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207 results on '"n_TOF"'

101. Fission fragment angular distribution of 232Th(n,f) at the CERN n TOF facility

Author: G. Vannini, Srinivasan Ganesan, S. Valenta, Marco Calviani, Arnaud Ferrari, V. Bécares, M. P. W. Chin, Alberto Mengoni, F. Roman, M. J. Vermeulen, J. Billowes, D. Cano-Ott, C. Rubbia, M. Diakaki, R. Vlastou, J. Marganiec, M. A. Cortés-Giraldo, Damir Bosnar, Y. Kadi, C. Eleftheriadis, Thomas Rauscher, Javier Praena, T. Ware, I. F. Gonçalves, R. Versaci, D. Karadimos, J. L. Tain, A. Manousos, M. Kokkoris, C. Paradela, G. Cortes, E. González-Romero, E. Griesmayer, Fabio Belloni, M. B. Gómez-Hornillos, L. Audouin, Christoph Langer, A. R. García, D. Tarrío, S. Altstadt, M. Brugger, Rene Reifarth, P. M. Milazzo, E. Chiaveri, P. F. Mastinu, Stefan Schmidt, F. Bečvář, P. E. Koehler, Vittorio Boccone, J. M. Quesada, F. Cerutti, E. Mendoza, E. Jericha, L. Tassan-Got, F. Käppeler, C. Weiß, D. G. Jenkins, Peter Schillebeeckx, Carlos Guerrero, N. Dzysiuk, I. Duran, A. Ventura, P. Vaz, V. Variale, A. Pavlik, M. Krtička, C. Domingo-Pardo, G. Tagliente, T. Martinez, P. Gurusamy, K. Fraval, A. Riego, J. Andrzejewski, F. Mingrone, C. Lederer, Petar Žugec, W. Mondalaers, G. Giubrone, M. Mastromarco, Massimo Barbagallo, C. Carrapiço, Anton Wallner, T. J. Wright, M. Meaze, E. Berthoumieux, L. S. Leong, Roberto Losito, Jeri Kroll, A. Tsinganis, Nicola Colonna, Mario Weigand, Vasilis Vlachoudis, R. Sarmento, F. Gunsing, Cristian Massimi, M. Mirea, F. Calviño, H. Leeb, J. Perkowski, A. J. M. Plompen, 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, Ventura, A., and Mengoni, A.
Subjects: Physics, Nuclear reaction, Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, Nuclear and High Energy Physics, Large Hadron Collider, cross section, Fragment (computer graphics), Fission, Physics::Instrumentation and Detectors, Nuclear Theory, TOF, Nuclear data, 232Th, n_TOF, fission fragments, angular distribution, Nuclear physics, Cross section (physics), Angular distribution, neutron, Physics::Accelerator Physics, fission, Neutron, Nuclear Experiment, nuclear reactions
Abstract: The angular distribution of fragments emitted in neutron-induced fission of 232Th was measured in the white spectrum neutron beam at the n_TOF facility at CERN. A reaction chamber based on Parallel Plate Avalanche Counters (PPAC) was used, where the detectors and the targets have been tilted 45 degrees with respect to the neutron beam direction in order to cover the full angular range of the fission fragments. A GEANT4 simulation has been developed to study the setup efficiency. The data analysis and the preliminary results obtained for the 232Th(n,f) between fission threshold and 100 MeV are presented here., JRC.D.4-Standards for Nuclear Safety, Security and Safeguards
Published: 2014

102. Study of the 234U(n,f) fission fragment angular distribution at the CERN n_TOF facility

Author: Leal-Cidoncha, E., Duran, Ignacio, Paradela, C., Calviño Tavares, Francisco|||0000-0002-7198-4639, Cortés Rossell, Guillem Pere|||0000-0002-3648-5826, 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, Física [Àrees temàtiques de la UPC], Nuclear Theory, CERN, Nuclear physics, n_TOF, Física nuclear, Nuclear reaction, Nuclear Experiment
Abstract: The angular distribution of the f ssion fragments (FFAD) produced in neutron induced reactions of actinides have been measured with a fission detection setup based on parallel-plate avalanche counters (PPACs) at the Neutron Time-Of-Flight (n_TOF) facility at CERN. The main features of the setup and preliminary results are reported here for the 234U(n,f) reaction measurement showing a high concordance with previous data, while providing new results up to 100 MeV.
Published: 2014

103. 62Ni(n, g) and 63Ni(n, g) cross sections measured at the n_TOF facility at CERN

Author: Lederer, C., Massimi, C., Reifarth, R., Tlustos, L., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vermeulen, M. J., Versaci, R., Vlachoudis, V., Vlastou, R., Schumann, D., Ware, T., Weigand, M., Weiß, C., Wright, T. J., Žugec, P., Wallner, A., Altstadt, S., Andriamonje, S., Andrzejewski, J., Audouin, L., Barbagallo, M., Bécares, V., Bečvář, F., Berthoumieux, E., Belloni, F., Berthier, B., Billowes, J., Boccone, V., Bosnar, D., Brugger, M., Calviani, M., Calviño, F., Cano-Ott, D., Carrapiço, C., Colonna, N., Cerutti, F., Chiaveri, E., Chin, M., Cortés, G., Cortés-Giraldo, M. A., Dillmann, I., Domingo-Pardo, C., Duran, I., Dzysiuk, N., Eleftheriadis, C., Dressler, R., Fernández-Ordóñez, M., Ferrari, A., Fraval, K., Ganesan, S., García, A. R., Giubrone, G., Gómez-Hornillos, M. B., Gonçalves, I. F., González-Romero, E., Gramegna, F., Guerrero, C., Griesmayer, E., Gurusamy, P., Harrisopulos, S., Heil, M., Ioannides, K., Jenkins, D. G., Jericha, E., Kadi, Y., Karadimos, D., Korschinek, G., Gunsing, F., Krtička, M., Kroll, J., Langer, C., Lebbos, E., Leeb, H., Leong, L. S., Losito, R., Lozano, M., Manousos, A., Marganiec, J., Käppeler, F., Marrone, S., Martinez, T., Mastinu, P. F., Mastromarco, M., Meaze, M., Mendoza, E., Mengoni, A., Milazzo, P. M., Mingrone, F., Mirea, M., Kivel, N., Mondalaers, W., Paradela, C., Pavlik, A., Perkowski, J., Plag, R., Plompen, A., Praena, J., Quesada, J. M., Rauscher, T., Riego, A., Pignatari, M., Roman, F., Rubbia, C., Sarmento, R., Schillebeeckx, P., Schmidt, S., Tagliente, G., Tain, J. L., Tarrío, D., Tassan-Got, L., and Tsinganis, A.
Subjects: PRIRODNE ZNANOSTI. Fizika, 62Ni and 63Ni neutron capture cross section, n_TOF, MACS, ddc:530, Nuclear Experiment, NATURAL SCIENCES. Physics
Abstract: The cross section of the 62Ni(n, g) reaction was measured with the time-of-flight technique at the neutron time-of-flight facility n_TOF at CERN. Capture kernels of 42 resonances were analyzed up to 200 keV neutron energy and Maxwellian averaged cross sections (MACS) from kT = 5–100 keV were calculated. With a total uncertainty of 4.5%, the stellar cross section is in excellent agreement with the the KADoNiS compilation at kT = 30 keV, while being systematically lower up to a factor of 1.6 at higher stellar temperatures. The cross section of the 63Ni(n, g) reaction was measured for the first time at n_TOF. We determined unresolved cross sections from 10 to 270 keV with a systematic uncertainty of 17%. These results provide fundamental constraints on s-process production of heavier species, especially the production of Cu in massive stars, which serve as the dominant source of Cu in the solar system.
Published: 2014
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104. Measurements of neutron cross sections for advanced nuclear energy systems at n-TOF (CERN)

Author: Srinivasan Ganesan, M. Mirea, A. Hernández-Prieto, G. Vannini, H. Leeb, J. L. Tain, J. Perkowski, W. Mondalaers, V. Variale, Christoph Langer, F. Gunsing, G. Tagliente, N. Kivel, Rene Reifarth, A. Manousos, Cristian Massimi, Stefan Schmidt, A. Riego, T. J. Wright, J. M. Quesada, G. Cortes, J. Marganiec, M. Krtička, D. Tarrío, L. Tassan-Got, G. Giubrone, F. Calviño, C. Rubbia, Petar Žugec, A. K. Saxena, Arnaud Ferrari, T. Martinez, Roberto Losito, J. Billowes, F. Mingrone, J. Andrzejewski, F. Bečvář, Mario Weigand, M. Mastromarco, E. Chiaveri, P. F. Mastinu, E. Mendoza, F. Käppeler, Massimo Barbagallo, C. Carrapiço, Anton Wallner, Rugard Dressler, A. Pavlik, C. Lampoudis, D. Cano-Ott, A. Ventura, Peter Schillebeeckx, C. Lederer, N. Colonna, C. Domingo-Pardo, M. Diakaki, P. M. Milazzo, A. Tsinganis, R. Vlastou, E. Berthoumieux, Alberto Mengoni, M. Sabaté-Gilarte, L.S. Leong, I. F. Gonçalves, Vasilis Vlachoudis, E. Leal-Cidoncha, K. Fraval, S. Altstadt, C. Paradela, Fabio Belloni, C. Eleftheriadis, L. Audouin, V. Bécares, Thomas Rauscher, Damir Bosnar, D. Karadimos, P. Vaz, E. González-Romero, Y. Kadi, E. Jericha, Dorothea Schumann, M. P. W. Chin, C. Weiß, Carlos Guerrero, A. R. García, M. Brugger, M. J. Vermeulen, P. E. Koehler, S. Valenta, F. Cerutti, Marco Calviani, I. Duran, T. Ware, E. Griesmayer, Javier Praena, D. G. Jenkins, M. A. Cortés-Giraldo, Jeri Kroll, R. Sarmento, A. J. M. Plompen, Ventura, A., Mengoni, A., 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, Lunardi, S., Barbagallo, M., Colonna, N., Altstadt, S., Andrzejewski, J., Audouin, L., Bécares, V., Bečvář, F., Belloni, F., Berthoumieux, E., Billowes, J., Bosnar, D., Brugger, M., Calviani, M., Calviño, F., Cano-Ott, D., Carrapiço, C., Cerutti, F., Chiaveri, E., Chin, M., Cortés, G., Cortés-Giraldo, M.A., Diakaki, M., Domingo-Pardo, C., Duran, I., Dressler, R., Eleftheriadis, C., Ferrari, A., Fraval, K., Ganesan, S., García, A.R., Giubrone, G., Gonçalves, I.F., González-Romero, E., Griesmayer, E., Guerrero, C., Gunsing, F., Hernández-Prieto, A., Jenkins, D.G., Jericha, E., Kadi, Y., Käppeler, F., Karadimos, D., Kivel, N., Koehler, P., Krtička, M., Kroll, J., Lampoudis, C., Langer, C., Leal-Cidoncha, E., Lederer, C., Leeb, H., Leong, L.S., Losito, R., Manousos, A., Marganiec, J., Martínez, T., Massimi, C., Mastinu, P.F., Mastromarco, M., Mendoza, E., Milazzo, P.M., Mingrone, F., Mirea, M., Mondalaers, W., Paradela, C., Pavlik, A., Perkowski, J., Plompen, A., Praena, J., Quesada, J.M., Rauscher, T., Reifarth, R., Riego, A., Rubbia, C., Sabaté-Gilarte, M., Sarmento, R., Saxena, A., Schillebeeckx, P., Schmidt, S., Schumann, D., Tagliente, G., Tain, J.L., Tarrío, D., Tassan-Got, L., Tsinganis, A., Valenta, S., Vannini, G., Variale, V., Vaz, P., Vermeulen, M.J., Vlachoudis, V., Vlastou, R., Wallner, A., Ware, T., Weigand, M., Weiß, C., Wright, T., and Žugec, P.
Subjects: Nuclear reaction, Physics, Energies::Energia nuclear [Àrees temàtiques de la UPC], QC1-999, Nuclear Theory, Nuclear data, Nuclear energy, Neutron radiation, Nuclear physics, Uranium-236, Physics and Astronomy (all), Plutonium-242, Nuclear astrophysics, Neutron source, Energia nuclear, Physics::Accelerator Physics, Neutron, neutron cross sections, n_TOF, advanced nuclear energy systems, Nuclear Experiment
Abstract: The n-TOF facility operates at CERN with the aim of addressing the request of high accuracy nuclear data for advanced nuclear energy systems as well as for nuclear astrophysics. Thanks to the features of the neutron beam, important results have been obtained on neutron induced fission and capture cross sections of U, Pu and minor actinides. Recently the construction of another beam line has started; the new line will be complementary to the first one, allowing to further extend the experimental program foreseen for next measurement campaigns. © Owned by the authors, published by EDP Sciences, 2014.
Published: 2014

105. The (n, α) reaction in the s-process branching point 59Ni

Author: S. Valenta, Marco Calviani, R. Vlastou, Damir Bosnar, M. Meaze, M. J. Vermeulen, Srinivasan Ganesan, Mario Barbagallo, F. Gunsing, Cristian Massimi, F. Bečvář, V. Bécares, E. Jericha, Dorothea Schumann, C. Weiß, Mario Weigand, Alfredo Ferrari, M. Mirea, Rene Reifarth, M. B. Gómez-Hornillos, Stefan Schmidt, Vittorio Boccone, L. Audouin, H. Leeb, J. M. Quesada, P. M. Milazzo, S. Altstadt, J. Perkowski, Rugard Dressler, E. Chiaveri, D. Cano-Ott, G. Cortes, D. G. Jenkins, Laurent Tassan-Got, G. Giubrone, F. Käppeler, A. Tsinganis, C. Eleftheriadis, D. Tarrío, A. Hernández-Prieto, E. Mendoza, C. Lampoudis, Peter Schillebeeckx, R. Versaci, N. Dzysiuk, Yacine Kadi, Nicola Colonna, L.S. Leong, F. Mingrone, J. Andrzejewski, M. Kokkoris, P. Vaz, J. Billowes, Carlo Rubbia, M. Mastromarco, Alberto Ventura, E. Griesmayer, T. J. Wright, Cortés-Giraldo, C. Langer, V. Vlachoudis, A. Pavlik, Carlos Guerrero, C. Domingo-Pardo, N. Kivel, C. Carrapiço, Anton Wallner, M. Sabaté-Gilarte, A. K. Saxena, E. Berthoumieux, C. Paradela, P. Gurusamy, M. Diakaki, W. Mondalaers, A. Mallick, G. Vannini, Roberto Losito, Petar Žugec, A. Manousos, F. Cerutti, Javier Praena, Fabio Belloni, M. P. W. Chin, F. Roman, E. Leal-Cidoncha, I. Goncalves, G. Tagliente, Thomas Rauscher, D. Karadimos, A. R. García, M. Brugger, T. Ware, V. Variale, Robles, P. E. Koehler, Alberto Mengoni, J. L. Tain, I. Duran, A. Riego, Gerald Badurek, C. Lederer, J. Marganiec, P. F. Mastinu, M. Krtička, F. Calviño, T. Martinez, E. Gonzalez-Romero, K. Fraval, A. J. M. Plompen, Jeri Kroll, R. Sarmento, Ventura, A., Mengoni, A., 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 Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, n_TOF Collaboration, 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, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, Nuclear and High Energy Physics, Cross section, TOF, Resonance, Nuclear data, Diamond, Alpha particle, Neutron, engineering.material, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 59Ni, neutron capture, n_TOF, s-proces branching point, Nuclear physics, Nuclear reactins, engineering, Nuclear astrophysics, s-process, Embrittlement, Nucleosynthesis
Abstract: See paper for full list of authors; International audience; The (n, α) reaction in the radioactive 59Ni is of relevance in nuclear astrophysics as 59Ni can be considered as the first branching point in the astrophysical s-process. Its relevance in nuclear technology is especially related to material embrittlement in stainless steel. However, there is a discrepancy between available experimental data and the evaluated nuclear data files for this reaction. At the n_TOF facility at CERN, a dedicated system based on sCVD diamond diodes was set up to measure the 59Ni(n, α)56Fe cross section. The results of this measurement, with special emphasis on the dominant resonance at 203 eV, are presented here.
Published: 2014
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106. The CERN n_TOF Facility: Neutron Beams Performances for Cross Section Measurements

Author: F. Mingrone, J. Andrzejewski, C. Langer, N. Kivel, V. Bécares, C. Lederer, A. R. García, P. Gurusamy, G. Tagliente, M. Brugger, Rene Reifarth, E. Jericha, Stefan Schmidt, I. F. Gonçalves, M. Mastromarco, Vittorio Boccone, J. M. Quesada, Dorothea Schumann, L. Tassan-Got, J. L. Tain, S. Valenta, A. Mallick, G. Vannini, G. Cortes, T. J. Wright, D. Tarrío, Marco Calviani, Fabio Belloni, C. Carrapiço, Anton Wallner, C. Paradela, M. Krtička, L. Audouin, A. Hernández-Prieto, S. Altstadt, A. K. Saxena, Arnaud Ferrari, G. Giubrone, T. Martinez, A. Riego, Alberto Mengoni, E. Leal-Cidoncha, C. Eleftheriadis, Thomas Rauscher, V. Variale, W. Mondalaers, Petar Žugec, F. Cerutti, A. Manousos, Srinivasan Ganesan, F. Bečvář, F. Gunsing, D. Karadimos, J. Marganiec, Cristian Massimi, M. Meaze, M. J. Vermeulen, P. F. Mastinu, Mario Barbagallo, R. Versaci, E. Mendoza, E. González-Romero, M. B. Gómez-Hornillos, M. Kokkoris, Peter Schillebeeckx, N. Dzysiuk, J. Billowes, C. Weiss, R. Vlastou, M. P. W. Chin, Roberto Losito, D. G. Jenkins, Rugard Dressler, Damir Bosnar, Y. Kadi, Javier Praena, M. S. Robles, F. Roman, E. Berthoumieux, A. Tsinganis, F. Käppeler, P. M. Milazzo, Nicola Colonna, D. Cano-Ott, L.S. Leong, I. Duran, Vasilis Vlachoudis, M. Diakaki, M. A. Cortés-Giraldo, Mario Weigand, A. Ventura, K. Fraval, M. Mirea, F. Calviño, H. Leeb, J. Perkowski, P. E. Koehler, T. Ware, E. Griesmayer, Carlos Guerrero, A. J. M. Plompen, P. Vaz, Jeri Kroll, A. Pavlik, R. Sarmento, C. Domingo-Pardo, M. Sabaté-Gilarte, E. Chiaveri, C. Rubbia, C. Lampoudis, E. Chiaveri, S. Altstadt, J. Andrzejewski, L. Audouin, M. Barbagallo, V. Becare, F. Becvar, F. Belloni, E. Berthoumieux, J. Billowe, V. Boccone, D. Bosnar, M. Brugger, M. Calviani, F. Calvino, D. Cano-Ott, C. Carrapico, F. Cerutti, M. Chin, N. Colonna, G. Corte, M. A. Cortes-Giraldo, M. Diakaki, C. Domingo-Pardo, I. Duran, R. Dressler, N. Dzysiuk, C. Eleftheriadi, A. Ferrari, K. Fraval, S. Ganesan, A. R. Garcia, G. Giubrone, M. B. Gomez-Hornillo, I. F. Goncalve, E. Gonzalez-Romero, E. Griesmayer, C. Guerrero, F. Gunsing, P. Gurusamy, A. Hernandez-Prieto, D. G. Jenkin, E. Jericha, Y. Kadi, F. Kaeppeler, D. Karadimo, N. Kivel, P. Koehler, M. Kokkori, M. Krticka, J. Kroll, C. Lampoudi, C. Langer, E. Leal-Cidoncha, C. Lederer, H. Leeb, L. S. Leong, R. Losito, A. Mallick, A. Manouso, J. Marganiec, T. Martinez, C. Massimi, P. F. Mastinu, M. Mastromarco, M. Meaze, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, M. Mirea, W. Mondalaer, C. Paradela, A. Pavlik, J. Perkowski, A. Plompen, J. Praena, J. M. Quesada, T. Rauscher, R. Reifarth, A. Riego, M. S. Roble, F. Roman, C. Rubbia, M. Sabate-Gilarte, R. Sarmento, A. Saxena, P. Schillebeeckx, S. Schmidt, D. Schumann, G. Tagliente, J. L. Tain, D. Tarrio, L. Tassan-Got, A. Tsingani, S. Valenta, G. Vannini, V. Variale, P. Vaz, A. Ventura, R. Versaci, M. J. Vermeulen, V. Vlachoudi, R. Vlastou, A. Wallner, T. Ware, M. Weigand, C. Wei, T. Wright, P. Zugec, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Ventura, A., and Mengoni, A.
Subjects: Physics, Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, Nuclear and High Energy Physics, Large Hadron Collider, Cross section, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, TOF, CERN - n_TOF, n_TOF, CERN, cross section measurements, Nuclear data, Beam, Neutron, Neutron radiation, Nuclear physics, Cross section (physics), Neutron flux, High activity, Nuclear Experiment, Beam (structure)
Abstract: This paper presents the characteristics of the existing CERN n_TOF neutron beam facility (n_TOF-EAR1 with a flight path of 185 meters) and the future one (n_TOF EAR-2 with a flight path of 19 meters), which will operate in parallel from Summer 2014. The new neutron beam will provide a 25 times higher neutron flux delivered in 10 times shorter neutron pulses, thus offering more powerful capabilities for measuring small mass, low cross section and/or high activity samples., JRC.D.4-Standards for Nuclear Safety, Security and Safeguards
Published: 2014

