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1. Study of the N = 28 shell closure in the Ar isotopic chain : A SPIRAL experiment for nuclear astrophysics

Author

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

Published
2006
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6. Permafrost weakening as a potential impact of climatic warming

Author

Fortier, S. Buteau R. and Allard, M.

Subjects
Frozen ground -- Environmental aspects, Frozen ground -- Mechanical properties, Frozen ground -- Thermal properties, Global warming -- Environmental aspects, Engineering and manufacturing industries, Science and technology
Abstract

The warming weakening of permafrost strength as a result of different scenarios of climatic warming ranging from 0 to 5[degrees]C over the next century has been predicted using a one-dimensional geothermal model. These predictions are based on the results of an intensive geotechnical program carried out in a warm ice-rich silty permafrost in Northern Quebec. The dependency of permafrost strength on temperature was assessed from cone penetration tests performed at regular intervals over a 2-month period during the seasonal warming of the upper permafrost layer in spring 2000. A thermomechanical subroutine taking into account this dependency has been then added to the one-dimensional geothermal model for the simulation of the weakening of permafrost strength as it warms. A warming rate of 0.02[degrees]C/year over the next century leads on a slow decrease in permafrost strength corresponding to a relative loss of strength of about 50%. For a warming rate of 0.05[degrees]C/year, the strength weakening is much more pronounced and almost reaches the unfrozen state at the end of the warming period corresponding to a relative loss of 98%. DOI: 10.1061/(ASCE)0887-381X(2010)24:1(1) CE Database subject headings: Freezing; Freeze and thaw: Thermal factors; Global warming; Climate changes; Canada. Author keywords: Freezing index; Thawing index; Surface n-factor; Surface temperature; Ground temperature; Thermal properties.

Published
2010

7. Properties of low-lying 9He state

Author

Golovkov, M. S., Grigorenko, L. V., Fomichev, A. S., Gorshkov, A. V., Gorshkov, V. A., Krupko, S. A., Oganessian, Yu. Ts., Rodin, A. M., Sidorchuk, S. I., Slepnev, R. S., Stepantsov, S. V., Ter-Akopian, G. M., Wolski, R., Korsheninnikov, A. A., Nikolskii, E. Yu., Kuzmin, V. A., Novatskii, B. G., Stepanov, D. N., Fortier, S., Roussel-Chomaz, P., and Mittig, W.

Published
2007
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12. Evaluation of the $^{13}$N($\alpha$,p)$^{16}$O thermonuclear reaction rate and its impact on the isotopic composition of supernova grains

Author

Meyer, A., de Séréville, N., Laird, A. M., Hammache, F., Longland, R., Lawson, T., Pignatari, M., Audouin, L., Beaumel, D., Fortier, S., Kiener, J., Lefebvre-Schuhl, A., Pellegriti, M. G., Stanoiu, M., Tatischeff, V., 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), and Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM)

Subjects
Astrophysics - Solar and Stellar Astrophysics, Nuclear Astrophysics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Nuclear Experiment
Abstract

International audience; Background: It has been recently suggested that hydrogen ingestion into the helium shell of massive stars could lead to high C13 and N15 excesses when the shock of a core-collapse supernova passes through its helium shell. This prediction questions the origin of extremely high C13 and N15 abundances observed in rare presolar SiC grains which is usually attributed to classical novae. In this context the N13(α,p)O16 reaction plays an important role since it is in competition with N13β+ decay to C13. Purpose: The N13(α,p)O16 reaction rate used in stellar evolution calculations comes from the Caughlan and Fowler compilation with very scarce information on the origin of this rate and with no associated uncertainty. The goal of this work is to provide a recommended N13(α,p)O16 reaction rate, based on available experimental data, with a meaningful statistical uncertainty. Method: Unbound nuclear states in the F17 compound nucleus were studied using the spectroscopic information of the analog states in O17 nucleus that were measured at the Tandem-Alto facility using the C13(Li7,t)O17 α-particle-transfer reaction. The α-particle spectroscopic factors were derived using a finite-range distorted-wave Born approximation analysis. This spectroscopic information was used to calculate a recommended N13(α,p)O16 reaction rate with meaningful uncertainty using a Monte Carlo approach. Results: The N13(α,p)O16 reaction rate from the present work is found to be within a factor of two of the previous evaluation in the temperature range of interest, with a typical uncertainty of a factor ≈2–3. The source of this uncertainty has been identified to come from the three main contributing resonances at Erc.m.=221, 741, and 959 keV. This new error estimation translates to an overall uncertainty in the C13 production of a factor of 50 when using the lower and upper reaction rates in the conditions relevant for the N13(α,p)O16 activation. Conclusions: The main source of uncertainty on the re-evaluated N13(α,p)O16 reaction rate currently comes from the uncertain α-particle width of relevant F17 states.

