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1. Study of the N = 50 major shell effect toward 78Ni at PARRNe⋆

Author: J. Proust, C. Lau, D. Verney, S. Du, F. Le Blanc, Ch. Bourgeois, S. Essabaa, S. Gales, J.C. Potier, C. Donzaud, O. Sorlin, F. Clapier, J. Sauvage, F. Ibrahim, O. Bajeat, A.C. Mueller, H. Lefort, N. Pauwels, O. Hubert, F. Pougheon, E. Cottereau, B. Roussière, M. Ducourtieux, J. Obert, D. Guillemaud-Mueller, and O. Perru
Subjects: Physics, Coupling, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Hadron, Shell (structure), 01 natural sciences, Beta decay, Nuclear physics, Excited state, 0103 physical sciences, Nuclear fusion, Neutron, Atomic physics, 010306 general physics, Excitation
Abstract: The γ-ray de-excitations following the β-decay of 83Ga and the β-n decay of 84Ga have been studied. The radioactive species were produced using the PARRNe on-line mass-separator installed at the IPN Orsay Tandem accelerator. Two γ-lines were attributed to 83Ge with the aid of β-γ and γ-γ coincidences. The Z identification of the γ-lines was provided by time analysis of a buid-up/decay cycle. The excited levels of 83Ge can be explained by the coupling of the single neutron state ν2d 5/2 to the first 2+ excitation of the 82Ge core.
Published: 2006

2. Observation of bound excited states in 15B

Author: S. M. Lukyanov, J. C. Angélique, H. Savajols, M. J. Lopez-Jimenez, Y. Sobolev, M. Lewitowicz, D. Guillemaud-Mueller, M. Stanoiu, W. Mittig, C. Stodel, C. Bourgeois, Josette Duprat, F. Pougheon, Marie-Geneviève Porquet, B. A. Brown, Yu. E. Penionzhkevich, F. De Oliveira-Santos, C. Donzaud, O. Sorlin, F. Azaiez, P. Roussel-Chomaz, József Tímár, N. L. Achouri, D. Sohler, S. Grévy, Z. Dlouhy, M. Belleguic, C. Borcea, S. Leenhardt, Zs. Dombrádi, M. G. Saint-Laurent, J. M. Daugas, 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), 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 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)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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: Physics, Nuclear and High Energy Physics, Valence (chemistry), 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Hadron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Time of flight, Projectile and target fragmentation, Excited state, 0103 physical sciences, Bound state, Nuclear fusion, Neutron, 25.70.Mn, 23.20.Lv, 27.20.+n, 21.60.Cs, Atomic physics, Nuclear Experiment, 010306 general physics, Spectroscopy, gamma transitions and level energies
Abstract: The structure of the A/Z = 3 nucleus 15B has been investigated using the in-beam $\gamma$ -spectroscopy technique with a fragmentation reaction of a 36S beam on a 9Be target at 77.5 ${\rm MeV}\cdot A$ . The fragments were identified and selected by their energy loss and time of flight using the SPEG spectrograph. $\gamma$ -ray energies and intensities have been measured in coincidence with the projectile-like fragments. From this information as well as from the $\gamma\gamma$ -coincidence relationships a level scheme is proposed for 15B up to the neutron separation energy. The experimental results have been interpreted using shell model calculations in the psd valence space. Effects of the weakly bound nature of the valence neutrons have been observed.
Published: 2004

3. Study of the N=50 shell closure close to 78Ni

Author: L. Gaudefroy, B. Roussière, S. Gales, F. Hosni, E. Cottereau, O. Bajeat, C. Donzaud, A.C. Mueller, O. Sorlin, H. Lefort, F. Le Blanc, Ch. Bourgeois, Fairouz Hammache, F. Pougheon, S. Essabaa, N. Pauwels, J. Sauvage, D. Guillemaud-Mueller, D. Verney, F. Clapier, S. Du, J.C. Potier, O. Perru, M. Ducourtieux, F. Ibrahim, J. Proust, C. Lau, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de 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), Lion, Michel, 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, Tandem, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], 010308 nuclear & particles physics, Fission, Closure (topology), Shell (structure), General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, Deuterium, 0103 physical sciences, Neutron, 010306 general physics, Nuclear Physics
Abstract: The PARRNe (Production d'Atomes Radioactifs Riches en Neutrons) experimental program has been part of the recent R&D efforts for the design of the SPIRAL2 project at GANIL. The PARRNe2 set-up installed at IPNOrsay allows the use of the Tandem as a deuteron driver in order to produce mass separated fission fragment beams. The measured fission fragment yields proved to be high enough to undertake a series of beta-decay experiments dedicated at studying the structure of proton-deficient nuclei close to N=50. We report here on two such experiments, the first being dedicated at the observation of the decay of 83Ga->83Ge (Z=32, N=51), 84Ga->84Ge (Z=32, N=52) and the second of the decay of 81Zn->81Ga (Z=31, N=50) allowing for the fist time the identification of a few gamma lines with transitions in the daughter nuclei thus providing the material for a preliminary glimpse of their structure.
Published: 2004

4. Decay of neutron-rich Ga isotopes near N = 50 at PARRNe

Author: J.C. Potier, S. Gales, O. Perru, C. Donzaud, N. Pauwels, F. Pougheon, J. Sauvage, M. Ducourtieux, F. Clapier, D. Verney, J. Obert, B. Roussière, O. Sorlin, E. Cottereau, J. Proust, F. Ibrahim, C. Lau, A.C. Mueller, D. Guillemaud-Mueller, O. Bajeat, F. Le Blanc, Ch. Bourgeois, and H. Lefort
Subjects: Physics, Nuclear and High Energy Physics, Isotope, Excited state, Neutron, Atomic physics, Atomic and Molecular Physics, and Optics, Coincidence
Abstract: The PARRNe facility has been used to produce neutron-rich isotopes 83,84Gaby the ISOL method. Their decay has been studied, and β-γ coincidence and γ-γ coincidence data were collected as a function of time. The first two excited levels in 83Ge and the first excited level in 84Ge have been measured for the first time.
Published: 2003

5. Recent studies to improve release properties from thick isotope separator on-line fission targets

Author: J. Sauvage, F. Pougheon, E. Cottereau, F. Le Blanc, C. Donzaud, J.C. Potier, A.C. Mueller, A. Wojtasiewicz, D. Guillemaud-Mueller, F. Clapier, S. Essabaa, J. Proust, C. Lau, H. Lefort, M. Ducourtieux, D. Verney, N. Pauwels, F. Ibrahim, J. Obert, B. Roussière, F. Hosni, O. Bajeat, 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: Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, Fission, Chemistry, Radiochemistry, Plasma, 01 natural sciences, Ion source, Ion, 0103 physical sciences, Neutron, 010306 general physics, Instrumentation, Separator (electricity), Line (formation)
Abstract: In the framework of the PARRNe program (Production d’Atomes Radioactifs Riches en Neutrons) of IPN Orsay, various techniques are currently used to characterize the release properties of elements of interest from a UCX target. On-line studies have been carried out with two plasma ion sources: a Nier–Bernas and a hot plasma ISOLDE-type (the ISOLDE collaboration kindly supplied us a MK5 ion source for these studies). In parallel, the analysis of the chemical and structure properties of some UCX samples as function of heating conditions has been carried out. Such data are essential to determine optimal conditions for the production of isotopes by the isotope separator on-line (ISOL) technique. First results are presented here for Kr and Ag. Investigations for other kinds of fission targets are planned.
Published: 2003

6. Photo-fission for the production of radioactive beams ALTO project

Author: M. Omeich, F. Clapier, F. Le Blanc, O. Bajeat, B. Jacquemard, J C Le Scornet, P. Ausset, J. Lesrel, F. Pougheon, O. Perru, G. Rossat, A. Tkatchenko, A. C. Mueller, D. Gardès, G. Bienvenu, F. Ibrahim, J. Obert, B. Waast, H. Lefort, T. Junquera, J.C. Potier, L. Coacolo, D. Grialou, O. Sorlin, J. Proust, B. Roussière, S. Galès, T. Garvey, D. Verney, J. Sauvage, C. Donzaud, J.P. Baronick, C. Lau, J. Arianer, D. Guillemaud-Mueller, A. Muller, Louis Rinolfi, S. Essabaa, N. Rouvière, D. Forkel-Wirth, J.C. Bourdon, F. Hosni, and M. Ducourtieux
Subjects: Physics, Nuclear and High Energy Physics, Large Hadron Collider, Fission, Nuclear Theory, Particle accelerator, Electron, Linear particle accelerator, Neutron temperature, law.invention, Nuclear physics, law, Cathode ray, Physics::Accelerator Physics, Neutron, Nuclear Experiment, Instrumentation
Abstract: In order to probe neutron rich radioactive noble gases produced by photo-fission, a PARRNe-1 experiment (Production d’Atomes Radioactifs Riches en Neutrons) has been carried out at CERN. The incident electron beam of 50 MeV was delivered by the LIL machine: LEP Injector Linac. The experiment allowed us to compare under the same conditions two production methods of radioactive noble gases: fission induced by fast neutrons and photo-fission. The obtained results show that the use of the electrons is a promising mode to get intense neutron rich ion beams. After the success of this photo-fission experiment, a conceptual design for the installation at IPN Orsay of a 50 MeV electron accelerator close to the PARRNe-2 device has been worked out: ALTO Project. This work has started within a collaboration between IPNO, LAL (Laboratoire de l’Accelerateur Lineaire) and CERN groups.
Published: 2003

