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

Author

International Conference on Nuclear Data for Science and Technology (2016 : Bruges), Leal Cidoncha, Esther, Durán, Ignacio, Paradela Dobarro, Carlos, Tassan-Got, Laurent, Audouin, Laurent, Leal, Luiz C., Le Naour, Claire, Noguere, Gilles, Tarrío Vilas, Diego, Leong, Lou Sai, Altstadt, Sebastian, Andrzejewski, Józef, Barbagallo, Massimo, Bécares, Vicente, Bečvář, František, Belloni, Fabio, Berthoumieux, Eric, Billowes, Jonathan, Boccone, Vittorio, Bosnar, Damir, Brugger, Markus, Calviani, Marco, Calviño Tavares, Francisco, Cano-Ott, Daniel, Carrapiço, Carlos, Cerutti, Francesco, Chiaveri, Enrico, Chin, Michael, Colonna, Nicola, Cortés Rossell, Guillem Pere, Cortés-Giraldo, Miguel Antonio, Diakaki, Maria, Domingo-Pardo, César, Dressler, Rugard, Eleftheriadis, Christos, Ferrari, Alfredo, Fraval, Kevin, Ganesan, Srinivasan, García Ríos, Aczel Regino, Giubrone, Giuseppe, Gómez Hornillos, María Belén, Gonçalves, Isabel Maria Ferro, González Romero, Enrique Miguel, Griesmayer, Erich, Guerrero Sánchez, Carlos, Gunsing, Frank, Gurusamy, Perumal, Hernández Prieto, Álvaro, Jenkins, David, Jericha, Erwin, Kadi, Yacine, Käppeler, Franz, Karadimos, Dimitri, Kivel, Nikolay, Kokkoris, Michael, Krtička, Milan, Kroll, Jiří, Lampoudis, Christos, Langer, Christoph, Lederer, Claudia, Leeb, Helmut, Losito, Roberto, Mallick, Amod Kishore, Manousos, Athanasios, Marganiec, Justyna, Martı́nez, Trinitario, Massimi, Cristian, Mastinu, Pierfrancesco, Mastromarco, Mario, Meaze, AKM Moinul Haque, Mendoza Cembranos, Emilio, Mengoni, Alberto, Milazzo, Paolo Maria, Mingrone, Federica, Mirea, Mihail, Mondelaers, Willy, Pavlik, Andreas, Perkowski, Jarosław, Plompen, Arjan J. M., Praena, Javier, Quesada Molina, José Manuel, Rauscher, Thomas, Reifarth, René, Riego Pérez, Albert, Robles Manzano, Maria Soledad, Roman, Faustin Laurenţiu, Rubbia, Carlo, Sabaté-Gilarte, Marta, Sarmento, Raul, Saxena, Alok, Schillebeeckx, Peter, Schmidt, Stefan, Schumann, Dorothea, Tagliente, Giuseppe, Taı́n Enríquez, José Luis, Tsinganis, Andrea, Valenta, Stanislav, Vannini, Gianni, Variale, Vincenzo, Vaz, Pedro, Ventura, Alberto, Versaci, Roberto, Vermeulen, Mark J., Vlachoudis, Vasilis, Vlastou, Rosa, Wallner, Anton, Ware, Timothy, Weigand, Mario, Weiß, Christina, Wright, Tobias, Žugec, Petar, International Conference on Nuclear Data for Science and Technology (2016 : Bruges), Leal Cidoncha, Esther, Durán, Ignacio, Paradela Dobarro, Carlos, Tassan-Got, Laurent, Audouin, Laurent, Leal, Luiz C., Le Naour, Claire, Noguere, Gilles, Tarrío Vilas, Diego, Leong, Lou Sai, Altstadt, Sebastian, Andrzejewski, Józef, Barbagallo, Massimo, Bécares, Vicente, Bečvář, František, Belloni, Fabio, Berthoumieux, Eric, Billowes, Jonathan, Boccone, Vittorio, Bosnar, Damir, Brugger, Markus, Calviani, Marco, Calviño Tavares, Francisco, Cano-Ott, Daniel, Carrapiço, Carlos, Cerutti, Francesco, Chiaveri, Enrico, Chin, Michael, Colonna, Nicola, Cortés Rossell, Guillem Pere, Cortés-Giraldo, Miguel Antonio, Diakaki, Maria, Domingo-Pardo, César, Dressler, Rugard, Eleftheriadis, Christos, Ferrari, Alfredo, Fraval, Kevin, Ganesan, Srinivasan, García Ríos, Aczel Regino, Giubrone, Giuseppe, Gómez Hornillos, María Belén, Gonçalves, Isabel Maria Ferro, González Romero, Enrique Miguel, Griesmayer, Erich, Guerrero Sánchez, Carlos, Gunsing, Frank, Gurusamy, Perumal, Hernández Prieto, Álvaro, Jenkins, David, Jericha, Erwin, Kadi, Yacine, Käppeler, Franz, Karadimos, Dimitri, Kivel, Nikolay, Kokkoris, Michael, Krtička, Milan, Kroll, Jiří, Lampoudis, Christos, Langer, Christoph, Lederer, Claudia, Leeb, Helmut, Losito, Roberto, Mallick, Amod Kishore, Manousos, Athanasios, Marganiec, Justyna, Martı́nez, Trinitario, Massimi, Cristian, Mastinu, Pierfrancesco, Mastromarco, Mario, Meaze, AKM Moinul Haque, Mendoza Cembranos, Emilio, Mengoni, Alberto, Milazzo, Paolo Maria, Mingrone, Federica, Mirea, Mihail, Mondelaers, Willy, Pavlik, Andreas, Perkowski, Jarosław, Plompen, Arjan J. M., Praena, Javier, Quesada Molina, José Manuel, Rauscher, Thomas, Reifarth, René, Riego Pérez, Albert, Robles Manzano, Maria Soledad, Roman, Faustin Laurenţiu, Rubbia, Carlo, Sabaté-Gilarte, Marta, Sarmento, Raul, Saxena, Alok, Schillebeeckx, Peter, Schmidt, Stefan, Schumann, Dorothea, Tagliente, Giuseppe, Taı́n Enríquez, José Luis, Tsinganis, Andrea, Valenta, Stanislav, Vannini, Gianni, Variale, Vincenzo, Vaz, Pedro, Ventura, Alberto, Versaci, Roberto, Vermeulen, Mark J., Vlachoudis, Vasilis, Vlastou, Rosa, Wallner, Anton, Ware, Timothy, Weigand, Mario, Weiß, Christina, Wright, Tobias, and Žugec, Petar

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.

