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101. Fission Fragment characterization with FALSTAFF at NFS

Author

Pancin J., Materna T., Lehaut G., Ledoux X., Lecolley F.-R., Farget F., Doré D., and Panebianco S.

Subjects
Physics, QC1-999
Abstract

The Neutrons for Science (NFS) facility will be one of the first installations of the SPIRAL2 facility. NFS will be composed of a time-of-flight baseline and irradiation stations and will allow studying neutron-induced reactions for energies going from some hundreds of keV up to 40 MeV. Continuous and quasi-monoenergetic energy neutron beams will be available. Taking advantage of this new installation, the development of an experimental setup for a full characterization of actinide fission fragments in this energy domain has been undertaken. To achieve this goal a new detection system called FALSTAFF (Four Arm cLover for the STudy of Actinide Fission Fragments) in under development. In this paper, the characteristics of the NFS facility will be exposed and the motivations for the FALSTAFF experiment will be presented. The experimental setup will be described and the expected resolutions based on realistic GEANT4 simulations will be discussed.

Published
2013
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102. Measurement of mass yields from the 241Am(2nth,f) reaction at the Lohengrin Spectrometer

Author

Köster U., Kessedjian G., Faust H., Chabod S., Capellan N., Bidaud A., Panebianco S., Amouroux Ch., Letourneau A., Martin F., Materna T., Sage Ch., and Serot O.

Subjects
Physics, QC1-999
Abstract

The study of fission yields has a major impact on the characterization and understanding of the fission process and is mandatory for reactor applications. While the yields are known for the major actinides (235U, 239Pu) in the thermal neutron-induced fission, only few measurements have been performed on 242Am. The interest of 242Am concerns the reduction of radiotoxicity of 241Am in nuclear wastes using transmutation reactions. This paper presents the measurement of the fission mass yields from the reaction 241Am(2nth,f) performed at the Lohengrin mass spectrometer (ILL, France) for both the light and the heavy peaks: a total of 41 mass yields have been measured. The experiment was also meant to determine whether there is a difference in mass yields between the isomeric state and the ground state as it exists in fission and capture cross sections. The method used to address this question is based on a repeated measurement of a set of fission mass yields as a function of the ratio between the 242gAm and the 242mAm fission rates. The presented experiment is also a first step towards the measurement of the isotopic fission yields of 242Am.

Published
2013
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103. Development of a Gas Filled Magnet spectrometer coupled with the Lohengrin spectrometer for fission study

Author

Materna T., Köster U., Faust H., Chebboubi A., Kessedjian G., Sage C., and Serot O.

Subjects
Physics, QC1-999
Abstract

The accurate knowledge of the fission of actinides is necessary for studies of innovative nuclear reactor concepts. The fission yields have a direct influence on the evaluation of the fuel inventory or the reactor residual power after shutdown. A collaboration between the ILL, LPSC and CEA has developed a measurement program on fission fragment distributions at ILL in order to measure the isotopic and isomeric yields. The method is illustrated using the 233U(n,f)98Y reaction. However, the extracted beam from the Lohengrin spectrometer is not isobaric ions which limits the low yield measurements. Presently, the coupling of the Lohengrin spectrometer with a Gas Filled Magnet (GFM) is studied at the ILL in order to define and validate the enhanced purification of the extracted beam. This work will present the results of the spectrometer characterisation, along with a comparison with a dedicated Monte Carlo simulation especially developed for this purpose.

Published
2013
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105. First antineutrino energy spectrum from 235U fissions with the STEREO detector at ILL.

Author

Almazán, H, Bernard, L, Blanchet, A, Bonhomme, A, Buck, C, del Amo Sanchez, P, El Atmani, I, Labit, L, Lamblin, J, Letourneau, A, Lhuillier, D, Licciardi, M, Lindner, M, Materna, T, Pessard, H, Réal, J-S, Ricol, J-S, Roca, C, Rogly, R, and Salagnac, T

Subjects
NUCLEAR reactor cores, DETECTORS, ANTINEUTRINOS, BETA decay
Abstract

This article reports the measurement of the 235U-induced antineutrino spectrum shape by the Stereo experiment. 43 000 antineutrinos have been detected at about 10 m from the highly enriched core of the ILL reactor during 118 full days equivalent at nominal power. The measured inverse beta decay spectrum is unfolded to provide a pure 235U spectrum in antineutrino energy. A careful study of the unfolding procedure, including a cross-validation by an independent framework, has shown that no major biases are introduced by the method. A significant local distortion is found with respect to predictions around Eν ≃ 5.3 MeV. A Gaussian fit of this local excess leads to an amplitude of A = 12.1 ± 3.4% (3.5σ). [ABSTRACT FROM AUTHOR]

Published
2021
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106. The STEREO Experiment

Author

Allemandou , N., Almazán , H., Del Amo Sanchez , P., Bernard , L., Bernard , C., Blanchet , A., Bonhomme , A., Bosson , G., Bourrion , O., Bouvier , J., Buck , C., Caillot , V., Chala , M., Champion , P., Charon , P., Collin , A., Contrepois , P., Coulloux , G., Deleglise , G., El Kanawati , W., Favier , J., Fuard , S., Gomes Monteiro , I., Gramlich , B., Haser , J., Helaine , V., Heusch , M., Jentschel , M., Kandzia , F., Konrad , G., Köster , U., Kox , S., Lahonde-Hamdoun , C., Lamblin , J., Letourneau , A., Lhuillier , D., Li , C., Lindner , M., Manzanillas , L., Materna , T., Méplan , O., Minotti , A., Monon , C., Montanet , F., Nunio , F., Peltier , F., Penichot , Y., Pequignot , M., Pessard , H., Piret , Y., Prono , G., Quéméner , G., Real , J.-S., Roca , C., Salagnac , T., Sergeyeva , V., Schoppmann , S., Scola , L., Scordilis , J.-P., Soldner , T., Stutz , A., Tourres , D., Vescovi , C., Zsoldos , S., Laboratoire d'Annecy de Physique des Particules ( LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules ), Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Université Savoie Mont Blanc ( USMB [Université de Savoie] [Université de Chambéry] ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Physique Subatomique et de Cosmologie ( LPSC ), Université Joseph Fourier - Grenoble 1 ( UJF ) -Institut polytechnique de Grenoble - Grenoble Institute of Technology ( Grenoble INP ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique ( CNRS ) -Université Grenoble Alpes ( UGA ), Service des Réacteurs et de Mathématiques Appliquées ( SERMA ), Département de Modélisation des Systèmes et Structures ( DM2S ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Institut Laue-Langevin ( ILL ), ILL, Ecole Nationale Supérieure d'Ingénieurs de Caen ( ENSICAEN ), Normandie Université ( NU ), and STEREO

Subjects
neutrino: detector, Physics::Instrumentation and Detectors, shielding, [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex], antineutrino: nuclear reactor, High Energy Physics::Experiment, neutrino: sterile, [ PHYS.PHYS.PHYS-INS-DET ] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], detector: design, background: suppression, performance, activity report, Physics::Geophysics
Abstract

The STEREO experiment is a very short baseline reactor antineutrino experiment aiming at testing the hypothesis of light sterile neutrinos as an explanation of the deficit of the observed neutrino interaction rate with respect to the predicted rate, known as the Reactor Antineutrino Anomaly. The detector center is located 10 m away from the compact, highly $^{235}$U enriched core of the research nuclear reactor of the Institut Laue Langevin in Grenoble, France. This paper describes the STEREO site, the detector components and associated shielding designed to suppress the external sources of background which were characterized on site. It reports the performances in terms of detector response and energy reconstruction.

