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51. 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
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52. 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
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53. Development of an Anger camera in Lanthanum Bromide for gamma-ray space astronomy in the MeV range

Author: A. T. Astorino, D. Linget, S. Blin, D. C. Bardalez Gagliuffi, N. Karkour, C. Hamadache, V. Tatischeff, J. Kiener, G. Sedes, P. Barrillon, 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), Laboratoire de l'Accélérateur Linéaire (LAL), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Photomultiplier, Scintillation, [PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Photon, [PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], Calorimeter (particle physics), 010308 nuclear & particles physics, business.industry, Physics::Instrumentation and Detectors, [SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Detector, Gamma ray, Scintillator, 01 natural sciences, Anger Camera, [SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], Optics, 0103 physical sciences, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, 010306 general physics, business
Abstract: International audience; Lanthanum bromide is a very promising scintillator material for the next generation of g-ray telescopes. We present in this paper first g-ray imaging results obtained by coupling a LaBr3 crystal with a position-sensitive 8×8 multianode photomultiplier tube to form a simple Anger camera module. The readout of the 64 signals is carried out with the most recent evolution of the MultiAnode ReadOut Chip (MAROC) which was initially designed for the luminometer of the ATLAS detector. Measured charge distributions are compared with detailed GEANT4 simulations that include the tracking of the optical photons produced in the scintillation crystal. The depth of interaction (d.o.i.) of 662-keV g-rays inside the crystal is derived from the charge distributions using an artificial neural network. We obtain for an irradiation at detector centre a mean standard deviation of the d.o.i. of 1.69 mm. Such a position-sensitive g-ray detector can form an innovative building block for a future space calorimeter
Published: 2010

54. 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
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55. New Study of the Astrophysical Reaction [sup 12]C(α,γ)[sup 16]O via the [sup 12]C([sup 7]Li,t)[sup 16]O Transfer Reaction

Author: N. Oulebsir, F. Hammache, M. G. Pellegriti, P. Roussel, L. Audouin, D. Beaumel, A. Bouda, S. Fortier, L. Gaudefroy, J. Kiener, A. Lefebvre, V. Tatischeff, N. Mebarki, and J. Mimouni
Subjects: Nuclear reaction, Physics, Stars, Cross section (physics), chemistry, Nucleosynthesis, chemistry.chemical_element, Atomic physics, 7. Clean energy, Stellar evolution, Helium, Dimensionless quantity, Oxygen-16
Abstract: The 12C(α,γ)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(α,γ)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(α,γ)16O cross section, we performed a new determination of the α ‐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 α ‐reduced widths.
Published: 2010
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56. Gamma-ray burst investigation via polarimetry and spectroscopy (GRIPS)

Author: R. Bellazini, Andreas Zoglauer, M. I. Panasyuk, René Hudec, L. G. Balasz, R. Marcinkowski, V. M. Lipunov, Mark Pearce, Felix Ryde, Andrei M. Bykov, Elena Pian, D. Hartmann, Guido Barbiellini, Andrew W. Strong, A. Majczyna, Zsolt Bagoly, Sandra Savaglio, J. Kiener, István T. Horváth, B. K. Lubsandorgiev, R. V. Poleschuk, Sheila McBreen, Vincent Tatischeff, Karl Mannheim, G. Wrochna, A. M. Chernenko, Martino Marisaldi, G. Bisnovaty-Kogan, A. Pollo, Attila Mészáros, A. F. Iyudin, A. G. Zabrodskij, J. Uvarov, S. Larsson, W. Dröge, S. E. Boggs, A. M. Cherepashuk, Gottfried Kanbach, Andreas von Kienlin, Norbert Langer, S. I. Svertilov, Dmitry Bisikalo, L. M. Zeleny, G. Dicocco, Jochen Greiner, Werner Collmar, Roland Diehl, B. McBreen, Lorraine Hanlon, Claudio Labanti, Cornelia B. Wunderer, Boris Shustov, E. Orlando, Marco Ajello, M. Gierlik, D. A. Varshalovich, Alexei Pozanenko, G. G. Lichti, L. B. Bezrukov, 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), Greiner, J., Iyudin, A., Kanbach, G., Zoglauer, A., Diehl, R., Ryde, F., Hartmann, D., v. Kienlin, A., Mcbreen, S., Ajello, M., Bagoly, Z., Balasz, L. G., Barbiellini, G., Bellazini, R., Bezrukov, L., Bisikalo, D. V., Bisnovaty-Kogan, G., Boggs, S., Bykov, A., Cherepashuk, A. M., Chernenko, A., Collmar, W., Dicocco, G., Droege, W., Gierlik, M., Hanlon, L., Horvath, I., Hudec, R., Kiener, J., Labanti, C., Langer, N., Larsson, S., Lichti, G., Lipunov, V. M., Lubsandorgiev, B. K., Majczyna, A., Mannheim, K., Marcinkowski, R., Marisaldi, M., Mcbreen, B., Meszaros, A., Orlando, E, Panasyuk, M. I., Pearce, M., Pian, E., Poleschuk, R. V., Pollo, A., Pozanenko, A., Savaglio, S., Shustov, B., Strong, A., Svertilov, S., Tatischeff, V., Uvarov, J., Varshalovich, D. A., Wunderer, C. B., Wrochna, G., Zabrodskij, A. G., and Zeleny, L. M.
Subjects: [PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], Astrophysics::High Energy Astrophysical Phenomena, media_common.quotation_subject, education, Early universe, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, Polarimetry, Astrophysics, Compton and pair creation telescope, 7. Clean energy, 01 natural sciences, Primary (astronomy), Nucleosynthesis, Observatory, 0103 physical sciences, Nuclear astrophysics, Hardware_ARITHMETICANDLOGICSTRUCTURES, Spectroscopy, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, health care economics and organizations, ComputingMethodologies_COMPUTERGRAPHICS, media_common, Physics, 010308 nuclear & particles physics, gamma-ray bursts, Astrophysics::Instrumentation and Methods for Astrophysics, nucleosynthesis, Astronomy, Astronomy and Astrophysics, social sciences, early universe, Universe, [SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], 95.55.Ka * 98.70.Rz * 26.30.-k, Space and Planetary Science, Compton and Pair creation telescope, Gamma-ray bursts, Gamma-ray burst
Abstract: The primary scientific goal of the GRIPS mission is to revolutionize our understanding of the early universe using gamma-ray bursts. We propose a new generation gamma-ray observatory capable of unprecedented spectroscopy over a wide range of gamma-ray energies (200 keV-50 MeV) and of polarimetry (200-1000 keV). The gamma-ray sensitivity to nuclear absorption features enables the measurement of column densities as high as 10(28)cm (-aEuro parts per thousand 2). Secondary goals achievable by this mission include direct measurements of all types of supernova interiors through gamma-rays from radioactive decays, nuclear astrophysics with massive stars and novae, and studies of particle acceleration near compact stars, interstellar shocks, and clusters of galaxies.
Published: 2009
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57. Rate of 3H(7Li, n0)9Be and big-bang nucleosynthesis

Author: H. Freiesleben, F.M. Baumann, C. Rolfs, J. P. Thibaud, Alain Coc, G. Bogaert, P. Delbourgo-Salvador, S. Barhoumi, P. Aguer, J. Kiener, and A. Lefebvre
Subjects: Nuclear reaction, Reaction rate, Nuclear physics, Physics, Nuclear and High Energy Physics, Range (particle radiation), Cross section (physics), Big Bang nucleosynthesis, Nucleosynthesis, Atomic physics, Beam (structure)
Abstract: The differential cross sections for the 3H(7Li, n0)9Be reaction were measured at 5 angles in the energy range E(c.m.)=0.2–0.9 MeV using a pulsed 7Li beam and time-of-flight technique. Absolute values of the cross section were obtained by comparison with the well-known cross section of 3H(d, n)4He at Ed=1.0 MeV. The resulting reaction rates are obtained at temperatures relevant to big-bang nucleosynthesis, and consequences for primordial 9Be abundances are discussed.
Published: 1991
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58. Measurements of the Coulomb dissociation cross section of 156 MeVLi6projectiles at extremely low relative fragment energies of astrophysical interest

