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15 results on '"n-tof"'

1. The n_TOF Total Absorption Calorimeter response to γ-ray cascades following neutron capture in minor actinides.

Author

Guerrero, C., Cano-Ott, D., Mendoza, E., and Taín, J. L.

Subjects
*GAMMA rays, *NEUTRON capture, *ACTINIDE elements, *MASS attenuation coefficients, *NUCLEAR physics, *NUCLEAR excitation, *PHOTONS
Abstract

Neutron capture cross sections of minor actinides are measured at n_TOF using the segmented Total Absorption Calorimeter (TAC), a 4π detector made of 40 BaF2 crystals. As well as these measurements, the experimental data regarding the detection of the prompt γ-ray cascades (crystal multiplicity and deposited energy) provide valuable information about the de-excitation mechanism of the compound nucleus. In this work we have used this source of information to perform a preliminary study on the Photon Strength Functions of some minor actinides. [ABSTRACT FROM AUTHOR]

Published
2009
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2. Experimental nuclear astrophysics in Italy

Author

Broggini, C., Straniero, O., Taiuti, M. G. F., De Angelis, G., Benzoni, G., Bruno, G. E., Bufalino, S., Cardella, G., Colonna, N., Contalbrigo, M., Cosentino, G., Cristallo, S., Curceanu, C., De Filippo, E., Depalo, R., Di Leva, A., Feliciello, A., Gammino, S., Galata, A., La Cognata, M., Lea, R., Leoni, S., Lombardo, I., Manzari, V., Mascali, D., Massimi, C., Mengoni, A., Mengoni, D., Napoli, D. R., Palmerini, Sara, Piano, S., Pirrone, S., Pizzone, R. G., Politi, G., Prati, P., Prete, G., Russotto, P., Tagliente, Giovanni, Urciuoli, G. M., Broggini C., Straniero O., Taiuti M.G.F., De Angelis G., Benzoni G., Bruno G.E., Bufalino S., Cardella G., Colonna N., Contalbrigo M., Cosentino G., Cristallo S., Curceanu C., De Filippo E., Depalo R., Di Leva A., Feliciello A., Gammino S., Galata A., La Cognata M., Lea R., Leoni S., Lombardo I., Manzari V., Mascali D., Massimi C., Mengoni A., Mengoni D., Napoli D.R., Palmerini S., Piano S., Pirrone S., Pizzone R.G., Politi G., Prati P., Prete G., Russotto P., Tagliente G., Urciuoli G.M., Broggini, C., Straniero, O., Taiuti, M. G. F., De Angelis, G., Benzoni, G., Bruno, G. E., Bufalino, S., Cardella, G., Colonna, N., Contalbrigo, M., Cosentino, G., Cristallo, S., Curceanu, C., De Filippo, E., Depalo, R., Di Leva, A., Feliciello, A., Gammino, S., Galata, A., La Cognata, M., Lea, R., Leoni, S., Lombardo, I., Manzari, V., Mascali, D., Massimi, C., Mengoni, A., Mengoni, D., Napoli, D. R., Palmerini, S., Piano, S., Pirrone, S., Pizzone, R. G., Politi, G., Prati, P., Prete, G., Russotto, P., Tagliente, G., and Urciuoli, G. M.

Subjects
S-FACTOR, RECOIL SEPARATOR ERNA, PULSE-SHAPE DISCRIMINATION, CROSS-SECTION, 1ST MEASUREMENT, EJ 299-33, N-TOF, NEUTRON, C-12(ALPHA, EVOLUTION, Nuclear Theory, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Physics::History of Physics, Nuclear Theory (nucl-th), Astrophysics - Solar and Stellar Astrophysics, Nuclear Astrophysics, Solar and Stellar Astrophysics, Nuclear Theory, Solar and Stellar Astrophysics, Nuclear Experiment (nucl-ex), Nuclear Experiment, Solar and Stellar Astrophysics (astro-ph.SR)
Abstract

Nuclear astrophysics, the union of nuclear physics and astronomy, went through an impressive expansion during the last twenty years. This could be achieved thanks to milestone improvements in astronomical observations, cross section measurements, powerful computer simulations and much refined stellar models. Italian groups are giving quite important contributions to every domain of nuclear astrophysics, sometimes being the leaders of worldwide unique experiments. In this paper we will discuss the astrophysical scenarios where nuclear astrophysics plays a key role and we will provide detailed descriptions of the present and future of the experiments on nuclear astrophysics which belong to the scientific programme of INFN (the National Institute for Nuclear Physics in Italy)., Added paragraphs 5.6 and 7.2. Paragraph 7.3 (former 7.2) revised. Accepted for publication in La Rivista del Nuovo Cimento

Published
2019

3. High-accuracy determination of the neutron flux in the new experimental area n_TOF-EAR2 at CERN

Author

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, Sabaté-Gilarte, M., Barbagallo, Massimo, Colonna, Nicola, Calviño Tavares, Francisco, Casanovas Hoste, Adrià, Cortés Rossell, Guillem Pere, Tarifeño Saldivia, Ariel Esteban, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Sabaté-Gilarte, M., Barbagallo, Massimo, Colonna, Nicola, Calviño Tavares, Francisco, Casanovas Hoste, Adrià, Cortés Rossell, Guillem Pere, and Tarifeño Saldivia, Ariel Esteban

Abstract

A new high flux experimental area has recently become operational at the n_TOF facility at CERN. This new measuring station, n_TOF-EAR2, is placed at the end of a vertical beam line at a distance of approximately 20m from the spallation target. The characterization of the neutron beam, in terms of flux, spatial profile and resolution function, is of crucial importance for the feasibility study and data analysis of all measurements to be performed in the new area. In this paper, the measurement of the neutron flux, performed with different solid-state and gaseous detection systems, and using three neutron-converting reactions considered standard in different energy regions is reported. The results of the various measurements have been combined, yielding an evaluated neutron energy distribution in a wide energy range, from 2meV to 100MeV, with an accuracy ranging from 2%, at low energy, to 6% in the high-energy region. In addition, an absolute normalization of the n_TOF-EAR2 neutron flux has been obtained by means of an activation measurement performed with 197Au foils in the beam., Postprint (author's final draft)

