction mechanism at all measured energies. The pre‐ and post‐scission neutron multiplicities as a function of the fragment mass have been obtained for all studied reactions.

Published
2010
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19. Spectroscopy of transfermium nuclei using the GABRIELA set up at the focal plane of the VASSILISSA recoil separator

Author

K. Hauschild, A. Lopez-Martens, Ch. Briançon, P. Désesquelles, S. Garcia-Santamaria, A. Korichi, J. Robin, O. Dorvaux, J. Piot, D. Curien, B. Gall, F. Khalfallah, A. Khouaja, M. Rousseau, L. Stuttgé, N. Rowley, A. V. Yeremin, A. V. Belozerov, M. L. Chelnokov, V. I. Chepigin, V. A. Gorshkov, A. V. Isaev, I. N. Izosimov, A. P. Kabachenko, D. E. Katrasev, A. N. Kutznetzov, O. N. Malyshev, A. G. Popeko, R. N. Sagaidak, A. V. Shutov, E. A. Sokol, A. I. Svirikhin, T. Wiborg-Hagen, M. Guttormsen, A. C. Larsen, H. T. Nyhus, S. Siem, N. U. H. Syed, F. Hanappe, V. Bouchat, P. Jones, R. Borcea, G. Drafta, D. Pantelica, F. Rotaru, N. Scintee, V. Zamfir, A. Görgen, Ch. Theisen, A. Minkova, T. Kutsarova, Ch. Stodel, S. Mullins, E. Lieder, S. Antalic, Š. Šáro, M. Venhart, Yu. E. Penionzhkevich, S. M. Lukyanov, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), 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), Yu.E. Penionzhkevich, S.M. Lukyanov, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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
Nuclear reaction, Physics, Electron spectroscopy, 020206 networking & telecommunications, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear physics, Internal conversion, gamma-ray spectroscopy, spontaneous fission, 0202 electrical engineering, electronic engineering, information engineering, 29.30.Dn, 29.30.Kv, 23.60.+e, 25.45.Hi, Nuclear fusion, alpha-decay, 020201 artificial intelligence & image processing, Gamma spectroscopy, Alpha decay, Radioactive decay, Spontaneous fission
Abstract

International audience; An IN2P3-JINR collaboration has launched a project called GABRIELA at the Flerov Laboratory for Nuclear Reactions (FLNR) within the Joint Institute for Nuclear Research (JINR) in Dubna (Russia). The goal of the project is to perform gamma-ray and internal conversion electron spectroscopy of heavy nuclei produced in fusion-evaporation reactions and transported to the focal plane of the recoil separator VASSILISSA. During five experimental campaigns of GABRIELA, the detection system has gained in sensitivity and new spectroscopic information has been obtained for 249Fm, 251Fm, 253No and 255Lr.

Published
2010
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20. Experimental evidence of a v (1d5/2)2 component to the 12Be ground state

Author

Alain Ninane, L. Stuttge, Martin Freer, N. I. Ashwood, B. R. Fulton, Roy Crawford Lemmon, J. L. Lecouey, C. N. Timis, J. C. Angélique, J. S. Winfield, N. Curtis, D. Mahboub, Neven Soić, W. N. Catford, G. Normand, J. A. Tostevin, N. M. Clarke, N. A. Orr, V. A. Ziman, Steven Pain, V. Bouchat, F. Hanappe, and M. Labiche

Subjects
Physics, Nuclear physics, Component (thermodynamics), Excited state, Neutron, Atomic physics, Ground state
Abstract

Data have been obtained on exclusive single neutron knockout cross sections from 12Be to study its ground state structure. Preliminary cross sections for the first (0.32 MeV, 1/2−) and second (1.78 MeV, 5/2+, unbound) excited states in 11Be have been obtained, giving evidence of significant admixtures of both v (1p 1/2)2 and v (1d 5/2)2 configurations in the ground state of 12Be.

Published
2009
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21. Soft Dipole Mode in $^{8}$He

Author

B. G. Novatskii, M. S. Golovkov, S. A. Krupko, W. Mittig, R. S. Slepnev, E. Yu. Nikolskii, D. N. Stepanov, S. V. Stepantsov, Dan-Yang Pang, A.A. Korsheninnikov, Alain Ninane, V. A. Gorshkov, S. I. Sidorchuk, A. A. Yukhimchuk, S. V. Zlatoustovskiy, V. V. Perevozchikov, Yu. Ts. Oganessian, P. Roussel-Chomaz, L. Stuttge, S. K. Grishechkin, G.M. Ter-Akopian, L. V. Grigorenko, E. A. Kuzmin, R. Wolski, Yu. I. Vinogradov, V. Chudoba, A. M. Rodin, A. S. Fomichev, F. Hanappe, 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), Département Recherches Subatomiques (DRS-IPHC), Institut Pluridisciplinaire Hubert Curien (IPHC), 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)-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, education.field_of_study, Radiation, 25.60.Je, 21.60.Gx, Population, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Atomic and Molecular Physics, and Optics, Dipole excitation, Dipole mode, Excited state, Radiology, Nuclear Medicine and imaging, Atomic physics, Ground state, education
Abstract

The low-lying spectrum of 8 He was studied in the 3 H( 6 He, p ) 8 He transfer reaction for small center of mass angles. The 0 + ground state (g.s.) of 8 He and excited states, 2 + at 3.6–3.9 MeV and (1 + ) at 5.3–5.5 MeV, were populated with cross sections of 200, 100–250, and 90–125 μ b/sr. Some evidence for the excited state at about 7.5 MeV can be found in the data. The possible nature of the near-threshold anomaly above 2.14 MeV in 8 He is related to the population of a 1 – continuum (soft dipole excitation) with a peak energy value at about 3 MeV. This assumption can probably resolve the problem of a large uncertainty existing in the experimental data on the 8 He 2 + state energy.