Author: S. Zagromski, H. J. Gils, H. Jelitto, Gerhard Baur, G. Gsottschneider, J. Wentz, H. Rebel, N. Heide, and J. Kiener
Subjects: Nuclear reaction, Physics, Nuclear and High Energy Physics, Nuclear Theory, Coulomb excitation, Alpha particle, Breakup, Charged particle, Nuclear physics, Fragmentation (mass spectrometry), Electric field, Coulomb, Atomic physics, Nuclear Experiment
Abstract: Coulomb dissociation of light nuclear projectiles in the electric field of heavy target nuclei has been experimentally investigated as an alternative access to radiative capture cross sections at low relative energies of the fragments, which are of astrophysical interest. As a pilot experiment the breakup of 156 MeV {sup 6}Li projectiles at {sup 208}Pb with small emission angles of the {alpha} particle and deuteron fragments has been studied. Both fragments were coincidentally detected in the focal plane of a magnetic spectrograph at several reaction angles well below the grazing angle and with relative angles between the fragments of 0{degree}--2{degree}. The experimental cross sections have been analyzed on the basis of the Coulomb breakup theory. The results for the resonant breakup give evidence for the strong dominance of the Coulomb dissociation mechanism and the absence of nuclear distortions, while the cross section for the nonresonant breakup follows theoretical predictions of the astrophysical {ital S} factor and extrapolations of corresponding radiative capture reaction cross section to very low c.m. energies of the {alpha} particle and deuteron. Various implications of the approach are discussed.
Published: 1991
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59. Indirect study of theC13(α,n)O16reaction via theC13(Li7,t)O17transfer reaction

Author: Pierre Descouvemont, V. Tatischeff, P. Roussel, S. Fortier, D. Beaumel, L. Audouin, M. Vilmay, J. Kiener, M. G. Pellegriti, F. Hammache, L. Gaudefroy, M. Stanoiu, and A. Lefebvre-Schuhl
Subjects: Physics, Nuclear reaction, Oxygen-17, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Neutron emission, Isotopes of lithium, Alpha particle, 01 natural sciences, 7. Clean energy, Reaction rate, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, s-process, Oxygen-16
Abstract: The $^{13}\mathrm{C}$($\ensuremath{\alpha},n$)$^{16}\mathrm{O}$ 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 $^{17}\mathrm{O}$ (${E}_{x}=6.356$ MeV). In this work, we determined the astrophysical $S$ factor through an evaluation of the \ensuremath{\alpha} spectroscopic factor and the corresponding asymptotic normalization factor (ANC) of the 6.356 MeV state using the transfer reaction $^{13}\mathrm{C}$($^{7}\mathrm{Li}$,$t$)$^{17}\mathrm{O}$ 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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60. STUDY OF THE ASTROPHYSICAL REACTION 13C(α,n)16O BY THE TRANSFER REACTION 13C(7Li,t)17O

Author: Pierre Descouvemont, P. Roussel, L. Audouin, S. Fortier, J. Kiener, L. Gaudefroy, A. Lefebvre-Schuhl, M. Stanoui, D. Beaumel, M. G. Pellegriti, F. Hammache, and V. Tatischeff
Subjects: Physics, Transfer (group theory), Physical chemistry, Atomic physics
Published: 2008
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61. Indirect Study of [sup 13]C(α,n)[sup 16]O

Author: F. Hammache, M. G. Pellegriti, P. Roussel, L. Audouin, D. Beaumel, S. Fortier, J. Kiener, A. Lefebvre-Schuhl, V. Tatischeff, P. Descouvemont, L. Gaudefroy, M. Stanoui, Roald Guandalini, Sara Palmerini, and Maurizio Busso
Subjects: Nuclear physics, Reaction rate, Physics, Nucleosynthesis, Asymptotic giant branch, Neutron source, Atomic physics, s-process, Giant star, Resonance (particle physics), Oxygen-16
Abstract: The reaction 13C(α,n)16O is considered as the main neutron source for s‐process in low‐mass asymptotic giant branch stars. At low energies of astrophysical interest, the contribution of the subthreshold state 6.356 MeV of 17O to the 13C(α,n)16O cross section should be taken into account. However, the results of previous studies of this contribution lead to different conclusions.Hence, we investigated the effect of this resonance on the astrophysical S‐factor through a new precise measurement of the alpha spectroscopic factor, Sα, of the 6.356 MeV state using the transfer reaction 13C(7Li,t)17O at two different incident energies. The measured angular distributions and the obtained spectroscopic factors will be presented as well as their impact on C(α,n)16O cross section and reaction rate.
Published: 2008
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62. Quasi-bound low energy tail of resonance

Author: I. Stefan, F. de Oliveira Santos, M. G. Pellegriti, M. Angélique, J. C. Dalouzy, F. de Grancey, M. Fadil, S. Grévy, M. Lenhardt, M. Lewitowicz, A. Navin, L. Perrot, M. G. Saint Laurent, I. Ray, O. Sorlin, C. Stodel, J. C. Thomas, G. Dumitru, A. Buta, R. Borcea, F. Negoita, D. Pantelica, J. C. Angélique, E. Berthoumieux, A. Coc, J. Kiener, A. Lefebvre-Schuhl, V. Tatischeff, J. M. Daugas, O. Roig, T. Davinson, M. Stanoiu, Lídia S. Ferreira, Paramasivan Arumugan, 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), Horia Hulubei National Institute of Physics and Nuclear Engineering (NIPNE), IFIN-HH, 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), 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), 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), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Physics, Mass number, Proton, 010308 nuclear & particles physics, Proton decay, Resonance, Coulomb barrier, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Charged particle, 0103 physical sciences, Atomic physics, 010306 general physics, Ground state, Oxygen-16
Abstract: The ground state of particle‐unbound nuclei is observed as a resonance. According to the Heisenberg's uncertainty principle, the shorter is the lifetime of the state the broader is the resonance. The Breit‐Wigner formalism describes perfectly the shape of the resonance when energy‐dependent partial‐widths are used. In the low energy tail of a ground state resonance near the particle‐emission threshold, the partial‐width for the emission of a charged particle through the Coulomb barrier is drastically reduced. The fact that the proton decay is strongly hindered seems to be equivalent to the assertion that the decay of the proton is strongly delayed. In this interpretation and as an example, possible consequences are discussed in astrophysical context. Two reactions 15O(p,β+)16O and 15O(p,γ)(β+)16O are proposed as new pathways to bypass the 15O waiting point. Cross‐sections were calculated after precise measurements of energies and widths of the proton‐unbound 16F low lying states, obtained using the H(15O,...
Published: 2007
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63. Experimental determination of theO17(p,α)N14andO17(p,γ)F18reaction rates

Author: J. Kiener, S. Barhoumi, A. Lefebvre-Schuhl, N. de Sereville, S. Ouichaoui, Vincent Tatischeff, F. Garrido, Jordi José, Margarita Hernanz, J. P. Thibaud, A. Coc, A. Chafa, and P. Aguer
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Resonance, Atmospheric temperature range, 7. Clean energy, 01 natural sciences, Omega, Reaction rate, Chemical kinetics, Crystallography, 13. Climate action, Nucleosynthesis, 0103 physical sciences, Activation method, 010306 general physics, Energy (signal processing)
Abstract: The {sup 17}O(p,{alpha}){sup 14}N and {sup 17}O(p,{gamma}){sup 18}F reactions are of major importance to hydrogen-burning nucleosynthesis in a number of different stellar sites. In particular, {sup 17}O and {sup 18}F nucleosynthesis in classical novae is strongly dependent on the thermonuclear rates of these two reactions. The previously estimated rate for {sup 17}O(p,{alpha}){sup 14}N carries very large uncertainties in the temperature range of classical novae (T=0.01-0.4 GK), whereas a recent measurement has reduced the uncertainty of the {sup 17}O(p,{gamma}){sup 18}F rate. We report on the observation of a previously undiscovered resonance at E{sub c.m.}=183.3 keV in the {sup 17}O(p,{alpha}){sup 14}N reaction, with a measured resonance strength {omega}{gamma}{sub p{alpha}}=(1.6{+-}0.2)x10{sup -3} eV. We studied in the same experiment the {sup 17}O(p,{gamma}){sup 18}F reaction by an activation method, and the resonance strength was found to amount to {omega}{gamma}{sub p{gamma}}=(2.2{+-}0.4)x10{sup -6} eV. The excitation energy of the corresponding level in {sup 18}F was determined to be 5789.8{+-}0.3 keV in a Doppler shift attenuation method measurement, which yielded a value of {tau}
Published: 2007
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64. Accelerated Particle Properties in Solar Flares from Gamma-Ray Line Observations