Published
2018

107. Improved STEREO simulation with a new gamma ray spectrum of excited gadolinium isotopes using FIFRELIN

Author

Almazán, H., primary, Bernard, L., additional, Blanchet, A., additional, Bonhomme, A., additional, Buck, C., additional, Chebboubi, A., additional, del Amo Sanchez, P., additional, El Atmani, I., additional, Haser, J., additional, Kandzia, F., additional, Kox, S., additional, Labit, L., additional, Lamblin, J., additional, Letourneau, A., additional, Lhuillier, D., additional, Lindner, M., additional, Litaize, O., additional, Materna, T., additional, Minotti, A., additional, Pessard, H., additional, Réal, J. -S., additional, Roca, C., additional, Salagnac, T., additional, Savu, V., additional, Schoppmann, S., additional, Sergeyeva, V., additional, Soldner, T., additional, Stutz, A., additional, Thulliez, L., additional, and Vialat, M., additional

Published
2019
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108. Lifetime of the ($15/{2}_{1}^{-}$) state in 135Te

Author

Simpson, G, primary, Regis, J M, additional, Bettermann, L, additional, Genevey, J, additional, Jolie, J, additional, Köster, U, additional, Materna, T, additional, Malkiewicz, T, additional, Muraz, J-F, additional, Pinston, J A, additional, Roussiere, B, additional, and Thiamova, G, additional

Published
2019
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109. Chronology of the three-body dissociation of 8He

Author

Laurent, B, primary, Marqués, F M, additional, Angulo, C, additional, Ashwood, N I, additional, Borge, M J G, additional, Bouchat, V, additional, Catford, W N, additional, Clarke, N M, additional, Curtis, N, additional, Freer, M, additional, Hanappe, F, additional, Kinnard, V, additional, Labiche, M, additional, Materna, T, additional, McEwan, P, additional, Nilsson, T, additional, Ninane, A, additional, Normand, G, additional, Orr, N A, additional, Pain, S D, additional, Prokhorova, E, additional, Stuttgé, L, additional, and Timis, C, additional

Published
2019
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112. The Neutrons for Science Facility at SPIRAL-2

Author

Ledoux, X., Aiche, M., Avrigeanu, M., Avrigeanu, V., Balanzat, E., Ban-d'Etat, B., Ban, G., Bauge, E., Belier, G., Bem, P., Borcea, C., Caillaud, T., Chatillon, A., Czajkowski, S., Dessagne, P., Dore, D., Fischer, U., Fregeau, M. O., Grinyer, J., Guillous, S., Gunsing, F., Gustavsson, Cecilia, Henning, G., Jacquot, B., Jansson, Kaj, Jurado, B., Kerveno, M., Klix, A., Landoas, O., Lecolley, F. R., Lecouey, J. L., Majerle, M., Marie, N., Materna, T., Mrazek, J., Novak, J., Oberstedt, S., Oberstedt, A., Panebianco, S., Perrot, L., Plompen, A. J. M., Pomp, Stephan, Prokofiev, Alexander, Ramillon, J. M., Farget, F., Ridikas, D., Rosse, B., Serot, O., Simakov, S. P., Simeckova, E., Stanoiu, M., Stefanik, M., Sublet, J. C., Taieb, J., Tarrio, Diego, Tassan-Got, L., Thfoin, I., Varignon, C., Ledoux, X., Aiche, M., Avrigeanu, M., Avrigeanu, V., Balanzat, E., Ban-d'Etat, B., Ban, G., Bauge, E., Belier, G., Bem, P., Borcea, C., Caillaud, T., Chatillon, A., Czajkowski, S., Dessagne, P., Dore, D., Fischer, U., Fregeau, M. O., Grinyer, J., Guillous, S., Gunsing, F., Gustavsson, Cecilia, Henning, G., Jacquot, B., Jansson, Kaj, Jurado, B., Kerveno, M., Klix, A., Landoas, O., Lecolley, F. R., Lecouey, J. L., Majerle, M., Marie, N., Materna, T., Mrazek, J., Novak, J., Oberstedt, S., Oberstedt, A., Panebianco, S., Perrot, L., Plompen, A. J. M., Pomp, Stephan, Prokofiev, Alexander, Ramillon, J. M., Farget, F., Ridikas, D., Rosse, B., Serot, O., Simakov, S. P., Simeckova, E., Stanoiu, M., Stefanik, M., Sublet, J. C., Taieb, J., Tarrio, Diego, Tassan-Got, L., Thfoin, I., and Varignon, C.

Abstract

The neutrons for science (NFS) facility is a component of SPIRAL-2, the new superconducting linear accelerator built at GANIL in Caen (France). The proton and deuteron beams delivered by the accelerator will allow producing intense neutron fields in the 100 keV-40 MeV energy range. Continuous and quasi-mono-kinetic energy spectra, respectively, will be available at NFS, produced by the interaction of a deuteron beam on a thick Be converter and by the Li-7(p, n) reaction on thin converter. The pulsed neutron beam, with a flux up to two orders of magnitude higher than those of other existing time-of-flight facilities, will open new opportunities of experiments in fundamental research as well as in nuclear data measurements. In addition to the neutron beam, irradiation stations for neutron-, proton- and deuteron-induced reactions will be available for cross-sections measurements and for the irradiation of electronic devices or biological cells. NFS, whose first experiment is foreseen in 2018, will be a very powerful tool for physics, fundamental research as well as applications like the transmutation of nuclear waste, design of future fission and fusion reactors, nuclear medicine or test and development of new detectors.

Published
2018
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114. New measurements on isomeric, isotopic and isobaric fission product yields for $^{241}$Pu thermal neutron-induced fission

Author

Julien-Laferriere, S., Kessedjian, G., Serot, O., Chebboubi, A., Bernard , D., Blanc, A., Koster, U., Litaize, O., Materna, T., Meplan, O., Rapala, M., Sage, C., CEA-Direction de l'Energie Nucléaire (CEA-DEN), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Institut Laue-Langevin (ILL), ILL, AstroParticule et Cosmologie (APC (UMR_7164)), 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)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], fission yields, LOHENGRIN, Pu241, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

International audience; Nuclear fission yields data measurements for thermal neutron induced fissionof 241Pu have been carried out at the Institut Laue Langevin (ILL) in Grenoble, using theLohengrin mass spectrometer. Mass, isotopic and isomeric yields have been extracted forthe last measurements. A focus is given in this document to the mass yield results whichare obtained for almost the entire heavy peak and most of the light high yields masses,along with the covariance matrix. The mean kinetic energy as a function of the fissionproduct mass has also been extracted from the measurements. The total mean kineticenergy pre and post neutron emission have been assessed and compared to other worksshowing a rather good agreement.