Published
2009
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22. 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
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24. 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
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25. Complete and Incomplete Fusion of 6He and 6Li Projectiles with Medium Mass Targets at Energy ∼ 10 AMeV

Author

S. A. Krupko, A. V. Daniel, A. S. Fomichev, M. S. Golovkov, V. A. Gorshkov, Yu. Ts. Oganessian, G. S. Popeko, S. I. Sidorchuk, G. M. Ter-Akopian, R. S. Slepnev, V. Chudoba, L. Standylo, R. Wolski, V. I. Chepigin, D. E. Katrasev, O. N. Malyshev, A. I. Svirikhin, A. V. Yeremin, Ch. Briançon, K. Hauschild, A. Korichi, M.-H. Ha, F. Hanappe, O. Dorvaux, L. Stuttge, Ch. Goodin, J. H. Hamilton, A. V. Ramayya, K. Ernst Rehm, Birger B. Back, Henning Esbensen, C.J. (Kim) Lister, 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), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear reaction, Fusion, Isotope, 010308 nuclear & particles physics, Chemistry, Neutron emission, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, Nucleosynthesis, 0103 physical sciences, Neutron, Gamma spectroscopy, Atomic physics, 010306 general physics, Spectroscopy, 25.70.-z Low and intermediate energy heavy-ion reactions 24.10.Eq Coupled-channel and distorted-wave models 29.30.Kv X- and γ-ray spectroscopy 21.10.Sf Coulomb energies, analogue states
Abstract

International audience; Complete fusion (CF) and incomplete fusion (ICF) reactions were studied with the beams of loosely bound 6He and 6Li bombarding 166Er and 165Ho targets. Experiments were carried out to test an approach exploiting the measured intensities of γ rays emitted at the transitions between the yrast‐band levels of reaction products formed after the termination of neutron evaporation. Partial waves feeding the CF [165Ho(6Li,5n)166Yb, 166Er(6He,6n)166Yb] and ICF [165Ho(6Li,α3n)164Er, and 166Er(6He,α4n)164Er] reaction channels were revealed from the obtained γ‐ray data. © 2009 American Institute of Physics

Published
2008
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26. Properties of very n-rich He isotopes

Author

S. K. Grishechkin, Yu. Ts. Oganessian, E. A. Kuzmin, L. Stuttge, A. M. Rodin, E. Yu. Nikolskii, A. S. Fomichev, V. A. Gorshkov, R. S. Slepnev, B. G. Novatskii, Yu. I. Vinogradov, Dan-Yang Pang, S. V. Zlatoustovskiy, A. A. Yukhimchuk, R. Wolski, Alain Ninane, P. Roussel-Chomaz, F. Hanappe, L. V. Grigorenko, M. S. Golovkov, W. Mittig, S. A. Krupko, D. N. Stepanov, G.M. Ter-Akopian, S. V. Stepantsov, V. V. Perevozchikov, S. I. Sidorchuk, V. Chudoba, A.A. Korsheninnikov, 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), 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), 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, education.field_of_study, 010308 nuclear & particles physics, Properties of specific nuclei listed by mass ranges: A ≤ 5, Hadron, Population, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Spectral line, Dipole, Reactions induced by unstable nuclei, Transfer reactions, Excited state, 0103 physical sciences, Nuclear fusion, Atomic physics, 010306 general physics, Ground state, education, 25.60.-t, 25.60.Je, 27.10.+h, Excitation
Abstract

Low-energy spectra of the He-8,He-10 nuclei were investigated in the (t, p)-type reactions at small centre-of-mass angles using similar to 25AMeV beams of He-6 and He-8 nuclei. The 0(+) ground state (g.s.) of He-8 and excited states, 2(+) at 3.6-3.9MeV and (1(+)) at 5.3-5.5 MeV, were populated with cross-sections of 200, 100-250, and 90-125 mu b/sr, respectively. To account for a near-threshold anomaly observed in the He-8 spectrum the population of a 1(-) continuum (soft dipole excitation) was considered. The lowest-energy group of events in the He-10 spectrum was observed at similar to 3MeV with a cross-section of similar to 140 mu b/sr. This result is consistent with the previously reported observation of He-10 providing a new g.s. position for He-10 at about 3MeV.

