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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
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2. 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
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3. 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
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4. Halo Structure ofB14e

Author: M. J. Lopez, S. Leenhardt, B. Benoit, N. Curtis, L. Axelsson, M. J. G. Borge, Thomas Nilsson, L. Stuttge, Giovanni Fazio, D. Guillemaud-Mueller, O. Sorlin, E. de Goes Brennand, F. Sarazin, F. M. Marqués, C. Le Brun, Graziele De Sousa Costa, B. R. Fulton, K. Riisager, A. D'Arrigo, G. Giardina, J. C. Angélique, M. Lewitowicz, N. M. Clarke, S. M. Singer, O. Dorvaux, W. N. Catford, M. Labiche, Björn Jonson, S. Grévy, F. Hanappe, S. P. G. Chappell, I. Piqueras, N. A. Orr, B. Heusch, F. de Oliveira, K. L. Jones, Gunnar Nyman, Karin Markenroth, M. G. Saint Laurent, A.C. Mueller, Alain Ninane, U. C. Bergmann, and Martin Freer
Subjects: Physics, 010308 nuclear & particles physics, Nuclear Theory, General Physics and Astronomy, Halo nucleus, 01 natural sciences, Dissociation (chemistry), Spectral line, 0103 physical sciences, Invariant mass, Neutron, Halo, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Excitation
Abstract: The two-neutron halo nucleus (14)Be has been investigated in a kinematically complete measurement of the fragments ((12)Be and neutrons) produced in dissociation at 35 MeV/nucleon on C and Pb targets. Two-neutron removal cross sections, neutron angular distributions, and invariant mass spectra were measured, and the contributions from electromagnetic dissociation (EMD) were deduced. Comparison with three-body model calculations suggests that the halo wave function contains a large nu(2s(1/2))(2) admixture. The EMD invariant mass spectrum exhibited enhanced strength near threshold consistent with a nonresonant soft-dipole excitation.
Published: 2001
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5. Exotic nuclei produced by fast neutrons in a liquid uranium target

Author: J. Obert, G. Lalu, B. Roussière, J. A. Scarpaci, E. Cottereau, T. von Egidy, S. Kandri-Rody, C. F. Liang, N. Pauwels, J. Proust, H.L. Ravn, C. Lau, J. Lettry, O. Bajeat, F. Clapier, F. Le Blanc, J.C. Putaux, M. Ducourtieux, I. Lhenry, A.C. Mueller, P. Paris, R. Antoni, J. Sauvage, J.C. Potier, H. Lefort, 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, Isotopes of uranium, 010308 nuclear & particles physics, Chemistry, Radiochemistry, chemistry.chemical_element, Fission product yield, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Uranium, 01 natural sciences, Fast fission, Neutron temperature, Nuclear physics, Uranium-238, 0103 physical sciences, Boosted fission weapon, Uranium-235, 010306 general physics, Instrumentation
Abstract: The latest results of the research and development program Production d'Atomes Radioactifs Riches en Neutrons (PARRNe) at Institut de Physique Nucleaire (IPN) Orsay are presented. The production of neutron rich isotopes by fast neutron induced fission in a liquid depleted uranium target was measured. A comparison of the production rates with a uranium carbide (UCx) target is given.
Published: 2000
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6. Study of μs-isomers in neutron-rich nuclei around Z=28 and N=40 shell closures

Author: K. L. Jones, A. Nowak, Robert Grzywacz, W. Trinder, W. N. Catford, S. Viteritti, M. Houry, M. Glogowski, M. Sawicka, M. G. Saint-Laurent, J. C. Angélique, G. Sletten, J. Szerypo, R. Bentida, L. Achouri, A.C. Mueller, A. Płochocki, O. Sorlin, J. M. Daugas, C. Borcea, M. Stanoiu, D. Baiborodin, J. S. Winfield, M. Pfützner, K. Rykaczewski, A. Emsallem, M. Schaefer, R.C. Lemmon, P. H. Regan, D. Guillemaud-Mueller, R. Béraud, S. Hurskanen, J. E. Sauvestre, H. Grawe, F. De Oliveira-Santos, C. R. Bingham, M. Lewitowicz, 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 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), 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), 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 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 Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, 0103 physical sciences, Shell (structure), Neutron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences
Abstract: NESTER
Published: 1999
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7. 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
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8. New isotopes and isomers produced by the fragmentation of U at 1000 MeV/nucleon

Author: M. Górska, F. de Oliviera, Thomas Baumann, S. Leenhardt, D. Cortina-Gil, P. Armbruster, P. H. Regan, H. Grawe, J. Benlliure, M. Rejmund, M. Karny, M. Bernas, W. N. Catford, Robert Grzywacz, Arnd R. Junghans, K. Sümmerer, A.C. Mueller, Margareta Hellström, J. M. Daugas, Hans Geissel, Naohito Iwasa, K. P. Rykaczewski, M. Lewitowicz, M. Pfützner, and Z. Janas
Subjects: Physics, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, chemistry.chemical_element, 01 natural sciences, 7. Clean energy, Nuclear physics, chemistry, Fragmentation (mass spectrometry), 0103 physical sciences, Beryllium, 010306 general physics, Nucleon
Abstract: Seven previously unobserved neutron-rich isotopes ( 209 Hg, 210 Hg, 211 Tl, 212 Tl, 218 Bi, 219 Po and 220 Po) have been identified among the fragmentation products of a 1000 MeV/nucleon 238 U beam incident on a beryllium target. The γ -ray decays of 9 known and 4 new μ s-isomers in nuclei around 208 Pb were also observed. Production cross sections and probabilities for populating isomeric states in the fragmentation reaction were determined and compared with a simple model based on the statistical abrasion-ablation approach.
Published: 1998
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9. New Island ofμsIsomers in Neutron-Rich Nuclei around theZ=28andN=40Shell Closures

Author: A. Płochocki, Andrzej Nowak, M. Pfützner, D. Guillemaud-Mueller, S. Viteritti, M. G. Saint-Laurent, J. Szerypo, K. P. Rykaczewski, M. Glogowski, H. Grawe, Morten Hjorth-Jensen, M. Lewitowicz, M. Houry, W. Trinder, J. E. Sauvestre, O. Sorlin, R. Béraud, Robert Grzywacz, A.C. Mueller, C. Borcea, J. S. Winfield, A. Emsallem, and M. Schaefer
Subjects: Nuclear physics, Physics, 010308 nuclear & particles physics, 0103 physical sciences, Shell (structure), General Physics and Astronomy, Neutron, Atomic physics, 010306 general physics, 01 natural sciences
Published: 1998
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10. 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
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11. 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
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12. Ra223nuclear spectroscopy inC14cluster radioactivity

