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1. Measurement of the neutron-induced fission cross section of Th 230 at the CERN n_TOF facility

Author

Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Michalopoulou, Veatriki, Stamatopoulos, A., Diakaki, Maria, Tsinganis, Andrea, Vlastou, Roza, Kokkoris, M., Patronis, N., Eleme, Zinovia, Macina, Daniela, Tassan Got, Laurence, Colonna, Nicola, Chiaveri, E., Ventura, Alberto, Calviño Tavares, Francisco, Casanovas Hoste, Adrià, Cortés Rossell, Guillem Pere, Tarifeño Saldivia, Ariel Esteban, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Michalopoulou, Veatriki, Stamatopoulos, A., Diakaki, Maria, Tsinganis, Andrea, Vlastou, Roza, Kokkoris, M., Patronis, N., Eleme, Zinovia, Macina, Daniela, Tassan Got, Laurence, Colonna, Nicola, Chiaveri, E., Ventura, Alberto, Calviño Tavares, Francisco, Casanovas Hoste, Adrià, Cortés Rossell, Guillem Pere, and Tarifeño Saldivia, Ariel Esteban

Abstract

The neutron-induced fission cross section of 230 Th has been measured at the neutron time-of-flight facility n_TOF located at CERN. The experiment was performed at the experimental area EAR-1 with a neutron flight path of 185 m, using Micromegas detectors for the detection of the fission fragments. The 230 Th(n, f ) cross section was determined relative to the 235 U(n, f ) one, covering the energy range from the fission threshold up to 400 MeV. The results from the present work are compared with existing cross-section datasets and the observed discrepancies are discussed and analyzed. Finally, using the code EMPIRE 3.2.3 a theoretical study, based on the statistical model, was performed leading to a satisfactory reproduction of the experimental results with the proper tuning of the respective parameters, while for incident neutron energy beyond 200 MeV the fission of 230 Th was described by Monte Carlo simulations., This project received funding from the Euratom “Support safe operation of nuclear systems” program 2014–2018 under Grant Agreement No. 847552 (SANDA) and by the funding agencies of the participating institutes. This research is imple- mented through the IKY scholarships program and cofinanced by the European Union (European Social Fund ’ESF) and Greek national funds through the action entitled “Reinforce- ment of Postdoctoral Researchers - 2nd call (MIS 5033021)”, in the framework of the Operational Programme “Human Resources Development Program, Education and Lifelong Learning” of the National Strategic Reference Framework., Article signat per 137 autors/es: V. Michalopoulou, A. Stamatopoulos, M. Diakaki, A. Tsinganis, R. Vlastou, M. Kokkoris, N. Patronis, Z. Eleme, D. Macina, L. Tassan-Got, N. Colonna, E. Chiaveri, A. Ventura, P. Schillebeeckx, J. Heyse, G. Sibbens, G. Alaerts, A. Borella, A. Moens, D. Vanleeuw, O. Aberle, V. Alcayne, S. Amaducci, J. Andrzejewski, L. Audouin, V. Babiano-Suarez, M. Bacak, M. Barbagallo, S. Bennett, E. Berthoumieux, J. Billowes, D. Bosnar, A. Brown, M. Busso, M. Caamaño, L. Caballero, F. Calviño, M. Calviani, D. Cano-Ott, A. Casanovas, F. Cerutti, G. Cortés, M. A. Cortés-Giraldo, L. Cosentino, S. Cristallo, L. A. Damone, P. J. Davies, M. Dietz, C. Domingo-Pardo, R. Dressler, Q. Ducasse, E. Dupont, I. Durán, B. Fernández-Domínguez, A. Ferrari, P. Finocchiaro, V. Furman, K. Göbel, R. Garg, A. Gawlik-Ramiega, S. Gilardoni, I. F. Gonçalves, E. González-Romero, C. Guerrero, F. Gunsing, H. Harada, S. Heinitz, D. G. Jenkins, A. Junghans, F. Käppeler, Y. Kadi, A. Kimura, I. Knapová, Y. Kopatch, M. Krticka, D. Kurtulgil, I. Ladarescu, C. Lederer-Woods, H. Leeb, J. Lerendegui-Marco, S. J. Lonsdale, A. Manna, T. Martínez, A. Masi, C. Massimi, P. Mastinu, M. Mastromarco, E. A. Maugeri, A. Mazzone, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, J. Moreno-Soto, A. Musumarra, A. Negret, R. Nolte, F. Ogállar, A. Oprea, A. Pavlik, J. Perkowski, C. Petrone, L. Piersanti, E. Pirovano, I. Porras, J. Praena, J. M. Quesada, D. Ramos-Doval, T. Rauscher, R. Reifarth, D. Rochman, Y. Romanets, C. Rubbia, M. Sabaté-Gilarte, A. Saxena, D. Schumann, A. Sekhar, A. G. Smith, N. V. Sosnin, P. Sprung, G. Tagliente, J. L. Tain, A. Tarifeño-Saldivia, Th. Thomas, P. Torres-Sánchez, J. Ulrich, S. Urlass, S. Valenta, G. Vannini, V. Variale, P. Vaz, D. Vescovi, V. Vlachoudis, A. Wallner, P. J. Woods, T. Wright, and P. Žugec., Postprint (published version)

Published
2023

2. Neutron-induced fission cross sections of Th 232 and U 233 up to 1 GeV using parallel plate avalanche counters at the CERN n_TOF facility

Author

Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Tarrío, Diego, Tassan Got, Laurence, Durán, I., Leong, L.S., Paradela Dobarro, Carlos, Audouin, Ludmila, Leal-Cidoncha, E., Le Naour, Claire, Caamaño Fresco, Manuel, Ventura, Alberto, Altstadt, Sebastian, Andrzejewski, Józef, Barbagallo, Massimo, Bécares, Vicente, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Riego Pérez, Albert, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Tarrío, Diego, Tassan Got, Laurence, Durán, I., Leong, L.S., Paradela Dobarro, Carlos, Audouin, Ludmila, Leal-Cidoncha, E., Le Naour, Claire, Caamaño Fresco, Manuel, Ventura, Alberto, Altstadt, Sebastian, Andrzejewski, Józef, Barbagallo, Massimo, Bécares, Vicente, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, and Riego Pérez, Albert

Abstract

The neutron-induced fission cross sections of 232 Th and 233 U were measured relative to 235 U in a wide neutron energy range up to 1 GeV (and from fission threshold in the case of 232 Th , and from 0.7 eV in case of 233 U ), using the white-spectrum neutron source at the CERN Neutron Time-of-Flight (n_TOF) facility. Parallel plate avalanche counters (PPACs) were used, installed at the Experimental Area 1 (EAR1), which is located at 185 m from the neutron spallation target. The anisotropic emission of fission fragments were taken into account in the detection efficiency by using, in the case of 233 U , previous results available in EXFOR, whereas in the case of 232 Th these data were obtained from our measurement, using PPACs and targets tilted 45 ° with respect to the neutron beam direction. Finally, the obtained results are compared with past measurements and major evaluated nuclear data libraries. Calculations using the high-energy reaction models INCL + + and ABLA07 were performed and some of their parameters were modified to reproduce the experimental results. At high energies, where no other neutron data exist, our results are compared with experimental data on proton-induced fission. Moreover, the dependence of the fission cross section at 1 GeV with the fissility parameter of the target nucleus is studied by combining those ( p , f ) data with our ( n , f ) data on 232 Th and 233 U and on other isotopes studied earlier at n_TOF using the same experimental setup., Peer Reviewed, Article escrit per 81 autors/autores: D. Tarrío , L. Tassan-Got, I. Duran, L. S. Leong, C. Paradela, L. Audouin, E. Leal-Cidoncha, C. Le Naour, M. Caamaño, A. Ventura, S. Altstadt, J. Andrzejewski, M. Barbagallo, V. Bécares, F. Becvá ˇ ˇr,F. Belloni, E. Berthoumieux, J. Billowes, V. Boccone, D. Bosnar, M. Brugger, M. Calviani, F. Calviño, D. Cano-Ott, C. Carrapiço, F. Cerutti, E. Chiaveri,M. Chin, N. Colonna, G. Cortés, M. A. Cortés-Giraldo, M. Diakaki, C. Domingo-Pardo, N. Dzysiuk, C. Eleftheriadis, A. Ferrari, K. Fraval, S. Ganesan, A. R. García, G. Giubrone, M. B. Gómez-Hornillos, I. F. Gonçalves, E. González-Romero,E. Griesmayer, C. Guerrero, F. Gunsing, P. Gurusamy, D. G. Jenkins, E. Jericha, Y. Kadi, F. Käppeler,† D. Karadimos, P. Koehler, M. Kokkoris, M. Krticka, J. Kroll, C. Langer, C. Lederer, H. Leeb, R. Losito, A. Manousos, J. Marganiec, T. Martínez, C. Massimi, P. F. Mastinu,M. Mastromarco, M. Meaze, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, M. Mirea,,† W. Mondalaers, A. Pavlik, J. Perkowski, A. Plompen, J. Praena, J. M. Quesada, T. Rauscher, R. Reifarth, A. Riego, M. S. Robles, F. Roman, C. Rubbia, R. Sarmento, P. Schillebeeckx,S. Schmidt, G. Tagliente, J. L. Tain, A. Tsinganis, S. Valenta, G. Vannini, V. Variale, P. Vaz, R. Versaci, M. J. Vermeulen, V. Vlachoudis, R. Vlastou,A. Wallner, T. Ware, M. Weigand, C. Weiß, T. J. Wright, P. Žugec, Postprint (published version)