Published
2017

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

Author

International Conference on Nuclear Data for Science and Technology (2016 : Bruges), Balibrea Correa, Javier, Mendoza Cembranos, Emilio, Cano-Ott, Daniel, Krtička, Milan, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Laurent, Bécares, Vicente, Barbagallo, Massimo, Bečvář, František, Belloni, Fabio, Berthoumieux, Eric, Billowes, Jonathan, Boccone, Vittorio, Bosnar, Damir, Brugger, Markus, Calviño Tavares, Francisco, Calviani, Marco, Carrapiço, Carlos, Cerutti, Francesco, Chiaveri, Enrico, Chin, Michael, Colonna, Nicola, Cortés Rossell, Guillem Pere, Cortés-Giraldo, Miguel Antonio, Diakaki, Maria, Domingo-Pardo, César, Dressler, Rugard, Durán, Ignacio, Eleftheriadis, Christos, Ferrari, Alfredo, Fraval, Kevin, Furman, Valter, Göbel, Kathrin, Guerrero Sánchez, Carlos, Gómez Hornillos, María Belén, Ganesan, Srinivasan, García Ríos, Aczel Regino, Giubrone, Giuseppe, Gonçalves, Isabel Maria Ferro, González Romero, Enrique Miguel, Goverdovski, Andrey, Griesmayer, Erich, Gunsing, Frank, Heftrich, Tanja, Heinitz, Stephan, Hernández Prieto, Álvaro, Heyse, Jan, Jenkins, David, Jericha, Erwin, Käppeler, Franz, Kadi, Yacine, Karadimos, Dimitri, Katabuchi, Tatsuya, Ketlerov, Vladimir, Khryachkov, Vitaly, Kivel, Nikolay, Koehler, Paul, Kokkoris, Michael, Kroll, Jiří, Lampoudis, Christos, Langer, Christoph, Leal Cidoncha, Esther, Lederer, Claudia, Leeb, Helmut, Leong, Lou Sai, Lerendegui-Marco, Jorge, Licata, Mauro, Losito, Roberto, Mallick, Amod Kishore, Manousos, Athanasios, Marganiec, Justyna, Martı́nez, Trinitario, Massimi, Cristian, Mastinu, Pierfrancesco, Mastromarco, Mario, Mengoni, Alberto, Milazzo, Paolo Maria, Mingrone, Federica, Mirea, Mihail, Mondelaers, Willy, Paradela Dobarro, Carlos, Pavlik, Andreas, Perkowski, Jarosław, Plompen, Arjan J. M., Praena, Javier, Quesada Molina, José Manuel, Rauscher, Thomas, Reifarth, René, Riego Pérez, Albert, Robles Manzano, Maria Soledad, Rubbia, Carlo, Ryan, James A., Sabaté-Gilarte, Marta, Sarmento, Raul, Saxena, Alok, Schillebeeckx, Peter, Schmidt, Stefan, Schumann, Dorothea, Sedyshev, Pavel V., Tagliente, Giuseppe, Taı́n Enríquez, José Luis, Tarifeño-Saldivia, Ariel, Tarrío Vilas, Diego, Tassan-Got, Laurent, Tsinganis, Andrea, Valenta, Stanislav, Vannini, Gianni, Variale, Vincenzo, Vaz, Pedro, Ventura, Alberto, Vermeulen, Mark J., Vlachoudis, Vasilis, Vlastou, Rosa, Wallner, Anton, Ware, Timothy, Weigand, Mario, Weiss, Christian, Wright, Tobias, Žugec, Petar, International Conference on Nuclear Data for Science and Technology (2016 : Bruges), Balibrea Correa, Javier, Mendoza Cembranos, Emilio, Cano-Ott, Daniel, Krtička, Milan, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Laurent, Bécares, Vicente, Barbagallo, Massimo, Bečvář, František, Belloni, Fabio, Berthoumieux, Eric, Billowes, Jonathan, Boccone, Vittorio, Bosnar, Damir, Brugger, Markus, Calviño Tavares, Francisco, Calviani, Marco, Carrapiço, Carlos, Cerutti, Francesco, Chiaveri, Enrico, Chin, Michael, Colonna, Nicola, Cortés Rossell, Guillem Pere, Cortés-Giraldo, Miguel Antonio, Diakaki, Maria, Domingo-Pardo, César, Dressler, Rugard, Durán, Ignacio, Eleftheriadis, Christos, Ferrari, Alfredo, Fraval, Kevin, Furman, Valter, Göbel, Kathrin, Guerrero Sánchez, Carlos, Gómez Hornillos, María Belén, Ganesan, Srinivasan, García Ríos, Aczel Regino, Giubrone, Giuseppe, Gonçalves, Isabel Maria Ferro, González Romero, Enrique Miguel, Goverdovski, Andrey, Griesmayer, Erich, Gunsing, Frank, Heftrich, Tanja, Heinitz, Stephan, Hernández Prieto, Álvaro, Heyse, Jan, Jenkins, David, Jericha, Erwin, Käppeler, Franz, Kadi, Yacine, Karadimos, Dimitri, Katabuchi, Tatsuya, Ketlerov, Vladimir, Khryachkov, Vitaly, Kivel, Nikolay, Koehler, Paul, Kokkoris, Michael, Kroll, Jiří, Lampoudis, Christos, Langer, Christoph, Leal Cidoncha, Esther, Lederer, Claudia, Leeb, Helmut, Leong, Lou Sai, Lerendegui-Marco, Jorge, Licata, Mauro, Losito, Roberto, Mallick, Amod Kishore, Manousos, Athanasios, Marganiec, Justyna, Martı́nez, Trinitario, Massimi, Cristian, Mastinu, Pierfrancesco, Mastromarco, Mario, Mengoni, Alberto, Milazzo, Paolo Maria, Mingrone, Federica, Mirea, Mihail, Mondelaers, Willy, Paradela Dobarro, Carlos, Pavlik, Andreas, Perkowski, Jarosław, Plompen, Arjan J. M., Praena, Javier, Quesada Molina, José Manuel, Rauscher, Thomas, Reifarth, René, Riego Pérez, Albert, Robles Manzano, Maria Soledad, Rubbia, Carlo, Ryan, James A., Sabaté-Gilarte, Marta, Sarmento, Raul, Saxena, Alok, Schillebeeckx, Peter, Schmidt, Stefan, Schumann, Dorothea, Sedyshev, Pavel V., Tagliente, Giuseppe, Taı́n Enríquez, José Luis, Tarifeño-Saldivia, Ariel, Tarrío Vilas, Diego, Tassan-Got, Laurent, Tsinganis, Andrea, Valenta, Stanislav, Vannini, Gianni, Variale, Vincenzo, Vaz, Pedro, Ventura, Alberto, Vermeulen, Mark J., Vlachoudis, Vasilis, Vlastou, Rosa, Wallner, Anton, Ware, Timothy, Weigand, Mario, Weiss, Christian, Wright, Tobias, and Žugec, Petar

Abstract

The accuracy on neutron capture cross section of fissile isotopes must be improved for the design of future nuclear systems such as Gen-IV reactors and Accelerator Driven Systems. The High Priority Request List of the Nuclear Energy Agency, which lists the most important nuclear data requirements, includes also the neutron capture cross sections of fissile isotopes such as 233,235U and 239,241Pu. A specific experimental setup has been used at the CERN n_TOF facility for the measurement of the neutron capture cross section of 235U by a set of micromegas fission detectors placed inside a segmented BaF2 Total Absorption Calorimeter.

Published
2017

3. Calculation of Coincidence Summing Correction Factors for an HPGe detector using GEANT4

Author

Universitat Politècnica de València. Instituto de Seguridad Industrial, Radiofísica y Medioambiental - Institut de Seguretat Industrial, Radiofísica i Mediambiental, Universitat Politècnica de València. Escuela Técnica Superior de Ingenieros Industriales - Escola Tècnica Superior d'Enginyers Industrials, Giubrone, Giuseppe, Ortiz Moragón, Josefina, Gallardo Bermell, Sergio, Martorell Alsina, Sebastián Salvador, Bas Cerdá, María del Carmen, Universitat Politècnica de València. Instituto de Seguridad Industrial, Radiofísica y Medioambiental - Institut de Seguretat Industrial, Radiofísica i Mediambiental, Universitat Politècnica de València. Escuela Técnica Superior de Ingenieros Industriales - Escola Tècnica Superior d'Enginyers Industrials, Giubrone, Giuseppe, Ortiz Moragón, Josefina, Gallardo Bermell, Sergio, Martorell Alsina, Sebastián Salvador, and Bas Cerdá, María del Carmen

Abstract

[EN] The aim of this paper was to calculate the True Coincidence Summing Correction Factors (TSCFs) for an HPGe coaxial detector in order to correct the summing effect as a result of the presence of Y-88 and Co-60 in a multigamma source used to obtain a calibration efficiency curve. Results were obtained for three volumetric sources using the Monte Carlo toolkit, GEANT4. The first part of this paper deals with modeling the detector in order to obtain a simulated full energy peak efficiency curve. A quantitative comparison between the measured and simulated values was made across the entire energy range under study. The True Summing Correction Factors were calculated for Y-88 and Co-60 using the full peak efficiencies obtained with GEANT4. This methodology was subsequently applied to Cs-134, and presented a complex decay scheme.

