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12 results on '"Louise Stuttge"'

1. Asymmetric fission around lead: The case of Po198

Author

D. Arora, Kavita Rani, Arka Chatterjee, Devinder Kaur, S. K. Duggi, Gurwinder Kaur, Honey Arora, Shilpi Gupta, Louise Stuttge, C. Schmitt, Vivek Mishra, K. S. Golda, M. S. A. Kumar, A. K. Shrivastava, Akhil Jhingan, K. Chauhan, P. N. Patil, P. Sugathan, N. Saneesh, K. Mahata, Institut Pluridisciplinaire Hubert Curien (IPHC), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], Physics, Fusion, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Distribution (number theory), 010308 nuclear & particles physics, Fission, Nuclear Theory, Function (mathematics), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Kinetic energy, 01 natural sciences, Interpretation (model theory), 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, ComputingMilieux_MISCELLANEOUS, Energy (signal processing), Excitation
Abstract

Asymmetric low-energy fission of neutron-deficient nuclei around lead is addressed with the measurement of fragment mass and total kinetic energy properties for the fissioning system $^{198}\mathrm{Po}$ produced in heavy-ion fusion. Interpretation of the measurement for such a transitional nucleus at finite excitation energy is challenging. The presence of asymmetric partitions is suggested by the observed weak dependence of the total kinetic energy on mass and by the nonmonotonic evolution of the fragment-mass distribution width with excitation energy. The interpretation is supported by microscopic model calculations as well as by the results of an advanced semiempirical code. Combined with previous experiments in the region, the present measurement contributes to establish the evolution of the fragment-mass distribution as a function of the fissioning system. The connection between the ``new'' and the ``old'' islands of asymmetric fission is discussed.

Published
2019
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2. Fusion-fission and quasifission of superheavy systems withZ=110–116formed inCa48-induced reactions

Author

L. Krupa, A. A. Bogachev, Francis Hanappe, E. M. Kozulin, Wladyslaw Henryk Trzaska, I. M. Itkis, G. G. Chubarian, G. N. Knyazheva, Christian Schmitt, Louise Stuttge, E. V. Chernysheva, O. Dorvaux, and M. G. Itkis

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Fission, Significant part, Coulomb barrier, Fusion fission, Kinetic energy, 01 natural sciences, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Energy (signal processing)
Abstract

Background: In heavy-ion-induced reactions the mechanism leading to the formation of the compound nucleus and the role of quasifission is still not clear.Purpose: Investigation of the quasifission process of superheavy composite systems with $Z=110\text{\ensuremath{-}}116$ and comparison with properties of fusion-fission and quasifission of lighter composite systems.Method: Mass and energy distributions of fissionlike fragments formed in the reactions $^{48}\mathrm{Ca}+^{232}\mathrm{Th}$, ${}^{238}\mathrm{U}$, ${}^{244}\mathrm{Pu}$, and ${}^{248}\mathrm{Cm}$ at energies near the Coulomb barrier have been measured using the double-arm time-of-flight spectrometer CORSET at the U-400 cyclotron of the FLNR JINR.Results: The most probable fragment masses as well as total kinetic energies and their dispersions in dependence on the interaction energies and ion-target combinations have been studied for asymmetric and symmetric fragments formed in the reactions. The capture cross sections were obtained for the reactions $^{48}\mathrm{Ca}+^{244}\mathrm{Pu}$ and ${}^{248}\mathrm{Cm}$. The lower limits for fission barriers of ${}^{283\ensuremath{-}286}\mathrm{Cn}$, ${}^{289\ensuremath{-}292}\mathrm{Fl}$, and ${}^{293\ensuremath{-}296}\mathrm{Lv}$ compound nuclei were estimated.Conclusions: Analysis of the properties of symmetric fragments has shown that a significant part of these fragments may be attributed to fusion-fission process for the reactions ${}^{48}\mathrm{Ca}{+}^{238}\mathrm{U}$, ${}^{244}\mathrm{Pu}$, and ${}^{248}\mathrm{Cm}$.

