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1. A Universal Fast Algorithm for Sensitivity-Based Structural Damage Detection

Author

Q. W. Yang, J. K. Liu, C.H. Li, and C.F. Liang

Subjects
Technology, Medicine, Science
Abstract

Structural damage detection using measured response data has emerged as a new research area in civil, mechanical, and aerospace engineering communities in recent years. In this paper, a universal fast algorithm is presented for sensitivity-based structural damage detection, which can quickly improve the calculation accuracy of the existing sensitivity-based technique without any high-order sensitivity analysis or multi-iterations. The key formula of the universal fast algorithm is derived from the stiffness and flexibility matrix spectral decomposition theory. With the introduction of the key formula, the proposed method is able to quickly achieve more accurate results than that obtained by the original sensitivity-based methods, regardless of whether the damage is small or large. Three examples are used to demonstrate the feasibility and superiority of the proposed method. It has been shown that the universal fast algorithm is simple to implement and quickly gains higher accuracy over the existing sensitivity-based damage detection methods.

Published
2013
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3. Graphite target for the SPIRAL project

Author

MO Ruault, Jean-Yves Pacquet, J. Mandin, A. Ferro, C.F. Liang, A.C.C. Villari, Marc Loiselet, P. Bertrand, P. Foury, M. Ducourtieux, J.C. Putaux, N. Pauwels, J. Proust, Guido Ryckewaert, J. Obert, O Kaitasov, L. Maunoury, L. Kotfila, E. Robert, Robert Leroy, Pascal Sortais, N. Lecesne, J.C. Potier, Ac. Mueller, Marcel Toulemonde, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), SPIRAL, and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, Materials science, 010308 nuclear & particles physics, Thermal resistance, Conical surface, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Electrical current, 0103 physical sciences, Thermal, Graphite, Irradiation, Detectors and Experimental Techniques, Composite material, 010306 general physics, Instrumentation, Spiral
Abstract

We present here a study of the thermal and physical properties of graphite targets for the SPIRAL project. The main objective was to develop an optimized set-up both mechanically and thermally resistant, presenting good release properties (hot targets with thin slices). We show here the results of irradiation tests concerning the mechanical and thermal resistance of the first prototype of SPIRAL target with conical geometry. We also study the micro-structural properties of the graphite target in order to check that the release properties are not deteriorated by the irradiation. Finally, we present the results concerning the latest pilot target internally heated by an electrical current. This setup has been especially designed to be used in case of low power primary beams.

Published
1997
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4. A Universal Fast Algorithm for Sensitivity-Based Structural Damage Detection

Author

Qiu Wei Yang, C.H. Li, C.F. Liang, and Jing Liu

Subjects
Damage detection, Article Subject, Computer science, lcsh:T, lcsh:R, Stiffness, lcsh:Medicine, General Medicine, Models, Theoretical, Fast algorithm, lcsh:Technology, General Biochemistry, Genetics and Molecular Biology, Matrix decomposition, Key (cryptography), medicine, Flexibility method, lcsh:Q, Sensitivity (control systems), medicine.symptom, lcsh:Science, Algorithm, Algorithms, General Environmental Science, Research Article
Abstract

Structural damage detection using measured response data has emerged as a new research area in civil, mechanical, and aerospace engineering communities in recent years. In this paper, a universal fast algorithm is presented for sensitivity-based structural damage detection, which can quickly improve the calculation accuracy of the existing sensitivity-based technique without any high-order sensitivity analysis or multi-iterations. The key formula of the universal fast algorithm is derived from the stiffness and flexibility matrix spectral decomposition theory. With the introduction of the key formula, the proposed method is able to quickly achieve more accurate results than that obtained by the original sensitivity-based methods, regardless of whether the damage is small or large. Three examples are used to demonstrate the feasibility and superiority of the proposed method. It has been shown that the universal fast algorithm is simple to implement and quickly gains higher accuracy over the existing sensitivity-based damage detection methods.