Published
2008
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27. 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
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28. THE PROCESSES OF FUSION-FISSION AND QUASI-FISSION OF HEAVY AND SUPER-HEAVY NUCLEI

Author

Neil Rowley, E. M. Kozulin, L. Stuttge, M. G. Itkis, W. Trzaska, S. Beghini, M. Trotta, A. Latina, A. M. Stefanini, A. A. Bogachev, F. Hanappe, E. V. Chernysheva, V. A. Rubchenya, B. R. Behera, A. Gadea, L. Corradi, L. Krupa, G. N. Knyazheva, Fernando Scarlassara, I. M. Itkis, N. A. Kondratiev, G. Montagnoli, E. Fioretto, S. Szilner, and O. Dorvaux

Subjects
Physics, Nuclear physics, Fission, Fusion fission, Nuclear cross section
Published
2008
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29. 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
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30. Spectroscopy of heavy elements at Dubna

Author

O. Dorvaux, A. Lopez-Martens, K. Hauschild, A. V. Yeremin, A. Khouaja, A. V. Belozerov, Ch. Briançon, M. L. Chelnokov, V. I. Chepigin, D. Curien, P. Désesquelles, B. Gall, V. A. Gorshkov, M. Guttormsen, F. Hanappe, A. P. Kabachenko, F. Khalfallah, A. Korichi, A. C. Larsen, O. N. Malyshev, A. Minkova, Yu. Ts. Oganessian, A. G. Popeko, M. Rousseau, N. Rowley, R. N. Sagaidak, S. Sharo, A. V. Shutov, S. Siem, V. I. L. Stuttgé, A. I. Svirikhin, N. U. H. Syed, Ch. Theisen, P. Demetriou, R. Julin, and S. V. Harissopulos

Subjects
Physics, Nuclear physics, Recoil, Isotope, Isotonic, Nuclear structure, Nuclear Experiment, Spectroscopy
Abstract

In 2004, the GABRIELA (Gamma Alpha Beta Recoil Investigation with the Electromagnetic Analyzer VASSILISSA) collaboration started a twofold scientific program at the FLNR (Dubna) laboratory : (a) the systematic study of the behaviour of single particle states within isotopic and isotonic chains with Z = 100–104 as N varies from 152 to 162 and (b) the study of isotopes for which very little spectroscopic information is known. After discussing the Physics motivations and the experimental setup, some new results concerning the structure of 249Fm and 253No nuclei, and some preliminary results on the decay of 217Pa decay are presented.

Published
2008
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31. Quest for the $^{10}$He nucleus

Author

A. M. Rodin, A. S. Fomichev, V. A. Kuzmin, S. V. Stepantsov, A. V. Gorshkov, A.A. Korsheninnikov, E. Yu. Nikolskii, S. A. Krupko, Yu. Ts. Oganessian, F. Hanappe, D. N. Stepanov, B. G. Novatskii, O. Dorvaux, V. Bouchat, M. S. Golovkov, L. Stuttge, V. A. Gorshkov, V. Kinnard, S. I. Sidorchuk, R. S. Slepnev, V. Chudoba, G.M. Ter-Akopian, W. Mittig, P. Roussel-Chomaz, R. Wolski, Th. Materna, L. V. Grigorenko, Joint Institute for Nuclear Research (JINR), RIKEN Nishina Center for Accelerator-Based Science [Wako] (RIKEN RNC), RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), 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), 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), Joint Institute for Nuclear Research - Dubna, RIKEN Nishina Center (for Accelerator-Based Science), 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, Resolution (mass spectrometry), 010308 nuclear & particles physics, General Physics and Astronomy, Resonance, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Coincidence, Nuclear physics, medicine.anatomical_structure, 0103 physical sciences, Mass spectrum, medicine, General Materials Science, Center of mass, Physical and Theoretical Chemistry, Atomic physics, 010306 general physics, Nuclear Experiment, Nucleus
Abstract

The spectrum of $\rm ^He$ was studied by means of the $\rm ^He, p)^He$ reaction at a laboratory energy of 25 $\rm MeV/A$ and small center-of-mass angles. Missing mass spectrum of $\rm ^He$ was derived from the obtained p-8He coincidence. A resolution of 0.7 MeV was achieved in this spectrum for the measured $\rm ^He$ energy. Most likely, a well isolated group of 10 events detected between 2 and 5 MeV and showing a maximum at about 3 MeV in the spectrum of the present work exhibits the $\rm ^He$ g.s. resonance.

Published
2008
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32. Angular Correlations Between Fragment Spin and Prompt Neutron Evaporation in Spontaneous Fission of 252Cf: CORA-Demon Experiment

Author

E. Prokhorova, F. Gönnenwein, Yu. Kopatch, M. Mutterer, F. Hanappe, V. Kinnard, L. Stuttgé, O. Dorvaux, H.-J. Wollersheim, Yu. E. Penionzhkevich, E. A. Cherepanov, 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), and Yu. E. Penionzhkevich, E. A. Cherepanov

Subjects
25.85.Ca, 25.70.Pq, 23.20.En, 21.10.Gv, Cold fission, cadmium, Fission, Neutron emission, Astrophysics::High Energy Astrophysical Phenomena, Double ionization, Nuclear Theory, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear physics, spontaneous fission, Prompt neutron, 0202 electrical engineering, electronic engineering, information engineering, Neutron, Nuclear Experiment, angular correlation techniques, Spontaneous fission, Physics, Cluster decay, nuclei with mass number 220 or higher, neutrons, 020206 networking & telecommunications, nuclear fragmentation, 020201 artificial intelligence & image processing, Atomic physics
Abstract

International audience; A novel method to search for the anisotropic emission of prompt neutrons in the center-of-mass system of fission fragments is presented. The anisotropy is conjectured to be due to the large spins of fission fragments are known to carry. Triple neutron- neutron-fragment correlations in spontaneous fission of $^{252}$Cf were investigated in an exploratory experiment dubbed CORA-DEMON experiment. Fission fragments were intercepted in a double ionization chamber while neutrons were spotted in 2 two-dimensional cylindrical walls of Demon detectors with the target on the vertical cylinder axis. A new method of analysis of triple angular correlations between 2 neutrons and a fission fragment was applied. Preliminary results are reported.