107. Measurement of the neutron capture cross section of the fissile isotope 235U with the CERN n_TOF Total Absorption Calorimeter and a fission tagging based on micromegas detectors

Author: Mendoza, E., Cano-Ott, D, Balibrea-Correa, J., Calviño Tavares, Francisco|||0000-0002-7198-4639, Cortés Rossell, Guillem Pere|||0000-0002-3648-5826, Riego Pérez, Albert|||0000-0001-8571-1546, 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, Física [Àrees temàtiques de la UPC], Cross section, Astrophysics::High Energy Astrophysical Phenomena, CERN, n_TOF, Nuclear reaction, Neutrons--Captura, Reutrons, Nuclear Experiment, Neutrons--Capture
Abstract: Actual and future nuclear technologies require more accurate nuclear data on the (n, gamma) cross sections and -ratios of fissile isotopes. Their measurement presents several difficulties, mainly related to the strong fission gamma-ray background competing with the weaker gamma-ray cascades used as the experimental signature of the (n,gamma) process. A specific setup has been used at the CERN n_TOF facility in 2012 for the measurement of the (n,gamma) cross section and alpha-ratios of fissile isotopes and used for the case of the 235U isotope. The setup consists in a set of micromegas fission detectors surrounding 235U samples and placed inside the segmented BaF2 Total Absorption Calorimeter.
Published: 2014

108. Measurement of the 12C(n, p)12B cross section at n_TOF at CERN by in-beam activation analysis

Author: Žugec, Petar, Colonna, N., Bosnar, Damir, Mengoni, A., Altstadt, S., Andrzejewski, J., Audouin, L., Barbagallo, M., Becares, V., Bečvar, F., Belloni, F., Berthoumieux, E., Billowes, J., Boccone, V., Brugger, M., Calviani, M., Calvino, F., Cano-Ott, D., Carrapico, C., Cerutti, F., Chiaveri, E., Chin, M., Cortes, G., Cortes-Giraldo, M. A., Cosentino, L., Diakaki, M., Domingo-Pardo, C., Dressler, R., Duran, I., Eleftheriadis, C., Ferrari, A., Finocchiaro, P., Fraval, K., Ganesan, S., Garcia, A. R., Giubrone, G., Gomez-Hornillos, M. B., Goncalves, I. F., Gonzalez-Romero, E., Griesmayer, E., Guerrero, C., Gunsing, F., Gurusamy, P., Heinitz, S., Jenkins, D. G., Jericha, E., Kappeler, F., Karadimos, D., Kivel, N., Kokkoris, M., Krtička, M., Kroll, J., Langer, C., Lederer, C., Leeb, H., Leong, L. S., Lo Meo, S., Losito, R., Manousos, A., Marganiec, J., Martinez, T., Massimi, C., Mastinu, P., Mastromarco, M., Mendoza, E., Milazzo, P. M., Mingrone, F., Mirea, M., Mondalaers, W., Musumarra, A., Paradela, C., Pavlik, A., Perkowski, J., Plompen, A., Praena, J., Quesada, J., Rauscher, T., Reifarth, R., Riego, A., Roman, F., Rubbia, C., Sarmento, R., Saxena, A., Schillebeeckx, P., Schmidt, S., Schumann, D., Tagliente, G., Tain, J. L., Tarrio, D., Tassan-Got, 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., and Wright, T.
Subjects: p)12B cross section, PRIRODNE ZNANOSTI. Fizika, 12C(n, n_TOF, in-beam activation, Nuclear Experiment, NATURAL SCIENCES. Physics
Abstract: The integral cross section of the 12C(n, p)12B reaction has been determined for the first time in the neutron energy range from threshold to several GeV at the n_TOF facility at CERN. The measurement relies on the activation technique with the β decay of 12B measured over a period of four half-lives within the same neutron bunch in which the reaction occurs. The results indicate that model predictions, used in a variety of applications, are mostly inadequate. The value of the integral cross section reported here can be used as a benchmark for verifying or tuning model calculations.
Published: 2014
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109. Neutron Capture Reactions on Fe and Ni Isotopes for the Astrophysical s-process

Author: A. R. García, M. Brugger, C. Eleftheriadis, Thomas Rauscher, D. Karadimos, E. González-Romero, M. P. W. Chin, T. Ware, F. Roman, E. Griesmayer, E. Chiaveri, J. L. Tain, P. F. Mastinu, Marco Pignatari, S. Valenta, G. Giubrone, J. Billowes, G. Tagliente, Mario Weigand, Marco Calviani, Srinivasan Ganesan, F. Käppeler, M. B. Gómez-Hornillos, P. E. Koehler, E. Jericha, P. Vaz, C. Lederer, M. Mirea, Mario Barbagallo, D. Cano-Ott, Dorothea Schumann, S. Altstadt, M. Diakaki, Jeri Kroll, C. Weiß, A. Pavlik, C. Domingo-Pardo, N. Kivel, F. Bečvář, H. Leeb, Alberto Mengoni, Javier Praena, R. Sarmento, A. Manousos, A. J. M. Plompen, E. Mendoza, Arnaud Ferrari, A. Riego, M. Meaze, Peter Schillebeeckx, M. J. Vermeulen, M. A. Cortés-Giraldo, N. Dzysiuk, J. Perkowski, J. Marganiec, P. Gurusamy, K. Fraval, Carlos Guerrero, I. Duran, P. M. Milazzo, C. Rubbia, M. Krtička, F. Calviño, I. F. Gonçalves, F. Cerutti, V. Bécares, R. Vlastou, F. Gunsing, T. Martinez, M. Mastromarco, M. Kokkoris, Damir Bosnar, Y. Kadi, G. Cortes, C. Carrapiço, Anton Wallner, Cristian Massimi, D. Tarrío, Fabio Belloni, D. G. Jenkins, E. Berthoumieux, G. Vannini, Petar Žugec, W. Mondelaers, V. Variale, Roberto Versaci, F. Mingrone, J. Andrzejewski, T. J. Wright, C. Langer, Roberto Losito, Rugard Dressler, A. Tsinganis, Nicola Colonna, L.S. Leong, Vasilis Vlachoudis, A. Ventura, Gunther Korschinek, C. Paradela, Rene Reifarth, Stefan Schmidt, L. Audouin, Vittorio Boccone, J. M. Quesada, L. Tassan-Got, Ventura, A., Mengoni, A., 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, 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 Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, C. Lederer, G. Giubrone, C. Massimi, P. Zugec, M. Barbagallo, N. Colonna, C. Domingo-Pardo, C. Guerrero, F. Gunsing, F. Kaeppeler, J. L. Tain, S. Altstadt, J. Andrzejewski, L. Audouin, V. Becare, F. Becvar, F. Belloni, E. Berthoumieux, J. Billowe, V. Boccone, D. Bosnar, M. Brugger, M. Calviani, F. Calvino, D. Cano-Ott, C. Carrapico, F. Cerutti, E. Chiaveri, M. Chin, G. Corte, M. A. Cortes-Giraldo, M. Diakaki, I. Duran, R. Dressler, N. Dzysiuk, C. Eleftheriadi, A. Ferrari, K. Fraval, S. Ganesan, A. R. Garcia, M. B. Gomez-Hornillo, I. F. Goncalve, E. Gonzalez-Romero, E. Griesmayer, P. Gurusamy, D. G. Jenkin, E. Jericha, Y. Kadi, D. Karadimo, N. Kivel, P. Koehler, M. Kokkori, G. Korschinek, M. Krticka, J. Kroll, C. Langer, H. Leeb, L. S. Leong, R. Losito, A. Manouso, J. Marganiec, T. Martinez, P. F. Mastinu, M. Mastromarco, M. Meaze, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, M. Mirea, W. Mondelaer, C. Paradela, A. Pavlik, J. Perkowski, M. Pignatari, A. Plompen, J. Praena, J. M. Quesada, T. Rauscher, R. Reifarth, A. Riego, F. Roman, C. Rubbia, R. Sarmento, P. Schillebeeckx, S. Schmidt, D. Schumann, G. Tagliente, D. Tarrio, L. Tassan-Got, A. Tsingani, S. Valenta, G. Vannini, V. Variale, P. Vaz, A. Ventura, R. Versaci, M. J. Vermeulen, V. Vlachoudi, R. Vlastou, A. Wallner, T. Ware, M. Weigand, C. Wei, T. J. Wright, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear and High Energy Physics, Astrophysics::High Energy Astrophysical Phenomena, RADIATIVE NEUTRON CAPTURE, Nuclear Theory, Neutron, Neutron scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Nuclear physics, neutron capture, n_TOF, s-process, Neutron cross section, Nuclear Experiment, capture, Physics, Neutrons, Energies::Energia nuclear [Àrees temàtiques de la UPC], Cross section, TOF, NEUTRON TIME OF FLIGHT, Neutron temperature, Neutron capture, Neutron source, r-process, S PROCESS, Nuclear reactions, Nucleosynthesis
Abstract: See paper for full list of authors; Neutron capture cross sections in the keV neutron energy region are the key nuclear physics input to study the astrophysical slow neutron capture process. In the past years, a series of neutron capture cross section measurements has been performed at the neutron time-of-flight facility n_TOF at CERN focussing on the Fe/Ni mass region. Recent results and future developments in the neutron time-of-flight technique are discussed.
Published: 2014
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110. Experimental neutron capture data of 58Ni from the CERN n_TOF facility

Author: TOF Collaboration, ��ugec, P., Barbagallo, M., Colonna, N., Bosnar, D., Altstadt, S., Andrzejewski, J., Audouin, L., B��cares, V., Be��v��, F., Belloni, F., Berthoumieux, E., Billowes, J., Boccone, V., Brugger, M., Calviani, M., Calvi��o, F., Cano-Ott, D., Carrapi��o, C., Cerutti, F., Chiaveri, E., Chin, M., Cort��s, G., Cort��s-Giraldo, M. A., Diakaki, M., Domingo-Pardo, C., Duran, I., Dzysiuk, N., Eleftheriadis, C., Ferrari, A., Fraval, K., Ganesan, S., Garc��a, A. R., Giubrone, G., G��mez-Hornillos, M. B., Gon��alves, I. F., Gonz��lez-Romero, E., Griesmayer, E., Guerrero, C., Gunsing, F., Gurusamy, P., Jenkins, D. G., Jericha, E., Kadi, Y., K��ppeler, F., Karadimos, D., Koehler, P., Kokkoris, M., Krti��ka, M., Kroll, J., Langer, C., Lederer, C., Leeb, H., Leong, L. S., Losito, R., Manousos, A., Marganiec, J., Mart��nez, T., Massimi, C., Mastinu, P. F., Mastromarco, M., Meaze, M., Mendoza, E., Mengoni, A., Milazzo, P. M., Mingrone, F., Mirea, M., Mondalaers, W., Paradela, C., Pavlik, A., Perkowski, J., Pignatari, M., Plompen, A., Praena, J., Quesada, J. M., Rauscher, T., Reifarth, R., Riego, A., Roman, F., Rubbia, C., Sarmento, R., Schillebeeckx, P., Schmidt, S., Tagliente, G., Tain, J. L., Tarr��o, D., Tassan-Got, 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., Wei��, C., Wright, T., 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 Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, nTOF, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, National Science Foundation (NSF). United States, Joint Institute for Nuclear Astrophysics (JINA) U.S., 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, Ventura, A., Mengoni, A., P. Zugec, M. Barbagallo, N. Colonna, D. Bosnar, S. Altstadt, J. Andrzejewski, L. Audouin, V. Becare, F. Becvar, F. Belloni, E. Berthoumieux, J. Billowe, V. Boccone, M. Brugger, M. Calviani, F. Calvino, D. Cano-Ott, C. Carrapico, F. Cerutti, E. Chiaveri, M. Chin, G. Corte, M. A. Cortes-Giraldo, M. Diakaki, C. Domingo-Pardo, I. Duran, N. Dzysiuk, C. Eleftheriadi, A. Ferrari, K. Fraval, S. Ganesan, A. R. Garcia, G. Giubrone, M. B. Gomez-Hornillo, I. F. Goncalve, E. Gonzalez-Romero, E. Griesmayer, C. Guerrero, F. Gunsing, P. Gurusamy, D. G. Jenkin, E. Jericha, Y. Kadi, F. Kaeppeler, D. Karadimo, P. Koehler, M. Kokkori, M. Krticka, J. Kroll, C. Langer, C. Lederer, H. Leeb, L. S. Leong, R. Losito, A. Manouso, J. Marganiec, T. Martinez, C. Massimi, P. F. Mastinu, M. Mastromarco, M. Meaze, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, M. Mirea, W. Mondalaer, C. Paradela, A. Pavlik, J. Perkowski, M. Pignatari, A. Plompen, J. Praena, J. M. Quesada, T. Rauscher, R. Reifarth, A. Riego, F. Roman, C. Rubbia, R. Sarmento, P. Schillebeeckx, S. Schmidt, G. Tagliente, J. L. Tain, D. Tarrio, L. Tassan-Got, A. Tsingani, S. Valenta, G. Vannini, V. Variale, P. Vaz, A. Ventura, R. Versaci, M. J. Vermeulen, V. Vlachoudi, R. Vlastou, A. Wallner, T. Ware, M. Weigand, C. Wei, T. Wright, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear and High Energy Physics, nTOF, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, NEUTRON RESONANCE ANALYSIS, Neutron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, Time of flight, 58Ni neutron capture cross section, n_TOF, MACS, 0103 physical sciences, Neutron cross section, Física::Electromagnetisme [Àrees temàtiques de la UPC], Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, Neutrons, Large Hadron Collider, Cross section, 010308 nuclear & particles physics, CERN - n_TOF, Resonance, Física, NEUTRON TIME OF FLIGHT, Neutron temperature, Neutron capture, Neutrons Capture, S PROCESS, s-process
Abstract: The $^{58}$Ni $(n,\gamma)$ cross section has been measured at the neutron time of flight facility n_TOF at CERN, in the energy range from 27 meV up to 400 keV. In total, 51 resonances have been analyzed up to 122 keV. Maxwellian averaged cross sections (MACS) have been calculated for stellar temperatures of kT$=$5-100 keV with uncertainties of less than 6%, showing fair agreement with recent experimental and evaluated data up to kT = 50 keV. The MACS extracted in the present work at 30 keV is 34.2$\pm$0.6$_\mathrm{stat}\pm$1.8$_\mathrm{sys}$ mb, in agreement with latest results and evaluations, but 12% lower relative to the recent KADoNIS compilation of astrophysical cross sections. When included in models of the s-process nucleosynthesis in massive stars, this change results in a 60% increase of the abundance of $^{58}$Ni, with a negligible propagation on heavier isotopes. The reason is that, using both the old or the new MACS, 58Ni is efficiently depleted by neutron captures., Comment: 10 pages, 8 figures, 5 tables
Published: 2014
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111. A Micromegas Detector for Neutron Beam Imaging at the n_TOF Facility at CERN

Author: Stefan Schmidt, C. Eleftheriadis, Thomas Rauscher, Vittorio Boccone, J. M. Quesada, L. Tassan-Got, D. Karadimos, V. Variale, C. Lederer, Arnaud Ferrari, K. Fraval, E. González-Romero, S. Andriamonje, M. Krtička, F. Calviño, A. Manousos, E. Berthoumieux, J. Pancin, F. Gunsing, P. F. Mastinu, A. Pavlik, C. Weiss, R. Vlastou, J. Marganiec, A. Tsinganis, T. Ware, Cristian Massimi, A. R. García, A. Ventura, V. Bécares, Nicola Colonna, L.S. Leong, G. Cortes, C. Domingo-Pardo, Damir Bosnar, G. Tagliente, Vasilis Vlachoudis, M. B. Gómez-Hornillos, M. Brugger, Y. Kadi, D. Tarrío, J. Billowes, R. Versaci, E. Griesmayer, W. Mondalaers, Y. Giomataris, M. Kokkoris, M. Kebbiri, P. Gurusamy, Roberto Losito, T. Papaevangelou, M. P. W. Chin, Srinivasan Ganesan, M. Mirea, I. F. Gonçalves, G. Giubrone, F. Roman, P. M. Milazzo, D. G. Jenkins, F. Bečvář, G. Vannini, M.A. Corté-Giraldo, M. Meaze, D. Cano-Ott, M. J. Vermeulen, M. Mastromarco, F. Mingrone, H. Leeb, J. Andrzejewski, Fabio Belloni, M. Diakaki, A. Riego, Mario Barbagallo, E. Mendoza, J. Perkowski, C. Paradela, S. Valenta, C. Carrapiço, Anton Wallner, C. Langer, E. Jericha, Peter Schillebeeckx, P. E. Koehler, Marco Calviani, L. Audouin, N. Dzysiuk, Mario Weigand, P. Vaz, S. Altstadt, E. Chiaveri, T. Marítnez, I. Duran, T. J. Wright, F. Käppeler, Petar Žugec, Carlos Guerrero, A. J. M. Plompen, F.J. Iguaz, Jeri Kroll, R. Sarmento, Javier Praena, Alberto Mengoni, F. Cerutti, C. Rubbia, J. L. Tain, Rene Reifarth, 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, Ventura, A., and Mengoni, A.
Subjects: Physics, Bonner sphere, Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, MicroMegas detector, Detector, Neutron, Neutron radiation, MGAS, n_TOF, neutron beam imaging, 7. Clean energy, 01 natural sciences, Neutron time-of-flight scattering, Neutron temperature, Nuclear physics, 13. Climate action, 0103 physical sciences, Neutron detection, Nuclear reactions, 010306 general physics, Nuclear Experiment, Beam (structure)
Abstract: Micromegas (Micro-MEsh Gaseous Structure) detectors are gas detectors consisting of a stack of one ionization and one proportional chamber. A micromesh separates the two communicating regions, where two different electric fields establish respectively a charge drift and a charge multiplication regime. The n_TOF facility at CERN provides a white neutron beam (from thermal up to GeV neutrons) for neutron induced cross section measurements. These measurements need a perfect knowlodge of the incident neutron beam, in particular regarding its spatial profile. A position sensitive micromegas detector equipped with a 10B based neutron/charged particle converter has been extensively used at the n_TOF facility for characterizing the neutron beam profile and extracting the beam interception factor for samples of different size. The boron converter allowed to scan the energy region of interest for neutron induced capture reactions as a function of the neutron energy, determined by the time of flight. Experimental results will be presented and compared to simulations, performed by means of the FLUKA code., JRC.D.4-Standards for Nuclear Safety, Security and Safeguards
Published: 2014

112. Measurement of the neutron capture cross section of the fissile isotope 235U with the CERN n_TOF total absorption calorimeter and a fission tagging based on micromegas detectors