Published
2013
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5. Gradient-field electron guides for conversion electron studies

Author

C.F. Liang, P. Paris, B. Legrand, 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, Range (particle radiation), Luminosity (scattering theory), 010308 nuclear & particles physics, business.industry, Solenoid, Astrophysics::Cosmology and Extragalactic Astrophysics, Electron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, law.invention, Lens (optics), Optics, law, Atomic electron transition, 0103 physical sciences, 010306 general physics, business, Instrumentation, Electrostatic lens, Radioactive decay
Abstract

This article describes the general concept of the gradient field solenoid lens. Its properties concerning focusing/defocusing and non-dispersivity are underlined. Such a lens can be coupled with other more classical lenses and is well adapted to the measurement of conversion electron transitions, for radioactive decay or in-beam studies. The product of its energy range × luminosity can be very large. Various configurations are discussed and a specific construction is described.

Published
1995
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6. OCTUPOLE DEFORMATION IN 221<font>Fr</font>; E1 TRANSITION RATES

Author

C.F. Liang, R.K. Sheline, and A. Peghaire

Subjects
Physics, Mass number, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, Degenerate energy levels, General Physics and Astronomy, Astronomy and Astrophysics, Deformation (meteorology), 01 natural sciences, Molecular physics, Nuclear physics, Atomic orbital, 0103 physical sciences, Alpha decay, Spectroscopy, 010303 astronomy & astrophysics, Radioactive decay
Abstract

Experimental data following the alpha decay of 225 Ac are interpreted in terms of a spectroscopy in 221 Fr consistent with octupole deformation. However, the measured E1 transition probabilities suggest that the low lying bands in 221 Fr are considerably more mixed than in nuclei with slightly higher mass number. It is suggested that this mixing of states in 221 Fr is indicative of the partial collapse of Nilsson-like orbitals into more degenerate shell model orbitals.

Published
1990
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7. Broad and Flat Emission Spectrum from InGaAs/InGaAlAs Asymmetric Multiple Quantum Wells: Effect of Well-width and Modulation-Doping Profiles

Author

C.F. Liang, E.Y. Lin, David Jui-Yang Feng, C.Y. Chen, Tsong-Sheng Lay, and T.Y. Chang

Subjects
Materials science, Condensed Matter::Other, business.industry, Bandwidth (signal processing), Doping, Computer Science::Software Engineering, Physics::Optics, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Laser, law.invention, Gallium arsenide, chemistry.chemical_compound, Optics, chemistry, law, Optoelectronics, Emission spectrum, business, Luminescence, Quantum well, Diode
Abstract

Asymmetric InGaAs/InGaAlAs multi-quantum wells exhibit a = 1.55 /spl mu/m broad and flat emission spectrum with 3-dB bandwidth up to 2500 /spl Aring/. Emission spectra and laser diodes by the effects of well-width and modulation-doping profiles are presented.

Published
2006
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8. Release of Kr, Ag, Sn, I and Xe from UC$_x$ targets

Author

J. Sauvage, N. Pauwels, E. Cottereau, A. Wojtasiewicz, C. Lau, O. Bajeat, A. C. Mueller, S. Essabaa, F. Clapier, C. Bourgeois, D. Verney, B. Roussière, C. Donzaud, F. Ibrahim, C.F. Liang, N. Barré, D. Guillemaud-Mueller, F. Pougheon, J. Obert, J. Proust, M. Ducourtieux, O. Sorlin, H. Lefort, J.C. Potier, F. Le Blanc, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM)

Subjects
Nuclear and High Energy Physics, 25.85.Ec, 29.25.Rm, 29.30.Kv, 010308 nuclear & particles physics, Chemistry, Radiochemistry, Plasma, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Release time, Ion source, 0103 physical sciences, Diffusion (business), Uranium carbide targets, 010306 general physics, Instrumentation, Radioactive beams
Abstract

NESTER ACC; 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.