Published
2023

3. Multiscale modelling for fusion and fission materials: the M4F project

Author

M. Sauzay, F. Jiménez, Igor Simonovski, Chu-Chun Fu, P.-W. Ma, Pär Olsson, H. Namburi, G. Bonny, M. Prester, O. Libera, Francesca Boioli, L. Gélébart, Fernando Mota, Philippe Spätig, M.J. Konstantinović, D. Tanguy, Ermile Gaganidze, Mihai-Cosmin Marinica, C. Pareige, N. Kvashin, Karin Vogel, C. Guerrero, Susana Merino, C. Kaden, E. Meslin, M. Hernández-Mayoral, Qamar Hayat, Max Boleininger, L. Kurpaska, Gonzalo de Diego, R.R. Rajakrishnan, M. Clozel, S. Austin, C. Robertson, N. Anento, Lorenzo Malerba, Frédéric Mompiou, Anna Serra, Jarir Aktaa, C.J. Ortiz, P.M. Gueye, Alexander Bakaev, A. Kraych, Jacob B. J. Chapman, Jacek Jagielski, J. Zhao, Benoit Devincre, Dorival Gonçalves, T. Manninen, Ana Ruiz-Moreno, M. Vallet, Michal Trebala, J.P. Balbuena, N. Castin, P. Chekhonin, Frank Bergner, Mickaël Trochet, David Rodney, B. Gómez-Ferrer, Peter Hähner, Nigel M. Jennett, Sergei L. Dudarev, F. Soisson, R. Gatti, M.J. Caturla, A. Ulbricht, G. Kapoor, Tuncay Yalçinkaya, D. Terentyev, Marta Serrano, A. Kuronen, Tymofii Khvan, Simo-Pekka Hannula, L. Dupuy, Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental, Universitat Politècnica de Catalunya. Doctorat en Física Computacional i Aplicada, Centro de Investigaciones Energéticas Medioambientales y Tecnológicas [Madrid] (CIEMAT), Universidad de Alicante, Karlsruher Institut für Technologie (KIT), Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Centre d'Etude de l'Energie Nucléaire (SCK-CEN), Royal Institute of Technology [Stockholm] (KTH ), CEA- Saclay (CEA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Modélisation de la matière condensée et des interfaces (MMCI), Institut Lumière Matière [Villeurbanne] (ILM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), European Commission - Joint Research Centre [Petten], Universitat Politècnica de Catalunya [Barcelona] (UPC), LEM, UMR 104, CNRS-ONERA, Université Paris-Saclay (Laboratoire d'étude des microstructures), ONERA-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), UK Atomic Energy Authority (UKAEA), Narodowe Centrum Badań Jądrowych (NCBJ), Groupe de physique des matériaux (GPM), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU), Aalto University, Coventry University (UK), Coventry University, Université de Liège, Centre d'élaboration de matériaux et d'études structurales (CEMES), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT-FR 2599), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Paul Scherrer Institute (PSI), Middle East Technical University [Ankara] (METU), This work has received funding from the Euratom research and training programme 2014-2018 under grant agreement No. 755039 (M4F project)., Universidad de Alicante. Departamento de Física Aplicada, Grupo de Nanofísica, Física de la Materia Condensada, Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Helsingin yliopisto = Helsingfors universitet = University of Helsinki, Centrum výzkumu Řež, Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), CIEMAT, University of Alicante, Karlsruhe Institute of Technology, Helmholtz-Zentrum Dresden-Rossendorf, Belgian Nuclear Research Centre, KTH Royal Institute of Technology, Université Paris-Saclay, Centre National de la Recherche Scientifique (CNRS), European Commission Joint Research Centre Institute, BarcelonaTech, UK Atomic Energy Authority, National Centre for Nuclear Research, Université de Rouen, Department of Chemistry and Materials Science, University of Helsinki, Czech Academy of Sciences, Institut za Fiziku, Paul Scherrer Institute, Middle East Technical University, Aalto-yliopisto, Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), and OpenMETU

Subjects
Nuclear and High Energy Physics, Engineering, Fission, Materials Science (miscellaneous), 02 engineering and technology, 01 natural sciences, Fissió nuclear, Multiscale modelling, Física Aplicada, 0103 physical sciences, Fusió nuclear, Fusion, Training programme, QC, Engineering & allied operations, 010302 applied physics, Energies::Energia nuclear [Àrees temàtiques de la UPC], business.industry, TK9001-9401, Nuclear fission, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Nuclear Energy and Engineering, Work (electrical), TA, Systems engineering, Nuclear engineering. Atomic power, M4F project, Nuclear fusion, ddc:620, 0210 nano-technology, business, [CHIM.RADIO]Chemical Sciences/Radiochemistry
Abstract

The M4F project brings together the fusion and fission materials communities working on the prediction of radiation damage production and evolution and their effects on the mechanical behaviour of irradiated ferritic/martensitic (F/M) steels. It is a multidisciplinary project in which several different experimental and computational materials science tools are integrated to understand and model the complex phenomena associated with the formation and evolution of irradiation induced defects and their effects on the macroscopic behaviour of the target materials. In particular the project focuses on two specific aspects: (1) To develop physical understanding and predictive models of the origin and consequences of localised deformation under irradiation in F/M steels; (2) To develop good practices and possibly advance towards the definition of protocols for the use of ion irradiation as a tool to evaluate radiation effects on materials. Nineteen modelling codes across different scales are being used and developed and an experimental validation programme based on the examination of materials irradiated with neutrons and ions is being carried out. The project enters now its 4th year and is close to delivering high-quality results. This paper overviews the work performed so far within the project, highlighting its impact for fission and fusion materials science. Peer Reviewed L. Malerba a,*, M.J. Caturla b, E. Gaganidze c, C. Kaden d, M.J. Konstantinovi´c e, P. Olsson f, C. Robertson g, D. Rodney h, A.M. Ruiz-Moreno i, M. Serrano a, J. Aktaa c, N. Anento j, S. Austin i, A. Bakaev e, J.P. Balbuena b, F. Bergner d, F. Boioli k, M. Boleininger l, G. Bonny e, N. Castin e, J.B. J. Chapman l, P. Chekhonin d, M. Clozel m, B. Devincre k, L. Dupuy g, G. Diego a, S.L. Dudarev l, C.-C. Fu g, R. Gatti k, L. G´el´ebart g, B. G´omez-Ferrer n, D. Gonçalves g, C. Guerrero a, P.M. Gueye n, P. H¨ahner i, S.P. Hannula o, Q. Hayat p, M. Hern´andez-Mayoral a, J. Jagielski m, N. Jennett p, F. Jim´enez a, G. Kapoor d, A. Kraych h, T. Khvan e,q, L. Kurpaska m, A. Kuronen r, N. Kvashin j, O. Libera s, P.-W. Ma l, T. Manninen o, M.-C. Marinica g, S. Merino a, E. Meslin g, F. Mompiou t, F. Mota a, H. Namburi s, C.J. Ortiz a, C. Pareige n, M. Prester u, R.R. Rajakrishnan t, M. Sauzay g, A. Serra j, I. Simonovski i, F. Soisson g, P. Sp¨atig v, D. Tanguy h, D. Terentyev e, M. Trebala o, M. Trochet g, A. Ulbricht d, M.Vallet g, K. Vogel d, T. Yalcinkaya w, J. Zhao r a Centro de Investigaciones Energ´eticas, Medioambientales y Tecnol´ogicas (CIEMAT), Madrid, Spain b Universidad de Alicante, San Vicente del Raspeig, Spain c Karlsruher Institut für Technologie (KIT), Karlsruhe, Germany d Helmholtz-Zentrum Dresden-Rossendorf Ev (HZDR), Rossendorf, Germany e Studiecentrum voor Kernenergie / Centre d’´Etude de l’´Energie Nucl´eaire (SCK CEN), Mol, Belgium f KTH Royal Institute of Technology, Stockholm, Sweden g Universit´e Paris-Saclay, Commissariat `a l’´Energie Atomique et aux ´Energies Alternatives (CEA), Gif-sur-Yvette, France h Institut Lumi`ere Mati`ere (ILM), Centre National de la Recherche Scientifique, Lyon, France i Joint Research Centre (JRC)- European Commission, Petten, the Netherlands j Universitat Polit`ecnica de Catalunya, Barcelona, Spain k Laboratoire d’Etude des Microstructures (LEM), Centre National de la Recherche Scientifique, Chˆatillon, France l United Kingdom Atomic Energy Authority (UKAEA), Culham, UK m Narodowe Centrum Badan Jadrowych (NCBJ), Swierk, Poland n Normandie Univ, UNIROUEN, INSA Rouen, CNRS, Groupe de Physique des Mat´eriaux, 76000 Rouen, France o Aalto University, Espoo, Finland p Coventry University, UK q Universit´e de Li`ege, Belgium r Helsingin Yliopisto, Helsinki, Finland s Centrum Vyzkumu ˇReˇz S.R.O. (CVR), ˇReˇz, Czech Republic t Centre pour l’´Elaboration Elaboration de Mat´eriaux et pour l’´Etude des Structures (CEMES), Centre National de la Recherche Scientifique, Toulouse, France u Institut za Fiziku, Zagreb, Croatia v Paul Scherrer Institut (PSI), Villingen, Switzerland w Middle East Technical University (METU), Ankara, Turkey

Published
2021

4. Multiscale modelling for fusion and fission materials: the M4F project

Author

Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental, Universitat Politècnica de Catalunya. Doctorat en Física Computacional i Aplicada, Malerba, L., Caturla, Maria José, Gaganidze, Emile, Anento Moreno, Napoleón, Kvashin, Nikolai, Serra Tort, Ana María, Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental, Universitat Politècnica de Catalunya. Doctorat en Física Computacional i Aplicada, Malerba, L., Caturla, Maria José, Gaganidze, Emile, Anento Moreno, Napoleón, Kvashin, Nikolai, and Serra Tort, Ana María

Abstract

The M4F project brings together the fusion and fission materials communities working on the prediction of radiation damage production and evolution and their effects on the mechanical behaviour of irradiated ferritic/martensitic (F/M) steels. It is a multidisciplinary project in which several different experimental and computational materials science tools are integrated to understand and model the complex phenomena associated with the formation and evolution of irradiation induced defects and their effects on the macroscopic behaviour of the target materials. In particular the project focuses on two specific aspects: (1) To develop physical understanding and predictive models of the origin and consequences of localised deformation under irradiation in F/M steels; (2) To develop good practices and possibly advance towards the definition of protocols for the use of ion irradiation as a tool to evaluate radiation effects on materials. Nineteen modelling codes across different scales are being used and developed and an experimental validation programme based on the examination of materials irradiated with neutrons and ions is being carried out. The project enters now its 4th year and is close to delivering high-quality results. This paper overviews the work performed so far within the project, highlighting its impact for fission and fusion materials science., Peer Reviewed, L. Malerba a,*, M.J. Caturla b, E. Gaganidze c, C. Kaden d, M.J. Konstantinovi´c e, P. Olsson f, C. Robertson g, D. Rodney h, A.M. Ruiz-Moreno i, M. Serrano a, J. Aktaa c, N. Anento j, S. Austin i, A. Bakaev e, J.P. Balbuena b, F. Bergner d, F. Boioli k, M. Boleininger l, G. Bonny e, N. Castin e, J.B. J. Chapman l, P. Chekhonin d, M. Clozel m, B. Devincre k, L. Dupuy g, G. Diego a, S.L. Dudarev l, C.-C. Fu g, R. Gatti k, L. G´el´ebart g, B. G´omez-Ferrer n, D. Gonçalves g, C. Guerrero a, P.M. Gueye n, P. H¨ahner i, S.P. Hannula o, Q. Hayat p, M. Hern´andez-Mayoral a, J. Jagielski m, N. Jennett p, F. Jim´enez a, G. Kapoor d, A. Kraych h, T. Khvan e,q, L. Kurpaska m, A. Kuronen r, N. Kvashin j, O. Libera s, P.-W. Ma l, T. Manninen o, M.-C. Marinica g, S. Merino a, E. Meslin g, F. Mompiou t, F. Mota a, H. Namburi s, C.J. Ortiz a, C. Pareige n, M. Prester u, R.R. Rajakrishnan t, M. Sauzay g, A. Serra j, I. Simonovski i, F. Soisson g, P. Sp¨atig v, D. Tanguy h, D. Terentyev e, M. Trebala o, M. Trochet g, A. Ulbricht d, M.Vallet g, K. Vogel d, T. Yalcinkaya w, J. Zhao r a Centro de Investigaciones Energ´eticas, Medioambientales y Tecnol´ogicas (CIEMAT), Madrid, Spain b Universidad de Alicante, San Vicente del Raspeig, Spain c Karlsruher Institut für Technologie (KIT), Karlsruhe, Germany d Helmholtz-Zentrum Dresden-Rossendorf Ev (HZDR), Rossendorf, Germany e Studiecentrum voor Kernenergie / Centre d’´Etude de l’´Energie Nucl´eaire (SCK CEN), Mol, Belgium f KTH Royal Institute of Technology, Stockholm, Sweden g Universit´e Paris-Saclay, Commissariat `a l’´Energie Atomique et aux ´Energies Alternatives (CEA), Gif-sur-Yvette, France h Institut Lumi`ere Mati`ere (ILM), Centre National de la Recherche Scientifique, Lyon, France i Joint Research Centre (JRC)- European Commission, Petten, the Netherlands j Universitat Polit`ecnica de Catalunya, Barcelona, Spain k Laboratoire d’Etude des Microstructures (LEM), Centre National de la Recherche Scientifique, Chˆatillon, France l Unit, Postprint (published version)