Published
2016

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

Author

International Workshop on Nuclear Data Evaluation for Reactor Applications (4. : 2015 : Aix-en-Provence), Leal Cidoncha, Esther, Durán, Ignacio, Paradela Dobarro, Carlos, Tarrío Vilas, Diego, Leong, Lou Sai, Tassan-Got, Laurent, Audouin, Laurent, Altstadt, Sebastian, Andrzejewski, Józef, Barbagallo, Massimo, Bécares, Vicente, Bečvář, František, Belloni, Fabio, Berthoumieux, Eric, Billowes, Jonathan, Boccone, Vittorio, Bosnar, Damir, Brugger, Markus, Calviani, Marco, Calviño Tavares, Francisco, Cano-Ott, Daniel, Carrapiço, Carlos, Cerutti, Francesco, Chiaveri, Enrico, Chin, Michael, Colonna, Nicola, Cortés Rossell, Guillem Pere, Cortés-Giraldo, Miguel Antonio, Diakaki, Maria, Domingo-Pardo, César, Dressler, Rugard, Dzysiuk, Nataliia, Eleftheriadis, Christos, Ferrari, Alfredo, Fraval, Kevin, Ganesan, Srinivasan, García Ríos, Aczel Regino, Giubrone, Giuseppe, Gómez Hornillos, María Belén, Gonçalves, Isabel Maria Ferro, González Romero, Enrique Miguel, Griesmayer, Erich, Guerrero Sánchez, Carlos, Gunsing, Frank, Gurusamy, Perumal, Hernández Prieto, Álvaro, Jenkins, David, Jericha, Erwin, Kadi, Yacine, Käppeler, Franz, Karadimos, Dimitri, Kivel, Nikolay, Koehler, Paul, Kokkoris, Michael, Krtička, Milan, Kroll, Jiří, Lampoudis, Christos, Langer, Christoph, Lederer, Claudia, Leeb, Helmut, Lo Meo, Sergio, Losito, Roberto, Mallick, Amod Kishore, Manousos, Athanasios, Marganiec, Justyna, Martı́nez, Trinitario, Massimi, Cristian, Mastinu, Pierfrancesco, Mastromarco, Mario, Meaze, AKM Moinul Haque, Mendoza Cembranos, Emilio, Mengoni, Alberto, Milazzo, Paolo Maria, Mingrone, Federica, Mirea, Mihail, Mondelaers, Willy, Pavlik, Andreas, Perkowski, Jarosław, Plompen, Arjan J. M., Praena, Javier, Quesada Molina, José Manuel, Rauscher, Thomas, Reifarth, René, Riego Pérez, Albert, Robles Manzano, Maria Soledad, Roman, Faustin Laurenţiu, Rubbia, Carlo, Sabaté-Gilarte, Marta, Sarmento, Raul, Saxena, Alok, Schillebeeckx, Peter, Schmidt, Stefan, Schumann, Dorothea, Tagliente, Giuseppe, Taı́n Enríquez, José Luis, Tsinganis, Andrea, Valenta, Stanislav, Vannini, Gianni, Variale, Vincenzo, Vaz, Pedro, Ventura, Alberto, Versaci, Roberto, Vermeulen, Mark J., Vlachoudis, Vasilis, Vlastou, Rosa, Wallner, Anton, Ware, Timothy, Weigand, Mario, Weiß, Christina, Wright, Tobias, Žugec, Petar, International Workshop on Nuclear Data Evaluation for Reactor Applications (4. : 2015 : Aix-en-Provence), Leal Cidoncha, Esther, Durán, Ignacio, Paradela Dobarro, Carlos, Tarrío Vilas, Diego, Leong, Lou Sai, Tassan-Got, Laurent, Audouin, Laurent, Altstadt, Sebastian, Andrzejewski, Józef, Barbagallo, Massimo, Bécares, Vicente, Bečvář, František, Belloni, Fabio, Berthoumieux, Eric, Billowes, Jonathan, Boccone, Vittorio, Bosnar, Damir, Brugger, Markus, Calviani, Marco, Calviño Tavares, Francisco, Cano-Ott, Daniel, Carrapiço, Carlos, Cerutti, Francesco, Chiaveri, Enrico, Chin, Michael, Colonna, Nicola, Cortés Rossell, Guillem Pere, Cortés-Giraldo, Miguel Antonio, Diakaki, Maria, Domingo-Pardo, César, Dressler, Rugard, Dzysiuk, Nataliia, Eleftheriadis, Christos, Ferrari, Alfredo, Fraval, Kevin, Ganesan, Srinivasan, García Ríos, Aczel Regino, Giubrone, Giuseppe, Gómez Hornillos, María Belén, Gonçalves, Isabel Maria Ferro, González Romero, Enrique Miguel, Griesmayer, Erich, Guerrero Sánchez, Carlos, Gunsing, Frank, Gurusamy, Perumal, Hernández Prieto, Álvaro, Jenkins, David, Jericha, Erwin, Kadi, Yacine, Käppeler, Franz, Karadimos, Dimitri, Kivel, Nikolay, Koehler, Paul, Kokkoris, Michael, Krtička, Milan, Kroll, Jiří, Lampoudis, Christos, Langer, Christoph, Lederer, Claudia, Leeb, Helmut, Lo Meo, Sergio, Losito, Roberto, Mallick, Amod Kishore, Manousos, Athanasios, Marganiec, Justyna, Martı́nez, Trinitario, Massimi, Cristian, Mastinu, Pierfrancesco, Mastromarco, Mario, Meaze, AKM Moinul Haque, Mendoza Cembranos, Emilio, Mengoni, Alberto, Milazzo, Paolo Maria, Mingrone, Federica, Mirea, Mihail, Mondelaers, Willy, Pavlik, Andreas, Perkowski, Jarosław, Plompen, Arjan J. M., Praena, Javier, Quesada Molina, José Manuel, Rauscher, Thomas, Reifarth, René, Riego Pérez, Albert, Robles Manzano, Maria Soledad, Roman, Faustin Laurenţiu, Rubbia, Carlo, Sabaté-Gilarte, Marta, Sarmento, Raul, Saxena, Alok, Schillebeeckx, Peter, Schmidt, Stefan, Schumann, Dorothea, Tagliente, Giuseppe, Taı́n Enríquez, José Luis, Tsinganis, Andrea, Valenta, Stanislav, Vannini, Gianni, Variale, Vincenzo, Vaz, Pedro, Ventura, Alberto, Versaci, Roberto, Vermeulen, Mark J., Vlachoudis, Vasilis, Vlastou, Rosa, Wallner, Anton, Ware, Timothy, Weigand, Mario, Weiß, Christina, Wright, Tobias, and Žugec, Petar

Abstract

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

Published
2016

5. The nucleosynthesis of heavy elements in Stars: the key isotope 25Mg

Author

Massimi, Cristian, Koehler, Paul Edward, Kopecky, Stefan, Mingrone, Federica, Schillebeeckx, Peter, Vannini, Gianni, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Ludmila, Barbagallo, Massimo, Bécares, Vicente, Bečvář, František, Belloni, Fabio, Berthoumieux, Eric, Billowes, Jonathan, Bosnar, Damir, Brugger, Markus, Calviani, Marco, Calviño Tavares, Francisco, Cano-Ott, Daniel, Carrapiço, Carlos, Cerutti, Francesco, Chiaveri, Enrico, Chin, Mary, Colonna, Nicola, Eleftheriadis, Christos, Ferrari, Alfredo, Fraval, Kevin, Ganesan, Srinivasan, García, Aczel Regino, Giubrone, Giuseppe, Gonçalves, Isabel F., González Romero, Enrique, Griesmayer, Erich, Guerrero, Carlos, Gunsing, Frank, Hernández Prieto, Alvaro, Jenkins, David G., Jericha, Erwin, Kadi, Yacine, Käppeler, Franz, Karadimos, Dimitri, Kivel, Nikolai, Krtička, Milan, Kroll, Jiří, Lampoudis, Christos, Langer, Christoph, Leal Cidoncha, Esther, Lederer, Claudia, Leeb, Helmut, Leong, Lou Sai, Losito, Roberto, Mallick, Amod K., Manousos, Athanasios, Marganiec, Justyna, Martínez, Trinitario, Mastinu, Pier Francesco, Mastromarco, Mario, Mendoza Cembranos, Emilio, Mengoni, Alberto, Milazzo, Paolo Maria, Mirea, Mihail, Mondalaers, Willy, Paradela Dobarro, Carlos, Pavlik, Andreas, Perkowski, Jaroslaw, Plompen, Arjan J. M., Praena, Javier, Quesada Molina, José Manuel, Rauscher, Thomas, Reifarth, René, Riego Pérez, Albert, Robles, Marisol S., Rubbia, Carlo, Sabaté Gilarte, Marta, Sarmento, Raul, Saxena, Alok, Schmidt, Sebastian, Schumann, Dorothea, Tagliente, Giuseppe, Tain, Jose Luis, Tarrío, Diego, Tassan-Got, Laurent, Tsinganis, Andrea, Valenta, Stanislav, Variale, Vincenzo, Vaz, Pedro, Ventura, Alberto, Vermeulen, Mark J., Vlachoudis, Vasilis, Vlastou, Rosa, Wallner, Anton, Ware, Timothy, Weigand, Mario, Weiß, Christina, Wright, Tobias, Žugec, Petar, and INPC 2013 – International Nuclear Physics Conference

Subjects
Astrophysics::High Energy Astrophysical Phenomena, ddc:530, Nuclear Experiment
Abstract

We have measured the radiative neutron-capture cross section and the total neutron-induced cross section of one of the most important isotopes for the s process, the 25Mg. The measurements have been carried out at the neutron time-of-flight facilities n_TOF at CERN (Switzerland) and GELINA installed at the EC-JRC-IRMM (Belgium). The cross sections as a function of neutron energy have been measured up to approximately 300 keV, covering the energy region of interest to the s process. The data analysis is ongoing and preliminary results show the potential relevance for the s process.

Published
2014

6. Ni-62(n,gamma) and Ni-63(n,gamma) cross sections measured at the n_TOF facility at CERN

Author

Lederer, Claudia, Domingo Pardo, César, Giubrone, Giuseppe, and Taín Enríquez, José Luis

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Física
Abstract

The cross section of the Ni-62(n,gamma) reaction was measured with the time-of-flight technique at the neutron time-of-flight facility nTOF at CERN. Capture kernels of 42 resonances were analyzed up to 200 keV neutron energy and Maxwellian averaged cross sections (MACS) from kT = 5-100 keV were calculated. With a total uncertainty of 4.5%, the stellar cross section is in excellent agreement with the the KADoNiS compilation at kT = 30 keV, while being systematically lower up to a factor of 1.6 at higher stellar temperatures. The cross section of the Ni-63(n,gamma) reaction was measured for the first time at nTOF. We determined unresolved cross sections from 10 to 270 keV with a systematic uncertainty of 17%. These results provide fundamental constraints on s-process production of heavier species, especially the production of Cu in massive stars, which serve as the dominant source of Cu in the solar system.

Published
2014

7. Neutron capture measurement of 54Fe and 57Fe at CERN n_TOF

Author

Giubrone, Giuseppe, Domingo Pardo, César, Taín, José Luis, Taín Enríquez, José Luis, and Departament de Física Atòmica, Molecular i Nuclear

Subjects
FÍSICA [UNESCO], Neutron Capture Cross Section, UNESCO::FÍSICA, UNESCO::ASTRONOMÍA Y ASTROFÍSICA, ASTRONOMÍA Y ASTROFÍSICA [UNESCO]
Abstract

137 páginas. Tesis Doctoral del Departamento de Física Atómica, Molecular y Nuclear de la Universidad de Valencia y del Instituto de Física Corpuscular (IFIC)., The measurement of the (n, ) cross section of 54Fe and 57Fe isotopes was performed at the CERN n_TOF facility with the aim of better understanding the s-process stellar nucleosynthesis in the Fe-Ni region. At the same time Fe is a structural material in accelerator driven systems (ADS) and accurate neutron cross sections are required for reliable design studies, to account for the neutron balance and for assessing the related uncertainties. The accurate measurement of the (n,gamma ) cross section of 54Fe and 57Fe isotopes in the resolved resonance region (RRR) has been carried out with high resolution using the time of ight technique. These measurements were performed using the total energy detector technique. An optimized detection setup has been used, which permitted the determination of their cross sections with a minimal in uence of neutron sensitivity. First part of this work was devoted to the MC simulation of the response function to calculate the corresponding weighting functions. These weighting functions were applied to the measured data in order to obtain the capture yield, and derive the capture cross section. An R-matrix analysis of the resolved resonance region has been performed for both nuclides, deriving the total radiative capture cross section and the corresponding resonance parameters. The analysis was carried out using the R-matrix code SAMMY. The results obtained in this work are compared with previous experiments performed elsewhere and with evaluated data. The results presented in this work are important to disentangle the r and s contribution observed in the old stars and for advanced reactor concepts.