Published
2006
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9. On line isotopic separator test benches at GANIL

Author

M. Lewitowicz, P. Paris, A. Joubert, R. Leroy, C.F. Liang, P. Sortais, J.C. Putaux, J. Obert, M.G. St. Laurent, C. Tribouillard, R. Anne, N.A. Orr, B. Bru, J. C. Steckmeyer, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Test bench, Cyclotron, Separator (oil production), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Ion source, Isotope separation, law.invention, Ion, Nuclear physics, Isotopes of neon, law, ComputingMilieux_MISCELLANEOUS, Line (formation)
Abstract

A first version of an isotopic separator on line test bench has been built in order to test the feasibility of the production of radioactive species from 96 MeV/u of /sup 20/Ne impinging on a thick target of MgO. This test bench was equipped with a very compact ECR ion source (Nanogan) entirely made from permanent magnets and operating at 10 GHz. We succeeded in producing and ionizing /sup 18/Ne/sup 2,4+/; /sup 19/Ne/sup 1,2,3,4+/ and /sup 23,24/Ne/sup 1+/. We then decided to build a new higher performance separator (SIRa) allowing the use of different types of ion sources. It will be completed by the end of 1993. >

Published
2002
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10. Development of a two-stage magnetic electron-guide

Author

P Paris, C.F Liang, 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, Range (particle radiation), Toroid, 010308 nuclear & particles physics, business.industry, Solenoid, Electron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Magnetic field, Optics, 0103 physical sciences, Magnetic lens, Development (differential geometry), Atomic physics, 010306 general physics, business, Instrumentation, Energy (signal processing)
Abstract

A fully operational electron-guide, constituted by the succession of a toroidal magnetic lens and a solenoid, is described and its properties are tested. An absolute efficiency between 1% and 2.2% is obtained in a large energy range, from 150 keV to more than 2 MeV, together with a large β+ rejection. It is shown that a substantial efficiency increase can be obtained by superposing an axial magnetic field on the toroidal one.

Published
2002

11. Neutrons produits dans des cibles epaisses de Be et $^{238}$U irradiees par des deutons de 100MeV/u et dans une cible epaisse de C irradiee par des $^{36}$Ar de 95 MeV/u. Longueurs d'attenuation dans du beton et debit d'equivalent de dose resultant de l'activation de l'uranium

Author

R. Leroy, T. Granier, A.C.C. Villari, N. Pauwels, P. Gara, F. Clapier, M. Mirea, G. Bélier, J. Obert, J. Proust, C.F. Liang, T. Ethvignot, M. Bajard, 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), 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), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Renewable Energy, Sustainability and the Environment, Health, Toxicology and Mutagenesis, Radiochemistry, Public Health, Environmental and Occupational Health, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 021001 nanoscience & nanotechnology, 020401 chemical engineering, Nuclear Energy and Engineering, 0204 chemical engineering, 0210 nano-technology, Safety, Risk, Reliability and Quality, Waste Management and Disposal
Abstract

La production de neutrons secondaires issus de l'interaction dun faisceau de particules avec une cible epaisse a ete determinee a plusieurs angles par la methode des detecteurs a activation. Les couples projectile-cible etudies sont au nombre de trois : deutons (100 MeV/u) + 238U, deutons (100 MeV/u) + 9Be et 36Ar (95 MeV/u) + 12C. A 00 pour les cibles de Be et U, la mesure a aussi ete faite avant et apres des blocs de beton, ceci nous a permis d'evaluer les longueurs d'attenuation correspondantes en fonction de l'energie. L'evolution du debit de dose de la cible d'uranium a ete suivi durant plusieurs jours apres la fin de l'irradiation.

