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86 results on '"N. Alamanos"'

1. Topical Issue on Giant, Pygmy, Pairing Resonances and Related Topics

Author: E. Vigezzi, N. Alamanos, and Ricardo A. Broglia
Subjects: Pier, Nuclear physics, Physics, Nuclear and High Energy Physics, Pairing, Tribute
Published: 2019

2. Study of the $^6{\mathrm {Li}}+p$ and $^7{\mathrm {Li}}+p$ Systems in the Continuum Discretized Coupled Channels Approach

Author: L. Acosta, V. Soukeras, Salvatore Calabrese, A. Pakou, A. Foti, N. Alamanos, D. Torresi, Francesco Cappuzzello, Ismael Martel, N. Keeley, Daniele Carbone, C. Agodi, O. Sgouros, K. Rusek, Manuela Cavallaro, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay
Subjects: Physics, Classical mechanics, Discretization, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Continuum (topology), 0103 physical sciences, General Physics and Astronomy, 01 natural sciences
Abstract: International audience; A complete study of the 6,7Li + p reactions was performed by measuring the complete net of reaction channels at the energy range of ∼ 2 to 5 MeV/nucleon. The experiments were performed at the MAGNEX facility of the Istituto Nazionale di Fisica Nucleare-Laboratori Nazionali del Sud (INFN-LNS) in Catania. The breakup channel was identified by means of a new algorithm, MULTIP, which gives the possibility of following up the decay of the nucleus into two or more constituent particles from the rest frame of the nucleus itself to the laboratory frame. Angular distributions were obtained for all reaction products and were considered within the Continuum Discretized Coupled Channels (CDCC) framework. The results of the CDCC calculations were found in a very good agreement with the experimental data presenting a strong evidence for the important influence of coupling to breakup on the elastic channel.
Published: 2019

3. Study of continuum excitation by light weakly bound projectiles on proton target

Author: A. Foti, Francesco Cappuzzello, C. Agodi, O. Sgouros, V. Soukeras, N. Alamanos, A. Pakou, Salvatore Calabrese, K. Rusek, Ismael Martel, Daniele Carbone, N. Keeley, Manuela Cavallaro, Luis Acosta, D. Torresi, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay
Subjects: Elastic scattering, Physics, Range (particle radiation), Proton, 010308 nuclear & particles physics, QC1-999, Monte Carlo method, Continuum (design consultancy), Rest frame, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Breakup, 01 natural sciences, Continuum excitation, Nuclear physics, Proton target, 0103 physical sciences, 010306 general physics, Excitation
Abstract: Elastic scattering and breakup angular distribution measurements for the systems 6,7Li + p were performed at the MAGNEX facility of the Istituto Nazionale di Fisica Nucleare-Laboratori Nazionali del Sud (INFN-LNS) in Catania, in the energy range of (2.3-5.4)AMeV. The breakup channel was identified and quantified adopting the algorithm MULTIP.Within this algorithm which is a Monte Carlo simulation code, the history of the breakup fragments can be tagged from the rest frame of the decay nucleus itself to the laboratory frame. Angular distribution data of both elastic scattering and breakup were analyzed under the same theoretical model and the influence of continuum on the elastic channel was investigated., The research leading to these results was partially funded by the European Union Seventh Framework Programme FP7/2007-2013 (Grant Agreement No. 262010ENSAR) and also by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (Grant Agreement No. 714625).
Published: 2019

4. 6Li+28Si reaction cross sections at sub-barrier energies

Author: T. J. Mertzimekis, A. Musumarra, G. Perdikakis, A. Spyrou, K. Russek, P.A. Assimakopoulos, A. Pakou, D. Pierroutsakou, N. Divis, G. Kalyva, Ch. Zarkadas, G. Doukelis, D. Roubos, A. Lagoyannis, C. Papaxristodoulou, N. G. Nicolis, Sotirios Harissopulos, and N. Alamanos
Subjects: Physics, Anomaly (physics), Molecular physics
Abstract: Total reaction cross sections at near barrier energies (9-13 MeV) were measured for the system 6Li+28Si adopting a new technique. The results will be discussed in terms of the threshold anomaly at barrier
Published: 2019

5. Breakup of Li6+p at near-barrier energies and the effect on elastic scattering

Author: M. Mazzocco, G. Santagati, V. Soukeras, A. Cunsolo, E. Strano, K. Rusek, A. Foti, A. Pakou, Efstathios Stiliaris, L. Acosta, N. Keeley, P. Figuera, Ismael Martel, Manuela Cavallaro, G. Marquínez-Durán, N. Alamanos, Salvatore Calabrese, Francesco Cappuzzello, O. Sgouros, C. Agodi, D. Torresi, D. Pierroutsakou, K. Zerva, Daniele Carbone, J. P. Fernández-García, Maria Fisichella, and A. Di Pietro
Subjects: Physics, Coupling, Elastic scattering, 010308 nuclear & particles physics, Continuum (design consultancy), Breakup, 01 natural sciences, Resonance (particle physics), Cross section (physics), 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, P system, Excitation
Abstract: Exclusive breakup measurements have been performed for the Li6+p system in inverse kinematics at Li6 incident energies of 25 and 29 MeV. The results are considered in the Continuum Discretized Coupled-Channels framework, together with elastic scattering data at 16, 20, 25, and 29 MeV, obtained simultaneously in the same experiment and reported previously. Good agreement between data and theory is observed, interpreted as evidence for strong coupling to the continuum. The direct and sequential (via the Li631+ resonance) breakup cross sections are found to be equally large at the higher incident energies but the dominant effect on the elastic scattering is due to coupling to the sequential breakup. This effect remains dominant even at the lowest energy of 16 MeV, despite the negligible cross section for excitation of the resonance at this low incident energy.
Published: 2017

6. Low-lying states and structure of the exotic 8He via direct reactions on the proton

Author: F. Skaza, A. Gillibert, R. Wolski, D. Beaumel, A. Drouart, J. L. Sida, K. Rusek, V. Lapoux, P. Roussel-Chomaz, A. Pakou, N. Keeley, F. Auger, Lydie Giot, J.A. Scarpaci, E. Becheva, Y. Blumenfeld, E. C. Pollacco, N. Alamanos, Elias Khan, R. Raabe, S. V. Stepantsov, F. Delaunay, L. Nalpas, Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), 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), Peter von Neumann-Cosel, Thomas Aumann, and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Resonance (particle physics), Charged particle, medicine.anatomical_structure, Excited state, 0103 physical sciences, medicine, Atomic physics, Nuclear Experiment, 010306 general physics, Ground state, Nucleus, Excitation
Abstract: The structure of the light exotic nucleus 8 He was investigated using direct reactions of the 8 He SPIRAL beam on a proton-rich target. The (p,p') scattering to the 2 1 + state, the (p,d) 7 He and (p,t) 6 He transfer reactions, were measured at the energy E l a b = 15.7 A.MeV . The light charged particles (p,d,t) were detected in the MUST Si-strip telescope array. The excitation spectrum of 8 He was extracted from the (p,p') reaction. Above the known 2 1 + excited state at 3.6 MeV, a second resonance was found around 5.4 MeV. The cross sections were analyzed within the coupled-reaction channels framework, using microscopic potentials. It is inferred that the 8 He ground state has a more complex neutron-skin structure than suggested by previous α + 4 n models assuming a pure ( 1 p 3 / 2 ) 4 configuration.
Published: 2007

7. Reexamination ofLi6+pelastic scattering in inverse kinematics

Author: Efstathios Stiliaris, A. Cunsolo, M. Mazzocco, J. P. Fernández-García, K. Rusek, Ismael Martel, E. Strano, V. Soukeras, Daniele Carbone, M. Bondì, M. De Napoli, Maria Fisichella, Luis Acosta, C. Agodi, N. Alamanos, N. Keeley, D. Nicolosi, D. Torresi, A. Di Pietro, P. Figuera, O. Sgouros, Francesco Cappuzzello, Manuela Cavallaro, D. Pierroutsakou, A. Pakou, A. Foti, and G. Marquínez-Durán
Subjects: Elastic scattering, Physics, Nuclear and High Energy Physics, Discretization, Inverse kinematics, Spectrometer, 010308 nuclear & particles physics, Physics::Medical Physics, 01 natural sciences, Nuclear physics, 0103 physical sciences, Continuum (set theory), Nuclear Experiment, 010306 general physics
Abstract: Elastic-scattering measurements have been performed for the $^{6}\mathrm{Li}+p$ system in inverse kinematics at the energies of 16, 20, 25, and 29 MeV. The heavy ejectile was detected by the large acceptance MAGNEX spectrometer at the Laboratori Nazionali del Sud in Catania, Italy. The results are considered in a Jeukenne-Lejeune-Mahaux and a continuum discretized coupled-channel calculation framework.
Published: 2015