Published
2007
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33. Gamma and electron spectroscopy of heavy nuclei at FLNR JINR

Author

A. V. Yeremin, A. V. Belozerov, M. L. Chelnokov, V. I. Chepigin, V. A. Gorshkov, A. P. Kabachenko, O. N. Malyshev, Yu. Ts. Oganessian, A. G. Popeko, A. V. Shutov, A. I. Svirikhin, A. Lopez-Martens, K. Hauschild, Ch. Briancon, A. Korichi, D. Curien, O. Dorvaux, B. Gall, F. Khalfallah, M. Rousseau, N. Rowley, M. Guttormsen, S. Siem, A.-C. Sunde, N. Syed, F. Hanappe, A. Minkova, S. Sharo, M. Venhart, Ch. Theisen, Yu. E. Penionzhkevich, E. A. Cherepanov, 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), 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), 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), Yu. E. Penionzhkevich, E. A. Cherepanov, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, nuclear spin, 29.30.Kv, 29.30.Dn, 27.90.+b, 21.10.Hw, nuclear energy levels, Transactinide element, 020206 networking & telecommunications, electron spectroscopy, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Electron spectroscopy, Nuclear physics, gamma-ray spectroscopy, Excited state, 0202 electrical engineering, electronic engineering, information engineering, 020201 artificial intelligence & image processing, Gamma spectroscopy, alpha-decay, Alpha decay, Atomic physics, Spin (physics), Spectroscopy, Radioactive decay, nuclear parity
Abstract

International audience; Detailed spectroscopic information of excited nuclear states in deformed transfermium nuclei is scarce. Most of the information available today has been obtained from investigations of fine structure $\alpha$ decay. Although $\alpha$ decay gives access to hindrance factors and lifetimes which are strongly correlated to shell/subshell closures and the presence of isomers, only the combined use of $\gamma$ and conversion electron spectroscopy allows the precise determination of excitation energy, spin and parity of nuclear levels. In particular, the study of odd isotopes gives crucial information on the single particle states available at and around the Fermi surface. In the following, the preliminary results of decay studies using $\alpha - \gamma$ and $\alpha - \beta$ coincidences at the focal plane of the VASSILISSA recoil separator are presented.

Published
2006
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34. Structure ofBe12: Intruderd-Wave Strength atN=8

Author

Alain Ninane, M. Labiche, N. I. Ashwood, N. Curtis, M. Freer, D. Mahboub, L. Stuttge, N. A. Orr, S.D. Pain, J. A. Tostevin, Roy Crawford Lemmon, G. Normand, V. A. Ziman, J.S. Winfield, Neven Soić, B. R. Fulton, J. C. Angélique, V. Bouchat, W. N. Catford, F. Hanappe, C. N. Timis, N. M. Clarke, and J.L. Lecouey

Subjects
Physics, Magic number (programming), SHELL model, Structure (category theory), Nuclear structure, General Physics and Astronomy, Neutron, Atomic physics, Ground state, Omega
Abstract

The breaking of the $N=8$ shell-model magic number in the $^{12}\mathrm{Be}$ ground state has been determined to include significant occupancy of the intruder $d$-wave orbital. This is in marked contrast with all other $N=8$ isotones, both more and less exotic than $^{12}\mathrm{Be}$. The occupancies of the $0\ensuremath{\hbar}\ensuremath{\omega}$ $\ensuremath{\nu}{p}_{1/2}$ orbital and the $1\ensuremath{\hbar}\ensuremath{\omega}$, $\ensuremath{\nu}{d}_{5/2}$ intruder orbital were deduced from a measurement of neutron removal from a high-energy $^{12}\mathrm{Be}$ beam leading to bound and unbound states in $^{11}\mathrm{Be}$.

Published
2006
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35. Correlation studies of theH5spectrum

Author

A. A. Yukhimchuk, S. K. Grishechkin, V. Bouchat, S. V. Zlatoustovskiy, R. Raabe, A. M. Rodin, L. V. Grigorenko, A. S. Fomichev, O. Dorvaux, A. A. Bogatchev, S. A. Krupko, L. Nalpas, Yu. I. Vinogradov, E. Yu. Nikolskii, R. S. Slepnev, R. Wolski, W. Mittig, Th. Materna, F. Hanappe, S. V. Stepantsov, R. Palit, M. S. Golovkov, M. G. Itkis, P. Roussel-Chomaz, N. A. Kondratiev, A.A. Korsheninnikov, G.M. Ter-Akopian, V. V. Perevozchikov, L. Stuttge, Yu. Ts. Oganessian, E. M. Kozulin, A. S. Denikin, V. Lapoux, C. Angulo, S. I. Sidorchuk, and V. Kinnard

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, education.field_of_study, 010308 nuclear & particles physics, Population, Hadron, 01 natural sciences, 7. Clean energy, Spectral line, Excited state, 0103 physical sciences, Mass spectrum, Atomic physics, 010306 general physics, Ground state, education, Nucleon
Abstract