Published
2014

8. Experimental neutron capture data of 58Ni from the CERN n_TOF facility

Author

International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics (15. : 2014 : Dresden), Žugec, Petar, Barbagallo, Massimo, Colonna, Nicola, Bosnar, Damir, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Laurent, Bécares, Vicente, Bečvář, František, Belloni, Fabio, Berthoumieux, Eric, Billowes, Jonathan, Boccone, Vittorio, Brugger, Markus, Calviani, Marco, Calviño Tavares, Francisco, Cano-Ott, Daniel, Carrapiço, Carlos, Cerutti, Francesco, Chiaveri, Enrico, Chin, Michael, Cortés Rossell, Guillem Pere, Cortés-Giraldo, Miguel Antonio, Diakaki, Maria, Domingo-Pardo, César, Dressler, Rugard, Durán, Ignacio, Dzysiuk, Nataliia, Eleftheriadis, Christos, Ferrari, Alfredo, Fraval, Kevin, Ganesan, Srinivasan, García Ríos, Aczel Regino, Giubrone, Giuseppe, Gómez Hornillos, María Belén, Gonçalves, Isabel Maria Ferro, González Romero, Enrique Miguel, Griesmayer, Erich, Guerrero Sánchez, Carlos, Gunsing, Frank, Gurusamy, Perumal, Heinitz, Stephan, Jenkins, David, Jericha, Erwin, Kadi, Yacine, Käppeler, Franz, Karadimos, Dimitri, Kivel, Nikolay, Koehler, Paul, Kokkoris, Michael, Krtička, Milan, Kroll, Jiří, Langer, Christoph, Lederer, Claudia, Leeb, Helmut, Leong, Lou Sai, Lo Meo, Sergio, Losito, Roberto, Manousos, Athanasios, Marganiec, Justyna, Martínez, Trinitario, Massimi, Cristian, Mastinu, Pierfrancesco, Mastromarco, Mario, Meaze, AKM Moinul Haque, Mendoza Cembranos, Emilio, Mengoni, Alberto, Milazzo, Paolo Maria, Mingrone, Federica, Mirea, Mihail, Mondalaers, Willy, Paradela Dobarro, Carlos, Pavlik, Andreas, Perkowski, Jarosław, Pignatari, Marco, Plompen, Arjan J. M., Praena, Javier, Quesada Molina, José Manuel, Rauscher, Thomas, Reifarth, René, Riegov, A., Roman, Faustin Laurenţiu, Rubbia, Carlo, Sarmento, Raul, Saxena, Alok, Schillebeeckx, Peter, Schmidt, Stefan, Schumann, Dorothea, Tagliente, Giuseppe, Taı́n Enríquez, José Luis, Tarrío Vilas, Diego, Tassan-Got, Laurent, Tsinganis, Andrea, Valenta, Stanislav, Vannini, Gianni, Variale, Vincenzo, Vaz, Pedro, Ventura, Alberto, Versaci, Roberto, Vermeulen, Mark J., Vlachoudis, Vasilis, Vlastou, Rosa, Wallner, Anton, Ware, Timothy, Weigand, Mario, Weiß, Christina, Wright, Tobias, International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics (15. : 2014 : Dresden), Žugec, Petar, Barbagallo, Massimo, Colonna, Nicola, Bosnar, Damir, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Laurent, Bécares, Vicente, Bečvář, František, Belloni, Fabio, Berthoumieux, Eric, Billowes, Jonathan, Boccone, Vittorio, Brugger, Markus, Calviani, Marco, Calviño Tavares, Francisco, Cano-Ott, Daniel, Carrapiço, Carlos, Cerutti, Francesco, Chiaveri, Enrico, Chin, Michael, Cortés Rossell, Guillem Pere, Cortés-Giraldo, Miguel Antonio, Diakaki, Maria, Domingo-Pardo, César, Dressler, Rugard, Durán, Ignacio, Dzysiuk, Nataliia, Eleftheriadis, Christos, Ferrari, Alfredo, Fraval, Kevin, Ganesan, Srinivasan, García Ríos, Aczel Regino, Giubrone, Giuseppe, Gómez Hornillos, María Belén, Gonçalves, Isabel Maria Ferro, González Romero, Enrique Miguel, Griesmayer, Erich, Guerrero Sánchez, Carlos, Gunsing, Frank, Gurusamy, Perumal, Heinitz, Stephan, Jenkins, David, Jericha, Erwin, Kadi, Yacine, Käppeler, Franz, Karadimos, Dimitri, Kivel, Nikolay, Koehler, Paul, Kokkoris, Michael, Krtička, Milan, Kroll, Jiří, Langer, Christoph, Lederer, Claudia, Leeb, Helmut, Leong, Lou Sai, Lo Meo, Sergio, Losito, Roberto, Manousos, Athanasios, Marganiec, Justyna, Martínez, Trinitario, Massimi, Cristian, Mastinu, Pierfrancesco, Mastromarco, Mario, Meaze, AKM Moinul Haque, Mendoza Cembranos, Emilio, Mengoni, Alberto, Milazzo, Paolo Maria, Mingrone, Federica, Mirea, Mihail, Mondalaers, Willy, Paradela Dobarro, Carlos, Pavlik, Andreas, Perkowski, Jarosław, Pignatari, Marco, Plompen, Arjan J. M., Praena, Javier, Quesada Molina, José Manuel, Rauscher, Thomas, Reifarth, René, Riegov, A., Roman, Faustin Laurenţiu, Rubbia, Carlo, Sarmento, Raul, Saxena, Alok, Schillebeeckx, Peter, Schmidt, Stefan, Schumann, Dorothea, Tagliente, Giuseppe, Taı́n Enríquez, José Luis, Tarrío Vilas, Diego, Tassan-Got, Laurent, Tsinganis, Andrea, Valenta, Stanislav, Vannini, Gianni, Variale, Vincenzo, Vaz, Pedro, Ventura, Alberto, Versaci, Roberto, Vermeulen, Mark J., Vlachoudis, Vasilis, Vlastou, Rosa, Wallner, Anton, Ware, Timothy, Weigand, Mario, Weiß, Christina, and Wright, Tobias

Abstract

The neutron capture cross section of 58Ni was measured at the neutron time of flight facility n_TOF at CERN, from 27 meV to 400 keV neutron energy. Special care has been taken to identify all the possible sources of background, with the so-called neutron background obtained for the first time using high-precision GEANT4 simulations. The energy range up to 122 keV was treated as the resolved resonance region, where 51 resonances were identified and analyzed by a multilevel R-matrix code SAMMY. Above 122 keV the code SESH was used in analyzing the unresolved resonance region of the capture yield. Maxwellian averaged cross sections were calculated in the temperature range of kT = 5 – 100 keV, and their astrophysical implications were investigated.

Published
2015

9. Neutron Capture Cross Section of Unstable Ni-63: Implications for Stellar Nucleosynthesis

Author

n_TOF Collaboration, Lederer, Claudia, Domingo Pardo, César, Giubrone, Giuseppe, Taín, José Luis, Austrian Science Fund, National Science Foundation (US), and Hungarian Academy of Sciences

Subjects
Massive stars, Astrophysics::High Energy Astrophysical Phenomena, S-process nucleosynthesis
Abstract

The Ni-63(n, gamma) cross section has been measured for the first time at the neutron time-of-flight facility n_TOF at CERN from thermal neutron energies up to 200 keV. In total, capture kernels of 12 (new) resonances were determined. Maxwellian averaged cross sections were calculated for thermal energies from kT = 5-100 keV with uncertainties around 20%. Stellar model calculations for a 25M(circle dot) star show that the new data have a significant effect on the s-process production of Cu-63, Ni-64, and Zn-64 in massive stars, allowing stronger constraints on the Cu yields from explosive nucleosynthesis in the subsequent supernova. DOI: 10.1103/PhysRevLett.110.022501, The authors would like to thank H. Danninger and C. Gierl of the Technical University of Vienna for their help preparing the 62Ni sample. This work was partly supported by the Austrian Science Fund (FWF), Projects No. P20434 and No. I428. M. P. also acknowledges the support from the Ambizione grant of the Swiss NSF, the NSF Grants No. PHY 02-16783 and No. PHY 09-22648 (Joint Institute for Nuclear Astrophysics, JINA), EU Grant No. MIRG-CT-2006-046520, and EuroGenesis. T. R. acknowledges support from EuroGenesis, the FP7 ENSAR/THEXO project, and a "Distinguished Guest Scientist Fellowship" from the Hungarian Academy of Sciences.

