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

Author: Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Tarrío, Diego, Tassan Got, Laurence, Durán, I., Leong, L.S., Paradela Dobarro, Carlos, Audouin, Ludmila, Leal-Cidoncha, E., Le Naour, Claire, Caamaño Fresco, Manuel, Ventura, Alberto, Altstadt, Sebastian, Andrzejewski, Józef, Barbagallo, Massimo, Bécares, Vicente, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Riego Pérez, Albert, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Tarrío, Diego, Tassan Got, Laurence, Durán, I., Leong, L.S., Paradela Dobarro, Carlos, Audouin, Ludmila, Leal-Cidoncha, E., Le Naour, Claire, Caamaño Fresco, Manuel, Ventura, Alberto, Altstadt, Sebastian, Andrzejewski, Józef, Barbagallo, Massimo, Bécares, Vicente, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, and Riego Pérez, Albert
Abstract: The neutron-induced fission cross sections of 232 Th and 233 U were measured relative to 235 U in a wide neutron energy range up to 1 GeV (and from fission threshold in the case of 232 Th , and from 0.7 eV in case of 233 U ), using the white-spectrum neutron source at the CERN Neutron Time-of-Flight (n_TOF) facility. Parallel plate avalanche counters (PPACs) were used, installed at the Experimental Area 1 (EAR1), which is located at 185 m from the neutron spallation target. The anisotropic emission of fission fragments were taken into account in the detection efficiency by using, in the case of 233 U , previous results available in EXFOR, whereas in the case of 232 Th these data were obtained from our measurement, using PPACs and targets tilted 45 ° with respect to the neutron beam direction. Finally, the obtained results are compared with past measurements and major evaluated nuclear data libraries. Calculations using the high-energy reaction models INCL + + and ABLA07 were performed and some of their parameters were modified to reproduce the experimental results. At high energies, where no other neutron data exist, our results are compared with experimental data on proton-induced fission. Moreover, the dependence of the fission cross section at 1 GeV with the fissility parameter of the target nucleus is studied by combining those ( p , f ) data with our ( n , f ) data on 232 Th and 233 U and on other isotopes studied earlier at n_TOF using the same experimental setup., Peer Reviewed, Article escrit per 81 autors/autores: D. Tarrío , L. Tassan-Got, I. Duran, L. S. Leong, C. Paradela, L. Audouin, E. Leal-Cidoncha, C. Le Naour, M. Caamaño, A. Ventura, S. Altstadt, J. Andrzejewski, M. Barbagallo, V. Bécares, F. Becvá ˇ ˇr,F. Belloni, E. Berthoumieux, J. Billowes, V. Boccone, D. Bosnar, M. Brugger, M. Calviani, F. Calviño, D. Cano-Ott, C. Carrapiço, F. Cerutti, E. Chiaveri,M. Chin, N. Colonna, G. Cortés, M. A. Cortés-Giraldo, M. Diakaki, C. Domingo-Pardo, N. Dzysiuk, C. Eleftheriadis, A. Ferrari, K. Fraval, S. Ganesan, A. R. García, G. Giubrone, M. B. Gómez-Hornillos, I. F. Gonçalves, E. González-Romero,E. Griesmayer, C. Guerrero, F. Gunsing, P. Gurusamy, D. G. Jenkins, E. Jericha, Y. Kadi, F. Käppeler,† D. Karadimos, P. Koehler, M. Kokkoris, M. Krticka, J. Kroll, C. Langer, C. Lederer, H. Leeb, R. Losito, A. Manousos, J. Marganiec, T. Martínez, C. Massimi, P. F. Mastinu,M. Mastromarco, M. Meaze, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, M. Mirea,,† W. Mondalaers, A. Pavlik, J. Perkowski, A. Plompen, J. Praena, J. M. Quesada, T. Rauscher, R. Reifarth, A. Riego, M. S. Robles, F. Roman, C. Rubbia, R. Sarmento, P. Schillebeeckx,S. Schmidt, G. Tagliente, J. L. Tain, A. Tsinganis, S. Valenta, G. Vannini, V. Variale, P. Vaz, R. Versaci, M. J. Vermeulen, V. Vlachoudis, R. Vlastou,A. Wallner, T. Ware, M. Weigand, C. Weiß, T. J. Wright, P. Žugec, Postprint (published version)
Published: 2023

2. Zr 92 (n,?) and (n,tot) measurements at the GELINA and n_TOF facilities

Author: Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Tagliente, G., Bécares, Vicente, Calviño Tavares, Francisco, Calviani, Marco, Cano Ott, Daniel, Colonna, Nicola, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Martínez, T., Mastromarco, Mario, Mendoza, E., Praena, J., Riego Pérez, Albert, Lederer, Claudia, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Tagliente, G., Bécares, Vicente, Calviño Tavares, Francisco, Calviani, Marco, Cano Ott, Daniel, Colonna, Nicola, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Martínez, T., Mastromarco, Mario, Mendoza, E., Praena, J., Riego Pérez, Albert, and Lederer, Claudia
Abstract: Stellar nucleosynthesis of elements heavier than iron is driven by neutron capture processes. Zr92 is positioned at a strategic point along the slow nucleosynthesis path, given its proximity to the neutron magic number N=50 and its position at the matching region between the weak and main slow processes. Purpose: In parallel with recent improved astronomical data, the extraction of accurate Maxwellian averaged cross sections (MACSs) derived from a more complete and accurate set of resonance parameters should allow for a better understanding of the stellar conditions at which nucleosynthesis takes place. Methods: Transmission and capture cross section measurements using enriched Zr92 metallic samples were performed at the time-of flight facilities GELINA of JRC-Geel (BE) and n_TOF of CERN (CH). The neutron beam passing through the samples was investigated in transmission measurements at GELINA using a Li-glass scintillator. The ¿ rays emitted during the neutron capture reactions were detected by C6D6 detectors at both GELINA and n_TOF. Results: Resonance parameters of individual resonances up to 81 keV were extracted from a combined resonance shape analysis of experimental transmissions and capture yields. For the majority of the resonances the parity was determined from an analysis of the transmission data obtained with different sample thicknesses. Average resonance parameters were calculated. Conclusions: Maxwellian averaged cross sections were extracted from resonances observed up to 81 keV. The MACS for kT=30keV is fully consistent with experimental data reported in the literature. The MACSs for kT¿15keV are in good agreement with those derived from the ENDF/B-VIII.0 library and recommended in the KADoNiS database. For kT higher than 30 keV differences are observed. A comparison with MACSs obtained with the cross sections recommended in the JEFF-3.3 and JENDL-4.0 libraries shows discrepancies even for kT¿15keV., Peer Reviewed, Article escrit per 116 Autors/autores : Tagliente, G.; Kopecky, S.; Heyse, J.; Krtička, M.; Massimi, C.; Mengoni, A.; Milazzo, P. M.; Plompen, A. J. M.; Schillebeeckx, P.; Valenta, S.; Wynants, R.; Altstadt, S.; Andrzejewski, J.; Audouin, L.; Bécares, V.; Barbagallo, M.; Bečvář, F.; Belloni, F.; Berthoumieux, E.; Billowes, J.; Boccone, V.; Bosnar, D.; Brugger, M.; Calviño, F.; Calviani, M.; Cano-Ott, D.; Carrapiço, C.; Cerutti, F.; Chiaveri, E.; Chin, M.; Colonna, N.; Cortés, G.; Cortés-Giraldo, M. A.; Cristallo, S.; Diakaki, M.; Domingo-Pardo, C.; Dressler, R.; Durán, I.; Eleftheriadis, C.; Ferrari, A.; Fraval, K.; Furman, V.; Göbel, K.; Gómez-Hornillos, M. B.; Ganesan, S.; García, A. R.; Giubrone, G.; Gonçalves, I. F.; González-Romero, E.; Goverdovski, A¸ E. Griesmayer¸C. Guerrero; F. Gunsing; T. Heftrich; A. Hernández-Prieto; E. Jericha; F. Käppeler, Y. Kadi, D. Karadimos, T. Katabuchi, V. Ketlerov, V. Khryachkov, N. Kivel, M. Kokkoris, J. Kroll, C. Lampoudis, C. Langer, E. Leal-Cidoncha, C. Lederer, H. Leeb, L. S. Leong, R. Losito, M. Lugaro, A. Mallick, A. Manousos, J. Marganiec, T. Martínez, P. Mastinu, M. Mastromarco, E. Mendoza, F. Mingrone, M. Mirea, C. Paradela, A. Pavlik, J. Perkowski, J. Praena, J. M. Quesada, T. Rauscher, R. Reifarth, A. Riego-Perez, M. Robles, C. Rubbia, J. A. Ryan, M. Sabaté-Gilarte, R. Sarmento, A. Saxena, S. Schmidt, D. Schumann, P. Sedyshev, J. L. Tain, A. Tarifeño-Saldivia, D. Tarrío, L. Tassan-Got, A. Tsinganis, G. Vannini, V. Variale, P. Vaz, A. Ventura, M. J. Vermeulen, D. Vescovi, V. Vlachoudis, R. Vlastou,21 A. Wallner, T. Ware, M. Weigand, C. Weiss, T. Wright, P. Žugec, Postprint (published version)
Published: 2022