Published
2020
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17. Anisotropy of the Seebeck Coefficient in the Cuprate Superconductor YBa 2 Cu 3 O y : Fermi-Surface Reconstruction by Bidirectional Charge Order

Author

Cyr-Choinière, O., Badoux, Sven, Grissonnanche, G., Michon, B., Afshar, S., Fortier, S., Leboeuf, D., Graf, D., Day, J., Bonn, D., Hardy, W. N., Liang, R., Doiron-Leyraud, N., Taillefer, Louis, Département de physique [Sherbrooke] (UdeS), Faculté des sciences [Sherbrooke] (UdeS), Université de Sherbrooke (UdeS)-Université de Sherbrooke (UdeS), Laboratoire national des champs magnétiques intenses - Grenoble (LNCMI-G ), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), National High Magnetic Field Laboratory (NHMFL), Florida State University [Tallahassee] (FSU), Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada, and Canadian Institute for Advanced Research (CIFAR)

Subjects
[PHYS.COND.CM-S]Physics [physics]/Condensed Matter [cond-mat]/Superconductivity [cond-mat.supr-con], Condensed Matter::Superconductivity, [PHYS.COND.CM-SCE]Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el]
Abstract

International audience; The Seebeck coefficient S of the cuprate YBa2Cu3Oy was measured in magnetic fields large enough to suppress superconductivity, at hole dopings p=0.11 and p=0.12, for heat currents along the a and b directions of the orthorhombic crystal structure. For both directions, S/T decreases and becomes negative at low temperature, a signature that the Fermi surface undergoes a reconstruction due to broken translational symmetry. Above a clear threshold field, a strong new feature appears in Sb, for conduction along the b axis only. We attribute this feature to the onset of 3D-coherent unidirectional charge-density-wave modulations seen by x-ray diffraction, also along the b axis only. Because these modulations have a sharp onset temperature well below the temperature where S/T starts to drop towards negative values, we infer that they are not the cause of Fermi-surface reconstruction. Instead, the reconstruction must be caused by the quasi-2D bidirectional modulations that develop at significantly higher temperature.

Published
2017
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18. Anisotropy of the Seebeck Coefficient in the Cuprate Superconductor YBa$_{2}$Cu$_{3}$O$_{y}$: Fermi-Surface Reconstruction by Bidirectional Charge Order

Author

Cyr-Choini��re, O., Badoux, S., Grissonnanche, G., Michon, B., Afshar, S. A. A., Fortier, S., LeBoeuf, D., Graf, D., Day, J., Bonn, D. A., Hardy, W. N., Liang, R., Doiron-Leyraud, N., and Taillefer, Louis

Subjects
Superconductivity (cond-mat.supr-con), Condensed Matter - Strongly Correlated Electrons, Strongly Correlated Electrons (cond-mat.str-el), Physics, QC1-999, Condensed Matter::Superconductivity, Condensed Matter - Superconductivity, FOS: Physical sciences
Abstract

The Seebeck coefficient $S$ of the cuprate YBa$_{2}$Cu$_{3}$O$_{y}$ was measured in magnetic fields large enough to suppress superconductivity, at hole dopings $p = 0.11$ and $p = 0.12$, for heat currents along the $a$ and $b$ directions of the orthorhombic crystal structure. For both directions, $S/T$ decreases and becomes negative at low temperature, a signature that the Fermi surface undergoes a reconstruction due to broken translational symmetry. Above a clear threshold field, a strong new feature appears in $S_{\rm b}$, for conduction along the $b$ axis only. We attribute this feature to the onset of 3D-coherent unidirectional charge-density-wave modulations seen by x-ray diffraction, also along the $b$ axis only. Because these modulations have a sharp onset temperature well below the temperature where $S/T$ starts to drop towards negative values, we infer that they are not the cause of Fermi-surface reconstruction. Instead, the reconstruction must be caused by the quasi-2D bidirectional modulations that develop at significantly higher temperature., 7 pages, 5 figures

Published
2017

20. New determination of proton spectroscopic factors and reduced widths for $^{8}\mathrm{Be}$ states in the $16.5-18.0$ MeV excitation energy region via the study of the $^{7}\mathrm{Li}(^{3}\mathrm{He},d)^{8}\mathrm{Be}$ transfer reaction at ${E}_{\mathrm{lab}}=20$ MeV: Implication for the $^{7}\mathrm{Li}(p,\alpha)^{4}\mathrm{He}$ hydrogen burning reaction

Author

Belhout, A., Ouichaoui, S., Beaumevieille, H., Bouchemha, A., Bogaert, G., Fortier, S., Kiener, J., Lefebvre-Schuhl, A., Maison, J.M., Rosier, L., Rotbard, J., Tatischeff, V., Thibaud, J.P., Vernotte, J., 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 ), Institut de Physique Nucléaire de Lyon ( IPNL ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), 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), Institut de Physique Nucléaire d'Orsay (IPNO), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

International audience; The angular distributions of Be8 states in the excitation energy region Ex∼(16.5–18.2) MeV produced in the Li7(He3,d)Be8 proton transfer reaction have been measured at the Orsay 14.8−MV tandem accelerator for He2+3 ion bombarding energy, Elab=20 MeV, and forward angular range, θlab=5∘–50∘. A high energy resolution detection system composed of a split-pole magnetic spectrometer and a ΔE−E, position-sensitive drift chamber was used to record the energy spectra of outgoing deuterons. The measured cross section data for the direct reaction component have been separated from the compound nucleus one, then analyzed in the framework of the nonlocal, finite-range (FR)–distorted-wave Born approximation (DWBA) theory. New values of the C2S and (Sp1/2,Sp3/2) proton absolute and partial spectroscopic factors and related γp2(a) proton reduced widths versus the p+Li7 channel radius have been extracted for the 2+(16.626) and 2+(16.922),T=0+1 isospin-mixed loosely bound states of astrophysical interest and the 1+(17.640), T=1 unbound state of Be8. They are compared to sparse earlier experimental values and to shell-model-predicted ones from the literature, and are discussed. In particular, the status of the spectroscopic information on the 2+ isospin-mixed doublet is reviewed and updated. The application in nuclear astrophysics of the DWBA derived results is emphasized.