Published
2021

5. Comportamiento de los productos de fisión en el combustible nuclear gastado: el caso del Molibdeno

Author

Universitat Politècnica de Catalunya. Departament d'Enginyeria Química, Giménez Izquierdo, Francisco Javier, Pablo Ribas, Joan de, Mateu Alcácer, Adriana, Universitat Politècnica de Catalunya. Departament d'Enginyeria Química, Giménez Izquierdo, Francisco Javier, Pablo Ribas, Joan de, and Mateu Alcácer, Adriana

Abstract

El principal problema de l’energia nuclear està relacionat amb la gestió dels residus radioactius, en particular, del combustible nuclear gastat (CNG). Degut a l’augment en la producció a les centrals nuclears d’energia elèctrica, es genera una major quantitat de residus que cal guardar en algun lloc. Per això mateix és necessari que el CNG s’emmagatzemi de manera segura; a Europa l’opció escollida és la construcció d’un magatzem geològic profund (AGP), en el qual s’aïllen i confinen els residus en formacions geològiques profundes basades en un sistema multibarrera que tenen com a objectiu assegurar que el temps de trànsit fins l’arribada a la biosfera de qualsevol radionúclid (RN) emmagatzemat que es pogués alliberar sigui suficientment llarg per evitar un gran impacte en l’ésser humà i el medi ambient (Astudillo Pastor & Empresa Nacional de Residuos Radiactivos (España), 2001). El problema que aquesta solució presenta es produeix en el cas de què la barrera falli i l’aigua subterrània arribi al CNG, provocant la seva dissolució i alhora l’alliberament dels radionúclids continguts en aquest. Per això es molt important conèixer quin és el comportament de cada RN present al CNG en el moment del seu alliberament. Aquest treball es centra en l’estudi de la localització i el comportament dels productes de fissió (PF) que es troben al CNG una vegada irradiat al reactor. En concret, s’ha dut a terme l’estudi de l’alliberació de quatre RN (U, Cs, Mo i Pu) en diferents tipus de combustible i de mostres. Els valors experimentals utilitzats en aquest treball han estat obtinguts d’altres estudis anteriors i s’han utilitzat per realitzar l’ajust dels valors experimentals d’urani mitjançant un model matemàtic semi-empíric anomenat SERNIM i per obtenir els paràmetres del model i així poder predir l’alliberació del cesi, el molibdè i el plutoni. S’han estudiat onze mostres amb diferents graus de cremat (Entre 42 MW·d/kgU i 60 MW·d/kgU), tipus de combustible (BWR i PWR), tipus de

Published
2020

6. Measurement of the a ratio and (n,¿) cross section of U 235 from 0.2 to 200 eV at n_TOF

Author

Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Balibrea-Correa, J., Mendoza, E., Cano Ott, Daniel, Capote Noy, Roberto, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Ludmila, Bécares, Vicente, Barbagallo, Massimo, Becvar, F., Belloni, Fabio, Berthoumieux, Eric, Billowes, J., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Balibrea-Correa, J., Mendoza, E., Cano Ott, Daniel, Capote Noy, Roberto, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Ludmila, Bécares, Vicente, Barbagallo, Massimo, Becvar, F., Belloni, Fabio, Berthoumieux, Eric, Billowes, J., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, and Gómez Hornillos, María Belén

Abstract

We measured the neutron capture-to-fission cross-section ratio (a ratio) and the capture cross section of 235U between 0.2 and 200 eV at the n_TOF facility at CERN. The simultaneous measurement of neutron-induced capture and fission rates was performed by means of the n_TOF BaF2 Total Absorption Calorimeter (TAC), used for detection of ¿ rays, in combination with a set of micromegas detectors used as fission tagging detectors. The energy dependence of the capture cross section was obtained with help of the 6 Li(n,t) standard reaction determining the n_TOF neutron fluence; the well-known integral of the 235U(n, f ) cross section between 7.8 and 11 eV was then used for its absolute normalization. The a ratio, obtained with slightly higher statistical fluctuations, was determined directly, without need for any reference cross section. To perform the analysis of this measurement we developed a new methodology to correct the experimentally observed effect that the probabilities of detecting a fission reaction in the TAC and the micromegas detectors are not independent. The results of this work have been used in a new evaluation of 235U performed within the scope of the Collaborative International Evaluated Library Organisation (CIELO) Project, and are consistent with the ENDF/B-VIII.0 and JEFF-3.3 capture cross sections below 4 eV and above 100 eV. However, the measured capture cross section is on average 10% larger between 4 and 100 eV, Postprint (published version)

Published
2020

7. Comportamiento de los productos de fisión en el combustible nuclear gastado: el caso del Molibdeno

Author

Mateu Alcácer, Adriana, Giménez Izquierdo, Francisco Javier, Pablo Ribas, Joan de, and Universitat Politècnica de Catalunya. Departament d'Enginyeria Química

Subjects
Molybdenum, Molibdè, Combustible nuclear gastado, Combustibles, Nuclear fission, molibdeno, residuos, Residus -- Emmagatzematge, uranio, Fuel, Residus radioactius, Fissió nuclear, Enginyeria química [Àrees temàtiques de la UPC], productos de fisión, Radioactive wastes
Abstract

El principal problema de l’energia nuclear està relacionat amb la gestió dels residus radioactius, en particular, del combustible nuclear gastat (CNG). Degut a l’augment en la producció a les centrals nuclears d’energia elèctrica, es genera una major quantitat de residus que cal guardar en algun lloc. Per això mateix és necessari que el CNG s’emmagatzemi de manera segura; a Europa l’opció escollida és la construcció d’un magatzem geològic profund (AGP), en el qual s’aïllen i confinen els residus en formacions geològiques profundes basades en un sistema multibarrera que tenen com a objectiu assegurar que el temps de trànsit fins l’arribada a la biosfera de qualsevol radionúclid (RN) emmagatzemat que es pogués alliberar sigui suficientment llarg per evitar un gran impacte en l’ésser humà i el medi ambient (Astudillo Pastor & Empresa Nacional de Residuos Radiactivos (España), 2001). El problema que aquesta solució presenta es produeix en el cas de què la barrera falli i l’aigua subterrània arribi al CNG, provocant la seva dissolució i alhora l’alliberament dels radionúclids continguts en aquest. Per això es molt important conèixer quin és el comportament de cada RN present al CNG en el moment del seu alliberament. Aquest treball es centra en l’estudi de la localització i el comportament dels productes de fissió (PF) que es troben al CNG una vegada irradiat al reactor. En concret, s’ha dut a terme l’estudi de l’alliberació de quatre RN (U, Cs, Mo i Pu) en diferents tipus de combustible i de mostres. Els valors experimentals utilitzats en aquest treball han estat obtinguts d’altres estudis anteriors i s’han utilitzat per realitzar l’ajust dels valors experimentals d’urani mitjançant un model matemàtic semi-empíric anomenat SERNIM i per obtenir els paràmetres del model i així poder predir l’alliberació del cesi, el molibdè i el plutoni. S’han estudiat onze mostres amb diferents graus de cremat (Entre 42 MW·d/kgU i 60 MW·d/kgU), tipus de combustible (BWR i PWR), tipus de mostra (en pols de la part interna i externa del CNG o en pastilla) i diferents tipus de lixiviant (BIC i aigües de ciment). Els resultats obtinguts pel cesi i el plutoni en mostres en pols s’adeqüen al que s’esperava, en canvi el molibdè presenta un comportament totalment diferent a l’esperat tot i que ja es tenia una idea de què això passaria i per això mateix es va triar aquest RN en concret, per comprovar-ho. Respecte als resultats de les mostres de pastilles senceres de combustible, tant pel cesi com pel molibdè s’arriba a la conclusió de què tots dos s’alliberen independentment de la matriu del combustible i en cap cas es té en compte l’urani durant l’alliberació d’aquests. El plutoni mostra el comportament que s’esperava excepte per les mostres HBU amb aigües de ciment com a lixiviant, en les quals és possible que es produeixi la precipitació de fases secundàries que no han sigut estudiades encara i que poden ser motiu de nous estudis degut a la importància d’aquest actínid al combustible.

Published
2020

8. Measurement of the a ratio and (n,¿) cross section of U 235 from 0.2 to 200 eV at n_TOF

Author

Balibrea-Correa, J., Mendoza, E., Cano Ott, Daniel, Capote Noy, Roberto, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Ludmila, Bécares, Vicente, Barbagallo, Massimo, Becvar, F., Belloni, Fabio, Berthoumieux, Eric, Billowes, J., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Universitat Politècnica de Catalunya. Departament de Física, and Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group

Subjects
Energies::Energia nuclear [Àrees temàtiques de la UPC], Física [Àrees temàtiques de la UPC], Nuclear physics, Nuclear fission, Física nuclear, Neutrons--Captura, Neutrons--Capture, Fissió nuclear
Abstract

We measured the neutron capture-to-fission cross-section ratio (a ratio) and the capture cross section of 235U between 0.2 and 200 eV at the n_TOF facility at CERN. The simultaneous measurement of neutron-induced capture and fission rates was performed by means of the n_TOF BaF2 Total Absorption Calorimeter (TAC), used for detection of ¿ rays, in combination with a set of micromegas detectors used as fission tagging detectors. The energy dependence of the capture cross section was obtained with help of the 6 Li(n,t) standard reaction determining the n_TOF neutron fluence; the well-known integral of the 235U(n, f ) cross section between 7.8 and 11 eV was then used for its absolute normalization. The a ratio, obtained with slightly higher statistical fluctuations, was determined directly, without need for any reference cross section. To perform the analysis of this measurement we developed a new methodology to correct the experimentally observed effect that the probabilities of detecting a fission reaction in the TAC and the micromegas detectors are not independent. The results of this work have been used in a new evaluation of 235U performed within the scope of the Collaborative International Evaluated Library Organisation (CIELO) Project, and are consistent with the ENDF/B-VIII.0 and JEFF-3.3 capture cross sections below 4 eV and above 100 eV. However, the measured capture cross section is on average 10% larger between 4 and 100 eV

Published
2020

9. Neutron-induced Fission Cross Section of 240,242Pu

Author

D. Vanleeuw, F.-J. Hambsch, P. Salvador-Castiñeira, R. Eykens, Stephan Oberstedt, Marzio Vidali, G. Sibbens, C. Pretel, Alf Göök, T. Bryś, Universitat Politècnica de Catalunya. Departament de Física, and Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group

Subjects
Ionization, Neutron detectors, Fission, 242Pu(n,f), f), Physics and Astronomy(all), 240Pu(n,f), Resonance (particle physics), Fissió nuclear, law.invention, Actinides, Nuclear physics, Cross section (physics), Isotopes, Neutron flux, law, Van de Graaff generator, Neutron, 238U(n,f), 242Pu(n, Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, 240Pu(n, Ionization chambers, Chemistry, Gamma rays, Nuclear energy, 237Np(n, Fast reactors, Ionization chamber, Energia nuclear, neutron-induced fission cross section, Neutron-induced fission, 237Np(n,f), Sensitivity analysis, 238U(n
Abstract

A sensitivity analysis for the new generation of fast reactors [Salvatores (2008)] has shown the importance of improved cross section data for several actinides. Among them, the240,242Pu(n,f) cross sections require an accuracy improvement to 1-3% and 3-5%, respectively, from the current level of 6% and 20%. At the Van de Graaff facility of the Institute for Reference Materials and Measurements (JRC-IRMM) the fission cross section of the two isotopes was measured relative to two secondary standard reactions,237Np(n,f) and238U(n,f), using a twin Frisch-grid ionization chamber. The secondary standard reactions were benchmarked through measurements against the primary standard reaction235U(n,f) in the same geometry. Sample masses were determined by means of low-geometry alpha counting or/and a 2p Frisch-grid ionization chamber, with an uncertainty lower than 2%. The neutron flux and the impact of scattering from material between source and target was examined, the largest effect having been found in cross section ratio measurements between a fissile and a fertile isotope. Our240,242Pu(n,f) cross sections are in agreement with previous experimental results and slightly lower than present evaluations. In case of the242Pu(n,f) reaction no evidence for a resonance at En=1.1 MeV was found.