Published
2013

10. New measurement of the astrophysically important reaction 62Ni(n,gamma) at n_TOF

Author

Lederer, Claudia, Andriamonje, Samuel, Andrzejewski, J, Audouin, Ludmila, Bécares, Vicente, Becvar, Frantisek, Belloni, Francesca, Berthier, B, Berthoumieux, Eric, Brugger, Markus, Calviani, M, Calvino, Francisco, Cano Ott, Daniel, Carrapico, C., Cerutti, Fabio, Chiaveri, E, Chin, M., Colonna, N, Cortes, Guillem, Cortés-Giraldo, M. A., Dillmann, Iris, Domingo-Pardo, César, Duran, I, Fernández-Ordóñez, Manuel, Ferrari, Arnaud, Ganesan, S., Giubrone, Giuseppe, Gómez Hornillo, M. Belén, Goncalves, Isabel Maria Ferro, Gonzalez-Romero, E, Gunsing, Frank, Harrisopulos, Sotirios, Heil, Michael, Ioannides, K G, Jericha, E, Kadi, Yacine, Käppeler, Franz, Karadimos, Dimitrios, Krticka, M, Lebbos, Elias, Leeb, Helmut, Losito, Roberto, Lozano, M, Marganiec, J, Marrone, S, Martinez, Trinitario, Massimi, Cristian, Mastinu, P F, Meaze, Moinul Haque, Mendoza, Emilio, Mengoni, Alberto, Milazzo, P M, Paradela, Carlos, Pavlik, Andreas, Perkowski, Jan, Plag, Ralf, Praena, Javier, Quesada Molina, Jose Manuel, Rauscher, Thomas, Reifarth, Rene, Roman, Francisco L., Rubbia, Carlo, Sarmento, Raúl, Tagliente, Giuseppe, Tain Enriquez, Jose Luis, Tarrio, Diego, Tassan-Got, Laurent, Tlustos, Lukas, Vannini, Gianni, Variale, Vincenzo, Vaz, Pedro, Ventura, A, Vlachoudis, Vassilis, Vlastou, R, Wallner, Anton, and Weiß, C.

Published
2011

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

Author

Massimi, Cristian, Andriamonje, Samuel, Andrzejewski, J, Audouin, Ludmila, Bécares, Vicente, Becvar, Frantisek, Belloni, Fabio, Berthier, B, Berthoumieux, E, Brugger, Markus, Calviani, M, Calvino, Francisco, Cano Ott, Daniel, Carrapico, C., Cerutti, Fabio, Chiaveri, E, Chin, M., Colonna, N, Cortes, Guillem, Cortés-Giraldo, M. A., Dillmann, Iris, Domingo-Pardo, César, Duran, I, Fernández-Ordóñez, Manuel, Ferrari, Arnaud, Fraval, K., Ganesan, S., Giubrone, Giuseppe, Gómez Hornillo, M. Belén, Goncalves, Isabel Maria Ferro, Gonzalez - Romero, E, Gramegna, F, Guerrero, Carlos, Gunsing, Frank, Harrisopulos, Sotirios, Heil, Michael, Ioannides, K G, Jericha, E, Kadi, Yacine, Käppeler, Franz, Karadimos, Dimitrios, Krticka, M, Lebbos, Elias, Lederer, Claudia, Leeb, Helmut, Losito, Roberto, Lozano, M, Marganiec, J, Marrone, S, Martinez, Trinitario, Mastinu, P F, Meaze, Moinul Haque, Mendoza, Emilio, Mengoni, Alberto, Milazzo, P M, Paradela, Carlos, Pavlik, Andreas, Perkowski, Jan, Plag, Ralf, Praena, Javier, Quesada Molina, Jose Manuel, Rauscher, Thomas, Reifarth, Rene, Roman, Francisco L., Rubbia, Carlo, Sarmento, Raúl, Tagliente, Giuseppe, Tain Enriquez, Jose Luis, Tarrio, Diego, Tassan-Got, Laurent, Tlustos, Lukas, Vannini, Gianni, Variale, Vincenzo, Vaz, Pedro, Ventura, A, Vlachoudis, Vassilis, Vlastou, R, Wallner, Anton, and Weiß, C.

Published
2011

12. The nucleosynthesis of heavy elements in stars: the key isotope 25Mg

Author

INPC 2013 – International Nuclear Physics Conference, Massimi, Cristian, Koehler, Paul Edward, Kopecky, Stefan, Mingrone, Federica, Schillebeeckx, Peter, Vannini, Gianni, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Ludmila, Barbagallo, Massimo, Bécares, Vicente, Bečvář, František, Belloni, Fabio, Berthoumieux, Eric, Billowes, Jonathan, Bosnar, Damir, Brugger, Markus, Calviani, Marco, Calviño Tavares, Francisco, Cano-Ott, Daniel, Carrapiço, Carlos, Cerutti, Francesco, Chiaveri, Enrico, Chin, Mary, Colonna, Nicola, Eleftheriadis, Christos, Ferrari, Alfredo, Fraval, Kevin, Ganesan, Srinivasan, García, Aczel Regino, Giubrone, Giuseppe, Gonçalves, Isabel Maria Ferro, González Romero, Enrique, Griesmayer, Erich, Guerrero Sánchez, Carlos, Gunsing, Frank, Hernández Prieto, Alvaro, Jenkins, David, Jericha, Erwin, Kadi, Yacine, Käppeler, Franz, Karadimos, Dimitri, Kivel, Nikolay, Krtička, Milan, Kroll, Jiří, Lampoudis, Christos, Langer, Christoph, Leal Cidoncha, Esther, Lederer, Claudia, Leeb, Helmut, Leong, Lou Sai, Losito, Roberto, Mallick, Amod K., Manousos, Athanasios, Marganiec, Justyna, Martínez, Trinitario, Mastinu, Pierfrancesco, Mastromarco, Mario, Mendoza Cembranos, Emilio, Mengoni, Alberto, Milazzo, Paolo Maria, Mirea, Mihail, Mondalaers, Willy, Paradela Dobarro, Carlos, Pavlik, Andreas, Perkowski, Jarosław, Plompen, Arjan J. M., Praena, Javier, Quesada Molina, José Manuel, Rauscher, Thomas, Reifarth, René, Riego Pérez, Albert, Robles, Marisol S., Rubbia, Carlo, Sabaté Gilarte, Marta, Sarmento, Raul, Saxena, Alok, Schmidt, Sebastian, Schumann, Dorothea, Tagliente, Giuseppe, Taı́n Enríquez, José Luis, Tarríoi Vilas, Diego, Tassan-Got, Laurent, Tsinganis, Andrea, Valenta, Stanislav, Variale, Vincenzo, Vaz, Pedro, Ventura, Alberto, Vermeulen, Mark J., Vlachoudis, Vasilis, Vlastou, Rosa, Wallner, Anton, Ware, Timothy, Weigand, Mario, Weiß, Christina, Wright, Tobias, Žugec, Petar, INPC 2013 – International Nuclear Physics Conference, Massimi, Cristian, Koehler, Paul Edward, Kopecky, Stefan, Mingrone, Federica, Schillebeeckx, Peter, Vannini, Gianni, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Ludmila, Barbagallo, Massimo, Bécares, Vicente, Bečvář, František, Belloni, Fabio, Berthoumieux, Eric, Billowes, Jonathan, Bosnar, Damir, Brugger, Markus, Calviani, Marco, Calviño Tavares, Francisco, Cano-Ott, Daniel, Carrapiço, Carlos, Cerutti, Francesco, Chiaveri, Enrico, Chin, Mary, Colonna, Nicola, Eleftheriadis, Christos, Ferrari, Alfredo, Fraval, Kevin, Ganesan, Srinivasan, García, Aczel Regino, Giubrone, Giuseppe, Gonçalves, Isabel Maria Ferro, González Romero, Enrique, Griesmayer, Erich, Guerrero Sánchez, Carlos, Gunsing, Frank, Hernández Prieto, Alvaro, Jenkins, David, Jericha, Erwin, Kadi, Yacine, Käppeler, Franz, Karadimos, Dimitri, Kivel, Nikolay, Krtička, Milan, Kroll, Jiří, Lampoudis, Christos, Langer, Christoph, Leal Cidoncha, Esther, Lederer, Claudia, Leeb, Helmut, Leong, Lou Sai, Losito, Roberto, Mallick, Amod K., Manousos, Athanasios, Marganiec, Justyna, Martínez, Trinitario, Mastinu, Pierfrancesco, Mastromarco, Mario, Mendoza Cembranos, Emilio, Mengoni, Alberto, Milazzo, Paolo Maria, Mirea, Mihail, Mondalaers, Willy, Paradela Dobarro, Carlos, Pavlik, Andreas, Perkowski, Jarosław, Plompen, Arjan J. M., Praena, Javier, Quesada Molina, José Manuel, Rauscher, Thomas, Reifarth, René, Riego Pérez, Albert, Robles, Marisol S., Rubbia, Carlo, Sabaté Gilarte, Marta, Sarmento, Raul, Saxena, Alok, Schmidt, Sebastian, Schumann, Dorothea, Tagliente, Giuseppe, Taı́n Enríquez, José Luis, Tarríoi Vilas, Diego, Tassan-Got, Laurent, Tsinganis, Andrea, Valenta, Stanislav, Variale, Vincenzo, Vaz, Pedro, Ventura, Alberto, Vermeulen, Mark J., Vlachoudis, Vasilis, Vlastou, Rosa, Wallner, Anton, Ware, Timothy, Weigand, Mario, Weiß, Christina, Wright, Tobias, and Žugec, Petar

Abstract

We have measured the radiative neutron-capture cross section and the total neutron-induced cross section of one of the most important isotopes for the s process, the 25Mg. The measurements have been carried out at the neutron time-of-flight facilities n_TOF at CERN (Switzerland) and GELINA installed at the EC-JRC-IRMM (Belgium). The cross sections as a function of neutron energy have been measured up to approximately 300 keV, covering the energy region of interest to the s process. The data analysis is ongoing and preliminary results show the potential relevance for the s process.