Published
2014
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3. Structure of13Be probed via secondary-beam reactions

Author

H. Al Falou, J.L. Lecouey, N. A. Orr, N. I. Ashwood, Alain Ninane, Louise Stuttge, Martin Freer, D. Price, A. Leprince, N. Curtis, N. Patterson, E. de Goes Brennand, J. C. Angélique, P. Haigh, B. Laurent, T. Bloxham, B. A. Brown, J. S. Thomas, G. Randisi, B. Bastin, Francis Hanappe, W. N. Catford, N. L. Achouri, C. Harlin, Franck Delaunay, F. M. Marqués, 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), 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 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), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université 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, Nuclear Theory, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 3. Good health, Virtual state, Level structure, Invariant mass, Neutron, Nuclear Experiment (nucl-ex), Atomic physics, Nuclear Experiment, Nucleon, Beam (structure)
Abstract

The low-lying level structure of the unbound neutron-rich nucleus $^{13}$Be has been investigated via breakup on a carbon target of secondary beams of $^{14,15}$B at 35 MeV/nucleon. The coincident detection of the beam velocity $^{12}$Be fragments and neutrons permitted the invariant mass of the $^{12}$Be+$n$ and $^{12}$Be+$n$+$n$ systems to be reconstructed. In the case of the breakup of $^{15}$B, a very narrow structure at threshold was observed in the $^{12}$Be+$n$ channel. Contrary to earlier stable beam fragmentation studies which identified this as a strongly interacting $s$-wave virtual state in $^{13}$Be, analysis here of the $^{12}$Be+$n$+$n$ events demonstrated that this was an artifact resulting from the sequential-decay of the $^{14}$Be(2$^+$) state. Single-proton removal from $^{14}$B was found to populate a broad low-lying structure some 0.70 MeV above the neutron-decay threshold in addition to a less prominent feature at around 2.4 MeV. Based on the selectivity of the reaction and a comparison with (0-3)$\hbar\omega$ shell-model calculations, the low-lying structure is concluded to most probably arise from closely spaced J$^\pi$=1/2$^+$ and 5/2$^+$ resonances (E$_r$=0.40$\pm$0.03 and 0.85$^{+0.15}_{-0.11}$ MeV), whilst the broad higher-lying feature is a second 5/2$^+$ level (E$_r$=2.35$\pm$0.14 MeV). Taken in conjunction with earlier studies, it would appear that the lowest 1/2$^+$ and 1/2$^-$ levels lie relatively close together below 1 MeV., Comment: 14 pages, 13 figures, 2 tables. Accepted for publication in Physical Review C

Published
2014
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4. Exotic Molecular States in12Be

Author

G.R. Kelly, M. Freer, I. Piqueras, Thomas Nilsson, N. A. Orr, Giorgio Giardina, B. Benoit, C. Le Brun, J. T. Murgatroyd, S M Singer, M. Labiche, W. N. Catford, Francis Hanappe, N. Curtis, L. Axelsson, C. Gregori, Alain Ninane, S. Leenhardt, M. Motta, Karin Markenroth Bloch, U. C. Bergmann, B. R. Fulton, E. de Goes Brennard, J. C. Angélique, O. Sorlin, F. M. Marqués, O. Dorvaux, M. Lewitowicz, S. P. G. Chappell, Louise Stuttge, S. Grévy, D L Watson, N. M. Clarke, A. D’Arrigo, M. G. Saint Laurent, 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), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Physics, Range (particle radiation), Cluster decay, Spins, 010308 nuclear & particles physics, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Moment of inertia, Breakup, 01 natural sciences, Excited state, 0103 physical sciences, Cluster (physics), Atomic physics, Nuclear Experiment, 010306 general physics, Excitation, Nuclear Physics
Abstract

The breakup of 12Be into 6He+6He and 4He+8He has been studied using a 378 MeV 12Be beam inelastically excited by 12C and (CH2)n targets. The measurements indicate that breakup occurs from rotational states in the 10 to 25 MeV excitation energy interval, with spins in the range of 4ħ to 8ħ. The inferred moment of inertia is consistent with the cluster decay of an exotic molecular structure in 12Be, which may be associated with an α-4n-α cluster configuration.

