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7 results on '"O, Sorlin"'

1. Shell and Shapes in the N = 28 Isotones

Author

L. Cáceres, Zs. Dombrádi, C. Force, L. Gaudefroy, S. Grévy, F. Nowacki, D. Sohler, O. Sorlin, Hajime Susa, Marcel Arnould, Sydney Gales, Tohru Motobayashi, Christoph Scheidenberger, Hiroaki Utsunomiya, 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), Institute for Nuclear Research [Budapest] (ATOMKI), Hungarian Academy of Sciences (MTA), 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), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H. Susa, M. Arnould, S. Gales, T. Motobayashi, C. Scheidenberger, H. Utsunomiya, 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 Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Isomeric decay, 21.10.Jx, 21.10.Pc, 21.10.Re, 23.35.+g, Nuclear Theory, Hadron, quenching, Fermion, shape coexistence, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Atomic orbital, Quadrupole, Neutron, Isotopes of silicon, Atomic physics, Nuclear Experiment, Nucleon, Ground state
Abstract

International audience; New experimental results on 43S and 44S reveal that these nuclei are located in a transitional region of shape coexistence between the spherical 48Ca and the oblate 42Si. The origin of the deformation is discussed in terms of the evolution of the single particle energy levels leading to the compression of the energy difference of the orbitals in the sd and pf shells for protons and neutrons, respectively. Therefore, due to quadrupole excitations across the Z = 14 and N = 28 gaps, the intruder configuration in the neutron rich S isotopes became the ground state.

Published
2010

2. Study of [sup 60]Fe(n,γ)[sup 61]Fe reaction of astrophysical interest via d([sup 60]Fe,pγ) indirect reaction

Author

S. Giron, F. Hammache, N. de Séréville, D. Beaumel, J. Burgunder, L. Caceres, E. Clement, G. Duchene, F. Flavigny, G. De France, S. Franchoo, B. Fernandez, D. Galaviz-Redondo, L. Gasques, J. Gibelin, A. Gillibert, S. Grevy, J. Guillot, M. Heil, J. Kiener, V. Lapoux, F. Maréchal, A. Matta, Y. Matea, M. Moukaddam, L. Nalpas, A. Obertelli, L. Perrot, R. Raabe, J. A. Scarpaci, O. Sorlin, I. Stefan, C. Stoedel, M. Takechi, J. C. Thomas, Y. Togano, Claudi Spitaleri, Claus Rolfs, and Rosario G. Pizzone

Subjects
Nuclear reaction, Physics, Angular momentum, 010308 nuclear & particles physics, Context (language use), 7. Clean energy, 01 natural sciences, Nuclear physics, Supernova, Nucleosynthesis, Excited state, 0103 physical sciences, Atomic physics, Radioactive decay, Excitation
Abstract

INTEGRAL and RHESSI spacecrafts recently detected the 1.173 and 1.333 MeV γ‐ray lines coming from the 60Fe—60Co—60Ni radioactive decay chain. The long lived isotope 60Fe (T1/2 = 1.5 106y) is believed to be primarily produced in core‐collapse supernovae. However the interpretation of the observations is difficult because of the large uncertainties concerning 59Fe(n,γ)60Fe and 60Fe(n,γ)61Fe cross sections, involved in 60Fe nucleosynthesis.The direct component of the 60Fe(n,γ)61Fe reaction was studied indirectly via the d(60Fe,pγ)61Fe transfer reaction. The experiment performed in GANIL in spring 2009 will allow to determine the excitation energies of the populated excited states of 61Fe and for the first time their spectroscopic factors as well as their transfer angular momentum.I will first give an overview of the astrophysical context, then I will describe the experimental setup and finally present some preliminary results of the ongoing analysis.

