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1. Characterization of the n-TOF EAR-2 neutron beam

Author

M. Sabaté-Gilarte, Enrique Casarejos, F. Gunsing, A. Musumarra, Cristian Massimi, A. Pavlik, P. Ferreira, C. Domingo-Pardo, P. M. Milazzo, N. Kivel, M. Krtička, R. Nolte, G. Tagliente, M. A. Cortés-Giraldo, Ariel Tarifeño-Saldivia, S. J. Lonsdale, P. C. Rout, M. Caamaño, F. Cerutti, Alfredo Ferrari, R. Cardella, T. Martinez, Javier Praena, S. Lo Meo, K. Göbel, C. Lederer, G. Vannini, S. Warren, A. Kimura, Tatsuya Katabuchi, E. Leal-Cidoncha, Tanja Heftrich, F. Mingrone, J. Andrzejewski, Mario Weigand, V. Variale, J. Marganiec, O. Aberle, T. Wright, E. Chiaveri, D. Cano-Ott, D. Macina, J. L. Tain, Carlo Rubbia, E. González, V. Vlachoudis, S. Barros, A. Gawlik, M. Kokkoris, J. I. Porras, Thomas Rauscher, Rene Reifarth, D. M. Castelluccio, A. Riego-Perez, J. Lerendegui-Marco, Stefan Schmidt, Mario Barbagallo, P. F. Mastinu, V. Khryachkov, M. Mirea, D. Schumann, P. Vaz, L. Cosentino, J. M. Quesada, C. Le Naour, L. Tassan-Got, Alberto Ventura, I. F. Gonçalves, M. Bacak, D. G. Jenkins, F. Käppeler, E. Mendoza, V. Bécares, F. Calviño, H. Leeb, A. Oprea, G. Cortes, A. Casanovas, J. Perkowski, S. Montesano, Y. H. Chen, J. Heyse, A. R. García, M. B. Gómez-Hornillos, B. Fernández-Domínguez, S. Heinitz, N. Patronis, Carlos Guerrero, M. Brugger, I. Duran, S. Valenta, Marco Calviani, A. Stamatopoulos, C. Beinrucker, A. Saxena, E. Jericha, C. Wolf, A. G. Smith, Roberto Losito, T. Glodariu, Paolo Finocchiaro, K. Rajeev, Philip Woods, Alberto Mengoni, J. A. Ryan, P. Schillebeeckx, Francesca Matteucci, V. Ketlerov, C. Weiss, R. Vlastou, A. Goverdovski, R. Dressler, A. Tsinganis, Damir Bosnar, Y. Kadi, P. Kavrigin, P. V. Sedyshev, F. Bečvář, Nicola Colonna, Hideo Harada, E. Dupont, J. Billowes, E. Griesmayer, M. Mastromarco, L. A. Damone, M. S. Robles, Anton Wallner, E. A. Maugeri, J. Balibrea, L. Audouin, M. Diakaki, E. Berthoumieux, V. Furman, Petar Žugec, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, n_TOF, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Universitat Politècnica de Catalunya. NEMEN - Nanoenginyeria de materials aplicats a l'energia, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Gobierno de España, 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), Chen, Y.H., Tassan-Got, L., Audouin, L., Le Naour, C., Durán, I., Casarejos, E., Aberle, O., Andrzejewski, J., Bécares, V., Bacak, M., Balibrea, J., Barbagallo, M., Barros, S., Bečvář, F., Beinrucker, C., Berthoumieux, E., Billowes, J., Bosnar, D., Brugger, M., Caamaño, M., Calviño, F., Calviani, M., Cano-Ott, D., Cardella, R., Casanovas, A., Castelluccio, D.M., Cerutti, F., Chiaveri, E., Colonna, N., Cortés, G., Cortés-Giraldo, M.A., Cosentino, L., Damone, L.A., Diakaki, M., Domingo-Pardo, C., Dressler, R., Dupont, E., Fernández-Domínguez, B., Ferrari, A., Ferreira, P., Finocchiaro, P., Furman, V., Göbel, K., Gómez-Hornillos, M.B., García, A.R., Gawlik, A., Glodariu, T., Gonçalves, I.F., González, E., Goverdovski, A., Griesmayer, E., Guerrero, C., Gunsing, F., Harada, H., Heftrich, T., Heinitz, S., Heyse, J., Jenkins, D.G., Jericha, E., Käppeler, F., Kadi, Y., Katabuchi, T., Kavrigin, P., Ketlerov, V., Khryachkov, V., Kimura, A., Kivel, N., Kokkoris, M., Krtička, M., Leal-Cidoncha, E., Lederer, C., Leeb, H., Lerendegui-Marco, J., Meo, S. Lo, Lonsdale, S.J., Losito, R., Macina, D., Marganiec, J., Martínez, T., Massimi, C., Mastinu, P., Mastromarco, M., Matteucci, F., Maugeri, E.A., Mendoza, E., Mengoni, A., Milazzo, P.M., Mingrone, F., Mirea, M., Montesano, S., Musumarra, A., Nolte, R., Oprea, A., Patronis, N., Pavlik, A., Perkowski, J., Porras, J.I., Praena, J., Quesada, J.M., Rajeev, K., Rauscher, T., Reifarth, R., Riego-Perez, A., Robles, M., Rout, P.C., Rubbia, C., Ryan, J.A., Sabaté-Gilarte, M., Saxena, A., Schillebeeckx, P., Schmidt, S., Schumann, D., Sedyshev, P., Smith, A.G., Stamatopoulos, A., Tagliente, G., Tain, J.L., Tarifeño-Saldivia, A., Tsinganis, A., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vlachoudis, V., Vlastou, R., Wallner, A., Warren, S., Weigand, M., Weiss, C., Wolf, C., Woods, P.J., Wright, T., Ugec, P., and Lo Meo, S.

Subjects
nTOF, QC1-999, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Neutron, 01 natural sciences, Nuclear physics, Physics and Astronomy (all), CERN, 0103 physical sciences, ddc:530, 010306 general physics, Neutrons, Physics, Flux, Large Hadron Collider, Física [Àrees temàtiques de la UPC], 010308 nuclear & particles physics, Beam, Neutron radiation, Accelerators and Storage Rings, Parallel plate, Characterization (materials science), Beam (structure)
Abstract

The experimental area 2 (EAR-2) at CERNs neutron time-of-flight facility (n TOF), which is operational since 2014, is designed and built as a short-distance complement to the experimental area 1 (EAR-1). The Parallel Plate Avalanche Counter (PPAC) monitor experiment was performed to characterize the beam profile and the shape of the neutron flux at EAR-2. The prompt γ-flash which is used for calibrating the time-of-flight at EAR-1 is not seen by PPAC at EAR-2, shedding light on the physical origin of this γ-flash., The USC group contribution has been partly supported by Spanish grant FPA2013-46236-P.

Published
2017
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2. Validation of Cross Sections with Criticality Experiment and Reaction Rates: the Neptunium Case

Author

C. Le Naour, Christoph A. Stephan, C. Paradela, L. Audouin, L.S. Leong, I. Duran, B. Berthier, L. Tassan-Got, and D. Tarrío

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Cross section (physics), Large Hadron Collider, Criticality, chemistry, Fission, Neptunium, Nuclear data, chemistry.chemical_element, Neutron, Neutron temperature
Abstract

The 237Np neutron-induced fission cross section has been recently measured in a large energy range (from eV to GeV) at the n_TOF facility at CERN. When compared to previous measurements the n_TOF fission cross section appears to be higher by 5–7% beyond the fission threshold. To check the relevance of the n_TOF data, we considered a criticality experiment performed at Los Alamos with a 6 kg sphere of 237Np, surrounded by uranium highly enriched in 235U so as to approach criticality with fast neutrons. The multiplication factor keff of the calculation is in better agreement with the experiment when we replace the ENDF/B-VII.0 evaluation of the 237Np fission cross section by the n_TOF data. We also explored the hypothesis of deficiencies of the inelastic cross section in 235U which has been invoked by some authors to explain the deviation of 750 pcm. The large modification needed to reduce the deviation seems to be incompatible with existing inelastic cross section measurements. Also we show that the ν ¯ of 237Np can hardly be incriminated because of the high accuracy of the existing data. Fission rate ratios or averaged fission cross sections measured in several fast neutron fields seem to give contradictory results on the validation of the 237Np cross section but at least one of the benchmark experiments, where the active deposits have been well calibrated for the number of atoms, favors the n_TOF data set. These outcomes support the hypothesis of a higher fission cross section of 237Np.