7. New region of deformation in the neutron-rich 60 24Cr36 and 62 24Cr38

Author: F. de Oliveira Santos, J. C. Angélique, B. Pfeiffer, Yu. E. Penionzhkevich, F. Ibrahim, S. Grévy, D. Guillemaud-Mueller, F. Nowacki, J. Mrasek, Karl Kratz, M. Lewitowicz, C. Donzaud, F. Azaiez, Z. Dlouhy, V. Chiste, F. Pougheon, M. Stanoiu, Alfredo Poves, S. M. Lukyanov, M. G. Saint-Laurent, O. Sorlin, C. Bourgeois, 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), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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), 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), 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: Physics, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, Hadron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, medicine.anatomical_structure, Atomic orbital, 0103 physical sciences, medicine, Nuclear fusion, Neutron, Atomic physics, 010306 general physics, Random phase approximation, Spectroscopy, Nucleus
Abstract: The neutron-rich nuclei 23 60-63V have been produced at GANIL via interactions of a 61.8A·MeV 76Ge beam with a 58Ni target. Beta-decay to 24 60-63Cr has been investigated using combined β- and γ-ray spectroscopy. Half-lives of the 60-63V nuclei have been determined, and the existence of a beta-decay isomer in the 60V nucleus is strongly supported. The observation of low-energy 2+ states in 60Cr (646keV) and 62Cr (446keV) suggests that these isotopes are strongly deformed with β2 ∼ 0.3. This is confirmed by shell model calculations which show the dominant influence of the intruder g and d orbitals to obtain low 2+ energies in the neutron-rich Cr isotopes.
Published: 2003

8. Release properties of UCx and molten U targets

Author: J. Proust, J. Sauvage, S. Essabaa, C. Lau, J.C. Potier, F. Ibrahim, O. Bajeat, N. Barré, C. F. Liang, E. Cottereau, O. Sorlin, F. Le Blanc, A. Wojtasiewicz, C. Donzaud, D. Verney, D. Guillemaud-Mueller, B. Roussière, F. Pougheon, H. Lefort, J. Obert, N. Pauwels, M. Ducourtieux, A.C. Mueller, and F. Clapier
Subjects: Nuclear and High Energy Physics, chemistry.chemical_compound, chemistry, Radiochemistry, Uranium carbide, Experimental methods, Instrumentation, Release time, Ion source
Abstract: The release properties of UCx and molten U thick targets associated with a Nier–Bernas ion source have been studied. Two experimental methods are used to extract the release time. Results are presented and discussed for Kr, Cd, I and Xe.
Published: 2002

9. Erratum to 'Beta decay half-lives of neutron rich Ti–Co isotopes around N=40' [Nucl. Phys. A 660 (1999) 3–19]

Author: F. de Oliveira Santos, C. Borcea, F. Pougheon, Karl Kratz, M. G. Saint-Laurent, L. Petizon, Eric Chabanat, O. Sorlin, C. Longour, R. Béraud, A. Emsallem, G. Canchel, M. J. Lopez, Leif Axelsson, M. Lewitowicz, M. Belleguic, J. E. Sauvestre, J. M. Daugas, C. Donzaud, S. Leenhardt, M. Girod, B. Pfeiffer, D. Guillemaud-Mueller, 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), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-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), 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 Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear reaction, Physics, Nuclear and High Energy Physics, Isotopes of chromium, 010308 nuclear & particles physics, Context (language use), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Beta decay, Isotopes of vanadium, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Isotopes of cobalt, Radioactive decay
Abstract: The neutron-rich 57−59 Ti, 59−62 V, 61−64 Cr, 63−66 Mn, 65−68 Fe, 67−70 Co have been produced at GANIL via interactions of a 60.4 MeV/u 86 Kr 34+ with a 58 Ni target. They have been separated by the doubly achromatic spectrometer LISE3. Beta-decay half-lives have been determined for all produced nuclei, and subsequent γ -rays have been observed for the most efficiently produced nuclei. The measured half-lives of vanadium and chromium isotopes are compared to QRPA calculations using ground states deformations from the FRDM or ETFSI models. In an astrophysical context, the short half-lives of 58 Ti and 64 Cr indicate that these nuclei are potential r-process progenitors, after β -decay, of 58 Fe and 64 Ni in certain inclusions of meteorites.
Published: 2000

10. Beta decay half-lives of neutron rich Ti–Co isotopes around

Author: O. Sorlin, Leif Axelsson, G. Canchel, C. Donzaud, J. M. Daugas, M. Lewitowicz, D. Guillemaud-Mueller, J. E. Sauvestre, M. G. Saint-Laurent, Eric Chabanat, A. Emsallem, C. Longour, R. Béraud, Karl Kratz, C. Borcea, L. Petizon, B. Pfeiffer, M. J. Lopez, S. Leenhardt, M. Belleguic, F. Pougheon, and F. de Oliveira Santos
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, Isotopes of chromium, Isotope, Isotopes of vanadium, Analytical chemistry, Neutron, Context (language use), Atomic physics, Beta decay, Radioactive decay
Abstract: The neutron-rich 57 – 59 Ti, 59 – 62 V, 61 – 64 Cr, 63 – 66 Mn, 65 – 68 Fe, 67 – 70 Co have been produced at GANIL via interactions of a 60.4 MeV/u 86 Kr 34+ with a 58 Ni target. They have been separated by the doubly achromatic spectrometer LISE3. Beta-decay half-lives have been determined for all produced nuclei, and subsequent γ -rays have been observed for the most efficiently produced nuclei. The measured half-lives of vanadium and chromium isotopes are compared to QRPA calculations using ground states deformations from the FRDM or ETFSI models. In an astrophysical context, the short half-lives of 58 Ti and 64 Cr indicate that these nuclei are potential r-process progenitors, after β -decay, of 58 Fe and 64 Ni in certain inclusions of meteorites.
Published: 1999

11. Cross sections, momentum distributions, and neutron angular distributions for11Beinduced reactions on silicon

Author: Z. Dlouhy, A. Fomitchev, M. Lewitowicz, F. Negoita, S. M. Lukyanov, F. Pougheon, M. G. Saint-Laurent, D. Guillemaud-Mueller, A.C. Mueller, C. Borcea, Yu. E. Penionzhkevich, N. K. Skobelev, F. Carstoiu, R. Anne, and O. Sorlin
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Momentum (technical analysis), Silicon, chemistry, 010308 nuclear & particles physics, 0103 physical sciences, chemistry.chemical_element, Nuclear cross section, Neutron, 010306 general physics, 01 natural sciences
Published: 1999

12. Neutrino absorption efficiency of an40Ardetector from the β decay of40Ti

Author: C. Donzaud, F. Pougheon, M. G. Saint-Laurent, W. Trinder, H. E. Swanson, A. Garcia, M. Lewitowicz, A.C. Mueller, S. Leenhardt, R. Anne, N. I. Kaloskamis, D. Guillemaud-Mueller, Eric Adelberger, O. Sorlin, and M. Bhattacharya
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Decay scheme, Electron energy, Photon emission, Proton, Branching fraction, Liquid argon, High Energy Physics::Experiment, Atomic physics, Neutrino, Absorption efficiency
Abstract: We studied $\ensuremath{\beta}$-delayed proton and $\ensuremath{\gamma}$ emission from ${}^{40}\mathrm{Ti}$ decay. We found ${t}_{1/2}=52.7\ifmmode\pm\else\textpm\fi{}1.5 \mathrm{ms}$ and observed 28 proton groups that we organized into a ${}^{40}\mathrm{Ti}$ decay scheme with 21 branches. The reduced transition strengths of these decay branches were then used to compute the neutrino detection efficiency of the ICARUS liquid argon time-projection chamber. We found ${}^{40}\mathrm{Ar}(\ensuremath{\nu},e)$ cross sections (for an electron energy threshold $W=5 \mathrm{MeV}$) of $(14.0\ifmmode\pm\else\textpm\fi{}0.3)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}43} {\mathrm{cm}}^{2},$ $(75.1\ifmmode\pm\else\textpm\fi{}1.8)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}43} {\mathrm{cm}}^{2},$ and $(3.2\ifmmode\pm\else\textpm\fi{}0.1)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}41} {\mathrm{cm}}^{2}$ for ${}^{8}\mathrm{B}$ neutrinos, hep neutrinos, and supernova neutrinos characterized by a temperature of 4.5 MeV.
Published: 1998

13. Study of subshell closure atN = 40 by Coulomb excitation

Author: M. Lewitowicz, F. de Oliveira, A. Gillibert, C. Bourgeois, J. M. Daugas, J. C. Angélique, A.C. Mueller, F. Pougheon, C. Borcea, O. Sorlin, M. G. Saint-Laurent, C. Donzaud, Josette Duprat, J. Kiener, M. Belleguic, J. S. Winfield, Yu. Sobolev, Yu. E. Penionzhkevich, S. Leenhardt, N. A. Orr, M. G. Porquet, D. Guillemaud-Mueller, F. Azaiez, S. Grévy, I. Deloncle, and F. Marie
Subjects: Nuclear physics, Physics, High energy, Fragmentation (mass spectrometry), Spectrometer, Coulomb excitation, Atomic physics, Excitation, Beam (structure)
Abstract: A Coulomb excitation experiment has been performed in order to study the subshell closure atN = 40 for neutron-rich nuclei. This subshell effect is thought to be enhanced when largeN/Z ratios are encountered. Therefore, theZ = 2868Ni is of particular interest in order to test this behaviour. Some experimental information is already available for68Ni at low excitation energy: a 0+ 2 isomer, a 2+ state and a long-lived 5- state. The high energy of the 2+ state suggests the shell closure though its reduced transition probabilityB(E2) has never been mesured. The nuclei68Ni,70,72Zn,76Ge have been produced in the fragmentation of a86Kr beam at 60 MeV/A. The selection of these secondary beams has been performed by LISE3 spectrometer at GANIL. Performances of the detector system “Château de Cristal” and preliminary results on reduced transition probabilitiesB(E2) are presented and discussed.
Published: 1998

