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101. Spectroscopy ofF26to Probe Proton-Neutron Forces Close to the Drip Line

Author: Gustav R. Jansen, F. Rotaru, G. F. Grinyer, M. Hjorth-Jensen, O. Llidoo, O. Sorlin, L. Gaudefroy, L. Caceres, B. A. Brown, R. Borcea, Dóra Sohler, Gaute Hagen, F. Negoita, F. de Oliveira, B. Bastin, M. G. Saint-Laurent, Marie-Geneviève Porquet, M. Stanoiu, J. C. Thomas, C. Borcea, A. Lepailleur, and S. Grévy
Subjects: Physics, 010308 nuclear & particles physics, Neutron emission, Binding energy, General Physics and Astronomy, 01 natural sciences, Coupled cluster, Excited state, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Spectroscopy, Ground state, Multiplet
Abstract: A long-lived J(π) = 4(1)(+) isomer, T(1/2) = 2.2(1) ms, has been discovered at 643.4(1) keV in the weakly bound (9)(26)F nucleus. It was populated at Grand Accelerateur National d'Ions Lourds in the fragmentation of a (36)S beam. It decays by an internal transition to the J(π) = 1(1)(+) ground state [82(14)%], by β decay to (26)Ne, or β-delayed neutron emission to (25)Ne. From the β-decay studies of the J(π) =1(1)(+) and J(π) = 4(1)(+) states, new excited states have been discovered in (25,26)Ne. Gathering the measured binding energies of the J(π) = 1(1)(+) -4(1)(+) multiplet in (9)(26)F, we find that the proton-neutron π0d(5/2)ν0d(3/2) effective force used in shell-model calculations should be reduced to properly account for the weak binding of (9)(26)F. Microscopic coupled cluster theory calculations using interactions derived from chiral effective field theory are in very good agreement with the energy of the low-lying 1(1)(+), 2(1)(+), 4(1)(+) states in (26)F. Including three-body forces and coupling to the continuum effects improve the agreement between experiment and theory as compared to the use of two-body forces only.
Published: 2013

102. Study of the neutron rich sulfure isotope 43S through intermediate energy Coulomb excitation

Author: István Kuti, L. Caceres, Zsolt Podolyak, C. Petrone, J. C. Thomas, S. Franchoo, S. M. Lukyanov, D. Sohler, R. Gillibert, E. Wilson, T. Roger, Megumi Niikura, J. Mrazek, I. Stefan, Zsolt Dombrádi, Y. E. Penionzhkevich, F. Rotaru, S. Grévy, Zs. Vajta, S. Calinescu, M. Bowry, O. Sorlin, W. N. Catford, F. Negoita, M. Stanoiu, A. Lepailleur, R. Borcea, and C. Borcea
Subjects: History, Spectrometer, Isotope, Chemistry, SHELL model, Fizikai tudományok, Coulomb excitation, Computer Science Applications, Education, medicine.anatomical_structure, Intermediate energy, Fragmentation (mass spectrometry), Természettudományok, medicine, Neutron, Atomic physics, Nuclear Experiment, Nucleus
Abstract: The reduced transition probability B(E2: 3/2→7/2 ) has been measured in S using Coulomb excitation at intermediate energy. The nucleus of interest was produced by fragmentation of a Ca beam at GANIL. The reaction products were separated in the LISE spectrometer. After Coulomb-excitation of S in a Pb target, the γ rays emitted inflight were detected by 64 BaF detectors of the Chteau de Cristal array. The preliminary value deduced for the reduced transition probability B(E2: 3/2 →7/2 ) is in agreement with the predictions of the shell model calculations and supports a prolate-spherical shape coexistence in the S nucleus.
Published: 2013

103. 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

104. Study of the unbound nucleusN11by elastic resonance scattering

Author: Ivan Mukha, T. Lönnroth, M. J. G. Borge, V. Z. Goldberg, G. V. Rogatchev, I. N. Serikov, Thomas Nilsson, A.C. Mueller, R. Wolski, Göran Hugo Nyman, N. A. Orr, M. Lewitowicz, Leif Axelsson, D. Guillemaud-Mueller, F. Wenander, K. Riisager, Ismael Martel, Olof Tengblad, J. S. Winfield, Kjell-Mikael Källman, S. Grévy, P. Manngård, Karin Markenroth, M. G. Saint-Laurent, S. A. Fayans, O. Sorlin, and Björn Jonson
Subjects: Elastic scattering, Physics, Nuclear and High Energy Physics, medicine.anatomical_structure, Atomic orbital, Excited state, medicine, Resonance scattering, State (functional analysis), Radius, Atomic physics, Ground state, Nucleus
Abstract: Resonances in the unbound nucleus N-11 have been studied, using the resonance scattering reaction C-10+p. The data give evidence for three states above the C-10+p threshold with energies 1.30, 2.04, and 3.72 MeV. These states can be interpreted, in a potential-model analysis, as the ground state and the first two excited states with spin-parity 1/2(+), 1/2(-), and 5/2(+) arising from the shell-model orbitals 1s(1/2), Op(1/2), and Od(5/2). A narrow state superposed on a broad structure found at higher energy could be interpreted as the mirror state of the 3/2(-) in Be-11 shifted down in energy. This shift would suggest a large radius of the potential.
Published: 1996

105. B8proton halo via reaction and breakup cross section measurements

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

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

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

107. 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

108. 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

109. 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

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

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

111. 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

112. Search for superscreening effects in a superconductor

Author: F. de Oliveira Santos, B. Bastin, M. G. Saint Laurent, Vincent Tatischeff, R. Borcea, M. Lewitowicz, A. Buta, A. Coc, C. Borcea, Predrag Ujić, M. Stanoiu, A. Lepailleur, N. L. Achouri, O. Sorlin, Jürgen Kiener, Alain Pautrat, O. Kamalou, M. Assié, V. Méot, 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), Vinča Institute of Nuclear Sciences, University of Belgrade [Belgrade], Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Horia Hulubei National Institute of Physics and Nuclear Engineering (NIPNE), IFIN-HH, CSNSM AN, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de cristallographie et sciences des matériaux (CRISMAT), Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), and Normandie Université (NU)-Institut de Chimie du CNRS (INC)
Subjects: Niobium, FOS: Physical sciences, General Physics and Astronomy, chemistry.chemical_element, Lifetimes, Beta decay, Electron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Hydrostatic stellar nucleosynthesis, Widths, Double beta decay, Error bar, 0103 physical sciences, 23.40.-s, 21.10.Tg, 27.20.+n, 74.25.-q, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, Superconductivity, 010308 nuclear & particles physics, Properties of superconductors, Potential energy, 3. Good health, chemistry, Atomic physics, 6 < A < 19
Abstract: The decay of $^{19}$O($\beta^-$) and $^{19}$Ne($\beta^+$) implanted in niobium in its superconducting and metallic phase was measured using purified radioactive beams produced by the SPIRAL/GANIL facility. Half-lives and branching ratios measured in the two phases are consistent within one-sigma error bar. This measurement casts strong doubts on the predicted strong electron screening in superconductor, the so-called superscreening. The measured difference in screening potential energy is 110(90) eV for $^{19}$Ne and 400(320) eV for $^{19}$O. Precise determinations of the half-lives were obtained for $^{19}$O: 26.476(9) s and $^{19}$Ne: 17.254(5) s., Comment: 4 pages, 3 figures, accepted for publication in Physical Review Letters
Published: 2012

