M. Ducourtieux

Publications (24)10.8 Total impact

• Article: Study of the N = 50 major shell effect close to 78Ni : First evidence of a weak coupling structure in 8332Ge51and three-proton configuration states in 8131Ga50

  D Verney, F Ibrahim, O Perru, O Bajeat, C Bourgeois, M Ducourtieux, C Donzaud, S Essabaa, S Galès, L Gaudefroy, D Guillemaud-Mueller, F Hammache, C Lau, H Lefort, F Le Blanc, A C Mueller, F Pougheon, B Roussière, J Sauvage, O Sorlin
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  ABSTRACT: New levels were attributed to 8131Ga50 and 8332Ge51 which were fed by the β-decay of their respective mother nuclei 8130Zn51 and 8331Ga52 produced by fission at the "PARRNe" ISOL set-up installed at the Tandem accelerator of the Institut de Physique NucléLeaire, Orsay. We show that the low energy structure of 8131Ga50 and 8332Ge51 can easily be explained within the natural hypothesis of a strong energy gap at N = 50 and a doubly-magic character for 78Ni.
  Journal of Physics Conference Series 11/2006; 49(1):170.
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  Available from: A.C. Mueller

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

  D. Verney, F. Ibrahim, O. Perru, O. Bajeat, C. Bourgeois, M. Ducourtieux, C. Donzaud, S. Essabaa, S. Gales, L. Gaudefroy, D. Guillemaud-Mueller, F. Hammache, C. Lau, H. Lefort, F. Le Blanc, A.C. Mueller, F. Pougheon, B. Roussiere, J. Sauvage, O. Sorlin
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  ABSTRACT: New levels were attributed to $^{81}\_{31}$Ga$\_{50}$ and $^{83}\_{32}$Ge$\_{51}$ which were fed by the $\beta$-decay of their respective mother nuclei $^{81}\_{30}$Zn$\_{51}$ and $^{83}\_{31}$Ga$\_{52}$ produced by fission at the "PARRNe" ISOL set-up installed at the Tandem accelerator of the Institut de Physique Nucl\'eaire, Orsay. We show that the low energy structure of $^{81}\_{31}$Ga$\_{50}$ and $^{83}\_{32}$Ge$\_{51}$ can easily be explained within the natural hypothesis of a strong energy gap at N=50 and a doubly-magic character for $^{78}$Ni.
  11/2006;
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  Available from: Lucian Stroe

  Article: Yields of neutron-rich rubidium and cesium isotopes from fast-neutron induced fission of U-238, obtained by studying their release from a thick ISOL target

  F Hosni, C Lau, O Bajeat, R Borcea, C Bourgeois, C Donzaud, M Ducourtieux, S Essabaa, D Guillemaud-Mueller, F Ibrahim, [......], B Pfeiffer, U Koster, A Joinet, J Lettry, K Perajarvi, L Tecchio, G Lhersonneau, E Fioretto, G Prete, L Stroe
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  ABSTRACT: In the framework of the EURISOL project, the production of neutron-rich isotopes of rubidium and cesium has been studied. The intensities of mass-separated beams of rubidium and cesium isotopes generated from a thick (UCx)-U-238 target connected to a surface ionizer have been measured. The release properties of Cs-140 and Rb-91 have been investigated. The obtained results allowed us to determine the relative fission yields of rubidium and cesium isotopes with high accuracy. (c) 2006 Elsevier B.V. All rights reserved.
  Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms 06/2006; 247(2):205-209. · 1.21 Impact Factor
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  Available from: A.C. Mueller