Published
2014

3. Measurement of the angular distribution of fission fragments using a PPAC assembly at CERN n_TOF

Author

F. Mingrone, M. J. Vermeulen, J. Andrzejewski, P. E. Koehler, C. Langer, F. Gunsing, Petar Žugec, Carlos Guerrero, Damir Bosnar, C. Le Naour, Y. Kadi, S. Valenta, Marco Calviani, I. F. Gonçalves, F. Käppeler, T. Ware, J. Mottier, D. G. Jenkins, M. B. Gómez-Hornillos, M. P. W. Chin, J. Billowes, F. Cerutti, Cristian Massimi, V. Bécares, C. Paradela, E. Griesmayer, A. Pavlik, Fabio Belloni, L. Audouin, Srinivasan Ganesan, P. Gurusamy, F. Roman, Rene Reifarth, Stefan Schmidt, G. Vannini, C. Domingo-Pardo, G. Giubrone, M. A. Cortés-Giraldo, Vittorio Boccone, J. M. Quesada, M. Meaze, W. Mondalaers, Mario Barbagallo, M. Caamaño, L. Tassan-Got, D. Cano-Ott, M. Diakaki, A. Tsinganis, I. Duran, A. R. García, Ch.O. Bacri, A. Manousos, Nicola Colonna, L.S. Leong, R. Vlastou, P. F. Mastinu, Vasilis Vlachoudis, M. Brugger, J. Marganiec, Mario Weigand, G. Cortes, E. Berthoumieux, A. Ventura, D. Tarrío, V. Petitbon, Alberto Mengoni, P. M. Milazzo, Arnaud Ferrari, S. Altstadt, G. Tagliente, C. Eleftheriadis, Roberto Losito, F. Bečvář, E. Chiaveri, M. Mirea, Thomas Rauscher, E. Jericha, E. Mendoza, C. Rubbia, C. Weiß, D. Karadimos, M. Kokkoris, T. J. Wright, Peter Schillebeeckx, N. Dzysiuk, C. Lederer, E. González-Romero, P. Vaz, H. Leeb, Javier Praena, M. Mastromarco, J. Perkowski, K. Fraval, C. Carrapiço, Anton Wallner, M. Krtička, F. Calviño, V. Variale, J. L. Tain, Roberto Versaci, T. Martinez, A. Riego, A. J. M. Plompen, Jeri Kroll, R. Sarmento, D. Tarrio, L. S. Leong, L. Audouin, I. Duran, C. Paradela, L. Tassan-Got, C. L. Naour, C. O. Bacri, V. Petitbon, J. Mottier, M. Caamano, S. Altstadt, J. Andrzejewski, 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, E. Chiaveri, M. Chin, N. Colonna, G. Corte, M. A. Cortes-Giraldo, M. Diakaki, C. Domingo-Pardo, 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, G. Jenkin, E. Jericha, Y. Kadi, F. Kaeppeler, D. Karadimo, P. Koehler, M. Kokkori, M. Krticka, J. Kroll, C. Langer, C. Lederer, H. Leeb, 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, 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, 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, P. Zugec, 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, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Universitat Politècnica de Catalunya. NERG - Grup de Recerca d'Enginyeria Nuclear, and Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear

Subjects
Nuclear and High Energy Physics, Fission, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Neutron, Anisotropy, Angular distribution, 232Th, Gas detectors, Subatomär fysik, Nuclear physics, Energia nuclea, Subatomic Physics, Detectors and Experimental Techniques, Th-232, Nuclear Experiment, Instrumentation, Physics, Energies::Energia nuclear [Àrees temàtiques de la UPC], Large Hadron Collider, Detector, Nuclear energy, Actinide, Neutron radiation, NEUTRON INDUCED FISSION, Nuclear fission, Física nuclear, ANGULAR DISTRIBUTIONS, TIME OF FLIGHT
Abstract

A fission reaction chamber based on Parallel Plate Avalanche Counters (PPACs) was built for measuring angular distributions of fragments emitted in neutron-induced fission of actinides at the neutron beam available at the Neutron Time-Of-Flight (n_TOF) facility at CERN. The detectors and the samples were tilted 45 degrees with respect to the neutron beam direction to cover all the possible values of the emission angle of the fission fragments. The main features of this setup are discussed and results on the fission fragment angular distribution are provided for the Th-232(n,f) reaction around the fission threshold. The results are compared with the available data in the literature, demonstrating the good capabilities of this setup. (C) 2014 Elsevier B.V. All rights reserved. A fission reaction chamber based on Parallel Plate Avalanche Counters (PPACs) was built for measuring angular distributions of fragments emitted in neutron-induced fission of actinides at the neutron beam available at the Neutron Time-Of-Flight (n-TOF) facility at CERN. The detectors and the samples were tilted 45 with respect to the neutron beam direction to cover all the possible values of the emission angle of the fission fragments. The main features of this setup are discussed and results on the fission fragment angular distribution are provided for the 232Th(n,f) reaction around the fission threshold. The results are compared with the available data in the literature, demonstrating the good capabilities of this setup. © 2014 Elsevier B.V.

Published
2014
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4. Criticality experiments for validation of cross sections: The neptunium case

Author

C. Le Naour, D. Tarrío, B. Berthier, J.N. Wilson, L. Tassan-Got, L.S. Leong, C. Paradela, L. Audouin, I. Duran, and Christoph A. Stephan

Subjects
Nuclear reaction, Physics, Nuclear physics, Cross section (physics), Nuclear Energy and Engineering, Criticality, Fission, Hadron, Neutron, Nucleon, Neutron temperature
Abstract

The 237 Np neutron-induced fission cross section has been measured recently in a large energy range (from eV to GeV) at the n_TOF facility at CERN. When compared to previous measurement the n_TOF fission cross section appears to be higher by 5–7% beyond the fission threshold. To check the relevance of n_TOF data, we simulate a criticality experiment performed at Los Alamos with a 6 kg sphere of 237 Np. This sphere was surrounded by enriched uranium 235 U so as to approach criticality with fast neutrons. The simulation predicts a multiplication factor k eff in better agreement with the experiment (the deviation of 750 pcm is reduced to 250 pcm) when we replace the ENDF/B-VII.0 evaluation of the 237 Np fission cross section by the n_TOF data. We also explore the hypothesis of deficiencies of the inelastic cross section in 235 U which has been invoked by some authors to explain the deviation of 750 pcm. The large distortion that should be applied to the inelastic cross sections in order to reconcile the critical experiment with its simulation is incompatible with existing measurements. Also we show that the ν ¯ of 237 Np can hardly be incriminated because of the high accuracy of the existing data. Fission rate ratios or averaged fission cross sections measured in several fast neutron fields seem to give contradictory results on the validation of the 237 Np cross section but at least one of the benchmark experiments, where the active deposits have been well calibrated for the number of atoms, favors the n_TOF data set. These outcomes support the hypothesis of a higher fission cross section of 237 Np.

Published
2013

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

Author

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

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

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

Published
2016

6. 237Np(n,f) Cross Section: New Data and Present Status

Author

B. Haas, I. Savvidis, C. Lampoudis, A. Pavlik, C. Domingo-Pardo, G. Cortes, Martin Heil, P. Cennini, S. David, D. Tarrío, D. Cano-Ott, W. Dridi, Roberto Capote, P.A. Assimakopoulos, M. Mosconi, S. O'Brien, G. Tagliente, Marco Calviani, M. Oshima, R. Terlizzi, Corrie S. Moreau, S. Walter, J. Andrzejewski, L. Tavora, Ralf Plag, F. Calviño, H. Leeb, J. Salgado, Isabel Lopes, P. Rullhusen, J. Marganiec, S. Andriamonje, A. Poch, C. Santos, E. Kossionides, E. Chiaveri, K. Wisshak, P. F. Mastinu, A. J. M. Plompen, Christoph A. Stephan, J. Pancin, A. Herrera-Martinez, N. Patronis, A. Ventura, F. Gunsing, D. Trubert, L. Ferrant, Cristian Massimi, Javier Praena, I. Duran, Arnaud Ferrari, G. Aerts, M. Dahlfors, Y. Kadi, R. C. Haight, M. Embid-Segura, P. Vaz, Rene Reifarth, H. Álvarez, S. Lukic, D. Villamarin, Alberto Mengoni, James L. Cox, C. Paradela, M. C. Vicente, C. Eleftheriadis, Thomas Rauscher, Aaron Couture, M. Krtička, S. Isaev, J. M. Quesada, Manuel Lozano, L. Tassan-Got, Carlos Guerrero, U. Abbondanno, J. L. Tain, L. Audouin, B. Berthier, P. E. Koehler, L. Sarchiapone, D. Karadimos, R. Ferreira-Marques, T. Martinez, Heinz Oberhummer, E. Jericha, C. Le Naour, E. González-Romero, P. Pavlopoulos, Michael Wiescher, F. Voss, F. Becvar, W.I. Furman, F. Alvarez-Velarde, R. Vlastou, Marco T. Pigni, Nicola Colonna, Masayuki Igashira, E. Berthoumieux, Gerald Badurek, A. Plukis, Vasilis Vlachoudis, C. A. Papachristodoulou, F. Gramegna, K. Fujii, C. T. Papadopoulos, A. Lindote, C. Rubbia, C. Pretel, F. Käppeler, Isabel S. Gonçalves, S. Marrone, M. Kerveno, F. Neves, P. M. Milazzo, L. Perrot, V. Chepel, G. Rudolf, P. Baumann, G. Vannini, C. Carrapiço, D. Karamanis, I. Dillmann, 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, Paradela C., Tassan-Got L., Audouin L., Berthier B., Ferrant L., Isaev S., Naour C. Le, Stephan C., Trubert D., David S., Duran I., Tarrio D., Alvarez H., Abbondanno U., Fujii K., Milazzo P. M., Moreau C., Aerts G., Alvarez-Velarde F., Cano-Ott D., Embid-Segura M., Gonzalez-Romero E., Guerrero C., Martinez T., Villamarin D., Vicente M. C., Andriamonje S., Berthoumieux E., Dridi W., Gunsing F., Pancin J., Perrot L., Plukis A., Andrzejewski J., Marganiec J., Assimakopoulos P., Karadimos D., Karamanis D., Papachristodoulou C., Patronis N., 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., Cortes G., Poch A., Pretel C., Calviani M., Gramegna F., Mastinu P., Praena J., Capote R., Carrapico C., Cennini P., Chiaveri E., Dahlfors M., Ferrari A., Herrera-Martinez A., Kadi Y., Sarchiapone L., Vlachoudis V., Chepel V., Ferreira-Marques R., Lindote A., Lopes I., Neves F., Colonna N., Tagliente G., Terlizzi R., Couture A., Cox J., Marrone S., Obrien S., Wiescher M., Dillmann I., Heil M., Kappeler F., Mosconi M., Voss F., Walter S., Wisshak K., Domingo-Pardo C., Plag R., Plompen A., Tain J. L., Eleftheriadis C., Savvidis I., Furman W., Goncalves I., Salgado J., Santos C., Tavora L., Vaz P., 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., Pavlik A., Pavlopoulos P., Vlastou R., Rauscher T., Rubbia C., Rullhusen P., Ventura 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, 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), 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), 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 Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Energies::Energia nuclear [Àrees temàtiques de la UPC], Physics, neutron fission cross section, Np-237, Fission, Nuclear data, General Physics and Astronomy, Nuclear energy, 020206 networking & telecommunications, Energies::Energia nuclear::Reactors nuclears de fissió [Àrees temàtiques de la UPC], 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear physics, TIME-OF-FLIGHT, Cross section (physics), Fusion reactors, Reactors nuclears, n TOF experiment, 0202 electrical engineering, electronic engineering, information engineering, Energia nuclear, 020201 artificial intelligence & image processing, Energy (signal processing), Neutron-induced ssion reactions
Abstract