14. Newμs isomers inTz=1 nuclei produced in the112Sn(63AMeV)+natNi reaction

Author: H. Keller, Z. Janas, S. Grévy, Y. E. Penionzhkevich, J. Szerypo, F. Pougheon, K. Rykaczewski, J.M. Corre, J. Zylicz, Robert Grzywacz, A. Fomichov, J. Wauters, Gerard Auger, A.C. Mueller, Marc Huyse, O. Sorlin, W. D. Schmidt-Ott, T. Dörfler, M. G. Saint-Laurent, C. Borcea, Oleg B. Tarasov, M. Lewitowicz, N. A. Orr, R. Anne, A. Piechaczek, D. Guillemaud-Mueller, Alexander Ostrowski, S. M. Lukyanov, and H. Grawe
Subjects: Physics, Nuclear and High Energy Physics, Crystallography, Nickel, chemistry, 010308 nuclear & particles physics, Isotopes of palladium, 0103 physical sciences, chemistry.chemical_element, Atomic physics, 010306 general physics, Kinetic energy, 01 natural sciences
Abstract: The short-lived isomeric states in the T{sub Z}=1 nuclei, {sup 94m}Pd [T{sub 1/2}=0.6(1) {mu}s] and {sup 96m}Ag [T{sub 1/2}=0.7(2) {mu}s], were identified among the fragmentation products of the {sup 112}Sn (63A MeV) + {sup nat}Ni (93.5 mg/cm{sup 2}) reaction at GANIL. The separation and identification of the reaction products was done by means of the Alpha and LISE3 magnetic spectrometers combined with time-of-flight, energy-loss, and total kinetic energy measurements. Evidence for isomeric states in {sup 80}Y, {sup 98}Cd, and {sup 102}Sn was also obtained. {copyright} {ital 1997} {ital The American Physical Society}
Published: 1997

15. Neutron-rich isotopesTi54−57

Author: Karl-Ludwig Kratz, F. Pougheon, A.C. Mueller, S. Grévy, M. Lewitowicz, W.-D. Schmidt-Ott, Thomas Rauscher, D. Guillemaud-Mueller, A. Ostrowsky, P. Möller, M. Robinson, O. Sorlin, B. Pfeiffer, T. Dörfler, T. Mehren, M. G. Saint-Laurent, T. Hild, V. Borrel, W. Böhmer, and R. Anne
Subjects: Physics, Nuclear and High Energy Physics, Decay scheme, Isotopes of germanium, 010308 nuclear & particles physics, 01 natural sciences, 7. Clean energy, Particle identification, Double beta decay, Isotopes of protactinium, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Nucleon, Radioactive decay
Abstract: The neutron-rich isotopes $^{54\mathrm{\ensuremath{-}}57}\mathrm{Ti}$ and $^{58\mathrm{\ensuremath{-}}60}\mathrm{Cr}$ are produced by fragmentation of a 64.5 MeV/nucleon $^{65}\mathrm{Cu}^{26+}$ beam in a 90 mg/${\mathrm{cm}}^{2}$ $^{9}\mathrm{Be}$ target. Following particle identification by energy loss and time of flight, the radioactive decay was observed by \ensuremath{\beta} singles and \ensuremath{\beta}\ensuremath{\gamma}-coincidence measurements. The results obtained for $^{58\mathrm{\ensuremath{-}}60}\mathrm{Cr}$ are compared to previous results, whereas the decay of the $^{54\mathrm{\ensuremath{-}}57}\mathrm{Ti}$ isotopes is studied here. \ensuremath{\gamma}-ray intensities and energies are estimated. The new experimental results are compared to quasi-random-phase-approximation predictions. \textcopyright{} 1996 The American Physical Society.
Published: 1996

16. B8proton halo via reaction and breakup cross section measurements

Author: S. M. Lukyanov, N. K. Skobelev, R. Anne, Oleg B. Tarasov, C. Borcea, M. Lewitowicz, F. Negoita, M. G. Saint-Laurent, F. Pougheon, F. Carstoiu, O. Sorlin, D. Bazin, D. Guillemaud-Mueller, V. Borrel, J.M. Corre, P. Roussel-Chomaz, Z. Dlouhy, H. Keller, A.J. Kordyasz, A.C. Mueller, Yu. E. Penionzhkevich, and A. S. Fomichev
Subjects: Physics, Diffraction, Nuclear and High Energy Physics, Spectrometer, Silicon, Charge density, chemistry.chemical_element, Breakup, Dissociation (chemistry), Nuclear physics, chemistry, Halo, Atomic physics, Nucleon
Abstract: The reaction cross section for {sup 8}B and {sup 7}Be and the breakup cross section for {sup 8}B on silicon have been measured for incident energies between 10 and 40 MeV/nucleon with a stack of silicon detectors. Secondary {sup 8}B and {sup 7}Be beams were obtained by use of the LISE spectrometer at GANIL. The stack of silicon detectors had the multiple purpose of slowing down the incident secondary beams, identifying the reaction products, and measuring their energy. The separate contributions of diffraction dissociation and absorption to the breakup have been determined. The parallel momentum distribution of {sup 7}Be resulting from the breakup of {sup 8}B has also been determined. The data are compared to theoretical calculations. {copyright} {ital 1996 The American Physical Society.}
Published: 1996

17. Identification of new nuclei at and beyond the proton drip line near the doubly magic nucleusSn100

Author: A. Fomichov, R. Hue, Borrel, K. P. Rykaczewski, J. Zylicz, Robert Grzywacz, H. Keller, M. G. Saint-Laurent, A.C. Mueller, O. Sorlin, K.-H. Schmidt, W. D. Schmidt-Ott, J.M. Corre, R. Anne, C. Borcea, M. Lewitowicz, D. Guillemaud-Mueller, Marc Huyse, J. Wauters, M. Pfützner, S. M. Lukyanov, D. Bazin, G. Auger, Oleg B. Tarasov, T. Dörfler, J. Szerypo, F. Pougheon, Y. E. Penionzhkevich, and Z. Janas
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, medicine.anatomical_structure, Proton, medicine, MAGIC (telescope), Atomic physics, Nucleus, Line (formation)
Published: 1995

18. Identification of 100Sn and others proton drip-line nuclei in the reaction 112Sn(63 MeV/nucl.)+natNrmNi

Author: V. Borrel, M. Pfützner, K. Rykaczewski, J.M. Corre, D. Guillemaud-Mueller, J. Żylicz, Oleg B. Tarasov, A. Fomichov, Yu. E. Penionzhkevich, W. D. Schmidt-Ott, M. G. Saint-Laurent, Marc Huyse, G. Auger, Robert Grzywacz, O. Sorlin, R. Anne, J. Wauters, J. Szerypo, T. Dörfler, A.C. Mueller, R. Hue, C. Borcea, H. Keller, K.-H. Schmidt, M. Lewitowicz, D. Bazin, S. M. Lukyanov, Z. Janas, and F. Pougheon
Subjects: Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, 0103 physical sciences, Atomic physics, 010306 general physics, 01 natural sciences, Beam (structure), 3. Good health, Line (formation)
Abstract: Six new neutron-deficient nuclei 103Sb, 104Sb, 98In, 91Pd, 89Rh and 87Ru have been identified among the products of quasi-fragmentation of a 112Sn beam (63 MeV/nucl.), in addition to the previously reported 100Sn and 102Sn. Decays of over forty short-lived ( T 1 2 from ≈50 ns to 70μ s ) isomeric states including new isomer 66mAs were observed in the same reaction.
Published: 1995

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

Author: M. Lewitowicz, O. Sorlin, H. Keller, V. Borrel, Karl Kratz, A.C. Mueller, F. Pougheon, W. Böhmer, S. M. Lukyanov, R. Anne, M. G. Saint-Laurent, T. Mehren, D. Bazin, D. Guillemaud-Mueller, A. Wöhr, Y. Jading, S. Shoedder, Leif Axelsson, Yu. E. Penionzhkevich, and V. S. Salamatin
Subjects: Physics, Nuclear and High Energy Physics, Solar System, Isotope, Nuclear structure, Atomic physics, Beta decay, Time correlation
Abstract: Beta-decay half-lives and β-delayed neutron-emission probabilities of the very neutron-rich nuclei 43 P, 42,44,45 S and 44–46 Cl, 47 Ar, which lie at or close to the N=28 magic shell, have been recently measured through 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 effect below 48 Ca. 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 48 Ca 46 Ca abundance ratio measured in the solar system.
Published: 1995

20. Observation of 100Sn

Author: M. Pfützner, D. Guillemaud-Mueller, Marc Huyse, T. Dörfler, H. Keller, Yu. E. Penionzhkevich, W. D. Schmidt-Ott, J. Zylicz, M. G. Saint-Laurent, Oleg B. Tarasov, M. Lewitowicz, G. Auger, J.M. Corre, R. Anne, O. Sorlin, S. M. Lukyanov, K. Rykaczewski, Robert Grzywacz, F. Pougheon, A.C. Mueller, and C. Borcea
Subjects: Physics, Nuclear and High Energy Physics, Spectrometer, 010308 nuclear & particles physics, Cyclotron, 01 natural sciences, law.invention, Nuclear physics, law, 0103 physical sciences, MAGIC (telescope), Atomic physics, 010306 general physics, Beam (structure)
Abstract: Using a 112 Sn beam delivered by the GANIL cyclotrons in conjunction with the high acceptance device SISSI, proton-rich nuclei in the region of A=100 have been produced and subsequently analysed by the LISE3 spectrometer. As a result the doubly magic nucleus 100 Sn was identified with 11 events recorded during 44 hours.
Published: 1995