  Article: Study of the N = 50 major shell effect toward 78Ni at PARRNe⋆

  O. Perru, D. Verney, F. Ibrahim, O. Bajeat, C. Bourgeois, F. Clapier, E. Cottereau, C. Donzaud, S. Du, M. Ducourtieux, [......], F. Le Blanc, A. C. Mueller, J. Obert, N. Pauwels, J. C. Potier, F. Pougheon, J. Proust, B. Roussière, J. Sauvage, O. Sorlin
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  ABSTRACT: The γ-ray de-excitations following the β-decay of 83Ga and the β-n decay of 84Ga have been studied. The radioactive species were produced using the PARRNe on-line mass-separator installed at the IPN Orsay Tandem accelerator. Two γ-lines were attributed to 83Ge with the aid of β-γ and γ-γ coincidences. The Z identification of the γ-lines was provided by time analysis of a buid-up/decay cycle. The excited levels of 83Ge can be explained by the coupling of the single neutron state ν2d 5/2 to the first 2+ excitation of the 82Ge core.
  European Physical Journal A 05/2006; 28(3):307-312. · 2.19 Impact Factor
• Article: Development of a plasma ion source for next-generation facilities

  M. Cheikh Mhamed, C. Lau, S. Essabaa, J. Arianer, O. Bajeat, H. Croizet, M. Ducourtieux, H. Lefort
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  ABSTRACT: The ionization by radial electron neat adaptation (IRENA) ion source has been designed to operate under unprecedented radiation conditions generated by next-generation facilities such as SPIRAL-2 and EURISOL. The design and development of this next-generation-facility ion source will be presented and discussed.
  Review of Scientific Instruments 04/2006; · 1.37 Impact Factor
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  Available from: D. Guillemaud-Mueller

  Article: Production of mass-separated fission fragment beams at ALTO

  M Lebois, M Cheikh Mhamed, J M Curaudeau, M Ducourtieux, S Essabaa, S Franchoo, S Gaì, D Guillemaud-Mueller, F Ibrahim, C Lau, J Lesrel, A Mueller, M Raynaud, B Roussì, A Said, D Verney, C Vogel
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  ABSTRACT: Yields of neutron-rich isotopes produced by the photofission were measured at the ISOL ALTO facility. The identification was achieved by a combined measurement of β and γ-rays. Production rates for Xe, Kr, Sn, In and I isotopes are presented here. In parallel, empirical estimations for the yields based on the PARRNe experimental data and the results provided by a very recent FLUKA simulation are presented.
  01/2006; 22(11).
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  Available from: D. Guillemaud-Mueller

  Article: Fission yield measurements with the ISOL method

  U. Koester, G. Auboeck, U. C. Bergmann, R Catherall, J. Cederkaell, I.M. Fraile, S. Franchoo, H. Fynbo, U Georg, A. Joinet, [......], G. Lhersonneau, G. Prete, L. Stroe, L. Tecchio, C.A.A. Diget, H. Jeppersen, K. Riisager, H. Gausemel, E Hagebo, D. Ridikas
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  ABSTRACT: Radioactive ion beam intensities have been measured at ISOL (isotope separation on-line) facilities from many different targets, but only rarely these intensities are converted into production cross-sections. Here we discuss the method and possible problems in this conversion at the examples of Kr and Xe produced by 1.4 GeV-proton-induced fission of 238U at ISOLDE and Rb and Cs produced by ~10 MeV-neutron-induced fission of 238U at PARRNe.
  11/2003;
• Article: neutron-richsurfon-richD2p

  C. Lau, F. Hosni, O. Perru, O. Bajeat, R. Borcea, C. Donzaud, M. Ducourtieux, S. Essabaa, D. Guillemaud-Mueller, F. Ibrahim, J. Obert, E. Fioretto, G. Lhersonneau, G. Prete, L. Stroe, L. Tecchio, A. Joinet, J Lettry
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  ABSTRACT: Yieldsof neutron-rich isotopes produced byfDfi neutron induced U were measured at the ISOL set-up Production d#AtomesRadioactif Riches en Neutrons.
  06/2003;
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  Available from: Lucian Stroe