Published
1999
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12. Exotic beams produced by fast neutrons

Author

J. Proust, C. Lau, Jacques Lettry, P. Paris, O. Bajeat, F. Clapier, L. Maunoury, Rubens Lichtenthäler, A. Ferro, S. Kandri-Rody, A. C. Mueller, A.C.C. Villari, J.C. Putaux, M. Ducourtieux, A. Horbowa, N. Pauwels, J. C. Potier, H. Lefort, C.F. Liang, J. Obert, L. Kotfila, 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), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Nuclear and High Energy Physics, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Fission, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Surfaces and Interfaces, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], XX, 7. Clean energy, 01 natural sciences, Accelerators and Storage Rings, Neutron temperature, Nuclear physics, 07.77.+p, 29.25.-t, 0103 physical sciences, lcsh:QC770-798, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Neutron, Irradiation, 010306 general physics, Nuclear Experiment
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.

Published
1998
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13. A new method for measuring the absolute efficiency of isotope separation on-line systems

Author

J. Mandin, J.C. Putaux, J. Proust, Jean-Yves Pacquet, B. Blank, M. G. Saint-Laurent, M. Lewitowicz, P. Bertrand, F. Clapier, N. Lecesne, F De Las Heras, A. Joubert, Pascal Sortais, N.A. Orr, Antonio Villari, P. Paris, R. Leroy, J. C. Angélique, P. Foury, J.C. Potier, L. Maunoury, E. Robert, P. Jardin, M. Ducourtieux, C. Marry, J. Obert, Alinka Lepine-Szily, C.F. Liang, 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)-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-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), 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 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), and Lorgeril, Jocelyne

Subjects
Absolute efficiency, Arrhenius equation, Nuclear and High Energy Physics, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], 010308 nuclear & particles physics, Analytical chemistry, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Isotope separation, law.invention, symbols.namesake, chemistry, law, Ionization, 0103 physical sciences, symbols, Detectors and Experimental Techniques, Diffusion (business), 010306 general physics, Instrumentation, Carbon, Radioactive beam, Line (formation)
Abstract

A new method for measuring the absolute efficiency of Isotope Separation On-Line (ISOL) systems is described. The overall efficiency is deduced from the ratio between the rate of the radioactive beam detected after analysis and the rate of incident radioactive beam in the target. It is shown that the unfolding of the different efficiencies, i.e., diffusion, effusion, ionisation and transport allows us to deduce the diffusion constants when the absolute efficiency data is obtained as a function of the target temperature. Using this technique we extracted the fundamental Arrhenius constants for diffusion of Ar and Ne in Carbon targets used in the SIRa experiments at GANIL.

Published
1996

14. Mesure de vies moyennes de niveaux excités par effet Doppler γ après émission α ()

Author

A Peghaire and C.F Liang

Subjects
Physics, Range (particle radiation), symbols.namesake, Optics, business.industry, Picosecond, Excited state, symbols, General Medicine, Atomic physics, business, Doppler effect, Measure (mathematics)
Abstract

Using the γ Doppler shift following α decay, a method is described to measure the lifetimes of nuclear excited states in the picosecond range. This method should be applicable to many α-emitters. Five excited states in 219 Rn were measured and gave the following results • T 1 2 : 159 keV = (42.3±5.0) × 10 −12 s , • 269 keV = (14.2±2.3) × 10 −12 s, • 338 keV = (6.1±2.8) × 10 −12 s, • 376 keV = (6.9±3.9) × 10 −12 s, • 445 keV = (6.2±3.1) × 10 −12 s.

Published
1976
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15. Target ion source systems at the Orsay isocele 2 separator

Author

J. Sauvage-Letessier, J. Obert, B. Roussiere, A. Peghaire, C.F. Liang, L. Kotfila, J.C. Putaux, and P. Paris

Subjects
Synchrocyclotron, Isotope, Chemistry, Radiochemistry, Difluoride, General Engineering, Analytical chemistry, Separator (oil production), Isobaric process, Neutron, Plasma, Ion source
Abstract

We present a general survey of the various target experiments performed with the new ISOCELE 2 separator, on-line with the improved Orsay synchrocyclotron (present intensities: up to 2 μ A -200 MeV p , 1 μ A -283 MeV 3 He ). We use a versatile plasma ion-source of the Bernas-Chavet type, with the target inside the arc chamber. Results and tests on various melted metal targets are described; chemical evaporations and reactions in the ion-source are obtained by addition of reactive gases. Particularyly, we exploit isobaric separations on mono or difluoride molecular ion-beams. For instance, the first selective on-line separation of neutron deficient La isotopes were observed with this process. Difluoride La ion-beams show a very weak mixing with Ba and Cs isotopes.