Published
2017

4. High-accuracy determination of the neutron flux in the new experimental area n_TOF-EAR2 at CERN

Author

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

Subjects
Nuclear and High Energy Physics, Astrophysics::High Energy Astrophysical Phenomena, Flux, Neutron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, n-tof, Neutron flux, 0103 physical sciences, CERN, Spallation, 010306 general physics, Nuclear Experiment, n_TOF, EAR2, neutron flux measurement, Physics, Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, Física [Àrees temàtiques de la UPC], 010308 nuclear & particles physics, Neutron radiation, Neutron temperature, Radiation flux, Physics::Accelerator Physics, Beam (structure)
Abstract

A new high flux experimental area has recently become operational at the n_TOF facility at CERN. This new measuring station, n_TOF-EAR2, is placed at the end of a vertical beam line at a distance of approximately 20m from the spallation target. The characterization of the neutron beam, in terms of flux, spatial profile and resolution function, is of crucial importance for the feasibility study and data analysis of all measurements to be performed in the new area. In this paper, the measurement of the neutron flux, performed with different solid-state and gaseous detection systems, and using three neutron-converting reactions considered standard in different energy regions is reported. The results of the various measurements have been combined, yielding an evaluated neutron energy distribution in a wide energy range, from 2meV to 100MeV, with an accuracy ranging from 2%, at low energy, to 6% in the high-energy region. In addition, an absolute normalization of the n_TOF-EAR2 neutron flux has been obtained by means of an activation measurement performed with 197Au foils in the beam. © 2017, SIF, Springer-Verlag GmbH Germany.

Published
2017
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5. GEANT4 simulation of the neutron background of the C6D6 set-up for capture studies at n_TOF

Author

collaboration, n_TOF, Žugec, P., Colonna, N., Bosnar, D., Altstadt, S., Andrzejewski, J., Audouin, L., Barbagallo, M., Bécares, V., Bečvář, F., Belloni, F., Berthoumieux, E., Billowes, J., Boccone, V., Brugger, M., Calviani, M., Calviño, F., Cano-Ott, D., Carrapiço, C., Cerutti, F., Chiaveri, E., Chin, M., Cortés, G., Cortés-Giraldo, M. A., Diakaki, M., Domingo-Pardo, C., Dressler, R., Duran, I., Dzysiuk, N., Eleftheriadis, C., Ferrari, A., Fraval, K., Ganesan, S., García, A. R., Giubrone, G., Gómez-Hornillos, M. B., Gonçalves, I. F., González-Romero, E., Griesmayer, E., Guerrero, C., Gunsing, F., Gurusamy, P., Heinitz, S., Jenkins, D. G., Jericha, E., Kadi, Y., Käppeler, F., Karadimos, D., Kivel, N., Koehler, P., Kokkoris, M., Krtička, M., Kroll, J., Langer, C., Lederer, C., Leeb, H., Leong, L. S., Meo, S. Lo, Losito, R., Manousos, A., Marganiec, J., Martìnez, T., Massimi, C., Mastinu, P. F., Mastromarco, M., Meaze, M., Mendoza, E., Mengoni, A., Milazzo, P. M., Mingrone, F., Mirea, M., Mondalaers, W., Paradela, C., Pavlik, A., Perkowski, J., Plompen, A., Praena, J., Quesada, J. M., Rauscher, T., Reifarth, R., Riego, A., Roman, F., Rubbia, C., Sarmento, R., Saxena, A., Schillebeeckx, P., Schmidt, S., Schumann, D., Tagliente, G., Tain, J. L., Tarrío, D., Tassan-Got, L., Tsinganis, A., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Versaci, R., Vermeulen, M. J., Vlachoudis, V., Vlastou, R., Wallner, A., Ware, T., Weigand, M., Weiß, C., Wright, T., Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, P. Zugec, N. Colonna, D. Bosnar, S. Altstadt, J. Andrzejewski, L. Audouin, M. Barbagallo, V. Becare, F. Becvar, F. Belloni, E. Berthoumieux, J. Billowe, V. Boccone, M. Brugger, M. Calviani, F. Calvino, D. Cano-Ott, C. Carrapio, F. Cerutti, E. Chiaveri, M. Chin, G. Corte, M. A. Cortes-Giraldo, M. Diakaki, C. Domingo-Pardo, R. Dressler, I. Duran, N. Dzysiuk, C. Eleftheriadi, A. Ferrari, K. Fraval, S. Ganesan, A. R. Garcia, G. Giubrone, M. B. Gomez-Hornillo, I. F. Gonalve, E. Gonzalez-Romero, E. Griesmayer, C. Guerrero, F. Gunsing, P. Gurusamy, S. Heinitz, D. G. Jenkin, E. Jericha, Y. Kadi, F. Kaeppler, D. Karadimo, N. Kivel, P. Koehler, M. Kokkori, M. Krticka, J. Kroll, C. Langer, C. Lederer, H. Leeb, L. S. Leong, S. Lomeo, R. Losito, A. Manouso, J. Marganiec, T. Mart-Nez, C. Massimi, P. F. Mastinu, M. Mastromarco, M. Meaze, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, M. Mirea, W. Mondalaer, C. Paradela, A. Pavlik, J. Perkowski, A. Plompen, J. Praenam, J. M. Quesadam, T. Rauscher, R. Reifarth, A. Riego, F. Roman, C. Rubbia, R. Sarmento, A. Saxena, P. Schillebeeckx, S. Schmidt, D. Schumann, G. Tagliente, J. L. Tain, D. Tarrio, L. Tassan-Got, A. Tsingani, S. Valenta, G. Vannini, V. Variale, P. Vaz, A. Ventura, R. Versaci, M. J. Vermeulen, V. Vlachoudi, R. Vlastou, A. Wallner, T. Ware, M. Weigand, C. Wei, T. Wright, Ventura, A., Mengoni, A., Lo Meo, S., and Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear

Subjects
Neutron capture, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, GEANT4 simulations, Neutron time of flight, Neutron background, n_TOF, FOS: Physical sciences, Neutron, N-TOF, 7. Clean energy, 01 natural sciences, Partícules (Física nuclear), Nuclear physics, Cross section (physics), 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Instrumentation, physics.ins-det, GEANT4, Line (formation), Particles (Nuclear physics), Physics, Bonner sphere, Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, GEANT4 simulation, Física [Àrees temàtiques de la UPC], 010308 nuclear & particles physics, Detector, Física, Neutron sensitivity, Instrumentation and Detectors (physics.ins-det), Neutron radiation, NEUTRON TIME OF FLIGHT, Background, Deuterium, N_TOF, Simulation
Abstract

The neutron sensitivity of the C6D6 detector setup used at n_TOF facility for capture measurements has been studied by means of detailed GEANT4 simulations. A realistic software replica of the entire n_TOF experimental hall, including the neutron beam line, sample, detector supports and the walls of the experimental area has beeni mplemented in the simulations. The simulations have been analyzed in the same manner as experimental data, in particular by applying the Pulse Height Weighting Technique. The simulations have been validated against a measurement of the neutron background performed with anatC sample, showing an excellent agreement above 1 keV. At lower energies, an additional component in the measured natC yield has been discovered, which prevents the use of natC data for neutron background estimates at neutron energies below a few hundred eV. The origin and time structure of the neutron background have been derived from the simulations. Examples of the neutron background for two different samples are demonstrating the important role of accurate simulations of the neutron background in capture cross-section measurements., JRC.D.4-Standards for Nuclear Safety, Security and Safeguards

Published
2014

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

Author

F. Bečvář, T. J. Wright, F. Cerutti, Mario Weigand, E. Gonzalez-Romero, Rene Reifarth, J. L. Tain, C. Lampoudis, C. Lederer, N. Kivel, Stefan Schmidt, M. Meaze, J. M. Quesada, F. Gunsing, J. Billowes, Jeri Kroll, P. Vaz, Srinivasan Ganesan, P. Gurusamy, K. Fraval, Cristian Massimi, Alberto Ventura, M. B. Gómez-Hornillos, E. Mendoza, C. Paradela, Javier Praena, R. Sarmento, Mario Barbagallo, E. Berthoumieux, M. S. Robles, A. Riego, M. Krtička, F. Calviño, M. A. Cortés-Giraldo, M. Mirea, G. Tagliente, Peter Schillebeeckx, N. Dzysiuk, Carlos Guerrero, A. Pavlik, T. Martinez, L. Audouin, Petar Žugec, Alfredo Ferrari, C. Domingo-Pardo, Roberto Losito, V. Variale, I. Duran, H. Leeb, M. Sabaté-Gilarte, M. Mastromarco, F. Käppeler, M. Diakaki, J. Perkowski, A. K. Saxena, P. M. Milazzo, J. Marganiec, A. Mallick, G. Vannini, Gerald Badurek, V. Boccone, S. Altstadt, A. Hernández-Prieto, A. J. M. Plompen, P. F. Mastinu, A. Manousos, C. Eleftheriadis, E. Jericha, G. Giubrone, E. Chiaveri, D. Cano-Ott, Alberto Mengoni, V. Bécares, Dorothea Schumann, Yacine Kadi, Rugard Dressler, C. Weiß, R. Versaci, P. E. Koehler, F. Mingrone, J. Andrzejewski, A. Tsinganis, G. Cortes, M. Kokkoris, D. Tarrío, Carlo Rubbia, Nicola Colonna, L.S. Leong, C. Langer, V. Vlachoudis, E. Griesmayer, T. Ware, C. Carrapiço, Anton Wallner, D. G. Jenkins, Laurent Tassan-Got, W. Mondalaers, Fabio Belloni, M. P. W. Chin, F. Roman, E. Leal-Cidoncha, I. Goncalves, Thomas Rauscher, M. J. Vermeulen, D. Karadimos, S. Valenta, A. R. García, M. Brugger, Marco Calviani, R. Vlastou, Damir Bosnar, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, TOF, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Ventura, A., Mengoni, A., C. Wei, E. Griesmayer, C. Guerrero, S. Altstadt, J. Andrzejewski, L. Audouin, G. Badurek, M. Barbagallo, V. Becare, F. Becvar, F. Belloni, E. Berthoumieux, J. Billowe, V. Boccone, D. Bosnar, M. Brugger, M. Calyiani, F. Calvino, D. Cano-Ott, C. Carrapico, F. Cerutti, E. Chiaveri, M. Chin, N. Colonna, G. Corte, M. A. Cortes-Giraldo, M. Diakaki, C. Domingo-Pardo, I. Duran, R. Dressler, N. Dzysiuk, C. Eleftheriadi, A. Ferrari, K. Fraval, S. Ganesan, A. R. Garcia, G. Giubrone, M. B. Gomez-Hornillo, I. F. Goncalve, E. Gonzalez-Romero, F. Gunsing, P. Gurusamy, A. Hernandez-Prieto, D. G. Jenkin, E. Jericha, Y. Kadi, F. Kappeler, D. Karadimo, N. Kivel, P. Koehler, M. Kokkori, M. Krticka, J. Kroll, C. Lampoudi, C. Langer, E. Leal-Cidoncha, C. Lederer, H. Leeb, L. S. Leong, R. Losito, A. Mallick, A. Manouso, J. Marganiec, T. Martinez, C. Massimi, P. F. Mastinu, M. Mastromarco, M. Meaze, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, M. Mirea, W. Mondalaer, C. Paradela, A. Pavlik, J. Perkowski, A. Plompen, J. Praena, J. M. Quesada, T. Rauscher, R. Reifarth, A. Riego, M. S. Roble, F. Roman, C. Rubbia, M. Sabate-Gilarte, R. Sarmento, A. Saxena, P. Schillebeeckx, S. Schmidt, D. Schumann, G. Tagliente, J. L. Tain, D. Tarrio, L. Tassan-Got, A. Tsingani, S. Valenta, G. Vannini, V. Variale, P. Vaz, A. Ventura, R. Versaci, M. J. Vermeulen, V. Vlachoudi, R. Vlastou, A. Wallner, T. Ware, M. Weigand, T. Wright, and P. Zugec