  Article: Production of neutron-rich surface-ionized nuclides at PARRNe

  C. Lau, F. Hosni, O. Perru, O. Bajeat, R. Borcea, Ch. Bourgeois, C. Donzaud, M. Ducourtieux, S. Essabaa, D. Guillemaud-Mueller, [......], E. Fioretto, G. Lhersonneau, G. Prete, L. Stroe, L. Tecchio, B. Pfeiffer, A. Joinet, U. Koster, J. Lettry, K. Perajarvi
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  ABSTRACT: Yields of neutron-rich isotopes produced by fast neutron induced fission of U-238 were measured at the ISOL set-up Production d'Atomes Radioactifs Riches en Neutrons. A surface ion source was used to ionize selectively elements with low ionization potentials. In order to observe also the most n-rich isotopes, the identification was achieved by a combined measurement of beta- and gamma-rays and beta-delayed neutrons. The flux of fast neutrons inducing fission was generated by a 1 muA beam of 26 MeV deuterons stopped in a graphite converter. The target was a standard ISOLDE type (UCX)-U-238/graphite (50. g/cm(2)) heated by a tantalum oven to about 2050 degrees C. A large variety of radioactive isotopes could be determined quantitatively. Production rates measured for Rb and Cs isotopes are presented here.
  Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms 05/2003; 204:257-260. · 1.21 Impact Factor
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  Available from: A.C. Mueller

  Article: Photofission for the production of radioactive beams: Experimental data from an on-line measurement

  F. Ibrahim, J. Obert, O. Bajeat, J.M. Buhour, D. Carminati, F. Clapier, C. Donzaud, M. Ducourtieux, J.M. Dufour, S. Essabaa, [......], J. Proust, F. Pougheon, H. Ravn, L. Rinolfi, G. Rossat, H. Safa, M.G. Saint Laurent, M. Santana-Leitner, O. Sorlin, D. Verney
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  ABSTRACT: A PARRNe 1 experiment (Production d'Atomes Radioactifs Riches en Neutrons) aimed at the production of neutron-rich radioactive noble gases produced by photofission has been performed at CERN. The LEP Pre-Injector (LPI) has been used to deliver a 50 MeV electron beam. The results obtained show clearly that the use of an electron beam to produce neutron-rich fission fragments for futur RNB facilities is an option that should not be neglected.
  European Physical Journal A 10/2002; 15(3):357-360. · 2.19 Impact Factor
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  Available from: cdsweb.cern.ch

  Article: COMPLIS experiments: COllaboration for spectroscopy Measurements using a Pulsed Laser Ion Source

  J. Sauvage, N. Boos, L. Cabaret, J.E. Crawford, H.T. Duong, J. Genevey, M. Girod, G. Huber, F. Ibrahim, M. Krieg, [......], D. Verney, S. Zemlyanoi, J. Arianer, N. Barré, M. Ducourtieux, D. Forkel-Wirth, G. Le Scornet, J. Lettry, C. Richard-Serre, C. Véron
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  ABSTRACT: Laser spectroscopy measurements have been carried out on very neutron-deficient isotopes of Au, Pt and Ir, produced as daughter elements from a Hg ISOLDE beam. For these transitional region nuclides, the hyperfine structure (HFS) and isotope shift (IS) were measured by Resonance Ionization Spectroscopy (RIS). Magnetic moments μ, spectroscopic quadrupole moments Qs and changes of the nuclear mean square charge radius δ〈rc 2〉along isotopic series have been extracted. For some results, a detailed comparison with theoretical predictions is presented.
  Hyperfine Interactions 11/2000; 129(1):303-317. · 0.21 Impact Factor
• Chapter: Laser spectroscopy measurements of neutron-rich tellurium isotopes by COMPLIS