Published
1999
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5. Fission and quasifission modes in heavy-ion-induced reactions leading to the formation of Hs*

Author

Yu. Ts. Oganessian, E. M. Kozulin, L. Krupa, A. Ya. Rusanov, E. de Goes Brennand, Louise Stuttge, Valery Zagrebaev, Emanuele Vardaci, F. Goennenwein, E. V. Chernysheva, I. M. Itkis, Francis Hanappe, M. G. Itkis, A. A. Bogachev, G. N. Knyazheva, O. Dorvaux, I. M., Itki, E. M., Kozulin, M. G., Itki, G. N., Knyazheva, A. A., Bogachev, E. V., Chernysheva, L., Krupa, Oganessian, Y. u. T. s., V. I., Zagrebaev, Rusanov, A. Y. a., F., Goennenwein, O., Dorvaux, L., Stuttge, F., Hanappe, Vardaci, Emanuele, and E., de Goes Brennand

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Isotope, Fission, Coulomb barrier, Spectral line, Charged particle, Ion, superheavy elements, Crystallography, fission, quasifission, Atomic physics, Energy (signal processing)
Abstract

Mass and energy distributions of binary reaction products obtained in the reactions {sup 22}Ne+{sup 249}Cf,{sup 26}Mg+{sup 248}Cm, {sup 36}S+{sup 238}U, and {sup 58}Fe+{sup 208}Pb have been measured. All reactions lead to Hs isotopes. At energies below the Coulomb barrier the bimodal fission of Hs{sup *}, formed in the reaction {sup 26}Mg+{sup 248}Cm, is observed. In the reaction {sup 36}S+{sup 238}U, leading to the formation of a similar compound nucleus, the main part of the symmetric fragments arises from the quasifission process. At energies above the Coulomb barrier fusion-fission is the main process leading to the formation of symmetric fragments for both reactions with Mg and S ions. In the case of the {sup 58}Fe+{sup 208}Pb reaction the quasifission process dominates at all measured energies.

Published
2011
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6. High-K, t1/2 = 1.4(1)ms, isomeric state inLr255

Author

A. P. Kabachenko, Magne Guttormsen, Neil Rowley, D. Curien, N. U. H. Syed, F. Khalfallah, M. L. Chelnokov, O. Dorvaux, Alexey Belozerov, A. G. Popeko, M. Venhart, Louise Stuttge, Francis Hanappe, Andreas Görgen, A. Shutov, A. I. Svirikhin, A. Lopez-Martens, A. Minkova, S. Saro, S. Antalic, André Larsen, B. Gall, M. Rousseau, V. I. Chepigin, V. A. Gorshkov, Ch. Briançon, K. Hauschild, Ch. Theisen, O. N. Malyshev, Alexander Yeremin, and Sunniva Siem

Subjects
Physics, Nuclear and High Energy Physics, Valence (chemistry), Proton, 010308 nuclear & particles physics, Hadron, 01 natural sciences, Baryon, 0103 physical sciences, Quasiparticle, Neutron, Atomic physics, 010306 general physics, Nucleon, Excitation
Abstract

An isomeric state in {sup 255}Lr with a half-life of t{sub 1/2} = 1.4(1) ms and E{sub x}>720-keV has been observed for the first time using the GABRIELA setup at the focal plane of the VASSILISSA separator. Based on its K-forbiddeness, the configuration of the state is most probably formed by coupling the valence proton to a two quasiparticle neutron excitation. Possible three quasiparticle configurations are discussed.