21. Publisher's Note: In-beam spectroscopic studies of the 44S nucleus [Phys. Rev. C 85, 024311 (2012)]

Author: J. C. Angélique, Z. Elekes, O. Sorlin, I. Stefan, S. Iacob, L. Gaudefroy, A. Drouard, F. Nowacki, Zs. Dombrádi, B. Bastin, L. Caceres, P. Roussel-Chomaz, B. Laurent, Robert Chapman, J. C. Dalouzy, F. Azaiez, Ch. Bourgeois, Dóra Sohler, F. Negoita, D. Baiborodin, N. L. Achouri, M. Stanoiu, E. Liénard, M. G. Saint-Laurent, X. Liang, N. A. Orr, Zs. Podolyák, A. Poves, L. Nalpas, A. Buta, S. Franchoo, M. Lazar, S. Grévy, Y. E. Penionzhkevich, Z. Dlouhy, F. Pougheon, J. Mrazek, A. Bürger, R. Borcea, 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), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), 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)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, SHELL model, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, medicine.anatomical_structure, 21.60.Cs, 23.20.Lv, 27.40.+z, 99.10.Fg, 0103 physical sciences, medicine, 010306 general physics, Nucleus, Beam (structure)
Abstract: This paper was published online on 15 February 2012 with errors in Figs. 2 and 4. The figures has been replaced as of 28 February 2012. The figures are correct in the printed version of the journal.
Published: 2012

22. In-beam spectroscopic studies of $^{44}$S nucleus

Author: Dóra Sohler, Z. Elekes, L. Nalpas, Z. Dlouhy, P. Roussel-Chomaz, M. Stanoiu, Frédéric Nowacki, N. L. Achouri, X. Liang, N. A. Orr, A. Bürger, Zs. Podolyák, F. Pougheon, J. C. Angélique, Alfredo Poves, F. Negoita, R. Borcea, A. Drouard, S. Grévy, M. G. Saint-Laurent, E. Liénard, L. Caceres, F. Azaiez, O. Sorlin, I. Stefan, J. Mrazek, S. Iacob, Zs. Dombrádi, Ch. Bourgeois, A. Buta, S. Franchoo, B. Bastin, D. Baiborodin, L. Gaudefroy, R. Chapman, Yu. E. Penionzhkevich, J. C. Dalouzy, B. Laurent, M. Lazar, 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), 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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), UAM. Departamento de Física Teórica, 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), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, 21.60.Cs, 23.20.Lv, 27.40.+z, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, SHELL model, Foundation (engineering), FOS: Physical sciences, Física, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Beam (structure)
Abstract: The structure of the $^{44}$S nucleus has been studied at GANIL through the one proton knock-out reaction from a $^{45}$Cl secondary beam at 42 A$\cdot$MeV. The $\gamma$ rays following the de-excitation of $^{44}$S were detected in flight using the 70 BaF${_2}$ detectors of the Ch\^{a}teau de Cristal array. An exhaustive $\gamma\gamma$-coincidence analysis allowed an unambiguous construction of the level scheme up to an excitation energy of 3301 keV. The existence of the spherical 2$^+_2$ state is confirmed and three new $\gamma$-ray transitions connecting the prolate deformed 2$^+_1$ level were observed. Comparison of the experimental results to shell model calculations further supports a prolate and spherical shape coexistence with a large mixing of states built on the ground state band in $^{44}$S., Comment: 6 pages, 5 figures, accepted for publication in Physical Review C
Published: 2012

23. Exclusive and restricted-inclusive reactions involving the 11Be one-neutron halo

Author: M Keim, P. Møller, D. Guillemaud-Mueller, K. Wilhelmsen Rolander, Björn Jonson, F. Humbert, K. Riisager, F. Pougheon, P. G. Hansen, M. G. Saint-Laurent, R. Bimbot, O. Sorlin, H. Emling, M. Lewitowicz, R. Anne, Thomas Nilsson, S. Dogny, P. Hornshøj, Rainer Neugart, Olof Tengblad, A.C. Mueller, G. Schrieder, Göran Hugo Nyman, 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 reaction, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Halo nucleus, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, 0103 physical sciences, Coulomb, Neutron detection, Neutron, Halo, Nuclear Experiment, 010306 general physics, Wave function, Glauber
Abstract: Reactions of a 41 MeV/u beam of the radioactive halo nucleus Be-11 have been studied with a counter telescope coupled to an array of neutron detectors covering angles up to 97-degrees. The technique allows to determine single-neutron inclusive and exclusive angular distributions. The targets (Be, Ti and Au) were chosen to illustrate the relative roles played by nuclear and Coulomb mechanisms. The channels leading to Be-10, the dissociation channels, correspond to impact parameters larger than the sum of the radii of the target and the Be-10 core. It is shown that for the dissociation process it is possible to account almost quantitatively for the integral, single- and double-differential cross sections from models without free parameters including the Coulomb, Serber and Glauber (diffraction-dissociation) mechanisms. The neutron distributions from the nondissociative reaction channels show little individuality and it is convenient to group them together as the channel ''neutron plus anything different from Be-10''. We refer to these as ''restricted-inclusive'' reactions. These seem to be a promising tool for obtaining accurate information on the halo wave function in momentum coordinates.
Published: 1994

24. Spectroscopy of 39,41Si and the border of the N = 28 island of inversion

Author: S. M. Lukyanov, Ch. Bourgeois, O. Sorlin, X. Liang, I. Stefan, Z. Elekes, J. Mrazek, Zs. Dombrádi, A. Drouard, M. G. St-Laurent, M. Lazar, J. C. Dalouzy, Zs. Podolyák, F. Pougheon, F. Nowacki, Alfredo Poves, N. A. Orr, D. Baiborodin, P. Roussel-Chomaz, S. Grévy, Z. Dlouhy, S. Iacob, István Kuti, L. Caceres, A. Buta, F. Negoita, J. C. Angélique, B. Bastin, S. Franchoo, D. Sohler, L. Gaudefroy, A. Bürger, R. Borcea, L. Nalpas, Yu.E. Penionzkhevitch, F. Azaiez, R. Chapman, N. L. Achouri, E. Liénard, B. Laurent, M. Stanoiu, Noyaux exotiques (NEX), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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)-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), 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), 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), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), 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)-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), 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)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear reaction, Nuclear and High Energy Physics, Astrophysics::High Energy Astrophysical Phenomena, Hadron, Nuclear Theory, Fizikai tudományok, Shell closures, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Knockout reactions, 7. Clean energy, 01 natural sciences, Természettudományok, 0103 physical sciences, Neutron, Isotopes of silicon, Nuclear structure, 010306 general physics, Spectroscopy, Nuclear Experiment, Neutron-rich Si nuclei, Physics, 010308 nuclear & particles physics, Island of inversion, Excited state, Atomic physics, Ground state
Abstract: Expérience GANIL/SISSI/SPEG; International audience; The structure of the very neutron-rich nuclei 39Si and 41Si has been investigated via in-beam γ -ray spectroscopy and few-nucleon knockout from radioactive beams. The observation of low-lying states in 39Si is a clear evidence for a drastic lowering of the intruder neutron 3/2− state when going from Z = 20 to Z = 14. The energy of the only γ -ray transition (672(14) keV) observed in 41Si is significantly lower than that of the first excited state in 47Ca (2014 keV) suggesting a deformed ground state for 41Si. These results are consistent with large-scale shell-model calculations implying that strong proton- neutron correlations are the main reason for the lowering of the intruder configurations over the normal ones.
Published: 2011

25. Elastic scattering of a secondary 11Li beam on 28Si at 29 MeV/nucleon

Author: F. Carstoiu, N. K. Skobelev, R. Bimbot, D. Guillemaud-Mueller, S. P. Tretyakova, S.N. Ershov, V. Borrel, S. Dogny, A.J. Kordyasz, P. Roussel-Chomaz, F.A. Gareev, R. Anne, Z. Dlouhy, M. G. Saint-Laurent, S. M. Lukyanov, J. Svanda, F. Pougheon, M. Lewitowicz, L. Nosek, A.C. Mueller, C. Borcea, Yu. E. Penionzhkevich, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de 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), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear reaction, Elastic scattering, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Inelastic scattering, 01 natural sciences, Nuclear physics, 0103 physical sciences, Woods–Saxon potential, Neutron, 010306 general physics, Nucleon, Beam (structure)
Abstract: The elastic scattering of a secondary 11 Li beam (29 MeV/nucleon) on a 28 Si target has been measured for the first time. To compensate for the low intensity of the secondary beam, an efficient detecting system permitting one to obtain reliable experimental data has been used. An attempt has been made to reproduce the data in a phenomenological analysis and with coupled-channel calculations with a double-folding optical potential, with energy- and density-dependent effective interaction and realistic densities. In coupled-channel calculations with the folding optical potential a better description is achieved if a neutron halo of 11 Li is taken into account.
Published: 1993

26. Decay properties of exoticN≃28 S and Cl nuclei and theCa48/46Ca abundance ratio

Author: M. Lewitowicz, Friedrich-Karl Thielemann, Karl Kratz, Wolfgang Hillebrandt, O. Sorlin, S. M. Lukyanov, C. Borcea, Yu. E. Penionzhkevich, R. Anne, W. Ziegert, S. Dogny, M. G. Saint-Laurent, V. S. Salamatin, A. Wöhr, A.C. Mueller, L.K. Fifield, V. Borrel, B. Pfeiffer, D. Guillemaud-Mueller, H. Gabelmann, D. Bazin, F. Pougheon, and C. Détraz
Subjects: Nuclear physics, Baryon, Physics, Nuclear reaction, Nuclear and High Energy Physics, Hadron, Nuclear structure, Isotopes of chlorine, Neutron, Atomic physics, Nuclear Experiment, Nucleon, Radioactive decay
Abstract: Beta-decay half-lives and \ensuremath{\beta}-delayed neutron-emission probabilities of the very neutron-rich nuclei $^{44}\mathrm{S}$ and $^{45--47}\mathrm{Cl}$ have been measured. These isotopes, which lie at or close to the N=28 magic shell, were produced in interactions of a 60 MeV/u $^{48}\mathrm{Ca}$ beam from GANIL (Grand Acc\'el\'erateur National d'Ions Lourds) with a $^{64}\mathrm{Ni}$ target, and were separated by the doubly achromatic spectrometer LISE (Ligne d'Ions Super Epluch\'es). Their decay was studied by a \ensuremath{\beta}-n time correlation measurement. The results are compared to recent model predictions and indicate a rapid weakening of the N=28 shell effect below $_{20}^{48}\mathrm{Ca}_{28}$. 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 $^{48}\mathrm{Ca}$${/}^{46}$Ca abundance ratio measured in the solar system as well as the Ca-Ti-Cr anomalies observed in E. King inclusions of the Allende meteorite.
Published: 1993