113. Unveiling the Intruder Deformed02+State inSi34

Author: A. Buta, R. Borcea, C. Petrone, L. Caceres, D. Lebhertz, S. Calinescu, O. Sorlin, J. C. Thomas, S. Grévy, Alfredo Poves, J. Mrazek, R. Chevrier, J. M. Daugas, S. M. Lukyanov, M. Stanoiu, F. Rotaru, D. Sohler, Frédéric Nowacki, Y. E. Penionzhkevich, C. Borcea, Zs. Dombrádi, and F. Negoita
Subjects: Czech, 010308 nuclear & particles physics, Romanian, Foundation (engineering), General Physics and Astronomy, State (functional analysis), 01 natural sciences, language.human_language, Political science, Double beta decay, 0103 physical sciences, language, 010306 general physics, Humanities
Abstract: This work has been supported by BMBF 06BN109, GA of Czech Republic 202/040791, MICINN-FPA2009-13377, CM-HEPHACOSS2009/ESP-1473 (Spain), the EC through the Eurons project Contracts No. RII3-CT-3/2004-506065, No. OTKA K68801, and No. K100835, the Bolyai Foundation, and by Romanian ANCS, CNCS UEFISCDI, Project No. PN-II-RU-TE-2011- 3-0051. R. B., A. B., F. N., and F. R. acknowledge the IN2P3/ CNRS support
Published: 2012

114. Shape coexistence at N=20 and N=28 : study of 0+2 states in $^{34}$Si and $^{44}$S

Author: F. Azaiez, F. de Oliveira, R. Chevrier, B. Bastin, J. M. Daugas, F. Rotaru, O. Sorlin, J. C. Angélique, D. Lebhertz, I. Stefan, Zs. Dombrádi, S. M. Lukyanov, R. Borcea, L. Caceres, A. Buta, L. Gaudefroy, C. Stodel, F. Negoita, N. L. Achouri, S. Grévy, C. Force, Y. E. Penionzhkevich, S. Calinescu, Dóra Sohler, C. Petrone, J. C. Thomas, Alfredo Poves, J. Mrazek, C. Borcea, F. Nowacki, M. Stanoiu, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-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), 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), Sivaramakrishnan Muralithar, Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Condensed matter physics, Island of inversion, Chemistry, Magic (programming), Nuclear structure, Theoretical models, 020206 networking & telecommunications, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 23.35.+g, 23.40.-s, 23.20.Lv, 25.70.Mn, 27.30.+t, 27.40.+z, 29.30.Kv, 0202 electrical engineering, electronic engineering, information engineering, 020201 artificial intelligence & image processing, Atomic physics, Ground state, Spectroscopy
Abstract: Expérience GANIL/LISE3/EXOGAM; International audience; It is well known that the nuclear shell structure changes for the most exotic nuclei. One of the consequences ofthis phenomenon is the modification of the "classical" magic numbers, as experimentally observed at N = 20 and N = 28.Nevertheless, the mechanisms responsible for such changes are still under discussion and more experimental information isneeded to better constrain the theoretical models. In these proceedings, we report on the discovery and the experimental studyby precise spectroscopy experiments of the 0+2 state in 34Si and 44S. The 34Si is located between the magic spherical 36S andthe deformed 32Mg, member of the so-called island of inversion, whereas 44S is located between the magic spherical 48Caand the deformed 42Si. Therefore, the structure of these nuclei, and in particular the phenomenon of shape coexistence, isof crucial importance to understand how the intruder configurations progressively dominate the ground state structure of themost exotic nuclei at both N = 20 and N = 28.
Published: 2012

115. Spectroscopy of26F

Author: F. Azaiez, C. N. Timis, D. Guillemaud-Mueller, M. Stanoiu, G. Sletten, B. A. Brown, P. Roussel-Chomaz, J. Mrazek, Zs. Podolyák, F. Ibrahim, M. G. Porquet, Zs. Fülöp, S. M. Lukyanov, Ch. Bourgeois, Z. Elekes, A. Krasznahorkay, F. Negoita, H. Savajols, M. G. Saint-Laurent, O. Sorlin, S. Grévy, Zs. Dombrádi, János Timár, M. Lewitowicz, Andras Kerek, Yu. E. Penionzhkevich, C. Borcea, Dóra Sohler, 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), CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM)
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, SHELL model, 13.75.Cs, 13.85.-t, 23.20.Lv, 21.60.Cs, Parity (physics), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, medicine.anatomical_structure, Excited state, 0103 physical sciences, medicine, Atomic physics, 010306 general physics, Spectroscopy, Ground state, Nuclear Experiment, Nucleus
Abstract: The structure of the weakly-bound $^{26}_{\;\;9}$F$_{17}$ odd-odd nucleus, produced from $^{27,28}$Na nuclei, has been investigated at GANIL by means of the in-beam $\gamma$-ray spectroscopy technique. A single $\gamma$-line is observed at 657(7) keV in $^{26}_{9}$F which has been ascribed to the decay of the excited J=$2^+$ state to the J=1$^+$ ground state. The possible presence of intruder negative parity states in $^{26}$F is also discussed., Comment: 3 pages, 1 figure, accepted for publication in Physical Review C
Published: 2012

116. Evolution of theN=50gap fromZ=30toZ=38and extrapolation toward78Ni

Author: Marie-Geneviève Porquet and O. Sorlin
Subjects: Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Nuclear Theory, Extrapolation, Shell (structure), Function (mathematics), 01 natural sciences, Spherical shell, Atomic mass, Classical mechanics, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Nuclear theory
Abstract: The evolution of the $N=50$ gap is analyzed as a function of the occupation of the proton $\ensuremath{\pi}{f}_{5/2}$ and $\ensuremath{\pi}{p}_{3/2}$ orbits. It is based on experimental atomic masses, using three different methods of one- or two-neutron separation energies of ground or isomeric states. We show that the effect of correlations, which is maximized at $Z=32$ could be misleading with respect to the determination of the size of the shell gap, especially when using the method with two-neutron separation energies. From the methods that are the least perturbed by correlations, we estimate the $N=50$ spherical shell gap in ${}_{28}^{78}$Ni${}_{50}^{}$. Whether ${}^{78}$Ni would be a rigid spherical or deformed nucleus is discussed in comparison with other nuclei in which similar nucleon-nucleon forces are at play.
Published: 2012