Author: M. Gros, V. Tatischeff, G. Weidenspointner, A. Belhout, and J. Kiener
Subjects: Physics, Solar flare, Astrophysics::High Energy Astrophysical Phenomena, Gamma ray, Bremsstrahlung, Electron, law.invention, Nuclear physics, Positron, law, Astrophysics::Solar and Stellar Astrophysics, Gamma spectroscopy, Nuclear Experiment, Flare, Line (formation)
Abstract: In solar flares with strong γ‐ray emission, several prominent narrow lines can usually be observed emerging from a broad structure in the several hundred keV to several MeV region. They are produced by interactions of energetic protons, 3He and α‐particles with the most abundant isotopes in the solar atmosphere. The underlying continuum is due to electron and positron bremsstrahlung and to the superposition of broad lines from accelerated heavy ions as well as numerous narrow nuclear lines which are too weak to be resolved individually. The properties of the accelerated particles in the October 28, 2003 flare observed with the gamma‐ray spectrometer SPI onboard INTEGRAL were deduced by comparison of prominent narrow line fluence ratios, the line shapes of the 4.4 MeV 12C and 6.1 MeV 16O lines and the total nuclear line emission in the framework of a thick target interaction model.
Published: 2007
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65. Measurement and DWBA analysis of the $^{12}C(^6Li, d)^{16}O \alpha$-transfer reaction cross sections at 48.2 MeV. R-matrix analysis of $^{12}C(\alpha,\gamma)^{16}$O direct capture reaction data

Author: A. Boughrara, S.K. Mehdi, J. P. Thibaud, A. Trabelsi, J. Vernotte, J. Kiener, H. Beaumevieille, J.M. Maison, S. Ouichaoui, L. H. Rosier, S. Fortier, A. Belhout, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), 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 reaction, Nuclear and High Energy Physics, 16O, Deduced S-factor, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], E (c.m.), 01 natural sciences, level parameters using DWBA analysis, deduced, 0103 physical sciences, A value, Analysed existing data using R-matrix formalism, E=48.2 MeV, 12C(α, 010306 general physics, R-matrix, Physics, Range (particle radiation), 5 MeV, 010308 nuclear & particles physics, Resolution (electron density), γ)16O, State (functional analysis), Radius, Measured differential cross sections and angular distributions, 25.70.Hi, 24.10.Eq, 27.20.+n, 26.20.+f, Deduced spectroscopic factors, Atomic physics, 12C(6Li, Excitation, d)16O
Abstract: The angular distributions for low lying states of 16O produced in the 12C(6Li, d)16O α-transfer reaction at E Li 6 ( lab ) = 48.2 MeV have been measured using a high energy resolution position sensitive detection system. The measured cross section data have been analyzed by the FRDWBA theory with a particular emphasis put on the states of astrophysical interest mainly the 1 − (7.12 MeV) state. Extracted values of nuclear level parameters (excitation energy, E x , line width, Γ c . m . , α-spectroscopic factor, S α , and reduced α-width, γ α 2 or θ α 2 ) are reported and discussed in comparison to previous ones. The used binding potential corresponds to a long nuclear interaction range (up to a channel radius a = 7.7 fm ), suggesting that the channel radius a = 6.5 fm is likely suitable for the calculations of reduced α-widths near the nuclear surface. However, given that previous DWBA results are available for comparison only near the channel radius a = 5.5 fm , calculations have been carried out here for both three preceding a values. Formal values, 0.0036 ⩽ θ α 2 ( 7.12 ) ⩽ 0.152 and 0.019 ⩽ θ α 2 ( 6.92 ) ⩽ 0.096 of the reduced α-widths ( a = 6.5 fm ) of the 1 − (7.12 MeV) and 2 + (6.92 MeV) states have thus been derived. Furthermore, the R-matrix analysis of various data sets of importance to the 12C( α , γ )16O direct capture reaction has been carried out, leading to the range of values for the 1 − (7.12 MeV) state, 0.0096 ⩽ θ α 2 ( 7.12 ) ⩽ 0.0166 , which is consistent with the preceding DWBA interval, and to a result for the E1 component of the reaction astrophysical factor, S E 1 ( 0.3 ) = 80.6 −16 +17 keV b , very consistent with most constrained values previously reported in the literature.
Published: 2007
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66. New pathway to bypass the $^{15}$O waiting point

Author: I. Stefan, F. de Oliveira Santos, M. G. Pellegriti, M. Angélique, J. C. Dalouzy, F. de Grancey, M. Fadil, S. Grévy, M. Lenhardt, M. Lewitowicz, A. Navin, L. Perrot, M. G. Saint Laurent, I. Ray, O. Sorlin, C. Stodel, J. C. Thomas, G. Dumitru, A. Buta, R. Borcea, F. Negoita, D. Pantelica, J. C. Angélique, E. Berthoumieux, A. Coc, J. Kiener, A. Lefebvre-Schuhl, V. Tatischeff, J. M. Daugas, O. Roig, T. Davinson, M. Stanoiu, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), 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), A. Arnould, M. Lewitowicz, H. Emling, H. Akimune, M. Ohta, H. Utsunomiya, T. Wada, T. Yamagata, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Particle physics, 010308 nuclear & particles physics, Gamma ray, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Resonance (particle physics), Low energy, 0103 physical sciences, Point (geometry), Nuclear Experiment (nucl-ex), 010306 general physics, Ground state, Nuclear Experiment
Abstract: We propose the sequential reaction process $^{15}$O($p$,$\gamma)(\beta^{+}$)$^{16}$O as a new pathway to bypass of the $^{15}$O waiting point. This exotic reaction is found to have a surprisingly high cross section, approximately 10$^{10}$ times higher than the $^{15}$O($p$,$\beta^{+}$)$^{16}$O. These cross sections were calculated after precise measurements of energies and widths of the proton-unbound $^{16}$F low lying states, obtained using the H($^{15}$O,p)$^{15}$O reaction. The large $(p,\gamma)(\beta^{+})$ cross section can be understood to arise from the more efficient feeding of the low energy wing of the ground state resonance by the gamma decay. The implications of the new reaction in novae explosions and X-ray bursts are discussed., Comment: submitted
Published: 2006
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67. New low-energy measurement of the 18F(p,α)15O reaction

Author: Enrique Casarejos, Pierre Descouvemont, P. Mumby-Croft, N. de Sereville, Donald Robertson, Alain Coc, Pierre Leleux, S. P. Fox, Alison Laird, F. Hammache, Vincent Tatischeff, N. L. Achouri, A. Lefebvre, N. A. Orr, Thomas Davinson, J. Kiener, K. Vaughan, Carmen Angulo, P. Figuera, 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), 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), and Institut de Physique Nucléaire d'Orsay (IPNO)
Subjects: Physics, 010308 nuclear & particles physics, Extrapolation, General Physics and Astronomy, Nova (laser), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Interference (wave propagation), 01 natural sciences, Intensity (physics), Nuclear physics, Cross section (physics), 0103 physical sciences, General Materials Science, Satellite, Physical and Theoretical Chemistry, Atomic physics, 010306 general physics, computer, Beam (structure), Leda, computer.programming_language
Abstract: The F-18, produced during nova explosions, is the main responsible for the 511 keV gamma-ray emitted during the outburst that could be detected with satellite missions or future gamma-ray telescopes. In spite of many experimental efforts, the amount of F-18 synthesized still suffers from large uncertainties concerning mainly the F-18(p, alpha)O-15 reaction. We report here on a new direct measurement of the F-18(p, alpha)O-15 cross section recently carried out at the RIB facility at Louvain-la-Neuve. Cross section data down to a center-of-mass energy of 400 keV have been obtained using an isobarically pure F-18 beam ( averaged intensity of the order of 10(6) pps) and a thin polyethylene target. The reaction products were detected using the multi-strip detector array LEDA. The cross section data are analysed in the framework of the R-matrix model. Our main aim is to determine the interference sign between three 3/2(+) resonances above threshold that can significantly affect the extrapolation of the F-18(p, alpha)O-15 cross section to the energies relevant for novae, and thus, the modeling of nova explosions.
Published: 2006
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68. E1andE2Sfactors ofC12(α,γ0)O16fromγ-ray angular distributions with a 4π-detector array