8. Elastic scattering for the system 6Li + p at near barrier energies with MAGNEX

Author: V. Soukeras, K. Rusek, O. Sgouros, J. P. Fernández-García, A. Di Pietro, D. Torresi, D. Nicolosi, G. Marquínez-Durán, Daniele Carbone, D. Pierroutsakou, P. Figuera, M. Mazzocco, C. Agodi, M. Bondì, Luis Acosta, Manuela Cavallaro, M. De Napoli, Maria Fisichella, N. Alamanos, A. Pakou, A. Cunsolo, Efstathios Stiliaris, E. Strano, Francesco Cappuzzello, N. Keeley, A. Foti, Ismael Martel, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, and European Union (UE)
Subjects: coupling channel calculations, Physics, Elastic scattering, Angular range, Inverse kinematics, Spectrometer, Coupling channel calculations, Physics::Medical Physics, elastic scattering, compound versus direct, Physics and Astronomy (all), Span (engineering), Compound versus direct, Nuclear physics, Center of mass, Nuclear Experiment, P system
Abstract: Elastic scattering measurements have been performed for the 6Li+p system in inverse kinematics at the energies of 16, 20, 25 and 29 MeV. The heavy ejectile was detected by the large acceptance MAGNEX spectrometer at the Laboratori Nazionali del Sud (LNS) in Catania, in the angular range between ∼20 and 120 in the laboratory system, giving us the possibility to span almost a full angular range in the center of mass system. Results will be presented and discussed for one of the energies. European Union 262010-ENSAR
Published: 2015

9. The 6Li exclusive breakup on 28Si at 13 MeV

Author: G. Doukelis, N. M. Clarke, N. Alamanos, NJ Davis, A. Pakou, A. Musumarra, N. Patronis, A. Lagoyannis, T. J. Mertzimekis, M. Kokkoris, D. Pierroutsakou, G. Kalyva, D. Roubos, N. G. Nicolis, K. Rusek, Ch. Zarkadas, Georgios Perdikakis, C. A. Papachristodoulou, and S. Spyrou
Subjects: Nuclear reaction, Physics, Nuclear and High Energy Physics, Nuclear Theory, Coulomb barrier, Alpha particle, Breakup, Coincidence, Charged particle, Nuclear physics, Deuterium, Electric field, Atomic physics, Nuclear Experiment
Abstract: We have undertaken the study of 6 Li breakup on a 28 Si target near the Coulomb barrier through an angular distribution measurement. Alpha particles were recorded in coincidence with deuterons in order to determine exclusively the breakup of lithium. The results are analysed and are discussed, in a continuum discretized coupled channel framework (CDCC).
Published: 2006

10. Reaction channels of 6,7Li+28Si at near-barrier energies

Author: A. Spyrou, A. Gillibert, A. Pakou, A. Musumarra, N. G. Nicolis, M. Kokkoris, C. A. Papachristodoulou, Georgios Perdikakis, E. C. Pollacco, K. Rusek, G. Kalyva, Ch. Zarkadas, G. Doukelis, D. Pierroutsakou, A. Lagoyannis, and N. Alamanos
Subjects: Nuclear reaction, Physics, Nuclear and High Energy Physics, Angular distribution, Alpha particle, Atomic physics, Born approximation, Charged particle
Abstract: The production of α-particles in the reactions 6,7 Li+ 28 Si was studied as a means to disentangle the various reaction channels at near-barrier energies. The competition between compound and direct reactions was determined by using the shape of angular distributions and statistical model calculations. DWBA calculations were also performed to probe the various direct channels. It was found that, approaching barrier, transfer channels are the most dominant for both reactions. For 7 Li+ 28 Si d-transfer is one of the contributing channels without excluding t-transfer, while for 6 Li+ 28 Si, n-transfer and p-transfer have substantial contribution but without excluding d-transfer.
Published: 2005

11. Study of the effects of Pauli blocking and Pauli nonlocality on the optical potential

Author: N. Alamanos, M. A. G. Alvarez, Mahir S. Hussein, and Luiz Carlos Chamon
Subjects: Normalization (statistics), Physics, Elastic scattering, Nuclear and High Energy Physics, Nuclear Theory, Scattering, FOS: Physical sciences, Reduced mass, Nuclear Theory (nucl-th), symbols.namesake, Quantum nonlocality, Pauli exclusion principle, symbols, Nuclear Experiment (nucl-ex), Atomic physics, Nuclear Experiment, Nucleon, Absorption (electromagnetic radiation)
Abstract: Elastic scattering angular distributions for systems with reduced mass between 3 and 34 and energies varying between 25 and 120 MeV/nucleon were analyzed. The stable $^4$He, its exotic partner $^6$He, and the weakly bound $^{6,7}$Li nuclei were included as projectiles in the systematics. Optical model data analyzes were performed with an adjustable factor of normalization included in the imaginary part of the potential. These analyzes indicated a reduction of absorption for systems with small reduced masses that was detected due to the refractive nature of the scattering by light systems., Comment: 16 pages, 7 figures
Published: 2005

12. No enhancement of fusion probability by the neutron halo of 6He

Author: J. L. Sida, V. Lapoux, P. Figuera, S. Courtin, J. L. Charvet, Carmen Angulo, Alinka Lepine-Szily, S. Heinrich, L. Nalpas, J. M. Casandjian, C. Jouanne, A. Drouart, K. Rusek, D. Pierroutsakou, D. J. C. Durand, N. Alamanos, A. Gillibert, M. Romoli, M. Trotta, R. Raabe, A. Musumarra, 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), 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, Fusion, Multidisciplinary, Nuclear Theory, Coulomb barrier, Halo nucleus, Fission product yield, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear physics, medicine.anatomical_structure, medicine, Nuclear fusion, Neutron, Halo, Nuclear Experiment, Nucleus
Abstract: Quantum tunnelling through a potential barrier ( such as occurs in nuclear fusion) is very sensitive to the detailed structure of the system and its intrinsic degrees of freedom(1,2). A strong increase of the fusion probability has been observed for heavy deformed nuclei(3). In light exotic nuclei such as He-6, Li-11 and Be-11 ( termed 'halo' nuclei(4)), the neutron matter extends much further than the usual nuclear interaction scale. However, understanding the effect of the neutron halo on fusion has been controversial - it could induce a large enhancement of fusion(5), but alternatively the weak binding energy of the nuclei could inhibit the process(6). Other reaction channels known as direct processes ( usually negligible for ordinary nuclei) are also important: for example, a fragment of the halo nucleus could transfer to the target nucleus through a diminished potential barrier. Here we study the reactions of the halo nucleus He-6 with a U-238 target, at energies near the fusion barrier. Most of these reactions lead to fission of the system, which we use as an experimental signature to identify the contribution of the fusion and transfer channels to the total cross-section. At energies below the fusion barrier, we find no evidence for a substantial enhancement of fusion. Rather, the ( large) fission yield is due to a two-neutron transfer reaction, with other direct processes possibly also involved.
Published: 2004

13. The elastic scattering of 6Li+28Si at near-barrier energies

Author: E. C. Pollacco, K.G. Ioannides, N. G. Nicolis, M. Kokkoris, N. Alamanos, D. Karamanis, D. Pierroutsakou, A. Lagoyannis, Georgios Perdikakis, N. Patronis, D. Karadimos, A. Gillibert, E Kossionides, A. Pakou, G. Doukelis, P.A. Assimakopoulos, and C. A. Papachristodoulou
Subjects: Elastic scattering, Physics, Nuclear and High Energy Physics, Angular range, Measured σ(θ), Double-folding potentials, Elastic scattering 28Si(6Li, 6Li), Coulomb barrier, Weakly bound nuclei, Deduced optical model parameters, Sub-barrier fusion, Pseudo-modal energies, Threshold anomaly, Anomaly (physics), Atomic physics, Energy (signal processing)
Abstract: The 6 Li + 28 Si elastic scattering was studied at near-barrier energies with the aim to probe the threshold anomaly. Angular distributions were measured over a wide angular range (θlab = 25 ◦ to 150 ◦ ) at 4 energies, namely, 7.5, 9, 11 and 13 MeV. The present data together with previous ones at higher energies, as well as elastic scattering data of 6 Li on various targets at near barrier energies, were analyzed by using optical potentials obtained in a double-folding framework. It was found that the strength of the real part of the potential remains almost independent of energy down to, and possible even below, barrier, while the strength of the imaginary part presents an increase at near barrier energies. The results are discussed.  2003 Elsevier Science B.V. All rights reserved.
Published: 2003

14. 24.5 A MeV 6He+p elastic and inelastic scattering

Author: R. S. Slepnev, P. K. Deb, E. A. Kuzmin, K. Amos, V. A. Gorshkov, A. S. Fomichev, S. V. Stepantsov, Steven Karataglidis, D. D. Bogdanov, Isao Tanihata, F. Auger, Yu. Ts. Oganessian, G. M. Ter-Akopian, A. M. Rodin, S. I. Sidorchuk, N. Alamanos, M. L. Chelnokov, E. Yu. Nikolskii, R. Wolski, A.A. Korsheninnikov, G. Lobo, M. S. Golovkov, R.L Kavalov, and V. Lapoux
Subjects: Density matrix, Physics, Nuclear and High Energy Physics, Proton, Basis (linear algebra), Inverse kinematics, Excited state, Nuclear Theory, Inelastic scattering, Atomic physics, Optical potential, Beam (structure)
Abstract: The structure of 6 He is explored with proton elastic and inelastic scattering to the first 2 + excited state (Q =− 1. 8M eV) of 6 He in the inverse kinematics using a 24.5 A MeV 6 He beam. The distorted wave approximation (DWA) with an optical potential obtained by folding an effective nucleon–nucleon (NN) g-matrix with the 6 He density matrix elements as given by a large basis shell model is used to analyse the data. The comparison of predictions with the data confirms the view that 6 He has
Published: 2002