In this document, we present the nal result obtained at the n TOF experiment for the neutron- induced ssion cross section of the 237Np, from the ssion threshold up to 1 GeV. The method applied to get this result is brie y discussed. n TOF data are compared to the last experimental measurements using other TOF facilities or the surrogate method, reported experiments performed with monoenergetic sources and the FISCAL systematic, including a discussion about the existing discrepancies.

Published
2011

7. High-energy Neutron-induced Fission Cross Sections of Natural Lead and Bismuth-209

Author

D. Tarrio, L. Tassan-Got, L. Audouin, B. Berthier, L. Ferrant, S. Isaev, C. Le Naour, C. Stephan, D. Trubert, S. David, I. Duran, C. Paradela, H. Alvarez, U. Abbondanno, K. Fujii, P. M. Milazzo, C. Moreau, G. Aerts, F. Alvarez-Velarde, D. Cano-Ott, M. Embid-Segura, E. Gonzalez-Romero, C. Guerrero, T. Martinez, D. Villamarin, M. C. Vicente, S. Andriamonje, E. Berthoumieux, W. Dridi, F. Gunsig, J. Pancin, L. Perrot, A. Plukis, J. Andrzejewski, J. Marganiec, P. Assimakopoulos, D. Karadimos, D. Karamanis, C. Papachristodoulou, N. Patronis, G. Badurek, E. Jericha, H. Leeb, H. Oberhummer, M. T. Pigni, P. Baumann, M. Kerveno, S. Lukic, G. Rudolf, F. Becvar, M. Krticka, F. Calvino, G. Cortes, A. Poch, C. Pretel, M. Calviani, F. Gramegna, P. Mastinu, J. Praena, R. Capote, C. Carrapico, P. Cennini, E. Chiaveri, M. Dahlfors, A. Ferrari, I. Goncalves, A. Herrera-Martinez, Y. Kadi, L. Sarchiapone, V. Vlachoudis, V. Chepel, R. Ferreira-Marques, A. Lindote, I. Lopes, F. Neves, N. Colonna, G. Tagliente, R. Terlizzi, A. Couture, J. Cox, S. Marrone, S. O'brien, M. Wiescher, I. Dillmann, M. Heil, F. Kappeler, M. Mosconi, F. Voss, S. Walter, K. Wisshak, C. Domingo-Pardo, R. Plag, A. Plompen, J. L. Tain, C. Eleftheriadis, I. Savvidis, W. Furman, B. Haas, R. Haight, R. Reifarth, M. Igashira, P. Koehler, E. Kossionides, C. Lampoudis, M. Lozano, J. Quesada, C. Massimi, G. Vannini, A. Mengoni, M. Oshima, C. Papadopoulos, A. Pavlik, P. Pavlopoulos, R. Vlastou, T. Rauscher, C. Rubbia, P. Rullhusen, J. Salgado, C. Santos, L. Tavora, P. Vaz, A. Ventura, 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, 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), 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), 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 Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Tarrno D., Tassan-Got L., Audouin L., Berthier B., Ferrant L., Isaev S., Naour C. Le, Stephan C., Trubert D., David S., Duran I., Paradela C., Alvarez H., Abbondanno U., Fujii K., Milazzo P. M., Moreau C., Aerts G., Alvarez-Velarde F., Cano-Ott D., Embid-Segura M., Gonzalez-Romero E., Guerrero C., Martinez T., Villamarin D., Vicente M. C., Andriamonje S., Berthoumieux E., Dridi W., Gunsig F., Pancin J., Perrot L., Plukis A., Andrzejewski J., Marganiec J., Assimakopoulos P., Karadimos D., Karamanis D., Papachristodoulou C., Patronis N., 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., Cortes G., Poch A., Pretel C., Calviani M., Gramegna F., Mastinu P., Praena J., Capote R., Carrapico C., Cennini P., Chiaveri E., Dahlfors M., Ferrari A., Goncalves I., Herrera-Martinez A., Kadi Y., Sarchiapone L., Vlachoudis V., Chepel V., Ferreira-Marques R., Lindote A., Lopes I., Neves F., Colonna N., Tagliente G., Terlizzi R., Couture A., Cox J., Marrone S., Obrien S., Wiescher M., Dillmann I., Heil M., Kappeler F., Mosconi M., Voss F., Walter S., Wisshak K., Domingo-Pardo C., Plag R., Plompen A., Tain J. L., Eleftheriadis C., Savvidis I., Furman W., 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., Pavlik A., Pavlopoulos P., Vlastou R., Rauscher T., Rubbia C., Rullhusen P., Salgado J., Santos C., Tavora L., Vaz P., and Ventura A.

Subjects
Pb-nat(n, Fission, Nuclear data, Nuclear Theory, General Physics and Astronomy, chemistry.chemical_element, f), Energies::Energia nuclear::Reactors nuclears de fissió [Àrees temàtiques de la UPC], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Bismuth, Nuclear physics, Nuclear reactors, Reactors nuclears, Neutron, Spallation, Nuclear Experiment, EMERGING NUCLEAR TECHNOLOGIES, Neutron-induced ssion reactions, Energies::Energia nuclear [Àrees temàtiques de la UPC], Physics, Cluster decay, Nuclear energy, Bi-209(n, n TOF facility, TIME-OF-FLIGHT, chemistry, Spallation neutron source, Energia nuclear, Neutron source, PPAC fission detector, Spallation Neutron Source
Abstract

The CERN Neutron Time-Of-Flight (n-TOF) facility is well suited to measure small neutron-induced fission cross sections, as those of subactinides. The cross section ratios of {sup nat}Pb and {sup 209}Bi relative to {sup 235}U and {sup 238}U were measured using PPAC detectors. The fragment coincidence method allows to unambiguously identify the fission events. The present experiment provides the first results for neutron-induced fission up to 1 GeV for {sup nat}Pb and {sup 209}Bi. A good agreement with previous experimental data below 200 MeV is shown. The comparison with proton-induced fission indicates that the limiting regime where neutron-induced and proton-induced fission reach equal cross section is close to 1 GeV.