Author: D. Cano-Ott, P. Vaz, A. R. García, A. J. M. Plompen, A. Pavlik, Carlos Guerrero, F. Mingrone, J. Andrzejewski, C. Domingo-Pardo, S. Valenta, F. Belloni, M. Mirea, M. B. Gómez-Hornillos, Christoph Langer, M. Brugger, W. Mondelaers, A. Riego, Marco Calviani, Roberto Losito, Rugard Dressler, G. Cortes, F. Käppeler, A. Manousos, I. Duran, Petar Žugec, Srinivasan Ganesan, V. Variale, I. F. Gonçalves, D. Tarrío, H. Leeb, J. Perkowski, A. Tsinganis, Arnaud Ferrari, M. A. Cortés-Giraldo, J. L. Tain, C. Eleftheriadis, J. Marganiec, Javier Praena, K. Fraval, Thomas Rauscher, F. Gunsing, A. Ventura, Nicola Colonna, L.S. Leong, Mario Barbagallo, Vasilis Vlachoudis, M. Mastromarco, I. Stetcu, Damir Bosnar, Y. Kadi, T. Ware, C. Paradela, L. Audouin, M. Krtička, F. Calviño, C. Carrapiço, Cristian Massimi, E. Griesmayer, J. Billowes, N. Kivel, D. Karadimos, R. Versaci, F. Cerutti, Jeri Kroll, Anton Wallner, T. Martinez, G. Vannini, M. Kokkoris, G. Giubrone, R. Sarmento, P. Gurusamy, E. González-Romero, C. Rubbia, M. Meaze, M. J. Vermeulen, C. Lederer, J. Balibrea, P. E. Koehler, A. Mengoni, E. Chiaveri, P. F. Mastinu, M. Sabaté, Rene Reifarth, Stefan Schmidt, Marco Pignatari, M. Diakaki, T. J. Wright, Vittorio Boccone, J. M. Quesada, L. Tassan-Got, M. P. W. Chin, Mario Weigand, C. Lampoudis, F. Roman, G. Tagliente, R. Vlastou, E. Berthoumieux, D. G. Jenkins, S. Altstadt, V. Bécares, F. Bečvář, Peter Schillebeeckx, N. Dzysiuk, Toshihiko Kawano, E. Jericha, Dorothea Schumann, C. Weiß, P. M. Milazzo, E. Mendoza, Gunther Korschinek, 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, Ventura, A., and Mengoni, A.
Subjects: Physics, Nuclear reaction, Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, Nuclear and High Energy Physics, Isotope, Fissile material, Cross section, Fission, Physics::Instrumentation and Detectors, TOF, Nuclear data, MicroMegas detector, Neutron, 235U, neutron capture, n_TOF, TAC, MGAS, Nuclear physics, Neutron cross section, Nuclear reactions, Nuclear Experiment
Abstract: Current and future nuclear technologies require more accurate nuclear data on (n,γ) cross sections and the α-ratios of fissile isotopes. Their measurement presents several difficulties, mainly related to the strong fission γ-ray background competing with the weaker γ-ray cascades used as the experimental signature of the (n,γ) process. A specific setup was used at the CERN n TOF facility in 2012 for the measurement of the (n,γ) cross section and α-ratios of fissile isotopes and used for the case of the 235U isotope. The setup consists of a set of micromegas fission detectors surrounding the 235U samples all placed inside a segmented BaF2 Total Absorption Calorimeter., JRC.D.4-Standards for Nuclear Safety, Security and Safeguards
Published: 2014

113. Neutron cross-sections for advanced nuclear systems: the n_TOF project at CERN

Author: Barbagallo, M., Bosnar, Damir, Žugec, Petar, and L. Sarkadi, N. Kroó, N. Armaroli, J. Ongena, A. McEvoy, Z. Fülöp
Subjects: Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, neutron cross sections, n_TOF, nuclear systems, Nuclear Experiment
Abstract: The study of neutron-induced reactions is of high relevance in a wide variety of fields, ranging from stellar nucleosynthesis and fundamental nuclear physics to applications of nuclear technology. In nuclear energy, high accuracy neutron data are needed for the development of Generation IV fast reactors and accelerator driven systems, these last aimed specifically at nuclear waste incineration, as well as for research on innovative fuel cycles. In this context, a high luminosity Neutron Time Of Flight facility, n_TOF, is operating at CERN since more than a decade, with the aim of providing new, high accuracy and high resolution neutron cross-sections. Thanks to the features of the neutron beam, a rich experimental program relevant to nuclear technology has been carried out so far. The program will be further expanded in the near future, thanks in particular to a new high-flux experimental area, now under construction.
Published: 2014

114. Neutron cross-sections for advanced nuclear systems: The n-TOF project at CERN

Author: G. Tagliente, V. Variale, F. Cerutti, Mario Weigand, M. P. W. Chin, Y. Kadi, C. Lederer, R. Vlastou, E. Chiaveri, C. Paradela, G. Giubrone, P. F. Mastinu, E. Berthoumieux, A. Manousos, S. Valenta, P. Vaz, L. Audouin, Rugard Dressler, Marco Calviani, M. Mirea, Christoph Langer, J. Marganiec, A. Tsinganis, T. Ware, F. Mingrone, J. Andrzejewski, Javier Praena, Petar Žugec, S. Altstadt, A. Ventura, E. Leal-Cidoncha, A. K. Saxena, Arnaud Ferrari, Srinivasan Ganesan, M. Krtička, E. Jericha, C. Eleftheriadis, F. Calviño, E. Griesmayer, L.S. Leong, H. Leeb, Vasilis Vlachoudis, F. Käppeler, Dorothea Schumann, C. Weiß, F. Bečvář, T. Martinez, J. Perkowski, J. Billowes, E. Mendoza, I. F. Gonçalves, M. A. Cortés-Giraldo, M. J. Vermeulen, M. Mastromarco, F. Gunsing, Peter Schillebeeckx, C. Lampoudis, A. Hernández-Prieto, Massimo Barbagallo, Thomas Rauscher, N. Colonna, D. Bosnar, C. Carrapiço, Cristian Massimi, Anton Wallner, Fabio Belloni, D. Karadimos, A. Riego, Jeri Kroll, Roberto Losito, V. Bécares, I. Duran, E. González-Romero, T. J. Wright, D. Cano-Ott, Rene Reifarth, R. Sarmento, K. Fraval, A. J. M. Plompen, M. Diakaki, A. R. García, W. Mondalaers, Carlos Guerrero, M. Brugger, A. Pavlik, C. Domingo-Pardo, D. G. Jenkins, M. Sabaté-Gilarte, P. E. Koehler, P. M. Milazzo, G. Cortes, D. Tarrío, G. Vannini, C. Rubbia, Stefan Schmidt, J. M. Quesada, L. Tassan-Got, Alberto Mengoni, J. L. Tain, Niko Kivel, Sarkadi, L., Barbagallo, M, Mastromarco, M., Colonna, N., Altstadt, S., Andrzejewski, J., Audouin, L., Bécares, V., Bečvář, F., Belloni, F., Berthoumieux, E., Billowes, J., Bosnar, D., Brugger, M., Calviani, M., Calviño, F., Cano-Ott, D., Carrapiço, C., Cerutti, F., Chiaveri, E., Chin, M., Cortés, G., Cortés-Giraldo, M.A., Diakaki, M., Domingo-Pardo, C., Duran, I., Dressler, R., Eleftheriadis, C., Ferrari, A., Fraval, K., Ganesan, S., García, A.R., Giubrone, G., Gonçalves, I.F., González-Romero, E., Griesmayer, E., Guerrero, C., Gunsing, F., Hernández-Prieto, A., Jenkins, D.G., Jericha, E., Kadi, Y., Käppeler, F., Karadimos, D., Kivel, N., Koehler, P., Krtička, M., Kroll, J., Lampoudis, C., Langer, C., Leal-Cidoncha, E., Lederer, C., Leeb, H., Leong, L.S., Losito, R., Manousos, A., Marganiec, J., Martínez, T., Massimi, C., Mastinu, P.F., Mendoza, E., Mengoni, A., Milazzo, P.M., Mingrone, F., Mirea, M., Mondalaers, W., Paradela, C., Pavlik, A., Perkowski, J., Plompen, A., Praena, J., Quesada, J.M., Rauscher, T., Reifarth, R., Riego, A., Rubbia, C., Sabaté-Gilarte, M., Sarmento, R., Saxena, A., Schillebeeckx, P., Schmidt, S., Schumann, D., Tagliente, G., Tain, J.L., Tarrío, D., Tassan-Got, L., Tsinganis, A., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vermeulen, M.J., Vlachoudis, V., Vlastou, R., Wallner, A., Ware, T., Weigand, M., Weiss, C., Wright, T., Žugec, P., Universitat Politècnica de Catalunya. Departament de Física, and Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group
Subjects: Nuclear reaction, Computer science, Nuclear engineering, QC1-999, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Nuclear physics, Context (language use), Neutron, 7. Clean energy, 01 natural sciences, Physics and Astronomy (all), Stellar nucleosynthesis, CERN, 0103 physical sciences, n_TOF, 010306 general physics, Nuclear Experiment, Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, Large Hadron Collider, Física [Àrees temàtiques de la UPC], 010308 nuclear & particles physics, Physics, Radioactive waste, Neutron radiation, Engineering physics, Nuclear technology, Time of flight facility, Física nuclear, Nuclear reactions
Abstract: The study of neutron-induced reactions is of high relevance in a wide variety of fields, ranging from stellar nucleosynthesis and fundamental nuclear physics to applications of nuclear technology. In nuclear energy, high accuracy neutron data are needed for the development of Generation IV fast reactors and accelerator driven systems, these last aimed specifically at nuclear waste incineration, as well as for research on innovative fuel cycles. In this context, a high luminosity Neutron Time Of Flight facility, n-TOF, is operating at CERN since more than a decade, with the aim of providing new, high accuracy and high resolution neutron cross-sections. Thanks to the features of the neutron beam, a rich experimental program relevant to nuclear technology has been carried out so far. The program will be further expanded in the near future, thanks in particular to a new high-flux experimental area, now under construction.
Published: 2014

115. Neutron studies for advanced reactors at n_TOF (CERN)

Author: Tagliente, G., Bosnar, Damir, and Žugec, Petar
Subjects: Nuclear Theory, Nuclear Experiment, n_TOF, neutron induced reactions, advanced nuclear reactors
Abstract: The neutron time-of-flight facility n_TOF at CERN has been designed to produce cross section data for neutron induced reactions in the neutron energy range from thermal to GeV. In the first ten years of operation, the facility has produced a large body of new and accurate data on neutron capture and fission cross-sections, relevant to nuclear astrophysics and advanced nuclear technologies. In 2014 a second experimental area, with a shorted flight path, will be available. It will allow to perform high flux measurements of isotopes of relatively short half-life, very low-cross sections, or available in very small quantities. The main results obtained so far at n_TOF and the future perspectives are here presented.
Published: 2014

116. Measurement and Analysis of 241Am(n,γ) Cross Sections with C6D6 Detectors at the n TOF Facility at CERN

Author: C. Eleftheriadis, Damir Bosnar, Thomas Rauscher, A. Manousos, Y. Kadi, C. Paradela, L. Audouin, W. Mondalaers, G. Vannini, I. F. Gonçalves, D. Karadimos, R. Versaci, Srinivasan Ganesan, J. Marganiec, P. Vaz, M. Kokkoris, D. G. Jenkins, E. González-Romero, A. Riego, A. Mengoni, Fabio Belloni, M. P. W. Chin, Mario Weigand, T. J. Wright, M. Meaze, I. Duran, M. J. Vermeulen, M. Krtička, E. Jericha, F. Roman, M. Mirea, Mario Barbagallo, Petar Žugec, S. Valenta, J. Billowes, C. Weiß, A. Pavlik, A. Ventura, M. A. Cortés-Giraldo, Marco Calviani, C. Domingo-Pardo, M. B. Gómez-Hornillos, G. Giubrone, Christoph Langer, V. Variale, F. Käppeler, T. Martinez, Roberto Losito, F. Calviño, C. Lederer, T. Ware, H. Leeb, G. Cortes, A. R. García, Arnaud Ferrari, S. Altstadt, P. M. Milazzo, G. Tagliente, Rene Reifarth, D. Tarrío, E. Griesmayer, J. Perkowski, M. Mastromarco, F. Mingrone, M. Brugger, J. Andrzejewski, Stefan Schmidt, A. Tsinganis, C. Carrapiço, V. Bécares, F. Gunsing, P. Gurusamy, Anton Wallner, Vittorio Boccone, J. M. Quesada, Nicola Colonna, L.S. Leong, Vasilis Vlachoudis, L. Tassan-Got, P. E. Koehler, Cristian Massimi, F. Bečvář, D. Cano-Ott, K. Fraval, M. Diakaki, E. Mendoza, Peter Schillebeeckx, N. Dzysiuk, E. Chiaveri, P. F. Mastinu, Javier Praena, C. Rubbia, Carlos Guerrero, A. J. M. Plompen, F. Cerutti, Jeri Kroll, R. Sarmento, J. L. Tain, R. Vlastou, E. Berthoumieux, Ventura, A., Mengoni, A., 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, Nuclear reaction, Neutrons, Energies::Energia nuclear [Àrees temàtiques de la UPC], Nuclear and High Energy Physics, Range (particle radiation), Large Hadron Collider, Cross section, TOF, Capture, Nuclear data, 241Am, neutron capture, n_TOF, Neutron, Scintillator, Resonance (particle physics), Nuclear physics, Cross section (physics), Nuclear reactions
Abstract: The 241Am(n,gamma) cross sections have been measured at the n TOF facility at CERN using C6D6 liquid scintillators and time of flight spectrometry. The results in the resolved resonance range bring new constraints to evaluations below 150 eV, and the energy upper limit can be extended from 150 eV to 320 eV. The analysis goes from thermal energy to 150 keV, and the unresolved resonance range cross section turns out to be larger than expected by evaluations or otherwise measured by previous works. The thermal cross section is found to be σth = 740 ± 74 barns, which is larger than expected by evaluations and most previous measurements., JRC.D.4-Standards for Nuclear Safety, Security and Safeguards
Published: 2014

117. Measurement of the 238U Radiative Capture Cross Section with C6D6 at the CERN n_TOF Facility

Author: Rene Reifarth, A. J. M. Plompen, Stefan Schmidt, Srinivasan Ganesan, J. M. Quesada, L. Tassan-Got, F. Mingrone, J. Andrzejewski, Mario Barbagallo, Mario Weigand, G. Giubrone, P. Vaz, J. Billowes, M. Mirea, A. Hernández-Prieto, C. Paradela, N. Kivel, L. Audouin, Rugard Dressler, M. S. Robles, M. A. Cortés-Giraldo, G. Tagliente, A. K. Saxena, E. Jericha, A. Tsinganis, Dorothea Schumann, H. Leeb, A. Pavlik, M. Mastromarco, C. Domingo-Pardo, Arnaud Ferrari, C. Weiß, Nicola Colonna, L.S. Leong, Vasilis Vlachoudis, J. Perkowski, C. Carrapiço, M. Sabaté-Gilarte, D. Cano-Ott, S. Valenta, M. Diakaki, K. Fraval, A. Ventura, R. Vlastou, F. Gunsing, Marco Calviani, Anton Wallner, V. Bécares, Jeri Kroll, Cristian Massimi, E. Berthoumieux, W. Mondalaers, A. R. García, A. Manousos, Roberto Losito, P. M. Milazzo, F. Cerutti, R. Sarmento, E. Chiaveri, P. F. Mastinu, J. Marganiec, C. Lampoudis, M. Kokkoris, M. Brugger, Carlos Guerrero, I. F. Gonçalves, M. Krtička, M. J. Vermeulen, F. Calviño, T. Martinez, T. J. Wright, Petar Žugec, Damir Bosnar, Y. Kadi, F. Käppeler, Javier Praena, D. G. Jenkins, Fabio Belloni, S. Altstadt, F. Bečvář, E. Mendoza, Peter Schillebeeckx, E. Leal-Cidoncha, C. Eleftheriadis, Thomas Rauscher, D. Karadimos, E. González-Romero, A. Mengoni, M. P. W. Chin, A. Riego, V. Variale, Christoph Langer, C. Lederer, P. E. Koehler, I. Duran, T. Ware, E. Griesmayer, A. Mallick, G. Vannini, G. Cortes, D. Tarrío, C. Rubbia, J. L. Tain, 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, Ventura, A., and Mengoni, A.
Subjects: Physics, Nuclear reaction, Neutrons, Energies::Energia nuclear [Àrees temàtiques de la UPC], Nuclear and High Energy Physics, Scintillation, Large Hadron Collider, Cross section, Physics::Instrumentation and Detectors, TOF, Nuclear data, Neutron, 238U, neutron capture, n_TOF, C6D6, Nuclear physics, Cross section (physics), Neutron capture, Time of flight, Nuclear reactions, Nuclear Experiment
Abstract: We present the preliminary results of the 238U(n,γ) reaction cross section measurement, performed on April 2012 at the CERN n_TOF facility using C6D6 scintillation detectors over an energy range from thermal to 1 MeV. The goal of this measurement, which is part of a larger proposal, is to reach an uncertainty of 2% in the cross section. The experimental set-up and the methods used to obtain this result are described., JRC.D.4-Standards for Nuclear Safety, Security and Safeguards
Published: 2014
Full Text: View/download PDF

118. GEANT4 simulation of the neutron background of the C6D6 set-up for capture studies at n_TOF

Author: collaboration, n_TOF, Žugec, P., Colonna, N., Bosnar, D., Altstadt, S., Andrzejewski, J., Audouin, L., Barbagallo, M., Bécares, V., Bečvář, F., Belloni, F., Berthoumieux, E., Billowes, J., Boccone, V., Brugger, M., Calviani, M., Calviño, F., Cano-Ott, D., Carrapiço, C., Cerutti, F., Chiaveri, E., Chin, M., Cortés, G., Cortés-Giraldo, M. A., Diakaki, M., Domingo-Pardo, C., Dressler, R., Duran, I., 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., Heinitz, S., Jenkins, D. G., Jericha, E., Kadi, Y., Käppeler, F., Karadimos, D., Kivel, N., Koehler, P., Kokkoris, M., Krtička, M., Kroll, J., Langer, C., Lederer, C., Leeb, H., Leong, L. S., Meo, S. Lo, Losito, R., Manousos, A., Marganiec, J., Martìnez, T., Massimi, C., Mastinu, P. F., Mastromarco, M., Meaze, M., Mendoza, E., Mengoni, A., Milazzo, P. M., Mingrone, F., Mirea, M., Mondalaers, W., Paradela, C., Pavlik, A., Perkowski, J., Plompen, A., Praena, J., Quesada, J. M., Rauscher, T., Reifarth, R., Riego, A., Roman, F., Rubbia, C., Sarmento, R., Saxena, A., Schillebeeckx, P., Schmidt, S., Schumann, D., Tagliente, G., Tain, J. L., Tarrío, D., Tassan-Got, 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., 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, P. Zugec, N. Colonna, D. Bosnar, S. Altstadt, J. Andrzejewski, L. Audouin, M. Barbagallo, V. Becare, F. Becvar, F. Belloni, E. Berthoumieux, J. Billowe, V. Boccone, M. Brugger, M. Calviani, F. Calvino, D. Cano-Ott, C. Carrapio, F. Cerutti, E. Chiaveri, M. Chin, G. Corte, M. A. Cortes-Giraldo, M. Diakaki, C. Domingo-Pardo, R. Dressler, I. Duran, N. Dzysiuk, C. Eleftheriadi, A. Ferrari, K. Fraval, S. Ganesan, A. R. Garcia, G. Giubrone, M. B. Gomez-Hornillo, I. F. Gonalve, E. Gonzalez-Romero, E. Griesmayer, C. Guerrero, F. Gunsing, P. Gurusamy, S. Heinitz, D. G. Jenkin, E. Jericha, Y. Kadi, F. Kaeppler, D. Karadimo, N. Kivel, P. Koehler, M. Kokkori, M. Krticka, J. Kroll, C. Langer, C. Lederer, H. Leeb, L. S. Leong, S. Lomeo, R. Losito, A. Manouso, J. Marganiec, T. Mart-Nez, C. Massimi, P. F. Mastinu, M. Mastromarco, M. Meaze, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, M. Mirea, W. Mondalaer, C. Paradela, A. Pavlik, J. Perkowski, A. Plompen, J. Praenam, J. M. Quesadam, T. Rauscher, R. Reifarth, A. Riego, F. Roman, C. Rubbia, R. Sarmento, A. Saxena, P. Schillebeeckx, S. Schmidt, D. Schumann, G. Tagliente, J. L. Tain, D. Tarrio, L. Tassan-Got, A. Tsingani, S. Valenta, G. Vannini, V. Variale, P. Vaz, A. Ventura, R. Versaci, M. J. Vermeulen, V. Vlachoudi, R. Vlastou, A. Wallner, T. Ware, M. Weigand, C. Wei, T. Wright, Ventura, A., Mengoni, A., Lo Meo, S., and Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear
Subjects: Neutron capture, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, GEANT4 simulations, Neutron time of flight, Neutron background, n_TOF, FOS: Physical sciences, Neutron, N-TOF, 7. Clean energy, 01 natural sciences, Partícules (Física nuclear), Nuclear physics, Cross section (physics), 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Instrumentation, physics.ins-det, GEANT4, Line (formation), Particles (Nuclear physics), Physics, Bonner sphere, Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, GEANT4 simulation, Física [Àrees temàtiques de la UPC], 010308 nuclear & particles physics, Detector, Física, Neutron sensitivity, Instrumentation and Detectors (physics.ins-det), Neutron radiation, NEUTRON TIME OF FLIGHT, Background, Deuterium, N_TOF, Simulation
Abstract: The neutron sensitivity of the C6D6 detector setup used at n_TOF facility for capture measurements has been studied by means of detailed GEANT4 simulations. A realistic software replica of the entire n_TOF experimental hall, including the neutron beam line, sample, detector supports and the walls of the experimental area has beeni mplemented in the simulations. The simulations have been analyzed in the same manner as experimental data, in particular by applying the Pulse Height Weighting Technique. The simulations have been validated against a measurement of the neutron background performed with anatC sample, showing an excellent agreement above 1 keV. At lower energies, an additional component in the measured natC yield has been discovered, which prevents the use of natC data for neutron background estimates at neutron energies below a few hundred eV. The origin and time structure of the neutron background have been derived from the simulations. Examples of the neutron background for two different samples are demonstrating the important role of accurate simulations of the neutron background in capture cross-section measurements., JRC.D.4-Standards for Nuclear Safety, Security and Safeguards
Published: 2014