3. Zr 92 (n,?) and (n,tot) measurements at the GELINA and n_TOF facilities

Author: Tagliente, G., Bécares, Vicente, Calviño Tavares, Francisco, Calviani, Marco, Cano Ott, Daniel, Colonna, Nicola, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Martínez, T., Mastromarco, Mario, Mendoza, E., Praena, J., Riego Pérez, Albert, Lederer, Claudia, Universitat Politècnica de Catalunya. Departament de Física, and Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group
Subjects: Física [Àrees temàtiques de la UPC], Stellar nucleosynthesis, Nuclear physics, GELINA, Física nuclear, neutron magic number, Resonance parameters
Abstract: Stellar nucleosynthesis of elements heavier than iron is driven by neutron capture processes. Zr92 is positioned at a strategic point along the slow nucleosynthesis path, given its proximity to the neutron magic number N=50 and its position at the matching region between the weak and main slow processes. Purpose: In parallel with recent improved astronomical data, the extraction of accurate Maxwellian averaged cross sections (MACSs) derived from a more complete and accurate set of resonance parameters should allow for a better understanding of the stellar conditions at which nucleosynthesis takes place. Methods: Transmission and capture cross section measurements using enriched Zr92 metallic samples were performed at the time-of flight facilities GELINA of JRC-Geel (BE) and n_TOF of CERN (CH). The neutron beam passing through the samples was investigated in transmission measurements at GELINA using a Li-glass scintillator. The ¿ rays emitted during the neutron capture reactions were detected by C6D6 detectors at both GELINA and n_TOF. Results: Resonance parameters of individual resonances up to 81 keV were extracted from a combined resonance shape analysis of experimental transmissions and capture yields. For the majority of the resonances the parity was determined from an analysis of the transmission data obtained with different sample thicknesses. Average resonance parameters were calculated. Conclusions: Maxwellian averaged cross sections were extracted from resonances observed up to 81 keV. The MACS for kT=30keV is fully consistent with experimental data reported in the literature. The MACSs for kT¿15keV are in good agreement with those derived from the ENDF/B-VIII.0 library and recommended in the KADoNiS database. For kT higher than 30 keV differences are observed. A comparison with MACSs obtained with the cross sections recommended in the JEFF-3.3 and JENDL-4.0 libraries shows discrepancies even for kT¿15keV. Peer Reviewed Article escrit per 116 Autors/autores : Tagliente, G.; Kopecky, S.; Heyse, J.; Krtička, M.; Massimi, C.; Mengoni, A.; Milazzo, P. M.; Plompen, A. J. M.; Schillebeeckx, P.; Valenta, S.; Wynants, R.; Altstadt, S.; Andrzejewski, J.; Audouin, L.; Bécares, V.; Barbagallo, M.; Bečvář, F.; Belloni, F.; Berthoumieux, E.; Billowes, J.; Boccone, V.; Bosnar, D.; Brugger, M.; Calviño, F.; Calviani, M.; Cano-Ott, D.; Carrapiço, C.; Cerutti, F.; Chiaveri, E.; Chin, M.; Colonna, N.; Cortés, G.; Cortés-Giraldo, M. A.; Cristallo, S.; Diakaki, M.; Domingo-Pardo, C.; Dressler, R.; Durán, I.; Eleftheriadis, C.; Ferrari, A.; Fraval, K.; Furman, V.; Göbel, K.; Gómez-Hornillos, M. B.; Ganesan, S.; García, A. R.; Giubrone, G.; Gonçalves, I. F.; González-Romero, E.; Goverdovski, A¸ E. Griesmayer¸C. Guerrero; F. Gunsing; T. Heftrich; A. Hernández-Prieto; E. Jericha; F. Käppeler, Y. Kadi, D. Karadimos, T. Katabuchi, V. Ketlerov, V. Khryachkov, N. Kivel, M. Kokkoris, J. Kroll, C. Lampoudis, C. Langer, E. Leal-Cidoncha, C. Lederer, H. Leeb, L. S. Leong, R. Losito, M. Lugaro, A. Mallick, A. Manousos, J. Marganiec, T. Martínez, P. Mastinu, M. Mastromarco, E. Mendoza, F. Mingrone, M. Mirea, C. Paradela, A. Pavlik, J. Perkowski, J. Praena, J. M. Quesada, T. Rauscher, R. Reifarth, A. Riego-Perez, M. Robles, C. Rubbia, J. A. Ryan, M. Sabaté-Gilarte, R. Sarmento, A. Saxena, S. Schmidt, D. Schumann, P. Sedyshev, J. L. Tain, A. Tarifeño-Saldivia, D. Tarrío, L. Tassan-Got, A. Tsinganis, G. Vannini, V. Variale, P. Vaz, A. Ventura, M. J. Vermeulen, D. Vescovi, V. Vlachoudis, R. Vlastou,21 A. Wallner, T. Ware, M. Weigand, C. Weiss, T. Wright, P. Žugec
Published: 2022

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

Author: Balibrea-Correa, J., Mendoza, E., Cano Ott, Daniel, Capote Noy, Roberto, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Ludmila, Bécares, Vicente, Barbagallo, Massimo, Becvar, F., Belloni, Fabio, Berthoumieux, Eric, Billowes, J., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Universitat Politècnica de Catalunya. Departament de Física, and Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group
Subjects: Energies::Energia nuclear [Àrees temàtiques de la UPC], Física [Àrees temàtiques de la UPC], Nuclear physics, Nuclear fission, Física nuclear, Neutrons--Captura, Neutrons--Capture, Fissió nuclear
Abstract: We measured the neutron capture-to-fission cross-section ratio (a ratio) and the capture cross section of 235U between 0.2 and 200 eV at the n_TOF facility at CERN. The simultaneous measurement of neutron-induced capture and fission rates was performed by means of the n_TOF BaF2 Total Absorption Calorimeter (TAC), used for detection of ¿ rays, in combination with a set of micromegas detectors used as fission tagging detectors. The energy dependence of the capture cross section was obtained with help of the 6 Li(n,t) standard reaction determining the n_TOF neutron fluence; the well-known integral of the 235U(n, f ) cross section between 7.8 and 11 eV was then used for its absolute normalization. The a ratio, obtained with slightly higher statistical fluctuations, was determined directly, without need for any reference cross section. To perform the analysis of this measurement we developed a new methodology to correct the experimentally observed effect that the probabilities of detecting a fission reaction in the TAC and the micromegas detectors are not independent. The results of this work have been used in a new evaluation of 235U performed within the scope of the Collaborative International Evaluated Library Organisation (CIELO) Project, and are consistent with the ENDF/B-VIII.0 and JEFF-3.3 capture cross sections below 4 eV and above 100 eV. However, the measured capture cross section is on average 10% larger between 4 and 100 eV
Published: 2020