Published
2017
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115. Anomalies in the Charge Yields of Fission Fragments from the U(n,f)238 Reaction

Author

Wilson, J. N., Lebois, M., Qi, L., Amador-Celdran, P., Bleuel, D., Briz, J. A., Carroll, R., Catford, Wilton, De Witte, H., Doherty, D. T., Eloirdi, R., Georgiev, G., Gottardo, A., Goasduff, A., Hadyńska-Klęk, K., Hauschild, K., Hess, H., Ingeberg, V., Konstantinopoulos, T., Ljungvall, J., Lopez-Martens, A., Lorusso, G., Lozeva, R., Lutter, R., Marini, P., Matea, I., Materna, T., Mathieu, L., Oberstedt, A., Oberstedt, S., Panebianco, S., Podolyak, Zsolt, Porta, A., Regan, Patrick, Reiter, P., Rezynkina, K., Rose, S. J., Sahin, E., Seidlitz, M., Serot, O., Shearman, Robert, Siebeck, B., Siem, S., Smith, A. G., Tveten, G. M., Verney, D., Warr, N., Zeiser, F., and Zielinska, M.

Subjects
Nuclear Theory, Physics::Atomic and Molecular Clusters, Nuclear Experiment
Abstract

Fast-neutron-induced fission of 238U at an energy just above the fission threshold is studied with a novel technique which involves the coupling of a high-efficiency γ-ray spectrometer (MINIBALL) to an inverse-kinematics neutron source (LICORNE) to extract charge yields of fission fragments via γ−γ coincidence spectroscopy. Experimental data and fission models are compared and found to be in reasonable agreement for many nuclei; however, significant discrepancies of up to 600% are observed, particularly for isotopes of Sn and Mo. This indicates that these models significantly overestimate the standard 1 fission mode and suggests that spherical shell effects in the nascent fission fragments are less important for low-energy fast-neutron-induced fission than for thermal neutron-induced fission. This has consequences for understanding and modeling the fission process, for experimental nuclear structure studies of the most neutron-rich nuclei, for future energy applications (e.g., Generation IV reactors which use fast-neutron spectra), and for the reactor antineutrino anomaly.

Published
2017

116. Fission fragment yield distribution in the heavy-mass region from the $^{239}\mathrm{Pu}$ (${n}_{\mathrm{th}},f$) reaction

Author

Gupta, Y.K., Biswas, D.C., Serot, O., Bernard , D., Litaize, O., Julien-Laferrière, S., Chebboubi, A., Kessedjian, G., Sage, C., Blanc, A., Faust, H., Köster, U., Ebran, A., Mathieu, L., Letourneau, A., Materna, T., Panebianco, S., CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Institut Laue-Langevin (ILL), ILL, Direction des Applications Militaires (DAM), 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), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), Laboratoire de Physique Subatomique et de Cosmologie ( LPSC ), Université Joseph Fourier - Grenoble 1 ( UJF ) -Institut polytechnique de Grenoble - Grenoble Institute of Technology ( Grenoble INP ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique ( CNRS ) -Université Grenoble Alpes ( UGA ), Institut Laue-Langevin ( ILL ), Direction des Applications Militaires ( DAM ), 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 National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), and Université Grenoble Alpes (UGA)

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

International audience; The fission fragment yield distribution has been measured in the Pu239nth,f reaction in the mass region of A=126 to 150 using the Lohengrin recoil-mass spectrometer. Three independent experimental campaigns were performed, allowing a significant reduction of the uncertainties compared to evaluated nuclear data libraries. The long-standing discrepancy of around 10% for the relative yield of A=134 reported in JEF-2.2 and JEFF-3.1.1 data libraries is finally solved. Moreover, the measured mass distribution in thermal neutron-induced fission does not show any significant dip around the shell closure (A=136) as seen in heavy-ion fission data of Pb208(O18, f) and U238(O18, f) reactions. Lastly, comparisons between our experimental data and the predictions from Monte Carlo codes (gef and fifrelin) are presented and discussed.

Published
2017
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117. Shape coexistence in the odd-odd nucleus $^{98}\mathrm{Y}$: The role of the ${g}_{9/2}$ neutron extruder

Author

Urban, W., Czerwiński, M., Kurpeta, J., Rząca-Urban, T., Wiśniewski, J., Materna, T., Iskra, Ł. W., Smith, A.G., Ahmad, I., Blanc, A., Faust, H., Köster, U., Jentschel, M., Mutti, P., Soldner, T., Simpson, G.S., Pinston, J.A., De France, G., Ur, C.A., Elomaa, V.V., Eronen, T., Hakala, J., Jokinen, A., Kankainen, A., Moore, I.D., Rissanen, J., Saastamoinen, A., Szerypo, J., Weber, C., Äystö, J., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Laue-Langevin (ILL), ILL, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), 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 Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])

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

International audience; Excited states in $^{98}$Y, populated in neutron-induced fission of U$^{235}$ and in spontaneous fission of $^{248}$Cm and $^{252}$Cf, have been studied by means of $\gamma$ spectroscopy using the Lohengrin fission-fragment separator at ILL Grenoble and the EXILL, Eurogam2, and Gammasphere Ge arrays. Two new isomers have been found in $^{98}$Y: a deformed one with T$_{1/2}$=180(7) ns and a rotational band on top of it, and a spherical one with T$_{1/2}$=0.45(15)μs, analogous to the 8$^+$ isomer in $^{96}$Y, corresponding to the (νg7/2,πg$_{9/2}$)8$^+$ spherical configuration. Using the JYFLTRAP Penning trap, an accurate excitation energy of 465.7(7) keV has been determined for the 2.36-s isomer in $^{98}$Y. This result and the studies of excited levels in $^{98}$Zr, populated in β$^−$ decay of the isomer, indicate a new spin-parity, Iπ=(7)$^+$ for the isomer. The high spin and the decay properties of this isomer suggest the presence of the 9/2$^+$[404] neutron extruder orbital in its structure. This is consistent with the large deformation of the isomer, reported recently. The present work does not provide arguments to support the special role of the νg7/2-πg$_{9/2}$ interaction (the spin-orbit-partner, or SOP, mechanism).

Published
2017
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118. Shape coexistence in the odd-odd nucleus 98Y : the role of the g9/2 neutron extruder

Author

Urban, W., Czerwinski, M., Kurpeta, J., Rzaca-Urban, T., Wisniewski, J., Materna, T., Iskra, L. W., Smith, A. G., Ahmad, I., Blanc, A., Faust, H., Köster, U., Jentschel, M., Mutti, P., Soldner, T., Simpson, G. S., Pinston, J. A., France, G. de, Ur, C. A., Elomaa, Viki-Veikko, Eronen, Tommi, Hakala, Jani, Jokinen, Ari, Kankainen, Anu, Moore, Iain, Rissanen, Juho, Saastamoinen, Antti, Szerypo, Jerzy, Weber, Christine, and Äystö, Juha

Subjects
level densities, leveys, lifetimes, energy levels, isomer decays, nuclear structure and decayss
Abstract