Subjects
Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Energies [Àrees temàtiques de la UPC], Analytical chemistry, Chemical vapor deposition, 7. Clean energy, 01 natural sciences, CVD diamond detectors, Chemical reactions, n_TOF, Detectors and Experimental Techniques, Energy resolution, Nuclear Experiment, Instrumentation, Physics, sCVD diamond detectors, (n, α) Cross-section measurements, Large Hadron Collider, ntof, Detector, Resolution (electron density), Austria, Sponsored this work, Vienna, Nuclear Detector, Enginyeria química::Química física [Àrees temàtiques de la UPC], Nuclear and High Energy Physics, Cross-section measurements, Nanotechnology, engineering.material, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Reaccions químiques, Cross section (physics), 0103 physical sciences, (n,α) Cross-section measurement, Neutron, 010306 general physics, Diode, Energies::Energia nuclear [Àrees temàtiques de la UPC], CIVIDEC Instrumentation GmbH, 010308 nuclear & particles physics, (n,α) Cross-section measurements, n-TOF, neutrons, Diamond, (n, α) cross-section measurements, engineering, High Energy Physics::Experiment, diamond detector
Abstract

At the n\_TOF experiment at CERN a dedicated single-crystal chemical vapor deposition (sCVD) Diamond Mosaic-Detector has been developed for (n,$\alpha$) cross-section measurements. The detector, characterized by an excellent time and energy resolution, consists of an array of 9 sCVD diamond diodes. The detector has been characterized and a cross-section measurement has been performed for the $^{59}$Ni(n,$\alpha$)$^{56}$Fe reaction in 2012. The characteristics of the detector, its performance and the promising preliminary results of the experiment are presented., Comment: Conference proceedings of the Vienna Conference on Instrumentation 2013

Published
2013
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7. The neutron time-of-flight facility n-TOF at CERN: Phase II

Author

Gunsing, F., Andriamonje, S., Andrzejewski, J., Cortés Giraldo, Miguel Antonio, Praena Rodríguez, Javier, Quesada Molina, José Manuel, Weiß, C., and Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear

Subjects
Neutron induced reactions, Neutrons, n-TOF, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, CERN, Physics::Accelerator Physics, Neutron time-of-flight facility, Nuclear Experiment
Abstract

Neutron-induced reactions are studied at the neutron time-of-flight facility n-TOF at CERN. The facility uses 6∼ns wide pulses of 20 GeV/c protons impinging on a lead spallation target. The large neutron energy range and the high instantaneous neutron flux combined with high resolution are among the key characteristics of the facility. After a first phase of data taking during the period 2001-2004, the facility has been refurbished with an upgraded spallation target and cooling system for a second phase of data taking which started in 2009. Since 2010, the experimental area at 185 m where the neutron beam arrives, has been modified into a worksector of type A, allowing the extension of the physics program to include neutron-induced reactions on radioactive isotopes.

Published
2011

8. Measurement of the neutron-induced fission cross-section of Am-243 relative to U-235 from 0.5 to 20 MeV

Author

Belloni, F., Calviani, M., Colonna, N., Mastinu, P., Milazzo, P. M., Abbondanno, U., Aerts, G., Alvarez, H., Alvarez-Velarde, F., Andriamonje, S., Andrzejewski, J., Audouin, L., Badurek, G., Barbagallo, M., Baumann, P., Becvar, F., Berthoumieux, E., Calvino, F., Cano-Ott, D., Capote, R., Carrapico, C., Cennini, P., Chepel, V., Chiaveri, E., Cortes, G., Couture, A., Cox, J., Dahlfors, M., David, S., Dillmann, I., Domingo-Pardo, C., Dridi, W., Duran, I., Eleftheriadis, C., Embid-Segura, M., Ferrari, A., Ferreira-Marques, R., Fujii, K., Furman, W., Goncalves, I., Gonzalez-Romero, E., Goverdovski, A., Gramegna, F., Guerrero, C., Gunsing, F., Haas, B., Haight, R., Heil, M., Herrera-Martinez, A., Igashira, M., Jericha, E., Kappeler, F., Kadi, Y., Karadimos, D., Karamanis, D., Kerveno, M., Koehler, P., Kossionides, E., Krticka, M., Lamboudis, C., Leeb, H., Lindote, A., Lopes, I., Lozano, M., Lukic, S., Marganiec, J., Marrone, S., Martinez, T., Massimi, C., Meaze, M. H., Mengoni, A., Moreau, C., Mosconi, M., Neves, F., Oberhummer, H., O'Brien, S., Pancin, J., Papachristodoulou, C., Papadopoulos, C., Paradela, C., Patronis, N., Pavlik, A., Pavlopoulos, P., Perrot, L., Pigni, M. T., Plag, R., Plompen, A., Plukis, A., Poch, A., Praena, J., Pretel, C., Quesada, J., Rauscher, T., Reifarth, R., Rosetti, M., Rubbia, C., Rudolf, G., Rullhusen, P., Salgado, J., Santos, C., Sarchiapone, L., Savvidis, I., Stephan, C., Tagliente, G., Tain, J. L., Tarrio, D., Tassan-Got, L., Tavora, L., Terlizzi, R., Vannini, G., Vaz, P., Ventura, A., Villamarin, D., Vincente, M. C., Vlachoudis, V., Vlastou, R., Voss, F., Walter, S., Wiescher, M., and Wisshak, K.