15. Surprises at theN=20 Shell Closure Far from Stability by Inelastic Scattering

Author: J. A. Scarpaci, N. Alamanos, A. Gillibert, V. Lapoux, C. Jouanne, W. Mittig, Z. Dlouhý, J. Mrazek, H. Savajols, F. Sarazin, P. Roussel-Chomaz, D. Baiborodin, E. C. Pollacco, S. M. Lukyanov, A. Drouart, J. M. Casandjian, C. E. Demonchy, A. V. Belozyorov, A. Korichi, and Y. E. Penionzhkevich
Subjects: Physics, education.field_of_study, Physics and Astronomy (miscellaneous), Population, Shell (structure), Closure (topology), Inelastic scattering, Stability (probability), Inelastic neutron scattering, Cross section (physics), medicine.anatomical_structure, medicine, Atomic physics, education, Nucleus
Abstract: Following mass-measurements in the region N = 20 and N = 28, we have studied inelastic nuclear scattering for the nuclei 3 4 Si, 3 3 Al and 3 2 Mg. No evidence for a low lying shape isomeric 0 + state was found in 3 4 Si,and an upper limit for the population cross section could be established, rendering it's existence very unlikely. A new transition was found in 3 3 Al, that is a good candidate for a 2p-2h state and therefore a determination of the 2p-2h gap at N = 20. Inelastic nuclear scattering strongly excites 3 - states, as seen in 3 4 Si. A strong transition was found in 3 2 Mg that should correspond to the first 3 - in this nucleus, lying very low as compared to theory and systematics in this region.
Published: 2002

16. Probing the 6He halo structure with elastic and inelastic proton scattering

Author: K. Amos, P. Roussel-Chomaz, S. Karataglidis, A. Pakou, A. Musumarra, T. Suomijärvi, Elias Khan, J. L. Sida, V. Lapoux, A. Gillibert, D. Pierroutsakou, A. Drouart, Y. Blumenfeld, M. La Commara, A Lagoyannis, M. Sandoli, Wolfgang Mittig, J.A. Scarpaci, E. C. Pollacco, N. Alamanos, F. Auger, G. Fioni, M. Romoli, S. Ottini-Hustache, D. Santonocito, F. Braga, A., Lagoyanni, F., Auger, A., Musumarra, N., Alamano, E. C., Pollacco, A., Pakou, Y., Blumenfeld, F., Braga, LA COMMARA, Marco, A., Drouart, G., Fioni, A., Gillibert, E., Khan, V., Lapoux, W., Mittig, S., Ottini Hustache, D., Pierroutsakou, M., Romoli, P., Roussel Chomaz, M., Sandoli, D., Santonocito, J. A., Scarpaci, J. L., Sida, T., Suomijärvi, S., Karataglidi, K., Amos, 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), 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 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 and High Energy Physics, unstable nuclei, Proton, shell-model, Nuclear Theory, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Inelastic scattering, 01 natural sciences, Molecular physics, microscopic model analyses, 0103 physical sciences, li-11, optical model, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, Wave function, Elastic scattering, Physics, 010308 nuclear & particles physics, Scattering, diverse mass, excitations, light-nuclei, Excited state, proton scattering, targets, Physics::Accelerator Physics, Halo, Beam (structure), energy
Abstract: Proton elastic scattering and inelastic scattering to the first excited state of 6He have been measured over a wide angular range using a 40.9A MeV 6He beam. The data have been analyzed with a fully microscopic model of proton-nucleus scattering using 6He wave functions generated from large space shell model calculations. The inelastic scattering data show a remarkable sensitivity to the halo structure of 6He., Comment: 9 pages, 3 figures. RevTeX. Replaced figure 3 with updated figure
Published: 2001

17. A determination of the interaction potential

Author: W. Mittig, A. de Vismes, A. Musumarra, N. K. Skobelev, F. Sarazin, W. N. Catford, A. Gillibert, V. Lapoux, N. Alamanos, P. Roussel-Chomaz, S. Ottini-Hustache, H. Savajols, A.V. Belozyorov, Alinka Lepine-Szily, F. Marie, A. Pakou, N. A. Orr, C. Borcea, F. Auger, J. Barrette, J. C. Angélique, M. D. Cortina-Gil, S. M. Lukyanov, F. de Oliveira, Z. Dlouhy, and Y. E. Penionzhkevich
Subjects: Physics, Nuclear and High Energy Physics, Hydrogen, 010308 nuclear & particles physics, chemistry.chemical_element, Halo nucleus, 01 natural sciences, 7. Clean energy, Cross section (physics), Interaction potential, Density distribution, chemistry, 0103 physical sciences, Transmission method, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Charge exchange
Abstract: The reaction cross section for the halo nucleus 6 He on hydrogen has been measured at 36 MeV/nucleon using the transmission method and a value of σ R =409±22 mb was obtained. A coherent analysis within a microscopic model of this result in conjunction with (p,p) and (p,n) angular distributions has allowed the interaction potential to be uniquely determined. This analysis also allowed the 6 He density distribution to be explored.
Published: 2001

18. Inelastic proton scattering as a mean for the determination of neutron and proton matrix element ratios

Author: A. Lagoyannis, N. Alamanos, A. Pakou, and A. Musumarra
Subjects: macroscopic calculations, Nuclear and High Energy Physics, nuclear-structure, Proton, neutron matrix element, Nuclear Theory, proton matrix element, Neutron scattering, Inelastic scattering, microscopic calculations, Inelastic neutron scattering, transition densities, elastic proton scattering, isoscalar, elastic-scattering, Neutron, Nuclear Experiment, inelastic proton scattering, Physics, Elastic scattering, ca-48, Scattering, excitation, Small-angle neutron scattering, electron-scattering, Atomic physics
Abstract: The determination of ratio of neutron over proton matrix elements by inelastic proton scattering, for 0(+)-->2(+) transitions, is investigated via the comparison between experimental data and theoretical calculations. Calculations into the context of a macroscopic and a microscopic description are performed for a wide mass range nuclei: O-18, Si-30, S-32,S-34, Ca-48, Sr-88, for which these ratios were determined previously with an independent technique. At that point the choice of the theoretical model may be very critical, It is thus the purpose of this investigation to point out the most suitable model. It is found that in general both theoretical models can be employed for the reliable determination of neutron over proton matrix element ratios. (C) 1999 Elsevier Science B.V. All rights reserved. Nuclear Physics A
Published: 1999

19. Impact parameter dependence of linear momentum transfer and the role of two-body dissipation mechanisms in heavy ion collisions around the Fermi energy

Author: R. Coniglione, C. Agodi, G. Bellia, Y. Blumenfeld, R. Alba, Paolo Piattelli, T. Suomijärvi, Paolo Finocchiaro, K. Loukachine, N. Frascaria, A. Del Zoppo, J.H. Le Faou, F. Auger, Paolo Sapienza, Domenico Santonocito, N. Alamanos, Maria Colonna, J.A. Scarpaci, Ph. Chomaz, A. Gillibert, J.C. Roynette, E. Migneco, C. Maiolino, 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), Robert, Suzanne, 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, High energy, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], 010308 nuclear & particles physics, Nuclear Theory, Fermi energy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Dissipation, 01 natural sciences, 7. Clean energy, Coincidence, Nuclear physics, 0103 physical sciences, Transfer mechanism, Heavy ion, Impact parameter, Atomic physics, Multiplicity (chemistry), Nuclear Experiment, 010306 general physics
Abstract: High energy γ -rays ( E γ >35 MeV) have been measured in coincidence with heavy residues emitted in reactions induced by a 37 MeV/u 36 Ar beam on a 98 Mo target. The γ -ray yield increases strongly with increasing linear momentum transfer indicating the importance of two-body collisions in the transfer mechanism. The high energy γ -ray multiplicity has been used to correlate the linear momentum transfer to the impact parameter. This correlation is compared to dynamical BNV simulations to show the essential role of two body nucleon-nucleon collisions at these bombarding energies.
Published: 1998

20. Compound nuclear lifetimes at high excitation energies via a new statistical fluctuation method

Author: Marielle Chartier, J. M. Casandjian, D. Cortina-Gil, A. Ostrowski, A. Lépine, M. MacCormick, G. Auger, P. Roussel-Chomaz, A. Gillibert, F. Auger, A. Pakou, V. Fekou-Youmbi, B. Fernandez, N. Alamanos, W. Mittig, and J. L. Sida
Subjects: Physics, Nuclear and High Energy Physics, medicine.anatomical_structure, medicine, Statistical model, Alpha particle, Atomic physics, Nucleus, Excitation, Spectral line, Coherence (physics)
Abstract: A new method to determine compound nuclear lifetimes at high excitation energies is proposed and applied to the system 12 C( 28 Si, α ) 36 Ar at two different bombarding energies, 190 and 277 MeV. The alpha particle spectra show a structure which directly reflects the fluctuating behavior of the first de-excitation step. Coherence widths and thus lifetimes for the nucleus 36 Ar were obtained via a correlation function analysis. The results at low excitation energies are consistent with standard statistical models while the result at high excitation energy is compatible with a theoretically predicted change of the level density parameter.
Published: 1998