Published
2014

13. Measurements of neutron cross sections for advanced nuclear energy systems at n_TOF (CERN)

Author

International Nuclear Physics Conference (25. : 2013 : Firenze, Italy), Barbagallo, Massimo, Colonna, Nicola, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Laurent, Bécares, Vicente, Bečvář, František, Belloni, Fabio, Berthoumieux, Eric, Billowes, Jonathan, Bosnar, Damir, Brugger, Markus, Calviani, Marco, Calviño Tavares, Francisco, Cano-Ott, Daniel, Carrapiço, Carlos, Cerutti, Francesco, Chiaveri, Enrico, Chin, Michael, Cortés Rossell, Guillem Pere, Cortés-Giraldo, Miguel Antonio, Diakaki, Maria, Domingo-Pardo, César, Durán, Ignacio, Dressler, Rugard, Eleftheriadis, Christos, Ferrari, Alfredo, Fraval, Kevin, Ganesan, Srinivasan, García Ríos, Aczel Regino, Giubrone, Giuseppe, Gonçalves, Isabel Maria Ferro, González Romero, Enrique Miguel, Griesmayer, Erich, Guerrero Sánchez, Carlos, Gunsing, Frank, Hernández Prieto, Álvaro, Jenkins, David, Jericha, Erwin, Kadi, Yacine, Käppeler, Franz, Karadimos, Dimitri, Kivel, Nikolay, Koehler, Paul, Krtička, Milan, Kroll, Jiří, Lampoudis, Christos, Langer, Christoph, Leal Cidoncha, Esther, Lederer, Claudia, Leeb, Helmut, Leong, Lou Sai, Losito, Roberto, Manousos, Athanasios, Marganiec, Justyna, Martı́nez, Trinitario, Massimi, Cristian, Mastinu, Pierfrancesco, Mastromarco, Mario, Mendoza Cembranos, Emilio, Mengoni, Alberto, Milazzo, Paolo Maria, Mingrone, Federica, Mirea, Mihail, Mondalaers, Willy, Paradela Dobarro, Carlos, Pavlik, Andreas, Perkowski, Jarosław, Plompen, Arjan J. M., Praena, Javier, Quesada Molina, José Manuel, Rauscher, Thomas, Reifarth, René, Riego Pérez, Albert, Rubbia, Carlo, Sabaté-Gilarte, Marta, Sarmento, Raul, Saxena, Alok, Schillebeeckx, Peter, Schmidt, Stefan, Schumann, Dorothea, Tagliente, Giuseppe, Taı́n Enríquez, José Luis, Tarrío Vilas, Diego, Tassan-Got, Laurent, Tsinganis, Andrea, Valenta, Stanislav, Vannini, Gianni, Variale, Vincenzo, Vaz, Pedro, Ventura, Alberto, Vermeulen, Mark J., Vlachoudis, Vasilis, Vlastou, Rosa, Wallner, Anton, Ware, Timothy, Weigand, Mario, Weiß, Christina, Wright, Tobias, Žugec, Petar, International Nuclear Physics Conference (25. : 2013 : Firenze, Italy), Barbagallo, Massimo, Colonna, Nicola, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Laurent, Bécares, Vicente, Bečvář, František, Belloni, Fabio, Berthoumieux, Eric, Billowes, Jonathan, Bosnar, Damir, Brugger, Markus, Calviani, Marco, Calviño Tavares, Francisco, Cano-Ott, Daniel, Carrapiço, Carlos, Cerutti, Francesco, Chiaveri, Enrico, Chin, Michael, Cortés Rossell, Guillem Pere, Cortés-Giraldo, Miguel Antonio, Diakaki, Maria, Domingo-Pardo, César, Durán, Ignacio, Dressler, Rugard, Eleftheriadis, Christos, Ferrari, Alfredo, Fraval, Kevin, Ganesan, Srinivasan, García Ríos, Aczel Regino, Giubrone, Giuseppe, Gonçalves, Isabel Maria Ferro, González Romero, Enrique Miguel, Griesmayer, Erich, Guerrero Sánchez, Carlos, Gunsing, Frank, Hernández Prieto, Álvaro, Jenkins, David, Jericha, Erwin, Kadi, Yacine, Käppeler, Franz, Karadimos, Dimitri, Kivel, Nikolay, Koehler, Paul, Krtička, Milan, Kroll, Jiří, Lampoudis, Christos, Langer, Christoph, Leal Cidoncha, Esther, Lederer, Claudia, Leeb, Helmut, Leong, Lou Sai, Losito, Roberto, Manousos, Athanasios, Marganiec, Justyna, Martı́nez, Trinitario, Massimi, Cristian, Mastinu, Pierfrancesco, Mastromarco, Mario, Mendoza Cembranos, Emilio, Mengoni, Alberto, Milazzo, Paolo Maria, Mingrone, Federica, Mirea, Mihail, Mondalaers, Willy, Paradela Dobarro, Carlos, Pavlik, Andreas, Perkowski, Jarosław, Plompen, Arjan J. M., Praena, Javier, Quesada Molina, José Manuel, Rauscher, Thomas, Reifarth, René, Riego Pérez, Albert, Rubbia, Carlo, Sabaté-Gilarte, Marta, Sarmento, Raul, Saxena, Alok, Schillebeeckx, Peter, Schmidt, Stefan, Schumann, Dorothea, Tagliente, Giuseppe, Taı́n Enríquez, José Luis, Tarrío Vilas, Diego, Tassan-Got, Laurent, Tsinganis, Andrea, Valenta, Stanislav, Vannini, Gianni, Variale, Vincenzo, Vaz, Pedro, Ventura, Alberto, Vermeulen, Mark J., Vlachoudis, Vasilis, Vlastou, Rosa, Wallner, Anton, Ware, Timothy, Weigand, Mario, Weiß, Christina, Wright, Tobias, and Žugec, Petar

Abstract

The n_TOF facility operates at CERN with the aim of addressing the request of high accuracy nuclear data for advanced nuclear energy systems as well as for nuclear astrophysics. Thanks to the features of the neutron beam, important results have been obtained on neutron induced fission and capture cross sections of U, Pu and minor actinides. Recently the construction of another beam line has started; the new line will be complementary to the first one, allowing to further extend the experimental program foreseen for next measurement campaigns.

Published
2014

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

Author

European Energy Conference (3. : 2013 : Budapest), Barbagallo, Massimo, Mastromarco, Mario, Colonna, Nicola, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Laurent, Bécares, Vicente, Bečvář, František, Belloni, Fabio, Berthoumieux, Eric, Billowes, Jonathan, Bosnar, Damir, Brugger, Markus, Calviani, Marco, Calviño Tavares, Francisco, Cano-Ott, Daniel, Carrapiço, Carlos, Cerutti, Francesco, Chiaveri, Enrico, Chin, Michael, Cortés Rossell, Guillem Pere, Cortés-Giraldo, Miguel Antonio, Diakaki, Maria, Domingo-Pardo, César, Durán, Ignacio, Dressler, Rugard, Eleftheriadis, Christos, Ferrari, Alfredo, Fraval, Kevin, Ganesan, Srinivasan, García Ríos, Aczel Regino, Giubrone, Giuseppe, Gonçalves, Isabel Maria Ferro, González Romero, Enrique Miguel, Griesmayer, Erich, Guerrero Sánchez, Carlos, Gunsing, Frank, Hernández Prieto, Álvaro, Jenkins, David, Jericha, Erwin, Kadi, Yacine, Käppeler, Franz, Karadimos, Dimitri, Kivel, Nikolay, Koehler, Paul, Krtička, Milan, Kroll, Jiří, Lampoudis, Christos, Langer, Christoph, Leal Cidoncha, Esther, Lederer, Claudia, Leeb, Helmut, Leong, Lou Sai, Losito, Roberto, Manousos, Athanasios, Marganiec, Justyna, Martínez, Trinitario, Massimi, Cristian, Mastinu, Pierfrancesco, Mendoza Cembranos, Emilio, Mengoni, Alberto, Milazzo, Paolo Maria, Mingrone, Federica, Mirea, Mihail, Mondalaers, Willy, Paradela Dobarro, Carlos, Pavlik, Andreas, Perkowski, Jarosław, Plompen, Arjan J. M., Praena, Javier, Quesada Molina, José Manuel, Rauscher, Thomas, Reifarth, René, Riego Pérez, Albert, Rubbia, Carlo, Sabaté-Gilarte, Marta, Sarmento, Raul, Saxena, Alok, Schillebeeckx, Peter, Schmidt, Stefan, Schumann, Dorothea, Tagliente, Giuseppe, Taı́n Enríquez, José Luis, Tarrío Vilas, Diego, Tassan-Got, Laurent, Tsinganis, Andrea, Valenta, Stanislav, Vannini, Gianni, Variale, Vincenzo, Vaz, Pedro, Ventura, Alberto, Vermeulen, Mark J., Vlachoudis, Vasilis, Vlastou, Rosa, Wallner, Anton, Ware, Timothy, Weigand, Mario, Weiß, Christina, Wright, Tobias, Žugec, Petar, European Energy Conference (3. : 2013 : Budapest), Barbagallo, Massimo, Mastromarco, Mario, Colonna, Nicola, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Laurent, Bécares, Vicente, Bečvář, František, Belloni, Fabio, Berthoumieux, Eric, Billowes, Jonathan, Bosnar, Damir, Brugger, Markus, Calviani, Marco, Calviño Tavares, Francisco, Cano-Ott, Daniel, Carrapiço, Carlos, Cerutti, Francesco, Chiaveri, Enrico, Chin, Michael, Cortés Rossell, Guillem Pere, Cortés-Giraldo, Miguel Antonio, Diakaki, Maria, Domingo-Pardo, César, Durán, Ignacio, Dressler, Rugard, Eleftheriadis, Christos, Ferrari, Alfredo, Fraval, Kevin, Ganesan, Srinivasan, García Ríos, Aczel Regino, Giubrone, Giuseppe, Gonçalves, Isabel Maria Ferro, González Romero, Enrique Miguel, Griesmayer, Erich, Guerrero Sánchez, Carlos, Gunsing, Frank, Hernández Prieto, Álvaro, Jenkins, David, Jericha, Erwin, Kadi, Yacine, Käppeler, Franz, Karadimos, Dimitri, Kivel, Nikolay, Koehler, Paul, Krtička, Milan, Kroll, Jiří, Lampoudis, Christos, Langer, Christoph, Leal Cidoncha, Esther, Lederer, Claudia, Leeb, Helmut, Leong, Lou Sai, Losito, Roberto, Manousos, Athanasios, Marganiec, Justyna, Martínez, Trinitario, Massimi, Cristian, Mastinu, Pierfrancesco, Mendoza Cembranos, Emilio, Mengoni, Alberto, Milazzo, Paolo Maria, Mingrone, Federica, Mirea, Mihail, Mondalaers, Willy, Paradela Dobarro, Carlos, Pavlik, Andreas, Perkowski, Jarosław, Plompen, Arjan J. M., Praena, Javier, Quesada Molina, José Manuel, Rauscher, Thomas, Reifarth, René, Riego Pérez, Albert, Rubbia, Carlo, Sabaté-Gilarte, Marta, Sarmento, Raul, Saxena, Alok, Schillebeeckx, Peter, Schmidt, Stefan, Schumann, Dorothea, Tagliente, Giuseppe, Taı́n Enríquez, José Luis, Tarrío Vilas, Diego, Tassan-Got, Laurent, Tsinganis, Andrea, Valenta, Stanislav, Vannini, Gianni, Variale, Vincenzo, Vaz, Pedro, Ventura, Alberto, Vermeulen, Mark J., Vlachoudis, Vasilis, Vlastou, Rosa, Wallner, Anton, Ware, Timothy, Weigand, Mario, Weiß, Christina, Wright, Tobias, and Žugec, Petar