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

Author: Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Balibrea-Correa, J., Mendoza, E., Cano Ott, Daniel, Capote Noy, Roberto, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Ludmila, Bécares, Vicente, Barbagallo, Massimo, Becvar, F., Belloni, Fabio, Berthoumieux, Eric, Billowes, J., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Balibrea-Correa, J., Mendoza, E., Cano Ott, Daniel, Capote Noy, Roberto, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Ludmila, Bécares, Vicente, Barbagallo, Massimo, Becvar, F., Belloni, Fabio, Berthoumieux, Eric, Billowes, J., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, and Gómez Hornillos, María Belén
Abstract: We measured the neutron capture-to-fission cross-section ratio (a ratio) and the capture cross section of 235U between 0.2 and 200 eV at the n_TOF facility at CERN. The simultaneous measurement of neutron-induced capture and fission rates was performed by means of the n_TOF BaF2 Total Absorption Calorimeter (TAC), used for detection of ¿ rays, in combination with a set of micromegas detectors used as fission tagging detectors. The energy dependence of the capture cross section was obtained with help of the 6 Li(n,t) standard reaction determining the n_TOF neutron fluence; the well-known integral of the 235U(n, f ) cross section between 7.8 and 11 eV was then used for its absolute normalization. The a ratio, obtained with slightly higher statistical fluctuations, was determined directly, without need for any reference cross section. To perform the analysis of this measurement we developed a new methodology to correct the experimentally observed effect that the probabilities of detecting a fission reaction in the TAC and the micromegas detectors are not independent. The results of this work have been used in a new evaluation of 235U performed within the scope of the Collaborative International Evaluated Library Organisation (CIELO) Project, and are consistent with the ENDF/B-VIII.0 and JEFF-3.3 capture cross sections below 4 eV and above 100 eV. However, the measured capture cross section is on average 10% larger between 4 and 100 eV, Postprint (published version)
Published: 2020

6. Measurement and resonance analysis of the 33S (n, alpha) 30Si cross section at the CERN n_TOF facility in the energy region from 10 to 300 keV

Author: Praena, J., Sabaté-Gilarte, M., Porras, I., Calviño Tavares, Francisco|||0000-0002-7198-4639, Cortés Rossell, Guillem Pere|||0000-0002-3648-5826, Gómez Hornillos, María Belén, Universitat Politècnica de Catalunya. Departament de Física, and Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group
Subjects: Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, Cross section, nTOF, CERN, Física::Física de partícules [Àrees temàtiques de la UPC], Nuclear physics, Física nuclear, Neutron, Nuclear reaction, Neutrons--Captura, Neutron-capture therapy, Neutrons--Capture
Abstract: The 33S(n,a)30Si cross section has been measured at the neutron time-of-flight (n_TOF) facility at CERN in the neutron energy range from 10 to 300 keV relative to the 10B(n,a)7Li cross-section standard. Both reactions were measured simultaneously with a set of micromegas detectors. The flight path of 185 m has allowed us to obtain the cross section with high-energy resolution. An accurate description of the resonances has been performed by means of the multilevel multichannel R-matrix code SAMMY. The results show a significantly higher area of the biggest resonance (13.45 keV) than the unique high-resolution (n,a) measurement. The new parametrization of the 13.45-keV resonance is similar to that of the unique transmission measurement. This resonance is a matter of research in neutron-capture therapy. The 33S(n,a)30Si cross section has been studied in previous works because of its role in the production of 36S in stars, which is currently overproduced in stellar models compared to observations.
Published: 2018

7. Measurement and resonance analysis of the 33S (n, alpha) 30Si cross section at the CERN n_TOF facility in the energy region from 10 to 300 keV

Author: Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Praena, J., Sabaté-Gilarte, M., Porras, I., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Praena, J., Sabaté-Gilarte, M., Porras, I., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, and Gómez Hornillos, María Belén
Abstract: The 33S(n,a)30Si cross section has been measured at the neutron time-of-flight (n_TOF) facility at CERN in the neutron energy range from 10 to 300 keV relative to the 10B(n,a)7Li cross-section standard. Both reactions were measured simultaneously with a set of micromegas detectors. The flight path of 185 m has allowed us to obtain the cross section with high-energy resolution. An accurate description of the resonances has been performed by means of the multilevel multichannel R-matrix code SAMMY. The results show a significantly higher area of the biggest resonance (13.45 keV) than the unique high-resolution (n,a) measurement. The new parametrization of the 13.45-keV resonance is similar to that of the unique transmission measurement. This resonance is a matter of research in neutron-capture therapy. The 33S(n,a)30Si cross section has been studied in previous works because of its role in the production of 36S in stars, which is currently overproduced in stellar models compared to observations., Postprint (published version)
Published: 2018

8. Measurement of the 238 U ( n , gamma ) cross section up to 80 keV with the Total Absorption Calorimeter at the CERN n_TOF facility

Author: Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Universitat Politècnica de Catalunya. NERG - Grup de Recerca d'Enginyeria Nuclear, Wright, T., Guerrero, C., Billowes, J., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Hernández Prieto, Álvaro, Riego Pérez, Albert, Tarifeño Saldivia, Ariel Esteban, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Universitat Politècnica de Catalunya. NERG - Grup de Recerca d'Enginyeria Nuclear, Wright, T., Guerrero, C., Billowes, J., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Hernández Prieto, Álvaro, Riego Pérez, Albert, and Tarifeño Saldivia, Ariel Esteban
Abstract: The radiative capture cross section of a highly pure (99.999%), 6.125(2) grams and 9.56(5) 10-4 atoms/barn areal density 238-U sample has been measured with the Total Absorption Calorimeter (TAC) in the 185 m flight path at the CERN neutron time-of-flight facility n_TOF. This measurement is in response to the NEA High Priority Request list, which demands an accuracy in this cross section of less than 3% below 25 keV. These data have undergone careful background subtraction, with special care being given to the background originating from neutrons scattered by the 238-U sample. Pileup and dead-time effects have been corrected for. The measured cross section covers an energy range between 0.2 eV and 80 keV, with an accuracy that varies with neutron energy, being better than 4% below 25 keV and reaching at most 6% at higher energies., Postprint (published version)
Published: 2017

9. 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

10. Measurement of the 240Pu(n,f) cross-section at the CERN n_TOF facility: first results from experimental area II (EAR-2)