27. Decay modes ofAr31and first observation of β-delayed three-proton radioactivity

Author: F. Pougheon, M.S. Pravikoff, C. Détraz, A. Fleury, J.P. Dufour, M. Lewitowicz, R. Del Moral, F. Hubert, J.C. Jacmart, A.C. Mueller, Y. Zheng, A. Richard, P. Bricault, R. Anne, D. Bazin, and D. Guillemaud-Mueller
Subjects: Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Branching fraction, Hadron, Elementary particle, 01 natural sciences, Beta decay, 0103 physical sciences, High Energy Physics::Experiment, Beta (velocity), Atomic physics, 010306 general physics, Nucleon, Radioactive decay
Abstract: The different {beta}-delayed particle-decay modes of {sup 31}Ar are investigated by means of a new silicon-detector telescope. Identification of {beta}-delayed two-proton decay, and {beta}-delayed three-proton decay observed for the first time, is made possible by Monte Carlo simulations of the detector response. Other {beta}-delayed single-proton branches are also investigated, and none of the energetically allowed {beta}-{alpha} and {beta}-{ital p}{alpha} decay modes are found. Finally, the results of this experiment are compared to shell-model calculations.
Published: 1992

28. In-beam γ-ray spectroscopy of the neutron-rich nitrogen isotopesN19−22

Author: P. Roussel-Chomaz, M. Stanoiu, F. Azaiez, O. Sorlin, B. A. Brown, Zs. Dombrádi, W. Mittig, F. De Oliveira-Santos, Marie-Geneviève Porquet, M. Lewitowicz, János Timár, Yu. E. Penionzhkevich, C. Donzaud, Z. Elekes, S. Leenhardt, F. Negoita, F. Ibrahim, J. C. Angélique, M. G. Saint-Laurent, Zs. Podolyák, C. Stodel, D. Guillemaud-Mueller, H. Savajols, M. J. Lopez-Jimenez, S. M. Lukyanov, Ch. Bourgeois, Josette Duprat, G. Sletten, N. L. Achouri, J. Mrazek, J. M. Daugas, Dóra Sohler, Yu. G. Sobolev, C. Borcea, F. Pougheon, Z. Dlouhy, M. Belleguic, and S. Grévy
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, SHELL model, chemistry.chemical_element, 01 natural sciences, Nitrogen, Molecular physics, Isotopes of nitrogen, Nuclear physics, chemistry, Fragmentation (mass spectrometry), 0103 physical sciences, Neutron, Gamma spectroscopy, Nuclear Experiment, 010306 general physics, Beam (structure)
Abstract: The structure of N19-22 nuclei was investigated by means of in-beam gamma-ray spectroscopic technique using fragmentation reactions of both stable and radioactive beams. Based on particle-gamma and particle-gamma gamma coincidence data, level schemes are constructed for the neutron-rich nitrogen nuclei. The experimental results are compared with shell model calculations. The strength of the N=14 and Z=8 shell closures and the weakening of the shell model interaction WBT are discussed.
Published: 2008

29. Particle stability of the isotopesO26andNe32in the reaction 44 MeV/nucleonCa48+Ta

Author: F. Pougheon, R. Anne, J.C. Jacmart, C. Détraz, Yu. E. Penionzhkevich, W. D. Schmidt-Ott, E. Kashy, D. Guillemaud-Mueller, M. Lewitowicz, A.C. Mueller, Yu. S. Lyutostansky, P. Bricault, S. M. Lukyanov, A. Richard, A. G. Artuhk, M. V. Zverev, A.V. Belozyorov, Y. Zhang, A. Latimier, and D. Bazin
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, Nuclear Theory, Particle stability, 7. Clean energy, 01 natural sciences, Isotopes of oxygen, 0103 physical sciences, Particle, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Radioactive decay, Order of magnitude
Abstract: An attempt has been made to synthesize the extremely neutron-rich isotope $^{26}\mathrm{O}$ in the nuclear reaction 44 MeV/nucleon $^{48}\mathrm{Ca}$+n/rTa. Use was made of magnetic separation and identification methods including time-of-flight and \ensuremath{\Delta}E,E measurements. The $^{26}\mathrm{O}$ nucleus appears to be unstable against particle emission since no events attributable to the $^{26}\mathrm{O}$ nucleus were observed at a level one order of magnitude lower than that predicted from the extrapolated yields. The previously unobserved isotope $^{32}\mathrm{Ne}$ was found to be particle stable and the isotope $^{31}\mathrm{Ne}$ particle unstable. Neutron-separation energies calculated with different models are tabulated.
Published: 1990

30. Low-energy states of3181Ga50: Proton structure of the nuclei close toNi78

Author: S. Gales, F. Ibrahim, F. Le Blanc, Ch. Bourgeois, F. Pougheon, F. Hammache, O. Perru, C. Lau, A.C. Mueller, B. Roussière, O. Sorlin, D. Guillemaud-Mueller, D. Verney, L. Gaudefroy, S. Essabaa, and J. Sauvage
Subjects: Physics, Nuclear and High Energy Physics, Decay scheme, Proton, 010308 nuclear & particles physics, Fission, Nuclear Theory, 7. Clean energy, 01 natural sciences, Deuterium, Excited state, Double beta decay, 0103 physical sciences, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Line (formation)
Abstract: The \ensuremath{\beta} decay of the neutron-rich ${}_{30}^{81}{\mathrm{Zn}}_{51}$ has been investigated at the PARRNe mass separator at the IPN Orsay. The sources of $^{81}\mathrm{Zn}$ were produced using the ISOL (Isotopic Separation On Line) technique by the fission of ${}^{\mathrm{nat}}$U exposed to the neutron flux produced by the 26-MeV deuteron beam delivered by the MP-Tandem. With \ensuremath{\gamma} and $\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}$ coincidence measurements, excited levels were attributed to ${}_{31}^{81}{\mathrm{Ga}}_{50}$ for the first time. A partial decay scheme for $^{81}\mathrm{Zn}$ is proposed. The proposed level scheme is well reproduced by shell model calculations using the most recent effective empirical interaction. We show that the structure of this nucleus is consistent with that of the heavier odd-proton $N=50$ isotones within the assumption of strong proton $Z=28$ and neutron $N=50$ effective shell effects. The observed states can be associated to rather simple and clean configurations of three protons placed in the $1{f}_{5/2}$ and $2{p}_{3/2}$ orbits.
Published: 2007

31. Collapse of theN=28Shell Closure inS42i

Author: M. Lazar, J. C. Dalouzy, F. Nowacki, J. Mrazek, A. Bürger, A. Drouard, M. Stanoiu, I. Stefan, F. Azaiez, F. Pougheon, P. Roussel-Chomaz, B. Bastin, J. C. Angélique, R. Chapman, S. Iacob, Zs. Dombrádi, B. Laurent, N. L. Achouri, R. Borcea, D. Baiborodin, X. Liang, Dóra Sohler, O. Sorlin, E. Liénard, F. Negoita, N. A. Orr, Z. Elekes, M. G. Saint-Laurent, Ch. Bourgeois, Z. Dlouhy, L. Nalpas, S. Grévy, Y. E. Penionzhkevich, Alfredo Poves, Zs. Podolyák, A. Buta, and S. Franchoo
Subjects: Physics, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, SHELL model, General Physics and Astronomy, 01 natural sciences, Spherical shell, Fragmentation (mass spectrometry), Closure (computer programming), Excited state, 0103 physical sciences, Neutron, Gamma spectroscopy, Atomic physics, 010306 general physics, Spectroscopy
Abstract: The energies of the excited states in very neutron-rich Si-42 and P-41,P-43 have been measured using in-beam gamma-ray spectroscopy from the fragmentation of secondary beams of S-42,S-44 at 39A MeV. The low 2(+) energy of Si-42, 770(19) keV, together with the level schemes of P-41,P-43, provides evidence for the disappearance of the Z=14 and N=28 spherical shell closures, which is ascribed mainly to the action of proton-neutron tensor forces. New shell model calculations indicate that Si-42 is best described as a well-deformed oblate rotor.
Published: 2007