Abstract

The study of neutron-induced reactions is of high relevance in a wide variety of fields, ranging from stellar nucleosynthesis and fundamental nuclear physics to applications of nuclear technology. In nuclear energy, high accuracy neutron data are needed for the development of Generation IV fast reactors and accelerator driven systems, these last aimed specifically at nuclear waste incineration, as well as for research on innovative fuel cycles. In this context, a high luminosity Neutron Time Of Flight facility, n_TOF, is operating at CERN since more than a decade, with the aim of providing new, high accuracy and high resolution neutron cross-sections. Thanks to the features of the neutron beam, a rich experimental program relevant to nuclear technology has been carried out so far. The program will be further expanded in the near future, thanks in particular to a new high-flux experimental area, now under construction.

Published
2014

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

Author

Žugec, Petar, Colonna, Nicola, Bosnar, Damir, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Laurent, Barbagallo, Massimo, Bécares, Vicente, Bečvář, František, Belloni, Fabio, Berthoumieux, Eric, Billowes, Jonathan, Boccone, Vittorio, Brugger, Markus, Calviani, Marco, Calviño Tavares, Francisco, Cano-Ott, Daniel, Carrapiço, Carlos, Cerutti, Francesco, Chiaveri, Enrico, Chin, Michael, Cortés Rossell, Guillem Pere, Cortés-Giraldo, Miguel Antonio, Diakaki, Maria, Domingo-Pardo, César, Dressler, Rugard, Durán, Ignacio, Dzysiuk, Nataliia, Eleftheriadis, Christos, Ferrari, Alfredo, Fraval, Kevin, Ganesan, Srinivasan, García Ríos, Aczel Regino, Giubrone, Giuseppe, Gómez Hornillos, María Belén, Gonçalves, Isabel Maria Ferro, González Romero, Enrique Miguel, Griesmayer, Erich, Guerrero Sánchez, Carlos, Gunsing, Frank, Gurusamy, Perumal, Heinitz, Stephan, Jenkins, David, Jericha, Erwin, Kadi, Yacine, Käppeler, Franz, Karadimos, Dimitri, Kivel, Nikolay, Koehler, Paul, Kokkoris, Michael, Krtička, Milan, Kroll, Jiří, Langer, Christoph, Lederer, Claudia, Leeb, Helmut, Leong, Lou Sai, Lo Meo, Sergio, Losito, Roberto, Manousos, Athanasios, Marganiec, Justyna, Martínez, Trinitario, Massimi, Cristian, Mastinu, Pierfrancesco, Mastromarco, Mario, Meaze, AKM Moinul Haque, Mendoza Cembranos, Emilio, Mengoni, Alberto, Milazzo, Paolo Maria, Mingrone, Federica, Mirea, Mihail, Mondalaers, Willy, Paradela Dobarro, Carlos, Pavlik, Andreas, Perkowski, Jarosław, Plompen, Arjan J. M., Praena, Javier, Quesada Molina, José Manuel, Rauscher, Thomas, Reifarth, René, Riego Pérez, Albert, Roman, Faustin Laurenţiu, Rubbia, Carlo, Sarmento, Raul, Saxena, Alok, Schillebeeckx, Peter, Schmidt, Stefan, Schumann, Dorothea, Tagliente, Giuseppe, Taı́n Enríquez, José Luis, Tarrío Vilas, Diego, Tassan-Got, Laurent, Tsinganis, Andrea, Valenta, Stanislav, Vannini, Gianni, Variale, Vincenzo, Vaz, Pedro, Ventura, Alberto, Versaci, Roberto, Vermeulen, Mark J., Vlachoudis, Vasilis, Vlastou, Rosa, Wallner, Anton, Ware, Timothy, Weigand, Mario, Weiß, Christina, Wright, Tobias, Žugec, Petar, Colonna, Nicola, Bosnar, Damir, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Laurent, Barbagallo, Massimo, Bécares, Vicente, Bečvář, František, Belloni, Fabio, Berthoumieux, Eric, Billowes, Jonathan, Boccone, Vittorio, Brugger, Markus, Calviani, Marco, Calviño Tavares, Francisco, Cano-Ott, Daniel, Carrapiço, Carlos, Cerutti, Francesco, Chiaveri, Enrico, Chin, Michael, Cortés Rossell, Guillem Pere, Cortés-Giraldo, Miguel Antonio, Diakaki, Maria, Domingo-Pardo, César, Dressler, Rugard, Durán, Ignacio, Dzysiuk, Nataliia, Eleftheriadis, Christos, Ferrari, Alfredo, Fraval, Kevin, Ganesan, Srinivasan, García Ríos, Aczel Regino, Giubrone, Giuseppe, Gómez Hornillos, María Belén, Gonçalves, Isabel Maria Ferro, González Romero, Enrique Miguel, Griesmayer, Erich, Guerrero Sánchez, Carlos, Gunsing, Frank, Gurusamy, Perumal, Heinitz, Stephan, Jenkins, David, Jericha, Erwin, Kadi, Yacine, Käppeler, Franz, Karadimos, Dimitri, Kivel, Nikolay, Koehler, Paul, Kokkoris, Michael, Krtička, Milan, Kroll, Jiří, Langer, Christoph, Lederer, Claudia, Leeb, Helmut, Leong, Lou Sai, Lo Meo, Sergio, Losito, Roberto, Manousos, Athanasios, Marganiec, Justyna, Martínez, Trinitario, Massimi, Cristian, Mastinu, Pierfrancesco, Mastromarco, Mario, Meaze, AKM Moinul Haque, Mendoza Cembranos, Emilio, Mengoni, Alberto, Milazzo, Paolo Maria, Mingrone, Federica, Mirea, Mihail, Mondalaers, Willy, Paradela Dobarro, Carlos, Pavlik, Andreas, Perkowski, Jarosław, Plompen, Arjan J. M., Praena, Javier, Quesada Molina, José Manuel, Rauscher, Thomas, Reifarth, René, Riego Pérez, Albert, Roman, Faustin Laurenţiu, Rubbia, Carlo, Sarmento, Raul, Saxena, Alok, Schillebeeckx, Peter, Schmidt, Stefan, Schumann, Dorothea, Tagliente, Giuseppe, Taı́n Enríquez, José Luis, Tarrío Vilas, Diego, Tassan-Got, Laurent, Tsinganis, Andrea, Valenta, Stanislav, Vannini, Gianni, Variale, Vincenzo, Vaz, Pedro, Ventura, Alberto, Versaci, Roberto, Vermeulen, Mark J., Vlachoudis, Vasilis, Vlastou, Rosa, Wallner, Anton, Ware, Timothy, Weigand, Mario, Weiß, Christina, and Wright, Tobias

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 been implemented 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 a natC 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.