Published
2011

8. High accuracy U-235(n,f) data in the resonance energy region

Author

Carlos Guerrero, U. Abbondanno, I. Dillmann, I. Savvidis, M. Kerveno, C. Lederer, H. Leeb, A. Pavlik, L. Ferrant, F. Gramegna, D. Villamarin, Ralf Plag, I. Duran, A. Goverdovski, F. Gunsing, Christoph A. Stephan, F. Alvarez-Velarde, P. Pavlopoulos, C. Le Naour, M. Embid-Segura, S. David, A. Ventura, Cristian Massimi, P. Rullhusen, Gerald Badurek, Marco Calviani, F. Voss, P. M. Milazzo, G. Tagliente, A. Plukis, S. Lukic, A. Couture, G. Cortes, W.I. Furman, C. Rubbia, S. Isaev, C. Eleftheriadis, R. C. Haight, S. Marrone, K. Fujii, C. Paradela, P. Baumann, L. Perrot, K. Wisshak, J. Salgado, Thomas Rauscher, P. Cennini, A. Poch, Roberto Capote, L. Audouin, M. Krtička, F. Calviño, I. F. Gonçalves, D. Karadimos, R. Vlastou, E. Berthoumieux, V. Chepel, W. Dridi, C. Santos, M.C. Vincente, L. Tavora, M. Mosconi, L. Sarchiapone, E. González-Romero, E. Jericha, G. Aerts, R. Ferreira-Marques, T. Martinez, Rene Reifarth, S. Walter, J. L. Tain, P. E. Koehler, F. Becvar, A. Lindote, Diego Tarrio, J. M. Quesada, L. Tassan-Got, J. Marganiec, Nicola Colonna, S. Andriamonje, C. Carrapiço, R. Terlizzi, C. Weiss, V. Ketlerov, Vasilis Vlachoudis, H. Alvarez-Pol, E. Chiaveri, Javier Praena, P. F. Mastinu, Y. Kadi, C. Pretel, G. Rudolf, B. Berthier, Michael Heil, A. J. M. Plompen, Corrie S. Moreau, C. Lampoudis, C. Domingo-Pardo, M. Dahlfors, M. Wiesher, P. Vaz, D. Cano-Ott, Arnaud Ferrari, Alberto Mengoni, J. Andrzejewski, V. Konovalov, J. Cox, Masayuki Igashira, F. Kaeppeler, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Serot, O., Paradela, C., Duran, I., Tassan-Got, L., Audouin, L., Berthier, B., Isaev, S., Le Naour, C., Stephan, C., Tarrío, D., Abbondanno, U., Aerts, G., Álvarez-Pol, H., Álvarez-Velarde, F., Andriamonje, S., Andrzejewski, J., Badurek, G., Baumann, P., Becvar, F., Berthoumieux, E., Calviño, F., Calviani, M., Cano-Ott, D., Capote, R., Carrapiço, C., Cennini, P., Chepel, V., Chiaveri, E., Colonna, N., Cortes, G., Couture, A., Cox, J., Dahlfors, M., David, S., Dillmann, I., Domingo-Pardo, C., Dridi, W., Eleftheriadis, C., Embid-Segura, M., Ferrant, L., Ferrari, A., Ferreira-Marques, R., Fujii, K., Furman, W., Gonçalves, I.F., Gonzalez-Romero, E., Goverdovski, A., Gramegna, F., Guerrero, C., Gunsing, F., Haight, R., Heil, M., Igashira, M., Jericha, E., Kadi, Y., Kaeppeler, F., Karadimos, D., Kerveno, M., Ketlerov, V., Koehler, P., Konovalov, V., Krticka, M., Lampoudis, C., Lederer, C., Leeb, H., Lindote, A., Lukic, S., Marganiec, J., Martinez, T., Marrone, S., Massimi, C., Mastinu, P., Mengoni, A., Milazzo, P.M., Moreau, C., Mosconi, M., Pancin, S, Pavlik, A., Pavlopoulos, P., Perrot, L., Plag, R., Plompen, A., Plukis, A., Poch, A., Pretel, C., Praena, J., Quesada, J., Rauscher, T., Reifarth, R., Rubbia, C., Rudolf, G., Rullhusen, P., Salgado, J., Santos, C., Sarchiapone, L., Savvidis, I., Tagliente, G., Tain, J.L., Tavora, L., Terlizzi, R., Vaz, P., Ventura, A., Villamarin, D., Vincente, M.C., Vlachoudis, V., Vlastou, R., Voss, F., Walter, S., Weiss, C., Wiesher, M., and Wisshak, K.

Subjects
Nuclear reaction, Fission, nTOF, QC1-999, Neutron, 01 natural sciences, Resonance (particle physics), Nuclear physics, Subatomär fysik, Cross section (physics), U235, Ionization, 0103 physical sciences, Subatomic Physics, CERN, ddc:530, 010306 general physics, Physics, Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, Range (particle radiation), Large Hadron Collider, Física [Àrees temàtiques de la UPC], Reaccions nuclears, Cross section, 010308 nuclear & particles physics, Nuclear fission, nuclear technologies, Engineering physics, Física nuclear, Nuclear reactions
Abstract

The $^{235}$U neutron-induced cross section is widely used as reference cross section for measuring other fission cross sections, but in the resonance region it is not considered as an IAEA standard because of the scarce experimental data covering the full region. In this work, we deal with a new analysis of the experimental data obtained with a detection setup based on parallel plate ionization chambers (PPACs) at the CERN n_TOF facility in the range from 1 eV to 10 keV. The relative cross section has been normalised to the IAEA value in the region between 7.8 and 11 eV, which is claimed as well-known. Comparison with the ENDF/B-VII evaluation and the IAEA reference file from 100 eV to 10 keV are provided.

Published
2015

9. Results from the TARC experiment: spallation neutron phenomenology in lead and neutron-driven nuclear transmutation by adiabatic resonance crossing

Author

F. Casagrande, V. Vlachoudis, P. Kokkas, S. Andriamonje, E. Savvidis, J. Bueno, M. Perlado, Pantelis Karaiskos, Konstantin Zioutas, M. Embid, P. Cennini, C. Geles, E. González, D. Trubert, E. Perez-Enciso, A. Angelopoulos, S. Buono, George Kitis, P. Pavlopoulos, J. Aleixandre, I. Papadopoulos, J.M. Loiseaux, C. Sirvent, V. Lacoste, J.B. Viano, J. I. Collar, J. Galvez, J. Tamarit, F. Schussler, J. Oropesa, J. P. Revol, J. A. Rubio, A. Pérez-Navarro, E. Belle, M. Poza, C. Eleftheriadis, J. Garcia, A. Apostolakis, M. Hussonnois, A. Placci, D. Heuer, Loukas Sakelliou, C. López, O. Méplan, A. Giorni, S. Dı́ez, H. Nifenecker, C. A. Bompas, F. Saldana, C. Rubbia, C. Le Naour, Alberto Abánades, H. Arnould, R. Del Moral, I. Goulas, S. Vieira, R. Klapisch, José M. Martínez-Val, E. Cerro, A. Tzima, L. Dumps, Y. Kadi, R. Fernandez, D. Brozzi, O. González, Federico Carminati, 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and TARC

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Proton, Nuclear transmutation, 010308 nuclear & particles physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Particle detector, Energy amplifier, Nuclear physics, Neutron capture, 13. Climate action, 0103 physical sciences, Spallation, Neutron, Nuclear Experiment, 010306 general physics, Instrumentation, Nuclear Physics
Abstract

We summarize here the results of the TARC experiment whose main purpose is to demonstrate the possibility of using Adiabatic Resonance Crossing (ARC) to destroy efficiently Long-Lived Fission Fragments (LLFFs) in accelerator-driven systems and to validate a new simulation developed in the framework of the Energy Amplifier programme. An experimental set-up was installed in a CERN PS proton beam line to study how neutrons produced by spallation at relatively high energy ( E n ⩾1 MeV ) slow down quasi-adiabatically with almost flat isolethargic energy distribution and reach the capture resonance energy of an element to be transmuted where they will have a high probability of being captured. Precision measurements of energy and space distributions of spallation neutrons (using 2.5 and 3.5 GeV/c protons) slowing down in a 3.3 m×3.3 m×3 m lead volume and of neutron capture rates on LLFFs 99Tc, 129I, and several other elements were performed. An appropriate formalism and appropriate computational tools necessary for the analysis and understanding of the data were developed and validated in detail. Our direct experimental observation of ARC demonstrates the possibility to destroy, in a parasitic mode, outside the Energy Amplifier core, large amounts of 99Tc or 129I at a rate exceeding the production rate, thereby making it practical to reduce correspondingly the existing stockpile of LLFFs. In addition, TARC opens up new possibilities for radioactive isotope production as an alternative to nuclear reactors, in particular for medical applications, as well as new possibilities for neutron research and industrial applications.