Author: E. Galanopoulos, A. Korichi, J.L. Weil, R. Meunier, A. Coc, D. Malcherek, T. Paradellis, Neil Rowley, C. Boukari-Pelissie, D. Ledu, J.J. Correia, Marlete Assunção, A. Lopez-Martens, J. Kiener, Vincent Tatischeff, C. Grama, R. Kunz, F. Hammache, A. Lefebvre-Schuhl, G. Staudt, F. Haas, F. Hannachi, J. W. Hammer, Suzana Szilner, C. Beck, S. Courtin, Marc Rousseau, J. P. Thibaud, F. Fleurot, M. Fey, and Sotirios Harissopulos
Subjects: Physics, Nuclear and High Energy Physics, Range (particle radiation), 010308 nuclear & particles physics, Scattering, Gamma ray, Carbon-12, Alpha particle, 7. Clean energy, 01 natural sciences, Bismuth germanate, Nuclear physics, chemistry.chemical_compound, chemistry, 0103 physical sciences, Nuclear astrophysics, Atomic physics, 010306 general physics, Ground state
Abstract: A new experiment to determine the thermonuclear cross section of the C-12(alpha,gamma)O-16 reaction has been performed in regular kinematics using an intense alpha-particle beam of up to 340 mu A from the Stuttgart DYNAMITRON. For the first time, a 4 pi-germanium-detector setup has been used to measure the angular distribution of the gamma rays at all angles simultaneously. It consisted of an array of nine EUROGAM high-purity Ge detectors in close geometry, actively shielded individually with bismuth germanate crystals. The C-12 targets were isotopically enriched by magnetic separation during implantation. The depth profiles of the implanted carbon in the C-12 targets were determined by Rutherford backscattering for purposes of cross-section normalization and absolute determination of the E1 and E2 S factors. Angular distributions of the gamma decay to the O-16 ground state were measured in the energy range E-c.m.=1.30-2.78 MeV and in the angular range (lab.) 30 degrees-130 degrees. From these distributions, astrophysical E1 and E2 S-factor functions vs energy were calculated, both of which are indispensable to the modeling of this reaction and the extrapolation toward lower energies. The separation of the E1 and E2 capture channels was done both by taking the phase value phi(12) as a free parameter and by fixing it using the results of elastic alpha-particle scattering on C-12 in the same energy range.
Published: 2006
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69. Erratum: Hydrogen Burning ofO17in Classical Novae [Phys. Rev. Lett.95, 031101 (2005)]

Author: P. Aguer, Margarita Hernanz, J. Kiener, N. de Séréville, Jordi José, S. Barhoumi, A. Chafa, J. P. Thibaud, Vincent Tatischeff, F. Garrido, A. Coc, A. Lefebvre-Schuhl, and S. Ouichaoui
Subjects: Physics, Hydrogen, chemistry, Radiative capture, General Physics and Astronomy, chemistry.chemical_element, Atomic physics
Published: 2006
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70. Experimental Study of 17O(p,α)14N and 17O(p,γ)18F for Classical Nova Nucleosynthesis

Author: S. Barhoumi, N. de Séréville, Vincent Tatischeff, F. Garrido, P. Aguer, Margarita Hernanz, A. Chafa, Jordi José, A. Coc, J. P. Thibaud, J. Kiener, S. Ouichaoui, and A. Lefebvre-Schuhl
Subjects: Nuclear physics, Oxygen-17, Physics, medicine.anatomical_structure, Nucleosynthesis, medicine, Resonance, Alpha particle, Nova (laser), Atomic physics, Activation method, Nucleus, Excitation
Abstract: We investigated the proton‐capture reactions on 17O occuring in classical nova explosions. We observed a previously undiscovered resonance at ERlab=194.1±0.6 keV in the 17O(p,α)14N reaction, with a measured resonance strength ωγpα=1.6±0.2 meV. We studied in the same experiment the 17O(p,γ)18F reaction by an activation method and the resonance‐strength ratio was found to be ωγpα/ωγpγ=470±50. The corresponding excitation energy in the 18F compound nucleus was determined to be 5789.8±0.3 keV by γ‐ray measurements using the 14N(α,γ)18F reaction. These new resonance properties have important consequences for 17O nucleosynthesis and γ‐ray astronomy of classical novae.
Published: 2006
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71. High resolution gamma ray spectroscopy of flares on the east and west limbs of the Sun

Author: Michael J. Harris, Vincent Tatischeff, G. Weidenspointner, M. Gros, J. Kiener, 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), 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), Centre d'étude spatiale des rayonnements (CESR), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD), 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), Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), and Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)
Subjects: Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics, 01 natural sciences, law.invention, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], symbols.namesake, Recoil, law, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, Gamma spectroscopy, 010303 astronomy & astrophysics, Line (formation), Physics, Solar flare, Spectrometer, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], 010308 nuclear & particles physics, Astrophysics (astro-ph), Astronomy and Astrophysics, Magnetic field, Space and Planetary Science, Physics::Space Physics, symbols, Doppler effect, Flare
Abstract: A new generation of Ge-based high-resolution gamma-ray spectrometers has allowed accurate measurements to be made of the profiles, widths and energies of the gamma-ray lines emitted in the impulsive phases of solar flares. Here we present measurements in two flares of the energies of the de-excitation lines of 12C and 16O at 4.4 and 6.1 MeV respectively by the Ge spectrometer SPI on board INTEGRAL, from which Doppler shifts are derived and compared with those expected from the recoil of 12C and 16O nuclei which were excited by the impacts of flare-accelerated ions. An anomalous Doppler measurement (in terms of recoil theory) has been reported by the Ge spectrometer RHESSI in a flare near the east limb, and explained by a tilt of the magnetic field lines at the footpoint of a magnetic loop away from the vertical, and towards the observer. This might be interpreted to imply a significant difference between the Doppler shifts on the east and west limbs, if it is a general phenomenon. SPI observed both east and west limb flares and found no significant difference in Doppler shifts. We also measured the shapes and fluences of these lines, and their fluence ratio to the 2.2 MeV line from the capture of flare-generated neutrons. Analyses of both quantities using thick-target models parametrized by solar physical and geometric quantities suggest that the two flares studied here also have magnetic fields tilted towards the observer, though the significance of the measurements is not high., 9 pp., 7 figs., accepted by A&A
Published: 2006
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72. New study of the astrophysical reaction $^{13}C(\alpha,n)^{16}O$ via the $^{13}C(^{7}Li,t)^{17}O$ transfer reaction

Author: P. Roussel, L. Gaudefroy, A. Lefebvre-Schuhl, M. Vilmay, M. G. Pellegriti, S. Fortier, Vincent Tatischeff, F. Hammache, M. Stanoiu, Didier Beaumel, J. Kiener, and L. Audouin
Subjects: Astrophysics and Astronomy, Chemistry, Physical chemistry, Alpha (ethology)
Published: 2006

73. E1 and E2 S factors of 12C(alpha, gamma)16O from gamma-ray angular distributions with a 4pi-detector array

Author: M. Assunç&atilde, o, M. Fey, A. Lefebvre-Schuhl, J. Kiener, V. Tatischeff, J. W. Hammer, C. Beck, C. Boukari-Pelissie, A. Coc, J. J. Correia, S. Courtin, F. Fleurot, E. Galanopoulos, C. Grama, F. Haas, F. Hammache, F. Hannachi, S. Harissopulos, A. Korichi, R. Kunz, D. LeDu, A. Lopez-Martens, D. Malcherek, R. Meunier, Th. Paradellis, M. Rousseau, N. Rowley, G. Staudt, Szilner, Suzana, and J. P. Thibaud, and J. L. Weil
Subjects: the thermonuclear cross section of the 12C(alpha, gamma)16O reaction, absolute determination of the E1 and E2 S factors
Abstract: A new experiment to determine the thermonuclear cross section of the 12C(alpha, gamma)16O reaction has been performed in regular kinematics using an intense alpha-particle beam of up to 340 &micro ; ; A from the Stuttgart DYNAMITRON. For the first time, a 4pi-germanium-detector setup has been used to measure the angular distribution of the gamma rays at all angles simultaneously. It consisted of an array of nine EUROGAM high-purity Ge detectors in close geometry, actively shielded individually with bismuth germanate crystals. The 12C targets were isotopically enriched by magnetic separation during implantation. The depth profiles of the implanted carbon in the 12C targets were determined by Rutherford backscattering for purposes of cross-section normalization and absolute determination of the E1 and E2 S factors. Angular distributions of the gamma decay to the 16O ground state were measured in the energy range Ec.m.=1.30– 2.78 MeV and in the angular range (lab.) 30°– 130°. From these distributions, astrophysical E1 and E2 S-factor functions vs energy were calculated, both of which are indispensable to the modeling of this reaction and the extrapolation toward lower energies. The separation of the E1 and E2 capture channels was done both by taking the phase value 12 as a free parameter and by fixing it using the results of elastic alpha-particle scattering on 12C in the same energy range.
Published: 2006