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

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

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

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

119. Unveiling the intruder deformed 02+ state in 34Si

Author: F, Rotaru, F, Negoita, S, Grévy, J, Mrazek, S, Lukyanov, F, Nowacki, A, Poves, O, Sorlin, C, Borcea, R, Borcea, A, Buta, L, Cáceres, S, Calinescu, R, Chevrier, Zs, Dombrádi, J M, Daugas, D, Lebhertz, Y, Penionzhkevich, C, Petrone, D, Sohler, M, Stanoiu, J C, Thomas, and UAM. Departamento de Física Teórica
Subjects: Simultaneous detection, Física, Large deformations, Electric monopole strength, Shell gap, Shell models, Weak-mixing
Abstract: The 02+ state in Si34 has been populated at the GANIL-LISE3 facility through the β decay of a newly discovered 1 + isomer in Al34 of 26(1) ms half-life. The simultaneous detection of e +e - pairs allowed the determination of the excitation energy E(02+)=2719(3)keV and the half-life T 1/2=19.4(7)ns, from which an electric monopole strength of ρ2(E0)=13.0(0.9)×10 -3 was deduced. The 21+ state is observed to decay both to the 01+ ground state and to the newly observed 02+ state [via a 607(2) keV transition] with a ratio R(21+→01+/21+→02+)=1380(717). Gathering all information, a weak mixing with the 01+ and a large deformation parameter of β=0.29(4) are found for the 02+ state, in good agreement with shell model calculations using a new sdpf-u-mix interaction allowing np-nh excitations across the N=20 shell gap, This work has been supported by BMBF 06BN109, GA of Czech Republic 202/040791, MICINN-FPA2009-13377, CM-HEPHACOSS2009/ESP-1473 (Spain), the EC through the Eurons project Contracts No. RII3-CT-3/2004-506065, No. OTKA K68801, and No. K100835, the Bolyai Foundation, and by Romanian ANCS, CNCS UEFISCDI, Project No. PN-II-RU-TE-2011- 3-0051. R. B., A. B., F. N., and F. R. acknowledge the IN2P3/ CNRS support
Published: 2012

120. Cross sections for one-neutron knock-out from $^{37}$Ca at intermediate energy

Author: G. Benzoni, Zsolt Dombrádi, C. N. Timis, W. Korten, A. Navin, F. Azaiez, D. Verney, S. J. Williams, F. Rotaru, A. Al-Khatib, H. Hübel, M. G. Saint-Laurent, P. Bringel, A. Bürger, Ch. Bourgeois, G. Sletten, P. Roussel Chomaz, O. Sorlin, C Theisen, I. Stefan, R. Borcea, F. Ibrahim, B. Bastin, Zsolt Fülöp, S. Franchoo, J. C. Dalouzy, Alejandro Algora, M. Stanoiu, C. Engelhardt, J. Mrazek, Z. Dlouhý, Dóra Sohler, Andreas Görgen, E. Clément, A. Drouart, S. Grévy, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut 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, Valence (chemistry), 010308 nuclear & particles physics, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Momentum, Cross section (physics), Excited state, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Nucleon, Nuclear Experiment, 25.60.Gc, 23.20.Lv, 27.30.+t, Energy (signal processing), Excitation
Abstract: The cross section for the knock-out of a deeply bound valence neutron from ${}^{37}$Ca at an incident beam energy of $60A\phantom{\rule{0.16em}{0ex}}\mathrm{MeV}$ has been measured along with momentum distributions of the residual nuclei and $\ensuremath{\gamma}$ rays from the de-excitation of the first excited state in ${}^{36}$Ca. As for other cases of deeply bound nucleons studied using knock-out reactions, the reduction of the measured cross section compared to theoretical predictions is stronger than those observed for near-magic stable nuclei. Both the momentum distributions and the excitation energy of the first excited state in ${}^{36}$Ca indicate a sizable $N=16$ gap.
Published: 2012

121. 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

122. 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

123. Publisher’s Note: Emergence of theN=16shell gap in21O [Phys. Rev. C84, 011301(R) (2011)]

Author: B. Fernandez-Dominguez, J. S. Thomas, W. N. Catford, F. Delaunay, S. M. Brown, N. A. Orr, M. Rejmund, M. Labiche, M. Chartier, N. L. Achouri, H. Al Falou, N. I. Ashwood, D. Beaumel, Y. Blumenfeld, B. A. Brown, R. Chapman, N. Curtis, C. Force, G. de France, S. Franchoo, J. Guillot, P. Haigh, F. Hammache, V. Lapoux, R. C. Lemmon, F. Marechal, A. M. Moro, X. Mougeot, B. Mouginot, L. Nalpas, A. Navin, N. Patterson, B. Pietras, E. C. Pollacco, A. Leprince, A. Ramus, J. A. Scarpaci, N. de Sereville, I. Stephan, O. Sorlin, and G. L. Wilson
Subjects: Nuclear physics, Physics, Nuclear reaction, Nuclear and High Energy Physics, Light nucleus, Mathematical model, Isotope, Excited state, Shell (structure), Atomic physics, Isotopes of oxygen, Radioactive decay
Published: 2011

124. Indirect study of 60Fe(n,\gamma )61Fe via the transfer reaction 60Fe(d,p\gamma )61Fe

Author: Sandra Giron, F. Hammache, Nicolas de Sereville, D. Beaumel, Geoffroy Burgunder, Lucia Caceres, Gilbert Duchêne, Emmanuel Clément, Beatriz Fernandez, Freddy Flavigny, Gilles De France, S. Franchoo, Daniel Galaviz Redondo, Leandro Gasques, Julien Gibelin, Alain Gilibert, Stéphane Grevy, Jacques Guillot, Michael Heil, Jurgen Kiener, Valérie Lapoux, F. Marechal, A. Matta, Iolanda Matea, Mohamad Moukaddam, Laurent Nalpas, L. Perrot, Alexandre Obertelli, Riccardo Raabe, Pierre Roussel, J.A. Scarpaci, O. Sorlin, Iulian Stephan, Christelle Stoedel, M. Takechi, J.C. Thomas, and Yasuhiro Togano
Subjects: Transfer (group theory), Chemistry, Physical chemistry
Published: 2011

125. Emergence of theN=16shell gap inO21

Author: B. Fernández-Domínguez, J. S. Thomas, W. N. Catford, F. Delaunay, S. M. Brown, N. A. Orr, M. Rejmund, M. Labiche, M. Chartier, N. L. Achouri, H. Al Falou, N. I. Ashwood, D. Beaumel, Y. Blumenfeld, B. A. Brown, R. Chapman, N. Curtis, C. Force, G. de France, S. Franchoo, J. Guillot, P. Haigh, F. Hammache, V. Lapoux, R. C. Lemmon, F. Maréchal, A. M. Moro, X. Mougeot, B. Mouginot, L. Nalpas, A. Navin, N. Patterson, B. Pietras, E. C. Pollacco, A. Leprince, A. Ramus, J. A. Scarpaci, N. de Séréville, I. Stephan, O. Sorlin, and G. L. Wilson
Subjects: Physics, Radioactive ion beams, Nuclear and High Energy Physics, Light nucleus, 010308 nuclear & particles physics, 0103 physical sciences, SHELL model, Shell (structure), Atomic physics, 010306 general physics, GeneralLiterature_REFERENCE(e.g.,dictionaries,encyclopedias,glossaries), 01 natural sciences
Abstract: This is the publisher's version, also available electronically from http://journals.aps.org/prc/abstract/10.1103/PhysRevC.84.011301.
Published: 2011

126. β-decay measurements forN>40Mn nuclei and inference of collectivity for neutron-rich Fe isotopes