The nuclear system {sup 5}H was studied using the {sup 3}H(t,p){sup 5}H transfer reaction at a laboratory energy of 57.7 MeV and small center of mass angles. The energy and angular correlations among the {sup 5}H decay fragments were obtained by complete kinematical reconstruction. A broad structure in the {sup 5}H missing mass spectrum above 2.5 MeV with a typical width of several MeV was identified as a mixture of 3/2{sup +} and 5/2{sup +} states. Analysis of interference patterns observed in the measured angular correlations disclosed the 1/2{sup +} ground state of {sup 5}H concealed in the smooth missing mass spectrum. The deduced values for the resonance energy and width are E{sub g.s.}{approx_equal}1.8 MeV and {gamma}{sub g.s.}{approx_equal}1.3 MeV. The estimated cross sections for population of the ground state and the doublet of excited states at {theta}{sub c.m.}=5 deg. are 150{+-}50 {mu}b/sr and 4.6{+-}2 mb/sr, respectively.

Published
2005
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36. YIELDS OF CORRELATED FRAGMENT PAIRS IN THE REACTION 208Pb(18O,F) OBTAINED IN γ-γ-γ COINCIDENCE METHOD

Author

M. G. Itkis, R. Lucas, E. M. Kozulin, F. Khelfallah, M. Meyer, I. Piqueras, I. Deloncle, A. A. Bogachev, O. Stezowski, A. Astier, M. Rousseau, G. Duchene, L. Stuttge, D. Curien, N. Redon, O. Dorvaux, B. J. P. Gall, F. Hanappe, L. Krupa, and Marie-Geneviève Porquet

Subjects
Crystallography, Fragment (computer graphics), Chemistry, Coincidence
Published
2005
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37. 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
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38. 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
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39. High-energy two-neutron removal fromBe10

Author

J. C. Angélique, Yannick Kerckx, N. M. Clarke, Mihai Horoi, Th. Materna, N. Curtis, F. Carstoiu, Shenaz Ahmed, D. J. Millener, N. I. Ashwood, C. N. Timis, J.L. Lecouey, N. A. Orr, Martin Freer, V. A. Ziman, F. M. Marqués, F. Hanappe, S.D. Pain, Neven Soić, W. N. Catford, G. Normand, V. Bouchat, and A. Unshakova

Subjects
Physics, Nuclear and High Energy Physics, education.field_of_study, Population, 01 natural sciences, Excited state, 0103 physical sciences, Quasiparticle, Neutron, Born approximation, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Ground state, education, 010303 astronomy & astrophysics, Energy (signal processing)
Abstract

A kinetically complete measurement of the $^{12}\mathrm{C}$($^{10}\mathrm{Be}$, $\ensuremath{\alpha}+\ensuremath{\alpha}+n$) and ($^{10}\mathrm{Be}$, $\ensuremath{\alpha}+\ensuremath{\alpha}$) reactions has been performed at a beam energy of 30 MeV/nucleon. The charged beam velocity particles were detected in an array of Si-CsI detectors placed at zero degrees, and the neutrons in an 81-element neutron array. The coincident detection of the final-state particles, produced in the breakup of $^{10}\mathrm{Be}$, allowed the reconstruction of the excitation energy in the $^{8}\mathrm{Be}$ and $^{9}\mathrm{Be}$ systems. States in $^{8}\mathrm{Be}$ were identified, in particular the ground and first-excited states; and in $^{9}\mathrm{Be}$, states at 1.68, 2.43, and (2.78, 3.05) MeV were observed. The population of these levels, in particular the 2.43 MeV $5/{2}^{\ensuremath{-}}$ level, suggests that collective excitations play an important role in the neutron removal process. Distorted wave Born approximation and Glauber-type calculations have been used to model the direct neutron removal from the $^{10}\mathrm{Be}$ ground state and the two-step removal via inelastic excitations of the $^{10}\mathrm{Be}$(2${}^{+}$) and $^{9}\mathrm{Be}(5/{2}^{\ensuremath{-}})$ excited states.

Published
2005
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40. Evidence Of A (1d[sub 52])[sup 2] Component To The 12Be Ground State

Author

W. N. Catford, S. D. Pain, N. A. Orr, Alain Ninane, G. Normand, V. Bouchat, Martin Freer, N. I. Ashwood, Neven Soić, B. R. Fulton, N. Curtis, J. S. Winfield, J. C. Angélique, M. Labiche, F. Hanappe, L. Stuttge, C. N. Timis, J.L. Lecouey, D. Mahboub, J. A. Tostevin, N. M. Clarke, V. A. Ziman, and Roy Crawford Lemmon

Subjects
Physics, chemistry.chemical_element, 020206 networking & telecommunications, 02 engineering and technology, Ion, Nuclear physics, chemistry, Coincident, Excited state, 0202 electrical engineering, electronic engineering, information engineering, 020201 artificial intelligence & image processing, Neutron, Atomic physics, Beryllium, Ground state, Glauber, Beam (structure)
Abstract

Data have been obtained on exclusive single neutron knockout cross sections from 12Be to study its ground state structure. The cross sections for the production of 11Be in its ground state (1/2 +) and first excited state (0.32 MeV, 1/2 -) have previously been measured, indicating a strong (2s 1 2) 2 component to the 12Be ground state. In the present experiment, performed at the GANIL laboratory, cross sections for the first (0.32 MeV, 1/2 -) and second (1.78 MeV, 5/2 +, unbound) excited states in 11Be were measured, which gives information on the admixture of (1p 1 2) 2 and (1d 5 2) 2 components in the ground state of 12Be. A fragmentation beam of 12Be of ∼10000 pps (95% pure) was incident on a carbon target at 41 MeV/u. The beam particles were tracked onto the target, and their energies were measured event-by-event. The beam-like residues were measured in a position sensitive telescope mounted at zero degrees, and neutrons were measured in the DeMoN array. The 1/2 - state of 11Be was identified by measuring coincident 320 keV γ-rays, using four NaI detectors. Full kinematic reconstruction of unbound states in 11Be was performed using coincident neutrons and 10Be ions. Detailed simulations were performed in order to interpret the data, and spectroscopic factors were calculated, using preliminary single particle removal cross sections calculated using a Glauber model. © 2005 American Institute of Physics.