Published
2017
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22. Structure of Be-11 from the (p, d) reaction in inverse kinematics

Author

Winfield, JS, Fortier, S, Catford, WN, Pita, S, Orr, NA, Blumenfeld, Y, Chapman, R, Chappell, SPG, Clarke, NM, Curtis, N, Freer, M, Gales, S, Jones, KL, Langevin-Joliot, H, Laurent, H, Lhenry, I, Maison, JM, Roussel-Chomaz, P, Shawcross, M, Smith, M, Spohr, K, Suomijarvi, T, and de Vismes, A

Abstract

We have performed the 11Be(p, d) 10Be reaction in inverse kinematics. The 10Be were detected in the SPEG spectrometer and the deuterons detected in a silicon array in coincidence. The yield to the first excited state (2+) of 10Be is greater than that to the 0+ ground state, and increases with angle. Strong population of the two-alpha plus two-neutron states near 6 MeV (in the two-centre shell-model description) is observed. The ultimate goal is to study the microscopic structure of 11Be from the extracted spectroscopic factors.

Published
2016
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23. Critical Doping for the Onset of Fermi-Surface Reconstruction by Charge-Density-Wave Order in the Cuprate Superconductor La2-xSrxCuO4

Author

Badoux, S., Afshar, S. A. A., Michon, B., Ouellet, A., Fortier, S., LeBoeuf, D., Croft, T. P., Lester, C., Hayden, S. M., Takagi, H., Yamada, K., Graf, D., Doiron-Leyraud, N., and Taillefer, Louis

Subjects
Condensed Matter::Superconductivity, High Energy Physics::Experiment, Condensed Matter::Strongly Correlated Electrons
Abstract

The Seebeck coefficient S of the cuprate superconductor La2−xSrxCuO4 (LSCO) was measured in magnetic fields large enough to access the normal state at low temperatures, for a range of Sr concentrations from x ¼ 0.07 to x ¼ 0.15. For x ¼ 0.11, 0.12, 0.125, and 0.13, S=T decreases upon cooling to become negative at low temperatures. The same behavior is observed in the Hall coefficient RHðTÞ. In analogy with other hole-doped cuprates at similar hole concentrations p, the negative S and RH show that the Fermi surface of LSCO undergoes a reconstruction caused by the onset of charge-density-wave modulations. Such modulations have indeed been detected in LSCO by x-ray diffraction in precisely the same doping range. Our data show that in LSCO this Fermi-surface reconstruction is confined to 0.085

Published
2016
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24. Critical Doping for the Onset of Fermi-Surface Reconstruction by Charge-Density-Wave Order in the Cuprate Superconductor La 2 − x Sr x CuO 4

Author

Badoux, Sven, Afshar, S., Michon, B., Ouellet, A., Fortier, S., Leboeuf, D., Croft, T. P., Lester, C., Hayden, S., Takagi, H., Yamada, K., Graf, D., Doiron-Leyraud, N., Taillefer, Louis, École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom [Paris] (IMT), Magnétisme et Supraconductivité (MagSup ), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), 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 national des champs magnétiques intenses - Grenoble (LNCMI-G ), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Department of Advanced Materials, University of Tokyo, Department of Advanced Materials, Département de Physique et RQMP, and Université de Sherbrooke (UdeS)

Subjects
[PHYS.COND.CM-S]Physics [physics]/Condensed Matter [cond-mat]/Superconductivity [cond-mat.supr-con], Condensed Matter::Superconductivity, High Energy Physics::Experiment, Condensed Matter::Strongly Correlated Electrons, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], [PHYS.COND.CM-SCE]Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el]
Abstract

International audience; The Seebeck coefficient S of the cuprate superconductor La2−xSrxCuO4 (LSCO) was measured in magnetic fields large enough to access the normal state at low temperatures, for a range of Sr concentrations from x=0.07 to x=0.15. For x=0.11, 0.12, 0.125 and 0.13, S/T decreases upon cooling to become negative at low temperatures. The same behavior is observed in the Hall coefficient RH(T). In analogy with other hole-doped cuprates at similar hole concentrations p, the negative S and RH show that the Fermi surface of LSCO undergoes a reconstruction caused by the onset of charge-density-wave modulations. Such modulations have indeed been detected in LSCO by X-ray diffraction in precisely the same doping range. Our data show that in LSCO this Fermi-surface reconstruction is confined to 0.085

Published
2016
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25. [U(bipy)4]: A Mistaken Case of U0?

Author

Fortier, S, Veleta, J, Pialat, A, Le Roy, J, Ghiassi, KB, Olmstead, MM, Metta-Magaña, A, Murugesu, M, and Villagrán, D

Abstract

© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. After more than 50 years, the synthesis and electronic structure of the first and only reported "U0complex" [U(bipy)4] (1) has been reinvestigated. Additionally, its one-electron reduced product [Na(THF)6][U(bipy)4] (2) has been newly discovered. High resolution crystallographic analyses combined with magnetic and computational data show that 1 and its derivative 2 are best described as highly reduced species containing mid-to-high-valent uranium ligated by redox non-innocent ligands.