74. Comparison of low-energy resonances in15N(α,γ)19F and15O(α,γ)19Ne and related uncertainties

Author: J. Kiener, Peter J. Mohr, G. Rotbard, P. Aguer, G. Staudt, Vincent Tatischeff, V. Kölle, J. Vernotte, J. P. Thibaud, G. Bogaert, F. de Oliveira, S. Wilmes, S. Fortier, A. Coc, A. Lefebvre, L. H. Rosier, and J.M. Maison
Subjects: Physics, Nuclear and High Energy Physics, Theoretical physics, Crystallography, Low energy, 010308 nuclear & particles physics, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, 0103 physical sciences, Resonance, Mirror nuclei, 010306 general physics, 01 natural sciences
Abstract: A disagreement between two determinations of {Gamma}{sub {alpha}} of the astrophysically relevant level at E{sub x}=4.378 MeV in {sup 19}F has been stated in two recent papers by Wilmes {ital et al.} and de Oliveira {ital et al.} In this work the uncertainties of both papers are discussed in detail, and we adopt the value {Gamma}{sub {alpha}} = (1.5{sub {minus}0.8}{sup +1.5}){times}10{sup {minus}9} eV for the 4.378 MeV state. In addition, the validity and the uncertainties of the usual approximations for mirror nuclei {Gamma}{sub {gamma}}({sup 19}F){approx}{Gamma}{sub {gamma}}({sup 19}Ne), {theta}{sub {alpha}}{sup 2}({sup 19}F){approx}{theta}{sub {alpha}}{sup 2}({sup 19}Ne) are discussed, together with the resulting uncertainties on the resonance strengths in {sup 19}Ne and on the {sup 15}O({alpha},{gamma}){sup 19}Ne rate. {copyright} {ital 1997} {ital The American Physical Society}
Published: 1997
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75. Cross section measurements of the Big Bang nucleosynthesis reaction D($\alpha,gamma)^6Li$ by Coulomb dissociation of $^6Li$

Author: P. Koczon, Stefan Typel, A. Walus, F. Schümann, Naohito Iwasa, Kilian Eberhard Schwarz, Andreas Wagner, V. Tatischeff, E. Schwab, J. Kiener, D. Galaviz, F. Attallah, M. Caamaño, O. Sorlin, P. Senger, J. P. Thibaud, Margareta Hellström, A. Coc, Hans Geissel, K. Sümmerer, F. Uhlig, F. Hammache, B. Kohlmeyer, D. Cortina, 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), Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), S.V. Harissopulos, P. Demetriou, and R. Julin
Subjects: Nuclear physics, Physics, Reaction rate, Stars, Big Bang nucleosynthesis, Nucleosynthesis, Coulomb, Halo, Atomic physics, 26.35.+c, 25.55.-e, 97.10.Cv, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Dissociation (chemistry)
Abstract: International audience; The possibility that big-bang nucleosynthesis (BBN) may produce nontrivial amounts of 6Li is under study since the recent observations of this element in old halo stars. However, the interpretation of these observations needs a precise knowledge of the reaction rate of D(alpha, gamma)6Li which, at present, is extremely uncertain (a factor of 20) at the energies of astrophysical interest (Ecm
Published: 2005
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76. Hydrogen Burning ofO17in Classical Novae

Author: A. Chafa, N. de Séréville, Vincent Tatischeff, F. Garrido, A. Lefebvre-Schuhl, P. Aguer, S. Barhoumi, S. Ouichaoui, J. Kiener, A. Coc, Margarita Hernanz, Jordi José, J. P. Thibaud, 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 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), and UCL
Subjects: Hydrogen, nuclear energy level transitions, FOS: Physical sciences, General Physics and Astronomy, Alpha (ethology), chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Astrophysics, proton radiative capture, 7. Clean energy, 01 natural sciences, Omega, alpha particle-nucleus reactions, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Nuclear physics, Nucleosynthesis, proton-nucleus reactions, 0103 physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010303 astronomy & astrophysics, novae, Physics, Oxygen-17, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], 010308 nuclear & particles physics, Astrophysics (astro-ph), nucleosynthesis, Resonance, Alpha particle, 26.30.+k, 25.40.Lw, 25.40.Ny, 27.20.+n, chemistry, Excitation
Abstract: We report on the observation of a previously unknown resonance at E=194.1+/-0.6 keV (lab) in the 17-O(p,alpha)14-N reaction, with a measured resonance strength omega_gamma(p,alpha)=1.6+/-0.2 meV. We studied in the same experiment the 17-O(p,gamma)18-F reaction by an activation method and the resonance-strength ratio was found to be omega_gamma(p,alpha)/omega_gamma(p,gamma)=470+/-50. The corresponding excitation energy in the 18-F compound nucleus was determined to be 5789.8+/-0.3 keV by gamma-ray measurements using the 14-N(alpha,gamma)18-F reaction. These new resonance properties have important consequences for 17-O nucleosynthesis and gamma-ray astronomy of classical novae., 4 pages, 4 figures. Accepted for publication in Physical Review Letters
Published: 2005
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77. Primordial $^{7}$Li abundance and the role of the $^{7}$Be(d,p)2$ALPHA$ reaction

Author: Alain Coc, P. Figuera, F. Vanderbist, N. A. Orr, V. Tatischeff, T. Davinson, N. L. Achouri, E. Casarejos, Carmen Angulo, B.R. Fulton, D. Cortina-Gil, Manoel Couder, P. Leleux, Ivan Mukha, Elisabeth Vangioni, P. Demaret, J. Kiener, A.S. Murphy, 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), 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), S.V. Harissopulos, P. Demetriou, E. Julin, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, primordial abundance, media_common.quotation_subject, Astronomy, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, CMB cold spot, Cosmology, Universe, Abundance of the chemical elements, Galactic halo, Stars, Big Bang nuclosynthesis, Big Bang nucleosynthesis, 13. Climate action, Nucleosynthesis, 26.35.+c,98.80.Ft, Nuclear Experiment, radioactive beam, Astrophysics::Galaxy Astrophysics, media_common
Abstract: International audience; Using the recent very precise value of the baryonic density of the Universe [1] and the rates of the reactions involved in the standard Big Bang nucleosynthesis from a new compilation [2], we have deduced the light element (D, $^{3}$He, $^{4}$He, $^{7}$Li) primordial abundances and compared them with spectroscopic observations [3]. We found an important discrepancy between the deduced $^{7}$Li abundance and the one observed in halo stars of our Galaxy, supposed, until now, to represent the primordial abundance of this isotope. The origin of this discrepancy, observational, nuclear or more fundamental remains to be clarified. Here, we have considered the possible role of the up to now neglected $^{7}$Be(d,p)2$ALPHA$ reaction. We have investigated this reaction for the first time at energies appropriated for the Big-Bang environment using a radioactive $^{7}$Be beam and a (CD2)n self-supporting target at the CYCLONE radioactive beam facility at Louvain-la-Neuve, Belgium [4]. The experimental method is briefly described. Results and consequences for primordial nucleosynthesis are discussed.
Published: 2005
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78. E1 and E2 capture cross section and astrophysical reaction rate of the key reaction $^{12}C$($\alpha$,$\gamma$)$^{16}O$

Author: D. Le Du, M. Rousseau, J Kiener, A Coc, J.L. Weil, E. Galanopoulos, R. Meunier, F. Fleurot, Neil Rowley, E Krmpotic, C. Grama, D. Malcherek, M. Fey, G. Staudt, Tatischeff, C. Beck, J. W. Hammer, A Korichi, R. Kunz, M Assuncao, F Hammache, F Haas, J.J. Correia, Sotirios Harissopulos, S Courtin, Suzana Szilner, A. Lopez-Martens, P. Papka, T. Paradellis, C. Boukari-Pelissie, 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 Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear physics, Reaction rate, Nuclear and High Energy Physics, Cross section (physics), Nucleosynthesis, 0103 physical sciences, Key (cryptography), Alpha (navigation), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 010303 astronomy & astrophysics, 01 natural sciences
Published: 2004
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79. Gamma-ray lines from cosmic-ray interactions with interstellar dust grains

Author: J. Kiener, V. Tatischeff, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, 010504 meteorology & atmospheric sciences, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), Gamma ray, FOS: Physical sciences, Astronomy and Astrophysics, Cosmic ray, Astrophysics, 01 natural sciences, Galaxy, Interstellar medium, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Space and Planetary Science, Excited state, 0103 physical sciences, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, 0105 earth and related environmental sciences, Line (formation), Cosmic dust
Abstract: As pointed out by Lingenfelter and Ramaty (1977), the shapes of some gamma-ray lines produced by cosmic-ray interactions with the interstellar medium potentially contain valuable information on the physical properties of dust grains, including their compositions and size distributions. The most promising of such lines are at 847, 1369, 1779 and 6129 keV, from 56-Fe*, 24-Mg*, 28-Si* and 16-O*, respectively. We performed detailed calculations of their profiles using, in particular, available laboratory measurements combined with optical model calculations to evaluate the energy distributions of the recoiling excited nuclei. We show that the line shapes are mainly sensitive to relatively large interstellar grains, with radii greater than 0.25 microns. Line fluxes from the inner Galaxy are then predicted., 7 pages, 4 figures, to be published in New Astronomy Reviews (proceedings of the Workshop "Astronomy with Radioactivities IV and Filling the Sensitivity Gap in MeV Astronomy", Seeon, Germany, May 26-30, 2003)
Published: 2003
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80. Cross sections relevant toγ-ray line emission in solar flares:3He-induced reactions on16Onuclei