Published
1981
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17. Étude de la décroissance de 157Tm(T1/2 = 3,3 min) et de 155Tm(T1/2 = 25 s)

Author

P. Aguer, G. Bastin, C.F. Liang, A. Peghaire, J. Libert, P. Paris, 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, gamma ray spectra, 010308 nuclear & particles physics, nuclear energy levels, Gamma ray spectra, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, [PHYS.HIST]Physics [physics]/Physics archives, conversion electron spectra, 0103 physical sciences, nuclei with mass number 150 to 189, radioactive decay schemes, Physical chemistry, beta decay, 010306 general physics
Abstract

Nous avons étudié les décroissances β+ + CE de 157 Tm (T1/2 = 3,3 min) et 155Tm (T 1/2 = 25 s) sur les niveaux de 157Er (N = 89) et 155Er (N = 87). Les sources isotopique-ment pures ont été obtenues grâce au séparateur ISOCELE 1 en ligne avec le synchrocyclotron d'Orsay. L'étude des spectres gamma, des spectres d'électrons de conversion et des coïncidences bidimensionnelles γ-γ a permis de proposer des schémas de niveaux pour ces noyaux de la zone de transition.

Published
1977
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18. I.R. and Raman spectra of europium(III) β-diketonates

Author

J.A. Trias, E.J. Schmitschek, and C.F. Liang

Subjects
Polymers and Plastics, Dibenzoylmethane, Acetylacetone, Analytical chemistry, chemistry.chemical_element, Ring (chemistry), Ion, chemistry.chemical_compound, Crystallography, symbols.namesake, chemistry, Deuterium, Halogen, Materials Chemistry, symbols, Europium, Raman spectroscopy
Abstract

The i.r. and Raman spectra of several complexes of europium(III) β-diketonates have been observed. The β-diketones used for the preparation of the complexes include acetylacetone, trifluoroacetylacetone, benzoyltrifluoroacetone, halogen substituted benzoyltrifluoroacetones (F, Cl, and Br mono-substituted into the benzene ring at various positions), benzoylacetone, dibenzoylmethane, and some of their deuterated analogs. Interpretations of the spectra have been attempted. It has been found that all the spectra can be interpreted, to a good approximation, by considering a single chelate ring withy a local C 2 v symmetry. However, some bands observed in the i.r. and Raman spectra of europium acetylacetonate have to be interpreted with a D 3 symmetry for the configuration of the three chelate rings attached to a europium atom. Possible symmetries suggested in the literature for the configuration of four chelate rings attached to a europium atom have been considered. From the i.r. and Raman spectra of the four-ligand complexes studied, it has been found that it is quite unlikely that the four-ligand anions belong to any one of the symmetry groups C 1 h , D 4 h , D 2 d , C 4 v , and C 2 v , but they may belong to the symmetry group S 4 or C 1 . Samples of europium benzoyltrifluoroacetonate have been prepared in the three-ligand and four-ligand forms. The similarity of the i.r. spectra of these samples suggests the applicability of the single chelate ring analysis. However, the Raman spectra of these samples showed striking differences indicating an approximate D 3 symmetry for the three-ligand anion. The i.r. spectra of several complexes prepared from some rare earth metals other than europium have also been studied and it has been found that the spectra are almost identical to their europium analogs.