21. Search for the signature of a halo structure in the p(6He, 6Li)n reaction

Author: Alinka Lepine-Szily, V. Pascalon, N. Alamanos, B. Fernandez, N. A. Orr, H. Laurent, N. Frascaria, J. Barrette, A. Gillibert, J. A. Scarpaci, J. M. Casandjian, Y. Blumenfeld, P. Roussel-Chomaz, W. Mittig, F. Auger, M.D. Cortina-Gil, V. Fekou-Youmbi, Marielle Chartier, T. Suomijärvi, J. L. Sida, 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), 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), 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), 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: Elastic scattering, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Exchange interaction, Relative strength, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Cross section (physics), 0103 physical sciences, Isobaric process, Halo, Atomic physics, Nuclear Experiment, 010306 general physics, Ground state, Nuclear Physics, Fermi Gamma-ray Space Telescope
Abstract: The elastic scattering p( 6 He, 6 He)p and charge exchange reaction p( 6 He, 6 Li)n have been measured in reverse kinematics with a secondary 6 He beam. The angular distributions for these reactions were obtained. In the case of the charge exchange reaction, the ratio of the cross section for the Gamow-Teller transition to the ground state, and for the Fermi transition to the isobaric analog state is a measure of the relative strength of the two components of the exchange interaction, V στ and V τ . This ratio is found to be compatible with existing systematics for stable T = 1 nuclei, and no clear signature of a halo structure was found in the present data.
Published: 1996

22. The Giant Dipole Resonance at very high temperatures

Author: J.C. Roynette, Ph. Chomaz, K. Loukachine, T. Suomijärvi, G. V. Russo, Paolo Piattelli, N. Frascaria, J.H. Le Faou, A. Del Zoppo, A. Gillibert, E. Migneco, J.P. Garron, G. Bellia, Paolo Finocchiaro, Domenico Santonocito, C. Agodi, F. Auger, C. Maiolino, J.A. Scarpaci, J. J. Gaardhøje, R. Liguori-Neto, R. Alba, Paolo Sapienza, N. Alamanos, R. Coniglione, S. Montironi, Augusto Smerzi, M. Lamehi-Rachti, Y. Blumenfeld, 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), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Evaporation, Resonance, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Dipole, Yield (chemistry), 0103 physical sciences, Physics::Accelerator Physics, Astrophysics::Solar and Stellar Astrophysics, Atomic physics, Nuclear Experiment, 010306 general physics, ComputingMilieux_MISCELLANEOUS, Excitation
Abstract: Gamma-rays emitted from hot nuclei of mass around 115 and excitation energies above 300 MeV, formed in the 36 Ar + 90 Zr at 27 MeV/u, 36 Ar + 94 Zr at 32 MeV/u and 36 Ar + 98 Mo at 37 MeV/u, have been measured with the MEDEA multidetector in coincidence with evaporation residues. The γ-ray yield from the decay of the Giant Dipole Resonance is independent of excitation energy and of bombarding energy.
Published: 1995

23. Kaon production in nucleus - nucleus collisions at 92 MeV per nucleon

Author: J. L. Sida, D. Lebrun, L. Bianchi, P. de Saintignon, P. Hameau, J.P. Wieleczko, J. Julien, N. Alamanos, J.F. Lecolley, G. Perrin, H. Dabrowski, A. Mougeot, C. Le Brun, Y. Cassagnou, R. Legrain, F.R. Lecolley, and B. Erazmus
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson production, Muon, Nuclear Theory, Nuclear physics, medicine.anatomical_structure, Available energy, medicine, Coulomb, Incident energy, High Energy Physics::Experiment, Center of mass, Nuclear Experiment, Nucleon, Nucleus
Abstract: The cross sections for K + meson production in collisions of 36 Ar on 12 C, nat Ti and 181 Ta at an incident energy of 92 MeV per nucleon have been measured. A description of the set-up and of the method is given ; it is based on measurement of the muon decay of the positive kaon. At such a low incident energy the K + production seems to be more sensitive to the available energy in the center of mass of the nucleus-nucleus system than to the coulomb corrected incident energy normalized to the production threshold in a free nucleon-nucleon process.
Published: 1995

24. New excited states in the halo nucleus 6He

Author: K. Rusek, L. Gaudefroy, J. A. Scarpaci, T. J. Mertzimekis, E. C. Pollacco, V. Lapoux, A. Drouart, Jérôme Guillot, B. Avez, Xavier Mougeot, Daisuke Suzuki, N. Keeley, P. Roussel-Chomaz, I. Strojek, N. Alamanos, Hironori Iwasaki, Cedric Simenel, A. Pakou, D. Beaumel, C. Force, L. Nalpas, R. Dayras, W. Mittig, R. Wolski, F. Auger, T. Roger, K. W. Kemper, Y. Blumenfeld, T. Al Kalanee, A. Gillibert, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), 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), 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, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Resonant states, Halo nucleus, He 8 ( p , t ), Transfer reaction, Astrophysics::Cosmology and Extragalactic Astrophysics, Borromean nucleus, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Charged particle, law.invention, Telescope, 8He(p, law, Excited state, 0103 physical sciences, Atomic physics, t), 010306 general physics, Spectroscopy, Nuclear Experiment, Excitation
Abstract: Expérience GANIL/SPIRAL/MUST2/E525S; The low-lying spectroscopy of 6He was investigated via the 2-neutron transfer reaction p(8He, t) with the 8He beam delivered by the SPIRAL facility at 15.4 A MeV. The light charged particles produced by the direct reactions were measured using the MUST2 Si-strip telescope array. Above the known 2+ state, two new resonances were observed: at E∗ = 2.6±0.3 MeV (width Γ = 1.6±0.4 MeV) and at 5.3±0.3 MeV with Γ = 2 ± 1 MeV. Through the analysis of the angular distributions, they correspond to a 2+ state and to an L = 1 state, respectively. These new states, challenging the nuclear theories, could be used as benchmarks for checking the microscopic inputs of the newly improved structure models, and should trigger development of models including the treatments of both core excitation and continuum coupling effects.
Published: 2012

25. NEW DETECTOR SYSTEM FOR SUPER HEAVY ELEMENTS DETECTION

Author: N. Alamanos, A. Wieloch, Louise Stuttge, M. Adamczyk, Francis Hanappe, J. Błocki, Tomasz Kozik, P. Bańka, M. Kisielewski, M. Kowalczyk, A. Gillibert, W. Gawlikowicz, Jean Péter, A. Khouaja, F. Hannachi, E. Piasecki, Ch. Vandamme, L. Manduci, K. Łojek, S. Grévy, R. Hue, A. Drouart, F. de Oliveira Santos, G. Politi, P. Lasko, J.P. Wieleczko, Ch. Stodel, A. Lopez-Martens, A.J. Kordyasz, R. Dayras, Ł. Zosiak, Zbigniew Sosin, Benoît Avez, M. G. Saint-Laurent, Anna Gonciarz, A. Trzcińska, 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 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), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), 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)-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), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM)
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Fission, Fermium, Detector, Cyclotron, General Physics and Astronomy, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Particle detector, law.invention, Nuclear physics, chemistry, law, 0103 physical sciences, 010306 general physics, Radioactive decay, Spontaneous fission
Abstract: A new detector system dedicated for very/super heavy elements (VHE/SHE) detection that decay by spontaneous fission is presented. Such a decay mode of nuclei can be found e.g. in the region of Z ≈100 (Fermium). Future experiments realized in the frame of French-Polish collaboration at the cyclotrons in GANIL and in the Heavy Ion Laboratory (HIL), University of Warsaw, is described. The results of test measurements made in the HIL for reactions 20 Ne (8 A . MeV )+120 Sn , 179 Au are presented.
Published: 2010

26. Total reaction and fusion cross sections at sub- and near-barrier energies for the system Li-7+Si-28

Author: A. Musumarra, A. Lagoyannis, K. Rusek, A. Pakou, D. Roubos, T. J. Mertzimekis, M. Kokkoris, N. G. Nicolis, D. Pierroutsakou, X. Aslanoglou, and N. Alamanos
Subjects: Nuclear reaction, Physics, Nuclear and High Energy Physics, Fusion, optical-model, Context (language use), li-6, Cross section (physics), mg-26, nuclei, threshold, Nuclear fusion, Neutron, Nuclear cross section, elastic-scattering, Atomic physics, Dimensionless quantity
Abstract: Fusion cross sections are extracted for the (7)Li + (28)Si system, via reaction cross section and transfer measurements at sub- and near-barrier energies (E(lab) = 5.7 to 14 MeV). The energy evolution of transfer to reaction cross section ratios is determined with the aid of CDCC calculations, which subsequently allows the deduction of fusion cross sections at sub- and near-barrier energies. It is shown that fusion can be well represented in a BPM context. Fusion cross sections are compared for the systems (7)Li + (28)Si and (6)Li + (28)Si, the latter studied previously, and are found to exhibit different strengths. Last, the direct channels determined at 13 MeV, are found to be dominated by a 2n-transfer mechanism. European Physical Journal A
Published: 2009