Subjects
n-tof, nuclear-science, standards, cern, library, energy-range, system
Abstract

The ratio of the neutron-induced fission cross-sections of Am-243 and U-235 was measured in the energy range from 0.5 to 20 MeV with uncertainties of approximate to 4%. The experiment was performed at the CERN n_TOF facility using a fast ionization chamber. With the good counting statistics that could be achieved thanks to the high instantaneous flux and the low backgrounds, the present results are useful for resolving discrepancies in previous data sets and are important for future reactors with improved fuel burn-up. European Physical Journal A

Published
2011

9. Neutron capture on Zr-94: Resonance parameters and Maxwellian-averaged cross sections

Author

Tagliente, G., Milazzo, P. M., Fujii, K., Abbondanno, U., Aerts, G., Alvarez, H., Alvarez-Velarde, F., Andriamonje, S., Andrzejewski, J., Audouin, L., Badurek, G., Baumann, P., Becvar, F., Belloni, F., Berthoumieux, E., Bisterzo, S., Calvino, F., Calviani, M., Cano-Ott, D., Capote, R., Carrapico, 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., Duran, I., Eleftheriadis, C., Embid-Segura, M., Ferrari, A., Ferreira-Marques, R., Furman, W., Gallino, R., Goncalves, I., Gonzalez-Romero, E., Gramegna, F., Guerrero, C., Gunsing, F., Haas, B., Haight, R., Heil, M., Herrera-Martinez, A., Jericha, E., Kappeler, F., Kadi, Y., Karadimos, D., Karamanis, D., Kerveno, M., Kossionides, E., Krticka, M., Lamboudis, C., Leeb, H., Lindote, A., Lopes, I., Lozano, M., Lukic, S., Marganiec, J., Marrone, S., Martinez, T., Massimi, C., Mastinu, P., Mengoni, A., Moreau, C., Mosconi, M., Neves, F., Oberhummer, H., O'Brien, S., Pancin, J., Papachristodoulou, C., Papadopoulos, C., Paradela, C., Patronis, N., Pavlik, A., Pavlopoulos, P., Perrot, L., Pigni, M. T., Plag, R., Plompen, A., Plukis, A., Poch, A., Praena, J., Pretel, C., Quesada, J., Rauscher, T., Reifarth, R., Rosetti, M., Rubbia, C., Rudolf, G., Rullhusen, P., Salgado, J., Santos, C., Sarchiapone, L., Savvidis, I., Stephan, C., Tain, J. L., Tassan-Got, L., Tavora, L., Terlizzi, R., Vannini, G., Vaz, P., Ventura, A., Villamarin, D., Vincente, M. C., Vlachoudis, V., Vlastou, R., Voss, F., Walter, S., Wiescher, M., and Wisshak, K.

Subjects
nuclear-data library, n-tof, elements, facility, evolution, nucleosynthesis, zirconium, giant branch stars, system, s-process
Abstract

The neutron capture cross sections of the Zr isotopes play an important role in nucleosynthesis studies. The s-process reaction flow between the Fe seed and the heavier isotopes passes through the neutron magic nucleus Zr-90 and through Zr-91,Zr-92,Zr-93,Zr-94, but only part of the flow extends to Zr-96 because of the branching point at Zr-95. Apart from their effect on the s-process flow, the comparably small isotopic (n, gamma) cross sections make Zr also an interesting structural material for nuclear reactors. The Zr-94 (n, gamma) cross section has been measured with high resolution at the spallation neutron source n_TOF at CERN and resonance parameters are reported up to 60 keV neutron energy. Physical Review C

Published
2011

10. The (92)Zr(n,gamma) reaction and its implications for stellar nucleosynthesis

Author

Tagliente, G., Milazzo, P. M., Fujii, K., Abbondanno, U., Aerts, G., Alvarez, H., Alvarez-Velarde, F., Andriamonje, S., Andrzejewski, J., Audouin, L., Badurek, G., Baumann, P., Becvar, F., Belloni, F., Berthoumieux, E., Bisterzo, S., Calvino, F., Calviani, M., Cano-Ott, D., Capote, R., Carrapico, 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., Duran, I., Eleftheriadis, C., Embid-Segura, M., Ferrari, A., Ferreira-Marques, R., Furman, W., Gallino, R., Goncalves, I., Gonzalez-Romero, E., Gramegna, F., Guerrero, C., Gunsing, F., Haas, B., Haight, R., Heil, M., Herrera-Martinez, A., Igashira, M., Jericha, E., Kappeler, F., Kadi, Y., Karadimos, D., Karamanis, D., Kerveno, M., Kossionides, E., Krticka, M., Lamboudis, C., Leeb, H., Lindote, A., Lopes, I., Lozano, M., Lukic, S., Marganiec, J., Marrone, S., Martinez, T., Massimi, C., Mastinu, P., Mengoni, A., Moreau, C., Mosconi, M., Neves, F., Oberhummer, H., O'Brien, S., Pancin, J., Papachristodoulou, C., Papadopoulos, C., Paradela, C., Patronis, N., Pavlik, A., Pavlopoulos, P., Perrot, L., Pigni, M. T., Plag, R., Plompen, A., Plukis, A., Poch, A., Praena, J., Pretel, C., Quesada, J., Rauscher, T., Reifarth, R., Rosetti, M., Rubbia, C., Rudolf, G., Rullhusen, P., Salgado, J., Santos, C., Sarchiapone, L., Savvidis, I., Stephan, C., Tain, J. L., Tassan-Got, L., Tavora, L., Terlizzi, R., Vannini, G., Vaz, P., Ventura, A., Villamarin, D., Vincente, M. C., Vlachoudis, V., Vlastou, R., Voss, F., Walter, S., Wendler, H., Wiescher, M., Wisshak, K., and N TOF Collaboration