Author: C. R. Bingham, F. Becker, F. de Oliveira Santos, Georgi P. Georgiev, I. Matea, O. Roig, Ch. Stodel, H. Grawe, Robert Grzywacz, M. Lewitowicz, M. Sawicka, J. Giovinazzo, G. Belier, E. Bouchez, E. Dragulescu, D. Verney, F. Ibrahim, J. Libert, M. Pfützner, M. Stanoiu, K. P. Rykaczewski, P. Mayet, J. P. Delaroche, O. Perru, F. Hammache, V. Méot, A. Buta, J. E. Sauvestre, Ch. Theisen, J. Żylicz, Michel Girod, R. Borcea, O. Sorlin, I. Stefan, F. Negoita, M. G. Saint-Laurent, and J. M. Daugas
Subjects: Physics, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, Neutron emission, Branching fraction, 7. Clean energy, 01 natural sciences, Nuclear physics, Neutron number, Isotopes of vanadium, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Delayed neutron, Radioactive decay
Abstract: A decay spectroscopic study of the neutron-rich isotopes has been performed using fragmentation of a 86Kr primary beam. Fragments from this reaction have been selected by the LISE2000 spectrometer at the Grand Acc el erateur National d Ions Lourds (GANIL). Half-lives of 29 isotopes, including the first ones identified for 61Ti (15 4 ms), 64V (19 8 ms), and 71Fe (28 5 ms), have been determined and compared with model predictions. 67,68Mn -delayed rays were observed for the first time. The branching for the -delayed neutron emission was measured to be greater than 10(5)% in the 67Mn decay. The 67Fe isomeric level is firmly determined at higher energy than assigned in previous works. The excitation energies of the first (2+) and (4+) states of 68Fe are suggested to lie at 522(1) and 1389(1) keV, respectively, thus bringing confirmation of assignments based on in-beam -ray spectroscopy. Beyond-mean-field calculations with the Gogny D1S force have been performed for even-mass nuclei through the Fe isotopic chain. Not only 68Fe but most of the neutron-rich Fe isotopes with neutron numbers below N = 50 are interpreted as soft rotors. The calculated mean occupancy of the neutron g9/2 and d5/2 orbitals in correlated ground statesmore » is steadily growing with increasing neutron number throughout the isotopic chain. Interpretation of 67Fe data is based upon the present calculations for the 66Fe and 68Fe even cores.« less
Published: 2011

127. Astrophysical($\alpha$, $\gamma$) reaction in inverse kinematics; Electron screening effect in the beta-decay

Author: Vincent Tatischeff, O. Sorlin, Paraskevi Demetriou, A. Buta, M. A. Amthor, T. J. Mertzimekis, C. Borcea, R. Borcea, Alain Pautrat, O. Kamalou, L. Caceres, A. Lefebvre-Schuhl, Predrag Ujić, I. Deloncle, B. Bastin, Sotirios Harissopulos, C. Stodel, Eric Clément, A. Coc, M. G. Saint-Laurent, L. Achouri, M. Lewitowicz, F. de Oliveira, A. Spyrou, S. Grévy, L Perot, M. Assié, V. Méot, L. Gaudefroy, A. Lagoyannis, Jürgen Kiener, M. Stanoiu, A. Lepailleur, 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), CSNSM AN, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Physique Nucléaire d'Orsay (IPNO), 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), Laboratoire de cristallographie et sciences des matériaux (CRISMAT), École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC), CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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), Vinča Institute of Nuclear Sciences, University of Belgrade [Belgrade], National Center for Scientific Research 'Demokritos' (NCSR), National Superconducting Cyclotron Laboratory (NSCL), Michigan State University [East Lansing], Michigan State University System-Michigan State University System, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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), IFIN-HH, Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and Direction des Applications Militaires (DAM)
Subjects: History, Particle physics and field theory, Nuclear physics, Electron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Education, Ion, symbols.namesake, Astrophysics and astroparticles, 0103 physical sciences, Coulomb, Nuclear fusion, 010306 general physics, Debye, Superconductivity, Physics, 010308 nuclear & particles physics, Screening effect, Computer Science Applications, 13. Climate action, symbols, 23.40.-s, 25.75.-q, 21.60.Gx, 27.10.+h, 24.10.Ht, 95.30.Cq, Atomic physics, Beam (structure)
Abstract: International audience; The abundance calculations of the p-nuclei produced in explosive stellar sites rely on the Hauser-Feshbach (HF) theory with the alpha-article optical model potential (α-OMP) one of its major ingredients. To date, most of the (α, γ) cross sections measured show that HF calculations can be wrong by a factor of ten or more especially when phenomenological α-OMP are employed. To investigate the relevant uncertainties entering the HF calculations and furthermore develop global microscopic α-OMPs, systematic (α, γ) cross-section measurements are necessary. This led us to perform a feasibility study of (α, γ) measurements in inverse kinematics that will allow us to employ also radioactive beams in the future. Hence, the 4He(78Kr,γ)82Sr reaction was studied using the LISE3 spectrometer to separate the 82Sr recoils from the primary 78Kr beam. Although an excellent rejection factor > 1010 was achieved, the position of the ions of interest was unexpectedly masked by a secondary beam of high intensity. Given these, new setup improvements are proposed to remove the pollutant ions. Recently, many experiments were conducted in order to study the influence of the environment (especially in a metallic material) on the decay probability of radioactive nuclei. Additionally, hydrogen-like fusion reactions were performed indicating a change in the cross-section due to the influence of the Coulomb field screening induced by quasi-free electrons in metals. This was explained by the Debye screening model which treats metallic electrons within Maxwell-Boltzmann statistics. We measured the decay rate of 19O in metallic, insulating and superconducting environments whereas the electrons in the superconductors should obey the Bose-Einstein statistics. The decay rate measurement was supported by a branching ratios measurement. We found that the effect on the decay rate, if any, is less than the 0.1%, far below the theoretical predictions.
Published: 2011

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

Author: S. M. Lukyanov, Ch. Bourgeois, O. Sorlin, X. Liang, I. Stefan, Z. Elekes, J. Mrazek, Zs. Dombrádi, A. Drouard, M. G. St-Laurent, M. Lazar, J. C. Dalouzy, Zs. Podolyák, F. Pougheon, F. Nowacki, Alfredo Poves, N. A. Orr, D. Baiborodin, P. Roussel-Chomaz, S. Grévy, Z. Dlouhy, S. Iacob, István Kuti, L. Caceres, A. Buta, F. Negoita, J. C. Angélique, B. Bastin, S. Franchoo, D. Sohler, L. Gaudefroy, A. Bürger, R. Borcea, L. Nalpas, Yu.E. Penionzkhevitch, F. Azaiez, R. Chapman, N. L. Achouri, E. Liénard, B. Laurent, M. Stanoiu, Noyaux exotiques (NEX), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear reaction, Nuclear and High Energy Physics, Astrophysics::High Energy Astrophysical Phenomena, Hadron, Nuclear Theory, Fizikai tudományok, Shell closures, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Knockout reactions, 7. Clean energy, 01 natural sciences, Természettudományok, 0103 physical sciences, Neutron, Isotopes of silicon, Nuclear structure, 010306 general physics, Spectroscopy, Nuclear Experiment, Neutron-rich Si nuclei, Physics, 010308 nuclear & particles physics, Island of inversion, Excited state, Atomic physics, Ground state
Abstract: Expérience GANIL/SISSI/SPEG; International audience; The structure of the very neutron-rich nuclei 39Si and 41Si has been investigated via in-beam γ -ray spectroscopy and few-nucleon knockout from radioactive beams. The observation of low-lying states in 39Si is a clear evidence for a drastic lowering of the intruder neutron 3/2− state when going from Z = 20 to Z = 14. The energy of the only γ -ray transition (672(14) keV) observed in 41Si is significantly lower than that of the first excited state in 47Ca (2014 keV) suggesting a deformed ground state for 41Si. These results are consistent with large-scale shell-model calculations implying that strong proton- neutron correlations are the main reason for the lowering of the intruder configurations over the normal ones.
Published: 2011