27. Elastic backscattering measurements for Li6+Si28 at sub- and near-barrier energies

Author: K. Zerva, N. Patronis, A. Pakou, N. Alamanos, X. Aslanoglou, D. Filipescu, T. Glodariu, M. Kokkoris, A. Lagoyannis, M. Mazzocco, N. Nicolis, D. Pierroutsakou, M. Romoli, K. Rusek, LA COMMARA, MARCO, K., Zerva, N., Patroni, A., Pakou, N., Alamano, X., Aslanoglou, D., Filipescu, T., Glodariu, M., Kokkori, LA COMMARA, Marco, A., Lagoyanni, M., Mazzocco, N., Nicoli, D., Pierroutsakou, M., Romoli, and K., Rusek
Published: 2009

28. Fusion and Direct Reactions of Halo Nuclei at Energies around the Coulomb Barrier

Author: J. L. Sida, Riccardo Raabe, N. Alamanos, and N. Keeley
Subjects: Elastic scattering, Coupling, Physics, Nuclear and High Energy Physics, Fusion, FOS: Physical sciences, Coulomb barrier, Breakup, Nuclear physics, Neutron, Direct reaction, Halo, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract: The present understanding of reaction processes involving light unstable nuclei at energies around the Coulomb barrier is reviewed. The effect of coupling to direct reaction channels on elastic scattering and fusion is investigated, with the focus on halo nuclei. A list of definitions of processes is given, followed by a review of the experimental and theoretical tools and information presently available. The effect of couplings on elastic scattering and fusion is studied with a series of model calculations within the coupled-channels framework. The experimental data on fusion are compared to "bare" no-coupling one-dimensional barrier penetration model calculations. On the basis of these calculations and comparisons with experimental data, conclusions are drawn from the observation of recurring features. The total fusion cross sections for halo nuclei show a suppression with respect to the "bare" calculations at energies just above the barrier that is probably due to single neutron transfer reactions. The data for total fusion are also consistent with a possible sub-barrier enhancement; however, this observation is not conclusive and other couplings besides the single-neutron channels would be needed in order to explain any actual enhancement. We find that a characteristic feature of halo nuclei is the dominance of direct reactions over fusion at near and sub-barrier energies; the main part of the cross section is related to neutron transfers, while calculations indicate only a modest contribution from the breakup process., 52 pages, review paper, accepted for publication in "Progress in Particle and Nuclear Physics"
Published: 2007

29. (6,)7Li+Si-28 total reaction cross sections at near barrier energies

Author: K. Rusek, Sotirios Harissopulos, N. Alamanos, N. G. Nicolis, A. Pakou, Ch. Zarkadas, G. Doukelis, M. Kokkoris, G. Kalyva, A. Lagoyannis, S. Spyrou, A. Gillibert, P.A. Assimakopoulos, D. Pierroutsakou, G. Perdikakis, T. J. Mertzimekis, D. Roubos, A. Musumarra, C. A. Papachristodoulou, and N. Divis
Subjects: Physics, Elastic scattering, Nuclear reaction, Nuclear and High Energy Physics, Scattering, deduced potential anomaly features, Isotopes of lithium, nuclear reactions si-28(li-6,x), (li-7,x), e=8-13 mev, li-6, breakup, he-6, measured reaction sigma, bi-209, Cross section (physics), fusion reactions, comparison with previous results and model predictions, nuclei, elastic-scattering, Nuclear cross section, Isotopes of silicon, Atomic physics, Anomaly (physics), coulomb barrier
Abstract: Total reaction cross section measurements for the Li-6,Li-7 + Si-28 systems have been performed at near-barrier energies. The results indicate that, with respect to the potential anomaly at barrier, Li-6 and Li-7 on light targets exhibit similar energy dependence on the imaginary potential. Comparisons are made with Li-6,Li-7 cross sections on light and heavy targets, extracted via previous elastic scattering measurements and also with CDCC calculations. Energy dependent parametfisations are also obtained for total reaction cross sections of Li-6,Li-7 on Si, as well as on any target, at near barrier energies. (c) 2006 Elsevier B.V. All rights reserved. Nuclear Physics A
Published: 2007

30. γ spectroscopy ofNe25,27andNa26,27

Author: A. Obertelli, A. Gillibert, N. Alamanos, M. A. G. Alvarez, F. Auger, R. Dayras, A. Drouart, N. Keeley, V. Lapoux, X. Mougeot, L. Nalpas, E. Pollacco, F. Skaza, Ch. Theisen, G. de France, B. Jurado, W. Mittig, F. Rejmund, M. Rejmund, P. Roussel-Chomaz, H. Savajols, A. Pakou, and N. Patronis
Subjects: Physics, Nuclear and High Energy Physics, Inverse kinematics, 010308 nuclear & particles physics, Nuclear Theory, Space (mathematics), 01 natural sciences, 3. Good health, Deuterium, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Selectivity, Spectroscopy, Astrophysics::Galaxy Astrophysics
Abstract: The $\gamma$ spectroscopy of $^{25,27}$Ne and $^{26,27}$Na was studied from the reaction of $^{26}$Ne with a deuterium target in inverse kinematics at 9.7 MeV/nucleon. The selectivity of the (d,p),(d,t), and (d,n) transfer reactions provides new spectroscopic information on low-lying states. The validity of the sd shell-model space for these nuclei is discussed.
Published: 2006

31. Structure of exotic nuclei from direct reactions

Author: A. Gillibert, N. Alamanos, M. Alvarez, F. Auger, D. Beaumel, E. Becheva, Y. Blumenfeld, R. Dayras, F. Delaunay, A. Drouart, G. de France, L. Giot, B. Jurado, N. Keeley, K.W. Kemper, V. Lapoux, W. Mittig, X. Mougeot, L. Nalpas, A. Obertelli, N. Patronis, A. Pakou, E.C. Pollacco, R. Raabe, P. Roussel-Chomaz, F. Rejmund, M. Rejmund, H. Savajols, J.A. Scarpaci, J.L. Sida, F. Skaza, S. Stepantsov, Ch. Theisen, R. Wolski, Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Bertulani C.A., Gomes P.R.S., Hussein M.S., Szanto de Toledo A., SPIRAL, and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, shell-model, 0103 physical sciences, SHELL model, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences
Abstract: A. Gillibert, N. Alamanos, M. Alvarez, F. Auger, D. Beaumel, E. Becheva, Y. Blumenfeld, R. Dayras, F. Delaunay, A. Drouart, G. de France, L. Giot, B. Jurado, N. Keeleya∗ , K.W. Kemper, V. Lapoux, W. Mittig, X. Mougeot, L. Nalpas, A. Obertelli, N. Patronis, A. Pakou, E.C. Pollacco, R. Raabe, P. Roussel-Chomaz, F. Rejmund, M. Rejmund, H. Savajols, J.A. Scarpaci , J.L. Sida, F. Skaza, S. Stepantsov , Ch. Theisen and R. Wolski DAPNIA/SPhN, CE Saclay, 91191 Gif-sur-Yvette, France Institut de Physique Nucleaire, 91406 Orsay ,France GANIL, BP 5027, 14021 Caen Cedex, France Department of Physics, Florida State University, Florida 32306-4350 USA University of Ioannina, 45110 Ioannina, Greece JINR,FLNR 141980 Dubna, Russia The Henryk Niewodniczanski Institute of Nuclear Physics, Krakow, Poland
Published: 2006

32. Radial sensitivity of elastic scattering at near barrier energies for weakly bound and tightly bound nuclei

Author: K. Rusek, A. Pakou, N. Alamanos, and D. Roubos
Subjects: Elastic scattering, Physics, Nuclear reaction, Nuclear and High Energy Physics, Scattering, Carbon-12, Coulomb barrier, o-16, c-12, li-6, ions, pb-208, Woods–Saxon potential, Sensitivity (control systems), Atomic physics, coulomb barrier, Oxygen-16
Abstract: The radial sensitivity of elastic scattering for weakly bound ($^{6}\mathrm{Li}$, $^{7}\mathrm{Li}$, $^{9}\mathrm{Be}$) and tightly bound projectiles ($^{12}\mathrm{C}$, $^{16}\mathrm{O}$) on light and heavy targets ($^{28}\mathrm{Si}$, $^{58}\mathrm{Ni}$, $^{118}\mathrm{Sn}$, $^{208}\mathrm{Pb}$, $^{209}\mathrm{Bi}$) is sought at barrier energies, taking into account a Woods -Saxon potential and a BDM3Y1 interaction. The results are discussed in terms of the potential anomaly at the coulomb barrier.
Published: 2006