32. Enhanced Core Polarization inNi70andZn74

Author: F. Azaiez, S. M. Lukyanov, Ch. Bourgeois, A. Chatillon, C. Donzaud, J. Mrazek, M. Stanoiu, F. de Oliveira Santos, L. Gaudefroy, J. M. Daugas, G. Sletten, F. Pougheon, Y. Le Coz, I. Matea, Ch. Theisen, F. Hammache, M. G. Saint-Laurent, Z. Dlouhy, O. Perru, Yu. E. Penionzhkevich, D. Verney, O. Sorlin, H. Grawe, C. Stodel, F. Ibrahim, Zs. Dombrádi, D. Guillemaud-Mueller, Stephane Grevy, S. Franchoo, F. Nowacki, and E. Bouchez
Subjects: Physics, Proton, 010308 nuclear & particles physics, General Physics and Astronomy, Coulomb excitation, Polarization (waves), 7. Clean energy, 01 natural sciences, Crystallography, Intermediate energy, Atomic orbital, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics
Abstract: The reduced transition probabilities B(E2;0{sup +}{yields}2{sub 1}{sup +}) of the neutron-rich {sup 74}Zn and {sup 70}Ni nuclei have been measured by Coulomb excitation in a {sup 208}Pb target at intermediate energy. These nuclei have been produced at Grand Accelerateur National d'Ions Lourds via interactions of a 60A MeV {sup 76}Ge beam with a Be target. The B(E2) value for {sup 70}Ni{sub 42} is unexpectedly large, which indicates that neutrons added above N=40 strongly polarize the Z=28 proton core. In the Zn isotopic chain, the steep rise of B(E2) values beyond N=40 continues up to {sup 74}Zn{sub 44}. The enhanced proton core polarization in {sup 70}Ni is attributed to the monopole interaction between the neutron in the g{sub 9/2} and protons in the f{sub 7/2} and f{sub 5/2} spin-orbit partner orbitals. This interaction could result in a weakening of magicity in {sup 78}Ni{sub 50}.
Published: 2006

33. Study of the $N=50$ major shell effect close to $^{78}$Ni : First evidence of a weak coupling structure in $^{83}_{32}$Ge$_{51}$ and three-proton configuration states in $^{81}_{31}$Ga$_{50}$

Author: D. Guillemaud-Mueller, O. Bajeat, F. Ibrahim, C. Donzaud, S. Gales, B. Roussière, O. Perru, L. Gaudefroy, F. Le Blanc, S. Essabaa, C. Lau, J. Sauvage, A.C. Mueller, Ch. Bourgeois, H. Lefort, F. Pougheon, F. Hammache, O. Sorlin, D. Verney, M. Ducourtieux, 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: History, Proton, Fission, Band gap, Shell (structure), Structure (category theory), FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Education, 0103 physical sciences, Nuclear structure, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, 21.60.Cs, 23.20.Lv, 27.50.+e, Nuclear shell model, Coupling (probability), Computer Science Applications, nuclear shell model, magic numbers, Atomic physics, beta-decay
Abstract: New levels were attributed to $^{81}\_{31}$Ga$\_{50}$ and $^{83}\_{32}$Ge$\_{51}$ which were fed by the $\beta$-decay of their respective mother nuclei $^{81}\_{30}$Zn$\_{51}$ and $^{83}\_{31}$Ga$\_{52}$ produced by fission at the "PARRNe" ISOL set-up installed at the Tandem accelerator of the Institut de Physique Nucl\'eaire, Orsay. We show that the low energy structure of $^{81}\_{31}$Ga$\_{50}$ and $^{83}\_{32}$Ge$\_{51}$ can easily be explained within the natural hypothesis of a strong energy gap at N=50 and a doubly-magic character for $^{78}$Ni., Comment: 2 pages, pdf file, To be published in the Proceedings of "International Symposium on Structure of Exotic Nuclei and Nuclear Forces (SENUF 06)", March 2006, Tokyo, Japan
Published: 2006

34. Release of Kr, Ag, Sn, I and Xe from UC$_x$ targets

Author: J. Sauvage, N. Pauwels, E. Cottereau, A. Wojtasiewicz, C. Lau, O. Bajeat, A. C. Mueller, S. Essabaa, F. Clapier, C. Bourgeois, D. Verney, B. Roussière, C. Donzaud, F. Ibrahim, C.F. Liang, N. Barré, D. Guillemaud-Mueller, F. Pougheon, J. Obert, J. Proust, M. Ducourtieux, O. Sorlin, H. Lefort, J.C. Potier, F. Le Blanc, 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), and Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM)
Subjects: Nuclear and High Energy Physics, 25.85.Ec, 29.25.Rm, 29.30.Kv, 010308 nuclear & particles physics, Chemistry, Radiochemistry, Plasma, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Release time, Ion source, 0103 physical sciences, Diffusion (business), Uranium carbide targets, 010306 general physics, Instrumentation, Radioactive beams
Abstract: NESTER ACC; The release properties of a UCx thick target associated with a hot plasma ion source have been studied. Measurements have been performed for various elements: Kr, Ag, Sn, I and Xe. The analysis is made assuming pure diffusion or pure effusion as the release processes. The results obtained are compared to the data available in the literature.
Published: 2006

35. Search for neutron excitations across theN=20shell gap inNe25−29

Author: C. Donzaud, Marie-Geneviève Porquet, S. Grévy, J. C. Angélique, Yutaka Utsuno, N. L. Achouri, S. M. Lukyanov, János Timár, Z. Dlouhy, M. Belleguic, W. Mittig, Ch. Bourgeois, S. Leenhardt, Takaharu Otsuka, F. Pougheon, P. Roussel-Chomaz, M. Lewitowicz, F. De Oliveira-Santos, Dóra Sohler, M. G. Saint-Laurent, Y. Sobolev, J. M. Daugas, C. Borcea, Yu. E. Penionzhkevich, F. Azaiez, Z. Elekes, Josette Duprat, O. Sorlin, H. Savajols, M. J. Lopez-Jimenez, D. Guillemaud-Mueller, Zs. Dombrádi, C. Stodel, and M. Stanoiu
Subjects: Physics, Nuclear and High Energy Physics, Valence (chemistry), Isotope, 010308 nuclear & particles physics, Nuclear Theory, SHELL model, Nuclear structure, 01 natural sciences, 0103 physical sciences, Neutron, Gamma spectroscopy, Atomic physics, Nuclear Experiment, 010306 general physics, Spectroscopy, Excitation
Abstract: Nuclear structure of the neutron rich {sup 25-29}Ne nuclei has been investigated through the in-beam {gamma}-ray spectroscopy technique using fragmentation reactions of both stable and radioactive beams. Level schemes have been deduced for these Ne isotopes. In order to examine the importance of intruder fp configurations, they are compared to shell model calculations performed either in the restricted sd or in the larger sdpf valence space. The {sup 25,26}Ne and {sup 27}Ne nuclei were found to be in agreement with the sd shell model calculations, whereas {sup 28}Ne exhibits signatures of the intruder fp shell contribution.
Published: 2005

36. UCX TARGET DESIGN FOR THE SPIRAL 2 PROJECT AND THE ALTO PROJECT

Author: S. Franchoo, B. Roussière, J. Sauvage, F. Pougheon, M. Ducourtieux, M. G. Saint-Laurent, P. Lecomte, F. Ibrahim, S. Essabaa, C. Phan Viet, F. Pellemoine, G. Gaubert, N. Lecesne, M. Mirea, M. Cheikh Mahmed, H. Lefort, F. Azaiez, Ch. Bourgeois, R. Fifi, H. Croizet, D. Ridikas, C. Lau, D. Verney, F. Nizery, R. Leroy, R. V. Ribas, F. Leblanc, Y. Huguet, Jc. Potier, and O. Bajeat
Subjects: Engineering drawing, Engineering, business.industry, Spiral (railway), business
Published: 2005

37. Beta-decay studies of neutron-rich Sc-Cr nuclei

Author: Yu. E. Penionzhkevich, F. Ibrahim, L. Gaudefroy, M. G. Saint-Laurent, F. de Oliveira Santos, F. Nowacki, F. Pougheon, O. Sorlin, J. C. Angélique, I. Matea, M. Lewitowicz, C. Bourgeois, Karl Kratz, J. Mrasek, S. M. Lukyanov, B. Pfeiffer, S. Grévy, M. Stanoiu, V. Chiste, D. Guillemaud-Mueller, Z. Dlouhy, F. Azaiez, C. Donzaud, 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), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre 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), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), 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), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and 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)
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Branching fraction, Analytical chemistry, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Beta decay, Isotopes of vanadium, Excited state, 0103 physical sciences, Neutron, Gamma spectroscopy, 27.50.+e 59 < A < 89 - 23.40.-s beta decay, double beta decay, electron and muon capture - 21.60.Cs Shell model, Atomic physics, 010306 general physics, Spectroscopy, Radioactive decay
Abstract: The neutron-rich nuclei 2157, 58Sc, 2258-60Ti, 2360-63V, 2462-66Cr have been produced at Ganil via interactions of a 61.8A MeV 76Ge beam with a 58Ni target. Beta-decay studies have been performed using combined β- and γ-ray spectroscopy. Half-lives have been determined and β-decay schemes are proposed for 58Ti, 61V and 62Cr. From these studies, new hints for the existence of β-decaying isomers in 60V and in 62Mn are provided. These results are compared to shell model calculations. The role of the πf7/2- νf5/2 proton-neutron interaction is examined through its influence on the lifetime values.
Published: 2005

38. Spectroscopy at N=28 New evidences of deformation

Author: P. Baumann, G. Canchel, P. Dessagne, S. Courtin, G. Lhersonneau, F. Maréchal, J. M. Daugas, C. Borcea, C. N. Timis, F. de Oliveira, J.L. Lecouey, A. Buta, E. Poirier, J. C. Angélique, Ch. Miehé, François-René Lecolley, J. Mrazek, K. L. Kratz, M. Lewitowicz, S. Pietri, N. A. Orr, M. Stanoiu, B. Pfeiffer, A. Knipper, E. Liénard, C. Stodel, Jean Péter, O. Sorlin, I. Stefan, S. Lukianov, W. N. Catford, F. Negoita, Z. Dlouhy, D. Guillemaud Mueller, D. Pantelica, S. Grévy, Y. E. Penionzhkevich, F. Pougheon, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), 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), Yu. E. Penionzhkevich, E.A. Cherepanov, Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Materials science, Composite material, Deformation (meteorology), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Spectroscopy
Abstract: NESTER
Published: 2004