Author: International Conference on Nuclear Data for Science and Technology (2016 : Bruges), Stamatopoulos, Athanasios, Tsinganis, Andrea, Colonna, Nicola, Vlastou, Rosa, Kokkoris, Michael, Schillebeeckx, Peter, Plompen, Arjan J. M., Heyse, Jan, Žugec, Petar, Barbagallo, Massimo, Calviani, Marco, Berthoumieux, Eric, Chiaveri, Enrico, Aberle, Oliver, Andrzejewski, Józef, Audouin, Laurent, Bécares, Vicente, Bacak, Michael, Balibrea Correa, Javier, Barros, Susana C.C., Bečvář, František, Beinrucker, Clemens, Belloni, Fabio, Billowes, Jonathan, Boccone, Vittorio, Bosnar, Damir, Brugger, Markus, Caamaño, Manuel, Calviño Tavares, Francisco, Cano-Ott, Daniel, Cerutti, Francesco, Cortés Rossell, Guillem Pere, Cortés-Giraldo, Miguel Antonio, Cosentino, Luigi, Damone, Lucia Anna, Deo, Kapil, Diakaki, Maria, Domingo-Pardo, César, Dressler, Rugard, Dupont, Emmeric, Durán, Ignacio, Fernández Domínguez, Beatriz, Ferrari, Alfredo, Ferreira, Pedro G., Finocchiaro, Paolo, Frost, Robert J. W., Furman, Valter, Göbel, Kathrin, Gómez Hornillos, María Belén, García Ríos, Aczel Regino, Gheorghe, Ioana, Glodariu, Tudor, Gonçalves, Isabel Maria Ferro, González Romero, Enrique Miguel, Goverdovski, Andrey, Griesmayer, Erich, Guerrero Sánchez, Carlos, Gunsing, Frank, Harada, Hideo, Heftrich, Tanja, Heinitz, Stephan, Hernández Prieto, Álvaro, Jenkins, David, Jericha, Erwin, Käppeler, Franz, Kadi, Yacine, Katabuchi, Tatsuya, Kavrigin, Pavel, Ketlerov, Vladimir, Khryachkov, Vitaly, Kimura, Atsushi, Kivel, Nikolay, Krtička, Milan, Leal Cidoncha, Esther, Lederer, Claudia, Leeb, Helmut, Lerendegui-Marco, Jorge, Licata, Mauro, Lo Meo, Sergio, Losito, Roberto, Macina, Daniela, Marganiec, Justyna, Martı́nez, Trinitario, Massimi, Cristian, Mastinu, Pierfrancesco, Mastromarco, Mario, Matteucci, Francesca, Mendoza Cembranos, Emilio, Mengoni, Alberto, Milazzo, Paolo Maria, Mingrone, Federica, Mirea, Mihail, Montesano, Simone, Musumarra, Agatino, Nolte, Ralf, Palomo Pinto, Francisco Rogelio, Paradela Dobarro, Carlos, Patronis, Nikolas, Pavlik, Andreas, Perkowski, Jarosław, Porras Sánchez, José Ignacio, Praena, Javier, Quesada Molina, José Manuel, Rauscher, Thomas, Reifarth, René, Riego Pérez, Albert, Robles Manzano, Maria Soledad, Rubbia, Carlo, Ryan, James, Sabaté-Gilarte, Marta, Saxena, Alok, Schmidt, Stefan, Schumann, Dorothea, Sedyshev, Pavel V., Smith, Alastair Gavin, Suryanarayana, Saraswatula Venkata, Tagliente, Giuseppe, Taı́n Enríquez, José Luis, Tarifeño-Saldivia, Ariel, Tassan-Got, Laurent, Valenta, Stanislav, Vannini, Gianni, Variale, Vincenzo, Vaz, Pedro, Ventura, Alberto, Vlachoudis, Vasilis, Wallner, Anton, Warren, Stephen J., Weigand, Mario, Weiß, Christina, Wright, Tobias, International Conference on Nuclear Data for Science and Technology (2016 : Bruges), Stamatopoulos, Athanasios, Tsinganis, Andrea, Colonna, Nicola, Vlastou, Rosa, Kokkoris, Michael, Schillebeeckx, Peter, Plompen, Arjan J. M., Heyse, Jan, Žugec, Petar, Barbagallo, Massimo, Calviani, Marco, Berthoumieux, Eric, Chiaveri, Enrico, Aberle, Oliver, Andrzejewski, Józef, Audouin, Laurent, Bécares, Vicente, Bacak, Michael, Balibrea Correa, Javier, Barros, Susana C.C., Bečvář, František, Beinrucker, Clemens, Belloni, Fabio, Billowes, Jonathan, Boccone, Vittorio, Bosnar, Damir, Brugger, Markus, Caamaño, Manuel, Calviño Tavares, Francisco, Cano-Ott, Daniel, Cerutti, Francesco, Cortés Rossell, Guillem Pere, Cortés-Giraldo, Miguel Antonio, Cosentino, Luigi, Damone, Lucia Anna, Deo, Kapil, Diakaki, Maria, Domingo-Pardo, César, Dressler, Rugard, Dupont, Emmeric, Durán, Ignacio, Fernández Domínguez, Beatriz, Ferrari, Alfredo, Ferreira, Pedro G., Finocchiaro, Paolo, Frost, Robert J. W., Furman, Valter, Göbel, Kathrin, Gómez Hornillos, María Belén, García Ríos, Aczel Regino, Gheorghe, Ioana, Glodariu, Tudor, Gonçalves, Isabel Maria Ferro, González Romero, Enrique Miguel, Goverdovski, Andrey, Griesmayer, Erich, Guerrero Sánchez, Carlos, Gunsing, Frank, Harada, Hideo, Heftrich, Tanja, Heinitz, Stephan, Hernández Prieto, Álvaro, Jenkins, David, Jericha, Erwin, Käppeler, Franz, Kadi, Yacine, Katabuchi, Tatsuya, Kavrigin, Pavel, Ketlerov, Vladimir, Khryachkov, Vitaly, Kimura, Atsushi, Kivel, Nikolay, Krtička, Milan, Leal Cidoncha, Esther, Lederer, Claudia, Leeb, Helmut, Lerendegui-Marco, Jorge, Licata, Mauro, Lo Meo, Sergio, Losito, Roberto, Macina, Daniela, Marganiec, Justyna, Martı́nez, Trinitario, Massimi, Cristian, Mastinu, Pierfrancesco, Mastromarco, Mario, Matteucci, Francesca, Mendoza Cembranos, Emilio, Mengoni, Alberto, Milazzo, Paolo Maria, Mingrone, Federica, Mirea, Mihail, Montesano, Simone, Musumarra, Agatino, Nolte, Ralf, Palomo Pinto, Francisco Rogelio, Paradela Dobarro, Carlos, Patronis, Nikolas, Pavlik, Andreas, Perkowski, Jarosław, Porras Sánchez, José Ignacio, Praena, Javier, Quesada Molina, José Manuel, Rauscher, Thomas, Reifarth, René, Riego Pérez, Albert, Robles Manzano, Maria Soledad, Rubbia, Carlo, Ryan, James, Sabaté-Gilarte, Marta, Saxena, Alok, Schmidt, Stefan, Schumann, Dorothea, Sedyshev, Pavel V., Smith, Alastair Gavin, Suryanarayana, Saraswatula Venkata, Tagliente, Giuseppe, Taı́n Enríquez, José Luis, Tarifeño-Saldivia, Ariel, Tassan-Got, Laurent, Valenta, Stanislav, Vannini, Gianni, Variale, Vincenzo, Vaz, Pedro, Ventura, Alberto, Vlachoudis, Vasilis, Wallner, Anton, Warren, Stephen J., Weigand, Mario, Weiß, Christina, and Wright, Tobias
Abstract: The accurate knowledge of the neutron-induced fission cross-sections of actinides and other isotopes involved in the nuclear fuel cycle is essential for the design of advanced nuclear systems, such as Generation-IV nuclear reactors. Such experimental data can also provide the necessary feedback for the adjustment of nuclear model parameters used in the evaluation process, resulting in the further development of nuclear fission models. In the present work, the 240Pu(n,f) cross-section was measured at CERN's n_TOF facility relative to the well-known 235U(n,f) cross section, over a wide range of neutron energies, from meV to almost MeV, using the time-of-flight technique and a set-up based on Micromegas detectors. This measurement was the first experiment to be performed at n_TOF's new experimental area (EAR-2), which offers a significantly higher neutron flux compared to the already existing experimental area (EAR-1). Preliminary results as well as the experimental procedure, including a description of the facility and the data handling and analysis, are presented.
Published: 2017

11. 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

12. Enhanced gamma-ray emission from neutron unbound states populated in beta decay

Author: Taín Enríquez, José Luis, Valencia, E., Algora, A., Rubio, B., Maurice, S., Gelletly, W., Fallot, M., Rissanen, J., Eronen, T., Äystö, J., Batist, L., Bowry, M., Caballero Folch, Roger, Gómez Hornillos, María Belén, Gorlychev, V., Mendoza, E., Moore, I., Penttila, H., Reponen, M., Sonnenschein, V., and Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group
Subjects: Competition, Física [Àrees temàtiques de la UPC], Penning trap, BR-87, education, Nuclear physics, Spectrum analysis, Total absorption-spectra, Nuclear-data sheets, Schemes, Física nuclear, Jyfltrap, Spectroscopy, Purification, Simulation
Published: 2015

13. Total absorption spectroscopy study of Rb-92 decay: a major contributor to reactor antineutrino spectrum shape

Author: Zakari-Issoufou, A.-A., Fallot, M., Porta, A., Caballero Folch, Roger, Gómez Hornillos, María Belén, Gorlychev, V., and Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group
Subjects: Física [Àrees temàtiques de la UPC], Penning Trap, Spectometer, Physics, Fission-products, Física, Beta-decay
Abstract: The antineutrino spectra measured in recent experiments at reactors are inconsistent with calculations based on the conversion of integral beta spectra recorded at the ILL reactor. Rb-92 makes the dominant contribution to the reactor antineutrino spectrum in the 5-8 MeV range but its decay properties are in question. We have studied Rb-92 decay with total absorption spectroscopy. Previously unobserved beta feeding was seen in the 4.5-5.5 region and the GS to GS feeding was found to be 87.5(25)%. The impact on the reactor antineutrino spectra calculated with the summation method is shown and discussed. The antineutrino spectra measured in recent experiments at reactors are inconsistent with calculations based on the conversion of integral beta spectra recorded at the ILL reactor. Rb-92 makes the dominant contribution to the reactor antineutrino spectrum in the 5-8 MeV range but its decay properties are in question. We have studied Rb-92 decay with total absorption spectroscopy. Previously unobserved beta feeding was seen in the 4.5-5.5 region and the GS to GS feeding was found to be 87.5(25)%. The impact on the reactor antineutrino spectra calculated with the summation method is shown and discussed.
Published: 2015
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14. Measurement of the C-12(n, p)B-12 cross section at n_TOF at CERN by in-beam activation analysis

Author: Žugec, Petar, Colonna, Nicola, Bosnar, Damir, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Riego Pérez, Albert, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, and Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions
Subjects: Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, Cross section, TOF, Neutron, Nuclear Experiment
Abstract: The integral cross section of the C-12(n,p)B-12 reaction has been determined for the first time in the neutron energy range from threshold to several GeV at the n_TOF facility at CERN. The measurement relies on the activation technique with the beta decay of B-12 measured over a period of four half-lives within the same neutron bunch in which the reaction occurs. The results indicate that model predictions, used in a variety of applications, are mostly inadequate. The value of the integral cross section reported here can be used as a benchmark for verifying or tuning model calculations.
Published: 2014