Published
2016
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26. Critical Doping for the Onset of Fermi-Surface Reconstruction by Charge-Density-Wave Order in the Cuprate Superconductor La$ _{2-x} $Sr$_{x} $CuO$ _{4}$

Author

Badoux, S., Afshar, S. A. A., Michon, B., Ouellet, A., Fortier, S., LeBoeuf, D., Croft, T. P., Lester, C., Hayden, S. M., Takagi, H., Yamada, K., Graf, D., Doiron-Leyraud, N., and Taillefer, Louis

Subjects
Superconductivity (cond-mat.supr-con), Condensed Matter - Strongly Correlated Electrons, Strongly Correlated Electrons (cond-mat.str-el), Physics, QC1-999, Condensed Matter::Superconductivity, Condensed Matter - Superconductivity, FOS: Physical sciences, High Energy Physics::Experiment, Condensed Matter::Strongly Correlated Electrons
Abstract

The Seebeck coefficient $S$ of the cuprate superconductor La$ _{2-x} $Sr$_{x} $CuO$ _{4}$ (LSCO) was measured in magnetic fields large enough to access the normal state at low temperatures, for a range of Sr concentrations from $x = 0.07$ to $x = 0.15$. For $x = 0.11$, 0.12, 0.125 and 0.13, $S/T$ decreases upon cooling to become negative at low temperatures. The same behavior is observed in the Hall coefficient $R_{H}(T)$. In analogy with other hole-doped cuprates at similar hole concentrations $p$, the negative $S$ and $R_{H}$ show that the Fermi surface of LSCO undergoes a reconstruction caused by the onset of charge-density-wave modulations. Such modulations have indeed been detected in LSCO by X-ray diffraction in precisely the same doping range. Our data show that in LSCO this Fermi-surface reconstruction is confined to $0.085 < p < 0.15$. We argue that in the field-induced normal state of LSCO, charge-density-wave order ends at a critical doping $p_{\rm CDW} = 0.15 \pm 0.005$, well below the pseudogap critical doping $p^\star \simeq 0.19$.

Published
2015

28. Indirect study of $^{12}$C($\alpha$, $\gamma$)$^{16}$O reaction

Author

Hammache, F., Oulebsir, N., Roussel, P., Pellegriti, M.G., Audouin, L., Beaumel, D., Bouda, A., Descouvemont, P., Fortier, S., Gaudefroy, L., Kiener, J., Lefebvre-Schuhl, A., Tatischeff, V., 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), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

International audience; The radiative capture reaction 12 C(α, γ) 16 O plays an important role in helium burning in massive stars and their subsequent evolution [1]. However, despite various experimental studies, the cross section of this reaction at stellar energies remains highly uncertain. The extrapolation down to stellar energy (Ecm ∼300 keV) of the measured cross sections at higher energies is made difficult by the overlap of various contributions of which some are badly known such as that of the 2 + (Ex=6.92 MeV) and 1 − (Ex=7.12 MeV) sub-threshold states of 16 O. Hence, to further investigate the contribution of these two-subthreshold resonances to the 12 C(α, γ) 16 O cross section, a new determination of their α-reduced widths and so their α-spectroscopic-factors was performed using 12 C(7 Li,t) 16 O transfer reaction measurements at two incident energies and a detailed DWBA analysis of the data [2]. The measured and calculated differential cross sections are presented as well as the obtained spectroscopic factors and the α-reduced widths as well as the assymptotic normalization constants (ANC) for the 2 + and 1 − sub-threshold states. Finally, the results obtained from the R-matrix calculations of the 12 C(α, γ) 16 O cross section using our obtained α-reduced widths for the two sub-threshold resonances are presented and discussed.

Published
2013
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30. Towards an impact evaluation framework for the collaborative information supply chain in humanitarian crisis response

Author

Meesters, Kenny, van de Walle, B.A., Comes, T., Fiedrich, F., Fortier, S., Geldermann, J., Müller, T., Center Ph. D. Students, Research Group: Information Management, and Department of Management

Subjects
requirement analysis, information supply chain, impact evaluation, user participation, system development
Abstract

Emerging technologies provide opportunities for the humanitarian responders’ community to enhance the effectiveness of their response to crisis situations. A part of this development can be contributed to a new type of information supply chains -driven by collaboration with digital, online communities- enabling organizations to make better informed decisions. However, how exactly and to what extend this collaboration impacts the decision making process is unknown. To improve these new information exchanges and the corresponding systems, an evaluation method is needed to assess the performance of these processes and systems. This paper builds on existing evaluation methods for information systems and design principles to propose such an impact evaluation framework. The proposed framework has been applied in a case study to demonstrate its potential to identify areas for further improvement in the (online) collaboration between information suppliers and users.

Published
2013

31. Revealing unexpected effects of rescue robots’ team-membership in a virtual environment

Author

Horsch, C.H.G., Smets, N.J.J.M., Neerincx, M.A., Cuijpers, R.H., Comes, T., Fiedrich, F., Fortier, S., Geldermann, J., Mueller, T., and Human Technology Interaction

Abstract

In urban search and rescue (USAR) situations resources are limited and workload is high. Robots that act as team players instead of tools could help in these situations. A Virtual Reality (VR) experiment was set up to test if team performance of a human-robot team increases when the robot act as such a team player. Three robot settings were tested ranging from the robot as a tool to the robot as a team player. Unexpectedly, team performance seemed to be the best for the tool condition. Two side-effects of increasing robot’s teammembership could explain this result: mental workload increased for the humans who had to work with the team-playing robot, whereas the tendency to share information was reduced between these humans. Future research should, thus, focus on team-memberships that improve communication and reduce cognitive workload.

Published
2013

32. Disaster in my backyard: A serious game introduction to disaster information management

Author

Meesters, Kenny, van de Walle, B.A., Comes, T., Fiedrich, F., Fortier, S., Geldermann, J., Müller, T., Center Ph. D. Students, Research Group: Information Management, and Department of Management

Subjects
Disaster management training, alternate reality game, information management training, disaster scenarios
Abstract

Disaster exercises are intended to improve disaster responses effectiveness. Exercises exist in a wide variety, ranging from table-top scenarios to full-scale disaster simulations, offering participants different learning experiences. However these exercises can be overwhelming to newcomers, especially when involving large scale simulations, reducing the effectiveness of the learning experience. In order to make the learning experiences more effective to newcomers, researchers or professionals, a new exercise is proposed. This exercise, designed as a serious game, provides a new way to introduce people to the field of disaster management in general and information management in particular. The first version of the game was played during the 2012 ISCRAM summer school where it yielded positive reactions from both novice participants and experienced professionals.