Author: L. H. Rosier, H.L. Ravn, D. N. Poenaru, A. Elayi, E. Hourany, A. Liebe, A.C. Mueller, G. Rotbard, G. Renou, G. Berrier-Ronsin, and P. Hoffmann-Rothe
Subjects: Physics, Nuclear and High Energy Physics, Cluster decay, Spectrometer, 010308 nuclear & particles physics, 01 natural sciences, Ion, Excited state, 0103 physical sciences, Cluster (physics), Atomic physics, 010306 general physics, Wave function, Ground state, Energy (signal processing)
Abstract: The energy spectrum of $^{14}\mathrm{C}$ ions emitted from $^{223}\mathrm{Ra}$ sources implanted at ISOLDE has been measured with the spectrometer SOLENO. The highest statistics (899 events) and the best energy resolution (90 keV) obtained so far in cluster decay allow a real spectroscopic study. Hindrance factors for transitions to the ground state and first excited state in $^{209}\mathrm{Pb}$, and limits for the next three low-lying states, hae been determined. The data can be explained by a parent wave function containing mainly a ${\mathit{i}}_{11/2}$ spherical component.
Published: 1995
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13. Quasielastic scattering ofB8andBe7onC12at 40 MeV/nucleon

Author: D. Bazin, F. Carstoiu, M. Lewitowicz, Z. Dlouhy, A. Fomitchev, S. M. Lukyanov, C. Borcea, V. Borrel, H. Keller, O. Sorlin, Oleg B. Tarasov, P. Roussel-Chomaz, Yu. E. Penionzhkevich, A.J. Kordyasz, A.C. Mueller, J.M. Corre, I. Pecina, M. G. Saint-Laurent, R. Anne, N. K. Skobelev, and D. Guillemaud-Mueller
Subjects: Physics, Nuclear and High Energy Physics, Quasielastic scattering, Proton, 010308 nuclear & particles physics, Nuclear Theory, Radius, 01 natural sciences, 7. Clean energy, Nuclear physics, Cross section (physics), 0103 physical sciences, Halo, Nuclear Experiment, 010306 general physics, Nucleon, Energy (signal processing), Beam (structure)
Abstract: The quasielastic scattering of the exotic nucleus $^{8}\mathrm{B}$ on a $^{12}\mathrm{C}$ target has been studied at an energy of 320 MeV and compared with that of $^{7}\mathrm{Be}$ at the same velocity. The quasielastic scattering of $^{12}\mathrm{C}$ + $^{12}\mathrm{C}$ at 20 MeV/nucleon, also performed as a secondary beam experiment, was used to check the data reduction method. The results are interpreted in terms of a semimicroscopic double folding model and coupled-channels calculation. The difference in the total reaction cross section (8%) between $^{8}\mathrm{B}$ and $^{7}\mathrm{Be}$ is consistent with the measured one proton removal cross section and corresponds to an increase in the interaction radius of 4%. The existence of a substantial proton halo in $^{8}\mathrm{B}$ is not supported by the present data.
Published: 1995
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14. 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
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15. Beta-decay of 20Mg

Author: A.C. Mueller, D. Guillemaud-Mueller, M. Lewitowicz, J.M. Corre, A. Piechaczek, B. A. Brown, R. Anne, K. Rykaczewski, O. Sorlin, Shigeru Kubono, H. Keller, V. Kunze, M. Pfützner, M. F. Mohar, E. Roeckl, V. Borrel, W. D. Schmidt-Ott, R. Hue, P. Magnus, Terutaro Nakamura, and M. G. Saint-Laurent
Subjects: Physics, Quenching, Nuclear and High Energy Physics, Decay scheme, Proton, 010308 nuclear & particles physics, Nuclear Theory, chemistry.chemical_element, Germanium, 01 natural sciences, Beta decay, Ion, chemistry, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Excitation, Beam (structure)
Abstract: The β-decay of 20Mg was investigated. A secondary beam of 20Mg ions, produced in reactions between a 95 A·MeV24Mg-beam and a natNi-target, was isotopically separated by means of the LISE3 spectrometer at GANIL. This secondary beam was implanted into a silicon detector array surrounded by germanium γ-detectors. The β-delayed proton and γ-ray data, measured for this short-lived nucleus ( T 1 2 = 95 ± 3 ms ), were incorporated into an improved 20Mg→20Na decay scheme. The 2645 keV level in 20Na is of importance for the breakout from the astrophysical hot CNO-cycle and the onset of the rapid proton capture process via the reaction 19Ne(p,γ)20Na. An upper limit of 0.1% for the β-decay feeding of the 2645 keV level and a lower limit for the corresponding log ft value of 6.24 were determined. The implications of this result for the spin and parity assignment of the 2645 keV state are discussed. By comparing the 20Mg β-decay into the proton-unbound 3001 keV state in 20Na and the isospin-mirrored decay into the particle-bound 3488 keV level in 20F, an asymmetry ft + ft − − 1 = 1.69 −0.65 +0.86 was observed. The comparison of the experimentally determined B(GT) values for the Gamow-Teller β-decay of 20Mg with a calculation performed in a full sd-shell model space yields an overall quenching of the Gamow-Teller strength of 0.84, corresponding to an observed fraction of 71% of the calculated strength. The measured Gamow-Teller strength above excitation energies of 3 MeV is more fragmented than predicted by the shell-model calculation.
Published: 1995
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16. 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
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17. 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
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18. Production of a pure isomeric beam

Author: T. Ethvignot, B. Bonnereau, D. Bazin, R. Bimbot, O. Sorlin, M. Szmigiel, R. Anne, M. Lewitowicz, J. E. Sauvestre, M. St.Laurent, J.L. Uzureau, J.M. Corre, H. Keller, J. Trochon, A.C. Mueller, and P. Delbourgo-Salvador
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, Stable isotope ratio, Analytical chemistry, 01 natural sciences, 0103 physical sciences, Incident beam, Atomic physics, 010306 general physics, Beam (structure), Line (formation)
Abstract: A 42 Sc m isomeric beam was produced for the first time at GANIL. The 12 C( 40 Ca, 42 Sc m ) 10 B transfer reaction at 30 MeV / A yielded an isomeric purity of 98±5%. Using the LISE3 on line separation, 30% of the residual 40 Ca nuclei were observed. A 42 Sc m secondary beam intensity of 114 pps was obtained with a 3 10 10 pps 40 Ca incident beam bombarding the 5 mg/cm 2 12 C target.
Published: 1994
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19. 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
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20. 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
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21. RIB production by photofission in the framework of the ALTO project: first experimental measurements and Monte-Carlo simulations