Published
1970
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19. Étude du schéma de niveaux de 225Ac

Author

A. Peghaire, P. Aguer, and C.F. Liang

Subjects
Physics, Nuclear and High Energy Physics, Quantum mechanics, Perturbation (astronomy), Atomic physics, Coriolis coupling, Coincidence
Abstract

The 225Ac level scheme, populated by the α-branching (0.25%) of 229Pa, was investigated with an α-spectrograph and a two-dimensional α-γ coincidence device. The proposed level scheme was interpreted in terms of rotational bands and we tried to describe it in terms of the Nilsson configurations 3 2 + [651], 5 2 + [642], 3 2 − [532], and 5 2 − [523] . The perturbation bands due to the Coriolis coupling were also discussed.

Published
1973
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20. Description and performance of the isocele 2 separator

Author

J. Fournet, J. Obert, D. Lecouturier, A. Ferro, J.C. Putaux, C.F. Liang, A. Caruette, P. Paris, M. Arianer, J.L. Sarrouy, 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
010308 nuclear & particles physics, Computer science, 0103 physical sciences, General Engineering, Mechanical engineering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences, Separator (electricity)
Abstract

The second version of the Orsay medium current on-line separator is now complete and operational for regular physics experiments. Its essential features correspond precisely to the scheme described at the last EMIS conference. Therefore the emphasis here will be on the general conception of the separator, on concrete descriptions of particular devices and on corresponding performance. Target experiments are reported in another ISOCELE communication.

Published
1980

21. Selective on-line separation of new Ta, Zr and Sr isotopes

Author

J. Obert, P. Paris, C.F. Liang, S. Della Negra, J. C. Putaux, D. Bucurescu, 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 and High Energy Physics, Zirconium, Strontium, Materials science, Isotope, 010308 nuclear & particles physics, Radiochemistry, Tantalum, chemistry.chemical_element, Separator (oil production), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 3. Good health, chemistry, 0103 physical sciences, Nuclear fusion, 010306 general physics
Abstract

Tantalum 164 to 167, Zirconium 82 to 84 and Strontium 78 have been selectively observed at the ISOCELE-2 on-line mass separator (1) in the TaF4+, ZrF3+ and SrF+ compound form. New isotopes have been identified:165Ta (31.0±1.5 s),164Ta (13.7±0.6 s),82Zr, (32±5 s) and78Sr (2.5±0.3 mn).

Published
1982

22. ÉTUDE DE LA DÉCROISSANCE DE 158Tm

Author

G. Marguier, P. Paris, A. Charvet, C.F. Liang, P. Aguer, A. Peghaire, J. Libert, R. Duffait, 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
[PHYS.HIST]Physics [physics]/Physics archives, General Engineering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

Les niveaux excités de 158Er ont été étudiés par la décroissance (CE, β+) de 158Tm (T½ = 3,9 min). Les sources étaient obtenues par réaction, (p, xn) sur une cible d'erbium naturel, suivie d'une séparation en ligne avec le séparateur Isocèle d'Orsay. Les rayonnements y ont été étudiés par des méthodes classiques de coïncidences bi-dimensionnelles 2 048 × 2 048 canaux, les électrons de conversion ont été observés à l'aide d'un détecteur Si(Li) placé dans un sélecteur magnétique. Cent quatre-vingts rayonnements γ de 100 keV à 3 MeV ont été attribués à la désexcitation de 158Tm, et cent vingt d'entre eux ont été placés sur un schéma de niveaux. Une interprétation de ce schéma est proposée dans le cadre d'un modèle de noyaux déformés. C'est ainsi que, outre la bande de rotation bâtie sur le niveau fondamental, les bandes de rotation suivantes sont proposées : [MATH] L'examen des log ft nous fait enfin proposer pour le niveau fondamental de 158Tm les spin et parité 2-.