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

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

130. High-energy breakup ofLi6as a tool to study the Big Bang nucleosynthesis reactionH2(α,γ)Li6

Author: F. Schümann, F. Hammache, Andreas Wagner, J. Kiener, Naohito Iwasa, Kilian Eberhard Schwarz, D. Galaviz, Peter Mohr, Stefan Typel, B. Kohlmeyer, M. Caamaño, Vincent Tatischeff, P. Senger, F. Uhlig, O. Sorlin, W. Walus, Michael Heil, D. Cortina, E. Schwab, K. Sümmerer, F. Attallah, Elisabeth Vangioni, J. P. Thibaud, Hans Geissel, Margareta Hellström, A. Coc, and P. Koczon
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Scattering, Isotopes of lithium, Coulomb excitation, 01 natural sciences, Nuclear physics, Big Bang nucleosynthesis, Nucleosynthesis, 0103 physical sciences, Coulomb, 010306 general physics, Radioactive decay
Abstract: The recently claimed observations of non-negligible amounts of $^{6}\mathrm{Li}$ in old halo stars have renewed interest in the Big Bang nucleosynthesis (BBN) of $^{6}\mathrm{Li}$. One important ingredient in the predicted BBN abundance of $^{6}\mathrm{Li}$ is the low-energy $^{2}\mathrm{H}$($\ensuremath{\alpha}$,$\ensuremath{\gamma}$)$^{6}\mathrm{Li}$ cross section. Up to now, the only available experimental result for this cross section showed an almost constant astrophysical $S$ factor below $400$ keV, contrary to theoretical expectations. We report on a new measurement of the $^{2}\mathrm{H}$($\ensuremath{\alpha}$,$\ensuremath{\gamma}$)$^{6}\mathrm{Li}$ reaction using the breakup of $^{6}\mathrm{Li}$ at 150 $A $ MeV. Even though we cannot separate experimentally the Coulomb contribution from the nuclear one, we find clear evidence for Coulomb-nuclear interference by analyzing the scattering angular distributions. This is in line with our theoretical description, which indicates a drop of the ${S}_{24}$ factor at low energies as predicted also by most other models. Consequently, we find even lower upper limits for the calculated primordial $^{6}\mathrm{Li}$ abundance than before.
Published: 2010

131. New measurement of the cross section of the big bang nucleosynthesis reaction $D(\alpha,\gamma)^{6}Li$ and its astrophysical impact

Author: A. Walus, Stefan Typel, F. Uhlig, Peter J. Mohr, J. P. Thibaud, Margareta Hellström, Naohito Iwasa, J. Kiener, F. Attallah, O. Sorlin, Kilian Eberhard Schwarz, K. Sümmerer, D. Cortina-Gil, E. Schwab, M. Caamaño, Vincent Tatischeff, Hans Geissel, P. Koczon, B. Kohlmeyer, Arne Wagner, Daniel Galaviz, F. Hammache, F. Schümann, A. Coc, and Peter Senger
Subjects: Physics, Cross section (physics), Stellar nucleosynthesis, Big Bang nucleosynthesis, Nucleosynthesis, Astrophysics, Alpha (navigation)
Published: 2010

132. Publisher’s Note:gfactor of theCl44ground state: Probing the reducedZ=16andN=28gaps [Phys. Rev. C81, 034308 (2010)]

Author: J. C. Thomas, M. De Rydt, D. Kameda, J. M. Daugas, F. de Oliveira Santos, P. Morel, G. Neyens, V. Kumar, R. Lozeva, S. Grévy, P. Vingerhoets, O. Sorlin, T. J. Mertzimekis, L. Gaudefroy, N. Vermeulen, Takashi Nagatomo, C. Stodel, and L. Perrot
Subjects: Physics, Nuclear and High Energy Physics, Landé g-factor, g factor, Isotopes of chlorine, Resonance, Atomic physics, Ground state, Dimensionless quantity
Published: 2010

133. Migration of Nuclear Shell Gaps Studied in thed(Ne24,pγ)Ne25Reaction

Author: M. Rejmund, J.M. Casadjian, Luis Caballero, V. P. E. Pucknell, W. N. Catford, S.D. Pain, N. A. Orr, N.L. Achouri, B. Fernández-Domínguez, Ch. Theisen, W. Gelletly, N. Curtis, C. N. Timis, N. Amzal, H. Savajols, Marielle Chartier, N. I. Ashwood, T. D. Baldwin, D. D. Warner, O. Sorlin, Robert Chapman, M. Burns, X. Liang, B. Rubio, K. M. Spohr, Roy Crawford Lemmon, M. Freer, and M. Labiche
Subjects: Physics, Nuclear reaction, Angular momentum, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Hadron, General Physics and Astronomy, Elementary particle, 01 natural sciences, Nuclear physics, Baryon, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Nucleon, Radioactive decay
Abstract: The transfer of neutrons onto 24Ne has been measured using a reaccelerated radioactive beam of 24Ne to study the (d,p) reaction in inverse kinematics. The unusual raising of the first 3/2+ level in 25Ne and its significance in terms of the migration of the neutron magic number from N=20 to N=16 is put on a firm footing by confirmation of this state's identity. The raised 3/2+ level is observed simultaneously with the intruder negative parity 7/2- and 3/2- levels, providing evidence for the reduction in the N=20 gap. The coincident gamma-ray decays allowed the assignment of spins as well as the transferred orbital angular momentum. The excitation energy of the 3/2+ state shows that the established USD shell model breaks down well within the sd model space and requires a revised treatment of the proton-neutron monopole interaction.
Published: 2010

134. Study of the N = 28 shell closure in the Ar isotopic chain

Author: L. Gaudefroy, O. Sorlin, D. Beaumel, Y. Blumenfeld, Z. Dombrádi, S. Fortier, S. Franchoo, M. Gélin, J. Gibelin, S. Grévy, F. Hammache, F. Ibrahim, K. Kemper, K. L. Kratz, S. M. Lukyanov, C. Monrozeau, L. Nalpas, F. Nowacki, A. N. Ostrowski, Yu. -E. Penionzhkevich, E. Pollacco, P. Roussel-Chomaz, E. Rich, J. A. Scarpaci, M. G. St. Laurent, T. Rauscher, D. Sohler, M. Stanoiu, E. Tryggestad, and D. Verney
Published: 2010