Author: J. Lesrel, M. Raynaud, F. Ibrahim, A.C. Mueller, B. Roussière, J.F. LeDu, M. Ducourtieux, D. Guillemaud Mueller, D. Verney, S. Franchoo, A. Said, S. Essabaa, S. Wurth, C. Lau, M. Cheikh Mhamed, M. Lebois, 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: Physics, Nuclear and High Energy Physics, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Fission, Nuclear Theory, Monte Carlo method, Photofission, chemistry.chemical_element, Uranium, 01 natural sciences, 7. Clean energy, Nuclear physics, chemistry.chemical_compound, chemistry, Valley of stability, 0103 physical sciences, Cathode ray, Physics::Accelerator Physics, Uranium carbide, Nuclear Experiment, 010306 general physics, Instrumentation, Beam (structure)
Abstract: The ALTO facility (Accelerateur Lineaire aupres du Tandem d’Orsay) has been built and is now under commissioning. The facility is intended for the production of low energy neutron-rich ion-beams by ISOL technique. This will open new perspectives in the study of nuclei very far from the valley of stability. Neutron-rich nuclei are produced by photofission in a thick uranium carbide target (UC x ) using a 10 μA, 50 MeV electron beam. The target is the same as that already had been used on the previous deuteron based fission ISOL setup (PARRNE [ F. Clapier et al., Phys. Rev. ST-AB (1998) 013501. ]). The intended nominal fission rate is about 10 11 fissions/s. We have studied the adequacy of a thick carbide uranium target to produce neutron-rich nuclei by photofission by means of Monte-Carlo simulations. We present the production rates in the target and after extraction and mass separation steps. The results from Monte-Carlo simulations are compared to experimental data either with the ALTO facility (in the first step of commissioning, i.e. 100 nA of the electron beam current intensity), or with fast-neutron-induced fission generated from a 26 MeV deuteron beam. The results obtained support the suitability of FLUKA simulation code used to describe all the photofission process with an electron beam energy of 50 MeV.
Published: 2008
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22. 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
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23. 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
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24. The ALTO facility at IPN Orsay and study of neutron rich nuclei in the vincinity of $^{78}$Ni

Author: D. Guillemaud Mueller, J. Sauvage, C. Lau, A.C. Mueller, S. Essabaa, J. F. Le Du, M.C. Mhamed, F. Ibrahim, F. Le Blanc, M. Lebois, S. Franchoo, B. Roussière, S. Gales, D. Verney, 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), C.A. Bertulani, P.R.S. Gomes, M.S. Hussein and A. Szanto de Toledo, ALTO, 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, Fission, Photofission, Particle accelerator, Tandem accelerator, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, law.invention, Nuclear physics, chemistry.chemical_compound, chemistry, Deuterium, law, 0103 physical sciences, Uranium carbide, Neutron, 010306 general physics, Beam (structure)
Abstract: International audience; The ALTO facility at IPN Orsay is based on a linear electron accelerator (50 MeV, 10μA) dedicated to the production of neutron rich radiactive beams by photofission of a thick uranium carbide target paced on an ISOL line. The construction of the facility has ended in december 2005 and the first on-line tests have been carried out in mid-2006. The production of fission fragments after separation have been measured and are similar to the calculated predictions. Previously, using the same ISOL line, neutron rich nuclei in the vincinity of 78Ni have been produced and studied using the deuteron beam available at the Tandem accelerator in Orsay. First results on excited states in $^{83}_{32}Ge_{51}$ and $^{81}_{31}Ge_{50}$ have been obtained and discussed in the frame of the shell model.
Published: 2006
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25. 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
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26. Exploratory analysis of a neutron-rich nuclei source based on photo-fission

Author: S. Kandri-Rody, J. Proust, F. Ibrahim, L. Groza, O. Bajeat, M. Mirea, A.C. Mueller, S. Essabaa, F. Clapier, N. Pauwels, 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 Robert, Suzanne
Subjects: Physics, Nuclear and High Energy Physics, Range (particle radiation), Cold fission, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], 010308 nuclear & particles physics, Fission, Nuclear Theory, Bremsstrahlung, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Kinetic energy, 7. Clean energy, 01 natural sciences, Nuclear physics, Dipole, 0103 physical sciences, Radiative transfer, Neutron, 010306 general physics, Nuclear Experiment, Instrumentation
Abstract: A source of neutron rich ions can be conceived through the photo-fission process. An exploratory study of such a source is realized. A survey of the radiative electron energy loss theory is reported in order to estimate numerically the bremsstrahlung production of thick targets. The resulted bremsstrahlung angular and energy theoretical distributions delivered from W and UCx thick converters are presented and compared with previous results. Some quantities as the number of fission events produced in the fissionable source and the energy loss in the converters are also reported as function of the geometry of the combination and the incident electron energy. An attempt of comparison with experimental data shows a quantitative agreement. This study is focussed on initial kinetic energies of the electron beam included in the range 30–60 MeV, suitable for the production of large radiative γ-ray yields able to induce the 238 U fission through the giant dipole resonance. A confrontation with the number of fission events produced in the frame of the fast neutron induced fission method indicates that the photo-fission can be a competitive concept.
Published: 2003

27. 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
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28. Detection of neutron clusters

Author: M. Freer, F. de Oliveira Santos, Thomas Nilsson, Graziele De Sousa Costa, S. P. G. Chappell, B. R. Fulton, N. A. Orr, J. C. Angélique, Fred Sarazin, O. Dorvaux, Karin Markenroth, Leif Axelsson, K. Riisager, S. Grévy, G. Giardina, N. M. Clarke, M. J. G. Borge, Giovanni Fazio, D. Guillemaud-Mueller, B. Heusch, Gunnar Nyman, B. Benoit, Alain Ninane, F. M. Marqués, M. G. Saint Laurent, U. C. Bergmann, E. de Goes Brennand, F. Hanappe, A.C. Mueller, I. Piqueras, M. J. Lopez, S. Leenhardt, L. Stuttge, M. Labiche, N. Curtis, M. Lewitowicz, W. N. Catford, O. Sorlin, C. Le Brun, Björn Jonson, A. D'Arrigo, S. M. Singer, 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), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Nuclear Theory, Scintillator, Few-body systems, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Breakup, 01 natural sciences, 3. Good health, Nuclear physics, 0103 physical sciences, Tetraneutron, Cluster (physics), Neutron, [PACS]Few-body systems, [PACS]Nucleon distributions and halo features, Nuclear Experiment, 010306 general physics, Nucleon, [PACS]Nuclear reactions involving few-nucleon systems
Abstract: 10 pages, 2 tables, 13 figures.--PACS nrs.: 21.45.1v, 25.10.1s, 21.10.Gv.--ArXiv pre-print available at: http://arxiv.org/abs/nucl-ex/0111001, A new approach to the production and detection of bound neutron clusters is presented. The technique is based on the breakup of beams of very neutron-rich nuclei and the subsequent detection of the recoiling proton in a liquid scintillator. The method has been tested in the breakup of intermediate energy (30-50 MeV/nucleon) Li-11, Be-14, and B-15 beams. Some six events were observed that exhibit the characteristics of a multineutron cluster liberated in the breakup of Be-14, most probably in the channel Be-10+(4)n. The various backgrounds that may mimic such a signal are discussed in detail., This work was funded under the auspices of the IN2P3-CNRS (France) and EPSRC (United Kingdom). Additional support from the ALLIANCE program (Ministère des Affaires Etrangères and British Council) and the Human Capital and Mobility Program of the European Community (Contract No. CHGE-CT94-0056) is also acknowledged.
Published: 2002
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29. 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
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30. 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