119. Measurement and analysis of the ^241 Am(n,γ) cross section with liquid scintillator detectors using time-of-flight spectroscopy at the n_TOF facility at CERN

Author: Fraval, K., Gunsing, F., Altstadt, S., Andrzejewski, J., Audouin, L., Barbagallo, M., Bécares, V., Bečvář, F., Belloni, F., Berthoumieux, E., Billowes, J., Boccone, V., Bosnar, Damir, 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., Duran, I., Dressler, R., Dzysiuk, N., Eleftheriadis, C., Ferrari, A., Ganesan, S., García, A.R., Giubrone, G., Gómez-Hornillos, M. B., Gonçalves, I. F., González-Romero, E., Griesmayer, E., Guerrero, C., 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., Leal-Cidoncha, E., Lederer, C., Leeb, H., Leong, L.S., Losito, R., Mallick, A., Manousos, A., Marganiec, J., Martìnez, T., Massimi, C., Mastinu, P. F., Mastromarco, M., Meaze, M., Mendoza, E., Mengoni, A., Milazzo, P. M., Mingrone, F., Mirea, M., Mondalaers, W., Paradela, C., 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., Tarrío, D., Tassan-Got, 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., and Žugec, Petar
Subjects: PRIRODNE ZNANOSTI. Fizika, n_TOF, 241Am(n, g) neutron capture cross section, NATURAL SCIENCES. Physics
Abstract: The 241Am(n,γ ) cross section has been measured at the n_TOFfacility at CERN using deuterated benzene liquid scintillators, commonly known as C6D6 detectors, and time-of-flight spectrometry. The results in the resolved resonance range bring new constraints to evaluations below 150 eV, and the energy upper limit was extended from 150 to 320 eV with a total of 172 new resonances not present in current evaluations. The thermal capture cross section was found to be σth = 678 ± 68 b, which is in good agreement with evaluations and most previous measurements. The capture cross section in the unresolved resonance region was extracted in the remaining energy range up to 150 keV, and found to be larger than current evaluations and previous measurements., JRC.D.4-Standards for Nuclear Safety, Security and Safeguards
Published: 2014
Full Text: View/download PDF

120. Study of the 234U(n,f) fission fragment angular distribution at the 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., Duran, Ignacio, 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., Duran, Ignacio, Paradela, C., Calviño Tavares, Francisco, and Cortés Rossell, Guillem Pere
Abstract: The angular distribution of the f ssion fragments (FFAD) produced in neutron induced reactions of actinides have been measured with a fission detection setup based on parallel-plate avalanche counters (PPACs) at the Neutron Time-Of-Flight (n_TOF) facility at CERN. The main features of the setup and preliminary results are reported here for the 234U(n,f) reaction measurement showing a high concordance with previous data, while providing new results up to 100 MeV., Postprint (published version)
Published: 2014

121. Measurement of the 240,242Pu(n,f) cross section at the CERN n_TOF facility

Author: Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Tsinganis, A., Berthoumieux, Eric, Guerrero, Carlos, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Tsinganis, A., Berthoumieux, Eric, Guerrero, Carlos, Calviño Tavares, Francisco, and Cortés Rossell, Guillem Pere
Abstract: Knowledge of neutron cross sections of various plutonium isotopes and other minor actinides is crucial for the design of advanced nuclear systems. The 240, 242Pu(n,f) cross sections were measured at the CERN n_TOF facility, taking advantage of the wide energy range (from thermal to GeV) and the high instantaneous flux of the neutron beam. In this work, preliminary results for 242Pu are presented along with a theoretical cross section calculation performed with the EMPIRE code., Postprint (published version)
Published: 2014

122. Measurement of the neutron capture cross section of the fissile isotope 235U with the CERN n_TOF Total Absorption Calorimeter and a fission tagging based on micromegas detectors

Author: Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Mendoza, E., Cano-Ott, D, Balibrea-Correa, J., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Riego Pérez, Albert, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Mendoza, E., Cano-Ott, D, Balibrea-Correa, J., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, and Riego Pérez, Albert
Abstract: Actual and future nuclear technologies require more accurate nuclear data on the (n, gamma) cross sections and -ratios of fissile isotopes. Their measurement presents several difficulties, mainly related to the strong fission gamma-ray background competing with the weaker gamma-ray cascades used as the experimental signature of the (n,gamma) process. A specific setup has been used at the CERN n_TOF facility in 2012 for the measurement of the (n,gamma) cross section and alpha-ratios of fissile isotopes and used for the case of the 235U isotope. The setup consists in a set of micromegas fission detectors surrounding 235U samples and placed inside the segmented BaF2 Total Absorption Calorimeter., Postprint (published version)
Published: 2014

123. Radiative capture on 242Pu for MOX fuel reactors

Author: Guerrero, Carlos, Balibrea-Correa, J., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, 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, Física [Àrees temàtiques de la UPC], Cross section, CERN, Nuclear physics, n_TOF, Física nuclear, Nuclear reaction
Abstract: Proposal: Radiative capture on 242Pu for MOX fuel reactors The use of MOX fuel (mixed-oxide fuel made of UO2 and PuO2) in nuclear reactors allows substituting a large fraction of the enriched Uranium by Plutonium reprocessed from spent fuel. Indeed around 66% of the plutonium from spent fuel is made of 239Pu and 241Pu, which are fissile in thermal reactors. A typical reactor of this type uses a fuel with 7% reprocessed Pu and 93% depleted U, thus profiting from both the spent fuel and the remaining 238U following the 235U enrichment. With the use of such new fuel compositions rich in Pu the better knowledge of the capture and fission cross sections of the Pu isotopes becomes very important. This is clearly stated in the recent OECD NEA’s “High Priority Request List” and in the WPEC-26 “Uncertainty and target accuracy assessment for innovative systems using recent covariance data evaluations” report. In particular, a new series of cross section evaluations have been recently carried out jointly by the European (JEFF) and United States (ENDF) nuclear data agencies. As the new evaluations on 240Pu and 241Am have been already completed, 242Pu is the next to be reevaluated, and the scarceness of capture data (only two TOF measurements from 1973 and 1976 are available and disagree with each other) calls for a new time-of flight capture cross section measurement. This will be the first measurement in 40 years and, with the use of more advanced techniques, shall provide a more reliable and accurate result. We propose to measure the capture cross section of 242Pu in the region from thermal up to at least 60 keV, aiming for a high energy limit of 500 keV. The experiment would make use of an array of 4 low neutron sensitivity C6D6 detectors and be carried out at the n_TOF EAR-1 (185 m flight path) measuring station. Compared to the current uncertainty of 35%, this measurement aims at an improved accuracy between 7% and 12% depending on the energy region.
Published: 2013

124. Study of a MICROMEGAS detector designed for neutron flux measurements and fission fragment detection using the FLUKA code

Author: Skordis, Eleftherios I., Κόκκορης, Μιχαήλ, Βλαστού-Ζάννη, Ρόζα, Αλεξόπουλος, Θεόδωρος, and Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Εφαρμοσμένων Μαθηματικών & Φυσικών Επιστημών
Subjects: Προσομοιώσεις, Flux, Βόριο, Cross section, Ανιχνευτές αερίου, Measurements, Fission fragments, 237Np, Neutron, Θραύσματα σχάσης, FLUKA, Νετρονική ροή, Νεπτούνιο, CERN, n_TOF, Μελέτες, Ουράνιο, Micromegas
Abstract: 68 σ., Εθνικό Μετσόβιο Πολυτεχνείο--Μεταπτυχιακή Εργασία. Διεπιστημονικό-Διατμηματικό Πρόγραμμα Μεταπτυχιακών Σπουδών (Δ.Π.Μ.Σ.) “Φυσική και Τεχνολογικές Εφαρμογές”, Οι ανιχνευτές αερίου, βασισμένοι στην τεχνολογία Micromegas[1], χρησιμοποιούνται ευρέως σε διάφορα πειράματα ατομικής, πυρηνικής και σωματιδιακής φυσικής. Επιπλέον, έχουν ιδιαίτερα χαμηλό κόστος κατασκευής, παρουσιάζουν ανθεκτικότητα σε περιβάλλον υψηλής ακτινοβολίας, ενώ συνδυάζουν ικανότητες σκανδαλισμού και προσδιορισμού τροχιάς. Με βάση αυτές τις ιδιότητες κατασκευάστηκε στο CERN μια συστοιχία ανιχνευτών Micromegas με την τεχνολογία Microbulk [2] κλεισμένων μέσα σε ένα κυλινδρικό αλουμινένιο θάλαμο με σκοπό την ταυτόχρονη έμμεση μέτρηση νετρονίων διαφόρων ενεργειών καθώς και θραυσμάτων σχάσης. Ο συγκεκριμένος ανιχνευτής χρησιμοποιείται σε δύο διαφορετικά πειράματα. Το πρώτο πείραμα είναι το n_TOF [3,4] που πραγματοποιείται στο CERN, με σκοπό την προσδιορισμό της ροής των νετρονίων της «λευκής» (όλων των ενεργειών) δέσμης του πειράματος που παράγεται από τη διαδικασία κατακερματισμού (spallation) στόχου μολύβδου που βομβαρδίζεται από δέσμη πρωτονίων ενέργειας 1 GeV. Το δεύτερο πείραμα πραγματοποιήθηκε με την συνεργασία της ομάδας πυρηνικής φυσικής του τομέα φυσικής του Εθνικού Μετσόβιου Πολυτεχνείου και του Ε.Κ.Ε.Φ.Ε. ΔΗΜΟΚΡΙΤΟΣ [5,6] και είχε ως σκοπό τον υπολογισμό της ενεργού διατομής της σχάσης του 237Np με νετρόνια 5-8 MeV. Βασικός σκοπός της παρούσας διπλωματικής ήταν η πραγματοποίηση προχωρημένων προσομοιώσεων με χρήση του κώδικα προσομοίωσης Monte Carlo FLUKA [7] με σκοπό την θεωρητική πρόβλεψη της απόκρισης του ανιχνευτή στην ανίχνευση των προϊόντων της αντίδρασης 10Β(n,α)7Li, καθώς και των θραυσμάτων σχάσης του 237Np. Τέλος για τις ανάγκες της προσομοίωσης αναπτύχτηκε και χρησιμοποιήθηκε μια συμπληρωματική ρουτίνα στην γλώσσα προγραμματισμού gFortran με σκοπό την σωστή παραγωγή των αρχικών σωματιδίων προς προσομοίωση., Detectors based on the Micromegas principle have already been used in several atomic, nuclear and particle physics experiments. Moreover, they have low construction cost and are resistant to high levels of radiation. Consequently, very recently a new transparent neutron detector based on the Micromegas Micro-Bulk [2] technology has been developed. The challenge was to obtain a neutron transparent detector as a monitor of a neutron beam that was big enough to avoid significant neutron background generated by neutrons scattering from the chamber structure. Thus a large detector was developed at CERN within the context of the n_TOF collaboration [3,4], that was also capable of performing neutron induced fission and (n,α) cross section measurements. In this specific study, Monte Carlo simulations were carried out using the FLUKA [7] code, as part of computational support to two different experiments. The first part of the simulations was a study carried out for the n_TOF experiment which included the simulation of energy deposited by the products of the 10Β(n,α)7Li reaction inside the active gas area of the Micromegas detector. In order to better integrate the above reaction to the FLUKA code, an external routine was developed in the FORTRAN programming language in order to create a separate input file which contained information about the particles that had to be simulated. More to the point the routine was responsible for creating a file that included the energy and the position and direction coordinates of the α and 7Li particles. The routine took into consideration the kinematics of the reaction as well as the cross section which was taken from the ENDF/B-VII.1 [8] library. Furthermore, a modified version of the FLUKA source routine was used in order to feed the information of the particles to the FLUKA code and simultaneously to simulate the energy deposition of both products inside the active gas area. The final result was an event by event histogram of energy deposition which modelled the expected spectra of the Micromegas detector. After the study was accomplished, the final results were then compared to the actual experimental data and a fair agreement between the simulation and the experiment was found. The second part of the simulations was related to the experimental measurement of the 236Np(n,f) cross section that was conducted by the Nuclear Physics group of the Physics Department of the NTUA and took place at the Tandem accelerator facility of NCSR “Demokritos” in Athens [5,6]. The purpose of the study was to once again provide the experiment with information about the expected experimental spectra as well as to aid in the specification of the detector’s limits in the lower energy part of the spectra, where the noise from the electronics cannot be decoupled from the experimental data. Moreover, this was a two scale study, since the 236Np de-excites to 233Pa with the emittance of α particles of 4.8 MeV energy. Consequently there was a need of studying both the energy deposition, in the active gas volume of the detector, of α-particles as well as the fission fragments of the above mentioned reaction. The same strategy as for the previous simulations was adopted and an external routine was implemented as input to the FLUKA code. The α-particles were isotropically produced and simulated with precise energies. The results of the α-particles study were afterwards compared to the experimental spectra with a satisfactory agreement and the values of the simulated α efficiencies agreed with the experimental ones within 2-3%. For the second scale of this study the external routine integrated experimental data of the reaction based on the published studies [9] and [10] , in order to create fission fragments in the following way. A heavy fission fragment was selected from a Gaussian distribution with mean value μ=140 and standard deviation σ=6.5. Then 1-3 neutrons were assumed to be emitted in order to calculate the mass number of the light fragment and an average total kinetic energy of 174 MeV was distributed to their mass. The atomic number Z of the fission fragments was sampled from ±5 around the mean value given in [9]. The fission fragments produced were isotropically distributed in the volume of the target and their energy deposition was scored in the active gas area of the detector. The result was, once again, an event by event energy deposition histogram that was used as reference for the calibration of the detector. In a nutshell, the results of the Monte Carlo simulations using the FLUKA code that were conducted in the frame of this Master thesis, were more than satisfactory when compared to the experimental spectra. Moreover the study that was conducted clearly contributed in the success of the experiments and in the final publication of the experimental results. Last but not least, the outcome of this study showed that simulations seem to play a significant role in the experimental area and significantly aid in better understanding the physics that is involved behind any experiment., Ελευθέριος Ι. Σκορδής
Published: 2013
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125. 238U(n, gamma) reaction cross section measurement with C6D6 detectors at the n_TOF CERN facility

Author: G. Cortes, D. Tarrío, C. Lederer, F. Bečvář, F. Käppeler, E. Mendoza, I. Duran, F. Cerutti, Peter Schillebeeckx, F. Mingrone, C. Lampoudis, Y. Kadi, J. Andrzejewski, T. Ware, V. Bécares, E. Griesmayer, A. Riego, A. Mallick, G. Vannini, A. K. Saxena, G. Tagliente, Javier Praena, P. M. Milazzo, Arnaud Ferrari, V. Variale, Jeri Kroll, M. P. W. Chin, M. S. Robles, M. J. Vermeulen, J. Billowes, P. E. Koehler, E. Jericha, I. F. Gonçalves, P. Vaz, Sebastian Schmidt, S. Altstadt, D. Cano-Ott, Dorothea Schumann, C. Weiß, S. Valenta, M. Diakaki, R. Sarmento, Marco Calviani, Fabio Belloni, R. Vlastou, A. Manousos, E. Berthoumieux, J. Marganiec, A. R. García, D. Bosnar, M. Brugger, G. Giubrone, A. J. M. Plompen, Carlos Guerrero, E. Leal-Cidoncha, C. Eleftheriadis, Thomas Rauscher, D. Karadimos, T. J. Wright, E. González-Romero, Christoph Langer, Petar Žugec, A. Pavlik, C. Domingo-Pardo, M. Sabaté-Gilarte, C. Paradela, L. Audouin, W. Mondalaers, Pierfrancesco Mastinu, D. G. Jenkins, Roberto Losito, M. A. Cortés-Giraldo, Srinivasan Ganesan, Rugard Dressler, A. Tsinganis, Nicola Colonna, L.S. Leong, Vasilis Vlachoudis, Mario Barbagallo, C. Rubbia, J. L. Tain, Niko Kivel, K. Fraval, Alberto Mengoni, E. Chiaveri, M. Mirea, H. Leeb, J. Perkowski, F. Gunsing, Cristian Massimi, M. Krtička, F. Calviño, Mario Weigand, A. Ventura, T. Martinez, Rene Reifarth, J. M. Quesada, L. Tassan-Got, A. Hernández-Prieto, M. Mastromarco, C. Carrapiço, Anton Wallner, Ventura, A., Mengoni, A., Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, INPC 2013 – International Nuclear Physics Conference, Lunardi, S., Mingrone, F., Massimi, C., Vannini, G., Altstadt, S., Andrzejewski, J., Audouin, L., Barbagallo, M., Bécares, V., Bečvář, F., Belloni, F., Berthoumieux, E., Billowes, J., 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., Duran, I., Dressler, R., Eleftheriadis, C., Ferrari, A., Fraval, K., Ganesan, S., García, A.R., Giubrone, G., Gonçalves, I.F., González-Romero, E., Griesmayer, E., Guerrero, C., Gunsing, F., Hernández-Prieto, A., Jenkins, D.G., Jericha, E., Kadi, Y., Käppeler, F., Karadimos, D., Kivel, N., Koehler, P., Krtička, M., Kroll, J., Lampoudis, C., Langer, C., Leal-Cidoncha, E., Lederer, C., Leeb, H., Leong, L.S., Losito, R., Mallick, A., Manousos, A., Marganiec, J., Martínez, T., Mastinu, P.F., Mastromarco, M., Mendoza, E., Milazzo, P.M., Mirea, M., Mondalaers, W., Paradela, C., Pavlik, A., Perkowski, J., Plompen, A., Praena, J., Quesada, J.M., Rauscher, T., Reifarth, R., Riego, A., Robles, M.S., Rubbia, C., Sabaté-Gilarte, M., Sarmento, R., Saxena, A., Schillebeeckx, P., Schmidt, S., Schumann, D., Tagliente, G., Tain, J.L., Tarrío, D., Tassan-Got, L., Tsinganis, A., Valenta, S., Variale, V., Vaz, P., Vermeulen, M.J., Vlachoudis, V., Vlastou, R., Wallner, A., Ware, T., Weigand, M., Weiß, C., Wright, T., and Žugec, P.
Subjects: Physics, Nuclear reaction, Energies::Energia nuclear [Àrees temàtiques de la UPC], Scintillation, Background subtraction, 010308 nuclear & particles physics, QC1-999, 238U, neutron capture, n_TOF, Nuclear energy, 01 natural sciences, Engineering physics, Particle detector, Nuclear physics, Physics and Astronomy (all), Cross section (physics), 0103 physical sciences, Scintillation counter, Measuring instrument, Energia nuclear, ddc:530, 010306 general physics, Data reduction
Abstract: The radiative capture cross section of 238U is very important for the developing of new reactor technologies and the safety of existing ones. Here the preliminary results of the 238U(n,γ) cross section measurement performed at n-TOF with C6D6 scintillation detectors are presented, paying particular attention to data reduction and background subtraction. © Owned by the authors, published by EDP Sciences, 2014.
Published: 2013