15. High precision measurement of the radiative capture cross section of 238U at the n TOF CERN facility

Author: Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Mingrone, Federica, Altstadt, Sebastian, Andrzejewski, Józef, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Riego Pérez, Albert, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Mingrone, Federica, Altstadt, Sebastian, Andrzejewski, Józef, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, and Riego Pérez, Albert
Abstract: The importance of improving the accuracy on the capture cross-section of 238U has been addressed by the Nuclear Energy Agency, since its uncertainty significantly affects the uncertainties of key design parameters for both fast and thermal nuclear reactors. Within the 7th framework programme ANDES of the European Commission three different measurements have been carried out with the aim of providing the 238U(n, gamma) cross-section with an accuracy which varies from 1 to 5%, depending on the energy range. Hereby the final results of the measurement performed at the n TOF CERN facility in a wide energy range from 1 eV to 700 keV will be presented., Postprint (published version)
Published: 2016

16. The 236U neutron capture cross-section measured at the n TOF CERN facility

Author: Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Mastromarco, M., Barbagallo, Massimo, Vermeulen, M.J., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Riego Pérez, Albert, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Mastromarco, M., Barbagallo, Massimo, Vermeulen, M.J., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, and Riego Pérez, Albert
Abstract: The 236U isotope plays an important role in nuclear systems, both for future and currently operating ones. The actual knowledge of the capture reaction of this isotope is satisfactory in the thermal region, but it is considered insufficient for Fast Reactor and ADS applications. For this reason the 236U(n, gamma ) reaction cross section has been measured for the first time in the whole energy region from thermal energy up to 1MeV at the n TOF facility with two different detection systems: an array of C6D6 detectors, employing the total energy deposited method, and a 4p total absorption calorimeter (TAC), made of 40 BaF2 crystals. The two n TOF data sets agree with each other within the statistical uncertainty in the Resolved Resonance Region up to 800 eV, while sizable differences (up to 20%) are found relative to the current evaluated data libraries. Moreover two new resonances have been found in the n TOF data. In the Unresolved Resonance Region up to 200 keV, the n TOF results show a reasonable agreement with previous measurements and evaluated data., Postprint (published version)
Published: 2016

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

Author: Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Balibrea-Correa, J., Mendoza, E., Cano-Ott, D, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Riego Pérez, Albert, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Balibrea-Correa, J., Mendoza, E., Cano-Ott, D, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, and Riego Pérez, Albert
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., Postprint (published version)
Published: 2016

18. New measurement of the 242Pu(n,gamma) cross section at n TOF-EAR1 for MOX fuels: Preliminary results in the RRR

Author: Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Lerendegui-Marco, J., Guerrero, C., Cortés-Giraldo, M.A., Calviño Tavares, Francisco, Casanovas Hoste, Adrià, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Tarifeño Saldivia, Ariel Esteban, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Lerendegui-Marco, J., Guerrero, C., Cortés-Giraldo, M.A., Calviño Tavares, Francisco, Casanovas Hoste, Adrià, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, and Tarifeño Saldivia, Ariel Esteban
Abstract: The spent fuel of current nuclear reactors contains fissile plutonium isotopes that can be combined with 238U to make mixed oxide (MOX) fuel. In this way the Pu from spent fuel is used in a new reactor cycle, contributing to the long-term sustainability of nuclear energy. The use of MOX fuels in thermal and fast reactors requires accurate capture and fission cross sections. For the particular case of 242Pu, the previous neutron capture cross section measurements were made in the 70’s, providing an uncertainty of about 35% in the keV region. In this context, the Nuclear Energy Agency recommends in its “High Priority Request List” and its report WPEC-26 that the capture cross section of 242Pu should be measured with an accuracy of at least 7–12% in the neutron energy range between 500 eV and 500 keV. This work presents a brief description of the measurement performed at n TOF-EAR1, the data reduction process and the first ToF capture measurement on this isotope in the last 40 years, providing preliminary individual resonance parameters beyond the current energy limits in the evaluations, as well as a preliminary set of average resonance parameters., Postprint (published version)
Published: 2016

19. 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

20. Measurement of the 241Am neutron capture cross section at the n TOF facility at CERN

Author: Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Mendoza, E., Cano-Ott, D, Altstadt, Sebastian, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Riego Pérez, Albert, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Mendoza, E., Cano-Ott, D, Altstadt, Sebastian, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, and Riego Pérez, Albert
Abstract: New neutron cross section measurements of minor actinides have been performed recently in order to reduce the uncertainties in the evaluated data, which is important for the design of advanced nuclear reactors and, in particular, for determining their performance in the transmutation of nuclear waste.We have measured the 241Am(n,gamma ) cross section at the n TOF facility between 0.2 eV and 10 keV with a BaF2 Total Absorption Calorimeter, and the analysis of the measurement has been recently concluded. Our results are in reasonable agreement below 20 eV with the ones published by C. Lampoudis et al. in 2013, who reported a 22% larger capture cross section up to 110 eV compared to experimental and evaluated data published before. Our results also indicate that the 241Am(n,gamma ) cross section is underestimated in the present evaluated libraries between 20 eV and 2 keV by 25%, on average, and up to 35% for certain evaluations and energy ranges., Postprint (published version)
Published: 2016

21. Integral measurement of the 12C(n, p)12B reaction up to 10 GeV

Author: Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Žugec, Petar, Colonna, Nicola, Bosnar, Damir, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Žugec, Petar, Colonna, Nicola, Bosnar, Damir, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, and Gómez Hornillos, María Belén
Abstract: The integral measurement of the 12C(n, p)12B reaction was performed at the neutron time-offlight facility n TOF at CERN. The total number of 12B nuclei produced per neutron pulse of the n TOF beam was determined using the activation technique in combination with a time-of-flight technique. The cross section is integrated over the n TOF neutron energy spectrum from reaction threshold at 13.6MeV to 10 GeV. Having been measured up to 1 GeV on basis of the 235U(n, f) reaction, the neutron energy spectrum above 200MeV has been re-evaluated due to the recent extension of the cross section reference for this particular reaction, which is otherwise considered a standard up to 200MeV. The results from the dedicated GEANT4 simulations have been used to evaluate the neutron flux from 1 GeV up to 10 GeV. The experimental results related to the 12C(n, p)12B reaction are compared with the evaluated cross sections from major libraries and with the predictions of different GEANT4 models, which mostly underestimate the 12B production. On the contrary, a good reproduction of the integral cross section derived from measurements is obtained with TALYS-1.6 calculations, with optimized parameters., Postprint (published version)
Published: 2016

22. Characterization of a neutron-beta counting system with beta-delayed neutron emitters

Author: Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Universitat Politècnica de Catalunya. NERG - Grup de Recerca d'Enginyeria Nuclear, Agramunt Ros, Jorge, Taín Enríquez, José Luis, Gómez Hornillos, María Belén, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Pretel Sánchez, Carme, Riego Pérez, Albert, Tarifeño Saldivia, Ariel Esteban, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Universitat Politècnica de Catalunya. NERG - Grup de Recerca d'Enginyeria Nuclear, Agramunt Ros, Jorge, Taín Enríquez, José Luis, Gómez Hornillos, María Belén, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Pretel Sánchez, Carme, Riego Pérez, Albert, and Tarifeño Saldivia, Ariel Esteban
Abstract: A new detection system for the measurement of beta-delayed neutron emission probabilities has been characterized using fission products with well known ß-delayed neutron emission properties. The setup consists of BELEN-20, a 4p neutron counter with twenty 3He proportional tubes arranged inside a large polyethylene neutron moderator, a thin Si detector for ß counting and a self-triggering digital data acquisition system. The use of delayed-neutron precursors with different neutron emission windows allowed the study of the effect of energy dependency on neutron, ß and ß-neutron rates. The observed effect is well reproduced by Monte Carlo simulations. The impact of this dependency on the accuracy of neutron emission probabilities is discussed. A new accurate value of the neutron emission probability for the important delayed-neutron precursor 137I was obtained, Pn=7.76(14)%., Postprint (author's final draft)
Published: 2016