Published
1975
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23. One-line γ ray spectroscopic investigation of the 180Hg(T 1/2 = 3 s) decay chain

Author

C. Richard-Serre, J.P. Husson, C.F. Liang, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM)

Subjects
line intensities, sup 180 Pt, gamma ray spectra, nuclear energy level transitions, Gamma ray spectra, decay scheme, Nuclear isomer, on line gamma ray spectroscopic investigation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, gamma lines, Internal conversion, sup 180 Au, 0103 physical sciences, nuclei with mass number 150 to 189, half life, radioactive decay periods, 010306 general physics, Line (formation), Physics, Decay scheme, 010308 nuclear & particles physics, line energy, General Engineering, Gamma ray, Half-life, 3. Good health, sup 180 Hg decay chain, [PHYS.HIST]Physics [physics]/Physics archives, radioactive decay schemes, Decay chain, Atomic physics
Abstract

With the rebuilt ISOLDE 2 facility we have investigated on-line the 18080Hg decay products. The decay half-lives, the energies and intensities of the main γ lines of both 180Hg(T 1/2 = 3.0 ± 0.3 s) and 18079Au(T1/2 = 8.1 ± 0.3 s) , and a tentative decay scheme of 18078Pt are given.

Published
1977
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24. A simulation of the temperature distribution in the SPIRAL target

Author

Jean-Yves Pacquet, P. Jardin, E. Robert, J. Mandin, J.C. Putaux, Pascal Sortais, M. Ducourtieux, C.F. Liang, Marcel Toulemonde, Marc Loiselet, M. G. Saint-Laurent, N. A. Orr, P. Bertrand, O. Bajeat, B. Blank, P. Foury, Guido Ryckewaert, I. Tirrel, M. Lewitowicz, Alinka Lepine-Szily, J. C. Angélique, N. Lecesne, J. Obert, L. Maunoury, L. Boy, Rubens Lichtenthäler, H. Lefort, C. Marry, R. Leroy, Antonio Villari, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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), SPIRAL, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université 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)

Subjects
Physics, Nuclear and High Energy Physics, Computer simulation, Distribution (number theory), Computer program, 010308 nuclear & particles physics, 0103 physical sciences, Mechanics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences, Instrumentation, Spiral
Abstract

We developed a model and a computer program to calculate the temperature distribution in the target which will be used in the SPIRAL project a GANIL. The results of the numerical simulation are compared with measurements performed with several types of targets. (C) 1998 Elsevier Science B.V.

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25. Investigation of prolate-oblate shape-coexistence in $^{74}$Kr

Author

F. Becker, W. Korten, F. Hannachi, P. Paris, N. Buforn, C. Chandler, M. Houry, H. Hübel, A. Jansen, Y. Le Coz, C.F. Liang, A. Lopez-Martens, R. Lucas, E. Mergel, P. H., G. Schönwasser, C. Theisen, 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), 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, 010308 nuclear & particles physics, Hadron, Prolate spheroid, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 0103 physical sciences, Atomic nucleus, Oblate spheroid, Physics::Atomic and Molecular Clusters, Nuclear fusion, Atomic physics, 010306 general physics, Ground state, Spectroscopy, Mixing (physics)
Abstract

The atomic nucleus 74Kr has been investigated using combined conversion-electron (CE) and γ-ray spectroscopy. In order to confirm the existence of the expected low-lying isomeric 0+2 state, the possibility of an electric-monopole (E0) decay to the ground state was examined. The observation of an E0 transition at 508 keV allowed the determination of the mixing between coexisting prolate and oblate shapes.

26. On-line separation of163Ta and162Ta

Author

M. G. Porquet, C.F. Liang, P. Paris, J. C. Putaux, J. Obert, 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 and High Energy Physics, Materials science, Isotope, 010308 nuclear & particles physics, Separation (aeronautics), Analytical chemistry, Elementary particle, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 3. Good health, chemistry.chemical_compound, chemistry, 0103 physical sciences, Nuclear fusion, 010306 general physics, Fluoride, Line (formation)
Abstract

By on-line selective separation on molecular fluoride compounds at the ISOCELE 2 facility, two new isotopes:163Ta (T1/2=10.5+-1.8s) and162Ta (T1/2=3.5+-0.2s) have been identified.

Published
1985
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