126. Neutron beam imaging with Micromegas detectors in combination with neutron time-of-flight at the n_TOF facility at CERN

Author: Belloni, F., Bosnar, Damir, and Žugec, Petar
Subjects: Physics::Instrumentation and Detectors, neutron beam imaging, Micromegas, n_TOF, Physics::Accelerator Physics, Nuclear Experiment
Abstract: A bulk micromegas detector with the anode segmented in 2 orthogonal directions and equipped with a neutron/charged particle converter is employed at the neutron time-of-flight (n_TOF) facility at CERN to determine the incident neutron beam profile and beam interception factor as a function of the neutron energy determined by the time of flight. Discrepancies between experimental results and simulations in the values of the beam interception factor range up to 12% and are to be ascribed to a defect in the mesh of the bulk. Nevertheless the detector proved to be really useful for checking the alignment of the neutron beam optics of the facility. Measurements with a new pixelized bulk detector for the determination of the beam interception factor are forseen before the end of 2012.
Published: 2013

127. Neutron research at the N-TOF facility (CERN): Results and perspectives

Author: M. Mirea, Rene Reifarth, F. Calviño, H. Leeb, Stefan Schmidt, G. Vannini, J. Perkowski, J. M. Quesada, D. G. Jenkins, L. Tassan-Got, F. Becvar, A. Tsinganis, Christoph Langer, R. Vlastou, A. Ferrari, Mario Weigand, E. Berthoumieux, M. Mastromarco, L.S. Leong, J. Andrzejewski, M. Calviani, F. Gunsing, Carlos Guerrero, Vasilis Vlachoudis, Cristian Massimi, A. J. M. Plompen, G. Tagliente, E. Chiaveri, Srinivasan Ganesan, M. B. Gomez Hornillos, P. F. Mastinu, Anton Wallner, M. P. W. Chin, F. Mingrone, M. A. Cortés-Giraldo, P. Vaz, C. Lederer, J. L. Tain, M. Meaze, G. Cortes, M. J. Vermeulen, Mario Barbagallo, E. Jericha, D. Tarrío, S. Altstadt, Alberto Ventura, I. F. Gonçalves, F. Roman, C. Carrapiço, D. Bosnar, M. Krtička, W. Mondalaers, V. Boccone, Jeri Kroll, T. Martinez, E. Mendoza, T. J. Wright, Fabio Belloni, G. Giubrone, N. Colonna, Roberto Losito, R. Sarmento, A. Riego, Peter Schillebeeckx, N. Dzysiuk, F. Käppeler, J. Billowes, C. Rubbia, A. Pavlik, C. Domingo-Pardo, P. M. Milazzo, V. Bécares, C. Eleftheriadis, M. Kokkoris, K. Fraval, Y. Kadi, Thomas Rauscher, Javier Praena, P. Gurusamy, D. Karadimos, Alberto Mengoni, E. González-Romero, A. R. García, S. Valenta, M. Brugger, P. Zugec, D. Cano-Ott, M. Diakaki, A. Manousos, F. Cerutti, J. Marganiec, I. Duran, V. Variale, Roberto Versaci, P. E. Koehler, T. Ware, E. Griesmayer, C. Weiss, C. Paradela, L. Audouin, Ventura, A., Mengoni, A., Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Floyd D. McDaniel , Barney L. Doyle , Gary A. Glass and Yongqiang Wang, N. Colonna, S. Altstadt, J. Andrzejewski, L. Audouin, M. Barbagallo, V. Bécare, F. Bečvář, F. Belloni, E. Berthoumieux, J. Billowe, V. Boccone, D. Bosnar, M. Brugger, M. Calviani, F. Calviño, D. Cano-Ott, C. Carrapiço, F. Cerutti, E. Chiaveri, M. Chin, G. Corté, M. A. Cortés-Giraldo, M. Diakaki, C. Domingo-Pardo, I. Duran, N. Dzysiuk, C. Eleftheriadi, A. Ferrari, K. Fraval, S. Ganesan, A. R. García, G. Giubrone, M. B. Gómez- Hornillo, I. F. Gonçalve, E. González-Romero, E. Griesmayer, C. Guerrero, F. Gunsing, P. Gurusamy, D. G. Jenkin, E. Jericha, Y. Kadi, F. Käppeler, D. Karadimo, P. Koehler, M. Kokkori, M. Krtička, J. Kroll, C. Langer, C. Lederer, H. Leeb, L. S. Leong, R. Losito, A. Manouso, 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. Mondalaer, C. Paradela, A. Pavlik, J. Perkowski, A. Plompen, J. Praena, J. M. Quesada, T. Rauscher, R. Reifarth, A. Riego, F. Roman, C. Rubbia, R. Sarmento, P. Schillebeeckx, S. Schmidt, G. Tagliente, J. L. Tain, D. Tarrío, L. Tassan-Got, A. Tsingani, S. Valenta, G. Vannini, V. Variale, P. Vaz, A. Ventura, R. Versaci, M. J. Vermeulen, V. Vlachoudi, R. Vlastou, A. Wallner, T. Ware, M. Weigand, C. Wei, T. J. Wright, and P. Žugec
Subjects: Nuclear reaction, Fission, Nuclear physics, Neutron time-of-flight facility, NEUTRON INDUCED REACTIONS, Stellar nucleosynthesis, Spallation neutron source, Advanced nuclear reactors, Neutron-induced reactions, CERN, Nuclear astrophysics, Neutron, n_TOF, Advanced nuclear reactor, Nuclear Experiment, Physics, Neutrons, Energies::Energia nuclear [Àrees temàtiques de la UPC], Large Hadron Collider, Física [Àrees temàtiques de la UPC], fission, neutron radiative capture, radioactive decay periods, Stellar nucleosynthesi, Neutron-induced reaction, TIME-OF-FLIGHT, Neutron capture, N_TOF, Física nuclear, Nucleosynthesis, Radioactive decay, Spallation Neutron Source, Nucleosíntesi
Abstract: In the first ten years of operation, the neutron time-of-flight facility n-TOF at CERN has produced a large body of new and accurate data on neutron capture and fission cross sections, relevant to Nuclear Astrophysics and advanced nuclear technologies. In the next phase, with the construction of a second experimental area with a shorted flight path, the focus of the Collaboration will partially shift from high-resolution measurements of stable or long-lived isotopes, to high-flux measurements of isotopes of relatively short half-life, very low-cross sections, or available in very small quantities. The main results obtained so far at n-TOF and the future perspectives are here presented. © 2013 AIP Publishing LLC. In the first ten years of operation, the neutron time-of-flight facility n-TOF at CERN has produced a large body of new and accurate data on neutron capture and fission cross sections, relevant to Nuclear Astrophysics and advanced nuclear technologies. In the next phase, with the construction of a second experimental area with a shorted flight path, the focus of the Collaboration will partially shift from high-resolution measurements of stable or long-lived isotopes, to high-flux measurements of isotopes of relatively short half-life, very low-cross sections, or available in very small quantities. The main results obtained so far at n-TOF and the future perspectives are here presented. © 2013 AIP Publishing LLC.
Published: 2013

128. High-accuracy determination of the neutron flux at n TOF

Author: G. Vannini, A. R. García, M. Brugger, E. Leal-Cidoncha, C. Eleftheriadis, Thomas Rauscher, M. B. Gómez-Hornillos, Christoph Langer, D. Karadimos, M. P. W. Chin, E. González-Romero, Rene Reifarth, F. Cerutti, Petar Žugec, F. Roman, Stefan Schmidt, W. Mondalaers, S. Andriamonje, Kathrin Göbel, J. M. Quesada, R. Versaci, L. Tassan-Got, G. Cortes, E. Jericha, A. Manousos, D. Tarrío, Srinivasan Ganesan, M. Kokkoris, P. F. Mastinu, C. Paradela, Patrick Steinegger, S. Valenta, Marco Calviani, G. Giubrone, M. Meaze, E. Chiaveri, D. Cano-Ott, Dorothea Schumann, Carlos Guerrero, J. Marganiec, T. Martinez, E. Mendoza, E. Berthoumieux, Roberto Losito, M. Mastromarco, M. Mirea, D. G. Jenkins, Javier Praena, A. Hernández-Prieto, L. Audouin, V. Bécares, C. Lampoudis, A. Pavlik, C. Domingo-Pardo, Mario Barbagallo, C. Carrapiço, Anton Wallner, G. Tagliente, A. J. M. Plompen, A. K. Saxena, M. Sabaté-Gilarte, Rugard Dressler, T. Ware, F. Mingrone, J. Andrzejewski, Alberto Mengoni, T. Papaevangelou, J. Billowes, Carlo Rubbia, M. A. Cortés-Giraldo, A. Tsinganis, V. Vlachoudis, J. L. Tain, V. Boccone, R. Vlastou, Nicola Colonna, L.S. Leong, V. Variale, Yacine Kadi, T. J. Wright, Damir Bosnar, P. Vaz, H. Leeb, P. M. Milazzo, J. Perkowski, Alberto Ventura, E. Griesmayer, Alfredo Ferrari, F. Gunsing, M. Krtička, F. Calviño, Jeri Kroll, R. Sarmento, Cristian Massimi, S. Altstadt, M. Diakaki, F. Bečvář, Peter Schillebeeckx, N. Dzysiuk, M. J. Vermeulen, Mario Weigand, P. E. Koehler, I. Duran, C. Weiß, F. Käppeler, K. Fraval, N. Kivel, P. Gurusamy, C. Lederer, A. Riego, I. F. Gonçalves, Fabio Belloni, M. Barbagallo, C. Guerrero, A. Tsingani, D. Tarrio, S. Altstadt, S. Andriamonje, J. Andrzejewski, L. Audouin, V. Becare, F. Becvar, F. Belloni, E. Berthoumieux, J. Billowe, V. Boccone, D. Bosnar, M. Brugger, M. Calviani, F. Calvino, D. Cano-Ott, C. Carrapico, F. Cerutti, E. Chiaveri, M. Chin, N. Colonna, G. Corte, M. A. Cortes-Giraldo, M. Diakaki, C. Domingo-Pardo, I. Duran, R. Dressler, N. Dzysiuk, C. Eleftheriadi, A. Ferrari, K. Fraval, S. Ganesan, A. R. Garcia, G. Giubrone, K. Gobel, M. B. Gomez-Hornillo, I. F. Goncalve, E. Gonzalez-Romero, E. Griesmayer, F. Gunsing, P. Gurusamy, A. Hernandez-Prieto, D. G. Jenkin, E. Jericha, Y. Kadi, F. Kappeler, D. Karadimo, N. Kivel, P. Koehler, M. Kokkori, M. Krticka, J. Kroll, C. Lampoudi, C. Langer, E. Leal-Cidoncha, C. Lederer, H. Leeb, L. S. Leong, R. Losito, A. Manouso, J. Marganiec, T. Martinez, C. Massimi, P. F. Mastinu, M. Mastromarco, M. Meaze, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, M. Mirea, W. Mondalaer, T. Papaevangelou, C. Paradela, A. Pavlik, J. Perkowski, A. Plompen, J. Praena, J. M. Quesada, T. Rauscher, R. Reifarth, A. Riego, F. Roman, C. Rubbia, M. Sabate-Gilarte, R. Sarmento, A. Saxena, P. Schillebeeckx, S. Schmidt, D. Schumann, P. Steinegger, G. Tagliente, J. L. Tain, L. Tassan-Got, S. Valenta, G. Vannini, V. Variale, P. Vaz, A. Ventura, R. Versaci, M. J. Vermeulen, V. Vlachoudi, R. Vlastou, A. Wallner, T. Ware, M. Weigand, C. Wei, T. Wright, P. Zugec, Mengoni, A., 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, 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 Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, TOF, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear and High Energy Physics, Fission, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Flux, BEAM, neutron flux, n_TOF, Neutron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, Cross section (physics), Neutron flux, 0103 physical sciences, CERN, Nuclear fusion, High pressure physics, Spallation, FACILITY, Experimental physics, 010306 general physics, Nuclear Experiment, Physics, Neutrons, Energies::Energia nuclear [Àrees temàtiques de la UPC], Física [Àrees temàtiques de la UPC], 010308 nuclear & particles physics, SCIENCE, Neutron radiation, Ntof, 13. Climate action, STANDARDS
Abstract: The neutron flux of the n TOF facility at CERN was measured, after installation of the new spallation target, with four different systems based on three neutron-converting reactions, which represent accepted cross sections standards in different energy regions. A careful comparison and combination of the different measurements allowed us to reach an unprecedented accuracy on the energy dependence of the neutron flux in the very wide range (thermal to 1 GeV) that characterizes the n TOF neutron beam. This is a pre-requisite for the high accuracy of cross section measurements at n TOF. An unexpected anomaly in the neutron-induced fission cross section of 235U is observed in the energy region between 10 and 30 keV, hinting at a possible overestimation of this important cross section, well above currently assigned uncertainties. © Società Italiana di Fisica / Springer-Verlag 2013.
Published: 2013
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129. A new CVD diamond mosaic-detector for (n, α) cross-section measurements at the n_TOF experiment at CERN

Author: F. Bečvář, T. J. Wright, F. Cerutti, Mario Weigand, E. Gonzalez-Romero, Rene Reifarth, J. L. Tain, C. Lampoudis, C. Lederer, N. Kivel, Stefan Schmidt, M. Meaze, J. M. Quesada, F. Gunsing, J. Billowes, Jeri Kroll, P. Vaz, Srinivasan Ganesan, P. Gurusamy, K. Fraval, Cristian Massimi, Alberto Ventura, M. B. Gómez-Hornillos, E. Mendoza, C. Paradela, Javier Praena, R. Sarmento, Mario Barbagallo, E. Berthoumieux, M. S. Robles, A. Riego, M. Krtička, F. Calviño, M. A. Cortés-Giraldo, M. Mirea, G. Tagliente, Peter Schillebeeckx, N. Dzysiuk, Carlos Guerrero, A. Pavlik, T. Martinez, L. Audouin, Petar Žugec, Alfredo Ferrari, C. Domingo-Pardo, Roberto Losito, V. Variale, I. Duran, H. Leeb, M. Sabaté-Gilarte, M. Mastromarco, F. Käppeler, M. Diakaki, J. Perkowski, A. K. Saxena, P. M. Milazzo, J. Marganiec, A. Mallick, G. Vannini, Gerald Badurek, V. Boccone, S. Altstadt, A. Hernández-Prieto, A. J. M. Plompen, P. F. Mastinu, A. Manousos, C. Eleftheriadis, E. Jericha, G. Giubrone, E. Chiaveri, D. Cano-Ott, Alberto Mengoni, V. Bécares, Dorothea Schumann, Yacine Kadi, Rugard Dressler, C. Weiß, R. Versaci, P. E. Koehler, F. Mingrone, J. Andrzejewski, A. Tsinganis, G. Cortes, M. Kokkoris, D. Tarrío, Carlo Rubbia, Nicola Colonna, L.S. Leong, C. Langer, V. Vlachoudis, E. Griesmayer, T. Ware, C. Carrapiço, Anton Wallner, D. G. Jenkins, Laurent Tassan-Got, W. Mondalaers, Fabio Belloni, M. P. W. Chin, F. Roman, E. Leal-Cidoncha, I. Goncalves, Thomas Rauscher, M. J. Vermeulen, D. Karadimos, S. Valenta, A. R. García, M. Brugger, Marco Calviani, R. Vlastou, Damir Bosnar, 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 Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, TOF, 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, 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), Ventura, A., Mengoni, A., C. Wei, E. Griesmayer, C. Guerrero, S. Altstadt, J. Andrzejewski, L. Audouin, G. Badurek, M. Barbagallo, V. Becare, F. Becvar, F. Belloni, E. Berthoumieux, J. Billowe, V. Boccone, D. Bosnar, M. Brugger, M. Calyiani, F. Calvino, D. Cano-Ott, C. Carrapico, F. Cerutti, E. Chiaveri, M. Chin, N. Colonna, G. Corte, M. A. Cortes-Giraldo, M. Diakaki, C. Domingo-Pardo, I. Duran, R. Dressler, N. Dzysiuk, C. Eleftheriadi, A. Ferrari, K. Fraval, S. Ganesan, A. R. Garcia, G. Giubrone, M. B. Gomez-Hornillo, I. F. Goncalve, E. Gonzalez-Romero, F. Gunsing, P. Gurusamy, A. Hernandez-Prieto, D. G. Jenkin, E. Jericha, Y. Kadi, F. Kappeler, D. Karadimo, N. Kivel, P. Koehler, M. Kokkori, M. Krticka, J. Kroll, C. Lampoudi, C. Langer, E. Leal-Cidoncha, C. Lederer, H. Leeb, L. S. Leong, R. Losito, A. Mallick, A. Manouso, J. Marganiec, T. Martinez, C. Massimi, P. F. Mastinu, M. Mastromarco, M. Meaze, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, M. Mirea, W. Mondalaer, C. Paradela, A. Pavlik, J. Perkowski, A. Plompen, J. Praena, J. M. Quesada, T. Rauscher, R. Reifarth, A. Riego, M. S. Roble, F. Roman, C. Rubbia, M. Sabate-Gilarte, R. Sarmento, A. Saxena, P. Schillebeeckx, S. Schmidt, D. Schumann, G. Tagliente, J. L. Tain, D. Tarrio, L. Tassan-Got, A. Tsingani, S. Valenta, G. Vannini, V. Variale, P. Vaz, A. Ventura, R. Versaci, M. J. Vermeulen, V. Vlachoudi, R. Vlastou, A. Wallner, T. Ware, M. Weigand, T. Wright, and P. Zugec
Subjects: Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Energies [Àrees temàtiques de la UPC], Analytical chemistry, Chemical vapor deposition, 7. Clean energy, 01 natural sciences, CVD diamond detectors, Chemical reactions, n_TOF, Detectors and Experimental Techniques, Energy resolution, Nuclear Experiment, Instrumentation, Physics, sCVD diamond detectors, (n, α) Cross-section measurements, Large Hadron Collider, ntof, Detector, Resolution (electron density), Austria, Sponsored this work, Vienna, Nuclear Detector, Enginyeria química::Química física [Àrees temàtiques de la UPC], Nuclear and High Energy Physics, Cross-section measurements, Nanotechnology, engineering.material, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Reaccions químiques, Cross section (physics), 0103 physical sciences, (n,α) Cross-section measurement, Neutron, 010306 general physics, Diode, Energies::Energia nuclear [Àrees temàtiques de la UPC], CIVIDEC Instrumentation GmbH, 010308 nuclear & particles physics, (n,α) Cross-section measurements, n-TOF, neutrons, Diamond, (n, α) cross-section measurements, engineering, High Energy Physics::Experiment, diamond detector
Abstract: At the n\_TOF experiment at CERN a dedicated single-crystal chemical vapor deposition (sCVD) Diamond Mosaic-Detector has been developed for (n,$\alpha$) cross-section measurements. The detector, characterized by an excellent time and energy resolution, consists of an array of 9 sCVD diamond diodes. The detector has been characterized and a cross-section measurement has been performed for the $^{59}$Ni(n,$\alpha$)$^{56}$Fe reaction in 2012. The characteristics of the detector, its performance and the promising preliminary results of the experiment are presented., Comment: Conference proceedings of the Vienna Conference on Instrumentation 2013
Published: 2013
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130. Angular distribution in the neutron-induced fission of actinides