Excited states in 98Y, populated in neutron-induced fission of 235U and in spontaneous fission of 248Cm and 252Cf, have been studied by means of γ spectroscopy using the Lohengrin fission-fragment separator at ILL Grenoble and the EXILL, Eurogam2, and Gammasphere Ge arrays. Two new isomers have been found in 98Y: a deformed one with T1/2 = 180(7) ns and a rotational band on top of it, and a spherical one with T1/2 = 0.45(15)μs, analogous to the 8+ isomer in 96Y, corresponding to the (νg7/2,πg9/2)8+ spherical configuration. Using the JYFLTRAP Penning trap, an accurate excitation energy of 465.7(7) keV has been determined for the 2.36-s isomer in 98Y. This result and the studies of excited levels in 98Zr, populated in β− decay of the isomer, indicate a new spin-parity, I π = (7)+ for the isomer. The high spin and the decay properties of this isomer suggest the presence of the 9/2+[404] neutron extruder orbital in its structure. This is consistent with the large deformation of the isomer, reported recently. The present work does not provide arguments to support the special role of the νg7/2 - πg9/2 interaction (the spin-orbit-partner, or SOP, mechanism). peerReviewed

Published
2017

119. The STEREO experiment

Author

Allemandou, N., primary, Almazán, H., additional, Sanchez, P. del Amo, additional, Bernard, L., additional, Bernard, C., additional, Blanchet, A., additional, Bonhomme, A., additional, Bosson, G., additional, Bourrion, O., additional, Bouvier, J., additional, Buck, C., additional, Caillot, V., additional, Chala, M., additional, Champion, P., additional, Charon, P., additional, Collin, A., additional, Contrepois, P., additional, Coulloux, G., additional, Desbrières, B., additional, Deleglise, G., additional, Kanawati, W. El, additional, Favier, J., additional, Fuard, S., additional, Monteiro, I. Gomes, additional, Gramlich, B., additional, Haser, J., additional, Helaine, V., additional, Heusch, M., additional, Jentschel, M., additional, Kandzia, F., additional, Konrad, G., additional, Köster, U., additional, Kox, S., additional, Lahonde-Hamdoun, C., additional, Lamblin, J., additional, Letourneau, A., additional, Lhuillier, D., additional, Li, C., additional, Lindner, M., additional, Manzanillas, L., additional, Materna, T., additional, Méplan, O., additional, Minotti, A., additional, Monon, C., additional, Montanet, F., additional, Nunio, F., additional, Peltier, F., additional, Penichot, Y., additional, Pequignot, M., additional, Pessard, H., additional, Piret, Y., additional, Prono, G., additional, Quéméner, G., additional, Real, J.-S., additional, Roca, C., additional, Salagnac, T., additional, Sergeyeva, V., additional, Schoppmann, S., additional, Scola, L., additional, Scordilis, J.-P., additional, Soldner, T., additional, Stutz, A., additional, Tourres, D., additional, Vescovi, C., additional, and Zsoldos, S., additional

Published
2018
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120. Quasiparticle phonon model description of low-energy states in Pr152

Author

Alexa, P., primary, Ramdhane, M., additional, Thiamova, G., additional, Simpson, G. S., additional, Faust, H. R., additional, Genevey, J., additional, Köster, U., additional, Materna, T., additional, Orlandi, R., additional, Pinston, J. A., additional, Scherillo, A., additional, and Hons, Z., additional

Published
2018
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121. Non destructive neutron diffraction measurements of cavities, inhomogeneities, and residual strain in bronzes of Ghiberti's relief from the Gates of Paradise.

Author

Festa, G., Senesi, R., Alessandroni, M., Andreani, C., Vitali, G., Porcinai, S., Giusti, A. M., Materna, T., and Paradowska, A. M.

Subjects
NEUTRON diffraction, BRONZE, STRAINS & stresses (Mechanics), MANUFACTURING processes, PARTICLES (Nuclear physics)
Abstract

Quantitative neutron studies of cultural heritage objects provide access to microscopic, mesoscopic, and macroscopic structures in a nondestructive manner. In this paper we present a neutron diffraction investigation of a Ghiberti Renaissance gilded bronze relief devoted to the measurement of cavities and inhomogeneities in the bulk of the sample, along with the bulk phase composition and residual strain distribution. The quantitative measurements allowed the determination of the re-melting parts extension, as well as improving current knowledge about the manufacturing process. The study provides significant and unique information to conservators and restorators about the history of the relief. [ABSTRACT FROM AUTHOR]

Published
2011
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122. The neutrons for science facility at SPIRAL-2

Author

Ledoux, X., Aïche, M., Avrigeanu, M., Avrigeanu, V., Balanzat, E., Ban-d'Etat, B., Ban, G., Bauge, E., Bélier, G., Bém, P., Borcea, C., Caillaud, T., Chatillon, A., Czajkowski, S., Dessagne, P., Doré, D., Fischer, U., Frégeau, M. O., Grinyer, J., Guillous, S., Gunsing, F., Gustavsson, Cecilia, Henning, G., Jacquot, B., Jansson, Kaj, Jurado, B., Kerveno, M., Klix, A., Landoas, O., Lecolley, F. R., Lecouey, J. L., Majerle, M., Marie, N., Materna, T., Mrázek, J., Negoita, F., Novák, J., Oberstedt, S., Oberstedt, A., Panebianco, S., Perrot, L., Plompen, A. J. M., Pomp, Stephan, Prokofiev, Alexander, Ramillon, J. M., Farget, F., Ridikas, D., Rossé, B., Sérot, O., Simakov, S. P., Šimečková, E., Štefánik, M., Sublet, J. C., Taïeb, J., Tarrío, Diego, Tassan-Got, L., Thfoin, I., Varignon, C., Ledoux, X., Aïche, M., Avrigeanu, M., Avrigeanu, V., Balanzat, E., Ban-d'Etat, B., Ban, G., Bauge, E., Bélier, G., Bém, P., Borcea, C., Caillaud, T., Chatillon, A., Czajkowski, S., Dessagne, P., Doré, D., Fischer, U., Frégeau, M. O., Grinyer, J., Guillous, S., Gunsing, F., Gustavsson, Cecilia, Henning, G., Jacquot, B., Jansson, Kaj, Jurado, B., Kerveno, M., Klix, A., Landoas, O., Lecolley, F. R., Lecouey, J. L., Majerle, M., Marie, N., Materna, T., Mrázek, J., Negoita, F., Novák, J., Oberstedt, S., Oberstedt, A., Panebianco, S., Perrot, L., Plompen, A. J. M., Pomp, Stephan, Prokofiev, Alexander, Ramillon, J. M., Farget, F., Ridikas, D., Rossé, B., Sérot, O., Simakov, S. P., Šimečková, E., Štefánik, M., Sublet, J. C., Taïeb, J., Tarrío, Diego, Tassan-Got, L., Thfoin, I., and Varignon, C.

Abstract

Numerous domains, in fundamental research as well as in applications, require the study of reactions induced by neutrons with energies from few MeV up to few tens of MeV. Reliable measurements also are necessary to improve the evaluated databases used by nuclear transport codes. This energy range covers a large number of topics like transmutation of nuclear waste, design of future fission and fusion reactors, nuclear medicine or test and development of new detectors. A new facility called Neutrons For Science (NFS) is being built for this purpose on the GANIL site at Caen (France). NFS is composed of a pulsed neutron beam for time-of-flight facility as well as irradiation stations for cross-section measurements. Neutrons will be produced by the interaction of deuteron and proton beams, delivered by the SPIRAL-2 linear accelerator, with thick or thin converters made of beryllium or lithium. Continuous and quasi-mono-energetic spectra will be available at NFS up to 40 MeV. In this fast energy region, the neutron flux is expected to be up to 2 orders of magnitude higher than at other existing time-of-flight facilities. In addition, irradiation stations for neutron-, proton- and deuteron-induced reactions will allow performing cross-section measurements by the activation technique. After a description of the facility and its characteristics, the experiments to be performed in the short and medium term will be presented.