Published
2013

33. Shaping Societal Impact: between control and cooperation

Author

Messemaker, M., Wolbers, J.J., Treurniet, W., Boersma, F.K., Comes, T, Fiedrich, F, Fortier, S, Geldermann, J, Muller, T, Organization Sciences, Network Institute, and Organization & Processes of Organizing in Society (OPOS)

Subjects
SDG 17 - Partnerships for the Goals
Abstract

In our modern society, the impact of large-scale safety and security incidents can be large and diverse. Yet, this societal impact is makeable and controllable to a limited extent. At best, the effect of concrete response actions is that the direct damage is somewhat reduced and that the recovery is accelerated. Proper crisis communication can make the biggest difference with respect to overall societal impact. We argue that crisis communication must strike a balance between a directive approach of chaos, command and control and a more empathic approach of continuity, coordination and cooperation. On the basis of a concrete case we analyze how crisis communication reflects the incident response approach and how societal impact is affected.

Published
2013

34. Indirect study of the 12C(α,γ )16O reaction via the 12C(7Li, t)16O transfer reaction

Author

Oulebsir, N., Hammache, F., Roussel, Pierre, G. Pellegriti, M., Audouin, L., Beaumel, D., Bouda, A., Descouvemont, P., Fortier, S., Gaudefroy, L., Kiener, J., Lefebvre-Schuhl, A., Tatischeff, V., Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and 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)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 25.70.Hi, 25.40.Lw, 25.55.−e, 26.20.Fj
Abstract

The 12C(α,γ )16O reaction plays a crucial role in stellar evolution. The rate of this reaction determines directly the 12C-to-16O abundance ratio at the end of the helium burning phase of stars and consequently has a big effect on the subsequent nucleosynthesis and even on the evolution of massive stars. However, despite many experimental studies, the low-energy cross section of 12C(α,γ )16O remains uncertain. The extrapolation of the measured cross sections to stellar energies (E ∼ 300 keV) is made particularly difficult by the presence of the 2+ (Ex = 6.92 MeV) and 1− (Ex = 7.12 MeV) subthreshold states of 16O. To further investigate the contribution of these two subthreshold resonances to the 12C(α,γ )16O cross section, we determine their α-reduced widths via a measurement of the transfer reaction 12C(7Li, t )16O at two incident energies, 28 and 34 MeV. The uncertainties on the determined α-spectroscopic factors and the α-reduced widths were reduced thanks to a detailed distorted-wave Born approximation analysis of the transfer angular distributions measured at the two incident energies. The R-matrix calculations of 12C(α,γ )16O cross section using our obtained α-reduced widths for the 2+ and 1− subthreshold resonances lead to an E1 S factor at 300 keV of 100 ± 28 keV b, which is consistent with values obtained in most of the direct and indirect measurements as well as the NACRE collaboration compilation while the result for the E2 component SE2 (300 keV) = 50 ± 19 keV b disagrees with the NACRE adopted value .

Published
2012
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35. Study of 12C(α,γ)16O reaction via the transfer reaction 12C(7Li,t)16O

Author

Oulebsir, N., Hammache, F., Roussel, Pierre, Pellegriti, M. G., Audouin, L., Beaumel, D., Bouda, A., Fortier, S., Gaudefroy, L., Kiener, J., Lefebvre-Schuhl, A., Tatischeff, V., 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), 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), 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
[PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], [PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], [SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], [SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM]
Abstract

International audience; The 12C(a,g )16O reaction plays an important role in helium burning in massive stars and their evolution. However, despite many experimental studies, the low-energy cross section of 12C(a,g )16O remains highly uncertain. The extrapolation of the measured cross sections to stellar energies (E=300 keV) is made difficult by the presence of the two sub-threshold states at 6.92 (2+) and 7.12 (1−) MeV of 16O. In order to further investigate the contribution of these twosubthreshold resonances to the 12C(a,g )16O cross section, we performed a new determination of the a-reduced widths of the 6.92 and 7.12 MeV of 16O via a measurement of the transfer reaction 12C(7Li,t)16O at two incident energies, 34 and 28 MeV. The measured and calculated differential cross sections are presented as well as the obtained spectroscopic factors and the a-reduced widths for the 2+ and 1− sub-threshold states and their effect on the R-matrix calculations of 12C(a,g )16O.

Published
2010

36. New Study of the Astrophysical Reaction 12C($\alpha$,$\gamma$)16O via the 12C(7Li,t)16O Transfer Reaction

Author

Oulebsir, N., Hammache, F., G. Pellegriti, M., Roussel, Pierre, Audouin, L., Beaumel, D., Bouda, A., Fortier, S., Gaudefroy, L., Kiener, J., Lefebvre, A., Tatischeff, V., 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), 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), 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
Nucleon-induced transfer reactions, Origin, 97.60.Lf, 98.80.Ft, 97.10.Nf, 25.40.Hs, Black holes, [SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], formation, and abundances of the elements in the Universe, Stellar masses, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR]
Abstract