Author: A. Manousos, Willy Mondelaers, A. Mengon, R. Sarmento, C. Eleftheriadis, M. B. Gómez-Hornillos, D. Schumann, G. Cortes, Thomas Rauscher, D. Tarrío, M. Mirea, Carlos Guerrero, R. Dressler, M. Mastromarco, F. Roman, S. Valenta, González-Romero, P. E. Koehler, R. Reifhart, G. Korschinek, C. Carrapiço, J. Billowes, J. Marganiec, V. Vlastou, T. Ware, A. R. García, Anton Wallner, C. Paradela, M. Brugger, V. Variale, G. Giubrone, L. Audouin, G. Tagliente, F. Calviño, P. Gurusamy, G. Vannini, E. Jericha, E. Griesmayer, C. Rubbia, E. Mendoza, Jan Perkowski, M. Weigand, M. P. W. Chin, Nicola Colonna, F. Bečvář, L.S. Leong, V. Vlachoudis, K. Fraval, M. Diakaki, R. Versaci, C. Weiß, I. Duran, N. Dzysiuk, P. F. Mastinu, E. Berthoumieux, E. Kadi, Marco Pignatari, C. Le Naour, A. Riego, P. Schillebeeckx, V. Bécares, Arnaud Ferrari, F. Gunsing, M. Meaze, T. Wright, I. F. Gonçalves, Cristian Massimi, J. L. Tain, M. Krtička, Marco Calviani, C. Lederer, T. Martinez, Fabio Belloni, S. Altstadt, A. Plompen, P. M. Milazzo, N. Kivel, A. Pavlik, C. Langer, C. Domingo-Pardo, A. Tsinganis, F. Käppeler, D. Karadimos, D. Bosnar, M. Kokkoris, T. Mingrone, E. Chiaveri, M. J. Vermeulen, Srinivasan Ganesan, D. G. Jenkins, D. Cano-Ott, Hannes Leeb, Mario Barbagallo, M. A. Cortés-Giraldo, J. Andrzejewsky, R. Losito, J. Kroll, P. Vaz, Javier Praena, Alberto Ventura, Zǔgec, Stefan Schmidt, Vittorio Boccone, J. M. Quesada, L. Tassan-Got, F. Cerutti, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Mengoni, A., Chatillon, A., Leong, L.S., Tassan-Got, L., Tarrio, D., Audouin, L., Paradela, C., Duran, I., Le Naour, C., Altstadt, S., Andrzejewsky, J., Barbagallo, M., Bécares, V., Bečvář, F., Belloni, F., Berthoumieux, E., Billowes, J., Boccone, V., Bosnar, D., Brugger, M., Calvino, F., Calviani, M., 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, Griesmayer, E., Guerrero, C., Gunsing, F., Gurusamy, P., Jenkins, D.G., Jericha, E., Kadi, E., Käppeler, F., Karadimos, D., Kivel, N., Koehler, P., Kokkoris, M., Korschinek, G., Kroll, J., Krtička, M., Langer, C., Lederer, C., Leeb, H., Losito, R., Manousos, A., Marganiec, J., Massimi, C., Martínez, T., Mastinu, P.F., Mastromarco, M., Meaze, M., Mengon, A., Mendoza, E., Milazzo, P.M., Mingrone, T., Mirea, M., Mondelaers, W., Pavlik, A., Perkowski, J., Pignatari, M., Plompen, A., Praena, J., Quesada, J.M., Rauscher, T., Reifhart, R., Riego, A., Roman, F., Rubbia, C., Sarmento, R., Schillebeeckx, P., Schmidt, S., Schumann, D., Taín, J.L., Tagliente, G., Tsinganis, A., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Versaci, R., Vermeulen, M.J., Vlachoudis, V., Vlastou, V., Wallner, A., Ware, T., Weigand, M., Weiß, C., Wright, T., and Zç, Gec
Subjects: Nuclear reaction, Nuclear fission product, Fission, QC1-999, health care facilities, manpower, and services, education, Nuclear Theory, Nuclear physics, Neutron induced fission, Neutron, 7. Clean energy, 01 natural sciences, Physics and Astronomy (all), Angular distribution, 0103 physical sciences, CERN, Physics::Atomic and Molecular Clusters, n_TOF, 010306 general physics, Spectroscopy, Nuclear Experiment, health care economics and organizations, Physics, Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, Física [Àrees temàtiques de la UPC], Cross section, 010308 nuclear & particles physics, neutron induced fission, angular distribution, actinides, Actinide, Nuclear fission, Física nuclear
Abstract: Above 1 MeV of incident neutron energy the fission fragment angular distribution (FFAD) has generally a strong anisotropic behavior due to the combination of the incident orbital momentum and the intrinsic spin of the fissioning nucleus. This effect has to be taken into account for the efficiency estimation of devices used for fission cross section measurements. In addition it bears information on the spin deposition mechanism and on the structure of transitional states. We designed and constructed a detection device, based on Parallel Plate Avalanche Counters (PPAC), for measuring the fission fragment angular distributions of several isotopes, in particular 232Th. The measurement has been performed at n-TOF at CERN taking advantage of the very broad energy spectrum of the neutron beam. Fission events were recognized by back to back detection in coincidence in two position-sensitive detectors surrounding the targets. The detection efficiency, depending mostly on the stopping of fission fragments in backings and electrodes, has been computed with a Geant4 simulation and validated by the comparison to the measured case of 235U below 3 keV where the emission is isotropic. In the case of 232Th, the result is in good agreement with previous data below 10 MeV, with a good reproduction of the structures associated to vibrational states and the opening of second chance fission. In the 14 MeV region our data are much more accurate than previous ones which are broadly scattered. © Owned by the authors, published by EDP Sciences, 2013.
Published: 2013
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131. Fission croos-section measurements of U-233, Cm-245 and Am-241,243 at the CERN n_TPOF facility

Author: Calviani, M., Colonna, N., Belloni, F., H. Meaze, M., Abbondanno, U., Aerts, G., Álvarez, H., Álvarez-Velarde, F., Andriamonje, S., Andrzejewski, J., Assimakopoulo, P., Audouin, L., Badurek, G., Baumann, P., Becvar, F., Berthoumieux, E., Calviño, F., Cano-Ott, D., Capote, R., Carrillo De Albornoz, A., Cennini, P., Chepel, V., Chiaver, E., Cortes, G., Couture, A., Cox, J., Dahlfors, M., David, S., Dillman, I., Dolfini, R., Domingo-Pardo, C., Dridi, W., Duran, I., Eleftheriadis, C., Ferrant, L., Ferrari, Anthony, Ferreira-Marques, R., Frais-Koelbl, H., Fujii, K., Furman, W., Goncalves, I., González-Romero, E., Goverdovski, A., Gramegna, F., Griesmayer, E., Guerrero, C., Gunsing, F., Haas, B., Haight, R., Heil, M., Herrera-Martinez, A., Igashira, M., Isaev, S., Jericha, E., Käppeler, F., Kadi, Y., Karadimos, D., Karamanis, D., Kerveno, M., Ketlerov, V., Koehler, P., Konovalov, V., Kossionides, E., Krticka, M., Lampoudis, C., Leeb, H., Lindote, A., Lopes, I., Lozano, M., Lukic, S., Marganiec, J., Marques, L., Marrone, S., Martínez, T., Massimi, C., Mastinu, P., Mengoni, A., Milazzo, P.M., Moreau, C., Mosconi, M., Neves, F., Oberhummer, H., O'Brien, S., Oshima, M., 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., Praena, J., Quesada, J., Rauscher, T., Reifarth, R., Rosetti, M., Rubbia, C., Rudolf, G., Rullhusen, P., Salgado, J., Sarchiapone, L., Savvidis, I., Stephan, C., Tagliente, G., Tain, J.L., Tassan-Got, L., Tavora, L., Terlizzi, R., Vannini, G., Vaz, P., Ventura, A., Villamarin, D., Vicente, M.C., Vlachoudis, V., Vlastou, R., Voss, F., Walter, S., Wendler, H., Wiescher, M., Wisshak, K., 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, 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)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Biochimie et Physiologie Moléculaire des Plantes (BPMP), and Université de Montpellier (UM)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Institut National de la Recherche Agronomique (INRA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear Data, Am, Nuclear Theory, ENDF, Cm, neutron-induced fission reactions, n_TOF, ND2010, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract: Neutron-induced fission cross-sections of minor actinides have been measured using the n_TOF white neutron source at CERN, Geneva, as part of a large experimental program aiming at collecting new data relevant for nuclear astrophysics and for the design of advanced reactor systems. The measurements at n_TOF take advantage of the innovative features of the n_TOF facility, namely the wide energy range, high instantaneous neutron flux and good energy resolution. Final results on the fission cross-section of 233U, 245Cm and 243Am from thermal to 20 MeV are here reported, together with preliminary results for 241Am. The measurement have been performed with a dedicated Fast Ionization Chamber (FIC), a fission fragment detector with a very high efficiency, relative to the very well known cross-section of 235U, measured simultaneously with the same detector.
Published: 2011
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132. Past, present and future of the n_TOF facility at CERN

Author: F. Becvar, E. Lebbos, Nicola Colonna, F. Käppeler, F. Calviño, H. Leeb, G. Cortes, Vasilis Vlachoudis, J. Perkowski, D. Cano-Ott, Javier Praena, D. Tarrío, E. Mendoza, Ralf Nolte, D. Karadimos, F. Gunsing, M. Krtička, J. L. Tain, J. Andrzejewski, R. Sarmento, Roberto Losito, Cristian Massimi, C. Lederer, K. G. Ioannides, C. Carrapiço, R. Vlastou, P. Vaz, Srinivasan Ganesan, Carlos Guerrero, M. C. Ovejero, M. A. Cortés-Giraldo, Arnaud Ferrari, F. Gramegna, E. Berthoumieux, T. Martinez, Alberto Mengoni, M. Brugger, A. Pavlik, I. Dillmann, C. Domingo-Pardo, Zdenek Vykydal, C. Paradela, P. Cennini, Martin Heil, I. Duran, J. Marganiec, S. Andriamonje, B. Berthier, F. Cerutti, L. Audouin, P. M. Milazzo, S. Harrisopulos, V. Bécares, M. P. W. Chin, M. Mosconi, G. Vannini, A. Ventura, C. Rubbia, Manuel Lozano, V. Variale, E. Chiaveri, P. F. Mastinu, E. Jericha, M. Fernandez-Ordo~nez, C. Wei, S. Marrone, Rene Reifarth, G. Tagliente, E. Gonzalez-Romero, J. M. Quesada, L. Tassan-Got, Ralf Plag, I. F. Gonçalves, Anton Wallner, Fabio Belloni, G. Giubrone, M. B. Gomez Hornillos, Y. Kadi, Marco Calviani, M. Meaze, 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), 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), 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, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: General Physics and Astronomy, Proton Synchrotron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], European Organization for Nuclear Research. CERN, 01 natural sciences, 7. Clean energy, Nuclear physics, 0103 physical sciences, Nuclear astrophysics, Neutron, Spallation, 010306 general physics, Nuclear Experiment, Physics, Energies::Energia nuclear [Àrees temàtiques de la UPC], Range (particle radiation), Large Hadron Collider, 010308 nuclear & particles physics, Nuclear data, Nuclear energy, nuclear data, spallation, endf, Physics::Accelerator Physics, n_tof, Energia nuclear, nd2010, Laser beam quality
Abstract: The n_TOF spallation neutron facility is operating at CERN since 2001. Neutrons are produced with a very wide energy range, from thermal up to 1 GeV and with a very high instantaneous flux (10(5)n/cm(2)/pulse at 200 m from target) thanks to the high intensity (7 x 10(12) protons/pulse) and low repetition rate of the Proton Synchrotron (PS) which is delivering protons to a lead spallation target. The experimental area is located at 200 m from the target, resulting in a very good energy resolution and beam quality thanks to the adoption of an optimal collimation system. At the end of 2008 the n_TOF facility has resumed operation after a halt of 3 years due to technical issues. This contribution will outline the main physics results obtained by the facility since its inception in 1999, and show the importance of the measured nuclear data in the field of Nuclear Astrophysics and Nuclear Technology. Then it will present the future perspectives of the facility, aiming mainly in the direction of measuring highly radioactive samples, for which the facility has unique capabilities, with a lower background. Journal of the Korean Physical Society
Published: 2011
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133. Improved Neutron Capture Cross Section Measurements with the n_TOF Total Absorption Calorimeter

Author: Mendoza, E., Becares, V., Casado, A., Cano-Ott, D., Fernandez-Ordonez, M., Gonzalez-Romero, E., Guerrero, C., Martinez, T., Vidriales, J. J., Andrzejewski, J., Marganiec, J., Perkowski, J., Audouin, L., Berthier, B., Tassan-Got, L., Avrigeanu, V., Mirea, M., Becvar, F., Krticka, M., Belloni, F., Milazzo, P. M., Berthoumieux, E., Gunsing, F., Calvino, F., Cortes, G., Gomez-Hornillos, M. B., Andriamonje, S., Brugger, M., Calviani, M., Cerutti, F., Chiaveri, E., Ferrari, A., Kadi, Y., Lebbos, E., Losito, H., Vlachoudis, V., Carrapico, C., Goncalves, I. F., Saarmento, H., Vaz, P., Colonna, N., Marrone, S., Moinul, M., Tagliente, G., Variale, V., Dillmann, I., Domingo-Pardo, C., Heil, M., Duran, I., Paradela, C., Tarrio, D., Ganesan, S., Giubrone, G., Tain, J. L., Gramegna, F., Mastinu, P. F., Harrisopulos, S., Ioannides, K., Karadimos, D., Jericha, E., Leeb, H., Weiss, C., Kappeler, F., Lederer, C., Pavlik, A., Wallner, A., Lozano, M., Prena, J., Quesada, J. M., Massimi, C., Vannini, G., Mengoni, A., Ventura, A., Mosconi, M., Nolte, R., Vlastou, R., and n TOF Collaboration
Subjects: cross section, background, monte carlo, shielding, simulation, nuclear data, neutron, gamma ray, time of flight, calorimeter, n_tof, nd2010, total absorption, neutron capture
Abstract: The n_TOF collaboration operates a Total Absorption Calorimeter (TAC) [1] for measuring neutron capture cross-sections of low-mass and/or radioactive samples. The results obtained with the TAC have led to a substantial improvement of the capture cross sections of (237)Np and (240)Pu [2]. The experience acquired during the first measurements has allowed us to optimize the performance of the TAC and to improve the capture signal to background ratio, thus opening the way to more complex and demanding measurements on rare radioactive materials. The new design has been reached by a series of detailed Monte Carlo simulations of complete experiments and dedicated test measurements. The new capture setup will be presented and the main achievements highlighted. Journal of the Korean Physical Society
Published: 2011

134. The neutron time-of-flight facility n_TOF at CERN: Phase II

Author: F. Gunsing, S. Andriamonje, J. Andrzejewski, L. Audouin, V. Bécares, F. Bečvář, F. Belloni, B. Berthier, E. Berthoumieux, M. Brugger, M. Calviani, F. Calviño, D. Cano Ott, C. Carrapiço, P. Cennini, F. Cerutti, E. Chiaveri, M. Chin, N. Colonna, G. Cortés, M. A. Cortés Giraldo, I. Dillmann, C. Domingo Pardo, I. Duran, M. Fernández Ordóñez, A. Ferrari, K. Fraval, S. Ganesan, I. Giomataris, G. Giubrone, M. B. Gómez Hornillos, I. F. Gonçalves, E. González Romero, F. Gramegna, C. Guerrero, S. Harrisopulos, M. Heil, K. Ioannides, E. Jericha, Y. Kadi, F. Käppeler, D. Karadimos, M. Krtička, E. Lebbos, C. Lederer, H. Leeb, R. Losito, M. Lozano, J. Marganiec, S. Marrone, T. Martinez, P. F. Mastinu, M. Meaze, E. Mendoza, A. Mengoni, P. M. Milazzo, M. Mosconi, R. Nolte, T. Papaevangelou, C. Paradela, A. Pavlik, J. Perkowski, R. Plag, J. Praena, J. M. Quesada, T. Rauscher, R. Reifarth, F. Roman, C. Rubbia, R. Sarmento, G. Tagliente, J. L. Tain, D. Tarrìo, L. Tassan Got, L. Tlustos, V. Variale, P. Vaz, A. Ventura, V. Vlachoudis, R. Vlastou, Z. Vykydal, A. Wallner, C. Weiß, Floyd D. McDaniel, Barney L. Doyle, MASSIMI, CRISTIAN, VANNINI, GIANNI, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Floyd D. McDaniel and Barney L. Doyle, F. Gunsing, S. Andriamonje, J. Andrzejewski, L. Audouin, V. Bécare, F. Bečvář, F. Belloni, B. Berthier, E. Berthoumieux, M. Brugger, M. Calviani, F. Calviño, D. Cano-Ott, C. Carrapiço, P. Cennini, F. Cerutti, E. Chiaveri, M. Chin, N. Colonna, G. Corté, M. A. Cortés-Giraldo, I. Dillmann, C. Domingo-Pardo, I. Duran, M. Fernández-Ordóñez, A. Ferrari, K. Fraval, S. Ganesan, I. Giomatari, G. Giubrone, M. B. Gómez-Hornillo, I. F. Gonçalve, E. González-Romero, F. Gramegna, C. Guerrero, S. Harrisopulo, M. Heil, K. Ioannide, E. Jericha, Y. Kadi, F. Käppeler, D. Karadimo, M. Krtička, E. Lebbo, C. Lederer, H. Leeb, R. Losito, M. Lozano, J. Marganiec, S. Marrone, T. Martinez, C. Massimi, P. F. Mastinu, M. Meaze, E. Mendoza, A. Mengoni, P. M. Milazzo, M. Mosconi, R. Nolte, T. Papaevangelou, C. Paradela, A. Pavlik, J. Perkowski, R. Plag, J. Praena, J. M. Quesada, T. Rauscher, R. Reifarth, F. Roman, C. Rubbia, R. Sarmento, G. Tagliente, J. L. Tain, D. Tarrìo, L. Tassan-Got, L. Tlusto, G. Vannini, V. Variale, P. Vaz, A. Ventura, V. Vlachoudi, R. Vlastou, Z. Vykydal, A. Wallner, C. Weiß, Floyd D. McDaniel, and Barney L. Doyle
Subjects: Physics, Nuclear reaction, Neutrons, Energies::Energia nuclear [Àrees temàtiques de la UPC], n_TOF - CERN, Física [Àrees temàtiques de la UPC], Astrophysics::High Energy Astrophysical Phenomena, Nuclear physics, Neutron radiation, Neutron temperature, Radiation flux, neutron time-of-flight facility, Neutron flux, CERN, Neutron cross section, Physics::Accelerator Physics, Spallation, Neutron, n_TOF, Física nuclear, Nuclear Experiment, Neutron induced reactions Neutron time-of-flight facility
Abstract: Neutron-induced reactions are studied at the neutron time-of-flight facility n_TOF at CERN. The facility uses 6 similar to ns wide pulses of 20 GeV/c protons impinging on a lead spallation target. The large neutron energy range and the high instantaneous neutron flux combined with high resolution are among the key characteristics of the facility. After a first phase of data taking during the period 2001-2004, the facility has been refurbished with an upgraded spallation target and cooling system for a second phase of data taking which started in 2009. Since 2010, the experimental area at 185 m where the neutron beam arrives, has been modified into a worksector of type A, allowing the extension of the physics program to include neutron-induced reactions on radioactive isotopes
Published: 2011
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135. Fission Cross-section Measurements of (233)U, (245)Cm and (241,243)Am at CERN n_TOF Facility