Author: J. Kiener, Vincent Tatischeff, J. A. Scarpaci, F. Hammache, J. P. Thibaud, Ch. Bourgeois, Josette Duprat, Cécile Engrand, M. G. Porquet, A. Coc, Marlete Assunção, Marin Chabot, A. Lefebvre, N. de Sereville, and M. Gounelle
Subjects: Physics, Nuclear and High Energy Physics, Solar flare, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, 01 natural sciences, Nuclear physics, 0103 physical sciences, Electromagnetic shielding, Electronic anticoincidence, Atomic physics, Nuclear Experiment, 010303 astronomy & astrophysics, Excitation, Line (formation)
Abstract: Gamma-ray production cross sections have been measured for gamma-ray lines copiously emitted in the $^3$He bombardment of $^{16}$O nuclei: the 937, 1042 and 1081 keV lines of $^{18}$F and the 1887 keV line of $^{18}$Ne. Four Ge detectors with BGO shielding for Compton suppression were used to measure the angular distributions of the gamma-rays. The excitation functions have been obtained for $^3$He bombarding energies from 3.7 to 36 MeV. Total cross sections are tabulated for calculations relevant to gamma-ray astronomy. The importance of these lines as diagnosis for the presence and properties of accelerated $^3$He in solar flares is discussed in light of the measured cross sections.
Published: 2003
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81. 2H(18F,pα)15Nreaction applied to nova γ-ray emission

Author: Marlete Assunção, N. A. Smirnova, Marc Loiselet, F. de Oliveira Santos, P. Figuera, N. de Sereville, Alain Ninane, J. Kiener, Guido Ryckewaert, Manoel Couder, B. Bouzid, A. Coc, Michel Gaelens, A. Lefebvre, Pierre Leleux, C. Angulo, J. P. Thibaud, P. Demaret, S. Ouichaoui, Daniel Labar, S. Fortier, S. Cherubini, Vincent Tatischeff, F. Hammache, and Didier Beaumel
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, 0103 physical sciences, Astrophysics, Nova (laser), 010306 general physics, 01 natural sciences
Published: 2003
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82. INTEGRAL/SPI ground calibration

Author: J. Kiener, Steven J. Sturner, P. von Ballmoos, V. Schönfelder, Jürgen Knödlseder, S. Crespin, Bonnard J. Teegarden, David Attié, Georg Weidenspointner, Pierre Leleux, Marie-Geneviève Porquet, G. Vedrenne, Bertrand Cordier, V. Tatischeff, Chris Shrader, F. Sanchez, A. von Kienlin, Ph. Paul, C. B. Wunderer, Philippe Laurent, M. Gros, Andrew W. Strong, Jean-Pierre Roques, P. Jean, G. Tauzin, Robert Georgii, S. Joly, Laurent Bouchet, P. Mandrou, G. G. Lichti, Y. André, Gerald K. Skinner, S. Schanne, 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), Centre d'étude spatiale des rayonnements (CESR), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD), 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), INTEGRAL, Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Point source, [SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], FOS: Physical sciences, Instrumentation, Detectors, Spectrographs, Space vehicles, Gamma rays, Observations, Astrophysics, UNESCO::ASTRONOMÍA Y ASTROFÍSICA, 01 natural sciences, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Optics, 0103 physical sciences, Calibration, Source separation, Angular resolution, Spectral resolution, space vehicles: instruments, 010303 astronomy & astrophysics, ASTRONOMÍA Y ASTROFÍSICA::Astronomía óptica [UNESCO], instrumentation: spectrographs, Physics, Spectrometer, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], 010308 nuclear & particles physics, business.industry, instrumentation: detectors, UNESCO::ASTRONOMÍA Y ASTROFÍSICA::Astronomía óptica, Antenna aperture, Astrophysics (astro-ph), Astronomy and Astrophysics, Optical axis, Space and Planetary Science, business, ASTRONOMÍA Y ASTROFÍSICA [UNESCO], gamma rays: observations
Abstract: Three calibration campaigns of the spectrometer SPI have been performed before launch in order to determine the instrument characteristics, such as the effective detection area, the spectral resolution and the angular resolution. Absolute determination of the effective area has been obtained from simulations and measurements. At 1 MeV, the effective area is 65 cm^2 for a point source on the optical axis, the spectral resolution ~2.3 keV. The angular resolution is better than 2.5 deg and the source separation capability about 1 deg. Some temperature dependant parameters will require permanent in-flight calibration., Comment: 9 pages, 12 figures, 2 tables. Accepted for publication in A&AL (INTEGRAL Special issue)
Published: 2003
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83. Calibration of the spectrometer aboard the INTEGRAL satellite

Author: Roland Diehl, Stéphane Schanne, Gerald K. Skinner, David Attié, R. Carli, G. Vedrenne, J. P. Roques, Filomeno Sanchez, M. Gros, Andrew W. Strong, Philippe Laurent, Bonnard J. Teegarden, G. G. Lichti, P. Paul, Bertrand Cordier, Vincent Tatischeff, Chris Shrader, Steven J. Sturner, J. A. Paul, Peter von Ballmoos, P. H. Connell, P. Jean, Cornelia B. Wunderer, L. Bouchet, J. Kiener, V. Schönfelder, Jürgen Knödlseder, Andreas von Kienlin, G. Weidenspointner, P. Mandrou, 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 de recherche en astrophysique et planétologie (IRAP), Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Photon, Spectrometer, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], 010308 nuclear & particles physics, media_common.quotation_subject, Astrophysics (astro-ph), Detector, FOS: Physical sciences, Field of view, Astrophysics, 7. Clean energy, 01 natural sciences, On board, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], 13. Climate action, Sky, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Spectral resolution, 010303 astronomy & astrophysics, Mutual influence, Remote sensing, media_common
Abstract: SPI, the Spectrometer on board the ESA INTEGRAL satellite, to be launched in October 2002, will study the gamma-ray sky in the 20 keV to 8 MeV energy band with a spectral resolution of 2 keV for photons of 1 MeV, thanks to its 19 germanium detectors spanning an active area of 500 cm2. A coded mask imaging technique provides a 2 deg angular resolution. The 16 deg field of view is defined by an active BGO veto shield, furthermore used for background rejection. In April 2001 the flight model of SPI underwent a one-month calibration campaign at CEA in Bruy\`eres le Ch\^atel using low intensity radioactive sources and the CEA accelerator for homogeneity measurements and high intensity radioactive sources for imaging performance measurements. After integration of all scientific payloads (the spectrometer SPI, the imager IBIS and the monitors JEM-X and OMC) on the INTEGRAL satellite, a cross-calibration campaign has been performed at the ESA center in Noordwijk. A set of sources has been placed in the field of view of the different instruments in order to compare their performances and determine their mutual influence. Some of those sources had already been used in Bruy\`eres during the SPI standalone test. For the lowest energy band calibration an X-ray generator has been used. We report on the scientific goals of this calibration activity, and present the measurements performed as well as some preliminary results., Comment: 12 pages, 19 figures, Published in Proceedings of SPIE conference, 24-28 August 2002, Waikoloa, Hawaii, USA
Published: 2002

84. Study of the $^{18}$F(p,$\alpha$)$^{15}$O reaction for application to nova $\gamma$-ray emission

Author: C. Angulo, Daniel Labar, Michel Gaelens, J. Kiener, N. de Sereville, Alain Ninane, N. A. Smirnova, J. P. Thibaud, F. Hammache, P. Demaret, Marc Loiselet, A. Coc, Didier Beaumel, A. Lefebvre, Manoel Couder, S. Ouichaoui, F. de Oliveira Santos, P. Figuera, Guido Ryckewaert, Marlete Assunção, B. Bouzid, S. Cherubini, S. Fortier, Pierre Leleux, Vincent Tatischeff, 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), Institut de Physique Nucléaire d'Orsay (IPNO), 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), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Astrophysics (astro-ph), Gamma ray, Alpha (ethology), Resonance, FOS: Physical sciences, Astrophysics, Nova (laser), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Reaction rate, Louvain la neuve, 0103 physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010303 astronomy & astrophysics
Abstract: The ^18F(p, alpha)^15O reaction is recognized as one of the most important reaction for nova gamma-ray astronomy as it governs the early =< 511 keV emission. However, its rate remains largely uncertain at nova temperatures due to unknown low-energy resonance strengths. In order to better constrain this reaction rate, we have studied the one-nucleon transfer reaction, D(^18F,p alpha)^15N, at the CRC-RIB facility at Louvain La Neuve., Contribution to The Seventh International Symposium on Nuclei in the Cosmos
Published: 2002