Published
2005
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41. Experimental evidence of a $\mathrm{\ensuremath{\nu(1d_{^5/_2})^2} }$ component to the $^{12}$Be ground state

Author

N. M. Clarke, M. Labiche, Alain Ninane, D. Mahboub, N. I. Ashwood, W. N. Catford, Martin Freer, G. Normand, L. Stuttge, F. Hanappe, B. R. Fulton, J. C. Angélique, J. A. Tostevin, S.D. Pain, V. Bouchat, Roy Crawford Lemmon, J. S. Winfield, Neven Soić, N. Curtis, N. A. Orr, V. A. Ziman, C. N. Timis, J.L. Lecouey, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches 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)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Component (thermodynamics), Excited state, Hadron, Nuclear fusion, Neutron, Atomic physics, 27.20.+n - 6 <=A <= 19. 24.10.-i - Nuclear reaction models and methods. 25.60.-t - Reactions induced by unstable nuclei. 25.70.-z - Low and intermediate energy heavy-ion reactions, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Ground state
Abstract

Data have been obtained on exclusive single neutron knockout cross sections from 12Be to study its ground state structure. Preliminary cross sections for the first (0.32 MeV, $\ensuremath{^1\!/_2 ^-} $ ) and second (1.78 MeV, $\ensuremath{^5\!/_2 ^+} $ , unbound) excited states in 11Be have been obtained, giving evidence of significant admixtures of both $\ensuremath{\nu(1p_{^1\!/_2})^2} $ and $\ensuremath{\nu(1d_{^5\!/_2})^2} $ configurations in the ground state of $^{12}$Be.

Published
2004
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42. New insights into the resonance states of $^{5}$H and $^{5}$He

Author

A. A. Yukhimchuk, F. Hanappe, S. V. Stepantsov, Yu. I. Vinogradov, S. V. Zlatoustovskiy, M. S. Golovkov, E. Yu. Nikolskii, V. Bouchat, R. Palit, V. V. Perevozchikov, S. K. Grishechkin, R. Raabe, Yu. Ts. Oganessian, A. M. Rodin, L. Nalpas, A. S. Fomichev, A.A. Korsheninnikov, G.M. Ter-Akopian, O. Dorvaux, S. A. Krupko, L. V. Grigorenko, P. Roussel-Chomaz, R. Wolski, Th. Materna, V. Lapoux, C. Angulo, V. Kinnard, L. Stuttge, W. Mittig, R. S. Slepnev, S. I. Sidorchuk, RIKEN Nishina Center for Accelerator-Based Science [Wako] (RIKEN RNC), RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), 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-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), C. Gross, W. Nazarewicz, K. Rykaczewski, Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and RIKEN Nishina Center (for Accelerator-Based Science)

Subjects
Physics, Nuclear and High Energy Physics, Ion beam, 010308 nuclear & particles physics, Hadron, Nuclear reactions involving few-nucleon systems, 25.10.+s, 25.60.-t, 25.60.Je, 27.10.+h, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Deuterium, Reactions induced by unstable nuclei, Transfer reactions, Properties of specific nuclei listed by mass ranges: A≤5, 0103 physical sciences, Nuclear fusion, Tritium, Atomic physics, 010306 general physics, Ground state, Excitation, Beam (structure)
Abstract

International audience; The $^{5}$H system was produced in the $^{3}$H(t, p) $^{5}$H reaction studied at small CM angles with a 58MeV tritium ion beam. High statistics data were used to reconstruct the energy and angular correlations between the $^{5}$H decay fragments. A broad structure in the $^{5}$H missing-mass spectrum showing up above 2.5MeV was identified as a mixture of the $3/2^+$ and $5/2^+$ states. The data also present an evidence that the $1/2^+$ ground state of $^{5}$H is located at about 2MeV. Then, the $^{5}$H and $^{5}$He systems were explored by means of transfer reactions occurring in the interactions of 132MeV $^{6}$He beam nuclei with deuterium. In the $^{2}$H( $^{6}$He, $^{3}$H) reaction a T = 3/2 isobaric analog state of $^{5}$H in $^{5}$He was observed at an excitation energy of 22.0±0.3MeV with a width of 2.5±0.3MeV.