Published
2017
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123. PRODUCTION AND STUDY OF NEUTRON-RICH NUCLEI USING THE LICORNE DIRECTIONAL NEUTRON SOURCE

Author

Wilson, J. N., Lebois, M., Qi, L., Amador-Celdran, P., Bleuel, D., Briz, J. A., Carroll, R., Catford, W., De Witte, H., Doherty, D., Eloirdi, R., Georgiev, G., Gottardo, A., Goasduff, A., Hadynska-Klek, K., Hauschild, K., Hess, M., Ingeberg, V., Konstantinopoulos, T., Ljungvall, J., Lopez-Martens, A., Lorusso, G., Lozeva, R., Lutter, R., Marini, P., Matea, I., Materna, T., Mathieu, L., Oberstedt, A., Oberstedt, S., Panebianco, S., Podolyak, Z., Porta, A., Regan, P. H., Reiter, P., Rezynkina, K., Rose, S. J., Sahin, E., Seidlitz, M., Shearman, R., Siebeck, B., Siem, S., Smith, A. G., Tveten, G. M., Verney, D., Warr, N., Zeiser, F., Zielinska, M., Wilson, J. N., Lebois, M., Qi, L., Amador-Celdran, P., Bleuel, D., Briz, J. A., Carroll, R., Catford, W., De Witte, H., Doherty, D., Eloirdi, R., Georgiev, G., Gottardo, A., Goasduff, A., Hadynska-Klek, K., Hauschild, K., Hess, M., Ingeberg, V., Konstantinopoulos, T., Ljungvall, J., Lopez-Martens, A., Lorusso, G., Lozeva, R., Lutter, R., Marini, P., Matea, I., Materna, T., Mathieu, L., Oberstedt, A., Oberstedt, S., Panebianco, S., Podolyak, Z., Porta, A., Regan, P. H., Reiter, P., Rezynkina, K., Rose, S. J., Sahin, E., Seidlitz, M., Shearman, R., Siebeck, B., Siem, S., Smith, A. G., Tveten, G. M., Verney, D., Warr, N., Zeiser, F., and Zielinska, M.

Abstract

We have recently successfully demonstrated a new technique for production and study of many of the most exotic neutron-rich nuclei at moderate spins. LICORNE, a newly developed directional inverse-kinematic fast neutron source at the IPN Orsay, was coupled to the MINIBALL high resolution gamma-ray spectrometer to study nuclei the furthest from stability using the U-238 (n, f) reaction. This reaction and Th-232 (n, f) are the most neutron-rich fission production mechanisms achievable and can be used to simultaneously populate hundreds of neutron-rich nuclei up to spins of approximate to 16 h. High selectivity in the experiment was achieved via triple gamma-ray coincidences and the use of a 400 ns period pulsed neutron beam, a technique which is unavailable to other population mechanisms such as U-235 (n(th), f) and Cf-252(SF). The pulsing allows time correlations to be exploited to separate delayed gamma rays from isomeric states in the hundreds of nuclei produced, which are then used to cleanly select a particular nucleus and its exotic binary partners. In the recent experiment, several physics cases are simultaneously addressed such as shape coexistence, the evolution of shell closures far from stability, and the spectroscopy of nuclei in the r-process path near N = 82. Preliminary physics results on anomalies in the U-238 (n, f) fission yields and the structure of the Te-138 and Sr-100 nuclei will soon be published. A future project, nu-ball, to couple LICORNE with a hybrid escape-suppressed spectrometer to refine further the technique and achieve a large increase in the observational limit is discussed.

Published
2017

124. Anomalies in the Charge Yields of Fission Fragments from the U-238(n, f) Reaction

Author

Wilson, J. N., Lebois, M., Qi, L., Amador-Celdran, P., Bleuel, D., Briz, J. A., Carroll, R., Catford, W., De Witte, H., Doherty, D. T., Eloirdi, R., Georgiev, G., Gottardo, A., Goasduff, A., Hadynska-Klek, K., Hauschild, K., Hess, H., Ingeberg, V., Konstantinopoulos, T., Ljungvall, J., Lopez-Martens, A., Lorusso, G., Lozeva, R., Lutter, R., Marini, P., Matea, I., Materna, T., Mathieu, L., Oberstedt, A., Oberstedt, S., Panebianco, S., Podolyak, Zs., Porta, A., Regan, P. H., Reiter, P., Rezynkina, K., Rose, S. J., Sahin, E., Seidlitz, M., Serot, O., Shearman, R., Siebeck, B., Siem, S., Smith, A. G., Tveten, G. M., Verney, D., Warr, N., Zeiser, F., Zielinska, M., Wilson, J. N., Lebois, M., Qi, L., Amador-Celdran, P., Bleuel, D., Briz, J. A., Carroll, R., Catford, W., De Witte, H., Doherty, D. T., Eloirdi, R., Georgiev, G., Gottardo, A., Goasduff, A., Hadynska-Klek, K., Hauschild, K., Hess, H., Ingeberg, V., Konstantinopoulos, T., Ljungvall, J., Lopez-Martens, A., Lorusso, G., Lozeva, R., Lutter, R., Marini, P., Matea, I., Materna, T., Mathieu, L., Oberstedt, A., Oberstedt, S., Panebianco, S., Podolyak, Zs., Porta, A., Regan, P. H., Reiter, P., Rezynkina, K., Rose, S. J., Sahin, E., Seidlitz, M., Serot, O., Shearman, R., Siebeck, B., Siem, S., Smith, A. G., Tveten, G. M., Verney, D., Warr, N., Zeiser, F., and Zielinska, M.

Abstract

Fast-neutron-induced fission of U-238 at an energy just above the fission threshold is studied with a novel technique which involves the coupling of a high-efficiency.-ray spectrometer (MINIBALL) to an inversekinematics neutron source (LICORNE) to extract charge yields of fission fragments via gamma-gamma coincidence spectroscopy. Experimental data and fission models are compared and found to be in reasonable agreement for many nuclei; however, significant discrepancies of up to 600% are observed, particularly for isotopes of Sn and Mo. This indicates that these models significantly overestimate the standard 1 fission mode and suggests that spherical shell effects in the nascent fission fragments are less important for low-energy fastneutron-induced fission than for thermal neutron-induced fission. This has consequences for understanding and modeling the fission process, for experimental nuclear structure studies of the most neutron-rich nuclei, for future energy applications (e.g., Generation IV reactors which use fast-neutron spectra), and for the reactor antineutrino anomaly.