Author: Calviani, M., Andriamonje, S., Chiaveri, E., Vlachoudis, V., Colonna, N., Meaze, M. H., Marrone, S., Tagliente, G., Terlizzi, R., Belloni, F., Abbondanno, U., Fujii, K., Milazzo, P. M., Moreau, C., Aerts, G., Berthoumieux, E., Dridi, W., Gunsing, F., Pancin, J., Perrot, L., Plukis, A., Alvarez, H., Duran, I., Paradela, C., Alvarez-Velarde, F., Cano-Ott, D., Gonzalez-Romero, E., Guerrero, C., Martinez, T., Villamarin, D., Vicente, M. C., Andrzejewski, J., Marganiec, J., Assimakopoulos, P., Karadimos, D., Karamanis, D., Papachristodoulou, C., Patronis, N., Audouin, L., David, S., Ferrant, L., Isaev, S., Stephan, C., Tassan-Got, L., Badurek, G., Jericha, E., Leeb, H., Oberhummer, H., Pigni, M. T., Baumann, P., Kerveno, M., Lukic, S., Rudolf, G., Becvar, F., Krticka, M., Calvino, F., Capote, R., De Albornoz, A. C., Marques, L., Salgado, J., Tavora, L., Vaz, P., Cennini, P., Dahlfors, M., Ferrari, A., Gramegna, F., Herrera-Martinez, A., Kadi, Y., Mastinu, P., Praena, J., Sarchiapone, L., Wendler, H., Chepel, V., Ferreira-Marques, R., Goncalves, I., Lindote, A., Lopes, I., Neves, F., Cortes, G., Poch, A., Pretel, C., Couture, A., Cox, J., O'Brien, S., Wiescher, M., Dillman, I., Heil, M., Kaeppeler, F., Mosconi, M., Plag, R., Voss, F., Walter, S., Wisshak, K., Dolfini, R., Rubbia, C., Domingo-Pardo, C., Tain, J. L., Eleftheriadis, C., Savvidis, I., Frais-Koelbl, H., Griesmayer, E., Furman, W., Konovalov, V., Goverdovski, A., Ketlerov, V., Haas, B., Haight, R., Reifarth, R., Igashira, M., Koehler, P., Kossionides, E., Lampoudis, C., Lozano, M., Quesada, J., Massimi, C., Vannini, G., Mengoni, A., Oshima, M., Papadopoulos, C., Vlastou, R., Pavlik, A., Pavlopoulos, P., Plompen, A., Rullhusen, P., Rauscher, T., Rosetti, M., Ventura, A., and n TOF Collaboration
Subjects: am, endf, cm, n_tof, neutron-induced fission reactions, nd2010, nuclear data
Abstract: Neutron-induced fission cross-sections of minor actinides have been measured using the n_TOF white neutron source at CERN. Geneva, as part of a large experimental program aiming at collecting new data relevant for nuclear astrophysics and for the design of advanced reactor systems. The measurements at n_TOF take advantage of the innovative features of the n_TOF facility, namely the wide energy range, high instantaneous neutron flux and good energy resolution. Final results on the fission cross-section of (233)U, (245)cm and (243)Am from thermal to 20 MeV are here reported, together with preliminary results for (241)Am. The measurement have been performed with a dedicated Fast Ionization Chamber (FIC), a fission fragment detector with a very high efficiency, relative to the very well known cross-section of (235)U, measured simultaneously with the same detector. Journal of the Korean Physical Society
Published: 2011

136. Characterization of the New n_TOF Neutron Beam: Fluence, Profile and Resolution

Author: Guerrero, C., Becares, V., Cano-Ott, D., Fernandez-Ordonez, M., Gonzalez-Romero, E., Martin-Fuertes, F., Martinez, T., Mendoza, E., Pina, G., Quinones, J., Vlachoudis, V., Calviani, M., Andriamonje, S., Brugger, M., Cerutti, F., Chiaveri, E., Ferrari, A., Kadi, Y., Lebbos, E., Berthoumieux, E., Gunsing, F., Andrzejewski, J., Marganiec, J., Perkowski, J., Audouin, L., Berthier, B., Tassan-Got, L., Avrigeanu, V., Mirea, M., Becvar, F., Krticka, M., Belloni, F., Milazzo, P. M., Calvino, F., Cortes, G., Gomez-Hornillos, M. B., Carrapico, C., Goncalves, I. F., Sarmento, R., Vaz, P., Colonna, N., Marrone, S., Moinul, M., Tagliente, G., Variale, V., Dillmann, I., Domingo-Pardo, C., Heil, M., Duran, I., Paradela, C., Tarrio, D., Ganesan, S., Giubrone, G., Tain, J. L., Gramegna, F., Mastinu, P. F., Harrisopulos, S., Ioannides, K., Karadimos, D., Jericha, E., Leeb, H., Weiss, C., Kappeler, F., Lederer, C., Pavlik, A., Wallner, A., Lozano, M., Praena, J., Quesada, J. M., Massimi, C., Vannini, G., Mengoni, A., Ventura, A., Mosconi, M., Nolte, R., Vlastou, R., and N TOF Collaboration
Subjects: facility, n_tof, cross sections, neutron beam, time-of-flight, nuclear data
Abstract: After a halt of four years, the n_TOF spallation neutron facility at CERN has resumed operation in November 2008 with a new spallation target characterized by an improved safety and engineering design, resulting in a more robust overall performance and efficient cooling. The first measurement during the 2009 run has aimed at the full characterization of the neutron beam. Several detectors, such as calibrated fission chambers, the n_TOF Silicon Monitor, a MicroMegas detector with (10)B and (235)U samples, as well as liquid and solid scintillators have been used in order to characterize the properties of the neutron fluence. The spatial profile of the beam has been studied with a specially designed "X-Y" MicroMegas which provided a 2D image of the beam as a function of neutron energy. Both properties have been compared with simulations performed. with the FLUKA code. The characterization of the resolution function is based on results from simulations which have been verified by the study of narrow capture resonances. of (56)Fe, which were measured as part of a new campaign of (n,gamma) measurements on Fe and Ni isotopes. Journal of the Korean Physical Society
Published: 2011

137. Neutron Capture Measurements on Minor Actinides at the n_TOF Facility at CERN: Past, Present and Future

Author: Cano-Ott, D., Alvarez-Velarde, F., Gonzalez-Romero, E., Guerrero, C., Martinez, T., Mendoza, E., Villamarin, D., Vicente, M. C., Abbondanno, U., Colonna, N., Meaze, M. H., Marrone, S., Tagliente, G., Terlizzi, R., Belloni, F., Fujii, K., Milazzo, P. M., Moreau, C., Andriamonje, S., Calviani, M., Chiaveri, E., Kadi, Y., Vlachoudis, V., Andrzejewski, J., Marganiec, J., Assimakopoulos, P., Karadimos, D., Karamanis, D., Papachristodoulou, C., Patronis, N., Audouin, L., David, S., Ferrant, L., Isaev, S., Stephan, C., Tassan-Got, L., Badurek, G., Jericha, E., Leeb, H., Oberhummer, H., Pigni, M. T., Baumann, P., Kerveno, M., Lukic, S., Rudolf, G., Becvar, F., Krticka, M., Calvino, F., Frais-Koelbl, H., Griesayer, E., Capote, R., Lozano, M., Quesada, J., Mengoni, A., De Albornoz, A. C., Maroues, L., Salgado, J., Tavora, L., Vaz, P., Cennini, P., Dahlfors, M., Ferrari, A., Gramegna, F., Herrera-Martinez, A., Mastinu, P., Praena, J., Sarchiapone, L., Wiendler, H., Chepel, V., Ferreira-Marques, R., Goncalves, I., Lindote, A., Lopes, I., Neves, F., Aerts, G., Berthoumieux, E., Dridi, W., Gunsing, F., Pancin, J., Perrot, L., Plukis, A., Lampoudis, C., Cortes, G., Poch, A., Pretel, C., Couture, A., Cox, J., O'Brien, S., Wiescher, M., Dillman, I., Heil, M., Kappeler, F., Mosconi, M., Plag, R., Voss, F., Walter, S., Wisshak, K., Dolfini, R., Rubbia, C., Domingo-Pardo, C., Tain, J. L., Eleftheriadis, C., Savvidis, I., Furman, W., Konovalov, V., Goverdovski, A., Ketlerov, V., Alvarez, H., Duran, I., Paradela, C., Haas, B., Haight, R., Reifarth, R., Igashira, M., Koehler, P., Kossionides, E., Massimi, C., Vannini, G., Oshima, M., Papadopoulos, C., Vlastou, R., Pavlik, A., Pavlopoulos, P., Plompen, A., Rullhusen, P., Rauscher, T., Rosetti, M., Ventura, A., and n TOF Collaboration
Subjects: nuclear waste, ads, cross section, actinides, plutonium, tac, generation iv, total absorption calorimeter, transmutation, nuclear data, nuclear energy, americium, uranium, accelerator driven system, n_tof, barium fluoride, nuclear reactor, neutron capture
Abstract: The successful development of advanced nuclear systems for sustainable energy production and nuclear waste management depends on high quality nuclear data libraries. Recent sensitivity studies and reports [1-3] have identified the need for substantially improving the accuracy of neutron cross-section data for minor actinides. The n_TOF collaboration has initiated an ambitious experimental program for the measurement of neutron capture cross sections of minor actinides. Two experimental setups have been constructed for this purpose: a Total Absorption Calorimeter (TAC) [4] for measuring neutron capture cross-sections of low-mass and/or radioactive samples and a set of two low neutron sensitivity C(6)D(6) detectors for the less radioactive materials. Journal of the Korean Physical Society
Published: 2011

138. Study of Photon Strength Function of Actinides: the Case of (235)U, (238)Np and (241)Pu

Author: Guerrero, C., Alvarez-Velarde, F., Ano-Ott, D. C., Martinez, T., Mendoza, E., Villamarin, D., Colonna, N., Meaze, M. H., Marrone, S., Tagliente, G., Terlizzi, R., Belloni, F., Abbondanno, U., Fujii, K., Milazzo, P. M., Moreau, C., Aerts, G., Berthoumieux, E., Dridi, W., Gunsing, F., Pancin, J., Perrot, L., Plukis, A., Alvarez, H., Duran, I., Paradela, C., Andriamonje, S., Calviani, M., Chiaveri, E., Gonzalez-Romero, E., Kadi, Y., Vicente, M. C., Vlachoudis, V., Andrzejewski, J., Marganiec, J., Assimakopoulos, P., Karadimos, D., Karamanis, D., Papachristodoulou, C., Patronis, N., Audouin, L., David, S., Ferrant, L., Isaev, S., Stephan, C., Tassan-Got, L., Badurek, G., Jericha, E., Leeb, H., Oberhummer, H., Pigni, M. T., Baumann, P., Kerveno, M., Lukic, S., Rudolf, G., Becvar, F., Krticka, M., Calvino, F., Capote, R., De Albornoz, A. C., Marques, L., Salgado, J., Tavora, L., Vaz, P., Cennini, P., Dahlfors, M., Ferrari, A., Gramegna, F., Herrera-Martinez, A., Mastinu, P., Praena, J., Sarchiapone, L., Wendler, H., Chepel, V., Ferreira-Marques, R., Goncalves, I., Lindote, A., Lopes, I., Neves, F., Cortes, G., Poch, A., Pretel, C., Couture, A., Cox, J., O'Brien, S., Wiescher, M., Dillman, I., Kappeler, F., Mosconi, M., Plag, R., Voss, F., Walter, S., Wisshak, K., Dolfini, R., Rubbia, C., Domingo-Pardo, C., Tain, J. L., Eleftheriadis, C., Savvidis, I., Frais-Koelbl, H., Griesmayer, E., Furman, W., Konovalov, V., Goverdovski, A., Ketlerov, V., Haas, B., Haight, R., Reifarth, R., Heil, M., Igashira, M., Koehler, P., Kossionides, E., Lampoudis, C., Lozano, M., Quesada, J., Massimi, C., Vannini, G., Mengoni, A., Oshima, M., Papadopoulos, C., Vlastou, R., Pavlik, A., Pavlopoulos, P., Plompen, A., Rullhusen, P., Rauscher, T., Rosetti, M., Ventura, A., and N TOF Collaboration
Subjects: pygmy, parameter, resonance, photon/gamma strength functions, spectra, nuclei, scissor mode, n_tof, tac, total absorption calorimeter, systematics, neutron capture
Abstract: The decay from excited levels in medium and heavy nuclei can be described in a statistical approach by means of Photon Strength Functions and Level Density distributions. The study of electromagnetic cascades following neutron capture based on the use of high efficiency detectors has been shown to be well suited for probing the properties of the Photon Strength Function of heavy (high level density) and/or radioactive (high background) nuclei. In this work we have investigated for the first time the validity of the recommended PSF of actinides, in particular (235)U, (238)Np and (241)Pu. Our study includes the search for resonance structures in the PSF below S(n) and draws conclusions regarding their existence and their characteristics in terms of energy, width and electromagnetic nature. Journal of the Korean Physical Society
Published: 2011

139. Measurement of the neutron capture cross-section of 236U

Author: Barbagallo, Massimo, Belloni, Fabio, Berthoumieux, Eric, Calviño Tavares, Francisco|||0000-0002-7198-4639, Cortés Rossell, Guillem Pere|||0000-0002-3648-5826, 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, Física [Àrees temàtiques de la UPC], Cross section, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, CERN, Nuclear physics, n_TOF, Física nuclear, Nuclear reaction, Nuclear Experiment
Abstract: Proposal: Measurement of the neutron capture cross-section of 236U
Published: 2010

140. A new CVD Diamond Mosaic-Detector for (n, α ) Cross-Section Measurements at the n TOF Experiment at CERN

Author: Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Cortés Giraldo, Miguel Antonio, Weiss, Christina, Griesmayer, E., Guerrero Sánchez, Carlos, Barbagallo, M., Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Cortés Giraldo, Miguel Antonio, Weiss, Christina, Griesmayer, E., Guerrero Sánchez, Carlos, and Barbagallo, M.
Abstract: At the n\_TOF experiment at CERN a dedicated single-crystal chemical vapor deposition (sCVD) Diamond Mosaic-Detector has been developed for (n,alpha) cross-section measurements. The detector, characterized by an excellent time and energy resolution, consists of an array of 9 sCVD diamond diodes. The detector has been characterized and a cross-section measurement has been performed for the 59Ni(n,alpha)56Fe reaction in 2012. The characteristics of the detector, its performance and the promising preliminary results of the experiment are presented.
Published: 2013

141. A new CVD diamond mosaic-detector for (n, ) cross-section measurements at the n_TOF experiment at CERN

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, Weiss, Christina, Griesmayer, E., Guerrero, C., Altstadt, S., Andrzejewski, J., Audouin, L., Badurek, G., Barbagallo, M., Bécares, V., Becvar, F., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Riego Pérez, Albert, 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, Weiss, Christina, Griesmayer, E., Guerrero, C., Altstadt, S., Andrzejewski, J., Audouin, L., Badurek, G., Barbagallo, M., Bécares, V., Becvar, F., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, and Riego Pérez, Albert
Abstract: At then_TOFexperimentatCERNadedicatedsingle-crystalchemicalvapordeposition(sCVD)Diamond Mosaic-Detectorhasbeendevelopedfor(n,α) cross-sectionmeasurements.Thedetector,characterized by anexcellenttimeandenergyresolution,consistsofanarrayof9sCVDdiamonddiodes.Thedetector has beencharacterizedandacross-sectionmeasurementhasbeenperformedforthe 59Ni(n,α)56Fe reaction in2012.Thecharacteristicsofthedetector,itsperformanceandthepromisingpreliminary results oftheexperimentarepresented., Postprint (published version)
Published: 2013

142. Radiative capture on 242Pu for MOX fuel reactors

Author: Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Guerrero, Carlos, Balibrea-Correa, J., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Guerrero, Carlos, Balibrea-Correa, J., Calviño Tavares, Francisco, and Cortés Rossell, Guillem Pere
Abstract: Proposal: Radiative capture on 242Pu for MOX fuel reactors, The use of MOX fuel (mixed-oxide fuel made of UO2 and PuO2) in nuclear reactors allows substituting a large fraction of the enriched Uranium by Plutonium reprocessed from spent fuel. Indeed around 66% of the plutonium from spent fuel is made of 239Pu and 241Pu, which are fissile in thermal reactors. A typical reactor of this type uses a fuel with 7% reprocessed Pu and 93% depleted U, thus profiting from both the spent fuel and the remaining 238U following the 235U enrichment. With the use of such new fuel compositions rich in Pu the better knowledge of the capture and fission cross sections of the Pu isotopes becomes very important. This is clearly stated in the recent OECD NEA’s “High Priority Request List” and in the WPEC-26 “Uncertainty and target accuracy assessment for innovative systems using recent covariance data evaluations” report. In particular, a new series of cross section evaluations have been recently carried out jointly by the European (JEFF) and United States (ENDF) nuclear data agencies. As the new evaluations on 240Pu and 241Am have been already completed, 242Pu is the next to be reevaluated, and the scarceness of capture data (only two TOF measurements from 1973 and 1976 are available and disagree with each other) calls for a new time-of flight capture cross section measurement. This will be the first measurement in 40 years and, with the use of more advanced techniques, shall provide a more reliable and accurate result. We propose to measure the capture cross section of 242Pu in the region from thermal up to at least 60 keV, aiming for a high energy limit of 500 keV. The experiment would make use of an array of 4 low neutron sensitivity C6D6 detectors and be carried out at the n_TOF EAR-1 (185 m flight path) measuring station. Compared to the current uncertainty of 35%, this measurement aims at an improved accuracy between 7% and 12% depending on the energy region., Preprint
Published: 2013

143. Angular distribution in the neutron-induced fission of actinides

Author: Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Leong, L.S., Tassan Got, Laurence, Tarrío, D., 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, Leong, L.S., Tassan Got, Laurence, Tarrío, D., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, and Gómez Hornillos, María Belén
Abstract: Above 1MeV of incident neutron energy the fission fragment angular distribution (FFAD) has generally a strong anisotropic behavior due to the combination of the incident orbital momentum and the intrinsic spin of the fissioning nucleus. This effect has to be taken into account for the efficiency estimation of devices used for fission cross section measurements. In addition it bears information on the spin deposition mechanism and on the structure of transitional states. We designed and constructed a detection device, based on Parallel Plate Avalanche Counters (PPAC), for measuring the fission fragment angular distributions of several isotopes, in particular 232Th. The measurement has been performed at n_TOF at CERN taking advantage of the very broad energy spectrum of the neutron beam. Fission events were recognized by back to back detection in coincidence in two position-sensitive detectors surrounding the targets. The detection efficiency, depending mostly on the stopping of fission fragments in backings and electrodes, has been computed with a Geant4 simulation and validated by the comparison to the measured case of 235U below 3 keV where the emission is isotropic. In the case of 232Th, the result is in good agreement with previous data below 10MeV, with a good reproduction of the structures associated to vibrational states and the opening of econd chance fission. In the 14MeV region our data are much more accurate than previous ones which are broadly scattered., Postprint (published version)
Published: 2013

144. Neutron research at the N_TOF facility (CERN): Results and perspectives

Author: Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Altstadt, Sebastian, Colonna, Nicola, Andrzejewski, Józef, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Altstadt, Sebastian, Colonna, Nicola, Andrzejewski, Józef, Calviño Tavares, Francisco, and Cortés Rossell, Guillem Pere
Abstract: n the first ten years of operation, the neutron time-of-flight facility n_TOF at CERN has produced a large body of new and accurate data on neutron capture and fission cross sections, relevant to Nuclear Astrophysics and advanced nuclear technologies. In the next phase, with the construction of a second experimental area with a shorted flight path, the focus of the Collaboration will partially shift from high-resolution measurements of stable or long-lived isotopes, to high-flux measurements of isotopes of relatively short half-life, very low-cross sections, or available in very small quantities. The main results obtained so far at n_TOF and the future perspectives are here presented., Postprint (published version)
Published: 2013