International audience; The 12C(alpha,gamma)16O reaction plays an important role in helium burning in massive stars and their evolution. However, despite many experimental studies, the low-energy cross section of 12C(alpha,gamma)16O still highly uncertain. The extrapolation of the measured cross sections to stellar energies (E~300 keV) is made difficult by the presence of the two sub-threshold states at 6.92 and 7.12 MeV of 16O. In order to further investigate the contribution of these two-subthreshold resonances to the 12C(alpha,gamma)16O cross section, we performed a new determination of the alpha -reduced widths via a measurement of the transfer reaction 12C(7Li,t)16O at two incident energies, 34 and 28 MeV. The measured and calculated differential cross sections will be presented as well as the obtained spectroscopic factors and the alpha -reduced widths

Published
2010
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37. Transfer reactions as tool for nuclear astrophysics: the 13C(a,n)16O case

Author

Hammache, F., Pellegriti, M. G., Roussel, P., Audouin, L., Beaumel, D., Pierre Descouvemont, Fortier, S., Gaudefroy, L., Kiener, J., Lefebvre-Schuhl, A., Stanoiu, M., Tatischeff, V., 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), Département d'Informatique [Bruxelles] (ULB), Faculté des Sciences [Bruxelles] (ULB), Université libre de Bruxelles (ULB)-Université libre de Bruxelles (ULB), 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 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), 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)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), 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
[PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], [SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2008

38. Decay Pattern of Pygmy States Observed in Neutron-Rich $^{26}$Ne

Author

Gibelin, J., Beaumel, D., Motobayashi, T., Blumenfeld, Y., Aoi, N., Baba, H., Elekes, Z., Fortier, S., Frascaria, N., Fukuda, N., Gomi, T., Ishikawa, K., Kondo, Y., Kubo, T., Kurita, K., Lima, V., Nakamura, T., Sato, Y., Saito, A., Scarpaci, J.-A., Takeshita, E., Takeuchi, S., Teranishi, T., Togano, Y., M. Vinodkumar, A., Yanagisawa, Y., Yoshida, K., Lion, Michel, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2008

39. Indirect study of the $^{13}$C($\alpha$,n)$^{16}$O reaction via the $^{13}$C($^{7}$Li,t)$^{17}$O transfer reaction

Author

Pellegriti, M.G., Hammache, F., Roussel, Pierre, Audouin, L., Beaumel, D., Descouvemont, P., Fortier, S., Gaudefroy, L., Kiener, J., Lefebvre-Schuhl, A., Stanoiu, M., Tatischeff, V., Vilmay, M., Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
25.70.Hi, 25.55.Hp, 26.20.-f, 27.20.+n, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

The 13C(alpha,n)16O reaction is considered the main neutron source for the s process in low mass asymptotic giant branch (AGB) stars. In the Gamow peak, the cross section sensitively depends on the 1/2+ subthreshold state of 17O (Ex=6.356 MeV). In this work, we determined the astrophysical S factor through an evaluation of the alpha spectroscopic factor and the corresponding asymptotic normalization factor (ANC) of the 6.356 MeV state using the transfer reaction 13C(7Li,t)17O at two different incident energies. Our result confirms that the contribution of the 1/2+ state is dominant at astrophysical energies. Our reaction rate at T=0.09 GK is slightly lower than the value adopted in the Nuclear Astrophysics Compilation of REaction rates (NACRE), but two times larger than the one obtained in a recent ANC measurement.

Published
2008
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40. GANIL / SPIRAL - 2001-2007 - Achievements, Highlights and Perspectives

Author

Azaiez, F., Beaumel, D., Bertram Blank, Catford, W., Chautard, F., Galès, S., Gaubert, G., Görgen, A., Fortier, S., Lapoux, V., Lemmon, R. C., Nicolas Le Neindre, Lopez, O., Mittig, W., Mueller, P. M., Naviliat-Cuncic, O., Navin, A., Nolan, P. J., Obertelli, A., Francois de Oliveira Santos, Roussel-Chomaz, P., Savajols, H., A Scarpaci, J., Sorlin, O., Thomas, J. C., Walker, P. M., Wieleczko, J. P., Williams, S. J., Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre 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), Department of Physics, University of Surrey (UNIS), 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), Pantechnik, Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), CCLRC, Daresbury Laboratory, 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), National Superconducting Cyclotron Laboratory, Michigan State University [East Lansing], Michigan State University System-Michigan State University System, Physics Division, Argonne National Laboratory, Argonne National Laboratory [Lemont] (ANL), Oliver Lodge Laboratory, University of Liverpool, GANIL, SPIRAL, 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 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), 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
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

Since the early eighties, the intermediate energy ion beams of the GANIL facility and the associated equipments have played a pioneer role in the emergence of new fields in Nuclear Physics based on the production of exotic nuclei in unknown territories of the chart of nuclides.

Published
2008

41. Structure of the N=27 isotones derived from the $^{44}$Ar(d,p)$^{45}$Ar

Author

Gaudefroy, L., Sorlin, O., Nowacki, F., Beaumel, D., Blumenfeld, Y., Dombradi, Z., Fortier, S., Franchoo, S., Grévy, S., Hammache, F., W. Kemper, K., L. Kratz, K., Saint-Laurent, M.G., M. Lukyanov, S., Nalpas, L., N. Ostrowski, A., E. Penionzhkevich, Yu., C. Pollacco, E., Roussel, P., Roussel-Chomaz, P., Sohler, D., Stanoiu, M., Tryggestad, E., Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département de Physique Théorique et Appliquée (DPTA), 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)-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), 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), Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Institute of Nuclear Research (INR), Debrecen, Department of Physics, Florida State University [Tallahassee] (FSU), Max-Planck-Institut für Chemie (MPIC), Max-Planck-Gesellschaft, FLNR-JINR, Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut fûr Kernchemie, Universitât Mainz, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Flerov Laboratory of Nuclear Reactions [Dubna] (FLNR), and Joint Institute for Nuclear Research (JINR)

Subjects
21.10.Jx, 21.60.Cs, 25.60.-t, 27.40.+z, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

Expérience GANIL/SPIRAL, détecteur CATS, détecteur MUST, 7 figures,; International audience; The $^{44}$Ar(d,p)$^{45}$Ar neutron transfer reaction was performed at 10~A.MeV. Measured excitation energies, deduced angular momenta and spectroscopic factors of the states populated in $^{45}$Ar are reported. A satisfactory description of these properties is achieved in the shell model framework using a new $sdpf$ interaction. The model analysis is extended to more exotic even-Z nuclei down to $^{41}_{14}$Si$_{27}$ to study how collectivity impacts the low lying structure of N~=~27 neutron-rich nuclei.