Published
2017

125. Low-spin structure of $^{86}_{35}$Br$_{51}$ and $^{86}_{36}$Kr$_{50}$ nuclei: The role of the g $_{7/2}$ neutron orbital

Author

Urban, W., Sieja, K., Materna, T., Czerwinski, M., Rzaca-Urban, T., Blanc, A., Jentschel, M., Mutti, P., Köster, U., Soldner, T., de France, G., Simpson, G. S., Ur, C., Bernards, C., Fransen, C., Jolie, J., Regis, J.-M., Thomas, T., Warr, N., Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Laue-Langevin (ILL), ILL, 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 Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

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

International audience; Low-spin excited levels in Br513586 and Kr503686, populated following β− decay and the neutron-induced fission of U235, were measured using the Lohengrin fission-fragment separator and the EXILL array of Ge detectors at the PF1B cold-neutron facility of the Institute Laue-Langevin Grenoble. Improved populations of excited levels in Br86 remove inconsistencies existing in the literature on this nucleus. Directional-linear-polarization correlations, analyzed using newly developed formulas, as well as precise angular correlations allowed the unique 1− and 2− spin and parity assignments to the ground state of Br86 and the 4016.3-keV level in Kr86, respectively. Based on these results we propose that the Gamow-Teller β− decays of Se86 and Br86 involve the νg7/2→πg9/2 transition in addition to the νp3/2→πp3/2 transition proposed earlier. In Kr86 we have identified 1+1, 2+3, and 3+1 levels, analogous to the mixed-symmetry states in Mo94, which in Kr86 are from proton excitations, only. Large-scale, shell-model calculations with refined interactions reproduce well excitations in Br86 and Kr86 and support our interpretations.

Published
2016
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126. Nuclear spins and magnetic moments of 71,73,75Cu: inversion of pi2p3/2 and pi1f5/2 levels in 75Cu

Author

Flanagan, K, Vingerhoets, P, Avgoulea, M, Billowes, J, Bissell, M, Blaum, K, Cheal, B, De Rydt, M, Fedosseev, V, Forest, D, Geppert, C, Köster, U, Kowalska, M, Krämer, J, Kratz, K, Krieger, A, Mané, E, Marsh, B, Materna, T, Mathieu, L, Molkanov, P, Neugart, R, Neyens, G, Nörtershäuser, W, and Seliverstov, MD

Abstract

We report the first confirmation of the predicted inversion between the pi2p3/2 and pi1f5/2 nuclear states in the nu(g)9/2 midshell. This was achieved at the ISOLDE facility, by using a combination of in-source laser spectroscopy and collinear laser spectroscopy on the ground states of 71,73,75Cu, which measured the nuclear spin and magnetic moments. The obtained values are mu(71Cu)=+2.2747(8)mu(N), mu(73Cu)=+1.7426(8)mu(N), and mu(75Cu)=+1.0062(13)mu(N) corresponding to spins I=3/2 for 71,73Cu and I=5/2 for 75Cu. The results are in fair agreement with large-scale shell-model calculations.

Published
2016

127. In-source laser spectroscopy of Cu-75,Cu-77,Cu-78: Direct evidence for a change in the quasiparticle energy sequence in Cu-75,Cu-77 and an absence of longer-lived isomers in Cu-78

Author

Koester, U, Stone, NJ, Flanagan, KT, Stone, JR, Fedosseev, VN, Kratz, KL, Marsh, BA, Materna, T, Mathieu, L, Molkanov, PL, Seliverstov, MD, Serot, O, Sjodin, AM, and Volkov, YM

Abstract

This paper describes measurements on the isotopes 75,77,78Cu by the technique of in-source laser spectroscopy, at the ISOLDE facility, CERN. The role of this technique is briefly discussed in the context of this and other, higher resolution, methods applied to copper isotopes in the range 57-78Cu. The data, analyzed in comparison with previous results on the lighter isotopes 59,63Cu, establish the ground-state nuclear spin of 75,77Cu as 5/2 and yield their magnetic dipole moments as +1.01(5)μN and +1.61(5)μN, respectively. The results on 78Cu show no evidence for long-lived isomerism at this mass number and are consistent with a spin in the range 3-6 and moment of 0.0(4) μN. ©2011 American Physical Society.

Published
2016

128. Nuclear spins and magnetic moments of Cu71,73,75: Inversion of π2p3/2 and π1f5/2 Levels in Cu75

Author

Flanagan, K, Vingerhoets, P, Avgoulea, M, Billowes, J, Bissell, M, Blaum, K, Cheal, B, De Rydt, M, Fedosseev, V, Forest, D, Geppert, C, Köster, U, Kowalska, M, Krämer, J, Kratz, K, Krieger, A, Mané, E, Marsh, B, Materna, T, Mathieu, L, Molkanov, P, Neugart, R, Neyens, G, Nörtershäuser, W, and Seliverstov, MD

Abstract

We report the first confirmation of the predicted inversion between the π2p3/2 and π1f5/2 nuclear states in the νg9/2 midshell. This was achieved at the ISOLDE facility, by using a combination of in-source laser spectroscopy and collinear laser spectroscopy on the ground states of Cu71,73,75, which measured the nuclear spin and magnetic moments. The obtained values are μ(Cu71)=+2.2747(8)μN, μ(Cu73)=+1.7426(8)μN, and μ(Cu75)=+1.0062(13)μN corresponding to spins I=3/2 for Cu71,73 and I=5/2 for Cu75. The results are in fair agreement with large-scale shell-model calculations. © 2009 The American Physical Society.

Published
2016

129. Études des rendements de la fission induite par neutron du 239Pu et 241Pu avec le spectromètre LOHENGRIN

Author

Julien-Laferrière, S., Kessedjian, G., Serot, Olivier, Sage, C., Bernard , D., Chebboubi, A., Litaize, O., Terranova, N., Blanc, A., Faust, H., Köster, U., Mutti, P., Letourneau, A., Materna, T., Panebianco, S., Rapala, M., Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut Laue-Langevin (ILL), ILL, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and Vernay, Emmanuelle

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

National audience

Published
2016

130. The Neutrons for Science Facility at SPIRAL-2

Author

Ledoux, X, primary, Aïche, M, additional, Avrigeanu, M, additional, Avrigeanu, V, additional, Balanzat, E, additional, Ban-d’Etat, B, additional, Ban, G, additional, Bauge, E, additional, Bélier, G, additional, Bém, P, additional, Borcea, C, additional, Caillaud, T, additional, Chatillon, A, additional, Czajkowski, S, additional, Dessagne, P, additional, Doré, D, additional, Fischer, U, additional, Frégeau, M O, additional, Grinyer, J, additional, Guillous, S, additional, Gunsing, F, additional, Gustavsson, C, additional, Henning, G, additional, Jacquot, B, additional, Jansson, K, additional, Jurado, B, additional, Kerveno, M, additional, Klix, A, additional, Landoas, O, additional, Lecolley, F R, additional, Lecouey, J L, additional, Majerle, M, additional, Marie, N, additional, Materna, T, additional, Mrázek, J, additional, Novák, J, additional, Oberstedt, S, additional, Oberstedt, A, additional, Panebianco, S, additional, Perrot, L, additional, Plompen, A J M, additional, Pomp, S, additional, Prokofiev, A V, additional, Ramillon, J M, additional, Farget, F, additional, Ridikas, D, additional, Rossé, B, additional, Serot, O, additional, Simakov, S P, additional, Šimečková, E, additional, Stanoiu, M, additional, Štefánik, M, additional, Sublet, J C, additional, Taïeb, J, additional, Tarrío, D, additional, Tassan-Got, L, additional, Thfoin, I, additional, and Varignon, C, additional

Published
2017
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131. Shape coexistence in the odd-odd nucleus Y98 : The role of the g9/2 neutron extruder