Published
2008
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7. Measurements of the breakup and neutron removal cross sections forC16

Author

J. L. Lecouey, Louise Stuttge, A. Unshakova, N. A. Orr, Neven Soić, Francis Hanappe, N. Curtis, Alain Ninane, Thomas Materna, N. I. Ashwood, J. C. Angélique, Nicholas Clarke, O. Dorvaux, Yannick Kerckx, F. M. Marqués, Steven Pain, G. Normand, Martin Freer, M. Labiche, V. Bouchat, W. N. Catford, C. N. Timis, V. A. Ziman, 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), CHARISSA, and Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, 25.70.Pq.25.70.Mn, 25.40.Hs, 25.60.Dz, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Q value, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Two-body problem, Breakup, 01 natural sciences, Nuclear physics, Cross section (physics), 0103 physical sciences, Cluster (physics), Neutron, Atomic physics, cluster breakup, neutron removal, quasielastic reactions, 16C, cluster structure, Nuclear Experiment, 010306 general physics, Ground state, Radioactive decay
Abstract

Measurements of the breakup and the neutron removal reactions of $^{16}\mathrm{C}$ have been made at 46 MeV∕A and the decay cross sections measured. A correlation between the cluster breakup channels and the reaction $\mathrm{Q}$ value suggests that the reaction mechanism is strongly linked to quasielastic processes. No enhancement of the two-body cluster breakup cross section is seen for $^{16}\mathrm{C}$. This result would indicate that $^{16}\mathrm{C}$ does not have a well developed cluster structure in the ground state, in agreement with recent calculations.

Published
2004
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8. Exclusive breakup measurements for Be9

Author

P. J. Leask, Stanley Singer, B. Benoit, B. R. Fulton, R. L. Cowin, Laurent Donadille, Louise Stuttge, N. A. Orr, Marie Paule Nicoli, Alain Ninane, Nicholas Clarke, Martin Freer, R. J. Woolliscroft, Joel Tillier, and Francis Hanappe

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Scattering, Carbon-12, Parity (physics), Breakup, 01 natural sciences, Nuclear physics, medicine.anatomical_structure, Excited state, 0103 physical sciences, medicine, Atomic physics, 010306 general physics, 10. No inequality, Nucleus
Abstract

The first exclusive breakup measurements for the nucleus Be-9 are presented. Breakup via several discrete states is observed following scattering off C-12 and Pb-208. The results support the prediction of a recent microscopic cluster calculation for a strong n+Be-8(2(+)) state component in the second excited state.

Published
2004
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9. Unexpected entrance-channel effect in the fission of216Ra*

Author

Neil Rowley, M. G. Itkis, Louise Stuttge, V. M. Voskressensky, Fernando Scarlassara, I. V. Pokrovsky, A. M. Vinodkumar, M. Trotta, Yu Chizhov, N. A. Kondratiev, O. Dorvaux, Ya Rusanov, I. M. Itkis, S. Beghini, A. Latina, L. Corradi, G. N. Kniajeva, E. M. Kozulin, Francis Hanappe, A. V. Yeremin, Suzana Szilner, G. Montagnoli, R. N. Sagaidak, A. Gadea, and A. M. Stefanini

Subjects
Physics, Nuclear and High Energy Physics, Cluster decay, 010308 nuclear & particles physics, Fission, 01 natural sciences, Entrance channel, Yield (chemistry), 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Excitation, Energy (signal processing)
Abstract

We have studied the mass and energy distributions of fission fragments from the two reactions ${}^{12}\mathrm{C}{+}^{204}\mathrm{Pb}$ and ${}^{48}\mathrm{Ca}{+}^{168}\mathrm{Er}$ that lead to the same compound nucleus ${}^{216}{\mathrm{Ra}}^{*}.$ Despite the fact that the excitation energy was around 40 MeV in both cases, the contribution from asymmetric fission in the first reaction is only around 1.5% but is about 30% in the second. This marked increase in the yield of asymmetric products is connected to the quasifission process, in which important shell effects become evident. The mass-energy distributions are interpreted in terms of an independent decay mode competing with the normal fusion-fission process and possibly leading to a significant suppression of the fusion cross section itself.