135. gfactor of theCl44ground state: Probing the reducedZ=16andN=28gaps

Author: P. Vingerhoets, J. C. Thomas, Gerda Neyens, R. Lozeva, J. M. Daugas, O. Sorlin, L. Perrot, T. J. Mertzimekis, V. Kumar, N. Vermeulen, S. Grévy, Daisuke Kameda, M. De Rydt, T. Nagatomo, L. Gaudefroy, C. Stodel, P. Morel, and F. de Oliveira Santos
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Landé g-factor, Hadron, Elementary particle, 01 natural sciences, Baryon, 0103 physical sciences, Atomic physics, 010306 general physics, Nucleon, Ground state, Hyperfine structure, Dimensionless quantity
Abstract: The $g$ factor of the $^{44}\mathrm{Cl}$ ground state is measured at the LISE fragment separator at the Grand Acc\'el\'erateur National d'Ions Lourds (GANIL) using the $\ensuremath{\beta}$ nuclear magnetic resonance technique, resulting in $g$($^{44}\mathrm{Cl}$)$=(\ensuremath{-})0.2749(2)$. An analysis of the $g$ factor value and of the theoretical level scheme in the shell-model framework reveals the presence of odd-proton ${s}_{1/2}$ configurations and neutron excitation across the $N=28$ shell gap in the ground state of $^{44}\mathrm{Cl}$. In addition, the measured $g$ factor strongly supports a ${2}^{\ensuremath{-}}$ spin assignment for the $^{44}\mathrm{Cl}$ ground state.
Published: 2010

136. Shell and Shapes in the N = 28 Isotones

Author: L. Cáceres, Zs. Dombrádi, C. Force, L. Gaudefroy, S. Grévy, F. Nowacki, D. Sohler, O. Sorlin, Hajime Susa, Marcel Arnould, Sydney Gales, Tohru Motobayashi, Christoph Scheidenberger, Hiroaki Utsunomiya, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institute for Nuclear Research [Budapest] (ATOMKI), Hungarian Academy of Sciences (MTA), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H. Susa, M. Arnould, S. Gales, T. Motobayashi, C. Scheidenberger, H. Utsunomiya, Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Isomeric decay, 21.10.Jx, 21.10.Pc, 21.10.Re, 23.35.+g, Nuclear Theory, Hadron, quenching, Fermion, shape coexistence, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Atomic orbital, Quadrupole, Neutron, Isotopes of silicon, Atomic physics, Nuclear Experiment, Nucleon, Ground state
Abstract: International audience; New experimental results on 43S and 44S reveal that these nuclei are located in a transitional region of shape coexistence between the spherical 48Ca and the oblate 42Si. The origin of the deformation is discussed in terms of the evolution of the single particle energy levels leading to the compression of the energy difference of the orbitals in the sd and pf shells for protons and neutrons, respectively. Therefore, due to quadrupole excitations across the Z = 14 and N = 28 gaps, the intruder configuration in the neutron rich S isotopes became the ground state.
Published: 2010

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

Author: S. Giron, F. Hammache, N. de Séréville, D. Beaumel, J. Burgunder, L. Caceres, E. Clement, G. Duchene, F. Flavigny, G. De France, S. Franchoo, B. Fernandez, D. Galaviz-Redondo, L. Gasques, J. Gibelin, A. Gillibert, S. Grevy, J. Guillot, M. Heil, J. Kiener, V. Lapoux, F. Maréchal, A. Matta, Y. Matea, M. Moukaddam, L. Nalpas, A. Obertelli, L. Perrot, R. Raabe, J. A. Scarpaci, O. Sorlin, I. Stefan, C. Stoedel, M. Takechi, J. C. Thomas, Y. Togano, Claudi Spitaleri, Claus Rolfs, and Rosario G. Pizzone
Subjects: Nuclear reaction, Physics, Angular momentum, 010308 nuclear & particles physics, Context (language use), 7. Clean energy, 01 natural sciences, Nuclear physics, Supernova, Nucleosynthesis, Excited state, 0103 physical sciences, Atomic physics, Radioactive decay, Excitation
Abstract: INTEGRAL and RHESSI spacecrafts recently detected the 1.173 and 1.333 MeV γ‐ray lines coming from the 60Fe—60Co—60Ni radioactive decay chain. The long lived isotope 60Fe (T1/2 = 1.5 106y) is believed to be primarily produced in core‐collapse supernovae. However the interpretation of the observations is difficult because of the large uncertainties concerning 59Fe(n,γ)60Fe and 60Fe(n,γ)61Fe cross sections, involved in 60Fe nucleosynthesis.The direct component of the 60Fe(n,γ)61Fe reaction was studied indirectly via the d(60Fe,pγ)61Fe transfer reaction. The experiment performed in GANIL in spring 2009 will allow to determine the excitation energies of the populated excited states of 61Fe and for the first time their spectroscopic factors as well as their transfer angular momentum.I will first give an overview of the astrophysical context, then I will describe the experimental setup and finally present some preliminary results of the ongoing analysis.
Published: 2010

138. Breakdown of theZ=8Shell Closure in UnboundO12and its Mirror Symmetry

Author: H. Okamura, O. Sorlin, I. Stefan, D. Beaumel, Maya Takechi, P. Roussel-Chomaz, Hidetada Baba, Xavier Mougeot, Shin'ichiro Michimasa, Hironori Iwasaki, D. Suzuki, I. Mukha, S. Franchoo, J. Guillot, L. Nalpas, M. Assié, Fairouz Hammache, J. A. Scarpaci, Hideaki Otsu, A. Gillibert, F. Maréchal, V. Lapoux, A. Ramus, A. Drouart, Hiroyoshi Sakurai, E. C. Pollacco, N. Keeley, Y. Blumenfeld, and N. de Séréville
Subjects: Physics, Nuclear reaction, Proton, 010308 nuclear & particles physics, Nuclear Theory, Hadron, General Physics and Astronomy, Elementary particle, 01 natural sciences, Excited state, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Isotopes of beryllium, Nucleon, Mirror symmetry
Abstract: An excited state in the proton-rich unbound nucleus $^{12}\mathrm{O}$ was identified at 1.8(4) MeV via missing-mass spectroscopy with the $^{14}\mathrm{O}(p,t)$ reaction at $51\text{ }\text{ }A\mathrm{MeV}$. The spin-parity of the state was determined to be ${0}^{+}$ or ${2}^{+}$ by comparing the measured differential cross sections with distorted-wave calculations. The lowered location of the excited state in $^{12}\mathrm{O}$ indicates the breakdown of the major shell closure at $Z=8$ near the proton drip line. This demonstrates the persistence of mirror symmetry in the disappearance of the magic number 8 between $^{12}\mathrm{O}$ and its mirror partner $^{12}\mathrm{Be}$.
Published: 2009

139. Migration of nuclear shell gaps studied in the d(24Ne,pγ)25Ne reaction

Author: W N, Catford, C N, Timis, R C, Lemmon, M, Labiche, N A, Orr, B, Fernández-Domínguez, R, Chapman, M, Freer, M, Chartier, H, Savajols, M, Rejmund, N L, Achouri, N, Amzal, N I, Ashwood, T D, Baldwin, M, Burns, L, Caballero, J M, Casadjian, N, Curtis, G, de France, W, Gelletly, X, Liang, S D, Pain, V P E, Pucknell, B, Rubio, O, Sorlin, K, Spohr, Ch, Theisen, and D D, Warner
Abstract: The transfer of neutrons onto 24Ne has been measured using a reaccelerated radioactive beam of 24Ne to study the (d,p) reaction in inverse kinematics. The unusual raising of the first 3/2+ level in 25Ne and its significance in terms of the migration of the neutron magic number from N=20 to N=16 is put on a firm footing by confirmation of this state's identity. The raised 3/2+ level is observed simultaneously with the intruder negative parity 7/2- and 3/2- levels, providing evidence for the reduction in the N=20 gap. The coincident gamma-ray decays allowed the assignment of spins as well as the transferred orbital angular momentum. The excitation energy of the 3/2+ state shows that the established USD shell model breaks down well within the sd model space and requires a revised treatment of the proton-neutron monopole interaction.
Published: 2009