Published
2010

3. Search for resonances in 4n, 7H and 9He via transfer reactions

Author

E. C. Pollacco, A. Drouart, V. Lapoux, J. A. Scarpaci, V. Lima, F. Hammache, A. Gillibert, A. Obertelli, E. Khan, E. Rich, O. Sorlin, L. Gaudefroy, Erik Tryggestad, Y. Blumenfeld, L. Nalpas, Sydney Gales, P. Roussel-Chomaz, E. Becheva, D. Santonocito, F. Delaunay, G. M. Ter Akopian, D. Beaumel, S. Fortier, J. Guillot, U. Datta Pramanik, N. Frascaria, K. W. Kemper, S. V. Stepantsov, F. Skaza, R. Wolski, A. S. Fomichev, 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 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), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Yu. E. Penionzhkevich, E. A. Cherepanov, SPIRAL, 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 reaction, nuclear resonances, 010308 nuclear & particles physics, Neutron emission, neutrons, helium, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, 27.20.+n, 25.60.Je, Spectral line, nuclei with mass number 6 to 19, hydrogen, Helium-3, 0103 physical sciences, Tetraneutron, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Ground state
Abstract

NESTER PTH, Détecteur MUST; International audience; Investigation of unbound nuclear systems 9He, 7H and 4n was performed at GANIL-SPIRAL using the 8He beam at 15.3 A MeV and a CD2 target. The missing mass spectra were deduced from kinetic energies and emission angles of light ejectiles detected by the Silicon array MUST. In addition to previously known low-lying narrow resonant states in 9He, the d(8He,p) reaction displays a structure just above neutron emission threshold, identified with the “true” ground state of 9He. The analysis of angular distributions shows that the inversion of s1/2 and p1/2 neutron shells previously observed in 11Be and 10Li also exists in the lightest N=7 isotone 9He. The d(8He,3He) and d(8He,6Li) reactions were used to search for resonant states in the t+4n (7H) and 4n systems, respectively. The missing mass spectrum of the 4n system does not give evidence for the existence of a bound “tetraneutron”. However the comparison with the results of 5-body phase-space calculations emphasizes the existence of correlations in the 4n system. The broad structure observed at ~=2 MeV above the t+4n emission threshold is proposed to be the ground state of 7H

Published
2007

4. γ-Spectroscopy Of Carbon And Oxygen Isotopes At The Neutron Drip-Line

Author

H. Savajols, P. Roussel-Chomaz, S. Grévy, Y. E. Penionzhkevich, F. Becker, Z. Dlouhy, M. Belleguic, D. Guillemaud-Muller, M. G. Saint Laurent, C. Borcea, Andras Kerek, Zsolt Dombrádi, F. Azaiez, S. K. Mandal, J. Mrazek, P. Mayet, József Tímár, O. Sorlin, M. Stanoiu, A. D. Yamamoto, F. Negoita, D. Sohler, M. Lewitowicz, Zs. Fülöp, Zsolt Podolyak, S. M. Lukyanov, Ch. Bourgeois, G. Sletten, C. N. Timis, A. Krasznahorkay, and H. van der Marel

Subjects
Chemistry, Astrophysics::High Energy Astrophysical Phenomena, Excited state, Gamma spectroscopy, Neutron, Nuclear drip line, Atomic physics, Nuclear Experiment, Spectroscopy, Isotopes of caesium, Isotopes of oxygen, Isotopes of nitrogen
Abstract

Carbon and oxygen isotopes very close to the neutron drip‐line have been studied using in beam gamma spectroscopy with fragmentation reactions of radioactive secondary beams. No γ‐ray transitions have been observed in both 23O and 24O suggesting that probably only the ground state of these two oxygen isotopes is bound with respect to particle emission. In the case of 19C and 20C only a single line has been observed in each of the corresponding γ‐ray spectra. The interpretation of the results is made by comparison to shell model calculations.