  R. Sifi, F. Le Blanc, N. Barré, L. Cabaret, J. Crawford, M. Ducourtieux, S. Essabaa, J. Genevey, G. Huber, M. Kowalska, C. Lau, J. K. P. Lee, G. Le Scornet, J. Oms, J. Pinard, B. Roussière, J. Sauvage, M. Seliverstov, H. Stroke, ISOLDE
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  ABSTRACT: Laser spectroscopy based on resonant ionization of laser-desorbed atoms has been used to study the neutron-rich tellurium isotopes with the COMPLIS facility at ISOLDE-CERN. Isotope shifts and hyperfine structures of several neutron-rich Te isotopes: 120–136Te and 123 m–133 mTe have been measured. From the hyperfine structure we have extracted magnetic and quadrupole moments. Changes in the mean square charge radii have been deduced and their comparison with the known data for the other elements near Z=50 is presented. The experimental δ<r 2> values are compared with those obtained from relativistic mean field calculations. Key wordslaser spectroscopy-isotope shift-hyperfine structure-nuclear moments
  01/1970: pages 173-179;
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  Available from: A.C. Mueller

  Article: Release properties of UC$_x$ and molten U targets

  B. Roussiere, F. Ibrahim, J. Sauvage, O. Bajeat, N. Barre, F. Clapier, E. Cottereau, C. Donzaud, M. Ducourtieux, S. Essabaa, [......], F. Le Blanc, A.C. Mueller, J. Obert, N. Pauwels, J.C. Potier, F. Pougheon, J. Proust, O. Sorlin, D. Verney, A. Wojtasiewicz
• Article: Study of the N=50 shell closure close to $^{78}$Ni

  D. Verney, F. Ibrahim, O. Perru, O. Bajeat, C. Bourgeois, F. Clapier, E. Cottereau, C. Donzaud, S. Du, M. Ducourtieux, [......], H. Lefort, F. Le Blanc, A.C. Mueller, N. Pauwels, J.C. Potier, F. Pougheon, J. Proust, B. Roussiere, J. Sauvage, O. Sorlin
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  Available from: R. Leroy

  Article: UC$_x$ target design for the SPIRAL 2 project and the ALTO project

  O. Bajeat, F Azaiez, C. Bourgeois, M. Cheikh Mahmed, H. Croizet, M. Ducourtieux, S. Essabaa, R. Sifi, S. Franchoo, F. Ibrahim, [......], P. Jardin, Y. Huguet, N. Lecesne, P Lecomte, R. Leroy, F. Pellemoine, M G Saint-Laurent, F. Nizery, D. Ridikas, R.V. Ribas
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  ABSTRACT: Two ways of production of radioactive beams using uranium carbide targets are taken into consideration: fission induced by fast neutrons and by bremsstrahlung radiation. For the SPIRAL 2 project, the fission of 238U in uranium carbide target will be induced by a neutron flow created by bombarding a carbon converter with a 40 MeV high intensity deuteron beam. Calculations and design of the target in order to reach 1013 fissions/s with good release time have been done. The second way is the photofission using an electron beam. In 2005 the ALTO project (Accélérateur Linéaire Auprès du Tandem d'Orsay) will give a 50 MeV/10$\mu$A electron beam. This facility will allow more than 1011 fissions/s. In this case, the electron beam hits the target without converter. Calculations realised in order to estimate the production are used to choose the best target shape. For the two cases some R & D on targets to improve release is described.
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  Available from: A.C. Mueller

  Article: Exotic beams produced by fast neutrons

  F. Clapier, A.C. Mueller, J. Obert, O. Bajeat, M. Ducourtieux, A. Ferro, A. Horbowa, L. Kotfila, C. Lau, H. Lefort, [......], N. Pauwels, J.C. Potier, J. Proust, J.C. Putaux, C.F. Liang, P. Paris, A.C.C. Villari, R. Lichtenthaler, L Maunoury, J Lettry
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  ABSTRACT: First results from the research and development program PARRNE (Production d'Atomes Radioactifs Riches en NEutrons) are presented. Its aim is the investigation of the optimum conditions for the production of neutron-rich fission fragment beams extracted from thick targets irradiated by fast neutrons.
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  Available from: A.C. Mueller