140. TIARA: a large solid angle silicon array for direct reaction studies with radioactive beams

Author: V. F. E. Pucknell, Y. Merrer, S. Appleton, R. Chapman, W. Gelletly, N. Curtis, B. Lecornu, G. Voltolini, G. Moores, W. N. Catford, L. Olivier, H. Savajols, J.M. Casadjian, M. Rejmund, C. Marry, D. D. Warner, G. Iltis, Marielle Chartier, N. I. Ashwood, N. L. Achouri, S.D. Pain, B. Raine, B. Fernández-Domínguez, Ch. Theisen, M. Burns, X. Liang, Martin Freer, T. D. Baldwin, C. N. Timis, O. Sorlin, Julien Gautier, N. A. Orr, Luis Caballero, J. Cacitti, Berta Rubio, Roy Crawford Lemmon, M. Labiche, F. Saillant, N. Amzal, K. Faiz, K. M. Spohr, Nuclear Physics Group, STFC Daresbury Laboratory, Department of Engineering and Science, University of the West of Scotland (UWS), Department of Physics, University of Surrey (UNIS), 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), Oliver Lodge Laboratory, University of Liverpool, School of Physics and Astronomy, University of Birmingham [Birmingham], Instituto de Fisica Corpuscular (IFIC), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)-Universitat de València (UV), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Nuclear and High Energy Physics, Proton, Physics::Instrumentation and Detectors, Position sensitive silicon detectors, FOS: Physical sciences, Kinematics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Instrumentation, Physics, Spectrometer, Inverse kinematics, 010308 nuclear & particles physics, Nucleon transfer reactions, Detector, Solid angle, 3. Good health, Excited state, Ground state, Radioactive beams
Abstract: A compact, quasi-4 pi position sensitive silicon array. TIARA, designed to study direct reactions induced by radioactive beams in inverse kinematics is described here. The Transfer and Inelastic All-angle Reaction Array (TIARA) consists of 8 resistive charge division detectors forming an octagonal barrel around the target and a set of double-sided silicon-strip annular detectors positioned at each end of the barrel. The detector was coupled to the gamma-ray array EXOGAM and the spectrometer VAMOS at the GANIL Laboratory to demonstrate the potential of such an apparatus with radioactive beams. The N-14(d,p)N-15 reaction, well known in direct kinematics, has been carried out in inverse kinematics for that purpose. The observation of the N-15 ground state and excited states at 7.16 and 7.86 MeV is presented here as well as the comparison of the measured proton angular distributions with DWBA calculations. Transferred l-values are in very good agreement with both theoretical calculations and previous experimental results obtained in direct kinematics., The collaboration wishes to thank the GANIL cyclotron operations crew for delivering the 14N beam.Partial support from the European Union under contract No506065 and from the Spanish MEC Grant FPA2005-03993 are also gratefully acknowledged. The development and construction of TIARA were financed by an EPSRC(UK) grant.
Published: 2009

141. Breakdown of the Z=8 shell closure in unbound 12O and its mirror symmetry

Author: D, Suzuki, H, Iwasaki, D, Beaumel, L, Nalpas, E, Pollacco, M, Assié, H, Baba, Y, Blumenfeld, N, De Séréville, A, Drouart, S, Franchoo, A, Gillibert, J, Guillot, F, Hammache, N, Keeley, V, Lapoux, F, Maréchal, S, Michimasa, X, Mougeot, I, Mukha, H, Okamura, H, Otsu, A, Ramus, P, Roussel-Chomaz, H, Sakurai, J-A, Scarpaci, O, Sorlin, I, Stefan, and M, Takechi
Abstract: An excited state in the proton-rich unbound nucleus 12O was identified at 1.8(4) MeV via missing-mass spectroscopy with the 14O(p,t) reaction at 51 AMeV. The spin-parity of the state was determined to be 0+ or 2+ by comparing the measured differential cross sections with distorted-wave calculations. The lowered location of the excited state in 12O indicates the breakdown of the major shell closure at Z=8 near the proton drip line. This demonstrates the persistence of mirror symmetry in the disappearance of the magic number 8 between 12O and its mirror partner 12Be.
Published: 2009

142. Discovery of a New Broad Resonance inNe19: Implications for the Destruction of the Cosmicγ-Ray EmitterF18

Author: A. Coc, M. Stanoiu, I. Stefan, F. Negoita, R. Borcea, Jürgen Kiener, J. C. Dalouzy, F. de Oliveira Santos, A. M. Sánchez-Benítez, P. J. Woods, N. de Séréville, C. Borcea, H. Benhabiles, P. Bourgault, A. Damman, A. Buta, Marialuisa Aliotta, O. Sorlin, L. Achouri, M. G. Pellegriti, Carmen Angulo, F. de Grancey, and Thomas Davinson
Subjects: Physics, Degree (graph theory), 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Zero (complex analysis), General Physics and Astronomy, Resonance, Inelastic scattering, 01 natural sciences, Angular correlation, 0103 physical sciences, Atomic physics, Proton emission, Nuclear Experiment, 010306 general physics, Spin-½
Abstract: Six proton-emitting states in $^{19}\mathrm{Ne}$ were studied through the inelastic scattering reaction $\mathrm{H}(^{19}\mathrm{Ne},p)^{19}\mathrm{Ne}^{*}(p)^{18}\mathrm{F}$. Their energies and widths were derived from the protons detected at zero degree, while proton-proton angular correlations between the detector at zero degree and a segmented annular detector were used to determine their spin value. In addition to the known states, a new broad $J=\frac{1}{2}$ resonance has been evidenced at ${E}_{x}\ensuremath{\approx}7.9\text{ }\text{ }\mathrm{MeV}$, $\ensuremath{\approx}1.45\text{ }\text{ }\mathrm{MeV}$ above the proton emission threshold. By introducing this resonance, the $^{18}\mathrm{F}(p,\ensuremath{\alpha})^{15}\mathrm{O}$ destruction rate in novae is significantly enhanced. This reduces the chance to observe the cosmic $\ensuremath{\gamma}$-ray emission of $^{18}\mathrm{F}$ from novae in space telescopes.
Published: 2009