Published
2015

10. Metodologia per incorporar la fusió nuclear dins d'una programació educativa de tecnologia

Author

Ferré Ferré, Lídia, Baeza Pérez, Eduard, Ferré Ferré, Lídia, and Baeza Pérez, Eduard

Abstract

L'objectiu principal és l'elaboració d'una metodologia que permeti, dins dels continguts de Generació d'electricitat de 2n d'ESO, que el alumnes interioritzin conceptes relacionats amb la fusió nuclear. Aquest tema gairebé no es tracta o sovint es fa en format de curiositat dins dels continguts d'electricitat. Per aquesta raó, és necessari generar una metodologia per incorporar la fusió nuclear dins d'una programació educativa de tecnologia i posar-la en pràctica amb un grup control i un grup d'experimentació. D'aquesta manera i amb un mecanisme d'obtenció de resultats adient, es podrà concloure si la metodologia emprada és o no una eina eficaç per tal d'ensenyar aquests conceptes a l'alumnat. Igual que la societat és conscient de què és la fissió, cal que coneguin què podria ser la fusió; no es pot oblidar que l'energia nuclear és un ampli camp d'anàlisi en el tractament d'estudis CTS (ciència, tecnologia i societat).

Published
2017

11. Metodologia per incorporar la fusió nuclear dins d'una programació educativa de tecnologia

Author

Baeza Pérez, Eduard and Ferré Ferré, Lídia

Subjects
Societat, Energy, Electricitat, Physics, Nuclear physics, Nuclear fission, Electrical power, Tecnologia -- Educació secundària obligatòria, Fissió nuclear, Education, Tecnologia, Ensenyament i aprenentatge::Ensenyament secundari [Àrees temàtiques de la UPC], Fusió nuclear, Nuclear fusion, Technology -- Study and teaching (Secondary), Energia, Física nuclear, Society, Educació, CTS
Abstract

L'objectiu principal és l'elaboració d'una metodologia que permeti, dins dels continguts de Generació d'electricitat de 2n d'ESO, que el alumnes interioritzin conceptes relacionats amb la fusió nuclear. Aquest tema gairebé no es tracta o sovint es fa en format de curiositat dins dels continguts d'electricitat. Per aquesta raó, és necessari generar una metodologia per incorporar la fusió nuclear dins d'una programació educativa de tecnologia i posar-la en pràctica amb un grup control i un grup d'experimentació. D'aquesta manera i amb un mecanisme d'obtenció de resultats adient, es podrà concloure si la metodologia emprada és o no una eina eficaç per tal d'ensenyar aquests conceptes a l'alumnat. Igual que la societat és conscient de què és la fissió, cal que coneguin què podria ser la fusió; no es pot oblidar que l'energia nuclear és un ampli camp d'anàlisi en el tractament d'estudis CTS (ciència, tecnologia i societat).

Published
2017

12. Metodologia per incorporar la fusió nuclear dins d'una programació educativa de tecnologia

Author

Baeza Pérez, Eduard|||0000-0002-2715-622X and Ferré Ferré, Lídia

Subjects
Societat, Energy, Electricitat, Physics, Nuclear physics, Nuclear fission, Electrical power, Tecnologia -- Educació secundària obligatòria, Fissió nuclear, Education, Tecnologia, Ensenyament i aprenentatge::Ensenyament secundari [Àrees temàtiques de la UPC], Fusió nuclear, Nuclear fusion, Technology -- Study and teaching (Secondary), Energia, Física nuclear, Society, Educació, CTS
Abstract

L'objectiu principal és l'elaboració d'una metodologia que permeti, dins dels continguts de Generació d'electricitat de 2n d'ESO, que el alumnes interioritzin conceptes relacionats amb la fusió nuclear. Aquest tema gairebé no es tracta o sovint es fa en format de curiositat dins dels continguts d'electricitat. Per aquesta raó, és necessari generar una metodologia per incorporar la fusió nuclear dins d'una programació educativa de tecnologia i posar-la en pràctica amb un grup control i un grup d'experimentació. D'aquesta manera i amb un mecanisme d'obtenció de resultats adient, es podrà concloure si la metodologia emprada és o no una eina eficaç per tal d'ensenyar aquests conceptes a l'alumnat. Igual que la societat és conscient de què és la fissió, cal que coneguin què podria ser la fusió; no es pot oblidar que l'energia nuclear és un ampli camp d'anàlisi en el tractament d'estudis CTS (ciència, tecnologia i societat).

Published
2017

13. New Beta-delayed Neutron Measurements in the Light-mass Fission Group

Author

M. B. Gómez-Hornillos, R. Caballero-Folch, B. Rubio, A. R. García, G. Cortes, W. Gelletly, Heikki Penttilä, D. Jordan, Juho Rissanen, C. Domingo-Pardo, J. Agramunt, Tommi Eronen, Juha Äystö, D. Cano-Ott, P. J. R. Mason, A. Algora, Jani Hakala, Ari Jokinen, V. Kolkinen, Antti Saastamoinen, J. L. Tain, E. Valencia, A. Riego, Iain Moore, Anu Kankainen, F. Calviño, T. Martinez, Zs. Podolyák, M. Reponen, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, and Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions

Subjects
Physics, Energies::Energia nuclear [Àrees temàtiques de la UPC], Nuclear and High Energy Physics, ta114, Neutron emission, Energies [Àrees temàtiques de la UPC], Xenon-135, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Nuclear energy, Fast fission, Neutron temperature, Fissió nuclear, Nuclear physics, Prompt neutron, Isotopes, Neutron cross section, Neutron, Nuclear Experiment, Delayed neutron
Abstract

A new accurate determination of beta-delayed neutron emission probabilities from nuclei in the low mass region of the light fission group has been performed. The measurements were carried out using the BELEN 4π neutron counter at the IGISOL-JYFL mass separator in combination with a Penning trap. The new results significantly improve the uncertainties of neutron emission probabilities for {sup 91}Br, {sup 86}As, {sup 85}As, and {sup 85}Ge nuclei.

Published
2014

14. Towards the high-accuracy determination of the 238U fission cross section at the threshold region at CERN -€“ n_TOF

Author

S. Valenta, N. Colonna, Carlos Guerrero, M. P. W. Chin, P. Zugec, Marco Calviani, V. Ketlerov, F. Roman, C. Le Naour, Masayuki Igashira, V. Bécares, J. Salgado, N. Patronis, K. Fraval, E. Leal-Cidoncha, G. Cortes, C. Eleftheriadis, Roberto Capote, J. Pancin, L. Cosentino, W. Mondelaers, Thomas Rauscher, A. K. Saxena, Arnaud Ferrari, G. Rudolf, P. Rullhusen, Y. Kadi, J. Marganiec, D. Karadimos, S. Andriamonje, W.I. Furman, M. Embid-Segura, J. Billowes, D. Cano-Ott, C. Santos, S. Heinitz, M. Diakaki, B. Berthier, M. B. Gómez-Hornillos, E. González-Romero, E. Chiaveri, P. Cennini, Christoph Langer, F. Cerutti, M. Kerveno, L. Sarchiapone, Michael Heil, M. J. Vermeulen, L. Plukis, K. Fujii, G. Giubrone, M. Mosconi, A. R. García, M. Wiesher, I. F. Gonçalves, P. F. Mastinu, V. Variale, Roberto Versaci, W. Dridi, M. Brugger, T. Ware, F. Voss, S. O'Brien, E. Mendoza, E. Jericha, Paolo Finocchiaro, Dorothea Schumann, Diego Tarrio, Rene Reifarth, F. Kaeppeler, Stefan Schmidt, P. Pavlopoulos, Javier Praena, S. Lo Meo, E. Griesmayer, S. David, Srinivasan Ganesan, R. Terlizzi, P. Baumann, Vittorio Boccone, D. G. Jenkins, J. M. Quesada, Peter Schillebeeckx, L. Tassan-Got, A. Manousos, D. Bosnar, G. Tagliente, F. Mingrone, J. Andrzejewski, G. Aerts, P. Gurusamy, Ralf Plag, M. Kokkoris, Alberto Mengoni, M. Krtička, F. Calviño, M. A. Cortés-Giraldo, L. Ferrant, I. Duran, H. Álvarez, J. L. Tain, C. Weiß, V. Konovalov, C. Pretel, Niko Kivel, D. Villamarin, L. Perrot, T. Martinez, C. Rubbia, S. Marrone, S. Altstadt, P. Vaz, Alberto Ventura, P. M. Milazzo, Aaron Couture, C. Carrapiço, C. Lampoudis, A. Pavlik, C. Domingo-Pardo, G. Vannini, A. Musumarra, Marco T. Pigni, I. Dillmann, D. Karamanis, T. J. Wright, M. C. Vincente, Christoph A. Stephan, S. Isaev, R. C. Haight, C. Paradela, L. Audouin, R. Sarmento, R. Vlastou, E. Berthoumieux, M. Mastromarco, L. Tavora, Massimo Barbagallo, Anton Wallner, E. Dupont, A. J. M. Plompen, James L. Cox, Corrie S. Moreau, Jeri Kroll, C. Lederer, Maria Victoria Lozano, A. Riego, S. Walter, A. Goverdovski, F. Alvarez-Velarde, Gerald Badurek, Roberto Losito, F. Gramegna, F. Belloni, F. Gunsing, A. Poch, Cristian Massimi, Rugard Dressler, K. Wisshak, Mario Weigand, F. Becvar, M. Mirea, A. Tsinganis, H. Leeb, J. Perkowski, L.S. Leong, Vasilis Vlachoudis, Serot, O., Diakaki, M., Audouin, L., Berthoumieux, E., Calviani, M., Colonna, N., Dupont, E., Duran, I., Gunsing, F., Leal-Cidoncha, E., Le Naour, C., Leong, L.S., Mastromarco, M., Paradela, C., Tarrio, D., Tassan-Got, L., Aerts, G., Altstadt, S., Alvarez, H., Alvarez-Velarde, F., Andriamonje, S., Andrzejewski, J., Badurek, G., Barbagallo, M., Baumann, P., Becares, V., Becvar, F., Belloni, F., Berthier, B., Billowes, J., Boccone, V., Bosnar, D., Brugger, M., Calvino, F., Cano-Ott, D., Capote, R., Carrapiço, C., Cennini, P., Cerutti, F., Chiaveri, E., Chin, M., Cortes, G., Cortes-Giraldo, M.A., Cosentino, L., Couture, A., Cox, J., David, S., Dillmann, I., Domingo-Pardo, C., Dressler, R., Dridi, W., Eleftheriadis, C., Embid-Segura, M., Ferrant, L., Ferrari, A., Finocchiaro, P., Fraval, K., Fujii, K., Furman, W., Ganesan, S., Garcia, A.R., Giubrone, G., Gomez-Hornillos, M.B., Goncalves, I.F., Gonzalez-Romero, E., Goverdovski, A., Gramegna, F., Griesmayer, E., Guerrero, C., Gurusamy, P., Haight, R., Heil, M., Heinitz, S., Igashira, M., Isaev, S., Jenkins, D.G., Jericha, E., Kadi, Y., Kaeppeler, F., Karadimos, D., Karamanis, D., Kerveno, M., Ketlerov, V., Kivel, N., Kokkoris, M., Konovalov, V., Krticka, M., Kroll, J., Lampoudis, C., Langer, C., Lederer, C., Leeb, H., Lo Meo, S., Losito, R., Lozano, M., Manousos, A., Marganiec, J., Martinez, T., Marrone, S., Massimi, C., Mastinu, P., Mendoza, E., Mengoni, A., Milazzo, P.M., Mingrone, F., Mirea, M., Mondelaers, W., Moreau, C., Mosconi, M., Musumarra, A., O’Brien, S., Pancin, J., Patronis, N., Pavlik, A., Pavlopoulos, P., Perkowski, J., Perrot, L., Pigni, M.T., Plag, R., Plompen, A., Plukis, L., Poch, A., Pretel, C., Praena, J., Quesada, J., Rauscher, T., Reifarth, R., Riego, A., Roman, F., Rudolf, G., Rubbia, C., Rullhusen, P., Salgado, J., Santos, C., Sarchiapone, L., Sarmento, R., Saxena, A., Schillebeeckx, P., Schmidt, S., Schumann, D., Stephan, C., Tagliente, G., Tain, J.L., Tavora, L., Terlizzi, R., Tsinganis, A., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Versaci, R., Vermeulen, M.J., Villamarin, D., Vincente, M.C., Vlachoudis, V., Vlastou, R., Voss, F., Wallner, A., Walter, S., Ware, T., Weigand, M., Weiß, C., Wiesher, M., Wisshak, K., Wright, T., Zugec, P., Universitat Politècnica de Catalunya. Departament de Física, and Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group