Subjects
n-tof, elements, zr isotopes, facility, energy range, cern, capture cross-sections, giant branch stars, neutron-capture, s-process
Abstract

Because the relatively small neutron capture cross sections of the zirconium isotopes are difficult to measure, the results of previous measurements are often not adequate for a number of problems in astrophysics and nuclear technology. Therefore, the (92)Zr(n,gamma) cross section has been remeasured at the CERN n_TOF facility, providing a set of improved parameters for 44 resonances in the neutron energy range up to 40 keV. With this information the cross-section uncertainties in the keV region could be reduced to 5% as required for s-process nucleosynthesis studies and technological applications. Physical Review C

Published
2010

11. Experimental study of the 91Zr(n gamma) reaction up to 26 keV

Author

Tagliente, G, Milazzo, P M, Fujii, K, Aerts, G, Abbondanno, U, Alvarez, H, Alvarez-Velarde, F, Andriamonje, Samuel A, Andrzejewski, J, Assimakopoulos, Panayiotis, Audouin, L, Badurek, G, Baumann, P, Becvár, F, Belloni, F, Berthoumieux, E, Calviño, F, Calviani, M, Cano-Ott, D, Capote, R, Carrapiço, C, Cennini, P, Chepel, V, Colonna, N, Cortés, G, Couture, A, Cox, J, Dahlfors, M, David, S, Dillmann, I, Domingo-Pardo, C, Dridi, W, Durán, I, Eleftheriadis, C, Embid-Segura, M, Ferrant, L, Ferrari, A, Ferreira-Marques, R, Furman, W, Gonçalves, I, Gonzalez-Romero, E, Gramegna, F, Guerrero, C, Gunsing, F, Haas, B, Haight, R, Heil, M, Herrera-Martínez, A, Igashira, M, Jericha, E, Kappeler, F, Kadi, Y, Karadimos, D, Karamanis, D, Kerveno, M, Köhler, P, Kossionides, E, Krticka, M, Lamboudis, C, Leeb, H, Lindote, A, Lopes, I, Lozano, M, Lukic, S, Marganiec, J, Marrone, S, Martínez, T, Massimi, C, Mastinu, P, Mengoni, A, Moreau, C, Mosconi, M, Neves, F, Oberhummer, H, O'Brien, S, Pancin, J, Papachristodoulou, C, Papadopoulos, C, Paradela, C, Patronis, N, Pavlik, A, Pavlopoulos, P, Perrot, L, Pigni, M T, Plag, R, Plompen, A, Plukis, A, Poch, A, Praena-Rodriguez, J, Pretel, C, Quesada, J, Rauscher, T, Reifarth, R, Rubbia, C, Rudolf, G, Rullhusen, P, Salgado, J, Santos, C, Sarchiapone, L, Savvidis, I, Stéphan, C, Taín, J L, Tassan-Got, L, Tavora, L, Terlizzi, R, Vannini, G, Vaz, P, Ventura, A, Villamarín, D, Vincente, M C, Vlachoudis, V, Vlastou, R, Voss, F, Walter, S, Wiescher, M, Wisshak, K, Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Laboratori Nazionali di Legnaro (LNL), Istituto Nazionale di Fisica Nucleare (INFN), European Organization for Nuclear Research (CERN), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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), Istituto Nazionale di Fisica Nucleare, Sezione di Bologna (INFN, Sezione di Bologna), nTOF, 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), 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), and National Institute for Nuclear Physics (INFN)

Subjects
statistical-model, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, cern, transmission, nucleosynthesis, capture cross-sections, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 25.40.Lw, 25.70.Ef, 27.60.+j, 97.10.Cv, n-tof, evolution, Nuclear Physics - Experiment, giant branch stars, Nuclear Experiment, neutron-capture, s-process
Abstract

The neutron capture cross sections of the Zr isotopes are relevant to studies in nuclear structure, nuclear astrophysics, and nuclear technology. The valence neutron of (91)Zr with respect to the neutron magic nucleus (90)Zr has interesting implications for the statistical analysis in the proximity of shell closures. In stellar nucleosynthesis, the Zr isotopes are important for the s-process reaction flow between the Fe seeds and the heavier isotopes. Because of its relatively small (n, gamma) cross sections, Zr represents also an interesting structural material for nuclear reactors. For the same reason, these cross sections are difficult to measure and reliable data are sparse. Therefore, the (n, gamma) cross sections of the Zr isotopes have been remeasured at the CERN n_TOF facility. Thanks to its high instantaneous flux, good energy resolution, and low background, this facility is particularly suited for the determination of small, resonance-dominated cross sections. In this work, results for the (91)Zr(n, gamma) (92)Zr reaction are reported in the neutron energy range from thermal to 26 keV. In this region, accurate data of 157 resonances could be obtained, 33 of these resonances are not present in the main databases and/or were observed for the first time. Physical Review C

Published
2008
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12. Neutron capture cross section of 90Zr: Bottleneck in the s-process reaction flow