33. Experimental evidence for subshell closure inHe8and indication of a resonant state inHe7below 1 MeV

Author: D. Beaumel, J.A. Scarpaci, Lydie Giot, J. L. Sida, F. Skaza, R. Raabe, A. Drouart, K. W. Kemper, F. Delaunay, F. Auger, A. Gillibert, Y. Blumenfeld, R. Wolski, S. V. Stepantsov, E. C. Pollacco, N. Alamanos, A. Pakou, N. Keeley, A. Obertelli, V. Lapoux, L. Nalpas, P. Roussel-Chomaz, and E. Becheva
Subjects: Nuclear reaction, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Hadron, Elementary particle, 01 natural sciences, Nuclear physics, Excited state, 0103 physical sciences, Born approximation, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Isotopes of helium, Dimensionless quantity
Abstract: The spectroscopy of the unstable $^{8}\mathrm{He}$ and unbound $^{7}\mathrm{He}$ nuclei is investigated via the $p(^{8}\mathrm{He}$, d) transfer reaction with a 15.7A MeV $^{8}\mathrm{He}$ beam from the SPIRAL facility. The emitted deuterons were detected by the telescope array MUST. The results are analyzed within the coupled-channels Born approximation framework, and a spectroscopic factor ${C}^{2}S=4.4\ifmmode\pm\else\textpm\fi{}1.3$ for neutron pickup to the ${}^{7}{\mathrm{He}}_{g.s.}$ is deduced. This value is consistent with a full p3/2 subshell for $^{8}\mathrm{He}$. Tentative evidence for the first excited state of $^{7}\mathrm{He}$ is found at E${}^{*}=0.9\ifmmode\pm\else\textpm\fi{}0.5$ MeV (width $\ensuremath{\Gamma}=1.0\ifmmode\pm\else\textpm\fi{}0.9$ MeV). The second one is observed at a position compatible with previous measurements, E${}^{*}=2.9\ifmmode\pm\else\textpm\fi{}0.1$ MeV. Both are in agreement with previous separate measurements. The reproduction of the first excited state below 1 MeV would be a challenge for the most sophisticated nuclear theories.
Published: 2006

34. Structure of low-lying states ofC10,11from proton elastic and inelastic scattering

Author: G. Lobo, T. Zerguerras, N. Alamanos, C. Jouanne, Elias Khan, T. Suomijärvi, A. Musumarra, E. C. Pollacco, A. Gillibert, V. Lapoux, H. Savajols, A. Drouart, L. Nalpas, P. Roussel-Chomaz, F. Auger, A. Lagoyannis, Y. Blumenfeld, A. Pakou, J. L. Sida, and M. Trotta
Subjects: Elastic scattering, Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Nuclear structure, Inelastic scattering, 01 natural sciences, Excited state, 0103 physical sciences, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Ground state, Nucleon
Abstract: To probe the ground state and transition densities, elastic and inelastic scattering on a proton target were measured in inverse kinematics for the unstable $^{10}\mathrm{C}$ and $^{11}\mathrm{C}$ nuclei at 45.3 and 40.6 MeV/nucleon, respectively. The detection of the recoil proton was performed by the MUST telescope array, in coincidence with a wall of scintillators for the quasiprojectile. The differential cross sections for elastic and inelastic scattering to the first excited states are compared to the optical model calculations performed within the framework of the microscopic nucleon-nucleus Jeukenne-Lejeune-Mahaux potential. Elastic scattering is sensitive to the matter-root-mean square radius found to be $2.42\ifmmode\pm\else\textpm\fi{}0.1$ and $2.33\ifmmode\pm\else\textpm\fi{}0.1$ fm, for $^{10,11}\mathrm{C}$, respectively. The transition densities from cluster and mean-field models are tested, and the cluster model predicts the correct order of magnitude of cross sections for the transitions of both isotopes. Using the Bohr-Mottelson prescription, a profile for the $^{10}\mathrm{C}$ transition density from the ${0}^{+}$ ground to the ${2}_{1}^{+}$ state is deduced from the data. The corresponding neutron transition matrix element is extracted: ${M}_{n}=5.51\ifmmode\pm\else\textpm\fi{}1.09$ fm${}^{2}$.
Published: 2005

35. Investigation ofHe6cluster structures

Author: K. Rusek, V. Lapoux, R.S. Mackintosh, H. Savajols, S. V. Stepantsov, A. Pakou, J. Fernandez-Vasquez, W. Mittig, F. Auger, M. D. Cortina-Gil, Ian J. Thompson, F. Skaza, N. Alamanos, A. M. Rodin, E. C. Pollacco, R. Wolski, L. Nalpas, C. Jouanne, C. E. Demonchy, L. Giot, S. Pita, J. L. Sida, P. Roussel-Chomaz, A. Gillibert, and G. M. Ter Akopian
Subjects: Elastic scattering, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Polarization (waves), 01 natural sciences, 0103 physical sciences, Cluster (physics), Neutron, Atomic physics, Born approximation, Nuclear Experiment, 010306 general physics, Ground state
Abstract: The $\ensuremath{\alpha}+2n$ and $t+t$ clustering of the $^{6}\mathrm{He}$ ground state were investigated by means of the transfer reaction $^{6}\mathrm{He}(p,t)^{4}\mathrm{He}$ at 25 MeV/nucleon. The experiment was performed in inverse kinematics at GANIL with the SPEG spectrometer coupled to the MUST array. Experimental data for the transfer reaction were analyzed by a distorted wave Born approximation (DWBA) calculation, including the two neutrons and the triton transfer. The couplings to the $^{6}\mathrm{He}\ensuremath{\rightarrow}^{4}\mathrm{He}+2n$ breakup channels were taken into account with a polarization potential deduced from a coupled-discretized-continuum channels analysis of the $^{6}\mathrm{He}+^{1}\mathrm{H}$ elastic scattering measured at the same time. The influence on the calculations of the $\ensuremath{\alpha}+t$ exit potential and of the triton sequential transfer is discussed. The final calculation gives a spectroscopic factor close to one for the $\ensuremath{\alpha}+2n$ configuration as expected. The spectroscopic factor obtained for the $t+t$ configuration is much smaller than the theoretical predictions.
Published: 2005

36. Selected Topics in Reaction Studies with Exotic Nuclei

Author: N. Alamanos and Alain Gillibert
Subjects: Nuclear physics, Physics, Fusion, Particle physics, Nuclear Theory, Inelastic scattering, Nuclear Experiment
Abstract: Recent results on the elastic and inelastic scattering of exotic nuclei by protons and complex nuclei are presented. The models used to analyze these data and the information that may be obtained from these analyses are described in some detail. Some results for transfer reactions and fusion induced by exotic nuclei are also briefly discussed.
Published: 2004

37. Pre-equilibrium dipole strength excitation in dissipative heavy-ion collisions

Author: M. Sandoli, F. Auger, F. Rizzo, M. Papa, A. Gillibert, N. Alamanos, A. D'Onofrio, Filippo Terrasi, F. Amorini, E. Fioretto, G. Inglima, L. Campajola, Lucio Gialanella, J.P.S. Van Shagen, A. Di Pietro, A. Ordine, D. Prosperi, D. Pierroutsakou, G. Cardella, V. Roca, Giuseppe Pappalardo, M. Romoli, A. de Rosa, M. La Commara, R. Croce, Mario R. Romano, G. de Angelis, and A. Musumarra
Subjects: Physics, Nuclear and High Energy Physics, Dipole, Dissipative system, Heavy ion, Atomic physics, Excitation
Published: 1995

38. Evidences for resonances states in $^{5}$H

Author: A. M. Rodin, A. S. Fomichev, S. K. Grishechkin, Yu. I. Vinogradov, M. G. Itkis, S. V. Zlatoustovskiy, N. Alamanos, F. Hanappe, A. M. Demin, A. A. Yukhimchuk, G.M. Ter-Akopian, A. V. Kuryakin, Alain Ninane, Yu. Ts. Oganessian, A.A. Korsheninnikov, M. S. Golovkov, E. M. Kozulin, A. A. Bogatchev, E. C. Pollacco, E. Yu. Nikolskii, M. L. Chelnokov, S. V. Stepantsov, R.I Il'kayev, L. Nalpas, V. V. Perevozchikov, I. V. Korzyukov, N. A. Kondratiev, P. Roussel-Chomaz, R. Wolski, Th. Materna, V. Lapoux, L. Stuttge, W. Mittig, R. S. Slepnev, Isao Tanihata, V. A. Gorshkov, S. I. Sidorchuk, S. V. Filchagin, D. D. Bogdanov, Grand Accélérateur National d'Ions Lourds (GANIL), 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: Triple coincidence, Physics, Nuclear and High Energy Physics, Proton, Nuclear Theory, Two-neutron transfer reaction, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Resonance (particle physics), Physique atomique et nucléaire, Nuclear physics, Mass spectrum, Physics::Accelerator Physics, Neutron, Tritium, Tritium target, Atomic physics, Tritium beam, Nuclear Experiment, Beam (structure)
Abstract: Resonance states of 5H were investigated through the two-neutron transfer reaction t(t, p)5 H. A triton beam at 57.5 MeV and a cryogenic liquid tritium target were used. The 5H missing mass spectrum in triple coincidence, proton + triton + neutron, shows a resonance at 1.8 ± 0.1 MeV above the t + 2n decay threshold. This energy is in good agreement with the result reported in Phys. Rev. Lett. 87 (2001) 092501. The resonance width, Γintr ≤ 0.5 MeV, is surprisingly small and difficult to reconcile with theory predictions. © 2003 Published by Elsevier B.V., SCOPUS: ar.j, info:eu-repo/semantics/published
Published: 2003