31. Changes in neutron shell closures of light very neutron-rich nuclei

Author: F. Sarazin, G. Thiamová, R. Anne, Oleg B. Tarasov, F. Azaiez, Robert Page, D. Ridikas, A.T. Reed, J. C. Angéligue, F. Pougheon, A. Gillibert, A.C. Mueller, J. Mrazek, Yu. Ts. Oganessian, M. Lewitowicz, Hiroyoshi Sakurai, Zhongzhou Ren, F. Nowacki, M. G. Saint-Laurent, F. de Oliveira, P. Roussel-Chomaz, E. Caurier, N. A. Orr, C. Borcea, W. Mittig, J. S. Winfield, Z. Dlouhý, A. S. Lalleman, G. Auger, S. Grévy, S. M. Lukyanov, D. Guillemaud-Mueller, A. de Vismes, O. Sorlin, Yu. E. Penionzhkevich, D. Baiborodin, H. Savajols, M. J. Lopez-Jimenez, 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 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), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Isotope, Silicon, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Binding energy, Nuclear Theory, General Physics and Astronomy, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Instability, Nuclear physics, chemistry, 0103 physical sciences, Neutron, Nuclear drip line, Atomic physics, 010306 general physics, Spectroscopy, Nuclear Experiment
Abstract: We present a review of experimental studies on the properties of extremely neutron-rich nuclei (Z = 6-20, A = 20-60) near the neutron drip line. Recent data on mass measurements of neutron-rich nuclei at, GANIL, (Caen, France) and some characteristics of binding energies in this region are discussed. Being sensitive to the existence of nuclear shells separation energies S-2n together with the evidence of particle instability of doubly magic nuclei He-10 and O-28 could provide information on changes in shell closures. Particularly opening of an N = 16 shell and vanishing of the N = 20 shell for very neutron-rich isotopes is under discussion. Decay studies of these hardly accessible short-lived neutron-rich nuclei from oxygen to silicon using the in-beam gamma -ray spectroscopy are also reported.
Published: 2001

32. Deriving the angular variation of p||-distributions for halo neutrons with robust statistics

Author: Thomas Nilsson, N. A. Orr, Leif Axelsson, A.C. Mueller, R. Anne, K. Riisager, Göran Hugo Nyman, D. Guillemaud-Mueller, M. H. Smedberg, O. Sorlin, Björn Jonson, M. G. Saint-Laurent, F. Pougheon, S. Grévy, M. Lewitowicz, J. C. Angelique, P. Hornshøj, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut 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), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Physics, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, Nuclear Theory, Robust statistics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Breakup, 01 natural sciences, Core (optical fiber), Momentum, Nuclear physics, Distribution (mathematics), 0103 physical sciences, Neutron, Halo, Nuclear Experiment, 010306 general physics
Abstract: The longitudinal neutron momentum distribution from core breakup of Li-11 and Be-11 have been measured at 29.9 MeV/u and 38.5 MeV/u, respectively. Separate measurements on Li-9 and Be-10 allowed extraction of the halo neutron distribution. The shapes of the distributions are analyzed using robust and descriptive statistics, For both isotopes the shape is changing with angle. (C) 2001 Elsevier Science B.V. All rights reserved.
Published: 2001
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33. Radioactive Beams in France

Author: A.C. Mueller, 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 physics, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, 01 natural sciences, 7. Clean energy, Radioactive beam
Abstract: Radioactive Beams are produced by two different ways, In-Flight and ISOL, which, suited for quite different types of experiments, complement each other. We shall discuss the development of the In-Flight beams at the French national accelerator GANIL over the years. Consecutively, we present the new ISOL type facility SPIRAL which is now commissioned at GANIL. Subsequently, the R&D programme PARRNe of IPN Orsay for intense fission fragment beams as well as the plans to implement the acceleration of such beams at the “SPIRAL-II” facility will be outlined. We then discuss the R&D (collaboration Saclay - Orsay - Grenoble) for multi-megawatt class accelerators relevant to the plans for second generation radioactive beam facilities like the European EURISOL. Such accelerators being of great promise for other fields, a certain synergy to radioactive beams should exist. The present article gives an overview of all these activities and will stress some selected aspects.
Published: 2000

34. Characteristics of neutron-rich nuclei around shell closures N=20 and 28

Author: F. Nowacki, H. Savajols, J. C. Angéligue, P. Roussel-Chomaz, D. Ridikas, A. de Vismes, A.C. Mueller, M. G. Saint-Laurent, D. Guillemaud-Mueller, Robert Page, Hiroyoshi Sakurai, M. Lewitowicz, F. Pougheon, J. Mrazek, A. S. Lalleman, F. Sarazin, E. Caurier, Z. Z. Ren, A.T. Reed, C. Borcea, F. de Oliveira, G. Auger, S. Grévy, J. S. Winfield, Z. Dlouhý, Yu. E. Penionzhkevich, W. Mittig, S. M. Lukyanov, R. Anne, O. Sorlin, A. Gillibert, D. Baiborodin, Oleg B. Tarasov, N. A. Orr, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), 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), Heyd, Yvette, Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, [PHYS.NUCL] Physics [physics]/Nuclear Theory [nucl-th], Nuclear and High Energy Physics, Isotope, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Nuclear Theory, Binding energy, Nuclear structure, Shell (structure), 01 natural sciences, Spectral line, Nuclear physics, 0103 physical sciences, Mass spectrum, Neutron, Nuclear drip line, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract: The paper presents a review of experimental results obtained at GANIL and FLNR Dubna on the study of the particle stability of neutron-rich nuclei near the neutron drip line. Very recent data on mass measurements of neutron-rich nuclei in the range A =29–47 at GANIL and some characteristics of binding energies in this region are presented. Nuclear binding energies are very sensitive to the existence of shells and provide clear signatures of shell closures. Experiments have been mostly performed in cooperation GANIL–Orsay–Dubna–Řež–Bucharest–Liverpool.
Published: 2000