Subjects
Nuclear reaction, Fission, QC1-999, Nuclear Theory, Nuclear physics, Mechanical engineering, U238, neutron fission, 7. Clean energy, 01 natural sciences, Fissió nuclear, ANGULAR-DISTRIBUTION, Subatomär fysik, Cross section (physics), 0103 physical sciences, Subatomic Physics, Neutron, 010306 general physics, Nuclear Experiment, Energies::Energia nuclear [Àrees temàtiques de la UPC], Physics, Large Hadron Collider, 010308 nuclear & particles physics, Nuclear fission, Física nuclear
Abstract

The U-238 fission cross section is an international standard beyond 2 MeV where the fission plateau starts. However, due to its importance in fission reactors, this cross-section should be very accurately known also in the threshold region below 2 MeV. The U-238 fission cross section has been measured relative to the U-235 fission cross section at CERN - n_TOF with different detection systems. These datasets have been collected and suitably combined to increase the counting statistics in the threshold region from about 300 keV up to 3 MeV. The results are compared with other experimental data, evaluated libraries, and the IAEA standards.

Published
2016

15. High accuracy 234U(n,f) cross section in the resonance energy region

Author

Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Leal-Cidoncha, E., Durán, I., Paradela, C., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gomez Hornillos, B., Riego Pérez, Albert, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Leal-Cidoncha, E., Durán, I., Paradela, C., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gomez Hornillos, B., and Riego Pérez, Albert

Abstract

New results are presented of the 234U neutron-induced fission cross section, obtained with high accuracy in the resonance region by means of two methods using the 235U(n,f) as reference. The recent evaluation of the 235U(n,f) obtained with SAMMY by L. C. Leal et al. (these Proceedings), based on previous n TOF data has been used to calculate the 234U(n,f) cross section through the 234U/235U ratio, being here compared with the results obtained by using the n TOF neutron flux., Postprint (published version)

Published
2016

16. Nuclear astrophysics at n-TOF facility, CERN

Author

Tagliente, G., Abbondanno, U., Aerts, G., Álvarez, H., Álvarez Velarde, F., Andriamonje, S., Andrzejewski, Józef, Audouin, Ludmila, Badurek, G., Baumann, G., Calviño Tavares, Francisco|||0000-0002-7198-4639, Cortes, G., Poch, Agustí, Pretel, C., Quesada, J., Universitat Politècnica de Catalunya. Departament de Física, and Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group

Subjects
Energies::Energia nuclear [Àrees temàtiques de la UPC], Astrofísica, Physics::Instrumentation and Detectors, Física::Astronomia i astrofísica [Àrees temàtiques de la UPC], Nuclear physics, Physics::Accelerator Physics, Nuclear Experiment, Astrophysics, Fissió nuclear
Abstract

The innovative feature of the n-TOF facility at CERN, in the two experimental areas, (20 m and 200 m flight paths), allow for an accurate determination of the neutron capture cross section for radioactive samples or for isotopes with small neutron capture cross section, of interest for Nuclear Astrophysics. This contribution presents an overview on the astrophysical program carried on at the n-TOF facility, the main results and their implications. © 2015, CERN. All rights reserved

Published
2015

17. Towards the high-accuracy determination of the U-238 fission cross section at the threshold region at CERN - n_TOF

Author

Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Diakaki, M., Audouin, Ludmila, Berthoumieux, Eric, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Pretel Sánchez, Carme, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Diakaki, M., Audouin, Ludmila, Berthoumieux, Eric, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, and Pretel Sánchez, Carme

Abstract

The U-238 fission cross section is an international standard beyond 2 MeV where the fission plateau starts. However, due to its importance in fission reactors, this cross-section should be very accurately known also in the threshold region below 2 MeV. The U-238 fission cross section has been measured relative to the U-235 fission cross section at CERN - n_TOF with different detection systems. These datasets have been collected and suitably combined to increase the counting statistics in the threshold region from about 300 keV up to 3 MeV. The results are compared with other experimental data, evaluated libraries, and the IAEA standards., Postprint (published version)

Published
2015

18. High-accuracy determination of the 238U/ 235U fission cross section ratio up to ˜ 1 GeV at n_TOF at CERN

Author

Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Universitat Politècnica de Catalunya. NERG - Grup de Recerca d'Enginyeria Nuclear, Paradela, C., Calviani, Marco, Tarrío, D., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Pretel Sánchez, Carme, Riego Pérez, Albert, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Universitat Politècnica de Catalunya. NERG - Grup de Recerca d'Enginyeria Nuclear, Paradela, C., Calviani, Marco, Tarrío, D., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Pretel Sánchez, Carme, and Riego Pérez, Albert

Abstract

The U238 to U235 fission cross section ratio has been determined at n_TOF up to ˜1 GeV, with two different detection systems, in different geometrical configurations. A total of four datasets has been collected and compared. They are all consistent to each other within the relative systematic uncertainty of 3–4%. The data collected at n_TOF have been suitably combined to yield a unique fission cross section ratio as a function of neutron energy. The result confirms current evaluations up to 200 MeV. Good agreement is also observed with theoretical calculations based on the INCL++/Gemini++ combination up to the highest measured energy. The n_TOF results may help solve a long-standing discrepancy between the two most important experimental datasets available so far above 20 MeV, while extending the neutron energy range for the first time up to ˜1 GeV., Postprint (published version)

Published
2015

19. Towards the high-accuracy determination of the 238U fission cross section at the threshold region at CERN – n_TOF

Author

Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Diakaki, M., Audouin, Ludmila, Berthoumieux, Eric, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Pretel Sánchez, Carme, Riego Pérez, Albert, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Diakaki, M., Audouin, Ludmila, Berthoumieux, Eric, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Pretel Sánchez, Carme, and Riego Pérez, Albert

Abstract

The 238U fission cross section is an international standard beyond 2 MeV where the fission plateau starts. However, due to its importance in fission reactors, this cross-section should be very accurately known also in the threshold region below 2 MeV. The 238U fission cross section has been measured relative to the 235U fission cross section at CERN – n_TOF with different detection systems. These datasets have been collected and suitably combined to increase the counting statistics in the threshold region from about 300 keV up to 3 MeV. The results are compared with other experimental data, evaluated libraries, and the IAEA standards, Postprint (published version)

Published
2015

20. Fission fragment angular distribution measurements of U-235 and U-238 at CERN n_TOF facility

Author

Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Leal-Cidoncha, E., Durán, I., Paradela, C., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Leal-Cidoncha, E., Durán, I., Paradela, C., Calviño Tavares, Francisco, and Cortés Rossell, Guillem Pere

Abstract

Neutron-induced fission cross sections of U-238 and U-235 are used as standards in the fast neutron region up to 200 MeV. A high accuracy of the standards is relevant to experimentally determine other neutron reaction cross sections. Therefore, the detection efficiency should be corrected by using the angular distribution of the fission fragments (FFAD), which are barely known above 20 MeV. In addition, the angular distribution of the fragments produced in the fission of highly excited and deformed nuclei is an important observable to investigate the nuclear fission process. In order to measure the FFAD of neutron-induced reactions, a fission detection setup based on parallel-plate avalanche counters (PPACs) has been developed and successfully used at the CERN-n_TOF facility. In this work, we present the preliminary results on the analysis of new U-235(n,f) and U-238(n,f) data in the extended energy range up to 200 MeV compared to the existing experimental data., Postprint (published version)

Published
2015

21. Neutron-induced fission cross section of Pu-240 from 0.5 MeV to 3 MeV

Author

Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Salvador Castiñeira, Paula Genoveva, Brys, Tomasz, Eykens, Roger, Hambsch, Franz Josef, Gook, A., Moens, André, Oberstedt, Stephan, Sibbens, Geodele, Vanleeuw, David, Vidali, Marzio, Pretel Sánchez, Carme, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Salvador Castiñeira, Paula Genoveva, Brys, Tomasz, Eykens, Roger, Hambsch, Franz Josef, Gook, A., Moens, André, Oberstedt, Stephan, Sibbens, Geodele, Vanleeuw, David, Vidali, Marzio, and Pretel Sánchez, Carme

Abstract

Pu-240 has recently been pointed out by a sensitivity study of the Organization for Economic Cooperation and Development (OECD) Nuclear Energy Agency (NEA) to be one of the isotopes whose fission cross section lacks accuracy to meet the upcoming needs for the future generation of nuclear power plants (GEN-IV). In the High Priority Request List (HPRL) of the OECD, it is suggested that the knowledge of the Pu-240(n, f) cross section should be improved to an accuracy within 1-3 %, compared to the present 5%. A measurement of the Pu-240 cross section has been performed at the Van de Graaff accelerator of the Joint Research Center (JRC) Institute for Reference Materials and Measurements (IRMM) using quasi-monoenergetic neutrons in the energy range from 0.5 MeV to 3 MeV. A twin Frisch-grid ionization chamber (TFGIC) has been used in a back-to-back configuration as fission fragment detector. The Pu-240(n, f) cross section has been normalized to three different isotopes: Np-237(n, f), U-235(n, f), and U-238(n, f). Additionally, the secondary standard reactions were benchmarked through measurements against the primary standard reaction U-235(n, f) in the same geometry. A comprehensive study of the corrections applied to the data and the associated uncertainties is given. The results obtained are in agreement with previous experimental data at the threshold region. For neutron energies higher than 1 MeV, the results of this experiment are slightly lower than the ENDF/B-VII.1 evaluation, but in agreement with the experiments of Laptev et al. (2004) as well as Staples and Morley (1998)., Postprint (published version)