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

Author: Lederer, Claudia, Massimi, Cristian, Berthoumieux, Eric, Colonna, Nicola, Dressler, Rugard, Guerrero, Carlos, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Riego Pérez, Albert, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, and Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions
Subjects: Energies::Energia nuclear [Àrees temàtiques de la UPC], Física [Àrees temàtiques de la UPC], Astrophysics::High Energy Astrophysical Phenomena, Energia nuclear, Nuclear energy, Física nuclear, Nuclear Experiment
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 n_TOF at CERN. Capture kernels of 42 resonances were analyzed up to 200 keV neutron energy and Maxwellian averaged cross sections (MACS) from kT = 5-100 keV were calculated. With a total uncertainty of 4.5%, the stellar cross section is in excellent agreement with the the KADoNiS compilation at kT = 30 keV, while being systematically lower up to a factor of 1.6 at higher stellar temperatures. The cross section of the Ni-63(n,gamma) reaction was measured for the first time at n_TOF. We determined unresolved cross sections from 10 to 270 keV with a systematic uncertainty of 17%. These results provide fundamental constraints on s-process production of heavier species, especially the production of Cu in massive stars, which serve as the dominant source of Cu in the solar system.
Published: 2014

24. Measurement and analysis of the Am 241 (n, gamma) cross section with liquid scintillator detectors using time-of-flight spectroscopy at the n-TOF facility at CERN

Author: Fraval, Kevin, Gunsing, Frank, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Ludmila, Barbagallo, Massimo, Bécares, Vicente, Belloni, Fabio, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Hernández Prieto, Álvaro, Riego Pérez, Albert, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, and Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions
Subjects: Energies::Energia nuclear [Àrees temàtiques de la UPC], Energia nuclear, Nuclear energy
Abstract: The Am241(n,¿) cross section has been measured at the n-TOF facility at CERN using deuterated benzene liquid scintillators, commonly known as C6D6 detectors, and time-of-flight spectrometry. The results in the resolved resonance range bring new constraints to evaluations below 150 eV, and the energy upper limit was extended from 150 to 320 eV with a total of 172 new resonances not present in current evaluations. The thermal capture cross section was found to be sth=678±68 b, which is in good agreement with evaluations and most previous measurements. The capture cross section in the unresolved resonance region was extracted in the remaining energy range up to 150 keV, and found to be larger than current evaluations and previous measurements. © 2014 American Physical Society.
Published: 2014

25. Neutron capture cross section of unstable 63-Ni: implications for stellar nucleosynthesis

Author: Lederer, C., Massimi, C., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, and Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions
Subjects: Thermal neutrons, Energies::Energia nuclear [Àrees temàtiques de la UPC], Astrophysics::High Energy Astrophysical Phenomena, Física::Astronomia i astrofísica [Àrees temàtiques de la UPC], Energia tèrmica solar, Astrophysics, Astrophysics::Galaxy Astrophysics, Astrofísica -- Sistema solar
Abstract: The 63Ni(n,γ) 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⊙ star show that the new data have a significant effect on the s-process production of 63Cu, 64Ni, and 64Zn in massive stars, allowing stronger constraints on the Cu yields from explosive nucleosynthesis in the subsequent supernova.
Published: 2013

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

Author: Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Universitat Politècnica de Catalunya. NERG - Grup de Recerca d'Enginyeria Nuclear, Paradela, C., Calviani, Marco, Tarrío, D., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Pretel Sánchez, Carme, Riego Pérez, Albert, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Universitat Politècnica de Catalunya. NERG - Grup de Recerca d'Enginyeria Nuclear, Paradela, C., Calviani, Marco, Tarrío, D., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Pretel Sánchez, Carme, and Riego Pérez, Albert
Abstract: The U238 to U235 fission cross section ratio has been determined at n_TOF up to ˜1 GeV, with two different detection systems, in different geometrical configurations. A total of four datasets has been collected and compared. They are all consistent to each other within the relative systematic uncertainty of 3–4%. The data collected at n_TOF have been suitably combined to yield a unique fission cross section ratio as a function of neutron energy. The result confirms current evaluations up to 200 MeV. Good agreement is also observed with theoretical calculations based on the INCL++/Gemini++ combination up to the highest measured energy. The n_TOF results may help solve a long-standing discrepancy between the two most important experimental datasets available so far above 20 MeV, while extending the neutron energy range for the first time up to ˜1 GeV., Postprint (published version)
Published: 2015

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

Author: Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Diakaki, M., Audouin, Ludmila, Berthoumieux, Eric, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Pretel Sánchez, Carme, Riego Pérez, Albert, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Diakaki, M., Audouin, Ludmila, Berthoumieux, Eric, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Pretel Sánchez, Carme, and Riego Pérez, Albert
Abstract: The 238U fission cross section is an international standard beyond 2 MeV where the fission plateau starts. However, due to its importance in fission reactors, this cross-section should be very accurately known also in the threshold region below 2 MeV. The 238U fission cross section has been measured relative to the 235U fission cross section at CERN – n_TOF with different detection systems. These datasets have been collected and suitably combined to increase the counting statistics in the threshold region from about 300 keV up to 3 MeV. The results are compared with other experimental data, evaluated libraries, and the IAEA standards, Postprint (published version)
Published: 2015

28. 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

29. Enhanced gamma-ray emission from neutron unbound states populated in beta decay

Author: Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Taín Enríquez, José Luis, Valencia, E., Algora, A., Rubio, B., Maurice, S., Gelletly, W., Fallot, M., Rissanen, J., Eronen, T., Äystö, J., Batist, L., Bowry, M., Caballero Folch, Roger, Gómez Hornillos, María Belén, Gorlychev, V., Mendoza, E., Moore, I., Penttila, H., Reponen, M., Sonnenschein, V., Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Taín Enríquez, José Luis, Valencia, E., Algora, A., Rubio, B., Maurice, S., Gelletly, W., Fallot, M., Rissanen, J., Eronen, T., Äystö, J., Batist, L., Bowry, M., Caballero Folch, Roger, Gómez Hornillos, María Belén, Gorlychev, V., Mendoza, E., Moore, I., Penttila, H., Reponen, M., and Sonnenschein, V.
Abstract: Peer Reviewed, Postprint (published version)
Published: 2015

30. Total absorption spectroscopy study of Rb-92 decay: a major contributor to reactor antineutrino spectrum shape

Author: Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Zakari-Issoufou, A.-A., Fallot, M., Porta, A., Caballero Folch, Roger, Gómez Hornillos, María Belén, Gorlychev, V., Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Zakari-Issoufou, A.-A., Fallot, M., Porta, A., Caballero Folch, Roger, Gómez Hornillos, María Belén, and Gorlychev, V.
Abstract: The antineutrino spectra measured in recent experiments at reactors are inconsistent with calculations based on the conversion of integral beta spectra recorded at the ILL reactor. Rb-92 makes the dominant contribution to the reactor antineutrino spectrum in the 5-8 MeV range but its decay properties are in question. We have studied Rb-92 decay with total absorption spectroscopy. Previously unobserved beta feeding was seen in the 4.5-5.5 region and the GS to GS feeding was found to be 87.5(25)%. The impact on the reactor antineutrino spectra calculated with the summation method is shown and discussed., The antineutrino spectra measured in recent experiments at reactors are inconsistent with calculations based on the conversion of integral beta spectra recorded at the ILL reactor. Rb-92 makes the dominant contribution to the reactor antineutrino spectrum in the 5-8 MeV range but its decay properties are in question. We have studied Rb-92 decay with total absorption spectroscopy. Previously unobserved beta feeding was seen in the 4.5-5.5 region and the GS to GS feeding was found to be 87.5(25)%. The impact on the reactor antineutrino spectra calculated with the summation method is shown and discussed., Peer Reviewed, Postprint (published version)
Published: 2015

31. Erratum: 62Ni(n,¿) and 63Ni(n,¿ ) cross sections measured at the n_TOF facility at CERN

Author: Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Universitat Politècnica de Catalunya. NERG - Grup de Recerca d'Enginyeria Nuclear, Lederer, Claudia, Massimi, Cristian, Berthoumieux, Eric, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Riego Pérez, Albert, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Universitat Politècnica de Catalunya. NERG - Grup de Recerca d'Enginyeria Nuclear, Lederer, Claudia, Massimi, Cristian, Berthoumieux, Eric, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, and Riego Pérez, Albert
Abstract: Postprint (published version)
Published: 2015