35. Two-neutron interferometry as a probe of the nuclear halo

Author: Björn Jonson, Giorgio Giardina, F. Sarazin, M. Lewitowicz, Francis Hanappe, N. M. Clarke, U. C. Bergmann, S. Leenhardt, A.C. Mueller, A. D’Arrigo, B. Heusch, M. J. Lopez, S. Grévy, F. de Oliveira Santos, S. P. G. Chappell, N. A. Orr, J. C. Angélique, O. Dorvaux, S M Singer, Karin Markenroth, Leif Axelsson, M. Freer, K. Riisager, B. Benoit, A. Ninane, I. Piqueras, B.R. Fulton, W. N. Catford, G. Costa, M. G. Saint-Laurent, M. Labiche, Louise Stuttge, M. Motta, C. Gregori, N. Curtis, C. Le Brun, D. Guillemaud-Mueller, F. M. Marqués, María José García Borge, E. de Goes Brennand, O. Sorlin, Thomas Nilsson, Göran Hugo Nyman, 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), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Physics, Nuclear and High Energy Physics, Spatial configuration, 010308 nuclear & particles physics, Iterative method, Halo nucleus, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Dissociation (chemistry), Computational physics, Interferometry, 0103 physical sciences, Neutron, Halo, Atomic physics, 010306 general physics
Abstract: The technique of intensity interferometry is proposed as a probe of the spatial configuration of two-Neutron haloes. After exploring the sensitivity of interferometry to the n-N configuration, it is demonstrated that the application of the standard method for constructing the correlation function is not valid for halo neutrons. A new iterative method is presented and applied to measurements of the dissociation of 6He, 11Li and 14Be. The correlation functions for these systems have thus been extracted for the first time and the corresponding root-Mean-Square n-n separations estimated. The results are in agreement with the predictions of available three-Body models. (C) 2000 Published by Elsevier Science B.V.
Published: 2000
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36. Production of neutron-rich isotopes in fission of uranium induced by neutrons of 20 MeV average energy

Author: P. Jardin, Jussi Huikari, Ari Jokinen, Juha Äystö, A. Nieminen, C. Lau, Jean Vervier, M. G. Saint-Laurent, J. C. Wang, V. A. Rubchenya, Peter Dendooven, Heikki Penttilä, Kari Perajarvi, L. Lebreton, D. Vakhtin, V. Kolhinen, Wladyslaw Henryk Trzaska, A.C. Mueller, Antonio Villari, G. Lhersonneau, S. Nummela, Z. Radivojevic, G. Canchel, 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), 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), 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), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, Cold fission, Isotopes of uranium, 010308 nuclear & particles physics, Neutron emission, Isotopes of samarium, Nuclear Theory, Fission product yield, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Fast fission, Nuclear physics, Uranium-238, 0103 physical sciences, Physics::Accelerator Physics, Nuclear Experiment, 010306 general physics, Long-lived fission product
Abstract: In the context of a parameter study conducted by several laboratories for future European radioactive beam facilities based on fast-neutron induced fission, in particular for the SPIRAL-II project at GANIL, we have measured the yields of neutron-rich isotopes in the mass range of 88 to 144. These nuclei were obtained as fission products of natural uranium bombarded by neutrons of 20 MeV average energy emitted by a thick carbon target irradiated by 50 MeV deuterons. Yields have been measured using on-line mass separation with the ion-guide method. Compared with proton-induced fission at 25 MeV the magnitude of cross-sections, except for the symmetric region, is similar. Z-distributions of isobars have the same width, 0.7 charge units, but their maxima are shifted by about 0.8 charge units, favouring production of the neutron-richer isobars. Our data allow calculations of absolute cross-sections for fission of natural uranium induced by neutrons of about 20 MeV.
Published: 2000
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37. In-beam gamma spectroscopy of very neutron-rich nuclei at GANIL

Author: C. Borcea, S. Leenhardt, I. Deloncle, M. G. Saint-Laurent, Z. Dlouhy, Yu-E. Penionzhkevich, M. Lewitowicz, O. Sorlin, M. Belleguic, M. J. Lopez, A. Gillibert, C. Donzaud, Ch. Bourgeois, F. Pougheon, H. Savajols, J. M. Daugas, F. Azaiez, M. Stanoiu, M. G. Porquet, F. de Oliveira, J. C. Angélique, S. Grévy, J. Kiener, Josette Duprat, D. Guillemaud-Mueller, A.C. Mueller, N. L. Achouri, J. E. Sauvestre, Yu. Sobolev, W. Shuying, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Smit F.D. Lindsay R. Foertsch S.V., 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), and Robert, Suzanne
Subjects: Physics, Isotope, 010308 nuclear & particles physics, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Theory, Gamma ray, Coulomb excitation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Condensed Matter Physics, 01 natural sciences, Atomic and Molecular Physics, and Optics, Nuclear physics, Excited state, 0103 physical sciences, Neutron, Gamma spectroscopy, Atomic physics, Nuclear Experiment, 010306 general physics, Ground state, Mathematical Physics, Beam (structure)
Abstract: The structure of nuclei far from stability can be investigated by means of in-beam gamma spectroscopy using both stable and radioactive beams. Two such experiments have been recently performed at GANIL. i) Secondary beams of neutron-rich Ge, Zn and Ni isotopes around N=40 were produced from the fragmentation of a primary 86 Kr beam, and analyzed by means of the LISE3 spectrometer. For the transitions between the 0+ ground state and the first 2+ state, B(E2) values have been extracted from Coulomb excitation cross-section measurement. Some of the obtained results related to the effectiveness of the N=40 spherical sub-shell closure are discussed. ii) In-beam γ-spectroscopy of neutron-rich nuclei around 32Mg produced by fragmentation of 36S have been performed recently. Gamma decay of relatively higher excited states have been measured in a large number of exotic light nuclei. Preliminary results obtained in a number of neutron-rich nuclei around N=20 are presented.
Published: 1999