39. Structure of $^{10}$C and $^11}$C from elastic and inelastic scattering on a proton target

Author: A. Gillibert, A. Drouart, T. Zerguerras, E. Khan, Y. Blumenfeld, F. Auger, G. Lobo, A. Pakou, T. Suomijarvi, E. C. Pollacco, A. Lagoyannis, J. L. Sida, N. Alamanos, C. Jouanne, P. Roussel-Chomaz, A. Musumarra, L. Nalpas, V. Lapoux, H. Savajols, Robert, Suzanne, Institut de Physique Nucléaire d'Orsay (IPNO), 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: Elastic scattering, Physics, Nuclear and High Energy Physics, Quasielastic scattering, endocrine system, 010308 nuclear & particles physics, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Dynamic structure factor, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Inelastic scattering, Neutron scattering, Deep inelastic scattering, 01 natural sciences, Atomic and Molecular Physics, and Optics, 0103 physical sciences, Quasielastic neutron scattering, nuclei, Scattering theory, Atomic physics, Nuclear Experiment, 010306 general physics, isotopes, hormones, hormone substitutes, and hormone antagonists
Abstract: We measured elastic and inelastic scattering to the low-lying states of C-10 and C-11 isotopes oil a proton target with respective incident energies 45.3 and 40.6 A MeV. Data are analyzed with a microscopic complex potential. Elastic data are sensitive to the rms matter radius, which has been deduced for both isotopes. The moment of the neutron transition density was deduced for C-10 from inelastic scattering. (C) 2003 MAIK "Nauka/Interperiodica". Physics of Atomic Nuclei
Published: 2003

40. Structure of light exotic nuclei $^{6,8}$He and $^{10,11}$C from (p,p') reactions

Author: J.A. Scarpaci, F. Delaunay, A. Gillibert, P. Navràtif, C. Jouanne, A. Pakou, T. Zerguerras, A. Musumarra, D. Beaumel, R. Raabe, A. Obertelli, L. Giot, F. Skaza, R. Wolski, S. V. Stepantsov, P. Roussel-Chomaz, V. Lapoux, E. Becheva, L. Nalpas, H. Savajols, F. Auger, A. Drouart, Elias Khan, J. L. Sida, N. Alamanos, A. Lagoyannis, E. C. Pollacco, G. Lobo, Y. Blumenfeld, Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), 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 Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, 0103 physical sciences, Detector, Structure (category theory), Atomic physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, Nucleon, 7. Clean energy, 01 natural sciences, Spiral
Abstract: The structure of the light unstable nuclei 10,11 C and 6,8 He is investigated by means of (p,p′) reactions. The experiments were performed at GANIL using the MUST detector, an array of Si and SiLi telescopes. The (p,p′) are analyzed within the framework of the microscopic JLM potential, allowing to test the densities predicted by structure models. Preliminary data from the 8 He(p,o′) reaction performed at the SPIRAL facility at 15.6 MeV/nucleon are discussed.
Published: 2002

41. Coupling effects in the elastic scattering of6Heon12C

Author: T. Suomijärvi, V. Lapoux, J.A. Scarpaci, P. Roussel-Chomaz, F. de Oliveira Santos, A. Gillibert, N. A. Orr, Alexander Ostrowski, J. H. Kelley, F. Maréchal, N. Alamanos, Dao T. Khoa, S. Ottini-Hustache, W. Mittig, Marielle Chartier, F. Auger, Y. Blumenfeld, F. Marie, J. L. Sida, M. Mac Cormick, M.D. Cortina-Gil, J. M. Casandjian, V. Fekou-Youmbi, K. W. Kemper, and J. S. Winfield
Subjects: Physics, Elastic scattering, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Nuclear Theory, Inelastic scattering, Breakup, Coupling (probability), Polarization (waves), 01 natural sciences, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Beam (structure), Energy (signal processing)
Abstract: To study the effect of the weak binding energy on the interaction potential between a light exotic nucleus and a target, elastic scattering of ${}^{6}\mathrm{He}$ at 38.3 MeV/nucleon on a ${}^{12}\mathrm{C}$ target was measured at Grand Acc\'el\'erateur National d'Ions Lourds (GANIL). The ${}^{6}\mathrm{He}$ beam was produced by fragmentation. The detection of the scattered particles was performed by the GANIL spectrometer. The energy resolution was good enough to separate elastic from inelastic scattering contributions. The measured elastic data have been analyzed within the optical model, with the real part of the optical potential calculated in the double-folding model using a realistic density-dependent nucleon-nucleon interaction and the imaginary part taken in the conventional Woods-Saxon (WS) form. A failure of the ``bare'' real folded potential to reproduce the measured angular distribution over the whole angular range suggests quite a strong coupling of the higher-order breakup channels to the elastic channel. To estimate the strength of the breakup effects, a complex surface potential with a repulsive real part (designed to simulate the polarization effects caused by the projectile breakup) was added to the real folded and imaginary WS potentials. A realistic estimate of the polarization potential caused by the breakup of the weakly bound ${}^{6}\mathrm{He}$ was made based on a parallel study of ${}^{6}\mathrm{He}{+}^{12}\mathrm{C}$ and ${}^{6}\mathrm{Li}{+}^{12}\mathrm{C}$ optical potentials at about the same energies.
Published: 2002

42. Sub-barrier and near-barrier fusion study of halo nuclei

Author: N. Alamanos, M. Trotta, A. Pakou, J. L. Sida, and V. Lapoux
Subjects: Physics, heavy-ion fusion, Nuclear and High Energy Physics, Fusion, penetration model, folding model, dependence, breakup, incompressibility, subbarrier fusion, Optical potential, Entrance channel, potentials, Fundamental difference, elastic-scattering, Halo, Atomic physics, enhancement
Abstract: The near-barrier and sub-barrier fusion of light unstable nuclei and their respective stable isotopes with heavy targets ${(}^{4,6}\mathrm{He}{+}^{209}\mathrm{Bi},$ ${}^{4,6}\mathrm{He}{+}^{238}\mathrm{U},$ ${}^{9,11}\mathrm{Be}{+}^{209}\mathrm{Bi},$ and ${}^{9}\mathrm{Be}{+}^{208}\mathrm{Pb})$ is investigated via coupled channel calculations. The entrance channel optical potential is generated via a microscopic BDM3Y1 interaction. A rather satisfactory description of the experimental data is obtained under the condition that the real part of the optical potential has to be reduced for the weakly bound and halo systems. This reduction proves to be the fundamental difference in treating stable and weakly bound nuclei, and can be attributed to the loss of a flux due to breakup effects.
Published: 2002

43. Proton reaction cross-section measurements on stable and neutron-rich nuclei as a probe of the nucleon-nucleus interaction

Author: N. Alamanos, F. Marie, A. Gillibert, J. P. Delaroche, F. Carstoiu, J. C. Angélique, P. Roussel-Chomaz, N. A. Orr, A. de Vismes, Michel Girod, S. M. Lukyanov, F. Sarazin, N. K. Skobelev, M. D. Cortina-Gil, E. Bauge, F. Auger, Alinka Lepine-Szily, F. de Oliveira, A. Pakou, W. N. Catford, J. Barrette, A.V. Belozyorov, D. Hirata, W. Mittig, S. Ottini-Hustache, Y. E. Penionzhkevich, Z. Dlouhy, C. Borcea, H. Savajols, A. Musumarra, V. Lapoux, 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), 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), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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: Proton, Hydrogen, h-1(alpha, x), (na-28, x), (li-8, x), 01 natural sciences, 7. Clean energy, (mg-31, x), finite nuclei, (na-29, x), (mg-30, x), approximation, (li-9, x), optical-model analysis, Physics, (ne-25, x), consistent, (ne-24, x), potentials, medicine.anatomical_structure, isospin dependence, e approximate to 35-81 mev/nucleon, Atomic physics, Nucleon, (li-7, x), (be-9, x), (ne-23, x), (mg-32, x), inelastic-scattering, Nuclear and High Energy Physics, (he-6, x), (f-21, x), chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear physics, Cross section (physics), (mg-29, x), 0103 physical sciences, medicine, (f-22, x), comparison with model predictions, Neutron, elastic-scattering, (na-25, x), 010306 general physics, isotopes, (be-10, x), (na-26, x), 010308 nuclear & particles physics, Attenuation, (f-23, x), (be-11, x), (ne-26, x), radii, measured reaction sigma, (na-27, x), chemistry, (f-24, x), Nucleus
Abstract: Proton reaction cross-section measurements on various stable and neutron-rich nuclei (He-4,He-6, Li7-9, Be9-11, F21-24, N22-26, Na25-29 and Mg29-32) were performed via the attenuation method at intermediate energies (similar to 35-75 A MeV) and using a cryogenic hydrogen target. The results are discussed in the framework of different approaches of the nucleon-nucleus potential. (C) 2002 Elsevier Science B.V. All rights reserved. Nuclear Physics A
Published: 2002