39. N=14 and 16 shell gaps in neutron-rich oxygen isotopes

Author: A. D. Yamamoto, F. Becker, F. Azaiez, F. Negoita, Yu. G. Sobolev, A. Krasznahorkay, C. Borcea, J. C. Angélique, S. Leenhardt, F. De Oliveira-Santos, O. Sorlin, Z. Dlouhý, B. A. Brown, F. Pougheon, W. Mittig, G. Sletten, P. Mayet, C. Stodel, Yu. E. Penionzhkevich, C. Donzaud, J. Duprat, János Timár, Marie-Geneviève Porquet, D. Guillemaud-Mueller, M. G. Saint Laurent, Andras Kerek, Dóra Sohler, Zs. Fülöp, Zs. Dombradi, S. K. Mandal, P. Roussel-Chomaz, M. Belleguic, C. Bourgeois, S. Grévy, Zs. Podolyák, M. Stanoiu, A. Bracco, H. van der Marel, M. Lewitowicz, S. M. Lukyanov, J. Mrazek, J. M. Daugas, N. L. Achouri, H. Savajols, M. J. Lopez-Jimenez, F. Ibrahim, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de 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), 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), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), 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 Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, 23.20.Lv, 21.60.Cs, 27.20.+n, 27.30.+t, Astrophysics::High Energy Astrophysical Phenomena, SHELL model, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Isotopes of oxygen, Fragmentation (mass spectrometry), Excited state, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Spectroscopy, Nuclear Experiment
Abstract: In-beam gamma-ray spectroscopy using fragmentation reactions of both stable and radioactive beams has been performed in order to study the structure of excited states in neutron-rich oxygen isotopes with masses ranging from A=20 to 24. For the produced fragments, gamma-ray energies, intensities, and gamma-gamma coincidences have been measured. Based on this information new level schemes are proposed for O-21,O-22 up to the neutron separation energy. The nonobservation of any gamma-decay branch from O-23 and O-24 suggests that their excited states lie above the neutron decay thresholds. From this, as well as from the level schemes proposed for O-21 and O-22, the size of the N=14 and 16 shell gaps in oxygen isotopes is discussed in the light of shell-model calculations.
Published: 2004

40. Structure of the neutron-rich $^{37,39}$P and $^{43,45}$Cl nuclei

Author: L. Gaudefroy, C. Borcea, Ch. Theisen, V. A. Maslov, C. Moore, D. Sohler, F. Ibrahim, O. Sorlin, C. Bourgeois, F. Pougheon, G. Sletten, F. Amorini, J. Mrazek, D. Guillemaud-Mueller, M. Stanoiu, F. Azaiez, F. Becker, C. Stodel, J. Timár, M. G. Saint-Laurent, S. M. Lukyanov, J.A. Scarpaci, Z. Dlouhy, R. Lucas, M. Belleguic, Josette Duprat, D. Baiborodin, Zs. Dombrádi, C. Donzaud, F. Sarazin, F. Nowacki, Michael Taylor, Yu. E. Penionzhkevich, M. J. Lopez, A. Bauchet, 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), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), 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, SHELL model, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Atomic orbital, 0103 physical sciences, 21.10.Hw - 23.20.Lv - 27.40+z - 21.60.Cs, Neutron, Atomic physics, 010306 general physics, Spectroscopy
Abstract: The structure of the neutron-rich odd-even nuclei 37, 39 15P 22,24 and 43, 45 17Cl 26,28 nuclei has been investigated through in-beam γ-ray spectroscopy using the fragmentation of a 60.3 A . MeV 48Ca beam on a thin Be target. Level schemes as well as spin assignments are proposed for the nuclei studied in the present work. The experimental data are compared to shell model calculations and related to the onset of collectivity within the sd orbitals around N = 28.
Published: 2004

41. Study of neutron rich Carbon and Oxygen nuclei up to drip line

Author: Y. Sobolev, F. De Oliveira-Santos, H. Savajols, József Tímár, D. Sohler, M. Stanoiu, A. Bracco, M. G. Saint Laurent, C. Bourgeois, A. D. Yamamoto, B. A. Brown, W. Mittig, S. M. Lukyanov, C. Borcea, Zs. Podolyák, S. Grévy, F. Negoita, Z. Dlouhý, Y. E. Penionzhkevich, A. Krasznahorkay, M. Lewitowicz, C. Donzaud, Zs. Fülöp, M. Belleguic, F. Pougheon, Zs. Dombrádi, P. Mayet, C. Stodel, D. Guillemaud-Mueller, Andras Kerek, P. Roussel-Chomaz, S. K. Mandal, O. Sorlin, J. Mrazek, F. Azaiez, F. Ibrahim, G. Sletten, J. M. Daugas, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, SHELL model, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Oxygen, Nuclear physics, chemistry, Fragmentation (mass spectrometry), Isotopes of carbon, Excited state, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Nuclear Experiment
Abstract: NESTER; In-beam$\ gamma$-spectroscopy using fragmentation reactions of radioactive beams have been performed in order to study the structure of excited states in neutron rich oxygen and carbon isotopes. For the produced fragments, $\gamma$-ray energies, intensities and $\gamma-gamma$ coincidences have been measured. The experiment was performed at GANIL. New $\gamma$-lines have been identified and placed in level schemes for $^{17-20}$C. The non observation of any $\gamma$-ray in $^{}$O suggests that their first excited states lie above the neutron threshold. These results are discussed in the framework of shell model calculations.
Published: 2003

42. Study of $^{19}$Na at SPIRAL

Author: F. de Oliveira Santos, P. Himpe, M. Lewitowicz, I. Stefan, N. Smirnova, N. L. Achouri, J. C. Angélique, C. Angulo, L. Axelsson, D. Baiborodin, F. Becker, M. Bellegui, E. Berthoumieux, B. Blank, C. Borcea, A. Cassimi, J. M. Daugas, G. de France, F. Dembinski, C. E. Demonchy, Z. Dlouhy, P. Dolégiéviez, C. Donzaud, G. Georgiev, L. Giot, S. Grévy, D. Guillemaud Mueller, V. Lapoux, E. Liénard, M. J. Lopez Jimenez, K. Markenroth, I. Matea, W. Mittig, F. Negoita, G. Neyens, N. Orr, F. Pougheon, P. Roussel Chomaz, M. G. Saint Laurent, F. Sarazin, H. Savajols, M. Sawicka, O. Sorlin, M. Stanoiu, C. Stodel, G. Thiamova, D. Verney, A. C. C. Villari, 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), Arnould M. Lewitowicz M. Munzenberg G. Akimune H. Ohta M. Utsunomiya H. Wada T. Yamagata T., SPIRAL, 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), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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), Maglione E. Soramel F., Lion, Michel, Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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), Centre Interdisciplinaire de Recherche Ions Lasers (CIRIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), 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), S.V. Harissopulos, P. Demetriou, R. Julin, and Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear and High Energy Physics, Proton, Hydrogen, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], chemistry.chemical_element, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Neon, proton-nucleus reactions, nuclei with mass number 6 to 19, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, medicine, Nuclear fusion, neon, 010306 general physics, Nuclear Experiment, sodium, Spiral, Physics, Excitation function, Elastic scattering, 27.20+n, 25.40.Cm, 25.40.Ep, 25.60.-t, Condensed matter physics, 010308 nuclear & particles physics, Nuclear shell model, Resonance, 020206 networking & telecommunications, 27.20.+n, 25.40.Cm, medicine.anatomical_structure, chemistry, Excited state, Physics::Accelerator Physics, 020201 artificial intelligence & image processing, Atomic physics, Nucleus, Beam (structure)
Abstract: GANIL E400S, NIM; The excitation function for the elastic scattering reaction p($^{18}$Ne,p)$^{18}$Ne was measured with the first radioactive beam from the SPIRAL facility at the GANIL laboratory and with a solid cryogenic hydrogen target. Several broad resonances were observed, corresponding to new excited states in the unbound nucleus $^{19}$Na. In addition, the break-up reaction p($^{18}$Ne,2p)$^{17}$F was observed and is discussed.
Published: 2003

43. Beta decay studies of neutron-rich $_{21}$Sc-$_{27}$Co nuclei at GANIL

Author: L. Gaudefroy, F. Nowacki, J. Mrasek, F. Ibrahim, D. Guillemaud-Mueller, S. M. Lukyanov, S. Grévy, C. Bourgeois, F. de Oliveira Santos, F. Azaiez, Z. Dlouhy, M. Lewitowicz, J. C. Angélique, Karl Kratz, C. Donzaud, F. Pougheon, Yu. E. Penionzhkevich, O. Sorlin, B. Pfeiffer, M. Stanoiu, M. G. Saint-Laurent, 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), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), 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)-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)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Robert, Suzanne
Subjects: Physics, Nuclear and High Energy Physics, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], 010308 nuclear & particles physics, Nuclear structure, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Beta decay, Nuclear physics, Meteorite, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Beam (structure), ComputingMilieux_MISCELLANEOUS
Abstract: The neutron-rich nuclei 2157,58Sc, 2258–60Ti, 2258–60Ti, 2360–62V, 2464–66Cr, 2564–68Mn, 2667–70Fe and 2769–71Co have been produced at Ganil via interactions of a 61.8 A.MeV 76Ge beam with a 58Ni target. Beta-decay studies have been achieved, bringing new half-lives and a better nuclear structure knowledge in this region. These results could help for understanding the overabundances of the neutron-rich stable 58Fe, 64Ni in certain inclusions of meteorites.
Published: 2002