38. Radioactivity of neutron-rich oxygen fluorine and neon isotopes

Author: Burjan, Jouni Suhonen, N. A. Orr, A.T. Reed, S. M. Vincent, R. Anne, W. N. Catford, F. M. Marqués, M. G. Saint-Laurent, C. Borcea, J. C. Angélique, P. H. Regan, O. Sorlin, S. M. Lukyanov, J. Novák, Teemu Siiskonen, Robert Page, S. Grévy, D. Guillemaud-Mueller, F. Pougheon, R. G. Allatt, Yu. E. Penionzhkevich, E. Sokol, C. Donzaud, Z. Dlouhy, W. Trinder, A.C. Mueller, M. Lewitowicz, Oleg B. Tarasov, G. Martínez, P. J. Nolan, 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), 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, Isotopes of germanium, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Gamma ray, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, Internal conversion, Isotopes of neon, 13. Climate action, 0103 physical sciences, Beta particle, Isotopes of zirconium, Nuclear Experiment, 010306 general physics, Radioactive decay, Energy (signal processing)
Abstract: The $\ensuremath{\gamma}$ radiation and neutrons emitted following the $\ensuremath{\beta}$ decays of ${}^{24}\mathrm{O},$ ${}^{25--27}\mathrm{F},$ and ${}^{28\ensuremath{-}30}\mathrm{Ne}$ have been measured. The nuclides were produced in the quasifragmentation of a 2.8 GeV ${}^{36}\mathrm{S}$ beam, separated in-flight and identified through time-of-flight and energy-loss measurements. The ions were stopped in a silicon detector telescope, which was used to detect the $\ensuremath{\beta}$ particles emitted in their subsequent radioactive decay. The coincident $\ensuremath{\gamma}$ rays were measured using four large volume germanium detectors mounted close to the implantation point and the neutrons were detected using 42 ${}^{3}\mathrm{He}$ proportional counters. The measured $\ensuremath{\gamma}$-ray energy spectra are compared with shell model calculations and, where available, the level energies deduced from multinucleon transfer reactions.
Published: 1999

39. Core-breakup reactions of the halo muclei $^{11}Be$ and $^{11}Li$ : momentum distributions and shadow effects

Author: P. G. Hansen, N. A. Orr, M. H. Smedberg, R. Anne, P. Hornshøj, F. Pougheon, D. Guillemaud-Mueller, Thomas Nilsson, Leif Axelsson, K. Riisager, M. G. Saint-Laurent, Björn Jonson, A.C. Mueller, O. Sorlin, Göran Hugo Nyman, J. C. Angelique, M. Lewitowicz, S. Grévy, 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), 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, SIMPLE (dark matter experiment), 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Halo nucleus, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Breakup, 01 natural sciences, 7. Clean energy, Coincidence, Core (optical fiber), Momentum, Nuclear physics, 0103 physical sciences, Neutron, Halo, Atomic physics, Nuclear Experiment, 010306 general physics, Nuclear Physics
Abstract: The halo nuclei Be-11 and Li-11 have been studied in core-breakup reactions where the halo neutrons are expected to be released without a major distortion due to the reaction. The widths of the halo-neutron momentum distributions have been extracted in coincidence with He fragments, Gamma = 32 +/- 4 MeV/c, and Li fragments, Gamma = 42 +/- 4 MeV/c for Be-11 and with He fragments, Gamma =42+/-6 MeV/c for Li-11. The Be-11 breakup gives a very low neutron multiplicity of 0.38+/-0.09 which is a manifestation of the shadowing of the neutron in the core-breakup reaction. This value can be understood from a simple theoretical calculation, which also accounts for the observed transverse momentum widths at small angles. (C) 1999 Elsevier Science B.V.
Published: 1999
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40. Dripline nuclei produced by quasi-fragmentation of the $^{32,34,36}$S primary beams

Author: W. Trinder, R. D. Page, N. K. Skobelev, O. Sorlin, V. D. Toneev, A.C. Mueller, D. Baiborodin, A. S. Fomichev, Yu. Ts. Oganessian, S. M. Lukyanov, M. G. Saint-Laurent, Oleg B. Tarasov, C. Borcea, Z. Dlouhý, E. A. Sokol, M. Lewitowicz, Yu. E. Penionzhkevich, A.T. Reed, R. Kalpakchieva, D. Guillemaud-Mueller, R. Anne, 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: inorganic chemicals, Nuclear reaction, Physics, Nuclear and High Energy Physics, Light nucleus, Isotope, 010308 nuclear & particles physics, technology, industry, and agriculture, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Instability, Isotopes of oxygen, Nuclear physics, Fragmentation (mass spectrometry), Isotopes of neon, biological sciences, 0103 physical sciences, Physics::Accelerator Physics, lipids (amino acids, peptides, and proteins), Atomic physics, Nuclear Experiment, 010306 general physics, Beam (structure)
Abstract: Some regularities in the production of isotopes with are investigated in reactions induced by beams at on targets , and . A search for using a beam of the neutron-rich has been performed. Evidence for particle instability of was obtained. In the same experiment, the half lives of the very neutron-rich isotopes and were measured for the first time.
Published: 1999
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41. Subshell closure study at N=40 by Coulomb excitation and $\beta$-decay

Author: C. Donzaud, G. Canchel, Yu-E. Penionzhkevich, J. M. Daugas, F. Pougheon, C. Borcea, A. Gillibert, J. S. Winfield, M. G. Saint-Laurent, A. Emsalem, M. Belleguic, S. Leenhardt, R. Béraud, C. Longour, J. C. Angélique, D. Guillemaud-Mueller, F. Azaiez, A.C. Mueller, J. Kiener, Josette Duprat, Eric Chabanat, M. G. Porquet, I. Deloncle, J. E. Sauvestre, F. Marie, Yu. Sobolev, S. Grévy, C. Bourgeois, M. Lewitowicz, O. Sorlin, F. de Oliveira, N. A. Orr, 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), 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 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), 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), 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), Normandie Université (NU)-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 Frois B.
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, 0103 physical sciences, Closure (topology), Coulomb excitation, Atomic physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences, ComputingMilieux_MISCELLANEOUS
Abstract: NESTER; International audience
Published: 1998
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42. In-beam gamma spectroscopy of very neutron-rich nuclei at GANIL