44. Experiments on super-heavy nuclei at GANIL

Author: J. C. Steckmeyer, N. A. Orr, F. Hanappe, N. Lecesne, R. Hue, A. Drouart, F. Becker, R. Dayras, S. Grévy, A. Gillibert, N. Amar, J. M. Fontbonne, W. Mittig, C. Stodel, A. C. C. Villari, T. Legou, J.P. Wieleczko, J. C. Angélique, Jean Péter, D. Guerreau, F. de Oliveira, J. Tillier, M. G. Saint-Laurent, M. Lewitowicz, Zbigniew Sosin, R. de Tourreil, G. Politi, Rubens Lichtenthäler, E. Liénard, A. S. Lalleman, N. Alamanos, A. Wieloch, G. Auger, R. Anne, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Fazio G. Giardina G. Hanappe F. Imme G. Rowley N., FULIS, Guesnon, Sandrine, Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Physics, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], 010308 nuclear & particles physics, 0103 physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, XX, 01 natural sciences
Published: 2001

45. STUDY OF SUB-BARRIER AND NEAR-BARRIER FUSION OF HALO NUCLEI

Author: N. Alamanos, A. Pakou, V. Lapoux, M. Trotta, and J. L. Sida
Subjects: Physics, Fusion, Halo, XX, Molecular physics
Published: 2001

46. Electric and nuclear transition stength in $^{30,32}$Mg

Author: F. Marie, M. MacCormick, Alinka Lepine-Szily, N. Alamanos, A. Pakou, S. M. Lukyanov, V. Chiste, R. Liguori Neto, J. Barrette, N. A. Orr, Alexander Ostrowski, V. Lapoux, F. de Oliveira Santos, P. Roussel-Chomaz, W. Mittig, Z. Dlouhy, S. Ottini, F. Auger, Yu. E. Penionzhkevich, M.D. Cortina-Gil, J. L. Sida, F. Braga, Rubens Lichtenthäler, M. Lewitowicz, A. Gillibert, 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), 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), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, Stochastic matrix, Charge (physics), Inelastic scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Rotational model, Transition strength, Excited state, 0103 physical sciences, Atomic physics, 010306 general physics
Abstract: The charge and mass transition matrix elements of the neutron-rich isotopes 30,32 Mg have been extracted from inelastic scattering on 208 Pb and 12 C targets at 32 A MeV. The measured inelastic cross sections for the first 2 + states were compared to coupled-channels calculations, which take into account the feeding from higher excited states. The method was tested with 24 Mg inelastic scattering data obtained in the same experiment. In the framework of the rotational model, the charge and mass deformations are identical and large (| β |∼0.5–0.6) for both isotopes.
Published: 2001

47. Sub-barrier fusion with the He-6 halo nucleus

Author: C. Jouanne, A. Gillibert, A. Lépine, C. Daniel, S Ternier, N. Alamanos, A. Drouart, M. Trotta, Marc Huyse, C. Borcea, S. Ottini, D. L. Balabanski, Katrien Vyvey, J. L. Sida, A. Musumarra, C. Volant, J. D. Hinnefeld, Gerda Neyens, R. Wolski, P. Van Duppen, Riccardo Raabe, D. J. C. Durand, Nico Coulier, Georgi P. Georgiev, V. Lapoux, A. Lumbroso, F. Marie, F. Auger, and A. N. Andreyev
Subjects: Physics, Nuclear and High Energy Physics, Fusion, chemistry, Scattering, Fission, Projectile, Isobar, chemistry.chemical_element, Halo nucleus, Penetration (firestop), Atomic physics, Helium
Abstract: The fusion-fission cross sections of the He-4 + U-238 and He-6 + U-238 systems have been measured, at Louvain-la-Neuve (Belgium), for energies around and below the barrier. The helium projectiles impinges on a UF4 target. The fission fragments and the possible projectile residue are detected using an array of Si detectors for angles ranging from 30 to 150 degrees. The data taken with He-4 are in good agreement with previous data and with the fusion calculation. The He-6 data show a regular trend with an enhancement below the barrier compared to He-4 + U-238 or Li-6 + U-238. This enhancement could be due to the fusion process itself or to a transfer component which triggers the fission without being detected in our set-up. The data for the A=4 and A=6 isobars are compared to a simple barrier penetration model.
Published: 2001

48. Super-heavy nuclei production at GANIL

Author: G. Auger, J. C. Steckmeyer, A. S. Lalleman, R. Anne, R. de Tourreil, J. P. Wleleczko, R. Hue, M. Lewitowicz, N. Alamanos, F. de Oliveira, A. Wieloch, N. Amar, J. M. Fontbonne, A. Drouart, E. Liénard, F. Hanappe, N. Lecesne, Zbigniew Sosin, A. Gillibert, N. A. Orr, G. Politi, Jean Péter, R. Dayras, W. Mittig, T. Legou, C. Stodel, M. G. Saint-Laurent, Rubens Lichtenthäler, S. Grévy, A. C. C. Villari, D. Guerreau, J. Tillier, F. Becker, J. C. Angélique, 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), 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 Lion, Michel
Subjects: Nuclear physics, Physics, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Production (economics), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], XX
Published: 2001

49. Production of superheavy elements at GANIL

Author: T. Legou, J. M. Fontbonne, G. Auger, J. C. Angélique, G. Politi, M. G. Saint-Laurent, R. Anne, E. Plagnol, J. M. Casandjian, M. Lewitowicz, N. Lecesne, A. Gillibert, R. Dayras, J.P. Wieleczko, W. Mittig, A. C. C. Villari, R. Hue, A. Drouart, D. Guerreau, F. Hanappe, N. A. Orr, J. C. Steckmeyer, Jean Péter, J. Tillier, E. Liénard, Rubens Lichtenthäler, L. Maunoury, R. de Tourreil, C. Stodel, S. Grévy, N. Amar, A. S. Lalleman, N. Alamanos, A. Wieloch, 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), 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), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Arnould M. Lewitowicz M. Oganessian yu. Ts. Akimune H. Ohta M. Utsunomiya H. Wada T. Yamagata T., 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)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Wien filter, Isotope, 010308 nuclear & particles physics, Chemistry, Krypton, chemistry.chemical_element, Germanium, Electron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Superheavy Elements, 01 natural sciences, 7. Clean energy, Nuclear physics, 13. Climate action, 0103 physical sciences, Incident beam, Atomic physics, 010306 general physics, Beam (structure)
Abstract: A long-term new experimental program has begun at GANIL, i.e. search for new super heavy nuclei and their structure. The first part consists in studying the structure of the 273110 isotope which involves the development of high intensity Se beam. In parallel, reactions involving Inverse Kinematics will be studied allowing to have a versatileness set-up. By adding germanium and electron detectors, spectroscopic studies could be made on trans-fermium elements. Preliminary results showed that the Wien Filter has a suppression of the incident beam with a 1010 factor, which is comparable with results elsewhere. We show recent results with the present set-up at GANIL in producing Fr isotopes in the Kr+Sb reaction. We present also the result of our Kr+Pb experiment, which tried to reproduce the Berkeley result of the element 118.
Published: 2001

50. Production of Super Heavy Elements at GANIL: Present Status and Perspectives

Author: N. Alamanos, A. Wieloch, M. G. Saint-Laurent, T Legou, F Hanappe, J. C. Angélique, N. A. Orr, F. Becker, Rubens Lichtenthäler, E Lienard, G. Auger, R. de Tourreil, G. Politi, R. Anne, F. de Oliveira, R. Hue, J.P. Wieleczko, A. Drouart, N. Amar, D. Guerreau, J Tillier, A. Gillibert, C. Stodel, A. S. Lalleman, J. C. Steckmeyer, S. Grévy, Zbigniew Sosin, R. Dayras, W. Mittig, A. C. C. Villari, J M Fontbonne, 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), FULIS, Lion, Michel, Normandie Université (NU)-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: Silicon, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], 010308 nuclear & particles physics, High intensity, Detector, FOS: Physical sciences, chemistry.chemical_element, Transactinide element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Ion, Nuclear physics, chemistry, 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Beam (structure)
Abstract: Experiments on the production and study of superheavy nuclei have been undertaken at GANIL taking advantages of the powerful velocity filter LISE3 and the high intensity ECR ion sources. A complete set-up has been built: - reaction chamber containing large rotating wheels, - slits and beam profiler at mid-filter, - detection chamber with time-of-flight and Silicon detectors for identifying evaporation residues and their decay products. The response was checked via fusion reactions with known cross sections producing known alpha-decay chains and fission fragments. Excellent transmission of evaporation residues and rejection factor for the primary beam were obtained. This device is presented together with the results obtained in our last experiments and our future plans are discussed., proceeding to the ASR2001 Conference, Tokai, Japan, november 2001, to be published in the Journal of Nuclear and Radiiochemical Sciences (june 2002)
Published: 2001

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