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

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

33. Commissionning of the n_TOF-Ph2 facility

Author: Calviño Tavares, Francisco|||0000-0002-7198-4639, Cortés Rossell, Guillem Pere|||0000-0002-3648-5826, Gómez Hornillos, María Belén, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, and Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions
Subjects: Neutron beams, Astrophysics::High Energy Astrophysical Phenomena, Física::Astronomia i astrofísica [Àrees temàtiques de la UPC], Nuclear Theory, Neutrons ràpids, Physics::Accelerator Physics, Neutrons -- Mesurament, Nuclear Experiment, Neutrons--Measurement
Abstract: The white spectrum neutron time-of-flight facility n_TOF is operating at CERN since 2001. The neutron beam has a very high instantaneous flux and high resolution in energy and it is delivered in the experimental area located 187 m downstream from the spallation target. The intense neutron fluence per proton burst results in a much enhanced signal to background ratio for neutron capture and fission reactions on radioactive isotopes, thus making the facility well suited for accurate measurement of neutron-induced reaction cross-sections. This is especially true to highly radioactive targets which are of major importance in new nuclear energy system such as Gen-IV reactors, especially those with fast spectrum. Combined with state-of-the-art detectors and with advanced data acquisition systems, the innovative characteristics of the n_TOF neutron beam allow collecting data on a variety of stable and radioactive isotopes of interest for nuclear astrophysics and for applications to advanced reactor technologies.
Published: 2010

34. New measurement of the astrophysically important reaction 62Ni(n,gamma) at n-TOF

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

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

Author: Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Zugec, P., Barbagallo, M., Colonna, Nicola, Bosnar, D., Altstadt, S., Andrzejewski, J., Audouin, L., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Riego Pérez, Albert, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Zugec, P., Barbagallo, M., Colonna, Nicola, Bosnar, D., Altstadt, S., Andrzejewski, J., Audouin, L., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, and Riego Pérez, Albert
Abstract: Postprint (published version)
Published: 2014

36. The CERN n TOF facility: neutron beams performances for cross section measurements

Author: Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Ludmila, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Hernández Prieto, Álvaro, Riego Pérez, Albert, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Ludmila, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Hernández Prieto, Álvaro, and Riego Pérez, Albert
Abstract: This paper presents the characteristics of the existing CERN n TOF neutron beam facility (n TOF-EAR1 with a flight path of 185 meters) and the future one (n TOF EAR-2 with a flight path of 19 meters), which will operate in parallel from Summer 2014. The new neutron beam will provide a 25 times higher neutron flux delivered in 10 times shorter neutron pulses, thus offering more powerful capabilities for measuring small mass, low cross section and/or high activity samples., Postprint (published version)
Published: 2014

37. Measurement and analysis of the Am 241 (n, gamma) cross section with liquid scintillator detectors using time-of-flight spectroscopy at the n-TOF facility at CERN

Author: Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Fraval, Kevin, Gunsing, Frank, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Ludmila, Barbagallo, Massimo, Bécares, Vicente, Belloni, Fabio, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Hernández Prieto, Álvaro, Riego Pérez, Albert, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Fraval, Kevin, Gunsing, Frank, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Ludmila, Barbagallo, Massimo, Bécares, Vicente, Belloni, Fabio, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Hernández Prieto, Álvaro, and Riego Pérez, Albert
Abstract: The Am241(n,¿) cross section has been measured at the n-TOF facility at CERN using deuterated benzene liquid scintillators, commonly known as C6D6 detectors, and time-of-flight spectrometry. The results in the resolved resonance range bring new constraints to evaluations below 150 eV, and the energy upper limit was extended from 150 to 320 eV with a total of 172 new resonances not present in current evaluations. The thermal capture cross section was found to be sth=678±68 b, which is in good agreement with evaluations and most previous measurements. The capture cross section in the unresolved resonance region was extracted in the remaining energy range up to 150 keV, and found to be larger than current evaluations and previous measurements. © 2014 American Physical Society., Postprint (published version)
Published: 2014

38. ß-delayed neutron emission studies

Author: Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Gómez Hornillos, María Belén, Taín Enríquez, José Luis, Gorlychev, V., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Pretel Sánchez, Carme, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Gómez Hornillos, María Belén, Taín Enríquez, José Luis, Gorlychev, V., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, and Pretel Sánchez, Carme
Abstract: The study of beta-delayed neutron emission plays a major role in different fields such as nuclear technology, nuclear astrophysics and nuclear structure. However the quality of the existing experimental data nowadays is not sufficient for the various technical and scientific applications and new high precision measurements are necessary to improve the data bases. One key aspect to the success of these high precission measurements is the use of a very pure ion beam that ensures that only the ion of interest is produced. The combination of the IGISOL mass separator with the JYFLTRAP Penning trap is an excellent tool for this type of measurement because of the ability to deliver isobarically and even isomerically clean beams. Another key feature of the installation is the non-chemical selectivity of the IGISOL ion source which allows measurements in the important region of refractory elements. This paper summarises the beta-delayed neutron emission studies that have been carried out at the IGISOL facility with two different neutron detectors based on 3He counters in a polyethylene moderator: the Mainz neutron detector and the BEta deLayEd Neutron detector., Postprint (published version)
Published: 2014

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

Author: Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Weiß, C., Griesmayer, E., Andrzejewski, Józef, Badurek, G., Dressler, Rugard, Koehler, Paul E., Lederer, Claudia, Altstadt, Sebastian, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Riego Pérez, Albert, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Weiß, C., Griesmayer, E., Andrzejewski, Józef, Badurek, G., Dressler, Rugard, Koehler, Paul E., Lederer, Claudia, Altstadt, Sebastian, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, and Riego Pérez, Albert
Abstract: The (n,alpha) reaction in the radioactive 59Ni is of relevance in nuclear astrophysics as 59Ni can be considered as the first branching point in the astrophysical s-process. Its relevance in nuclear technology is especially related to material embrittlement in stainless steel. However, there is a discrepancy between available experimental data and the evaluated nuclear data files for this reaction. At the n TOF facility at CERN, a dedicated system based on sCVD diamond diodes was set up to measure the 59Ni(n,alpha)56Fe cross section. The results of this measurement, with special emphasis on the dominant resonance at 203 eV, are presented here., Postprint (published version)
Published: 2014

40. Measurement and analysis of 241Am(n,¿) cross sections with C6D6 detectors at the n TOF facility at CERN

Author: Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Fraval, Kevin, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Ludmila, Barbagallo, Massimo, Bécares, Vicente, Becvar, F., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Riego Pérez, Albert, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Fraval, Kevin, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Ludmila, Barbagallo, Massimo, Bécares, Vicente, Becvar, F., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, and Riego Pérez, Albert
Abstract: The 241Am(n,¿) cross sections have been measured at the n TOF facility at CERN using C6D6 liquid scintillators and time of flight spectrometry. The results in the resolved resonance range bring new constraints to evaluations below 150 eV, and the energy upper limit can be extended from 150 eV to 320 eV. The analysis goes from thermal energy to 150 keV, and the unresolved resonance range cross section turns out to be larger than expected by evaluations or otherwise measured by previous works. The thermal cross section is found to be sth = 740 ± 74 barns, which is larger than expected by evaluations and most previous measurements., Postprint (published version)
Published: 2014

41. Neutron capture reactions on Fe and Ni isotopes for the astrophysical s-process

Author: Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Lederer, Claudia, Massimi, Cristian, Žugec, Petar, Barbagallo, Massimo, Colonna, Nicola, Domingo Pardo, César, Gunsing, Frank, Taín Enríquez, José Luis, Altstadt, Sebastian, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Riego Pérez, Albert, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Lederer, Claudia, Massimi, Cristian, Žugec, Petar, Barbagallo, Massimo, Colonna, Nicola, Domingo Pardo, César, Gunsing, Frank, Taín Enríquez, José Luis, Altstadt, Sebastian, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, and Riego Pérez, Albert
Abstract: Neutron capture cross sections in the keV neutron energy region are the key nuclear physics input to study the astrophysical slow neutron capture process. In the past years, a series of neutron capture cross section measurements has been performed at the neutron time-of-flight facility n TOF at CERN focussing on the Fe/Ni mass region. Recent results and future developments in the neutron time-of-flight technique are discussed., Postprint (published version)
Published: 2014