Author

Urban, W., primary, Czerwiński, M., additional, Kurpeta, J., additional, Rząca-Urban, T., additional, Wiśniewski, J., additional, Materna, T., additional, Iskra, Ł. W., additional, Smith, A. G., additional, Ahmad, I., additional, Blanc, A., additional, Faust, H., additional, Köster, U., additional, Jentschel, M., additional, Mutti, P., additional, Soldner, T., additional, Simpson, G. S., additional, Pinston, J. A., additional, de France, G., additional, Ur, C. A., additional, Elomaa, V.-V., additional, Eronen, T., additional, Hakala, J., additional, Jokinen, A., additional, Kankainen, A., additional, Moore, I. D., additional, Rissanen, J., additional, Saastamoinen, A., additional, Szerypo, J., additional, Weber, C., additional, and Äystö, J., additional

Published
2017
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133. Fission fragment yield distribution in the heavy-mass region from the Pu239 ( nth,f ) reaction

Author

Gupta, Y. K., primary, Biswas, D. C., additional, Serot, O., additional, Bernard, D., additional, Litaize, O., additional, Julien-Laferrière, S., additional, Chebboubi, A., additional, Kessedjian, G., additional, Sage, C., additional, Blanc, A., additional, Faust, H., additional, Köster, U., additional, Ebran, A., additional, Mathieu, L., additional, Letourneau, A., additional, Materna, T., additional, and Panebianco, S., additional

Published
2017
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134. Anomalies in the Charge Yields of Fission Fragments from the U(n,f)238 Reaction

Author

Wilson, J. N., primary, Lebois, M., additional, Qi, L., additional, Amador-Celdran, P., additional, Bleuel, D., additional, Briz, J. A., additional, Carroll, R., additional, Catford, W., additional, De Witte, H., additional, Doherty, D. T., additional, Eloirdi, R., additional, Georgiev, G., additional, Gottardo, A., additional, Goasduff, A., additional, Hadyńska-Klęk, K., additional, Hauschild, K., additional, Hess, H., additional, Ingeberg, V., additional, Konstantinopoulos, T., additional, Ljungvall, J., additional, Lopez-Martens, A., additional, Lorusso, G., additional, Lozeva, R., additional, Lutter, R., additional, Marini, P., additional, Matea, I., additional, Materna, T., additional, Mathieu, L., additional, Oberstedt, A., additional, Oberstedt, S., additional, Panebianco, S., additional, Podolyák, Zs., additional, Porta, A., additional, Regan, P. H., additional, Reiter, P., additional, Rezynkina, K., additional, Rose, S. J., additional, Sahin, E., additional, Seidlitz, M., additional, Serot, O., additional, Shearman, R., additional, Siebeck, B., additional, Siem, S., additional, Smith, A. G., additional, Tveten, G. M., additional, Verney, D., additional, Warr, N., additional, Zeiser, F., additional, and Zielinska, M., additional

Published
2017
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135. Chemical potential and symmetry energy for intermediate-mass fragment production in heavy ion reactions near the Fermi energy

Author

Liu, X., primary, Lin, W., additional, Huang, M., additional, Wada, R., additional, Wang, J., additional, Bonasera, A., additional, Zheng, H., additional, Chen, Z., additional, Kowalski, S., additional, Keutgen, T., additional, Hagel, K., additional, Qin, L., additional, Natowitz, J. B., additional, Materna, T., additional, Sahu, P. K., additional, Barbui, M., additional, Bottosso, C., additional, and Rodrigues, M. R. D., additional

Published
2017
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136. Erratum: Novel determination of density, temperature, and symmetry energy for nuclear multifragmentation through primary fragment-yield reconstruction [Phys. Rev. C 89 , 021601(R) (2014)]

Author

Lin, W., primary, Liu, X., additional, Rodrigues, M. R. D., additional, Kowalski, S., additional, Wada, R., additional, Huang, M., additional, Zhang, S., additional, Chen, Z., additional, Wang, J., additional, Xiao, G. Q., additional, Han, R., additional, Jin, Z., additional, Liu, J., additional, Shi, F., additional, Keutgen, T., additional, Hagel, K., additional, Barbui, M., additional, Bottosso, C., additional, Bonasera, A., additional, Natowitz, J. B., additional, Kim, E. J., additional, Materna, T., additional, Qin, L., additional, Sahu, P. K., additional, Schmidt, K. J., additional, Wuenschel, S., additional, and Zheng, H., additional

Published
2017
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137. Production and Study of Neutron-rich Nuclei Using the LICORNE Directional Neutron Source

Author

Wilson, J.N., primary, Lebois, M., additional, Qi, L., additional, Amador-Celdran, P., additional, Bleuel, D., additional, Briz, J.A., additional, Carroll, R., additional, Catford, W., additional, De Witte, H., additional, Doherty, D., additional, Eloirdi, R., additional, Georgiev, G., additional, Gottardo, A., additional, Goasduff, A., additional, Hadynska-Klek, K., additional, Hauschild, K., additional, Hess, M., additional, Ingeberg, V., additional, Konstantinopoulos, T., additional, Ljungvall, J., additional, Lopez-Martens, A., additional, Lorusso, G., additional, Lozeva, R., additional, Lutter, R., additional, Marini, P., additional, Matea, I., additional, Materna, T., additional, Mathieu, L., additional, Oberstedt, A., additional, Oberstedt, S., additional, Panebianco, S., additional, Podolyak, Z., additional, Porta, A., additional, Regan, P.H., additional, Reiter, P., additional, Rezynkina, K., additional, Rose, S.J., additional, Sahin, E., additional, Seidlitz, M., additional, Shearman, R., additional, Siebeck, B., additional, Siem, S., additional, Smith, A.G., additional, Tveten, G.M., additional, Verney, D., additional, Warr, N., additional, Zeiser, F., additional, and Zielinska, M., additional

Published
2017
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138. Achievable precisions with the Lohengrin spectrometer: 233U(n,f), 239,241Pu(n,f)

Author

Abdelaziz Chebboubi, Kessedjian, G., Julien-Laferrière, S., Sage, C., Méplan, O., Faust, H., Köster, U., Blanc, A., Mutti, P., Olivier Serot, Litaize, O., Bernard, D., Letourneau, A., Materna, T., Rapala, M., Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), ILL, CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Vernay, Emmanuelle, and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)

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

International audience

Published
2015

139. Low spin structure of Se 86 : Confirmation of γ collectivity at N = 52

Author

Materna, T., Urban, W., Sieja, K., Köster, U., Faust, H., Czerwiński, M., Rząca-Urban, T., Bernards, C., Fransen, C., Jolie, J., Regis, J.-M., Thomas, T., Warr, N., Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)

Subjects
[PHYS]Physics [physics], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015
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140. Development of an isobaric beam at ILL for fission and decay heat measurements

Author

Abdelaziz Chebboubi, Kessedjian, G., Sage, C., Faust, H., Köster, U., Blanc, A., Mutti, P., Olivier Serot, Materna, T., Vernay, Emmanuelle, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), ILL, CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)

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

International audience

Published
2015

141. Isotopic distribution and dependency to fission product kinetic energy for 241Pu thermal neutron-induced fission.

Author

Köster, U., Julien-Laferrière, S., Kessedjian, G., Serot, O., Chebboubi, A., Bernard, D., Blanc, A., Litaize, O., Materna, T., Meplan, O., Rapala, M., and Sage, C.