Author

Tagliente, G., Fujii, K., Milazzo, P.M., Moreau, C., Aerts, G., Abbondanno, U., Álvarez, H., Alvarez-Velarde, F., Andriamonje, S., Andrzejewski, J., Assimakopoulos, P., Audouin, L., Badurek, G., Baumann, P., Bečvá&#345, F., Berthoumieux, E., Bisterzo, S., 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., Dillman, I., Domingo-Pardo, C., Dridi, W., Duran, I., Eleftheriadis, C., Embid-Segura, M., Ferrant, L., Ferrari, Anthony, Ferreira-Marques, R., Furman, W., Gallino, R., Goncalves, I., Gonzalez-Romero, E., Gramegna, F., Guerrero, C., Gunsing, F., Haas, B., Haight, R., Heil, M., Herrera-Martinez, A., Igashira, M., Jericha, E., Käppeler, F., Kadi, Y., Karadimos, D., Karamanis, D., Kerveno, M., Koehler, P., Kossionides, E., Krtička, M., Lamboudis, C., Leeb, H., Lindote, A., Lopes, I., Lozano, M., Lukic, S., Marganiec, J., Marrone, S., Martínez, T., Massimi, C., Mastinu, P., Mengoni, A., Mosconi, M., Neves, F., Oberhummer, H., O'Brien, S., Pancin, J., Papachristodoulou, C., Papadopoulos, C., Paradela, C., Patronis, N., Pavlik, A., Pavlopoulos, P., Perrot, L., T. Pigni, M., Plag, R., Plompen, A., Plukis, A., Poch, A., Praena, J., Pretel, C., Quesada, J., Rauscher, T., Reifarth, R., Rubbia, C., Rudolf, G., Rullhusen, P., Salgado, J., Santos, C., Sarchiapone, L., Savvidis, I., Stephan, C., Tain, J.L., Tassan-Got, L., Tavora, L., Terlizzi, R., Vannini, G., Vaz, P., Ventura, A., Villamarin, D., Vincente, M.C., Vlachoudis, V., Vlastou, R., Voss, F., Walter, S., Wendler, H., Wiescher, M., Wisshak, K., Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-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), 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), Pole Universitaire Leonard 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), and Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
zr isotopes, facility, Astrophysics::High Energy Astrophysical Phenomena, nucleosynthesis, valence component, system, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 25.40.Lw, 25.70.Ef, 27.60.+j, 97.10.Cv, n-tof, massive stars, energy range, evolution, Nuclear Physics - Experiment, giant branch stars, Nuclear Experiment
Abstract

The neutron capture cross sections of the Zr isotopes have important implications in nuclear astrophysics and for reactor design. The small cross section of the neutron magic nucleus (90)Zr, which accounts for more than 50% of natural zirconium represents one of the key isotopes for the stellar s-process, because it acts as a bottleneck in the neutron capture chain between the Fe seed and the heavier isotopes. The same element, Zr, also is an important component of the structural materials used in traditional and advanced nuclear reactors. The (n, gamma) cross section has been measured at CERN, using the n_TOF spallation neutron source. In total, 45 resonances could be resolved in the neutron energy range below 70 keV, 10 being observed for the first time thanks to the high resolution and low backgrounds at n_TOF. On average, the Gamma(gamma) widths obtained in resonance analyses with the R-matrix code SAMMY were 15% smaller than reported previously. By these results, the accuracy of the Maxwellian averaged cross section for s-process calculations has been improved by more than a factor of 2. Physical Review C

Published
2008
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13. The La-139(n,gamma) cross section: Key for the onset of the s-process

Author

Terlizzi, R., Abbondanno, U., Aerts, G., Alvarez, H., Alvarez-Velarde, H., Alvarez-Velarde, F., Andriamonje, S., Andrzejewski, J., Assimakopoulos, P., Audouin, L., Badurek, G., Baumann, P., Becvar, F., Berthoumieux, E., Calviani, M., Calvino, F., Cano-Ott, D., Capote, R., de Albornoz, A. C., Cennini, P., Chepel, V., Chiaveri, E., Colonna, N., Cortes, G., Couture, A., Cox, J., Dahlfors, M., David, S., Dillmann, I., Dolfini, R., Domingo-Pardo, C., Dridi, W., Duran, I., Eleftheriadis, C., Embid-Segura, M., Ferrant, L., Ferrari, A., Ferreira-Marques, R., Fitzpatrick, L., Frais-Koelbl, H., Fujii, K., Furman, W., Gallino, R., Goncalves, I., Gonzalez-Romero, E., Goverdovski, A., Gramegna, F., Griesmayer, E., Guerrero, C., Gunsing, F., Haas, B., Haight, R., Heil, M., Herrera-Martinez, A., Igashira, M., Isaev, S., Jericha, E., Kadi, Y., Kappeler, F., Karamanis, D., Karadimos, D., Kerveno, M., Ketlerov, V., Koehler, P., Konovalov, V., Kossionides, E., Krticka, M., Lamboudis, C., Leeb, H., Lindote, A., Lopes, I., Lozano, M., Lukic, S., Marganiec, J., Marques, L., Marrone, S., Massimi, C., Mastinu, P., Mengoni, A., Milazzo, P. M., Moreau, C., Mosconi, M., Neves, F., Oberhummer, H., O'Brien, S., Pancin, J., Papachristodoulou, C., Papadopoulos, C., Paradela, C., Patronis, N., Pavlik, A., Pavlopoulos, P., Perrot, L., Pignatari, M., Plag, R., Plompen, A., Plukis, A., Poch, A., Pretel, C., Quesada, J., Rauscher, T., Reifarth, R., Rosetti, M., Rubbia, C., Rudolf, G., Rullhusen, P., Salgado, J., Sarchiapone, L., Savvidis, I., Stephan, C., Tagliente, G., Tain, J. L., Tassan-Got, L., Tavora, L., Vannini, G., Vaz, P., Ventura, A., Villamarin, D., Vincente, M. C., Vlachoudis, V., Vlastou, R., Voss, F., Walter, S., Wendler, H., Wiescher, M., and Wisshak, K.