Published
2003

5. Dynamical description of the break-up of exotic nuclei: The [sup 11]Be case

Author

V. Duflot, Y. Blumenfeld, H. Savajols, J. A. Scarpaci, Ph. Chomaz, V. Lima, J. Duprat, Marin Chabot, Ch. Bourgeois, P. Roussel-Chomaz, Muriel Fallot, O. Sorlin, D. Guillemaud-Mueller, S. Grévy, P. Desesquelles, Denis Lacroix, and N. Frascaria

Subjects
Physics, Radioactive ion beams, Nuclear physics, Triple coincidence, Break-Up, Neutron emission, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Gamma ray, Neutron, Nuclear Experiment
Abstract

The break-up of 11Be was measured in the Ti (11Be, 10Be+n+γ) reaction at the GANIL facility performing a triple coincidence between the 10Be ejectile, a neutron and gamma rays. Correlations between the ejectile and the neutrons were extracted and compared with a dynamical calculation. This time dependent calculation reproduces the salient features of the data confirming in particular the neutron emission through the nuclear potential known as “towing mode.” The possibility to use this mechanism as a spectroscopic tool for exotic nuclei is discussed.

Published
2002

6. Momentum distributions from core-breakup reactions of [sup 11]Be and [sup 11]Li

Author

Thomas Nilsson, O. Sorlin, Gunnar Nyman, P. Hornshøj, A.C. Mueller, N. A. Orr, M. Lewitowicz, Björn Jonson, Leif Axelsson, M. G. Saint-Laurent, S. Grévy, F. Pougheon, J. C. Angélique, K. Riisager, M. H. Smedberg, R. Anne, and D. Guillemaud-Mueller

Subjects
Core (optical fiber), Nuclear physics, Physics, Momentum, Nuclear Theory, Nuclear structure, Neutron spectra, Neutron, Halo, Atomic physics, Nuclear Experiment, Breakup, Coincidence
Abstract

The experiment was performed at GANIL and the secondary beams of the halo nuclei {sup 11}Be and {sup 11}Li impinged onto a Be target with energies of 38.5 MeV/u and 29.9 MeV/u, respectively. The distribution of neutrons in coincidence with fragments from the core-breakup reactions were studied. This reaction is interesting as the halo neutrons are expected to be released without any major distortion due to the reaction.

Published
1999

7. Beta-decay studies of nuclei far from stability near N=28

Author

V. S. Salamatin, F. Pougheon, Leif Axelsson, V. Borrel, W. Böhmer, R. Anne, Yu. E. Penionzhkevich, A. Wöhr, T. Mehren, B. Pfeiffer, A.C. Mueller, D. Guillemaud-Mueller, M. G. Saint-Laurent, O. Sorlin, M. Lewitowicz, S. Schoedder, H. Keller, D. Bazin, S. M. Lukyanov, Y. Jading, K‐L. Kratz, 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), Vergnes M. Goutte D. Heenen P.H. Sauvage J., 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), Busso M., Gallino R., Raiteri C.M., Robert, Suzanne, Lion, Michel, Busso M., Gallino R., Raiteri C.M., 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, Isotope, Spectrometer, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear structure, Shell (structure), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010502 geochemistry & geophysics, 7. Clean energy, 01 natural sciences, Beta decay, Nuclear physics, Allende meteorite, Nucleosynthesis, 0103 physical sciences, r-process, Atomic physics, Nuclear Experiment, 010306 general physics, 0105 earth and related environmental sciences
Abstract

Beta‐decay half‐lives and β‐delayed neutron‐emission probabilities of the very neutron‐rich nuclei 43P, 42,44,45S and 44‐46Cl, 47Ar have been recently measured. These isotopes, which lie at or close to the N=28 magic shell were produced at GANIL in interactions of a 60 MeV/u 48Ca beam with a 64Ni target, and were separated by the doubly achromatic spectrometer LISE3. Their decay was studied by a β or β‐n time correlation measurement. The results are compared to recent model predictions and indicate a rapid weakening of the N=28 shell below 4820Ca28. The nuclear structure effects reflected in the decay properties of the exotic S and Cl isotopes may be the clue for the astrophysical understanding of the unusual 48Ca/46Ca abundance ratio measured in the solar system, or observed in EK‐inclusions of the Allende meteorite.

Published
1995

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