Published
2008
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42. Spontaneous Brillouin scattering modelling and measurement in various axisymetric optical fibres

Author

Lanticq, V., Gabet, R., Auguste, Jean-Louis, Lesoille, S., Fortier, S., Jaouen, Y., PHOTONIQUE, XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), and Lebraud, Sophie

Subjects
ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2007

43. Study of the astrophysical reaction $^{13}$C($\alpha$,n)$^{16}$O by the transfer reaction $^{13}$C($^{7}$Li,t)$^{17}$O

Author

Hammache, F., Pellegriti, M.G., Roussel, Pierre, Audouin, L., Beaumel, D., Fortier, S., Kiener, J., Lefebvre-Schulh, A., Tatischeff, V., Descouvemont, P., Gaudefroy, L., Stanoiu, M., Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), PNTPM, CP 229, Université Libre de Bruxelles, Université libre de Bruxelles (ULB), 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), Helmholtz zentrum für Schwerionenforschung GmbH (GSI), D.T Khoa, P. Egelhof, S. Gales, N. Van Giai, T. Motobayashi, 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
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2007

44. New insight into the low-energy $^{9}$He spectrum

Author

Golovkov, M. S., Grigorenko, L. V., Fomichev, A. S., Gorshkov, A. V., Gorshkov, V. A., Krupko, S. A., Oganessian, Yu. Ts., Rodin, A. M., Sidorchuk, S. I., Slepnev, R. S., Stepantsov, S. V., Ter-Akopian, G. M., Wolski, R., Korsheninnikov, A. A., Nikolskii, E. Yu., Kuzmin, V. A., Novatskii, B. G., Stepanov, D. N., Fortier, S., Roussel-Chomaz, P., Mittig, W., 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), 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
FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

The spectrum of $^9$He was studied by means of the $^8$He($d$,$p$)$^9$He reaction at a lab energy of 25 MeV/n and small center of mass (c.m.) angles. Energy and angular correlations were obtained for the $^9$He decay products by complete kinematical reconstruction. The data do not show narrow states at $\sim $1.3 and $\sim $2.4 MeV reported before for $^9$He. The lowest resonant state of $^9$He is found at about 2 MeV with a width of $\sim $2 MeV and is identified as $1/2^-$. The observed angular correlation pattern is uniquely explained by the interference of the $1/2^-$ resonance with a virtual state $1/2^+$ (limit on the scattering length is obtained as $a > -20$ fm), and with the $5/2^+$ resonance at energy $\geq 4.2$ MeV., 5 pages, 4 figures, 2 tables

Published
2007
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45. Measurement of the B(E2, $0^+_1 \rightarrow 2^+_1$) in the N = 16 nucleus $^{26}$Ne

Author

Gibelin, J., Beaumel, D., Motobayashi, T., Aoi, N., Baba, H., Blumenfeld, Y., Dombradi, Zs., Elekes, Z., Fortier, S., Frascaria, N., Fukuda, N., Gomi, T., Ishikawa, K., Kondo, Y., Kubo, T., Lima, V., Nakamura, T., Saito, A., Satou, Y., Takeshita, E., Takeuchi, S., Teranishi, T., Togano, Y., M. Vinodkumar, A., Yanagisawa, Y., Yoshida, K., 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), Department of Physics [Tokyo], and Rikkyo University [Tokyo]

Subjects
23.20.-g, 25.45.De, 25.70.De, 25.60.-t, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

NESTER; Differential cross section of the inelastic scattering of a 54 MeV/u 26Ne beam on a lead target has been measured by detecting the de-excitation $\gamma$-rays. Analysis of the first 2+ state angular distribution of the inelastically scattered nuclei shows that the process cannot be considered as a pure Coulomb excitation, and nuclear contribution must be taken into account. The charge deformation deduced, ¯C 2 = 0.392 ± 0.024, corresponds to a B(E2) = 141 ± 18 e2fm4 in agreement with a N = 16 sub-shell closure.

Published
2007
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46. Comments on 'Reduction of the Spin-Orbit Splittings at the N=28 Shell Closure'

Author

Gaudefroy, L., Sorlin, O., Beaumel, D., Blumenfeld, Y., Dombrádi, Z., Fortier, S., Franchoo, S., Gélin, M., Gibelin, J., Grévy, S., Hammache, F., Ibrahim, F., W. Kemper, K., Kratz, K.-L., M. Lukyanov, S., Monrozeau, C., Nalpas, L., Nowacki, F., N. Ostrowski, A., Otsuka, T., Penionzhkevich, Yu.-E., Piekarewicz, J., C. Pollacco, E., Roussel-Chomaz, P., Rich, E., A. Scarpaci, J., Saint-Laurent, M.G., Sohler, D., Stanoiu, M., Suzuki, T., Tryggestad, E., Verney, D., Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
25.45.Hi, 21.10.Jx, 21.10.Pc, 27.40.+z, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2007
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47. The (t,$^3$He) reaction at 43 MeV/nucleon on $^{48}$Ca and $^{58}$Ni: Results and microscopic interpretation