Author: F. Pougheon, A. Gillibert, J. C. Angélique, F. Azaiez, S. Leenhardt, M. J. Lopez, Z. Dlouhy, M. Stanoiu, M. Belleguic, M. G. Porquet, W. Shuying, M. G. Saint-Laurent, N. L. Achouri, M. Lewitowicz, S. Grévy, C. Donzaud, J. Kiener, H. Savajols, N. A. Orr, Yu-E. Penionzhkevich, O. Sorlin, J. M. Daugas, C. Borcea, F. Marie, Yu. G. Sobolev, Josette Duprat, P. Roussel-Chomaz, I. Deloncle, D. Guillemaud-Mueller, A.C. Mueller, J. E. Sauvestre, W. Mittig, F. de Oliveira, Ch. 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), 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), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Baktash C., 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, Isotope, 010308 nuclear & particles physics, Gamma ray, Coulomb excitation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, Excited state, 0103 physical sciences, Neutron, Gamma spectroscopy, 010306 general physics, Ground state, Nuclear Experiment, Beam (structure)
Abstract: International audience; The structure of nuclei far from stability call be investigated by means of in-beam gamma spectroscopy using both stable and radioactive beams. A gamma -array consisting of BaF2 and Ge detectors have been used at GANIL in order to perform two of such experiments: i) Secondary beams of neutron-rich Ge, Zn and Ni isotopes around N=40 were produced from the fragmentation of a primary /sup 86/Kr beam, and analyzed by means of the LISE3 spectrometer. For the transitions between the 0/sup +/ ground state and the first 2/sup +/ state, B(E2) values have been extracted from Coulomb excitation cross-section measurement. Some of the obtained results related to the effectiveness of the N=40 spherical sub-shell closure as well as future improvements of the quality of the data are discussed. ii) In-beam gamma -spectroscopy of neutron-rich nuclei around /sup 32/Mg produced by fragmentation of /sup 36/S have been recently performed Gamma decay of relatively higher excited states have been measured in a large number of exotic light nuclei. Preliminary results obtained in a number of even-even nuclei around N=20, such as /sup 20,22/O, /sup 26,28/Ne and /sup 30,32/Mg are presented.
Published: 1998
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43. Production of nuclei in $^{32,34,36}$S-induced reactions in the energy range 6-75 MeV/A

Author: M. Lewitowicz, S. M. Lukyanov, V. Z. Maidikov, Z. Dlouhy, W. Trinder, R. Anne, Yu. Ts. Oganessian, O. Sorlin, V.D. Toneev, A.C. Mueller, Yu. E. Penionzhkevich, M. G. Saint-Laurent, C. Borcea, N. K. Skobelev, Oleg B. Tarasov, A. S. Fomichev, D. Guillemaud-Mueller, R. Kalpakchieva, D. Baiborodin, 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), Oganessian Y-T. Kalpakchieva R., 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 Robert, Suzanne
Subjects: Nuclear reaction, Physics, Nuclear and High Energy Physics, Range (particle radiation), Isotope, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], 010308 nuclear & particles physics, Projectile, Inelastic collision, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, 0103 physical sciences, Atomic physics, 010306 general physics, Nuclear Experiment, ComputingMilieux_MISCELLANEOUS, Energy (signal processing)
Abstract: International audience; Some regularities in the production of isotopes with 6 ≤ Z ≤ 14 are investigated in reactions induced by 32,34,36S beams at 6 < E < 75 MeV/A on targets of natC, 181Ta and 197Au. The isotope yields and the most probable fragment mass A (for a given Z) are studied as a function of target, projectile mass and energy. A comparison is made of the experimental data at low energies with calculations in the framework of the dynamical model of deep inelastic collisions. The obtained data are considered from the point of view of the feasibility of heavy ion beams for producing nuclei far from the line of stability.
Published: 1997
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44. Search for $^{28}O$ and study of neutron-rich nuclei near the N=20 shell closure

Author: W. Trinder, W. Schwab, O. Sorlin, Frédéric Nowacki, Robert Page, M. Lewitowicz, Oleg B. Tarasov, R. Anne, A.C. Mueller, S. Grévy, J. C. Angélique, C. Borcea, C. Donzaud, J. S. Winfield, M. G. Saint-Laurent, F. Pougheon, S. M. Lukyanov, N. A. Orr, Yu. Ts. Oganessian, Yu. E. Penionzhkevich, R. G. Allatt, E. Sokol, Z. Dlouhy, A.T. Reed, D. Guillemaud-Mueller, Alexander Ostrowski, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut 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), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, Closure (topology), Shell (structure), Deformation (meteorology), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Beam (structure)
Abstract: A search for **O with a 78 AMeV beam of the neutron-rich isotope 36S has been performed for the first time. Evidence for the unbound character of “0 was obtained. In the same experiment the half-lives of the very neutron-rich isotopes 27,29F and 30Ne were measured and those for 28*29Ne and 30*31 Na reexamined. The results are compared to shell-model predictions and conclusions drawn regarding the extent of the region of deformation around N = 20. @ 1997 Published by Elsevier Science B.V.
Published: 1997
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45. Invariant-mass spectroscopy of $^{10}$Li and $^{11}$Li

Author: A.C. Mueller, H. Irnich, R. Kulessa, K. Riisager, A. Magel, P. G. Hansen, Thomas Nilsson, K. Stelzer, J. V. Kratz, C. Scheidenberger, Göran Hugo Nyman, Y. Leifels, Björn Jonson, Achim Richter, G. Schrieder, E. Zude, Herbert A. Simon, E. Wajda, L. V. Chulkov, D. Guillemaud-Mueller, Th. W. Elze, H. Emling, H. Lenske, Markus Zinser, M. J. G. Borge, F. Humbert, Thomas Aumann, G. Münzenberg, Hans Geissel, Olof Tengblad, J. Cub, A. Surowiec, Joachim Stroth, F. Nickel, W. Schwab, R. Holzmann, 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 Robert, Suzanne
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, 010308 nuclear & particles physics, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Ion, 0103 physical sciences, Invariant mass, Neutron, Atomic physics, Multiplicity (chemistry), Nuclear Experiment, 010306 general physics, Nucleon, Spectroscopy, Excitation, Nuclear Physics
Abstract: Break-up of secondary Li-11 ion beams (280 MeV/nucleon) on C and Pb targets into Li-9 and neutrons is studied experimentally. Cross sections and neutron multiplicity distributions are obtained, characterizing different reaction mechanisms. Invariant-mass spectroscopy for Li-11 and Li-10 is performed. The E1 strength distribution, deduced from electromagnetic excitation of Li-11 up to an excitation energy of 4 MeV comprises similar to 8% of the Thomas-Reiche-Kuhn energy-weighted sumrule strength. Two low-lying resonance-like structures are observed for Li-10 at decay energies of 0.21(5) and 0.62(10) MeV, the former one carrying 26(10)% of the strength and likely to be associated with an s-wave neutron decay. A strong di-neutron correlation in Li-11 can be discarded. Calculations in a quasi-particle RPA approach are compared with the experimental results for Li-10 and Li-11. (C) 1997 Elsevier Science B.V.
Published: 1997