85. N2868i40: Magicity versus Superfluidity

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

Author: C. Borcea, Z. Dlouhy, M. Belleguic, A. Astier, M. G. Saint-Laurent, E. Dragulescu, O. Sorlin, Oleg B. Tarasov, S. Grévy, C. Donzaud, S. Leenhardt, Zs. Dombrádi, F. Pougheon, P. Mayet, D. Baiborodin, F. Azaiez, J. A. Scarpaci, F. Amorini, Roy Crawford Lemmon, G. Sletten, M. Lewitowicz, S. M. Lukyanov, Ch. Bourgeois, L. Petizon, D. Pantalica, J. Kiener, D. Guillemaud-Mueller, G.B. Hagemann, Ch. Theisen, I. Deloncle, D. M. Cullen, M. Stanoiu, M. G. Porquet, Yu. E. Penionzhkevich, F. de Oliveira Santos, N. Redon, K. Bienczak, H. Brenning, H. Grawe, B. Herskind, M. Górska, and Josette Duprat
Subjects: Nuclear physics, Physics, Isotope, Closure (topology), Coulomb excitation, Atomic physics
Published: 2002
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87. A new experiment for the determination of the 18F(p,α) reaction rate at nova temperatures

Author: N. A. Smirnova, S. Fortier, J. P. Thibaud, P. Demaret, S. Cherubini, Daniel Labar, F. Hammache, Alain Ninane, B. Bouzid, A. Coc, Pierre Leleux, Vincent Tatischeff, P. Figuera, N. de Sereville, A. Lefebvre, S. Ouichaoui, Manoel Couder, J. Kiener, Marlete Assunção, Marc Loiselet, Michel Gaelens, F. de Oliveira Santos, Guido Ryckewaert, Didier Beaumel, C. Angulo, 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), Institut de Physique Nucléaire d'Orsay (IPNO), 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), Lorgeril, Jocelyne, and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Physics, Range (particle radiation), [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], Astrophysics (astro-ph), FOS: Physical sciences, 020206 networking & telecommunications, 02 engineering and technology, Gamma-ray astronomy, Nova (laser), Alpha (navigation), [SDU.ASTR] Sciences of the Universe [physics]/Astrophysics [astro-ph], Astrophysics, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Reaction rate, Nuclear physics, Low energy, [PHYS.ASTR.CO] Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Louvain la neuve, 0202 electrical engineering, electronic engineering, information engineering, 020201 artificial intelligence & image processing, Nuclear Experiment (nucl-ex), Nuclear Experiment, Beam (structure)
Abstract: The 18F(p,alpha) reaction was recognized as one of the most important for gamma ray astronomy in novae as it governs the early 511 keV emission. However, its rate remains largely uncertain at nova temperatures. A direct measurement of the cross section over the full range of nova energies is impossible because of its vanishing value at low energy and of the short 18F lifetime. Therefore, in order to better constrain this reaction rate, we have performed an indirect experiment taking advantage of the availability of a high purity and intense radioactive 18F beam at the Louvain La Neuve RIB facility. We present here the first results of the data analysis and discuss the consequences., Contribution to the Classical Novae Explosions conference, Sitges, Spain, 20-24 May 2002, 5 pages, 3 figures
Published: 2002
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88. THE SOLAR NEUTRINO PROBLEM: LOW ENERGY MEASUREMENTS OF THE 7Be(p,γ)8B CROSS SECTION

Author: L. Brillard, J.F. Chemin, C. Le Naour, J. Kiener, C. Angulo, A. Coc, J. N. Scheurer, G. Bogaert, A. Lefebvre, M. Jacotin, Vincent Tatischeff, P. Aguer, G. Claverie, J. P. Thibaud, S. Barhoumi, E. Virassamynaiken, M. Hussonois, S. Ouichaoui, and F. Hammache
Subjects: Physics, Nuclear physics, Cross section (physics), Low energy, Solar neutrino problem
Published: 2001
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89. Applications of Coulomb Breakup to Nuclear Astrophysics

Author: J. Kiener
Subjects: Physics::Fluid Dynamics, Physics, Nuclear physics, Thermonuclear fusion, Nuclear Theory, Radiative capture, Coulomb, Nuclear astrophysics, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Nuclear Experiment, Breakup, Interference (wave propagation)
Abstract: The method of Coulomb breakup, applied to the determination of radiative capture cross sections at thermonuclear energies will be briefly introduced. In the following I will concentrate on the experimental requirements for a determination of the astrophysical S-factor using the Coulomb breakup reaction at intermediate energies for 6 Li and 16 O breakup. Interference of E1 and E2 contributions and of Coulomb and nuclear induced breakup are discussed and illustrated. Finally, some prospects concerning the future of Coulomb breakup studies are given.
Published: 2001
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90. (68)(28)Ni(40): Magicity versus superfluidity

Author: O, Sorlin, S, Leenhardt, C, Donzaud, J, Duprat, F, Azaiez, F, Nowacki, H, Grawe, Zs, Dombrádi, F, Amorini, A, Astier, D, Baiborodin, M, Belleguic, C, Borcea, C, Bourgeois, D M, Cullen, Z, Dlouhy, E, Dragulescu, M, Górska, S, Grévy, D, Guillemaud-Mueller, G, Hagemann, B, Herskind, J, Kiener, R, Lemmon, M, Lewitowicz, S M, Lukyanov, P, Mayet, F, de Oliveira Santos, D, Pantalica, Yu-E, Penionzhkevich, F, Pougheon, A, Poves, N, Redon, M G, Saint-Laurent, J A, Scarpaci, G, Sletten, M, Stanoiu, O, Tarasov, and Ch, Theisen
Abstract: The neutron-rich (66,68)Ni have been produced at GANIL via interactions of a 65.9A MeV 70Zn beam with a 58Ni target. Their reduced transition probability B(E2;0(+)(1)--2+) has been measured for the first time by Coulomb excitation in a (208)Pb target at intermediate energy. The B(E2) value for (68)Ni(40) is unexpectedly small. An analysis in terms of large scale shell model calculations stresses the importance of proton core excitations to reproduce the B(E2) values and indicates the erosion of the N = 40 harmonic-oscillator subshell by neutron-pair scattering.
Published: 2000

91. Low-energy measurement of the 7Be(p,gamma)8B cross section

Author: F, Hammache, G, Bogaert, P, Aguer, C, Angulo, S, Barhoumi, L, Brillard, J F, Chemin, G, Claverie, A, Coc, M, Hussonnois, M, Jacotin, J, Kiener, A, Lefebvre, C, Le Naour, S, Ouichaoui, J N, Scheurer, V, Tatischeff, J P, Thibaud, and E, Virassamynaïken
Abstract: We have measured the cross section of the 7Be(p,gamma)8B reaction for E(c.m.) = 185.8, 134.7, and 111.7 keV using a radioactive 7Be target (132 mCi). Single and coincidence spectra of beta+ and alpha particles from 8B and 8Be* decay, respectively, were measured using a large acceptance spectrometer. The zero energy S factor inferred from these data is 18.5+/-2.4 eV b and a weighted mean value of 18.8+/-1.7 eV b (theoretical uncertainty included) is deduced when combining this value with our previous results at higher energies.
Published: 2000

92. First direct proof of internal conversion between bound states

Author: T. Carreyre, G. Bogaert, J. P. Grandin, M. Aiche, W. E. Meyerhof, John Durell, A. Lefebvre, M. R. Harston, F. Attallah, J. N. Scheurer, J.F. Chemin, J.P. Goudour, J. Kiener, G. Claverie, F. Bourgine, W.R. Phillips, 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), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Physics, Nuclear and High Energy Physics, Internal conversion, 010308 nuclear & particles physics, 0103 physical sciences, Bound state, Direct proof, Atomic physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences
Published: 2000