  Article: Recent studies to improve release properties from thick isotope separator on-line fission targets

  C. Lau, B. Roussière, D. Verney, O. Bajeat, F. Ibrahim, F. Clapier, E. Cottereau, C. Donzaud, M. Ducourtieux, S. Essabaa, [......], H. Lefort, F. Le Blanc, A.C. Mueller, J. Obert, N. Pauwels, J.C. Potier, F. Pougheon, J. Proust, J. Sauvage, A. Wojtasiewicz
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  ABSTRACT: In the framework of the PARRNe program (Production d’Atomes Radioactifs Riches en Neutrons) of IPN Orsay, various techniques are currently used to characterize the release properties of elements of interest from a UCX target. On-line studies have been carried out with two plasma ion sources: a Nier–Bernas and a hot plasma ISOLDE-type (the ISOLDE collaboration kindly supplied us a MK5 ion source for these studies). In parallel, the analysis of the chemical and structure properties of some UCX samples as function of heating conditions has been carried out. Such data are essential to determine optimal conditions for the production of isotopes by the isotope separator on-line (ISOL) technique. First results are presented here for Kr and Ag. Investigations for other kinds of fission targets are planned.
  Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms.
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  Available from: A.C. Mueller

  Article: Release of Kr, Ag, Sn, I and Xe from UCx targets

  B. Roussière, O. Bajeat, N. Barré, C. Bourgeois, F. Clapier, E. Cottereau, C. Donzaud, M. Ducourtieux, S. Essabaa, D. Guillemaud-Mueller, [......], A.C. Mueller, J. Obert, N. Pauwels, J.C. Potier, F. Pougheon, J. Proust, J. Sauvage, O. Sorlin, D. Verney, A. Wojtasiewicz
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  ABSTRACT: The release properties of a UCx thick target associated with a hot plasma ion source have been studied. Measurements have been performed for various elements: Kr, Ag, Sn, I and Xe. The analysis is made assuming pure diffusion or pure effusion as the release processes. The results obtained are compared to the data available in the literature.
  Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms.
• Article: Photo-fission for the production of radioactive beams ALTO project

  S. Essabaa, J. Arianer, P. Ausset, O. Bajeat, J.P. Baronick, F. Clapier, L. Coacolo, C. Donzaud, M. Ducourtieux, S. Galès, [......], B. Waast, L. Rinolfi, G. Rossat, D. Forkel-Wirth, A. Muller, G. Bienvenu, J.-C. Bourdon, T. Garvey, B. Jacquemard, M. Omeich
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  ABSTRACT: In order to probe neutron rich radioactive noble gases produced by photo-fission, a PARRNe-1 experiment (Production d’Atomes Radioactifs Riches en Neutrons) has been carried out at CERN. The incident electron beam of 50 MeV was delivered by the LIL machine: LEP Injector Linac. The experiment allowed us to compare under the same conditions two production methods of radioactive noble gases: fission induced by fast neutrons and photo-fission. The obtained results show that the use of the electrons is a promising mode to get intense neutron rich ion beams. After the success of this photo-fission experiment, a conceptual design for the installation at IPN Orsay of a 50 MeV electron accelerator close to the PARRNe-2 device has been worked out: ALTO Project. This work has started within a collaboration between IPNO, LAL (Laboratoire de l’Accélérateur Linéaire) and CERN groups.
  Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms.
• Article: $SH_{y}PIE: a new source for on line production of multicharged radioactive condensable ion beams

  N. Lecesne, J. C. Angélique, B. Blank, F. Clapier, M. Ducourtieux, P. Foury, G. Gaubert, Y. Huguet, S Kandri-Rody, P. Jardin, [......], N. A. Orr, J.Y. Pacquet, N. Pauwels, J. Proust, J.C. Putaux, E Robert, M G Saint-Laurent, D Seron, P. Sortais, A.C.C. Villari