Published
2003
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10. Spallation neutron production by 0.8, 1.2, and 1.6 GeV protons on various targets

Author

Esteban Martínez, J.E. Thun, F. Borne, E. Petibon, Louise Stuttge, F. Lefebvres, J. Fréhaut, J.C. Duchazeaubeneix, Dominique Durand, Francis Hanappe, Y. Patin, W. Wlazlo, S. Crespin, D.M. Whittal, C. Le Brun, R. Legrain, P. Pras, J.M. Durand, S. Ménard, S. I. Meigo, Y. Terrien, J.F. Lecolley, X. Ledoux, S. Leray, F. Brochard, A. Boudard, G. Milleret, D. Drake, C. Varignon, M. Louvel, François-René Lecolley, 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), Laboratoire National Saturne (LNS), 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 de Physique Théorique et Appliquée (DPTA), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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 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), 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), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Physics, Nuclear and High Energy Physics, High energy, Particle physics, Proton, 010308 nuclear & particles physics, Fission, Monte Carlo method, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 3. Good health, Nuclear physics, Cascade, 25.40.Sc, 24.10.Lx, 25.60.Dz, 29.25.Dz, 0103 physical sciences, Neutron source, Spallation, Neutron, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics
Abstract

Spallation neutron production in proton induced reactions on Al, Fe, Zr, W, Pb and Th targets at 1.2 GeV and on Fe and Pb at 0.8, and 1.6 GeV measured at the SATURNE accelerator in Saclay is reported. The experimental double-differential cross-sections are compared with calculations performed with different intra-nuclear cascade models implemented in high energy transport codes. The broad angular coverage also allowed the determination of average neutron multiplicities above 2 MeV. Deficiencies in some of the models commonly used for applications are pointed out., 20 pages, 32 figures, revised version, accepted fpr publication in Phys. Rev. C

Published
2002
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11. Helium breakup states in10Beand12Be

Author

Alain Ninane, S. Grévy, Francis Hanappe, U. C. Bergmann, Thomas Nilsson, S. P. G. Chappell, M. Freer, B. Benoit, Karin Markenroth Bloch, E. de Goes Brennard, W. N. Catford, O. Sorlin, Louise Stuttge, S. Leenhardt, N. Curtis, C. Le Brun, A. D'Arrigo, C. Gregori, S. M. Singer, Leif Axelsson, G. Giardina, N. M. Clarke, I. Piqueras, M. Labiche, M. Lewitowicz, F. M. Marqués, N. A. Orr, G.R. Kelly, B. R. Fulton, J. C. Angélique, O. Dorvaux, M. G. Saint Laurent, J. T. Murgatroyd, and D. L. Watson

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), 010308 nuclear & particles physics, chemistry.chemical_element, Inelastic scattering, Breakup, 01 natural sciences, Nuclear physics, chemistry, 0103 physical sciences, Cluster (physics), Neutron, Atomic physics, 010306 general physics, Beam (structure), Helium, Excitation
Abstract

The breakup of 10,12Be into He clusters has been studied using the p,12C(12Be,6He,6He) and 12C(12Be,4He,6He) inelastic scattering and two neutron transfer reactions with a 378 MeV 12Be beam incident on 12C and (CH2)n targets. Evidence has been found for three new states in 10Be at excitation energies of 13.2, 14.8, and 16.1 MeV, which may be associated with a 4He+6He cluster structure. The evidence for He cluster states in 12Be in the excitation energy range 12 to 25 MeV is also discussed.

Published
2001
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12. 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
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