Subjects
resonance spectroscopy, n-tof, dispersion spectrograph, process nucleosynthesis, neutron-capture elements, cool dwarf stars, r-process elements, metal-poor stars, giant branch stars, galactic chemical evolution
Abstract

The nuclear resonance parameters and the capture cross section of the neutron magic isotope La-139 have been measured relative to Au-197 in the energy range of 0.6 eV to 9 keV at the neutron time-of-flight (n_TOF) facility at CERN. We describe the experimental apparatus and the data analysis procedures, which concerned mainly the efficiency correction by means of the pulse height weighting function technique and the determination of different background components. We extracted the resonance parameters and the main nuclear quantities such as the resonance integral RI=10.8 +/- 1.0b, the average gamma widths for s and p waves (l=0)=50.7 +/- 5.4 meV and (l=1)=33.6 +/- 6.9 meV, the nuclear level densities < D >(l=0)=252 +/- 22 eV and < D >(l=1)< 250 eV, and the neutron strength functions S-0=(0.82 +/- 0.05)x10(-4) and S-1=(0.55 +/- 0.04)x10(-4). These results represent a significant improvement over previous data. The deduced Maxwellian-averaged capture cross sections are important for the interpretation of the most recent spectroscopic observations in low-metallicity stars. ispartof: Physical Review. C, Nuclear physics vol:75 issue:3 pages:1-15 status: published

Published
2007

14. Status and outlook of the neutron time-of-flight facility

Author

Gunsing, F., Abbondanno, U., Aerts, G., Alvarez, H., Alvarez-Velarde, F., Andriamonje, S., Andrzejewski, J., Assimakopoulos, P., Audouin, L., Badurek, G., Baumann, P., Becvar, F., Berthoumieux, E., Calvino, F., Cano-Ott, D., Capote, R., de Albornoz, A. C., Cennini, P., Chepel, V., Chiaveri, E., Colonna, N., Cortes, G., Couture, A., Cox, J., Dahlfors, M., David, S., Dillman, I., Dolfini, R., Domingo-Pardo, C., Dridi, W., Duran, I., Eleftheriadis, C., Ferrant, L., Ferrari, A., Ferreira-Marques, R., Frais-Koelbl, H., Fujii, K., Furman, W., Goncalves, I., Gonzalez-Romero, E., Goverdovski, A., Gramegna, F., Griesmayer, E., Guerrero, C., Haas, B., Haight, R., Heil, M., Herrera-Martinez, A., Igashira, M., Isaev, S., Jericha, E., Kappeler, F., Kadi, Y., Karadimos, D., Karamanis, D., Kerveno, M., Ketlerov, V., Koehler, P., Konovalov, V., Kossionides, E., Krticka, M., Lampoudis, C., Leeb, H., Lindote, A., Lopes, I., Lozano, M., Lukic, S., Marganiec, J., Marques, L., Marrone, S., Martinez, T., Massimi, C., Mastinu, P., Mengoni, A., Milazzo, P. M., Moreau, C., Mosconi, M., Neves, F., Oberhummer, H., O'Brien, S., Oshima, M., Pancin, J., Papachristodoulou, C., Papadopoulos, C., Paradela, C., Patronis, N., Pavlik, A., Pavlopoulos, P., Perrot, L., Pigni, M. T., Plag, R., Plompen, A., Plukis, A., Poch, A., Pretel, C., Quesada, J., Rauscher, T., Reifarth, R., Rosetti, M., Rubbia, C., Rudolf, G., Rullhusen, P., Salgado, J., Sarchiapone, L., Savvidis, I., Stephan, C., Tagliente, G., Tain, J. L., Tassan-Got, L., Tavora, L., Terlizzi, R., Vannini, G., Vaz, P., Ventura, A., Villamarin, D., Vincente, M. C., Vlachoudis, V., Vlastou, R., Voss, F., Walter, S., Wendler, H., Wiescher, M., and Wisshak, K.

Subjects
n-tof, elements, detector, neutrons, cern, n_tof, beam, time-of-flight, capture, spallation
Abstract

The neutron time-of-flight facility n_TOF at CERN, fully operational since 2002, combines a high instantaneous neutron flux with high energy resolution. The wide energy range and the high neutron flux per time-of-flight burst result in a much enhanced signal to background ratio for neutron capture of radioactive isotopes and makes this facility well suited for the measurement of high quality neutron-induced reaction cross-sections. Neutrons are created by spallation reactions induced by a pulsed 20 GeV/c proton beam impinging on a lead target. A 5 cm water slab surrounding the lead target serves as a coolant and at the same time as a moderator of the spallation neutron spectrum, providing a wide energy spectrum from 0.1 eV to about 250 MeV. By the end of 2005, a first phase of data taking has been successfully terminated. Fission and capture experiments have been performed on a variety of isotopes of interest for nuclear astrophysics, advanced nuclear technologies and for basic nuclear physics. The instrumentation developed for this facility consists of parallel plate avalanche counter and fission ionization chamber detectors for the fission experiments and of low mass C6D6 detectors and a 4 pi BaF2 total absorption calorimeter for capture experiments. A new data acquisition system, based on sampling of the detector signals, has been developed to cope with the high count rates and to minimize the effective dead time to only a few tens of nanosecond. A second phase of data taking is planned to start in 2007, after an upgrade of the spallation target. On the longer term, the construction of a flight path at 20 in resulting in an increased neutron flux of about a factor of 100 opens new possibilities. (c) 2007 Elsevier B.V. All rights reserved. Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms

Published
2007

15. The neutron time-of-flight facility n-TOF at CERN: Phase II

Author

Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Gunsing, F., Andriamonje, S., Andrzejewski, J., Cortés Giraldo, Miguel Antonio, Praena Rodríguez, Javier, Quesada Molina, José Manuel, Weiß, C., Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Gunsing, F., Andriamonje, S., Andrzejewski, J., Cortés Giraldo, Miguel Antonio, Praena Rodríguez, Javier, Quesada Molina, José Manuel, and Weiß, C.

Abstract

Neutron-induced reactions are studied at the neutron time-of-flight facility n-TOF at CERN. The facility uses 6∼ns wide pulses of 20 GeV/c protons impinging on a lead spallation target. The large neutron energy range and the high instantaneous neutron flux combined with high resolution are among the key characteristics of the facility. After a first phase of data taking during the period 2001-2004, the facility has been refurbished with an upgraded spallation target and cooling system for a second phase of data taking which started in 2009. Since 2010, the experimental area at 185 m where the neutron beam arrives, has been modified into a worksector of type A, allowing the extension of the physics program to include neutron-induced reactions on radioactive isotopes.

Published
2011

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