46. $^{40}$Ti $\beta$ decay and the neutrino capture cross section of $^{40}$Ar

Author: S. Leenhardt, M. Lewitowicz, W. Trinder, H. E. Swanson, A.C. Mueller, R. Anne, M. Bhattacharya, A. Garcia, M. G. Saint-Laurent, D. Guillemaud-Mueller, Eric Adelberger, O. Sorlin, C. Donzaud, N. I. Kaloskamis, F. Pougheon, 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), 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, ICARUS, Nuclear and High Energy Physics, Decay scheme, Proton, 010308 nuclear & particles physics, Solar neutrino, Absorption cross section, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, Cross section (physics), Excited state, 0103 physical sciences, Atomic physics, Neutrino, 010306 general physics, Nuclear Physics
Abstract: 40 Ti β decay was studied at GANIL using the LISE3 spectrometer. A decay scheme was deduced from twenty-one observed β-delayed proton transitions feeding the ground and first excited states of 39 Ca. The 40 Ti half-life was found to be 51.7(6) ms. These results imply that the ICARUS 40 Ar detector has an effective absorption cross section for 8 B solar neutrinos of 14.5(4) × 10 −43 cm 2 ; 73% of the total cross section arises from Gamow-Teller transitions that were neglected in early estimates of the ICARUS efficiency.
Published: 1997
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47. Cyclotron isochronism tuning by phase measurements with a fast scintillator at very low beam intensity

Author: A.C. Mueller, L. Boy, M.H. Moscatello, D. Bibet, B. Launé, 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), 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, business.industry, Cyclotron, Detector, Phase (waves), Scintillator, 01 natural sciences, Particle detector, 010305 fluids & plasmas, law.invention, Nuclear magnetic resonance, Optics, law, Physics::Plasma Physics, 0103 physical sciences, Scintillation counter, Measuring instrument, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, business, Instrumentation, Beam (structure)
Abstract: International audience; The goal of this full-scale experiment was to tune the cyclotron at very low-intensity (102 – 103 pps). A special low-intensity probe for phase measurements was built and tested in the GANIL SSC2 cyclotron. It is based on a fast plastic scintillator and mounted on a radial probe. Using this detector the phase extension and the central phase of the beam were measured and the cyclotron isochronism was accurately tuned.
Published: 1997
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48. $^8$B studied as a secondary beam at Ganil

Author: N. K. Skobelev, C. Borcea, A.J. Kordyasz, D. Guillemaud-Mueller, A. Fomitchev, V. Borrel, S. M. Lukyanov, J.M. Corre, P. Roussel-Chomaz, F. Carstoiu, R. Anne, Oleg B. Tarasov, Z. Dlouhy, Yu. E. Penionzhkevich, H. Keller, M. Lewitowicz, F. Negoita, D. Bazin, M. G. Saint-Laurent, A.C. Mueller, O. Sorlin, Blanchet, Marie-Christine, 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), Horia Hulubei National Institute of Physics and Nuclear Engineering (NIPNE), IFIN-HH, 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), Flerov Laboratory of Nuclear Reactions [Dubna] (FLNR), Joint Institute for Nuclear Research (JINR), 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: Diffraction, Physics, Nuclear and High Energy Physics, Silicon, Spectrometer, 010308 nuclear & particles physics, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Dissociation (chemistry), law.invention, Nuclear physics, Telescope, chemistry, law, 0103 physical sciences, Coulomb, Halo, Atomic physics, Nuclear Experiment, 010306 general physics, ComputingMilieux_MISCELLANEOUS
Abstract: The LISE spectrometer at GANIL has been used to form a 8 B secondary beam. Using a multiple silicon telescope, data have been obtained for the reaction and break-up cross sections, as well as for the parallel momentum distribution of 7 Be from break-up. For the first time, separate contributions to the break-up of diffraction and/or Coulomb dissociation and absorption mechanisms have been determined. The ensemble of data supports the existence in 8 B of a “pigmy” halo.
Published: 1997
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49. $^{6}$He and neutron momentum distributions from $^{8}$He in nuclear break-up reactions at 240 MeV/u

Author: C. Scheidenberger, M. F. Mohar, Olof Tengblad, Björn Jonson, E. Zude, Mikhail V. Zhukov, Th. W. Elze, F. Humbert, W. Schwab, Hans Geissel, J. G. Keller, Achim Richter, P. G. Hansen, Thomas Nilsson, M. H. Smedberg, R. Holzmann, Markus Zinser, Th. Blaich, A. Magel, H. Klingler, J. V. Kratz, A. A. Korsheninnikov, W. Trautmann, B. M. Sherrill, D. Lambrecht, K. Riisager, F. Nickel, Joachim Stroth, H. Emling, K. Stelzer, M. J. G. Borge, D. Guillemaud-Mueller, G. Schrieder, R. Kulessa, Herbert A. Simon, H. Irnich, K. Grimm, G. Münzenberg, A.C. Mueller, E. Wajda, L. V. Chulkov, Y. Leifels, Göran Hugo Nyman, 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: Physics, Nuclear reaction, Nuclear and High Energy Physics, SIMPLE (dark matter experiment), Momentum (technical analysis), Break-Up, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Sigma, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, Cross section (physics), 0103 physical sciences, Neutron cross section, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Nuclear Physics
Abstract: Neutron and He-6 momentum distributions from He-8 break-up reactions in a C target have been measured at 240 MeV/u. The two-neutron removal cross section was found to be sigma(-2n) = 0.27 +/- 0.03 b. The nature of the momentum distributions is interpreted in some simple reaction scenarios.
Published: 1996

50. Neutrons from the breakup of $^{19}$C

Author: P. G. Hansen, E. Liegard, M. H. Smedberg, G. Bizard, D. Guillemaud-Mueller, W. N. Catford, F. M. Marqués, B. Heusch, Y. Schutz, M. G. Saint-Laurent, G. Martınez, N. A. Orr, A.C. Mueller, D. D. Warner, F. Hanappe, Björn Jonson, M. Lewitowicz, Thomas Nilsson, Alain Ninane, J. C. Angélique, Leif Axelsson, C. Le Brun, Martin Freer, O. Sorlin, K. Riisager, Göran Hugo Nyman, G. J. Gyapong, L. Stuttge, F. Pougheon, B. Petersen, F. Lefebvres, N. M. Clarke, François-René Lecolley, S. Grévy, G.J. Costa, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), 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 SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-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, Nuclear Theory, Tantalum, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Breakup, 01 natural sciences, Momentum, Nuclear physics, chemistry, Reaction model, 0103 physical sciences, Neutron, Halo, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Beam (structure)
Abstract: Neutrons arising from the breakup of a 30 MeV/nucleon C-19 beam on a tantalum target have been measured using the 98 element array DEMON. A narrow, forward peaked neutron angular distribution, with a corresponding momentum spread considerably smaller than those measured simultaneously for N-21, O-22 and F-24 was observed for charged fragments with Z < Z(proj). Interpreted in terms of the core-breakup reaction model, the results support the existence of a one neutron halo in C-19.
Published: 1996
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