Published
2004
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43. Neutron removal and cluster breakup ofB14andBe14

Author

M. Labiche, F. Hanappe, V. A. Ziman, L. Stuttge, N. M. Clarke, F. M. Marqués, Alain Ninane, C. N. Timis, Martin Freer, W. N. Catford, V. Bouchat, S.D. Pain, N. A. Orr, Yannick Kerckx, Neven Soić, G. Normand, N. I. Ashwood, J. L. Lecouey, A. Unshakova, Th. Materna, J. C. Angélique, O. Dorvaux, and N. Curtis

Subjects
Physics, Nuclear and High Energy Physics, Nuclear Theory, Cluster (physics), Neutron, Atomic physics, Nuclear Experiment, Ground state, Nucleon, Breakup, Excitation
Abstract

Measurements of the neutron removal and cluster breakup cross sections for the neutron-rich nuclei $^{14}\mathrm{Be}$ and $^{14}\mathrm{B}$ have been performed at 34.4 and $40.8\phantom{\rule{0.3em}{0ex}}\mathrm{MeV}∕\mathrm{nucleon}$, respectively. Enhancement of the first chance cluster breakup cross section for $^{14}\mathrm{Be}$ compared to that of $^{14}\mathrm{B}$ provides evidence for a well-developed $\mathrm{He}$ cluster structure of the ground state of $^{14}\mathrm{Be}$. Measurements of both the cross sections and decay-particle velocities suggest that multistep processes play an important role in the excitation and decay of both $^{14}\mathrm{B}$ and $^{14}\mathrm{Be}$.

Published
2004
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44. Breakup reaction studies ofBe10andB10,11using aBe10beam

Author

N. Curtis, Th. Materna, W. N. Catford, Neven Soić, F. Hanappe, V. Bouchat, C. N. Timis, J. C. Angélique, Shenaz Ahmed, N. A. Orr, Steven D. Pain, V. A. Ziman, F. M. Marqués, J. C. Lecouey, N. M. Clarke, A. Unshakova, N. I. Ashwood, Alain Ninane, Martin Freer, and G. Normand

Subjects
Physics, Nuclear and High Energy Physics, education.field_of_study, Proton, Excited state, Population, Production (computer science), Atomic physics, Inelastic scattering, Nuclear Experiment, education, Ground state
Abstract

The structure of $^{10}\mathrm{Be}$ has been investigated by inelastic scattering to states above the breakup threshold using the reaction $^{12}\mathrm{C}(^{10}\mathrm{Be},^{10}\mathrm{Be}^{*}\ensuremath{\rightarrow}^{6}\mathrm{He}+^{4}\mathrm{He})^{12}\mathrm{C}$ at ${E}_{\mathit{beam}}=302\phantom{\rule{0.3em}{0ex}}\text{MeV}$. Excited states in $^{10}\mathrm{Be}$ were observed at $9.6\ifmmode\pm\else\textpm\fi{}0.1$ and $10.2\ifmmode\pm\else\textpm\fi{}0.1\phantom{\rule{0.3em}{0ex}}\text{MeV}$. No evidence was observed for the population of the ${4}^{+}$ member of the ground-state band of $^{10}\mathrm{Be}$ indicating the shell-model-like structure of the ground state. In addition, the decay of $^{8}\mathrm{Be}$, $^{10}\mathrm{B}$, and $^{11}\mathrm{B}$, populated in the two-neutron, proton pickup, breakup and $1p$ pickup reactions, was reconstructed through the detection of coincident $^{4}\mathrm{He}+^{4}\mathrm{He}$, $^{4}\mathrm{He}+^{6}\mathrm{Li}$, and $^{4}\mathrm{He}+^{7}\mathrm{Li}$ particles. Cross sections for the formation of the $^{8}\mathrm{Be}$, $^{9}\mathrm{Be}$, $^{10}\mathrm{B}$, and $^{11}\mathrm{B}$ were also deduced. Contrary to expectations, the two-neutron removal results in the production of $^{8}\mathrm{Be}$ predominantly $(80%)$ in the first excited $({2}^{+})$ state. This suggests that dynamical excitations play an important role in the neutron removal process.

Published
2004
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45. Observation of excited states in $^5$H

Author

Yu. I. Vinogradov, S. I. Sidorchuk, R. Palit, A. A. Korsheninnikov, V. Bouchat, A. A. Bogatchev, L. Stuttge, V. Kinnard, A. S. Fomichev, O. Dorvaux, L. V. Grigorenko, M. S. Golovkov, V. V. Perevozchikov, E. Yu. Nikolskii, N. A. Kondratiev, A. M. Rodin, R. Wolski, M. G. Itkis, G. M. Ter-Akopian, V. Lapoux, F. Hanappe, S. V. Stepantsov, C. Angulo, L. Nalpas, S. A. Krupko, P. Roussel-Chomaz, W. Mittig, R. S. Slepnev, A. A. Yukhimchuk, R. Raabe, Yu. Ts. Oganessian, E. M. Kozulin, Th. Materna, S. V. Zlatoustovskiy, S. K. Grishechkin, RIKEN Nishina Center for Accelerator-Based Science [Wako] (RIKEN RNC), RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), 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 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), 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 RIKEN Nishina Center (for Accelerator-Based Science)

Subjects
Physics, 010308 nuclear & particles physics, Hadron, General Physics and Astronomy, 27.10.+h. 25.10.+s, 24.50.+g. 25.55.Hp, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Charged particle, Spectral line, Baryon, Excited state, 0103 physical sciences, Mass spectrum, Physics::Accelerator Physics, Atomic physics, Nuclear Experiment, 010306 general physics, Ground state, Nucleon
Abstract

The 5H system was produced in the 3H(t,p)5H reaction studied with a 58 MeV tritium beam at small c.m. angles. High statistics data were used to reconstruct the energy and angular correlations between the 5H decay fragments. A broad structure in the 5H missing mass spectrum showing up above 2.5 MeV was identified as a mixture of the 3/2+ and 5/2+ states. The data also present evidence that the 1/2+ ground state of 5H is located at about 2 MeV.