Published
2015

22. Neutron-induced Fission Cross Section of240,242Pu

Author

Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Salvador Castiñeira, P., Brys, Tomasz, Eykens, Roger, Hambsch, Franz Josef, Gook, A., Oberstedt, Stephan, Pretel Sánchez, Carme, Sibbens, Geodele, Vanleeuw, David, Vidali, Marzio, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Salvador Castiñeira, P., Brys, Tomasz, Eykens, Roger, Hambsch, Franz Josef, Gook, A., Oberstedt, Stephan, Pretel Sánchez, Carme, Sibbens, Geodele, Vanleeuw, David, and Vidali, Marzio

Abstract

A sensitivity analysis for the new generation of fast reactors [Salvatores (2008)] has shown the importance of improved cross section data for several actinides. Among them, the240,242Pu(n,f) cross sections require an accuracy improvement to 1-3% and 3-5%, respectively, from the current level of 6% and 20%. At the Van de Graaff facility of the Institute for Reference Materials and Measurements (JRC-IRMM) the fission cross section of the two isotopes was measured relative to two secondary standard reactions,237Np(n,f) and238U(n,f), using a twin Frisch-grid ionization chamber. The secondary standard reactions were benchmarked through measurements against the primary standard reaction235U(n,f) in the same geometry. Sample masses were determined by means of low-geometry alpha counting or/and a 2p Frisch-grid ionization chamber, with an uncertainty lower than 2%. The neutron flux and the impact of scattering from material between source and target was examined, the largest effect having been found in cross section ratio measurements between a fissile and a fertile isotope. Our240,242Pu(n,f) cross sections are in agreement with previous experimental results and slightly lower than present evaluations. In case of the242Pu(n,f) reaction no evidence for a resonance at En=1.1 MeV was found., Postprint (published version)

Published
2015

23. Nuclear astrophysics at n-TOF facility, CERN

Author

Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Tagliente, G., Abbondanno, U., Aerts, G., Álvarez, H., Álvarez Velarde, F., Andriamonje, S., Andrzejewski, Józef, Audouin, Ludmila, Badurek, G., Baumann, G., Calviño Tavares, Francisco, Cortes, G., Poch, Agustí, Pretel, C., Quesada, J., Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Tagliente, G., Abbondanno, U., Aerts, G., Álvarez, H., Álvarez Velarde, F., Andriamonje, S., Andrzejewski, Józef, Audouin, Ludmila, Badurek, G., Baumann, G., Calviño Tavares, Francisco, Cortes, G., Poch, Agustí, Pretel, C., and Quesada, J.

Abstract

The innovative feature of the n-TOF facility at CERN, in the two experimental areas, (20 m and 200 m flight paths), allow for an accurate determination of the neutron capture cross section for radioactive samples or for isotopes with small neutron capture cross section, of interest for Nuclear Astrophysics. This contribution presents an overview on the astrophysical program carried on at the n-TOF facility, the main results and their implications. © 2015, CERN. All rights reserved, Postprint (author's final draft)

Published
2015

24. New Beta-delayed neutron measurements in the light-mass fission group

Author

Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Äystö, J., Caballero Folch, Roger, Calviño Tavares, Francisco, Eronen, T., Gelletly, W., Gómez Hornillos, María Belén, Moore, I., Penttila, H., Reponen, M., Riego Pérez, Albert, Rissanen, J., Rubio, B., Valencia, E., Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Äystö, J., Caballero Folch, Roger, Calviño Tavares, Francisco, Eronen, T., Gelletly, W., Gómez Hornillos, María Belén, Moore, I., Penttila, H., Reponen, M., Riego Pérez, Albert, Rissanen, J., Rubio, B., and Valencia, E.

Abstract

A new accurate determination of beta-delayed neutron emission probabilities from nuclei in the low mass region of the light fission group has been performed. The measurements were carried out using the BELEN 4 pi neutron counter at the IGISOL-JYFL mass separator in combination with a Penning trap. The new results significantly improve the uncertainties of neutron emission probabilities for Br-91, As-86, As-85, and Ge-85 nuclei., Postprint (published version)

Published
2014

25. Neutron-induced fission cross section of 245Cm: New results from data taken at the time-of-flight facility n_TOF

Author

G. Cortes, Gerald Badurek, P. Cennini, J. Pancin, E. Chiaveri, D. Cano-Ott, C. Eleftheriadis, B. Berthier, Michael Heil, E. Kossionides, J. Salgado, Javier Praena, C. Santos, I. Duran, M. Embid-Segura, S. Walter, Roberto Capote, Yacine Kadi, A. Poch, F. Bečvář, E. Mendoza, M. C. Vincente, J. Marganiec, S. Andriamonje, M. Dahlfors, Manuel Lozano, F. Neves, Ralf Plag, M. Mosconi, V. Ketlerov, P. Vaz, L. Ferrant, Peter Schillebeeckx, Iris Dillmann, D. Villamarin, W. Dridi, P. F. Mastinu, J. Cox, Alberto Ventura, S. Galanopoulos, Aaron Couture, Marco T. Pigni, G. Vannini, C. Lederer, C. Papadopoulos, Laurent Tassan-Got, C. Stephan, C. Lampoudis, Alfredo Ferrari, R. Ferreira-Marques, S. Marrone, A. Pavlik, C. Domingo-Pardo, L. Perrot, M. Kerveno, S. David, L. Sarchiapone, M. Meaze, G. Tagliente, M. Rosetti, R. Terlizzi, E. Gonzalez-Romero, G. Aerts, Carlos Guerrero, U. Abbondanno, F. Calviño, R. C. Haight, H. Leeb, P. E. Koehler, V. Chepel, Heinz Oberhummer, I. Goncalves, S. O'Brien, A. Plukis, P. Assimakopoulos, Mario Barbagallo, I. Savvidis, L. Tavora, Thomas Rauscher, Marco Calviani, L. Audouin, D. Karadimos, Michael Wiescher, H. Álvarez, W.I. Furman, P. Baumann, K. Wisshak, V. Variale, M. Krtička, R. Sarmento, J. L. Tain, A. J. M. Plompen, A. Herrera-Martinez, N. Patronis, P. Rullhusen, G. Rudolf, A. Lindote, T. Martinez, I. Lopes, C. A. Papachristodoulou, R. Vlastou, Alberto Mengoni, B. Haas, C. Carrapiço, Rene Reifarth, M. Igashira, P. Pavlopoulos, F. Gunsing, J. M. Quesada, Cristian Massimi, C. Paradela, S. Lukic, E. Jericha, D. Karamanis, E. Berthoumieux, F. Voss, F. Gramegna, Nicola Colonna, C. Moreau, P. M. Milazzo, J. Andrzejewski, Carlo Rubbia, V. Vlachoudis, V. Konovalov, G. Giubrone, C. Pretel, K. Fujii, Fabio Belloni, F. Käppeler, A. Goverdovski, F. Alvarez-Velarde, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, European Commission (EC), 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 de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Département Recherches Subatomiques (DRS-IPHC), 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)-Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Aval du cycle et Energie Nucléaire (ACEN), 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)-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), 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), Pôle Universitaire Léonard de Vinci, Pôle Universitaire Léonard de Vinci (PULV), nTOF, Calviani M., Meaze M. H., Colonna N., Praena J., Abbondanno U., Aerts G., Alvarez H., Alvarez-Velarde F., Andriamonje S., Andrzejewski J., Assimakopoulos P., Audouin L., Badurek G., Barbagallo M., Baumann P., Bečvář F., Belloni F., Berthier B., Berthoumieux E., Calviño F., Cano-Ott D., Capote R., Carrapiço C., Cennini P., Chepel V., Chiaveri E., Cortes G., Couture A., Cox J., Dahlfors M., David S., Dillmann I., Domingo-Pardo C., Dridi W., Duran I., Eleftheriadis C., Embid-Segura M., Ferrant L., Ferrari A., Ferreira-Marques R., Fujii K., Furman W., Galanopoulos S., Giubrone G., Gonçalves I., Gonzalez-Romero E., Goverdovski A., Gramegna F., Guerrero C., Gunsing F., Haas B., Haight R., Heil M., Herrera-Martinez A., Igashira M., Jericha E., Käppeler F., Kadi Y., Karadimos D., Karamanis D., Ketlerov V., Kerveno M., Koehler P., Konovalov V., Kossionides E., Krtička M., Lampoudis C., Lederer C., Leeb H., Lindote A., Lopes I., Lozano M., Lukic S., Marganiec J., Marrone S., Martínez T., Massimi C., Mastinu P., Mendoza E., Mengoni A., Milazzo P. M., Moreau C., Mosconi M., Neves F., Oberhummer H., O’Brien S., Pancin J., Papachristodoulou C., Papadopoulos C., Paradela C., Patronis N., Pavlik A., Pavlopoulos P., Perrot L., Pigni M. T., Plag R., Plompen A., Plukis A., Poch A., Pretel C., Quesada J., Rauscher T., Reifarth R., Rosetti M., Rubbia C., Rudolf G., Rullhusen P., Salgado J., Santos C., Sarchiapone L., Sarmento R., Savvidis I., Schillebeeckx P., Stephan C., Tagliente G., Tain J. L., Tassan-Got L., Tavora L., Terlizzi R., Vannini G., Variale V., Vaz P., Ventura A., Villamarin D., Vincente M. C., Vlachoudis V., Vlastou R., Voss F., Walter S., Wiescher M., Wisshak K., Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université 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)-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), 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)-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 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, Energies::Energia nuclear [Àrees temàtiques de la UPC], Nuclear and High Energy Physics, Range (particle radiation), Isotope, 010308 nuclear & particles physics, Fission, Nuclear Theory, Absolute value, Energies::Energia nuclear::Reactors nuclears de fissió [Àrees temàtiques de la UPC], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Neutron temperature, NEUTRON INDUCED FISSION, Fissió nuclear, Nuclear physics, Time of flight, Cross section (physics), 0103 physical sciences, Fission cross sections, Neutron, 010306 general physics, Nuclear Experiment, TIME OF FLIGHT
Abstract

The neutron-induced fission cross section of 245Cm was measured at n-TOF in a wide energy range and with high resolution. The energy dependence, measured in a single measurement from 30 meV to 1 MeV neutron energy, has been determined with 5% accuracy relative to the 235U(n,f) cross section. In order to reduce the uncertainty on the absolute value, the data have been normalized at thermal energy to recent measurements performed at ILL and BR1. In the energy range of overlap, the results are in fair agreement with some previous measurements and confirm, on average, the evaluated cross section in the ENDF/B-VII.0 database, although sizable differences are observed for some important resonances below 20 eV. A similar behavior is observed relative to JENDL/AC-2008, a reactor-oriented database for actinides. The new results contribute to the overall improvement of the databases needed for the design of advanced reactor systems and may lead to refinements of fission models for the actinides. Comisión Europea FIKW-CT-2000-00107 249671

Published
2012

26. Measurement of the Pu-240,242 neutron-induced fission cross sections

Author

Salvador-Castiñeria, P, Bevilacqua, R, Brys, T, Hambsch, FJ, Oberstedt, S, Pretel Sánchez, Carme, Vidali, M, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, and Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions

Subjects
Energies::Energia nuclear [Àrees temàtiques de la UPC], Nuclear fission, Energies::Energia nuclear::Reactors nuclears de fissió [Àrees temàtiques de la UPC], Fissió nuclear
Published
2012

27. Neutron-induced fission cross section of 245-Cm: New results from data taken at the time-of-flight facility n_TOF

Author

Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Poch Parés, Agustí, Pretel Sánchez, Carme, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Poch Parés, Agustí, and Pretel Sánchez, Carme

Abstract

The neutron-induced fission cross section of 245Cm was measured at n_TOF in a wide energy range and with high resolution. The energy dependence, measured in a single measurement from 30 meV to 1 MeV neutron energy, has been determined with 5% accuracy relative to the 235U(n,f) cross section. In order to reduce the uncertainty on the absolute value, the data have been normalized at thermal energy to recent measurements performed at ILL and BR1. In the energy range of overlap, the results are in fair agreement with some previous measurements and confirm, on average, the evaluated cross section in the ENDF/B-VII.0 database, although sizable differences are observed for some important resonances below 20 eV. A similar behavior is observed relative to JENDL/AC-2008, a reactor-oriented database for actinides. The new results contribute to the overall improvement of the databases needed for the design of advanced reactor systems and may lead to refinements of fission models for the actinides., Postprint (published version)

Published
2012

28. Measurement of the Pu-240,242 neutron-induced fission cross sections

Author

Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Salvador-Castiñeria, P, Bevilacqua, R, Brys, T, Hambsch, FJ, Oberstedt, S, Pretel Sánchez, Carme, Vidali, M, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Salvador-Castiñeria, P, Bevilacqua, R, Brys, T, Hambsch, FJ, Oberstedt, S, Pretel Sánchez, Carme, and Vidali, M

Abstract

Postprint (published version)

Published
2012

29. Neutron-induced fission cross-section of U-233 in the energy range 0.5 < E-n < 20 MeV

Author

Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Poch Parés, Agustí, Pretel Sánchez, Carme, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Poch Parés, Agustí, and Pretel Sánchez, Carme

Abstract

The neutron-induced fission cross-section of 233U has been measured at the CERN n TOF facility relative to the standard fission cross-section of 235U between 0.5 and 20MeV. The experiment was performed with a fast ionization chamber for the detection of the fission fragments and to discriminate against α-particles from the natural radioactivity of the samples. The high instantaneous flux and the low background of the n TOF facility result in data with uncertainties of ≈ 3%, which were found in good agreement with previous experiments. The high quality of the present results allows to improve the evaluation of the 233U(n,f) cross-section and, consequently, the design of energy systems based on the Th/U cycle., Postprint (published version)

Published
2011

30. Assessment and further development of programs for medical therapy using fussion neutrons

Author

Macián-Juan, Rafael, González Martí, Marta, Macián-Juan, Rafael, and González Martí, Marta

Abstract

The MedApp treatment facility of FRM II provides a horizontally fixed beam of unmoderated fission neutrons. Since high LET radiation can deactivate cells rather independently of their phase in the cell cycle, their repair capacities and their oxygenation state, fast neutrons offer advantages especially for the treatment of radioresistant tumours. Scope of this thesis is the establishment of a treatment planning system (TPS) for the MedApp facility with retrospective purposes. The development of a personalised dosimetric tool will improve the accuracy of the predictions of the dose absorbed by the different tissues surrounding the tumour and by the tumour itself. This will improve the quality of treatments with fast neutrons. The capabilities of different simulation softwares used for that purpose were studied. The main objective of the thesis was to find out whether these simulation programs were suitable to run TPS simulations for fission neutron radiotherapy at the MedApp facility. Two programs, SERA and ImageJ combined with MCNPX, were chosen for a closer analysis. The features of both programs were studied. To match the MedApp requirements their capabilities were extended. So as to facilitate the user task, work was done to adapt these programs and scripts were written in order to generate the inputs data for both programs. The segmenting process which is the most time consuming step in the planning procedure, was analysed in order to find a possible procedure which simplifies the process, especially for novice users. To verify the suitability of the studied programs, calculations of the dose distribution in different phantoms were made and compared with measurements. Moreover, calculations with human voxelised phantoms were also carried out in order to test the suitability of the programs for human dosimetry. The results obtained with both simulations programs were in good agreement with the depth dose measurements in the water phantom of the MedApp facility. M, Outgoing

Published
2010

31. Dynamic and quasistatic trajectories in quasifission reactions and particle emission

Author

X. Viñas, M. Centelles, V. P. Aleshin, N. G. Nicolis, and Universitat de Barcelona

Subjects
Thermal equilibrium, Physics, Nuclear and High Energy Physics, Nuclear Theory, Fission, Phase (waves), Nuclear physics, Nuclear fission, Binary number, FOS: Physical sciences, Alpha particle, Dissipation, Partícules (Física nuclear), Fissió nuclear, Nuclear Theory (nucl-th), Monte Carlo method, Neutron, Física nuclear, Statistical physics, Atomic physics, Nuclear Experiment, Mètode de Montecarlo, Quasistatic process, Física estadística, Particles (Nuclear physics)
Abstract

We show that the quasifission paths predicted by the one-body dissipation dynamics, in the slowest phase of a binary reaction, follow a quasistatic path, which represents a sequence of states of thermal equilibrium at a fixed value of the deformation coordinate. This establishes the use of the statistical particle-evaporation model in the case of dynamical time-evolving systems. Pre- and post-scission multiplicities of neutrons and total multiplicities of protons and alpha particles in fission reactions of 63Cu+92Mo, 60Ni+100Mo, 63Cu+100Mo at 10 MeV/u and 20Ne+144,148,154Sm at 20 MeV/u are reproduced reasonably well with statistical model calculations performed along dynamic trajectories whose slow stage (from the most compact configuration up to the point where the neck starts to develop) lasts some 35x10^{-21} s., Comment: 29 pages, 9 figures

Published
2001

32. Estimation of temperature effects on fission barriers

Author

X. Vinas, M. Barranco, M. Pi, and Universitat de Barcelona

Subjects
Physics, Nuclear and High Energy Physics, Mathematical model, Reaccions nuclears, Fission, Nuclear fission, Mechanics, Deformation (meteorology), Fissió nuclear, Mass formula, Nuclear physics, Physics::Fluid Dynamics, Semi-empirical mass formula, Nuclear reactions, Energy (signal processing)
Abstract

An accurate mass formula at finite temperature has been used to obtain a more precise estimation of temperature effects on fission barriers calculated within the liquid drop model.

Published
1982

33. Neutron-induced fission cross-section of U-233 in the energy range 0.5 < E-n < 20 MeV

Author

Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Poch Parés, Agustí, Pretel Sánchez, Carme, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, and Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions

Subjects
Energies::Energia nuclear [Àrees temàtiques de la UPC], Physics::Instrumentation and Detectors, Nuclear fission, Energia nuclear, Nuclear energy, Energies::Energia nuclear::Reactors nuclears de fissió [Àrees temàtiques de la UPC], Nuclear Experiment, Fissió nuclear
Abstract

The neutron-induced fission cross-section of 233U has been measured at the CERN n TOF facility relative to the standard fission cross-section of 235U between 0.5 and 20MeV. The experiment was performed with a fast ionization chamber for the detection of the fission fragments and to discriminate against α-particles from the natural radioactivity of the samples. The high instantaneous flux and the low background of the n TOF facility result in data with uncertainties of ≈ 3%, which were found in good agreement with previous experiments. The high quality of the present results allows to improve the evaluation of the 233U(n,f) cross-section and, consequently, the design of energy systems based on the Th/U cycle.

34. Towards the high-accuracy determination of the U-238 fission cross section at the threshold region at CERN - n_TOF

Author

Diakaki, M., Audouin, Ludmila, Berthoumieux, Eric, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Pretel Sánchez, Carme, Universitat Politècnica de Catalunya. Departament de Física, and Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group

Subjects
Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, Fission, U238, Física [Àrees temàtiques de la UPC], Cross section, nTOF, Nuclear Theory, CERN, Neutron, Nuclear Experiment, Fissió nuclear
Abstract

The U-238 fission cross section is an international standard beyond 2 MeV where the fission plateau starts. However, due to its importance in fission reactors, this cross-section should be very accurately known also in the threshold region below 2 MeV. The U-238 fission cross section has been measured relative to the U-235 fission cross section at CERN - n_TOF with different detection systems. These datasets have been collected and suitably combined to increase the counting statistics in the threshold region from about 300 keV up to 3 MeV. The results are compared with other experimental data, evaluated libraries, and the IAEA standards.

35. High accuracy 234U(n,f) cross section in the resonance energy region

Author

A. R. García, A. Mallick, G. Vannini, N. Kivel, E. Chiaveri, D. Cano-Ott, M. A. Cortés-Giraldo, M. Brugger, Gilles Noguere, M. Weigand, F. Belloni, C. Lampoudis, A. Pavlik, P. Gurusamy, C. Domingo-Pardo, Rene Reifarth, Vittorio Boccone, J. M. Quesada, L. Tassan-Got, A. Hernández-Prieto, G. Cortes, I. F. Gonçalves, A. Riego, Alfredo Ferrari, D. Tarrío, E. Leal-Cidoncha, C. Eleftheriadis, T. Wright, M. Kokkoris, Thomas Rauscher, F. Cerutti, M. Meaze, M. J. Vermeulen, A. Manousos, P. Vaz, D. Karadimos, D. G. Jenkins, Srinivasan Ganesan, P. Schillebeeckx, Alberto Ventura, S. Altstadt, C. Le Naour, R. Vlastou, E. González-Romero, M. P. W. Chin, G. Tagliente, Luiz Leal, M. B. Gómez-Hornillos, Christoph Langer, M. Sabaté-Gilarte, V. Bécares, Alberto Mengoni, J. Billowes, Damir Bosnar, Mario Barbagallo, D. Schumann, Y. Kadi, E. Jericha, W. Mondelaers, F. Käppeler, F. Roman, Javier Praena, E. Mendoza, I. Duran, S. Valenta, M. S. Robles, Marco Calviani, K. Fraval, V. Variale, C. Lederer, Roberto Versaci, M. Diakaki, M. Mastromarco, C. Weiß, F. Bečvář, A. Saxena, M. Krtička, C. Carrapiço, Anton Wallner, Jeri Kroll, R. Dressler, J. L. Tain, R. Sarmento, S. Schmidt, T. Martinez, T. Ware, E. Griesmayer, A. J. M. Plompen, J. Marganiec, Petar Žugec, P. F. Mastinu, E. Berthoumieux, L. Audouin, Carlos Guerrero, C. Paradela, M. Mirea, A. Tsinganis, Nicola Colonna, L.S. Leong, R. Losito, F. Mingrone, J. Andrzejewski, Carlo Rubbia, V. Vlachoudis, P. M. Milazzo, G. Giubrone, F. Gunsing, Cristian Massimi, F. Calviño, H. Leeb, J. Perkowski, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Leal-Cidoncha, E., Durán, I., Paradela, C., Tassan-Got, L., Audouin, L., Leal, L.C., Naour, C. Le, Noguere, G., Tarrío, D., Leong, L.S., Altstadt, S., Andrzejewski, J., Barbagallo, M., Bécares, V., Bečvář, F., Belloni, F., Berthoumieux, E., Billowes, J., Boccone, V., Bosnar, D., Brugger, M., Calviani, M., Calviño, F., Cano-Ott, D., Carrapiço, C., Cerutti, F., Chiaveri, E., Chin, M., Colonna, N., Cortés, G., Cortés-Giraldo, M.A., Diakaki, M., Domingo-Pardo, C., Dressler, R., Eleftheriadis, C., Ferrari, A., Fraval, K., Ganesan, S., García, A.R., Giubrone, G., Gómez-Hornillos, M.B., Gonçalves, I.F., González-Romero, E., Griesmayer, E., Guerrero, C., Gunsing, F., Gurusamy, P., Hernández-Prieto, A., Jenkins, D.G., Jericha, E., Kadi, Y., Käppeler, F., Karadimos, D., Kivel, N., Kokkoris, M., Krtička, M., Kroll, J., Lampoudis, C., Langer, C., Lederer, C., Leeb, H., Losito, R., Mallick, A., Manousos, A., Marganiec, J., Martínez, T., Massimi, C., Mastinu, P.F., Mastromarco, M., Meaze, M., Mendoza, E., Mengoni, A., Milazzo, P.M., Mingrone, F., Mirea, M., Mondelaers, W., Pavlik, A., Perkowski, J., Plompen, A., Praena, J., Quesada, J.M., Rauscher, T., Reifarth, R., Riego, A., Robles, M.S., Roman, F., Rubbia, C., Sabaté-Gilarte, M., Sarmento, R., Saxena, A., Schillebeeckx, P., Schmidt, S., Schumann, D., Tagliente, G., Tain, J.L., Tsinganis, A., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Versaci, R., Vermeulen, M.J., Vlachoudis, V., Vlastou, R., Wallner, A., Ware, T., Weigand, M., Weiß, C., Wright, T., Ugec, P., Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, 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), Institut de Radioprotection et de Sûreté Nucléaire (IRSN), CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, n_TOF, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay ( IPNO ), 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 Radioprotection et de Sûreté Nucléaire ( IRSN ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), Institut de Recherches sur les lois Fondamentales de l'Univers ( IRFU ), and Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay

Subjects
Nuclear reaction, Fission, nTOF, QC1-999, Analytical chemistry, Neutron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Resonance (particle physics), Fissió nuclear, Subatomär fysik, Cross section (physics), Physics and Astronomy (all), Nuclear magnetic resonance, Neutron flux, Subatomic Physics, 0103 physical sciences, CERN, ddc:530, Nuclear Physics - Experiment, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, Física [Àrees temàtiques de la UPC], Cross section, 010308 nuclear & particles physics, Chemistry, Physics, Nuclear fission, 13. Climate action, Energy (signal processing)
Abstract

New results are presented of the 234U neutron-induced fission cross section, obtained with high accuracy in the resonance region by means of two methods using the 235U(n,f) as reference. The recent evaluation of the 235U(n,f) obtained with SAMMY by L. C. Leal et al. (these Proceedings), based on previous n-TOF data [1], has been used to calculate the 234U(n,f) cross section through the 234U/235U ratio, being here compared with the results obtained by using the n-TOF neutron flux. © The Authors, published by EDP Sciences, 2017.

36. Fission fragment angular distribution measurements of U-235 and U-238 at CERN n_TOF facility

Author

F. Gunsing, Cristian Massimi, A. R. García, D. Bosnar, Srinivasan Ganesan, G. Cortes, M. Brugger, Mario Barbagallo, M. B. Gómez-Hornillos, Christoph Langer, Carlos Guerrero, M. S. Robles, A. Ventura, J. L. Tain, G. Giubrone, M. P. W. Chin, D. G. Jenkins, I. F. Gonçalves, D. Cano-Ott, P. Gurusamy, P. E. Koehler, M. Diakaki, F. Roman, Javier Praena, S. Lo Meo, Rene Reifarth, J. Marganiec, C. Lampoudis, F. Mingrone, A. Pavlik, J. Andrzejewski, Stefan Schmidt, C. Domingo-Pardo, C. Paradela, A. Manousos, M. A. Cortés-Giraldo, Niko Kivel, E. Jericha, Y. Kadi, L. Audouin, G. Tagliente, Dorothea Schumann, E. Chiaveri, Vittorio Boccone, P. F. Mastinu, E. Leal-Cidoncha, J. M. Quesada, C. Eleftheriadis, A. Mallick, G. Vannini, L. Tassan-Got, P. M. Milazzo, S. Valenta, Thomas Rauscher, I. Duran, C. Weiß, Marco Calviani, D. Karadimos, W. Mondelaers, A. Hernández-Prieto, P. Vaz, E. González-Romero, T. Ware, F. Cerutti, V. Variale, E. Griesmayer, M. Krtička, F. Calviño, Roberto Versaci, Alberto Mengoni, Diego Tarrio, T. Martinez, M. J. Vermeulen, F. Käppeler, C. Rubbia, M. Sabaté-Gilarte, Petar Žugec, M. Meaze, R. Vlastou, E. Berthoumieux, T. J. Wright, M. Kokkoris, M. Mastromarco, C. Carrapiço, Anton Wallner, A. K. Saxena, Arnaud Ferrari, J. Billowes, Rugard Dressler, K. Fraval, A. Tsinganis, Nicola Colonna, L.S. Leong, Vasilis Vlachoudis, Roberto Losito, V. Bécares, F. Bečvář, E. Mendoza, A. Riego, Peter Schillebeeckx, N. Dzysiuk, C. Lederer, S. Altstadt, A. J. M. Plompen, Jeri Kroll, R. Sarmento, M. Mirea, H. Leeb, J. Perkowski, Mario Weigand, F. Belloni, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Ventura, A., Mengoni, A., Lo Meo, S., Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Serot, O., Leal-Cidoncha, E., Durán, I., Paradela, C., Tarrío, D., Leong, L.S., Tassan-Got, L., Audouin, L., Altstadt, S., Andrzejewski, J., Barbagallo, M., Bécares, V., Bečvář, F., Belloni, F., Berthoumieux, E., Billowes, J., Boccone, V., Bosnar, D., Brugger, M., Calviani, M., Calviño, F., Cano-Ott, D., Carrapiço, C., Cerutti, F., Chiaveri, E., Chin, M., Colonna, N., Cortés, G., Cortés-Giraldo, M.A., Diakaki, M., Domingo-Pardo, C., Dressler, R., Dzysiuk, N., Eleftheriadis, C., Ferrari, A., Fraval, K., Ganesan, S., García, A.R., Giubrone, G., Gómez-Hornillos, M.B., Gonçalves, I.F., González-Romero, E., Griesmayer, E., Guerrero, C., Gunsing, F., Gurusamy, P., Hernández-Prieto, A., Jenkins, D.G., Jericha, E., Kadi, Y., Käppeler, F., Karadimos, D., Kivel, N., Koehler, P., Kokkoris, M., Krtička, M., Kroll, J., Lampoudis, C., Langer, C., Lederer, C., Leeb, H., Losito, R., Mallick, A., Manousos, A., Marganiec, J., Martínez, T., Massimi, C., Mastinu, P.F., Mastromarco, M., Meaze, M., Mendoza, E., Milazzo, P.M., Mingrone, F., Mirea, M., Mondelaers, W., Pavlik, A., Perkowski, J., Plompen, A., Praena, J., Quesada, J.M., Rauscher, T., Reifarth, R., Riego, A., Robles, M.S., Roman, F., Rubbia, C., Sabaté-Gilarte, M., Sarmento, R., Saxena, A., Schillebeeckx, P., Schmidt, S., Schumann, D., Tagliente, G., Tain, J.L., Tsinganis, A., Valenta, S., Vannini, G., Variale, V., Vaz, P., Versaci, R., Vermeulen, M.J., Vlachoudis, V., Vlastou, R., Wallner, A., Ware, T., Weigand, M., Weiß, C., Wright, T., and Žugec, P.

Subjects
neutron, fission, Fission, nTOF, Computer science, QC1-999, Nuclear Theory, Mechanical engineering, Neutron, 01 natural sciences, Fissió nuclear, Subatomär fysik, Nuclear physics, Cross section (physics), Subatomic Physics, 0103 physical sciences, CERN, ddc:530, 010306 general physics, Nuclear Experiment, Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, Range (particle radiation), Large Hadron Collider, Cross section, 010308 nuclear & particles physics, Physics, Fission fragments, Nuclear fission, Observable, Excited state
Abstract

Neutron-induced fission cross sections of 238U and 235U are used as standards in the fast neutron region up to 200 MeV. A high accuracy of the standards is relevant to experimentally determine other neutron reaction cross sections. Therefore, the detection effciency should be corrected by using the angular distribution of the fission fragments (FFAD), which are barely known above 20 MeV. In addition, the angular distribution of the fragments produced in the fission of highly excited and deformed nuclei is an important observable to investigate the nuclear fission process. In order to measure the FFAD of neutron-induced reactions, a fission detection setup based on parallel-plate avalanche counters (PPACs) has been developed and successfully used at the CERN-n-TOF facility. In this work, we present the preliminary results on the analysis of new 235U(n,f) and 238U(n,f) data in the extended energy range up to 200 MeV compared to the existing experimental data. © Owned by the authors, published by EDP Sciences, 2016.

37. Neutron-induced fission cross section of Pu-240 from 0.5 MeV to 3 MeV

Author

Salvador Castiñeira, Paula Genoveva, Brys, Tomasz, Eykens, Roger, Hambsch, Franz Josef, Gook, A., Moens, André, Oberstedt, Stephan, Sibbens, Geodele, Vanleeuw, David, Vidali, Marzio, Pretel Sánchez, Carme, Universitat Politècnica de Catalunya. Departament de Física, and Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group

Subjects
Energies::Energia nuclear [Àrees temàtiques de la UPC], Chamber, U-235, Energy-range, Science, Energia nuclear, Nuclear energy, Energies::Energia nuclear::Reactors nuclears de fissió [Àrees temàtiques de la UPC], 240PU, Fissió nuclear
Abstract

Pu-240 has recently been pointed out by a sensitivity study of the Organization for Economic Cooperation and Development (OECD) Nuclear Energy Agency (NEA) to be one of the isotopes whose fission cross section lacks accuracy to meet the upcoming needs for the future generation of nuclear power plants (GEN-IV). In the High Priority Request List (HPRL) of the OECD, it is suggested that the knowledge of the Pu-240(n, f) cross section should be improved to an accuracy within 1-3 %, compared to the present 5%. A measurement of the Pu-240 cross section has been performed at the Van de Graaff accelerator of the Joint Research Center (JRC) Institute for Reference Materials and Measurements (IRMM) using quasi-monoenergetic neutrons in the energy range from 0.5 MeV to 3 MeV. A twin Frisch-grid ionization chamber (TFGIC) has been used in a back-to-back configuration as fission fragment detector. The Pu-240(n, f) cross section has been normalized to three different isotopes: Np-237(n, f), U-235(n, f), and U-238(n, f). Additionally, the secondary standard reactions were benchmarked through measurements against the primary standard reaction U-235(n, f) in the same geometry. A comprehensive study of the corrections applied to the data and the associated uncertainties is given. The results obtained are in agreement with previous experimental data at the threshold region. For neutron energies higher than 1 MeV, the results of this experiment are slightly lower than the ENDF/B-VII.1 evaluation, but in agreement with the experiments of Laptev et al. (2004) as well as Staples and Morley (1998).

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