Author

Guillot, J., Galès, S., Beaumel, D., Fortier, S., Rich, E., Van Giai, N., Colò, G., M. Van Den Berg, A., Brandenburg, S., Davids, B., N. Harakeh, M., Hunyadi, M., De Huu, M., Y. Van Der Werf, S., J. Wörtche, H., Bäumer, C., Frekers, D., Grewe, E.-W., Haefner, P., C. Junk, B., Fujiwara, M., Institut de Physique Nucléaire d'Orsay (IPNO), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Nuclear Theory, 24.30.Cz, 24.10.Eq, 25.55.Hp, 27.20.+n, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

NESTER PTH; We have used the 43 MeV/nucleon primary tritium beam of the AGOR facility with an intensity of 4×107 pps and the BBS experimental setup to study the (t,3He) reaction between 0° and 5° lab angles on 12C, 48Ca, and 58Ni targets. The standard ray-tracing procedure has allowed us to obtain excitation-energy spectra up to 30 MeV in six angular bins for each residual nucleus, with an average energy resolution of 350 keV. The reaction mechanism has been described in distorted-waves Born approximation (DWBA) using the DWBA98 code. In this approximation, the form factor is treated as a folding of an effective projectile-nucleon interaction with a transition density. The effective projectile-nucleon interaction has been adjusted to reproduce the 0° cross section of the 1+ ground state of 12B populated in the 12C(t,3He) reaction. We have employed random-phase approximation (RPA) wave functions of excited states to construct the form factor instead of the normal modes wave functions used earlier. This new DWBA+RPA analysis is used to compare calculated and experimental cross sections directly and to discuss the giant resonance excitations in 48K and 58Co nuclei.

Published
2006
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48. The (t,He-3) reaction at 43 MeV/nucleon on Ca-48 and Ni-58: Results and microscopic interpretation

Author

Guillot, J., Gales, S., Beaumel, D., Fortier, S., Rich, E., Colo, G., van den Berg, A.M., Brandenburg, S., Davids, B.S., Harakeh, M.N., Hunyadi, M.D., de Huu, M.A., van der Werf, S.Y., Wörtche, H.J., Bäumer, C., Frekers, D., Grewe, E.W., Haefner, P., Junk, B., Fujiwara, M., Research unit Astroparticle Physics, Research unit Nuclear & Hadron Physics, and Damage and Repair in Cancer Development and Cancer Treatment (DARE)

Subjects
ENERGY, EFFECTIVE HE-3-NUCLEON FORCE, AGOR, Nuclear Theory, SCATTERING, CHARGE-EXCHANGE REACTION, Nuclear Experiment, RESONANCES
Abstract

We have used the 43 MeV/nucleon primary tritium beam of the AGOR facility with an intensity of 4x10(7) pps and the BBS experimental setup to study the (t,He-3) reaction between 0 degrees and 5 degrees lab angles on C-12, Ca-48, and Ni-58 targets. The standard ray-tracing procedure has allowed us to obtain excitation-energy spectra up to 30 MeV in six angular bins for each residual nucleus, with an average energy resolution of 350 keV. The reaction mechanism has been described in distorted-waves Born approximation (DWBA) using the DWBA98 code. In this approximation, the form factor is treated as a folding of an effective projectile-nucleon interaction with a transition density. The effective projectile-nucleon interaction has been adjusted to reproduce the 0(degrees) cross section of the 1(+) ground state of B-12 populated in the C-12(t,He-3) reaction. We have employed random-phase approximation (RPA) wave functions of excited states to construct the form factor instead of the normal modes wave functions used earlier. This new DWBA+RPA analysis is used to compare calculated and experimental cross sections directly and to discuss the giant resonance excitations in K-48 and Co-58 nuclei.

Published
2006

49. Investigation of isovector excitations via the (t,He-3) reaction at E-t=43 MeV/u on Ni-58 and Ca-48 targets: microscopic interpretation

Author

Guillot, J, Baumer, C, Beaumel, D, van den Berg, AM, Brandenburg, S, Colo, G, Davids, B, Fortier, S, Frekers, D, Grewe, EW, Fujiwara, N, Gales, S, Haefner, P, Harakeh, MN, Hunyadi, M, de Huu, M, Junk, BC, Rich, E, Van Giai, N, van der Werf, SY, Wortche, HJ, Bäumer, C., Research unit Astroparticle Physics, Research unit Nuclear & Hadron Physics, and Damage and Repair in Cancer Development and Cancer Treatment (DARE)

Published
2005

50. Study of 4-neutron system using the $^{8}$He(D, $^{6}$Li) reaction

Author

Rich, E., Fortier, S., Beaumel, D., Becheva, E., Blumenfeld, Y., Delaunay, F., Frascaria, N., Galès, S., Guillot, J., Hammache, F., Khan, E., Lima, V., Pothet, B., Scarpaci, J.-A., Sorlin, O., Tryggestad, E., Wolski, R., Gillibert, A., Lapoux, V., Nalpas, L., Obertelli, A., Pollacco, E.C., Skaza, F., Roussel-Chomaz, P., Fomichev, A., Stepantsov, S.V., Santonocito, D., Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Yu. E. Penionzhkevich, E.A. Cherepanov, SPIRAL, and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
endocrine system, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], hormones, hormone substitutes, and hormone antagonists
Abstract

NESTER PTH

Published
2004

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