Published
2002

10. Study of 234U(n,f) resonances measured at the CERN n TOF facility

Author

B. Berthier, E. Kossionides, Javier Praena, V. Chepel, B. Haas, J. Marganiec, P. Cennini, S. Andriamonje, G. Vannini, C. Lampoudis, S. David, G. Tagliente, S. Lukic, E. Chiaveri, Corrie S. Moreau, W. Dridi, S. Walter, P. Baumann, A. Pavlik, Ralf Plag, P. F. Mastinu, P. E. Koehler, M. Mosconi, M. Kerveno, A. Ventura, C. Domingo-Pardo, L. Sarchiapone, R. Vlastou, C. Pretel, A. J. M. Plompen, J. Salgado, C. Stephan, S. O'Brien, Rene Reifarth, M. Embid-Segura, G. Aerts, E. Berthoumieux, F. Voss, A. Poch, P. Pavlopoulos, J. M. Quesada, L. Tassan-Got, G. Cortes, G. Rudolf, I. Lopes, I. Dillmann, D. Tarrío, Manuel Lozano, Matthias Heil, M. Oshima, Nicola Colonna, R. Terlizzi, L.S. Leong, Carlos Guerrero, M. C. Vincente, James L. Cox, Marco T. Pigni, Vasilis Vlachoudis, I. Duran, J. Andrzejewski, A. Herrera-Martinez, L. Tavora, Heinz Oberhummer, F. Gramegna, Arnaud Ferrari, Roberto Capote, Masayuki Igashira, D. Cano-Ott, Y. Kadi, A. Plukis, L. Perrot, F. Käppeler, E. Leal-Cidoncha, C. Eleftheriadis, P. Rullhusen, L. Ferrant, W.I. Furman, C. Carrapiço, S. Isaev, Thomas Rauscher, K. Fujii, R. C. Haight, F. Alvarez-Velarde, Marco Calviani, U. Abbondanno, M. Krtička, F. Calviño, Alberto Mengoni, D. Karadimos, M. Dahlfors, C. Paradela, K. Wisshak, R. Ferreira-Marques, T. Martinez, P. Vaz, I. Savvidis, Gerald Badurek, E. González-Romero, L. Audouin, H. Álvarez, Aaron Couture, J. L. Tain, Michael Wiescher, J. Pancin, C. T. Papadopoulos, D. Villamarin, C. Rubbia, Isabel S. Gonçalves, S. Marrone, A. Lindote, H. Leeb, E. Jericha, F. Gunsing, D. Trubert, Cristian Massimi, F. Neves, P. M. Milazzo, C. Santos, F. Bečvář, C. Le Naour, 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, Fission, Large Hadron Collider, Cross section, TOF, Resonance, Nuclear data, Neutron, Nuclear physics, Cross section (physics), Neutron cross section, Nuclear Reactions
Abstract

We present the analysis of the resolved resonance region for the 234U(n,f) cross section data measured at the CERN n TOF facility. The resonance parameters in the energy range from 1 eV to 1500 eV have been obtained with the SAMMY code by using as initial parameters for the fit the resonance parameters of the JENDL-3.3 evaluation. In addition, the statistical analysis has been accomplished, partly with the SAMDIST code, in order to study the level spacing and the Mehta-Dyson correlation.

Published
2014

11. New measurement of exotic decay of 225Ac by 14C emission

Author

A. Guglielmetti, M. Hussonnois, A.L. Pasinetti, V. Barci, H.L. Ravn, J. F. Le Du, G. Ardisson, C. Le Naour, R. Bonetti, D. Trubert, V. L. Mikheev, T. Giles, S. P. Tretyakova, Institut de Physique Nucléaire d'Orsay (IPNO), 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, Nuclear and High Energy Physics, Decay scheme, Isotope, 010308 nuclear & particles physics, Branching fraction, Radioactive source, Hadron, Half-life, Astrophysics::Cosmology and Extragalactic Astrophysics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, 0103 physical sciences, Nuclear fusion, Nuclear Physics - Experiment, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, 010306 general physics, Radioactive decay
Abstract

The branching ratio of $^{225}$Ac decay by emission of $^{14}$C was remeasured under improved experimental conditions by using a radioactive source produced at the ISOLDE mass-separator at CERN and a nuclear track detector technique. The result, B=$\lambda_{^{14}\textrm{C}} / \lambda_{\alpha} = (4.5 \pm 1.4) 10^{-12}$, is consistent with the anomalously high value obtained in the 1993 experiment thus confirming the importance of nuclear structure effects in this exotic decay.

Published
2001

12. The solar neutrino problem: Low energy measurements of the 7Be(p,γ)8B cross section

Author

Vincent Tatischeff, F. Hammache, M. Jacotin, J. P. Thibaud, P. Aguer, S. Ouichaoui, S. Barhoumi, J. Kiener, C. Le Naour, G. Claverie, J.F. Chemin, L. Brillard, M. Hussonnois, J. N. Scheurer, G. Bogaert, A. Coc, A. Lefebvre, C. Angulo, and E. Virassamynaiken

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Cross section (physics), Low energy, Solar neutrino problem
Published
2001

13. Experimental verification of neutron phenomenology in lead and of transmutation by adiabatic resonance crossing in accelerator driven systems

Author

O. Méplan, R. Fernandez, L. Dumps, Alberto Abánades, H. Arnould, R. Del Moral, V. Vlachoudis, I. Goulas, E. González, F. Casagrande, George Kitis, C. A. Bompas, C. Le Naour, C. Sirvent, S. Vieira, D. Heuer, E. Cerro, H. Nifenecker, F. Saldana, P. Pavlopoulos, J. Bueno, J. P. Revol, Federico Carminati, J. Aleixandre, R. Klapisch, E. Savvidis, J.M. Loiseaux, José M. Martínez-Val, M. Perlado, S. Andriamonje, I. Papadopoulos, V. Lacoste, Konstantin Zioutas, J. Garcia, A. Giorni, D. Brozzi, M. Embid, S. Dı́ez, J. Galvez, Pantelis Karaiskos, A. Apostolakis, O. González, P. Cennini, A. Placci, M. Hussonnois, Y. Kadi, S. Buono, A. Angelopoulos, A. Tzima, Loukas Sakelliou, C. López, J. Tamarit, D. Trubert, E. Perez-Enciso, J.B. Viano, C. Geles, A. Pérez-Navarro, J. Oropesa, C. Rubbia, E. Belle, M. Poza, J. A. Rubio, J. I. Collar, P. Kokkas, F. Schussler, and C. Eleftheriadis

Subjects
Physics, Nuclear and High Energy Physics, Neutron transport, Nuclear transmutation, 010308 nuclear & particles physics, 7. Clean energy, 01 natural sciences, Neutron temperature, Energy amplifier, Nuclear physics, Neutron capture, 0103 physical sciences, Physics::Accelerator Physics, Spallation, Neutron, Nuclear Experiment, 010306 general physics, Adiabatic process, Instrumentation
Abstract

The Transmutation by Adiabatic Resonance Crossing (TARC) experiment was carried out as PS211 at the CERN PS from 1996 to 1999. Energy and space distributions of spallation neutrons (produced by 2.5 and 3.57 GeV/c CERN proton beams) slowing down in a 3.3×3.3×3 m3 lead volume and neutron capture rates on long-lived fission fragments 99Tc and 129I demonstrate that Adiabatic Resonance Crossing (ARC) can be used to eliminate efficiently such nuclear waste and validate innovative simulation.

Published
2001

14. Low-Energy Measurement of theB7e(p,γ)B8Cross Section

Author

L. Brillard, G. Bogaert, M. Jacotin, J. P. Thibaud, C. Le Naour, J. N. Scheurer, A. Coc, Carmen Angulo, V. Tatischeff, M. Hussonnois, A. Lefebvre, F. Hammache, S. Ouichaoui, J.F. Chemin, E. Virassamynaiken, G. Claverie, J. Kiener, P. Aguer, and S. Barhoumi

Subjects
Physics, Spectrometer, 010308 nuclear & particles physics, S-factor, General Physics and Astronomy, Zero-point energy, Alpha particle, 01 natural sciences, Coincidence, Spectral line, Cross section (physics), Low energy, 0103 physical sciences, Atomic physics, 010306 general physics
Abstract

We have measured the cross section of the 7Be(p,gamma)8B reaction for E_cm = 185.8 keV, 134.7 keV and 111.7 keV using a radioactive 7Be target (132 mCi). Single and coincidence spectra of beta^+ and alpha particles from 8B and 8Be^* decay, respectively, were measured using a large acceptance spectrometer. The zero energy S factor inferred from these data is 18.5 +/- 2.4 eV b and a weighted mean value of 18.8 +/- 1.7 eV b (theoretical uncertainty included) is deduced when combining this value with our previous results at higher energies. Comment: Accepted for publication in Phys. Rev. Lett

Published
2001

15. Cluster decay of 230U via Ne emission

Author

R. Bonetti, C. Le Naour, C. Carbonini, D. Trubert, M. Hussonnois, and A. Guglielmetti

Subjects
Physics, Nuclear and High Energy Physics, Neon, Cluster decay, chemistry, Branching fraction, Cluster (physics), chemistry.chemical_element, Atomic physics, Track detectors
Abstract

By using glass track detectors in 4π geometry we measured the branching ratio of 230 U for emission of Ne clusters to be B=(4.8±2.0)×10 −14 and an upper limit for 18 O emission from 226 Th to be B −14 . On the basis of theoretical calculations, the most probable neon cluster comes out to be 22 Ne.

Published
2001

16. Octupole deformation in226Th

Author

Raymond K. Sheline, C. Le Naour, M. Vergnes, C. F. Liang, D. Trubert, and P. Paris

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Quantum electrodynamics, 0103 physical sciences, Transition dipole moment, Deformation (meteorology), 010306 general physics, 01 natural sciences
Published
1998

17. 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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18. The detector signal processing chain of the ISO long wavelength spectrometer

Author

J. P. Chabaud, Matthew Joseph Griffin, C. Delettrez, C. Le Naour, and Sarah E. Church

Subjects
Physics, Transimpedance amplifier, Signal processing, Spectrometer, Physics::Instrumentation and Detectors, business.industry, Amplifier, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy and Astrophysics, Signal, Signal chain, Analog signal, Optics, Space and Planetary Science, business, Astrophysics::Galaxy Astrophysics
Abstract

This paper describes the analogue signal processing chain for the detectors in the Long Wavelength Spectrometer (LWS) to be flown on board the Infrared Space Observatory (ISO) satellite. The satellite, its mission, and the on-board experiments are briefly reviewed, and the configuration of the LWS Detector Subsystem is described. Two possible signal readout and amplification schemes, based on the Transimpedance Amplifier (TIA) and the Integrating Amplifier (IA) are discussed. The reasons for the choice of the IA for the LWS are outlined. The design of the complete LWS detector signal chain is presented.