44. PHOTO-FISSION FOR THE PRODUCTION OF RADIOACTIVE BEAMS: EXPERIMENTAL DATA FROM AN ON-LINE MEASUREMENT

Author: F. IBRAHIM, O. BAJEAT, J. M. BUHOUR, F. CLAPIER, C. DONZAUD, J. M. DUFOUR, M. DUCOURTIEUX, S. ESSABAA, S. GALÈS, D. GUILLEMAUD-MUELLER, F. HOSNI, O. HUBERT, C. LAU, H. LEFORT, A. C. MUELLER, J. OBERT, N. PAUWELS, O. PERRU, J. C. POTIER, J. PROUST, F. POUGHEON, O. SORLIN, D. VERNEY, A. JOINET, U. KÖSTER, G. LE SCORNET, J. LETTRY, A. MULLER, H. RAVN, L. RINOLFI, G. ROSSAT, M. SANTANA-LEITNER, M. G. SAINT LAURENT, H. SAFA, and M. MIREA
Subjects: Nuclear physics, Materials science, Fission, Experimental data, Line (text file)
Published: 2002

45. N2868i40: Magicity versus Superfluidity

Author: F. Nowacki, F. de Oliveira Santos, S. Leenhardt, D. M. Cullen, M. Stanoiu, Roy Crawford Lemmon, F. Azaiez, A. Astier, C. Borcea, M. G. Saint-Laurent, Oleg B. Tarasov, N. Redon, O. Sorlin, Ch. Theisen, Zs. Dombrádi, Yu. E. Penionzhkevich, D. Baiborodin, F. Amorini, D. Guillemaud-Mueller, H. Grawe, B. Herskind, G.B. Hagemann, J. Kiener, M. Górska, Josette Duprat, Z. Dlouhy, M. Belleguic, G. Sletten, F. Pougheon, P. Mayet, Alfredo Poves, S. Grévy, D. Pantalica, C. Donzaud, J. A. Scarpaci, M. Lewitowicz, S. M. Lukyanov, Ch. Bourgeois, and E. Dragulescu
Subjects: Physics, Proton, 010308 nuclear & particles physics, Scattering, SHELL model, General Physics and Astronomy, Coulomb excitation, 7. Clean energy, 01 natural sciences, Superfluidity, Intermediate energy, 0103 physical sciences, Atomic physics, 010306 general physics
Abstract: The neutron-rich ${}^{66,68}\mathrm{Ni}$ have been produced at GANIL via interactions of a $65.9A\mathrm{MeV}$ ${}^{70}\mathrm{Zn}$ beam with a ${}^{58}\mathrm{Ni}$ target. Their reduced transition probability $B({E2;0}_{1}^{+}\ensuremath{\rightarrow}{2}^{+})$ has been measured for the first time by Coulomb excitation in a ${}^{208}\mathrm{Pb}$ target at intermediate energy. The $B(E2)$ value for ${}^{68}{\mathrm{Ni}}_{40}$ is unexpectedly small. An analysis in terms of large scale shell model calculations stresses the importance of proton core excitations to reproduce the $B(E2)$ values and indicates the erosion of the $N\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}40$ harmonic-oscillator subshell by neutron-pair scattering.
Published: 2002

46. Coulomb excitation of $^{72}_{30}$Zn$_{42}$

Author: S. Leenhardt, I. Deloncle, J. M. Daugas, S. M. Lukyanov, F. Azaiez, Jürgen Kiener, Yu. E. Penionzhkevich, C. Bourgeois, D. Guillemaud-Mueller, J. S. Winfield, Yu. Sobolev, M. Lewitowicz, M. G. Saint-Laurent, F. de Oliveira Santos, M. Belleguic, S. Grévy, F. Pougheon, C. Borcea, J. C. Angélique, C. Donzaud, W. Shuying, J. Duprat, O. Sorlin, F. Marie, N. A. Orr, M.G. Porquet, A. Gillibert, 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), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), 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), 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), 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: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Hadron, Function (mathematics), Coulomb excitation, Deformation (meteorology), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, medicine.anatomical_structure, Intermediate energy, 0103 physical sciences, medicine, Nuclear fusion, Atomic physics, 010306 general physics, Nucleus, ComputingMilieux_MISCELLANEOUS
Abstract: The reduced transition probability B(E2: 01 +→ 2+) of 72Zn has been measured for the first time by Coulomb excitation at intermediate energy. The result B(E2: 01 +→ 2+) = 1740±210 e2fm4, corresponds to the deformation parameter β2 of 0.23, in close agreement with expectations derived from the neighboring nucleus 73Zn. A discussion of the evolution of the N = 40 sub-shell closure as a function of Z is presented.
Published: 2002

47. COULOMB EXCITATION OF NI AND ZN ISOTOPES AROUND THE N=40 SUBSHELL CLOSURE

Author: C. Borcea, Z. Dlouhy, M. Belleguic, A. Astier, M. G. Saint-Laurent, E. Dragulescu, O. Sorlin, Oleg B. Tarasov, S. Grévy, C. Donzaud, S. Leenhardt, Zs. Dombrádi, F. Pougheon, P. Mayet, D. Baiborodin, F. Azaiez, J. A. Scarpaci, F. Amorini, Roy Crawford Lemmon, G. Sletten, M. Lewitowicz, S. M. Lukyanov, Ch. Bourgeois, L. Petizon, D. Pantalica, J. Kiener, D. Guillemaud-Mueller, G.B. Hagemann, Ch. Theisen, I. Deloncle, D. M. Cullen, M. Stanoiu, M. G. Porquet, Yu. E. Penionzhkevich, F. de Oliveira Santos, N. Redon, K. Bienczak, H. Brenning, H. Grawe, B. Herskind, M. Górska, and Josette Duprat
Subjects: Nuclear physics, Physics, Isotope, Closure (topology), Coulomb excitation, Atomic physics
Published: 2002

48. Photofission for the production of radioactive beams: experimentral data from an on-line measurement

Author: O. Bajeat, J. Proust, O. Sorlin, M. Mirea, F. Ibrahim, H. Safa, F. Pougheon, O. Perru, A.C. Mueller, G. Le Scornet, M. G. Saint Laurent, J. Obert, C. Lau, D. Carminati, Jacques Lettry, C. Donzaud, M. Ducourtieux, J.M. Buhour, F. Hosni, Louis Rinolfi, A. Joinet, J.C. Potier, N. Pauwels, H.L. Ravn, F. Clapier, Ulli Köster, M. Santana-Leitner, S. Essabaa, J.M. Dufour, S. Galès, D. Verney, D. Guillemaud-Mueller, G. Rossat, H. Lefort, O. Hubert, 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, Large Hadron Collider, 010308 nuclear & particles physics, Fission, Nuclear Theory, Photofission, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, 0103 physical sciences, Cathode ray, Physics::Accelerator Physics, Nuclear fusion, Neutron, Nuclear Experiment, 010306 general physics, Line (formation)
Abstract: A PARRNe 1 experiment (Production d'Atomes Radioactifs Riches en Neutrons) aimed at the production of neutron-rich radioactive noble gases produced by photofission has been performed at CERN. The LEP Pre-Injector (LPI) has been used to deliver a 50 MeV electron beam. The results obtained show clearly that the use of an electron beam to produce neutron-rich fission fragments for futur RNB facilities is an option that should not be neglected.
Published: 2002

49. Experimental evidence for particle stability of ${34}^Ne$ and ${37}^Na$

Author: A.C. Mueller, G. Faivre, C. Cauvin, J. Mrazek, S. P. Lobastov, R. A. Astabatyan, Yu. Sobolev, O. Sorlin, I. Matea, M. Lewitowicz, C. Borcea, Z. Dlouhý, S. Grévy, R. Anne, S. M. Lukyanov, F. Negoita, A Buta, F. Pougheon, O Perru, Georgi P. Georgiev, R. Hue, Yu. E. Penionzhkevich, D. Guillemaud-Mueller, F. de Oliveira Santos, D. Verney, I. Stefan, F. Ibrahim, D. Baiborodin, 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), 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 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: Nuclear reaction, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Nuclear Theory, Cyclotron, Nuclear structure, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Isotopes of sodium, 7. Clean energy, 01 natural sciences, Instability, law.invention, Nuclear physics, Isotopes of neon, law, 0103 physical sciences, Physics::Atomic Physics, Nuclear drip line, Nuclear Experiment, 010306 general physics, Beam (structure), Nuclear Physics
Abstract: The neutron drip line in a neon–magnesium region has been explored by the projectile fragmentation of a 59.8 A MeV 48Ca beam using the new fragment separator LISE 2000 at GANIL. New neutron-rich isotopes, 34Ne and 37Na, have been observed together with some evidence for the particle instability of 33Ne and 36Na.
Published: 2002

50. Future prospects on RNB production using photo fission

Author: O. Bajeat, M. Ducourtieux, J.M. Buhour, C. Donzaud, G. Rossat, J. Obert, D. Verney, H. Lefort, O. Hubert, M. Santana-Leitner, J. Proust, H. Safa, O. Perru, A.C. Mueller, J.M. Dufour, S. Galès, F. Pougheon, U. Koester, D. Guillemaud-Mueller, A. Joinet, N. Pauwels, D. Carminati, H.L. Ravn, F. Hosni, F. Ibrahim, S. Essabaa, F. Clapier, O. Sorlin, J.C. Potier, M. Mirea, G. Le Scornet, J. Lettry, M. G. Saint Laurent, C. Lau, Louis Rinolfi, 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), and Aeystoe J. Dendooven P. Jokinen A. Leino M.
Subjects: Physics, Radioactive ion beams, Large Hadron Collider, 010308 nuclear & particles physics, Fission, Nuclear engineering, 0103 physical sciences, Photon beams, Neutron, 010306 general physics, 01 natural sciences, 7. Clean energy
Abstract: The PARRNe (Production d’Atomes Radioactifs Riches Neutrons) R&D program is dedicated to the determination of the best conditions for the production of neutron-rich beam in prospect of the SPIRAL2 project. A complete description of this program, its subdivisions (PARRNe 0, 1 and 2 sub-programs) and the different experimental setup involved can be found in [1,2]. An experiment using the “PARRNE 1” procedure aimed at measuring on-line production of rare gases was performed at CERN.
Published: 2001

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