42. A Micromegas detector for neutron beam imaging at the n TOF facility at CERN

Author: Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Belloni, Fabio, Andriamonje, S., Berthoumieux, Eric, Calviani, Marco, Colonna, Nicola, Gunsing, Frank, Tsinganis, A., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Riego Pérez, Albert, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Belloni, Fabio, Andriamonje, S., Berthoumieux, Eric, Calviani, Marco, Colonna, Nicola, Gunsing, Frank, Tsinganis, A., Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, and Riego Pérez, Albert
Abstract: Micromegas (Micro-MEsh Gaseous Structure) detectors are gas detectors consisting of a stack of one ionization and one proportional chamber. A micromesh separates the two communicating regions, where two different electric fields establish respectively a charge drift and a charge multiplication regime. The n TOF facility at CERN provides a white neutron beam (from thermal up to GeV neutrons) for neutron induced cross section measurements. These measurements need a perfect knowledge of the incident neutron beam, in particular regarding its spatial profile. A position sensitive micromegas detector equipped with a 10B based neutron/charged particle converter has been extensively used at the n TOF facility for characterizing the neutron beam profile and extracting the beam interception factor for samples of different size. The boron converter allowed to scan the energy region of interest for neutron induced capture reactions as a function of the neutron energy, determined by the time of flight. Experimental results will be presented and compared to simulations, performed by means of the FLUKA code., Postprint (published version)
Published: 2014

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

Author: Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Žugec, Petar, Colonna, Nicola, Bosnar, Damir, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Riego Pérez, Albert, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Žugec, Petar, Colonna, Nicola, Bosnar, Damir, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, and Riego Pérez, Albert
Abstract: The integral cross section of the C-12(n,p)B-12 reaction has been determined for the first time in the neutron energy range from threshold to several GeV at the n_TOF facility at CERN. The measurement relies on the activation technique with the beta decay of B-12 measured over a period of four half-lives within the same neutron bunch in which the reaction occurs. The results indicate that model predictions, used in a variety of applications, are mostly inadequate. The value of the integral cross section reported here can be used as a benchmark for verifying or tuning model calculations., Postprint (published version)
Published: 2014

44. Measurement of the 241Am and the 243Am neutron capture cross sections at the n TOF facility at CERN

Author: Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Ludmila, Barbagallo, Massimo, Bécares, Vicente, Becvar, F., Berthoumieux, Eric, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Riego Pérez, Albert, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Ludmila, Barbagallo, Massimo, Bécares, Vicente, Becvar, F., Berthoumieux, Eric, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, and Riego Pérez, Albert
Abstract: The capture cross sections of 241Am and 243Am were measured at the n TOF facility at CERN in the epithermal energy range with a BaF2 Total Absorption Calorimeter. A preliminary analysis of the 241Am and a complete analysis of the 243Am measurement, including the data reduction and the resonance analysis, have been performed., Postprint (published version)
Published: 2014

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

Author: Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Äystö, J., Caballero Folch, Roger, Calviño Tavares, Francisco, Eronen, T., Gelletly, W., Gómez Hornillos, María Belén, Moore, I., Penttila, H., Reponen, M., Riego Pérez, Albert, Rissanen, J., Rubio, B., Valencia, E., Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Äystö, J., Caballero Folch, Roger, Calviño Tavares, Francisco, Eronen, T., Gelletly, W., Gómez Hornillos, María Belén, Moore, I., Penttila, H., Reponen, M., Riego Pérez, Albert, Rissanen, J., Rubio, B., and Valencia, E.
Abstract: A new accurate determination of beta-delayed neutron emission probabilities from nuclei in the low mass region of the light fission group has been performed. The measurements were carried out using the BELEN 4 pi neutron counter at the IGISOL-JYFL mass separator in combination with a Penning trap. The new results significantly improve the uncertainties of neutron emission probabilities for Br-91, As-86, As-85, and Ge-85 nuclei., Postprint (published version)
Published: 2014

46. ß-decay and ß-delayed neutron emission measurements at GSI-FRS Beyond N=126, for r-process nucleosynthesis

Author: Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Caballero Folch, Roger, Benlliure, J., Cortés Rossell, Guillem Pere, Bowry, M., Calviño Tavares, Francisco, Dillmann, I., Estradé, A., Farinon, F., Geissel, H., Gelletly, W., Gómez Hornillos, María Belén, Heil, M., Nociforo, C., Kurcewicz, J., Marganiec, J., Paradela, C., Pietri, S., Prochazka, A., Maurice, S., Riego Pérez, Albert, Rubio, B., Weick, H., Smith, K.M, Woody, R.W., 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, Caballero Folch, Roger, Benlliure, J., Cortés Rossell, Guillem Pere, Bowry, M., Calviño Tavares, Francisco, Dillmann, I., Estradé, A., Farinon, F., Geissel, H., Gelletly, W., Gómez Hornillos, María Belén, Heil, M., Nociforo, C., Kurcewicz, J., Marganiec, J., Paradela, C., Pietri, S., Prochazka, A., Maurice, S., Riego Pérez, Albert, Rubio, B., Weick, H., Smith, K.M, and Woody, R.W.
Abstract: New measurements of very exotic nuclei in the neutron-rich region beyond N=126 have been performed at the GSI facility with the fragment separator (FRS). The aim of the experiment is to determine half-lives and beta-delayed neutron emission branching ratios of isotopes of Hg, Tl and Pb in this region. This contribution summarizes final counting statistics for identification and for implantation, as well as the present status of the data analysis of the half-lives. In summary, isotopes of Pt, Au, Hg, Ti, Pb, Bi, Po, At, Rn and Fr were clearly identified and several of them (Hg208-211, Tl211-215, Pb214-218) were implanted with enough statistics to determine their half-lives. About half of them are expected to be neutron emitters, in such cases it will become possible to obtain the neutron emission probabilities, P-n., Postprint (published version)
Published: 2014

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

Author: Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Žugec, Petar, Colonna, Nicola, Bosnar, Damir, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Riego Pérez, Albert, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Žugec, Petar, Colonna, Nicola, Bosnar, Damir, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, and Riego Pérez, Albert
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 nat-C sample, showing an excellent agreement above 1 keV. At lower energies, an additional component in the measured nat-C yield has been discovered, which prevents the use of nat-C 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, Postprint (published version)
Published: 2014

48. 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

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

Author: Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Universitat Politècnica de Catalunya. NERG - Grup de Recerca d'Enginyeria Nuclear, Tarrío, D., Audouin, Ludmila, Altstadt, Sebastian, Andrzejewski, Józef, Barbagallo, Massimo, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Riego Pérez, Albert, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Universitat Politècnica de Catalunya. NERG - Grup de Recerca d'Enginyeria Nuclear, Tarrío, D., Audouin, Ludmila, Altstadt, Sebastian, Andrzejewski, Józef, Barbagallo, Massimo, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, and Riego Pérez, Albert
Abstract: A fission reaction chamber based on Parallel Plate Avalanche Counters (PPACs) was built for measuring angular distributions of fragments emitted in neutron-induced fission of actinides at the neutron beam available at the Neutron Time-Of-Flight (n_TOF) facility at CERN. The detectors and the samples were tilted 45° with respect to the neutron beam direction to cover all the possible values of the emission angle of the fission fragments. The main features of this setup are discussed and results on the fission fragment angular distribution are provided for the 232Th(n,f) reaction around the fission threshold. The results are compared with the available data in the literature, demonstrating the good capabilities of this setup, Postprint (published version)
Published: 2014

50. Measurement of the 54,57Fe(n,gamma) cross section in the resolved resonance region at CERN n TOF

Author: Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Taín Enríquez, José Luis, Lederer, Claudia, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Ludmila, Barbagallo, Massimo, Bécares, Vicente, Becvar, F., Belloni, Fabio, Berthoumieux, Eric, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Riego Pérez, Albert, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Taín Enríquez, José Luis, Lederer, Claudia, Altstadt, Sebastian, Andrzejewski, Józef, Audouin, Ludmila, Barbagallo, Massimo, Bécares, Vicente, Becvar, F., Belloni, Fabio, Berthoumieux, Eric, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, and Riego Pérez, Albert
Abstract: 54Fe and 57 Fe are stable iron isotopes, which play an important role in the nucleosynthesis of the slow neutron capture process (s process). In addition, these nuclei are present in many structural materials, and therefore, the knowledge of their neutron capture cross sections is of importance for reactor design studies. This contribution summarizes the results of the (n, gamma) cross sections of these two isotopes in the resolved resonance region. The experiment was carried out at the CERN n TOF facility using the Pulse-Height Weighting Technique in combination with an experimental set-up optimized for reducing neutron induced backgrounds., Postprint (published version)
Published: 2014

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