Published
1994

19. Criticality experiments for validation of cross sections: the 237Np case

Author

C. Le Naour, J.N. Wilson, D. Tarrío, Marie-Olga Sornein, Christoph A. Stephan, C. Paradela, L. Audouin, B. Berthier, L. Tassan-Got, L.S. Leong, I. Duran, Institut de Physique Nucléaire d'Orsay (IPNO), 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, Large Hadron Collider, 010308 nuclear & particles physics, Fission, QC1-999, Actinide, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Enriched uranium, 01 natural sciences, Neutron temperature, Nuclear physics, Cross section (physics), Criticality, 0103 physical sciences, Neutron, 010306 general physics
Abstract

International audience; 237Np is one of the actinides which is most abundantly produced in present reactors, and it could be a good candidate for incineration due to its long life time. However this requires a good knowledge of neutron cross sections. The n_TOF collaboration has carried out a fission cross section measurement at the n_TOF neutron facility at CERN, spanning a very broad energy range, from a fraction of eV to GeV. When compared to previous measurements the n_TOF fission cross section appears to be higher by 5-7% beyond the first fission threshold. We show however that several previous measurements, although consistent with each other, are dependent through re-normalization procedures. To check the relevance of n_TOF data, we simulate an experiment, performed at Los Alamos, with a sphere of 237Np of 6 kg surrounded by enriched uranium 235U, so as to reach criticity with fast neutrons. When introducing the n_TOF data for the fission cross section of 237Np, the simulation predicts a multiplicating factor keff in better agreement with the experiment as the deviation of 750 pcm is reduced to 250 pcm. We explore also the hypothesis of possible deficiencies of the inelastic cross section in 235U which has been invoked by some authors to explain the deviation of 750 pcm. However, the large distortion that should be applied to reconcile the critical experiment with its simulation discredits this option. These outcomes support the hypothesis of a higher fission cross section of 237Np.

Published
2011

20. Neutron-induced fission cross section ofnatPb andBi209from threshold to 1 GeV: An improved parametrization

Author

D. Tarrío, A. J. M. Plompen, I. Goncalves, G. Rudolf, I. Lopes, S. David, G. Tagliente, C. Lederer, Thomas Rauscher, D. Karadimos, M. Embid-Segura, Roberto Capote, B. Haas, Manuel Lozano, F. Neves, J. Marganiec, L. Ferrant, S. Andriamonje, D. Karamanis, I. Dillmann, J. Salgado, A. Poch, G. Aerts, V. Ketlerov, Alfredo Ferrari, R. Ferreira-Marques, A. Goverdovski, F. Alvarez-Velarde, C. Papachristodoulou, P. F. Mastinu, F. Gunsing, C. Papadopoulos, S. Isaev, Gerald Badurek, D. Trubert, Cristian Massimi, R. Dolfini, L. Sarchiapone, B. Berthier, F. Gramegna, E. Griesmayer, L. Tavora, Michael Heil, G. Vannini, Ralf Plag, A. Carrillo de Albornoz, E. Kossionides, P. Rullhusen, P. E. Koehler, Javier Praena, D. Villamarin, H. Leeb, Marco T. Pigni, Carlos Guerrero, R. Vlastou, U. Abbondanno, Heinz Oberhummer, M. Rosetti, P. M. Milazzo, I. Duran, E. Gonzalez-Romero, A. Plukis, C. Santos, E. Jericha, J. Cox, W.I. Furman, C. Paradela, H. Frais-Koelbl, S. Lukic, A. Lindote, A. Herrera-Martinez, N. Patronis, Laurent Tassan-Got, F. Bečvář, M. Krtička, F. Calviño, Marco Calviani, E. Mendoza, Roberto Losito, M. Oshima, Alberto Mengoni, C. Moreau, T. Martinez, J. Andrzejewski, F. Voss, M. Igashira, C. Le Naour, Carlo Rubbia, V. Vlachoudis, K. Wisshak, L. Fitzpatrick, E. Berthoumieux, R. Sarmento, S. O'Brien, Nicola Colonna, V. Konovalov, H. Wendler, K. Fujii, Rene Reifarth, R. C. Haight, P. Pavlopoulos, J. M. Quesada, L. Audouin, Fabio Belloni, Michael Wiescher, S. Walter, C. Carrapiço, C. Eleftheriadis, M. Kerveno, I. Savvidis, L. Perrot, Yacine Kadi, P. Assimakopoulos, C. Pretel, V. Chepel, P. Baumann, W. Dridi, S. Marrone, J. L. Tain, J. Pancin, E. Chiaveri, D. Cano-Ott, P. Cennini, M. Mosconi, C. Stephan, M. Dahlfors, R. Terlizzi, P. Vaz, Alberto Ventura, Aaron Couture, C. Lampoudis, A. Pavlik, C. Domingo-Pardo, L. Marques, F. Käppeler, and G. Cortes

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Isotopes of uranium, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Fission, Nuclear Theory, Threshold energy, 7. Clean energy, 01 natural sciences, Nuclear physics, 0103 physical sciences, Uranium-235, Neutron detection, Neutron source, Neutron, Nuclear Experiment, 010306 general physics
Abstract

Neutron-induced fission cross sections for {sup nat}Pb and {sup 209}Bi were measured with a white-spectrum neutron source at the CERN Neutron Time-of-Flight (n{sub T}OF) facility. The experiment, using neutrons from threshold up to 1 GeV, provides the first results for these nuclei above 200 MeV. The cross sections were measured relative to {sup 235}U and {sup 238}U in a dedicated fission chamber with parallel plate avalanche counter detectors. Results are compared with previous experimental data. Upgraded parametrizations of the cross sections are presented, from threshold energy up to 1 GeV. The proposed new sets of fitting parameters improve former results along the whole energy range.

Published
2011

21. Neutron-induced fission cross section ofU234andNp237measured at the CERN Neutron Time-of-Flight (n_TOF) facility

Author

J. Pancin, E. Chiaveri, D. Cano-Ott, V. Chepel, P. Baumann, C. Moreau, L. Perrot, B. Berthier, C. Carrapiço, G. Aerts, M. Dahlfors, L. Tavora, W.I. Furman, P. Vaz, Michael Heil, C. Le Naour, E. Gonzalez-Romero, E. Kossionides, Alberto Ventura, Aaron Couture, Javier Praena, M. Embid-Segura, A. Lindote, C. A. Papachristodoulou, S. David, D. Karamanis, Manuel Lozano, P. E. Koehler, W. Dridi, A. Plukis, L. Ferrant, C. Lampoudis, A. Pavlik, P. Rullhusen, G. Tagliente, S. Walter, C. Domingo-Pardo, C. Santos, Ralf Plag, Marco Calviani, F. Gramegna, S. Marrone, F. Bečvář, P. Cennini, H. Álvarez, Carlos Guerrero, U. Abbondanno, I. Savvidis, J. L. Tain, Iris Dillmann, Alfredo Ferrari, R. Ferreira-Marques, E. Jericha, M. Mosconi, F. Alvarez-Velarde, Heinz Oberhummer, R. Vlastou, J. Marganiec, S. Andriamonje, J. Salgado, M. Kerveno, Gerald Badurek, C. Papadopoulos, C. Stephan, R. C. Haight, A. Poch, I. Goncalves, K. Fujii, M. C. Vincente, R. Terlizzi, Thomas Rauscher, P. F. Mastinu, P. Assimakopoulos, D. Karadimos, S. O'Brien, I. Duran, L. Audouin, Rene Reifarth, A. Herrera-Martinez, N. Patronis, S. Isaev, M. Krtička, F. Calviño, T. Martinez, P. Pavlopoulos, Alberto Mengoni, L. Sarchiapone, J. M. Quesada, Michael Wiescher, F. Käppeler, J. Cox, M. Igashira, E. Berthoumieux, Laurent Tassan-Got, C. Eleftheriadis, C. Pretel, Yacine Kadi, D. Villamarin, Marco T. Pigni, F. Voss, Nicola Colonna, H. Leeb, A. J. M. Plompen, C. Paradela, G. Rudolf, I. Lopes, S. Lukic, B. Haas, G. Vannini, F. Gunsing, P. M. Milazzo, D. Trubert, Cristian Massimi, M. Oshima, J. Andrzejewski, Carlo Rubbia, G. Cortes, D. Tarrío, V. Vlachoudis, Roberto Capote, F. Neves, and K. Wisshak

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Isotopes of uranium, 010308 nuclear & particles physics, Fission, Hadron, 01 natural sciences, Nuclear physics, Time of flight, Cross section (physics), 0103 physical sciences, Neutron, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

A high-resolution measurement of the neutron-induced fission cross section of U234 and Np237 has been performed at the CERN Neutron Time-of-Flight facility. The cross sections have been determined in a wide energy range from 1 eV to 1 GeV using the evaluated U235 cross section as reference. In these measurements the energy determination for the U234 resonances could be improved, whereas previous discrepancies for the Np237 resonances were confirmed. New cross-section data are provided for high neutron energies that go beyond the limits of prior evaluations, obtaining important differences in the case of Np237. © 2010 The American Physical Society.