Published
2014

16. Neutron capture measurement of 54Fe and 57Fe at CERN n_TOF

Author

Domingo Pardo, César, Taín, José Luis, Giubrone, Giuseppe, Domingo Pardo, César, Taín, José Luis, and Giubrone, Giuseppe

Abstract

The measurement of the (n, ) cross section of 54Fe and 57Fe isotopes was performed at the CERN n_TOF facility with the aim of better understanding the s-process stellar nucleosynthesis in the Fe-Ni region. At the same time Fe is a structural material in accelerator driven systems (ADS) and accurate neutron cross sections are required for reliable design studies, to account for the neutron balance and for assessing the related uncertainties. The accurate measurement of the (n,gamma ) cross section of 54Fe and 57Fe isotopes in the resolved resonance region (RRR) has been carried out with high resolution using the time of ight technique. These measurements were performed using the total energy detector technique. An optimized detection setup has been used, which permitted the determination of their cross sections with a minimal in uence of neutron sensitivity. First part of this work was devoted to the MC simulation of the response function to calculate the corresponding weighting functions. These weighting functions were applied to the measured data in order to obtain the capture yield, and derive the capture cross section. An R-matrix analysis of the resolved resonance region has been performed for both nuclides, deriving the total radiative capture cross section and the corresponding resonance parameters. The analysis was carried out using the R-matrix code SAMMY. The results obtained in this work are compared with previous experiments performed elsewhere and with evaluated data. The results presented in this work are important to disentangle the r and s contribution observed in the old stars and for advanced reactor concepts.

Published
2014

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

Author

International Workshop on Nuclear Fission and Fission-Product Spectroscopy (5 : 2013 : Caen), Leong, Lou Sai, Tassan-Got, Laurent, Tarrío Vilas, Diego, Audouin, Laurent, Paradela Dobarro, Carlos, Durán, Ignacio, Le Naour, Claire, Altstadt, Sebastian, Andrzejewsky, Jozef, Barbagallo, Massimo, Bécares, Vicente, Bečvář, František, Belloni, Fabio, Berthoumieux, Eric, Billowes, Jonathan, Boccone, Vittorio, Bosnar, Damir, Brugger, Markus, Calviño Tavares, Francisco, Calviani, Marco, Cano-Ott, Daniel, Carrapiço, Carlos, Cerutti, Francesco, Chiaveri, Enrico, Chin, Michael, Colonna, Nicola, Cortés Rossell, Guillem Pere, Cortés-Giraldo, Miguel Antonio, Diakaki, Maria, Domingo-Pardo, César, Dressler, Rugard, Dzysiuk, Nataliia, Eleftheriadis, Christos, Ferrari, Alfredo, Fraval, Kevin, Ganesan, Srinivasan, García Ríos, Aczel Regino, Giubrone, Giuseppe, Gómez Hornillos, María Belén, Gonçalves, Isabel Maria Ferro, González Romero, Enrique Miguel, Griesmayer, Erich, Guerrero Sánchez, Carlos, Gunsing, Frank, Gurusamy, Perumal, Jenkins, David, Jericha, Erwin, Kadi, E., Käppeler, Franz, Karadimos, Dimitri, Kivel, Nikolay, Koehler, Paul, Kokkoris, Michael, Korschinek, Gunther, Kroll, Jiří, Krtička, Milan, Langer, Christoph, Lederer, Claudia, Leeb, Helmut, Losito, Roberto, Manousos, Athanasios, Marganiec, Justyna, Massimi, Cristian, Martı́nez, Trinitario, Mastinu, Pierfrancesco, Mastromarco, Mario, Meaze, AKM Moinul Haque, Mengon, A., Mendoza Cembranos, Emilio, Milazzo, Paolo Maria, Mingrone, T., Mirea, Mihail, Mondelaers, Willy, Pavlik, Andreas, Perkowski, Jarosław, Pignatari, Marco, Plompen, Arjan J. M., Praena, Javier, Quesada Molina, José Manuel, Rauscher, Thomas, Reifhart, R., Riego Pérez, Albert, Roman, Faustin Laurenţiu, Rubbia, Carlo, Sarmento, Raul, Schillebeeckx, Peter, Schmidt, Stefan, Schumann, Dorothea, Taı́n Enríquez, Jose Luis, Tagliente, Giuseppe, Tsinganis, Andrea, Valenta, Stanislav, Vannini, Gianni, Variale, Vincenzo, Vaz, Pedro, Ventura, Alberto, Versaci, Roberto, Vermeulen, Mark J., Vlachoudis, Vasilis, Vlastou, V., Wallner, Anton, Ware, Timothy, Weigand, Mario, Weiß, Christina, Wright, Tobias, Žugec, Petar, International Workshop on Nuclear Fission and Fission-Product Spectroscopy (5 : 2013 : Caen), Leong, Lou Sai, Tassan-Got, Laurent, Tarrío Vilas, Diego, Audouin, Laurent, Paradela Dobarro, Carlos, Durán, Ignacio, Le Naour, Claire, Altstadt, Sebastian, Andrzejewsky, Jozef, Barbagallo, Massimo, Bécares, Vicente, Bečvář, František, Belloni, Fabio, Berthoumieux, Eric, Billowes, Jonathan, Boccone, Vittorio, Bosnar, Damir, Brugger, Markus, Calviño Tavares, Francisco, Calviani, Marco, Cano-Ott, Daniel, Carrapiço, Carlos, Cerutti, Francesco, Chiaveri, Enrico, Chin, Michael, Colonna, Nicola, Cortés Rossell, Guillem Pere, Cortés-Giraldo, Miguel Antonio, Diakaki, Maria, Domingo-Pardo, César, Dressler, Rugard, Dzysiuk, Nataliia, Eleftheriadis, Christos, Ferrari, Alfredo, Fraval, Kevin, Ganesan, Srinivasan, García Ríos, Aczel Regino, Giubrone, Giuseppe, Gómez Hornillos, María Belén, Gonçalves, Isabel Maria Ferro, González Romero, Enrique Miguel, Griesmayer, Erich, Guerrero Sánchez, Carlos, Gunsing, Frank, Gurusamy, Perumal, Jenkins, David, Jericha, Erwin, Kadi, E., Käppeler, Franz, Karadimos, Dimitri, Kivel, Nikolay, Koehler, Paul, Kokkoris, Michael, Korschinek, Gunther, Kroll, Jiří, Krtička, Milan, Langer, Christoph, Lederer, Claudia, Leeb, Helmut, Losito, Roberto, Manousos, Athanasios, Marganiec, Justyna, Massimi, Cristian, Martı́nez, Trinitario, Mastinu, Pierfrancesco, Mastromarco, Mario, Meaze, AKM Moinul Haque, Mengon, A., Mendoza Cembranos, Emilio, Milazzo, Paolo Maria, Mingrone, T., Mirea, Mihail, Mondelaers, Willy, Pavlik, Andreas, Perkowski, Jarosław, Pignatari, Marco, Plompen, Arjan J. M., Praena, Javier, Quesada Molina, José Manuel, Rauscher, Thomas, Reifhart, R., Riego Pérez, Albert, Roman, Faustin Laurenţiu, Rubbia, Carlo, Sarmento, Raul, Schillebeeckx, Peter, Schmidt, Stefan, Schumann, Dorothea, Taı́n Enríquez, Jose Luis, Tagliente, Giuseppe, Tsinganis, Andrea, Valenta, Stanislav, Vannini, Gianni, Variale, Vincenzo, Vaz, Pedro, Ventura, Alberto, Versaci, Roberto, Vermeulen, Mark J., Vlachoudis, Vasilis, Vlastou, V., Wallner, Anton, Ware, Timothy, Weigand, Mario, Weiß, Christina, Wright, Tobias, and Žugec, Petar

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.

Published
2013

18. Neutron Capture Cross Section of Unstable Ni-63: Implications for Stellar Nucleosynthesis

Author

Austrian Science Fund, National Science Foundation (US), Hungarian Academy of Sciences, n_TOF Collaboration, Lederer, Claudia, Domingo Pardo, César, Giubrone, Giuseppe, Taín, José Luis, Austrian Science Fund, National Science Foundation (US), Hungarian Academy of Sciences, n_TOF Collaboration, Lederer, Claudia, Domingo Pardo, César, Giubrone, Giuseppe, and Taín, José Luis

Abstract

The Ni-63(n, gamma) cross section has been measured for the first time at the neutron time-of-flight facility n_TOF at CERN from thermal neutron energies up to 200 keV. In total, capture kernels of 12 (new) resonances were determined. Maxwellian averaged cross sections were calculated for thermal energies from kT = 5-100 keV with uncertainties around 20%. Stellar model calculations for a 25M(circle dot) star show that the new data have a significant effect on the s-process production of Cu-63, Ni-64, and Zn-64 in massive stars, allowing stronger constraints on the Cu yields from explosive nucleosynthesis in the subsequent supernova. DOI: 10.1103/PhysRevLett.110.022501

Published
2013

19. New measurement of the astrophysically important reaction 62Ni(n,\gamma ) at n_TOF

Author

Lederer, Claudia, primary, Berthoumieux, Eric, additional, Calviani, Marco, additional, Cano-Ott, Daniel, additional, Colonna, Nicola, additional, Dillmann, Iris, additional, Domingo-Pardo, Cesar, additional, Giubrone, Giuseppe, additional, Guerrero, Carlos, additional, Gunsing, Frank, additional, Heil, Michael, additional, Käppeler, Franz, additional, Leeb, Helmut, additional, Massimi, Cristian, additional, Mengoni, Alberto, additional, Tain, Jose Luis, additional, Vlachoudis, Vasilis, additional, and Wallner, Anton, additional

Published
2011
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