Published
2004
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46. Fusion-Fission Dynamics of Superheavy Nuclei by the Fluctuation-Dissipation Model

Author

Louise Stuttge, Th. Materna, Masahisa Ohta, Yoshihiro Aritomo, and F. Hanappe

Subjects
Physics, Nuclear physics, Langevin equation, Mass distribution, Fission, Neutron emission, Scientific method, Nuclear Theory, Dynamics (mechanics), Physics::Atomic and Molecular Clusters, Trajectory, Dissipation, Nuclear Experiment
Abstract

We discuss the fusion-fission process in superheavy mass region. By analyzing the mass distribution of fission fragments, we can distinguish between fusion-fission process and quasi-fission process. We investigate the process using the fluctuation-dissipation model and employ the three-dimensional Langevin equation. We find a lot of mass symmetric fission events come from the quasi-fission process in the superheavy mass region. In order to classify the fusion-fission paths and compare with the experimental data directly, we analyze the pre-scission neutron emission in the correlation with the fission fragments. The neutron multiplicity depends on the travelling time of the trajectory. It is useful to investigate the fusion-fission process.

Published
2004
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47. 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

48. Experimental study of $^{4}$H in the reactions $^{2}$H(t,p) and $^{3}$H(t,d)

Author

M. S. Golovkov, S. I. Sidorchuk, Yu. Ts. Oganessian, Yu. I. Vinogradov, Alain Ninane, E. Yu. Nikolskii, R. Wolski, L. Stuttge, A. A. Yukhimchuk, Th. Materna, W. Mittig, A.A. Korsheninnikov, F. Hanappe, P. Roussel-Chomaz, S. V. Stepantsov, V. V. Perevozchikov, R. S. Slepnev, G.M. Ter-Akopian, D. D. Bogdanov, A. M. Rodin, A. S. Fomichev, RIKEN Nishina Center for Accelerator-Based Science [Wako] (RIKEN RNC), RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), 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), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and RIKEN Nishina Center (for Accelerator-Based Science)

Subjects
Physics, inorganic chemicals, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Scattering, technology, industry, and agriculture, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Resonance (particle physics), 27.10.+h, 25.60.Je, Nuclear physics, Recoil, Deuterium, 0103 physical sciences, cardiovascular system, polycyclic compounds, Tritium, Neutron, lipids (amino acids, peptides, and proteins), 010306 general physics, Beam (structure), S-matrix
Abstract

The H-4 resonance was investigated in the transfer reactions H-2(t,p)H-4 and H-3(t,d)H-4 using cryogenic liquid targets of deuterium and tritium and 58 MeV triton beam. The multidetector system with a large angular acceptance was used to measure the recoil protons and deuterons in coincidences with tritons or neutrons from the decay of H-4. Data analysis involved careful considerations made for the competing processes of final state interaction and quasifree scattering. The experimental data show a peak with resonance parameters E-res = 3.05 +/- 0.19 MeV and Gamma(obs) = 4.18 +/- 1.02 MeV. The pole of S-matrix corresponding to the physical values of energy and width, E-0 = 1.99 +/- 0.37 MeV and Gamma(0) = 2.85 +/- 10.3 MeV, has been extracted. (C) 2004 Elsevier B.V. All rights reserved.

Published
2004
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49. 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
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50. Helium Clustering in Neutron-Rich Be Isotopes

Author

M. Freer, N. Curtis, Roy Crawford Lemmon, G. Normand, Th. Materna, V. Bouchat, B. R. Fulton, V. A. Ziman, Alain Ninane, J. C. Angélique, W. N. Catford, O. Dorvaux, N. A. Orr, Shenaz Ahmed, Yannick Kerckx, F. Hanappe, A. Unshakova, C. N. Timis, J.L. Lecouey, Neven Soić, N. I. Ashwood, F. M. Marqués, J. S. Winfield, L. Stuttge, S.D. Pain, M. Labiche, N. M. Clarke, 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 and High Energy Physics, Isotopes of germanium, Isotopes of samarium, Knockout, Nuclear Theory, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Isotopes of oxygen, Clustering, Nuclear physics, Breakup, Cross-sections, Anti-symmetrized Molecular Dynamics, Beryllium, Isotopes of protactinium, 0103 physical sciences, Physics::Atomic Physics, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, Isotopes of argon, Physique atomique et nucléaire, Isotopes of nitrogen, Atomic physics, Isotopes of beryllium, s-process
Abstract

Measurements of the helium-cluster breakup and neutron removal cross-sections for neutron-rich Be isotopes 10-12,14Be are presented. These have been studied in the 30 to 42 MeV/nucleon energy range where reaction measurements are proposed to be sensitive to the cluster content of the ground-state wave-function. These measurements provide a comprehensive survey of the decay processes of the Be isotopes by which the valence neutrons are removed revealing the underlying α-α core-cluster structure. The measurements indicate that clustering in the Be isotopes remains important up to the drip-line nucleus 14Be and that the dominant helium-cluster structure in the neutron-rich Be isotopes corresponds to α-Xn-α. © 2003 Published by Elsevier B.V., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2003
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