145. Neutron induced fission cross section measurements aimed at nuclear technology development

Author: Belloni, Francesca, Milazzo, Paolo Maria, and Rui, Rinaldo
Subjects: neutroni, neutron, fissione, FIS/04 FISICA NUCLEARE E SUBNUCLEARE, Nuclear Theory, SCUOLA DI DOTTORATO DI RICERCA IN FISICA, fission, camera di fissione a ionizzazione, Nuclear Physics - Experiment, n_TOF, fission ionization chamber, Nuclear Experiment
Abstract: 2008/2009 Neutron induced fission cross sections of 233U, 238U, 241Am, 243Am and 245Cm in the energy range between 500 keV and 20 MeV obtained at the n_TOF Neutron Time of Flight facility at CERN (Geneve) are presented. Fission fragments had been detected by a gas counter with good discrimination between nuclear fission products and background events. A comparison between the extracted cross sections, previous experimental results and evaluated libraries is reported. In questa tesi sono presentate le sezoni d'urto indotte da neutroni di energia compresa tra 500 KeV e 20 MeV su 233U, 238U, 241Am, 243Am e 245Cm ottenute alla facility di tempo di volo n_TOF al CERN (Geneve). I frammenti di fissione sono stati rivelati da un contatore a gas con una buona capacit\`a di discriminare i prodotti di fissione dagli eventi di background. La tesi riporta un paragone tra le sezioni estratte, i dati sperimentali ottenuti in passato da altri gruppi e le principali librerie valutative. 1980
Published: 2010

146. Astrophysics at n-TOF facility at CERN

Author: G. Vannini, L. Perrot, Alfredo Ferrari, R. Ferreira-Marques, J. Salgado, A. Poch, P. E. Koehler, I. Goncalves, L. Tavora, Ralf Plag, Thomas Rauscher, M. Embid-Segura, E. Jericha, R. Vlastou, I. Duran, Sara Bisterzo, M. Kerveno, M. Krtička, F. Calviño, A. Herrera-Martinez, N. Patronis, C. Santos, E. Kossionides, Manuel Lozano, D. Karadimos, C. Pretel, W.I. Furman, V. Chepel, P. Rullhusen, J. Cox, T. Martinez, Javier Praena, F. Bečvář, Rene Reifarth, P. Baumann, I. Dillman, G. Aerts, Masayuki Igashira, Laurent Tassan-Got, A. Lindote, S. David, K. Fujii, Marco Calviani, P. Pavlopoulos, G. Cortes, G. Tagliente, P. Cennini, J. M. Quesada, S. Walter, A. J. M. Plompen, R. Gallino, C. Carrapiço, C Papadopoulos, E. Berthoumieux, Alberto Mengoni, G. Rudolf, I. Lopes, M. Mosconi, E. Gonzalez-Romero, Fabio Belloni, B. Haas, P. M. Milazzo, Michael Heil, F. Alvarez-Velarde, C. Stephan, L. Sarchiapone, Roberto Capote, R. Terlizzi, Gerald Badurek, A. Plukis, F. Neves, W. Dridi, Carlos Guerrero, D. Karamanis, S. Marrone, F. Gramegna, H. Álvarez, Heinz Oberhummer, J. L. Tain, J. Marganiec, S. Andriamonje, I. Savvidis, J. Andrzejewski, Carlo Rubbia, V. Vlachoudis, P. F. Mastinu, M. C. Vincente, C. Papachristodoulou, U. Abbondanno, J. Pancin, E. Chiaveri, D. Cano-Ott, R. C. Haight, M. Dahlfors, L. Audouin, Michael Wiescher, P. Vaz, D. Villamarin, Marco T. Pigni, Alberto Ventura, Aaron Couture, A. Pavlik, C. Domingo-Pardo, C. Eleftheriadis, C. Paradela, S. Lukic, Yacine Kadi, F. Käppeler, F. Voss, Nicola Colonna, H. Leeb, K. Wisshak, H. Wendler, F. Gunsing, Cristian Massimi, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, G Tagliente, U Abbondanno, G Aert, H Alvarez, F Alvarez-Velarde, S Andriamonje, J Andrzejewski, L Audouin, G Badurek, P Baumann, F Bečvář, F Belloni, E Berthoumieux, S Bisterzo, F Calviño, M Calviani, D Cano-Ott, R Capote, C Carrapiço, P Cennini, V Chepel, E Chiaveri, N Colonna, G Corte, A Couture, J Cox, M Dahlfor, S David, I Dillman, C Domingo-Pardo, W Dridi, I Duran, C Eleftheriadi, M Embid-Segura, A Ferrari, R Ferreira-Marque, K Fujii, W Furman, R Gallino, I Goncalve, E Gonzalez-Romero, F Gramegna, C Guerrero, F Gunsing, B Haa, R Haight, M Heil, A Herrera-Martinez, M Igashira, E Jericha, F Käppeler, Y Kadi, D Karadimo, D Karamani, M Kerveno, P Koehler, E Kossionide, M Krtička, H Leeb, A Lindote, I Lope, M Lozano, S Lukic, J Marganiec, S Marrone, T Martinez, C Massimi, P Mastinu, A Mengoni, P M Milazzo, M Mosconi, F Neve, H Oberhummer, J Pancin, C Papachristodoulou, C Papadopoulo, C Paradela, N Patroni, A Pavlik, P Pavlopoulo, L Perrot, M T Pigni, R Plag, A Plompen, A Pluki, A Poch, J Praena, C Pretel, J Quesada, T Rauscher, R Reifarth, C Rubbia, G Rudolf, P Rullhusen, J Salgado, C Santo, L Sarchiapone, I Savvidi, C Stephan, J L Tain, L Tassan-Got, L Tavora, R Terlizzi, G Vannini, P Vaz, A Ventura, D Villamarin, M C Vincente, V Vlachoudi, R Vlastou, F Vo, S Walter, H Wendler, M Wiescher, and K Wisshak
Subjects: s proce, Nuclear reaction, History, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Nuclear physics, Astrophysics, Education, CERN, Neutron cross section, Nuclear astrophysics, Neutron, Spallation, n_TOF, Nuclear Experiment, Physics, Neutrons, Energies::Energia nuclear [Àrees temàtiques de la UPC], Física [Àrees temàtiques de la UPC], nucleosynthesis, Computer Science Applications, Neutron source, Physics::Accelerator Physics, Física nuclear, s-process, Nucleosynthesis, Spallation Neutron Source
Abstract: The neutron time of flight (n_TOF) facility at CERN is a spallation neutron source with white neutron energy spectrum (from thermal to several GeV), covering the full energy range of interest for nuclear astrophysics, in particular for measurements of the neutron capture cross section required in s-process nucleosynthesis. This contribution presents an overview on the astrophysical program carried on at the n_TOF facility, the main results and their implications.
Published: 2010

147. Measurement of the 24,25,26Mg(n, gamma) reaction cross-section at n-TOF

Author: Massimi, Cristian, Andriamonje, S., Andrzejewski, Józef, 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: Neutrons, Energies::Energia nuclear [Àrees temàtiques de la UPC], cross section, Física [Àrees temàtiques de la UPC], CERN, Nuclear physics, n_TOF, Física nuclear, Nuclear reaction, Astrophysics, Nucleosynthesis, Nucleosíntesi
Abstract: We have measured the neutron-induced capture cross-section of the importants-process isotopesof magnesium. The measurement has been performed at the neutron time-of-flight facility n_TOFat CERN. From a preliminary analysis of this new set of capture data we find that our resultsseem to be significantly lower than previous data and evaluations. We have also investigated thecontribution of the direct capture component to the Maxwellian-averaged capture cross section
Published: 2010

148. Astrophysics at n-TOF facility

Author: G. Tagliente, U. Abbondanno, G. Aerts, H. Alvarez, F. Alvarez Velarde, S. Andriamonje, J. Andrzejewski, P. Assimakopoulos, L. Audouin, G. Badurek, P. Baumann, F. Bečvář, F. Belloni, E. Berthoumieux, F. Calviño, M. Calviani, D. Cano Ott, R. Capote, C. Carrapiço, P. Cennini, V. Chepel, E. Chiaveri, N. Colonna, G. Cortes, A. Couture, J. Cox, M. Dahlfors, S. David, I. Dillman, C. Domingo Pardo, W. Dridi, I. Duran, C. Eleftheriadis, M. Embid Segura, L. Ferrant, A. Ferrari, R. Ferreira Marques, K. Fujii, W. Furman, I. Goncalves, E. Gonzalez Romero, F. Gramegna, C. Guerrero, F. Gunsing, M. Heil, A. Herrera Martinez, E. Jericha, F. Käppeler, Y. Kadi, D. Karadimos, D. Karamanis, M. Kerveno, E. Kossionides, M. Krtička, C. Lamboudis, H. Leeb, A. Lindote, I. Lopes, M. Lozano, S. Lukic, J. Marganiec, S. Marrone, T. Martinez, P. Mastinu, A. Mengoni, P. M. Milazzo, M. Mosconi, F. Neves, H. Oberhummer, S. O’Brien, J. Pancin, C. Papachristodoulou, C. Paradela, N. Patronis, A. Pavlik, P. Pavlopoulos, L. Perrot, R. Plag, A. Plukis, A. Poch, J. Praena, C. Pretel, J. Quesada, R. Reifarth, C. Rubbia, G. Rudolf, J. Salgado, C. Santos, L. Sarchiapone, I. Savvidis, C. Stephan, J. L. Tain, L. Tassan Got, L. Tavora, R. Terlizzi, P. Vaz, A. Ventura, D. Villamarin, M. C. Vincente, V. Vlachoudis, R. Vlastou, F. Voss, S. Walter, M. Wiescher, K. Wisshak, Ricardo Alarcon, Phil Cole, Andres J. Kreiner, Hugo F. Arellano, MASSIMI, CRISTIAN, VANNINI, GIANNI, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, European Commission (EC), Ricardo Alarcon , Phil Cole , Andres J. Kreiner and Hugo F. Arellano, G. Tagliente, U. Abbondanno, G. Aert, H. Alvarez, F. Alvarez-Velarde, S. Andriamonje, J. Andrzejewski, P. Assimakopoulo, L. Audouin, G. Badurek, P. Baumann, F. Bečvář, F. Belloni, E. Berthoumieux, F. Calviño, M. Calviani, D. Cano-Ott, R. Capote, C. Carrapiço, P. Cennini, V. Chepel, E. Chiaveri, N. Colonna, G. Corte, A. Couture, J. Cox, M. Dahlfor, S. David, I. Dillman, C. Domingo-Pardo, W. Dridi, I. Duran, C. Eleftheriadi, M. Embid-Segura, L. Ferrant, A. Ferrari, R. Ferreira-Marque, K. Fujii, W. Furman, I. Goncalve, E. Gonzalez-Romero, F. Gramegna, C. Guerrero, F. Gunsing, M. Heil, A. Herrera-Martinez, E. Jericha, F. Käppeler, Y. Kadi, D. Karadimo, D. Karamani, M. Kerveno, E. Kossionide, M. Krtička, C. Lamboudi, H. Leeb, A. Lindote, I. Lope, M. Lozano, S. Lukic, J. Marganiec, S. Marrone, T. Martinez, C. Massimi, P. Mastinu, A. Mengoni, P. M. Milazzo, M. Mosconi, F. Neve, H. Oberhummer, S. O’Brien, J. Pancin, C. Papachristodoulou, C. Paradela, N. Patroni, A. Pavlik, P. Pavlopoulo, L. Perrot, R. Plag, A. Pluki, A. Poch, J. Praena, C. Pretel, J. Quesada, R. Reifarth, C. Rubbia, G. Rudolf, J. Salgado, C. Santo, L. Sarchiapone, I. Savvidi, C. Stephan, J. L. Tain, L. Tassan-Got, L. Tavora, R. Terlizzi, G. Vannini, P. Vaz, A. Ventura, D. Villamarin, M. C. Vincente, V. Vlachoudi, R. Vlastou, F. Vo, S. Walter, M. Wiescher, K. Wisshak, Ricardo Alarcon, Phil Cole, Andres J. Kreiner, and Hugo F. Arellano
Subjects: Physics, Neutron cross-section, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Astrophysics, Neutron scattering, Neutron temperature, Nuclear physics, Neutron capture, Elemental Nucleosynthesi, N_TOF, Nuclear astrophysics, Neutron cross section, r-process, Neutron, n_TOF CERN, s-process, Nuclear Experiment, s process
Abstract: Heavy elements with Z ≥ 30 are made by neutron capture reactions during stellar He burning and presumably in supernovae. This contribution deals mainly with the slow neutron capture (s) process which is responsible for about one half of the abundances in the mass region between Fe and Bi. The slow time scale implies that the reaction path of this process involves mostly stable isotopes which can be studied in detail in laboratory experiments. The neutron time of flight (n_TOF) facility at CERN is a neutron spallation source, its white neutron energy spectrum ranges from thermal to several MeV, covering the full energy range of interest for nuclear astrophysics, in particular for measurements of the neutron capture cross section required in s-process nucleosynthesis. This contribution gives an overview on the astrophysical program made at n_TOF facility, the results and the implications will be considered. European Commission (EC) FIKW-CT-2000-00107
Published: 2010

149. Study of Neutron-Induced Fission Cross Sections of U, Am, and Cm at ṉTOF

Author: P. M. Milazzo, U. Abbondanno, G. Aerts, H. Alvarez, F. Alvarez Velarde, S. Andriamonje, J. Andrzejewski, P. Assimakopoulos, L. Audouin, G. Badurek, P. Baumann, F. Becčvář, F. Belloni, E. Berthoumieux, F. Calviño, M. Calviani, D. Cano Ott, R. Capote, C. Carrapiço, P. Cennini, V. Chepel, E. Chiaveri, N. Colonna, G. Cortes, A. Couture, J. Cox, M. Dahlfors, S. David, I. Dillman, C. Domingo Pardo, W. Dridi, I. Duran, C. Eleftheriadis, M. Embid Segura, L. Ferrant, A. Ferrari, R. Ferreira Marques, K. Fujii, W. Furman, I. Goncalves, E. Gonzalez Romero, F. Gramegna, C. Guerrero, F. Gunsing, M. Heil, A. Herrera Martinez, E. Jericha, F. Käppeler, Y. Kadi, D. Karadimos, D. Karamanis, M. Kerveno, P. Koehler, E. Kossionides, M. Krtička, C. Lamboudis, H. Leeb, A. Lindote, I. Lopes, M. Lozano, S. Lukic, J. Marganiec, S. Marrone, T. Martinez, P. Mastinu, A. Mengoni, M. Mosconi, F. Neves, H. Oberhummer, S. O’Brien, J. Pancin, C. Papachristodoulou, C. Paradela, N. Patronis, A. Pavlik, P. Pavlopoulos, L. Perrot, R. Plag, A. Plukis, A. Poch, J. Praena, C. Pretel, J. Quesada, R. Reifarth, C. Rubbia, G. Rudolf, J. Salgado, C. Santos, L. Sarchiapone, I. Savvidis, C. Stephan, G. Tagliente, J. L. Tain, L. Tassan Got, L. Tavora, R. Terlizzi, P. Vaz, A. Ventura, D. Villamarin, M. C. Vincente, V. Vlachoudis, R. Vlastou, F. Voss, S. Walter, M. Wiescher, K. Wisshak, Ricardo Alarcon, Phil Cole, Andres J. Kreiner, Hugo F. Arellano, MASSIMI, CRISTIAN, VANNINI, GIANNI, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, European Commission Joint Research Centre European Community (EC), Ricardo Alarcon , Phil Cole , Andres J. Kreiner and Hugo F. Arellano, P. M. Milazzo, U. Abbondanno, G. Aert, H. Alvarez, F. Alvarez-Velarde, S. Andriamonje, J. Andrzejewski, P. Assimakopoulo, L. Audouin, G. Badurek, P. Baumann, F. Becčvář, F. Belloni, E. Berthoumieux, F. Calviño, M. Calviani, D. Cano-Ott, R. Capote, C. Carrapiço, P. Cennini, V. Chepel, E. Chiaveri, N. Colonna, G. Corte, A. Couture, J. Cox, M. Dahlfor, S. David, I. Dillman, C. Domingo-Pardo, W. Dridi, I. Duran, C. Eleftheriadi, M. Embid-Segura, L. Ferrant, A. Ferrari, R. Ferreira-Marque, K. Fujii, W. Furman, I. Goncalve, E. Gonzalez-Romero, F. Gramegna, C. Guerrero, F. Gunsing, M. Heil, A. Herrera-Martinez, E. Jericha, F. Käppeler, Y. Kadi, D. Karadimo, D. Karamani, M. Kerveno, P. Koehler, E. Kossionide, M. Krtička, C. Lamboudi, H. Leeb, A. Lindote, I. Lope, M. Lozano, S. Lukic, J. Marganiec, S. Marrone, T. Martinez, C. Massimi, P. Mastinu, A. Mengoni, M. Mosconi, F. Neve, H. Oberhummer, S. O’Brien, J. Pancin, C. Papachristodoulou, C. Paradela, N. Patroni, A. Pavlik, P. Pavlopoulo, L. Perrot, R. Plag, A. Pluki, A. Poch, J. Praena, C. Pretel, J. Quesada, R. Reifarth, C. Rubbia, G. Rudolf, J. Salgado, C. Santo, L. Sarchiapone, I. Savvidi, C. Stephan, G. Tagliente, J. L. Tain, L. Tassan-Got, L. Tavora, R. Terlizzi, G. Vannini, P. Vaz, A. Ventura, D. Villamarin, M. C. Vincente, V. Vlachoudi, R. Vlastou, F. Vo, S. Walter, M. Wiescher, K. Wisshak, Ricardo Alarcon, Phil Cole, Andres J. Kreiner, and Hugo F. Arellano
Subjects: Nuclear reaction, Isotopes of uranium, Isotope, Chemistry, Fission, Nuclear Theory, Radiochemistry, Alpha particle, NEUTRON INDUCED REACTIONS, Neutron cross section, Nuclear physics, Neutron-induced fission reactions, N_TOF, Uranium-233, Physics::Accelerator Physics, Neutron, Spallation, Nuclear Experiment, TIME-OF-Flight
Abstract: Neutron induced fission cross sections of several isotopes have been measured at the CERN n_TOF spallation neutron facility. Between them some measurements involve isotopes (233U, 241Am, 243Am, 245Cm) relevant for applications to nuclear technologies. The n_TOF facility delivers neutrons with high instantaneous flux and in a wide energy range, from thermal up to 250 MeV. The experimental apparatus consists of an ionization chamber that discriminates fission fragments and α particles coming from natural radioactivity of the samples. All the measurements were performed referring to the standard cross section of 235U. European Commission Joint Research Centre European Community (EC) FIKW-CT-2000-00107
Published: 2010
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150. New measurement of the astrophysically important reaction 62Ni(n,gamma) at n-TOF

Author: Lederer, Claudia, Andriamonje, S., Andrzejewski, Józef, Calviño Tavares, Francisco|||0000-0002-7198-4639, Cortés Rossell, Guillem Pere|||0000-0002-3648-5826, 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], Neutrons, Física [Àrees temàtiques de la UPC], Cross section, Astrophysics::High Energy Astrophysical Phenomena, CERN, Nuclear physics, n_TOF, Física nuclear, Nuclear Experiment, Astrophysics, Neutrons Nuclear reaction, Nucleosynthesys
Abstract: The neutron capture cross section of the reaction 62Ni(n,gamma) 63Ni was measured over a wide energy range from 1 eV to 1 MeV at the neutron time-of-flight facility n_TOF installed at CERN. Preliminary results show that due to the unique experimental setup a high energy resolution was achieved and a number of resonances can be resolved also at high energies (tens to hundreds of keV). This measurement will allow a precise determination of the capture cross section and Maxwellian-Averaged Cross Sections (MACS) and be a step forward for understanding nucleosynthesis processes in stars
Published: 2010

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