143. Nuclear 'bubble' structure inSi34

Author: Elias Khan, L. Gaudefroy, O. Sorlin, Marcella Grasso, Jorge Piekarewicz, N. Van Giai, Tamara Nikšić, and Dario Vretenar
Subjects: Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Bubble, Nuclear Theory, Structure (category theory), Nuclear structure, Charge density, 01 natural sciences, Molecular physics, Nuclear physics, Mean field theory, 0103 physical sciences, Neutron, Nuclear Experiment, 010306 general physics, Central charge
Abstract: Bubble nuclei are characterized by a depletion of their central density. Their existence is examined within three different theoretical frameworks: the shell model and nonrelativistic and relativistic microscopic mean-field approaches. We analyze 34Si and 22O as possible candidates for proton and neutron bubble nuclei, respectively. In the case of 22O, we observe a significant model dependence, thereby calling into question the bubble structure of 22O. In contrast, an overall agreement among the models is obtained for 34Si. Indeed, all models predict a central proton density depletion of about 40% and a central charge density depletion of 25%– 30%. This result provides strong evidence in favor of a proton bubble in 34Si.
Published: 2009

144. Structure of theN=27isotones derived from theAr44(d,p)Ar45reaction

Author: Yu. E. Penionzhkevich, D. Sohler, D. Beaumel, L. Nalpas, O. Sorlin, F. Hammache, F. Nowacki, S. Fortier, M. G. St. Laurent, P. Roussel-Chomaz, S. Franchoo, Zsolt Dombrádi, K. W. Kemper, M. Stanoiu, E. C. Pollacco, K. L. Kratz, Y. Blumenfeld, P. Roussel, L. Gaudefroy, Erik Tryggestad, S. Grévy, S. M. Lukyanov, and A. N. Ostrowski
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, Angular momentum, 010308 nuclear & particles physics, Nuclear Theory, Structure (category theory), 01 natural sciences, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, Neutron, Isotopes of silicon, Atomic physics, Nuclear Experiment, 010306 general physics, Radioactive decay, Excitation, Dimensionless quantity
Abstract: The $^{44}\mathrm{Ar}$($d,p$)$^{45}\mathrm{Ar}$ neutron transfer reaction was performed at $10A$ MeV. Measured excitation energies, deduced angular momenta, and spectroscopic factors of the states populated in $^{45}\mathrm{Ar}$ are reported. A satisfactory description of these properties is achieved in the shell model framework using a new $\mathit{sdpf}$ interaction. The model analysis is extended to more exotic even-$Z$ nuclei down to ${}_{14}^{41}{\mathrm{Si}}_{27}$ to study how collectivity impacts the low-lying structure of $N=27$ neutron-rich nuclei.
Published: 2008

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

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

146. EVOLUTION OF THE N = 28 SHELL CLOSURE FAR FROM STABILITY

Author: O. Sorlin
Subjects: Physics, Classical mechanics, Closure (topology), Shell (structure), Stability (probability)
Published: 2008

147. Disappearance of the $N=14$ shell gap in the C isotopic chain

Author: Zs. Podolyák, C. Borcea, F. Azaiez, J. Timár, B. A. Brown, G. Sletten, M. Stanoiu, Zs. Fülöp, P. Roussel-Chomaz, Andras Kerek, S. K. Mandal, Dóra Sohler, Yu. E. Penionzhkevich, M. Lewitowicz, A. D. Yamamoto, S. M. Lukyanov, Ch. Bourgeois, Z. Elekes, F. Ibrahim, H. Savajols, S. Grévy, A. Krasznahorkay, F. Negoita, M. G. Saint-Laurent, C. N. Timis, D. Guillemaud-Mueller, Z. Dlouhy, M. Belleguic, O. Sorlin, Zs. Dombrádi, J. Mrazek, 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), Institute for Nuclear Research [Budapest] (ATOMKI), Hungarian Academy of Sciences (MTA), 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: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, 23.20.Lv, 27.30.+t, 21.60.Cs, 25.70.Mn, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Isotopes of oxygen, Coincidence, Fragmentation (mass spectrometry), Isotopes of carbon, Excited state, 0103 physical sciences, Gamma spectroscopy, Neutron, Atomic physics, 010306 general physics, Spectroscopy, Nuclear Experiment
Abstract: Expérience GANIL, Dispositif SISSI, détécteur SPEG; The structure of $^{17-20}_{6}$C nuclei was investigated by means of the in-beam $\gamma$-ray spectroscopy technique using fragmentation reactions of radioactive beams. Based on particle-$\gamma$ and particle-$\gamma\gamma$ coincidence data, level schemes are constructed for the neutron rich $^{17-20}$C nuclei. The systematics of the first excited 2$^{+}$ states in the Carbon isotopes is extended for the first time to $A$=20 showing that in contrast to the case of the oxygen isotopes, the $N$=14 subshell closure disappears. Experimental results are compared with shell-model calculations. Agreement between them is found only if a reduced neutron--neutron effective interaction is used. Implications of this reduced interaction in some properties of weakly bound neutron-rich Carbon are discussed.
Published: 2008

148. Study of the $^{20}$O(d,t) reaction with the TIARA-MUST2-VAMOS-EXOGAM setup

Author: A. RAMUS, N. L. ACHOURI, H. AL FALOU, N. I. ASHWOOD, D. BEAUMEL, Y. BLUMENFELD, S. M. BROWN, W. N. CATFORD, R. CHAPMAN, M. CHARTIER, N. CURTIS, F. DELAUNAY, B. FERNÁNDEZ-DOMÍNGUEZ, C. FORCE, G. DE FRANCE, S. FRANCHOO, J. GUILLOT, D. GUPTA, P. HAIGH, F. HAMMACHE, M. LABICHE, V. LAPOUX, R. C. LEMMON, F. MARÉCHAL, B. MARTIN, X. MOUGEOT, B. MOUGINOT, L. NALPAS, A. NAVIN, N. A. ORR, N. PATTERSON, B. PIETRAS, E. C. POLLACCO, A. LE PRINCE, M. REJMUND, J. A. SCARPACI, N. DE SÉRÉVILLE, I. STEFAN, O. SORLIN, J. S. THOMAS, G. L. WILSON, 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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Gamma ray, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Charged particle, Nuclear physics, Angular distribution, 0103 physical sciences, Atomic physics, 010306 general physics, Nuclear Experiment, Radioactive beam
Abstract: The reaction 20 O ( d , t ) has been studied in inverse kinematics using a secondary radioactive beam produced with the SPIRAL facility at GANIL. Fragments, light charged particles and gamma rays were measured with the TIARA, MUST2, VAMOS and EXOGAM detectors and preliminary results are reported. The level scheme of 19 O is built and the spin and parity of one state is tentatively assigned using the one-neutron transfer angular distribution.
Published: 2008

149. 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

150. Gaudefroyet al.Reply

Author: D. Verney, O. Sorlin, L. Gaudefroy, Erik Tryggestad, S. Fortier, M. G. St. Laurent, Dóra Sohler, F. Ibrahim, D. Beaumel, S. Franchoo, F. Nowacki, P. Roussel-Chomaz, M. Stanoiu, J. A. Scarpaci, M. Gelin, L. Nalpas, C. Monrozeau, F. Hammache, Jorge Piekarewicz, Zsolt Dombrádi, S. Grévy, Toshio Suzuki, Alexander Ostrowski, Takaharu Otsuka, S. M. Lukyanov, Yu. E. Penionzhkevich, E. Rich, K. W. Kemper, K. L. Kratz, E. C. Pollacco, Julien Gibelin, and Y. Blumenfeld
Subjects: Physics, 010308 nuclear & particles physics, 0103 physical sciences, General Physics and Astronomy, 010306 general physics, 01 natural sciences
Published: 2007

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