93. In-beam gamma spectroscopy of very neutron-rich nuclei at GANIL

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

94. Subshell closure study at N=40 by Coulomb excitation and $\beta$-decay

Author: C. Donzaud, G. Canchel, Yu-E. Penionzhkevich, J. M. Daugas, F. Pougheon, C. Borcea, A. Gillibert, J. S. Winfield, M. G. Saint-Laurent, A. Emsalem, M. Belleguic, S. Leenhardt, R. Béraud, C. Longour, J. C. Angélique, D. Guillemaud-Mueller, F. Azaiez, A.C. Mueller, J. Kiener, Josette Duprat, Eric Chabanat, M. G. Porquet, I. Deloncle, J. E. Sauvestre, F. Marie, Yu. Sobolev, S. Grévy, C. Bourgeois, M. Lewitowicz, O. Sorlin, F. de Oliveira, N. A. Orr, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Frois B.
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, 0103 physical sciences, Closure (topology), Coulomb excitation, Atomic physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences, ComputingMilieux_MISCELLANEOUS
Abstract: NESTER; International audience
Published: 1998
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95. In-beam gamma spectroscopy of very neutron-rich nuclei at GANIL

Author: F. Pougheon, A. Gillibert, J. C. Angélique, F. Azaiez, S. Leenhardt, M. J. Lopez, Z. Dlouhy, M. Stanoiu, M. Belleguic, M. G. Porquet, W. Shuying, M. G. Saint-Laurent, N. L. Achouri, M. Lewitowicz, S. Grévy, C. Donzaud, J. Kiener, H. Savajols, N. A. Orr, Yu-E. Penionzhkevich, O. Sorlin, J. M. Daugas, C. Borcea, F. Marie, Yu. G. Sobolev, Josette Duprat, P. Roussel-Chomaz, I. Deloncle, D. Guillemaud-Mueller, A.C. Mueller, J. E. Sauvestre, W. Mittig, F. de Oliveira, Ch. Bourgeois, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Baktash C., Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Isotope, 010308 nuclear & particles physics, Gamma ray, Coulomb excitation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, Excited state, 0103 physical sciences, Neutron, Gamma spectroscopy, 010306 general physics, Ground state, Nuclear Experiment, Beam (structure)
Abstract: International audience; The structure of nuclei far from stability call be investigated by means of in-beam gamma spectroscopy using both stable and radioactive beams. A gamma -array consisting of BaF2 and Ge detectors have been used at GANIL in order to perform two of such experiments: i) Secondary beams of neutron-rich Ge, Zn and Ni isotopes around N=40 were produced from the fragmentation of a primary /sup 86/Kr beam, and analyzed by means of the LISE3 spectrometer. For the transitions between the 0/sup +/ ground state and the first 2/sup +/ state, B(E2) values have been extracted from Coulomb excitation cross-section measurement. Some of the obtained results related to the effectiveness of the N=40 spherical sub-shell closure as well as future improvements of the quality of the data are discussed. ii) In-beam gamma -spectroscopy of neutron-rich nuclei around /sup 32/Mg produced by fragmentation of /sup 36/S have been recently performed Gamma decay of relatively higher excited states have been measured in a large number of exotic light nuclei. Preliminary results obtained in a number of even-even nuclei around N=20, such as /sup 20,22/O, /sup 26,28/Ne and /sup 30,32/Mg are presented.
Published: 1998
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96. STUDY OP THE 12C(α, γ)16O REACTION BY BREAKUP OF A 16O -BEAM AT 100 MeV/A

Author: J. P. Thibaud, L. Kraus, Fabiola Reis Oliveira, C. Angulo-Perez, A. Coc, V. Tatischeff, J. Kiener, D. Disdier, G. Bogaert, I. Linck, C. Stephan, P. Aguer, W. Mittig, P. Roussel-Chomaz, Tohru Motobayashi, T. Ichihara, and A. Lefebvre
Subjects: Materials science, Atomic physics, Breakup, Beam (structure)
Published: 1995
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97. Astrophysical rate of the $^{11}$C+p reaction from the coulomb break-up of a $^{12}$N radioactive beam

Author: J. P. Thibaud, L. Kraus, P. Roussel-Chomaz, I. Linck, L. Tassan-Got, F. Guilbault, G. Bogaert, P. Aguer, Christoph A. Stephan, J.A. Scarpaci, J. Kiener, F. de Oliveira, A. Coc, Ph. Eudes, F. Attallah, D. Disdier, C. Grunberg, A. Lefebvre, S. Fortier, Th. Reposeur, 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), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-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), and 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)
Subjects: Proton–proton chain reaction, Physics, Nuclear reaction, Nuclear and High Energy Physics, Break-Up, 010308 nuclear & particles physics, 01 natural sciences, Nuclear physics, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Fragmentation (mass spectrometry), Excited state, 0103 physical sciences, Coulomb, Radiative transfer, Atomic physics, 010306 general physics, Radioactive beam
Abstract: The Coulomb break-up technique has been used to determine the radiative width of one excited level in 12 N and the direct capture contribution to 11 C(p,γ) 12 N. The 12 N radioactive beam was produced through transfer and fragmentation reactions of a primary 95.5 MeV/u 14 N beam at GANIL. From the extracted cross section we deduce the rate of the 11 C+p reaction. Consequences for the hot pp chain are analysed.
Published: 1995
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98. Determination of alpha widths in $^{19}$F

Author: S. Fortier, J.M. Maison, F. de Oliveira, G. Rotbard, P. Aguer, Vincent Tatischeff, J. P. Thibaud, J. Vernotte, J. Kiener, C. Angulo, G. Bogaert, A. Coc, A. Lefebvre, L. H. Rosier, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), 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: Alpha (ethology), chemistry.chemical_element, 020206 networking & telecommunications, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Finite range, 7. Clean energy, Resonance (particle physics), Cross section (physics), chemistry, Nucleosynthesis, 0202 electrical engineering, electronic engineering, information engineering, Fluorine, 020201 artificial intelligence & image processing, Atomic physics
Abstract: The reaction 15Na(α,γ)19F is of great importance for fluorine nucleosynthesis. At temperatures where 19F is expected to be produced, the narrow resonance associated with the 4.377 MeV level of 19F yields the dominant contribution to cross section. We have extracted its width by using the alpha‐transfer reaction 15N(7Li,t)19F and finite range DWBA analysis.
Published: 1994

99. Stripping properties of a plasma medium for MeV/u chlorine ions

Author: Claude Deutsch, M. Nectoux, D. Gardès, K. Wohrer, D. Hong, C. Fleurier, Gilles Maynard, V. Andre, J. Kiener, Marin Chabot, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), 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 Lorgeril, Jocelyne
Subjects: Nuclear and High Energy Physics, Materials science, Hydrogen, Stripping (chemistry), Electron capture, Analytical chemistry, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, 010305 fluids & plasmas, Ion, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Physics::Plasma Physics, 0103 physical sciences, Chlorine, 010306 general physics, Instrumentation, Astrophysics::Galaxy Astrophysics, Charge density, Charge (physics), Plasma, Accelerators and Storage Rings, chemistry, [PHYS.ASTR.CO] Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Physics::Space Physics, Electric discharge, Atomic physics, Beam (structure)
Abstract: Clear experimental evidence of plasma stripping enhancement for 1.5 MeV/u chlorine ions is contrasted with its cold gas homologue at the same density (1{times}10{sup 19} {ital e}{sup {minus}}/cm{sup {minus}2}). The plasma is created by an electrical discharge in hydrogen and diagnosed with optical spectroscopic methods and beam probe analysis. The velocity dependence for the charge distributions is modeled both in cold gas and in plasma experiments. The calculations are found to be in good agreement with the hypothesis of a strongly reduced capture rate in the plasma case. Those results document quantitatively the basic mechanisms underlying the enhanced ion projectile charge in a plasma target. They also add credence to currently advocated scenarios for heavy-ion-driven fusion.
Published: 1994

100. Charge evolution of swift heavy ions in fusion plasmas

Author: Gilles Maynard, W. André, M. Pouey, D. Gardès, Claude Deutsch, M. Chabot, K. Wohrer, C. Fleurier, D. Hong, J. Kiener, 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: Swift, Physics, Range (particle radiation), Hydrogen, Fusion plasma, chemistry.chemical_element, Charge (physics), Plasma, 01 natural sciences, 7. Clean energy, 010305 fluids & plasmas, Ion, chemistry, 0103 physical sciences, Atomic number, Atomic physics, 010306 general physics, computer, computer.programming_language
Abstract: Influence of target temperature, density and atomic number on the charge state of swift heavy ions interacting with hot and dense plasma is considered. Hydrogen targets exhibit strong temperature effects and large non-equilibrium charges, whereas interactions with heavy material are more sensitive to the density effect. Our new average correlated hydrogenic atom model (ACHAM) is presented. It enables us to cover the whole range of target densities of interest for swift heavyion-plasma interaction experiments.
Published: 1993

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