Published
2010

23. Neutron-induced fission cross sections measurements at n_TOF

Author

L. Tassan-Got, L. Ferrant, I. Duran, L. Audouin, B. Berthier, D. Trubert, C. Paradela, C. Le Naour, S. Isaev, and C. Stephan

Subjects
Nuclear physics, Nuclear reaction, Physics, Orders of magnitude (time), Fission, Nuclear Theory, Physics::Accelerator Physics, Nuclear data, Spallation, Neutron, Actinide, Nuclear Experiment, Neutron temperature
Abstract

The neutron-induced fission cross sections of 233 U, 234 U, 235 U, 238 U, 232 Th, 237 Np, 209 Bi, nat Pb have been measured at the n TOF facility at CERN over 9 orders of magnitude in neutron energy using 235 Ua s a reference. Parallel Plate Avalanche Counters were used to detect both fission fragments in coincidence, thus efficiently discriminating fissions from other reactions. Data benefit from the remarkable energy resolution of the n TOF facility. They are found in overall good agreement with databases and previous measurements, but some clear discrepancies can be put in evidence. These data are the first full coverage of the high-energy region (up to 1GeV). 1 Motivations Although the neutron-induced fission from some actinides like 235 U and 238 U has been extensively measured in the thermal and epithermal region up to a few MeV due to their key role in nuclear power, many nuclei that are important for the fuel cy- cle or for future reactors such as thorium-based reactors are not so well known. Furthermore, at higher energies, measurements are less numerous and beyond a few MeV they become scarce at best. The design of fast reactors requires precise knowledge of the nuclei behavior in the MeV region, and the design of Accelerator Driven System (ADS) extends such requirements to a few tens of MeV due to the very hard neutron spectra created by the ADS spallation source. In order to design such spallation sources, precise information about their constitutive material (lead and bismuth) are also required. In a more fundamental point of view, it is well know that in the few tens of MeV energy region, fission reactions are not necessarily isotropic; but measurements of these phenom- enons are very scarce and concern only a very few nuclei. Also, the transition from the compound nucleus regime toward the spallation regime has never been properly measured with neutrons, and the modeling of nuclear reactions could greatly benefit from the comparison of such neutron-induced reactions with the more well-known proton-induced reactions.

Published
2007

24. Measurements of high-energy neutron-induced fission ofnatPb and209Bi

Author

H. Álvarez, J. L. Tain, D. Cano-Ott, P. E. Koehler, Marco T. Pigni, Rene Reifarth, P. Pavlopoulos, I. Dillmann, J. M. Quesada, Masayuki Igashira, M. Kerveno, Christoph A. Stephan, G. Cortes, S. Lukic, G. Aerts, D. Tarrío, Corrie S. Moreau, S. Isaev, U. Abbondanno, F. Gunsig, Ralf Plag, Roberto Capote, A. Plukis, P.A. Assimakopoulos, F. Alvarez-Velarde, Gerald Badurek, G. Vannini, G. Tagliente, A. Ventura, C. Eleftheriadis, A. Herrera-Martinez, N. Patronis, W.I. Furman, C. Rubbia, S. Walter, A. Lindote, Arnaud Ferrari, M. C. Vicente, Thomas Rauscher, A. J. M. Plompen, R. Vlastou, L. Perrot, J. Marganiec, Alberto Mengoni, C. A. Papachristodoulou, E. Berthoumieux, S. Andriamonje, I. Lopes, L. Sarchiapone, D. Karadimos, E. Chiaveri, P. F. Mastinu, I. Savvidis, James L. Cox, L. Tassan-Got, Carlos Guerrero, E. González-Romero, H. Leeb, Heinz Oberhummer, R. C. Haight, F. Becvar, C. Paradela, L. Audouin, M. Krtička, C. Le Naour, R. Ferreira-Marques, T. Martinez, D. Trubert, Michael Wiescher, F. Voss, Cristian Massimi, K. Wisshak, S. David, B. Berthier, Y. Kadi, Michael Heil, Marco Calviani, E. Kossionides, I. Duran, V. Chepel, M. Oshima, G. Rudolf, C. T. Papadopoulos, Javier Praena, L. Ferrant, J. Andrzejewski, V. Vlachoudis, F. Neves, P. M. Milazzo, P. Baumann, D. Villamarin, C. Pretel, E. Jericha, K. Fujii, C. Santos, M. Embid-Segura, Isabel S. Gonçalves, S. Marrone, Manuel Lozano, L. Tavora, P. Rullhusen, P. Cennini, M. Mosconi, S. O'Brien, Nicola Colonna, F. Gramegna, R. Terlizzi, F. Käppeler, J. Pancin, J. Salgado, A. Poch, M. Dahlfors, C. Carrapiço, P. Vaz, Aaron Couture, B. Haas, F. Calviño, W. Dridi, C. Lampoudis, A. Pavlik, C. Domingo-Pardo, D. Karamanis, D. Tarrío, L. Tassan-Got, L. Audouin, B. Berthier, I. Duran, L. Ferrant, S. Isaev, C. Le Naour, C. Paradela, C. Stephan, D. Trubert, U. Abbondanno, G. Aert, H. Álvarez, F. Álvarez-Velarde, S. Andriamonje, J. Andrzejewski, P. Assimakopoulo, G. Badurek, P. Baumann, F. Becvár, 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. Dillmann, C. Domingo-Pardo, W. Dridi, C. Eleftheriadi, M. Embid-Segura, A. Ferrari, R. Ferreira-Marque, K. Fujii, W. Furman, I. Gonçalve, E. González-Romero, F. Gramegna, C. Guerrero, F. Gunsig, B. Haa, R. Haight, M. Heil, A. Herrera-Martinez, M. Igashira, E. Jericha, Y. Kadi, F. Käppeler, D. Karadimo, D. Karamani, M. Kerveno, P. Koehler, E. Kossionide, M. Krticka, C. Lampoudi, H. Leeb, A. Lindote, I. Lope, M. Lozano, S. Lukic, J. Marganiec, S. Marrone, T. Martínez, C. Massimi, P. Mastinu, A. Mengoni, P.M. Milazzo, C. Moreau, M. Mosconi, F. Neve, H. Oberhummer, S. O’Brien, M. Oshima, J. Pancin, C. Papachristodoulou, C. Papadopoulo, 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, G. Tagliente, J.L. Tain, L. Tavora, R. Terlizzi, G. Vannini, P. Vaz, A. Ventura, D. Villamarin, M.C. Vicente, V. Vlachoudi, R. Vlastou, F. Vo, S. Walter, M. Wiescher, and K. Wisshak

Subjects
High energy, Engineering, Fission, business.industry, Physics, QC1-999, Nuclear engineering, Nuclear Theory, Creative commons, Engineering physics, neutron time-of-flight facility, Neutron, Nuclear Experiment, business, License
Abstract

he CERN Neutron Time-Of-Flight (n_TOF) facility is well suited to measure low cross sections as those of neutron-induced fission in subactinides. The cross section ratios of (nat)Pb and (209)Bi relative to (235)U and (238)U were measured using PPAC detectors and a fragment coincidence method that allows us to identify the fission events. The present experiment provides first results for neutron-induced fission up to 1 GeV. Good agreement is found with previous experimental data below 200 MeV. The comparison with proton-induced fission indicates that the limiting regime where neutron-induced and proton-induced fission reach equal cross sections is close to 1 GeV.

Published
2010

25. THE SOLAR NEUTRINO PROBLEM: LOW ENERGY MEASUREMENTS OF THE 7<font>Be</font>(<font>p</font>,γ)8<font>B</font> CROSS SECTION

Author

L. Brillard, J.F. Chemin, C. Le Naour, J. Kiener, C. Angulo, A. Coc, J. N. Scheurer, G. Bogaert, A. Lefebvre, M. Jacotin, Vincent Tatischeff, P. Aguer, G. Claverie, J. P. Thibaud, S. Barhoumi, E. Virassamynaiken, M. Hussonois, S. Ouichaoui, and F. Hammache

Subjects
Physics, Nuclear physics, Cross section (physics), Low energy, Solar neutrino problem
Published
2001

26. Experimental verification of neutron phenomenology in lead and transmutation by adiabatic resonance crossing in accelerator driven systems