Subjects
NUCLEAR fission, THERMAL neutrons, KINETIC energy, MASS spectrometry, ANALYSIS of covariance
Abstract

Nuclear fission yields data measurements for thermal neutron induced fission of 241Pu have been carried out at the ILL in Grenoble, using the Lohengrin mass spectrometer. The relative isotopic yields for the masses 137 up to 141 have been derived with the associated experimental covariance matrices. Moreover, from preliminary results for the masses 92, 138 and 139, a clear evolution over fission product kinetic energy of the isotopic total count rate is observed. [ABSTRACT FROM AUTHOR]

Published
2018

142. Lifetime of the () state in 135Te.

Author

Simpson, G, Regis, J M, Bettermann, L, Genevey, J, Jolie, J, Köster, U, Materna, T, Malkiewicz, T, Muraz, J-F, Pinston, J A, Roussiere, B, and Thiamova, G

Subjects
SCINTILLATORS, MASS spectrometers, NEUTRONS, SPECTROMETERS, PROTONS, IONS, TELLURIUM
Abstract

The lifetime of the state of 135Te has been measured to be τ = 809(22) ps, corresponding to a reduced transition rate of =6.6(2) W.u. The experiment was performed at the focal point of the Lohengrin spectrometer and μs-delayed γ rays from mass-selected A = 135 ions were detected by four LaBr3(Ce) scintillators. This allowed the fast-timing technique to be used to access lifetimes in the 10s-of-ps to ns time region. The value is typical of a vibrational transition, despite 135Te possessing only one valence neutron and two valence protons. Shell model calculations performed with the state-of-the-art effective interaction predict a B(E2) value close to the experimental one and show that contributions from the π(g7/2, d5/2)νf7/2 couplings are coherent. [ABSTRACT FROM AUTHOR]

Published
2019
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143. The Neutrons for Science Facility at SPIRAL-2

Author

Ledoux, X., Aïche, M., Avrigeanu, M., Avrigeanu, V., Audouin, L., Balanzat, E., Ban-détat, B., Ban, G., Barreau, G., Bauge, E., Bélier, G., Bem, P., Blideanu, V., Borcea, C., Bouffard, S., Caillaud, T., Chatillon, A., Czajkowski, S., Dessagne, P., Doré, D., Fallot, M., Farget, F., Fischer, U., Giot, L., Granier, T., Guillous, S., Gunsing, F., Gustavsson, C., Jacquot, B., Jansson, K., Jurado, B., Kerveno, M., Klix, A., Landoas, O., Lecolley, F.R., Lecouey, J.L., Majerle, M., Marie, N., Materna, T., Mrazek, J., Negoita, F., Novak, J., Oberstedt, S., Oberstedt, A., Panebianco, S., Perrot, L., Plompen, A.J.M., Pomp, S., Ramillon, J.M., Ridikas, D., Rossé, B., Rudolf, G., Serot, O., Simakov, S.P., Simeckova, E., Smith, A.G., Sublet, J.C., Taieb, J., Tassan-Got, L., Tarrio, D., Takibayev, A., Thfoin, I., Tsekhanovich, I., and Varignon, C.

Published
2014
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147. Low-spin structure of Br-86(35)51 and Kr-86(36)50 nuclei: The role of the g(7/2) neutron orbital

Author

Urban, W., Sieja, K., Materna, T., Czerwinski, M., Rzaca-Urban, T., Blanc, A., Jentschel, M., Mutti, P., Koster, U., Soldner, T., de France, G., Simpson, G. S., Ur, C. A., Bernards, C., Fransen, C., Jolie, J., Regis, J. -M., Thomas, T., Warr, N., Urban, W., Sieja, K., Materna, T., Czerwinski, M., Rzaca-Urban, T., Blanc, A., Jentschel, M., Mutti, P., Koster, U., Soldner, T., de France, G., Simpson, G. S., Ur, C. A., Bernards, C., Fransen, C., Jolie, J., Regis, J. -M., Thomas, T., and Warr, N.

Abstract

Low-spin excited levels in Br-86(35)51 and Kr-86(36)50, populated following beta(-) decay and the neutron-induced fission of U-235, were measured using the Lohengrin fission-fragment separator and the EXILL array of Ge detectors at the PF1B cold-neutron facility of the Institute Laue-Langevin Grenoble. Improved populations of excited levels in Br-86 remove inconsistencies existing in the literature on this nucleus. Directional-linear-polarization correlations, analyzed using newly developed formulas, as well as precise angular correlations allowed the unique 1(-) and 2(-) spin and parity assignments to the ground state of Br-86 and the 4016.3-keV level in Kr-86, respectively. Based on these results we propose that the Gamow-Teller beta(-) decays of Se-86 and Br-86 involve the nu g(7/2) -> pi g(9/2) transition in addition to the nu p(3/2) -> pi p(3/2) transition proposed earlier. In Kr-86 we have identified 1(1)(+), 2(3)(+), and 3(1)(+) levels, analogous to the mixed- symmetry states in Mo-94, which in Kr-86 are from proton excitations, only. Large-scale, shell-model calculations with refined interactions reproduce well excitations in Br-86 and Kr-86 and support our interpretations.

Published
2016

148. Low-spin structure of Br513586 and Kr503686 nuclei: The role of the g7/2 neutron orbital

Author

Urban, W., primary, Sieja, K., additional, Materna, T., additional, Czerwiński, M., additional, Rząca-Urban, T., additional, Blanc, A., additional, Jentschel, M., additional, Mutti, P., additional, Köster, U., additional, Soldner, T., additional, de France, G., additional, Simpson, G. S., additional, Ur, C. A., additional, Bernards, C., additional, Fransen, C., additional, Jolie, J., additional, Regis, J.-M., additional, Thomas, T., additional, and Warr, N., additional

Published
2016
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149. Low spin structure of Se-86: Confirmation of gamma collectivity at N=52

Author

Materna, T., Urban, W., Sieja, K., Koester, U., Faust, H., Czerwinski, M., Rzaca-Urban, T., Bernards, C., Fransen, C., Jolie, J., Regis, J-M, Thomas, T., Warr, N., Materna, T., Urban, W., Sieja, K., Koester, U., Faust, H., Czerwinski, M., Rzaca-Urban, T., Bernards, C., Fransen, C., Jolie, J., Regis, J-M, Thomas, T., and Warr, N.

Abstract

The Se-86 nucleus has been investigated by gamma-ray spectroscopy using an array of Ge detectors placed at the exit of the fission-fragment mass separator Lohengrin of the Institut Laue-Langevin. New transitions have been identified by studying the beta decay of As-86. An excitation scheme is proposed and includes a 2(2)(+) level at 1399 keV and a possible 3(+) level that are well reproduced by shell model calculations with the most recent parametrization. The properties of the excitations indicate a possible onset of gamma collectivity in Se-86.

Published
2015

150. Development of a Gas Filled Magnet spectrometer for the measurement of fission yields at LOHENGRIN

Author

Abdelaziz Chebboubi, Kessedjian, G., Sage, C., Meplan, O., Faust, H., Köster, U., Blanc, A., Mutti, P., Olivier Serot, Materna, T., Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), ILL, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Vernay, Emmanuelle, and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2013

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