Author

José M. Martínez-Val, J.B. Viano, P. Cennini, J. Bueno, Alberto Abánades, H. Arnould, R. Del Moral, I. Goulas, E. Savvidis, F. Casagrande, S. Vieira, R. Fernandez, J. Oropesa, A. Apostolakis, A. Giorni, S. Dı́ez, A. Tzima, M. Hussonnois, S. Buono, L. Dumps, J. A. Rubio, C. Rubbia, J.M. Loiseaux, George Kitis, C. Eleftheriadis, M. Perlado, C. Le Naour, J. Gálvez, D. Trubert, E. Perez-Enciso, Vasilis Vlachoudis, Konstantin Zioutas, J. P. Revol, J. Aleixandre, M. Embid, R. Klapisch, E. Cerro, P. Kokkas, A. Pérez-Navarro, D. Brozzi, O. González, E. Belle, M. Poza, Y. Kadi, H. Nifenecker, F. Saldana, A. Angelopoulos, J. I. Collar, F. Schussler, Federico Carminati, J. Tamarit, O. Méplan, S. Andriamonje, C. A. Bompas, I. Papadopoulos, V. Lacoste, J. Garcia, Pantelis Karaiskos, A. Placci, Loukas Sakelliou, C. López, E. González, P. Pavlopoulos, C. Sirvent, C. Geles, D. Heuer, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Nuclear transmutation, Proton, 010308 nuclear & particles physics, Fission, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Resonance (particle physics), Accelerators and Storage Rings, Nuclear physics, Neutron capture, 0103 physical sciences, Physics::Accelerator Physics, Neutron, Spallation, 010306 general physics, Adiabatic process, Nuclear Experiment
Abstract

Energy and space distributions of spallation neutrons (from 2.5 and 3.57 GeV/c CERN proton beams) slowing down in a 3.3 x 3.3 x 3 m3 lead volume and neutron capture rates on long-lived fission fragments 99 Tc and 129 I demonstrate that Adiabatic Resonance Crossing (ARC) can be used to eliminate efficiently such nuclear waste and validate innovative simulation.

Published
1999

27. Neutron driven nuclear transmutation by adiabatic resonance crossing

Author

Federico Carminati, Loukas Sakelliou, C. López, A. Tzima, O. Méplan, A. Apostolakis, D. Heuer, M. Hussonnois, M. Perlado, Ioannis Papadopoulos, C. A. Bompas, J.B. Viano, M. Embid, J. Tamarit, P. Pavlopoulos, J.M. Loiseaux, A. Giorni, S. Dı́ez, J. Aleixandre, G. Zarris, M. Macri, F. Casagrande, S. Andriamonje, E. Pérez, Alberto Abánades, H. Arnould, R. Del Moral, I. Goulas, S. Vieira, O. González, E. Cerro, J. A. Rubio, J. Galvez, C. Roche, K. Sakelariou, C. Geles, C. Rubbia, E. González, Panagiotis Kokkas, C. Eleftheriadis, J. A. Garcia, Vasilis Vlachoudis, J. P. Revol, V. Lacoste, Y. Kadi, A. Angelopoulos, S. Buono, H. Nifenecker, F. Saldana, J. Bueno, D. Trubert, C. Le Naour, R. Klapisch, F. Attale, R. Fernandez, A. Pérez-Navarro, E. Belle, M. Poza, G. Kittis, F. Schussler, P. Cennini, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), Fioni G. Faust H. Oberstedt S. Hambsch F.-J., and bibliotheque, LPSC

Subjects
Physics, Nuclear reaction, Nuclear transmutation, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], 010308 nuclear & particles physics, Fission, Nuclear engineering, Radioactive waste, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010403 inorganic & nuclear chemistry, 7. Clean energy, 01 natural sciences, Resonance (particle physics), 0104 chemical sciences, Energy amplifier, Nuclear physics, 0103 physical sciences, Neutron, Nuclear Experiment, Adiabatic process
Abstract

The use of accelerator driven system (ADS) like for instance the Energy Amplifier concept (EA) proposed by C. Rubbia and his group might be one of the solutions to solve the energy problem and in particular to answer the question: what could we do with the nuclear waste produced by the present nuclear reactors? We present in this paper the EA concept, which is illustrated by two experiments performed at the CERN-PS facility. One of them is the TARC (Transmutation by Adiabatic Resonance crossing) experiment which is designed to demonstrate the high efficiency offered by the EA to destroy the long-lived fission fragments.

Published
1998

28. Transmutation of [sup 99]Tc in a low lethargy medium as a function of the neutron energy

Author

K. Sakelariou, A. Apostolakis, M. Hussonnois, C. Le Naour, C. Roche, D. Trubert, Vasilis Vlachoudis, S. Buono, J. P. Revol, J. Bueno, J.B. Viano, A. Pérez-Navarro, A. Angelopoulous, E. Belle, Y. Kadi, R. Fernandez, F. Shussler, J.M. Loiseaux, M. Perlado, M. Poza, Ioannis Papadopoulos, J. Aleixandre, M. Embid, P. Cennini, A. Giorni, S. Dı́ez, D. Heuer, Loukas Sakelliou, G. Zarris, C. López, E. Pérez, J. Tamarit, Alberto Abánades, H. Arnould, Federico Carminati, R. Del Moral, P. Pavlopoulos, I. Goulas, J. Galvez, S. Vieira, A. Tzima, M. Macri, F. Casagrande, O. Méplan, C. A. Bompas, O. González, E. Cerro, R. Klapish, C. Rubbia, V. Lacoste, George Kitis, C. Geles, E. González, Panagiotis Kokkas, S. Andriamonje, C. Eleftheriadis, J. A. Rubio, H. Nifenecker, F. Saldana, and J. A. Garcia

Subjects
Nuclear physics, Physics, Range (particle radiation), Proton, Nuclear transmutation, Neutron flux, Neutron cross section, Neutron, Spallation, Neutron temperature
Abstract

In the TARC experiment the differential neutron flux φ(E,r) of a spallation of 2.5 and 3.5 GeV/c proton in large lead block is measured in the range between 0.1 eV and 1.5 MeV. A new technique, using small quantities (less than 0.1 gram) of material, is used for measuring the transmutation rate as a function of neutron energy in the range between 0.1 eV up to a few keV. The method is applied to a target of 86 mg (99Tc) mixed with 1.7 g of Aluminum. From these measurements the energy profile of the capture cross section can be extracted.

Published
1998

29. Criticality experiments and benchmarks for cross section evaluation: the neptunium case

Author

Christoph A. Stephan, C. Paradela, L. Audouin, J.N. Wilson, B. Berthier, L. Tassan–Got, L.S. Leong, C. Le Naour, I. Duran, and D. Tarrío

Subjects
Nuclear physics, Nuclear reaction, Cross section (physics), Criticality, Chemistry, Fission, Physics, QC1-999, Uranium-235, Neutron, Inelastic scattering, Neutron temperature
Abstract

The 237 Np neutron-induced fission cross section has been recently measured in a large energy range (from eV to GeV) at the n_TOF facility at CERN. When compared to previous measurement the n_TOF fission cross section appears to be higher by 5-7% beyond the fission threshold. To check the relevance of n_TOF data, we apply a criticality experiment performed at Los Alamos with a 6 kg sphere of 237 Np, surrounded by enriched uranium 235 U so as to approach criticality with fast neutrons. The multiplication factor ke f f of the calculation is in better agreement with the experiment (the deviation of 750 pcm is reduced to 250 pcm) when we replace the ENDF/B-VII.0 evaluation of the 237 Np fission cross section by the n_TOF data. We also explore the hypothesis of deficiencies of the inelastic cross section in 235 U which has been invoked by some authors to explain the deviation of 750 pcm. With compare to inelastic large distortion calculation, it is incompatible with existing measurements. Also we show that the v of 237 Np can hardly be incriminated because of the high accuracy of the existing data. Fission rate ratios or averaged fission cross sections measured in several fast neutron fields seem to give contradictory results on the validation of the 237 Np cross section but at least one of the benchmark experiments, where the active deposits have been well calibrated for the number of atoms, favors the n_TOF data set. These outcomes support the hypothesis of a higher fission cross section of 237 Np.

Published
2013

30. Observation of the diffuse galactic emission at 6.2 μm

Author

I. Ristorcelli, François Pajot, J. Leotin, C. Meny, C. Le Naour, J.-M. Lamarre, M. Giard, and G. Serra

Subjects
Interstellar medium, Physics, Infrared, Radiation field, Excited state, Emissivity, Astronomy, Galactic coordinate system, Astrophysics, Surface brightness, Disc
Abstract

We present the observation of the 6.2 μm emission of the inner galactic disk obtained with the AROME balloon‐borne experiment. The galactic coordinates of the covered region are −5°≤1≤35° and ‖ b‖≤6°, with an angular resolution of 0.7°. The measurements reveal the existence of an emission feature at 6.2 μm all over this region. The averaged 6.2 μm surface brightness (‖ b ‖≤1°, 8°≤1≤35°) is λIλ=(1.2±0.3) 10−5 Wm−2 sr−1, with a continuum λ Iλ=(5.9±1.2) 10−6 Wm−2 sr−1 and a feature’s intensity Δλ Iλ=(6.1±1.3) 10−7 Wm−2 sr−1. We can compare this value to the 3.3 μm emission observed with AROME (Giard et al. 19881) and to the 12 μm (IRAS) surface brightness: the ratios are respectively Δλ Iλ (6.2/3.3)=9±2 (extinction corrected) and Δλ Iλ 6.2/λ Iλ12=0.09±0.02; these color ratios are similar to those obtained on UV excited nebulae, despite very different radiation field intensities. This supports the idea of a common origin for the near infrared radiation from excited nebulae and the diffuse interstellar medium:...

Published
1994

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

Author

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

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

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

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