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Your search keyword '"Frais-Koelbl H"' showing total 12 results
Start Over Author "Frais-Koelbl H" Topic nuclear physics - experiment
12 results on '"Frais-Koelbl H"'

1. Neutron-induced fission cross section of Np237 in the keV to MeV range at the CERN n_TOF facility

Author

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

Subjects
Nuclear Physics - Experiment, Nuclear Experiment
Abstract

The neutron-induced fission cross section of Np237 was experimentally determined at the high-resolution and high-intensity facility n_TOF, at CERN, in the energy range 100 keV to 9 MeV, using the U235(n,f) and U238(n,f) cross section standards below and above 2 MeV, respectively. A fast ionization chamber was used in order to detect the fission fragments from the reactions and the targets were characterized as far as their mass and homogeneity are concerned by means of α spectroscopy and Rutherford backscattering spectroscopy respectively. Theoretical calculations within the Hauser-Feshbach formalism have been performed, employing the empire code, and the model parameters were tuned in order to successfully reproduce the experimental fission cross-sectional data and simultaneously all the competing reaction channels.

Published
2016

2. Measurement and analysis of the Am-243 neutron capture cross section at the n_TOF facility at CERN

Author

TOF Collaboration, Mendoza, E., Cano-Ott, D., Guerrero, C., Berthoumieux, E., Abbondanno, U., Aerts, G., Alvarez-Velarde, F., Andriamonje, S., Andrzejewski, J., Assimakopoulos, P., Audouin, L., Badurek, G., Balibrea, J., Baumann, P., Becvar, F., Belloni, F., Calvino, F., Calviani, M., Capote, R., Carrapico, C., de Albornoz, A. Carrillo, Cennini, P., Chepel, V., Chiaveri, E., Colonna, N., Cortes, G., Couture, A., Cox, J., Dahlfors, M., David, S., Dillmann, I., Dolfini, R., Domingo-Pardo, C., Dridi, W., Duran, I., Eleftheriadis, C., Ferrant, L., Ferrari, A., Ferreira-Marques, R., Fitzpatrick, L., Frais-Koelbl, H., Fujii, K., Furman, W., Goncalves, I., Gonzalez-Romero, E., Goverdovski, A., Gramegna, F., Griesmayer, E., Gunsing, F., Haas, B., Haight, R., Heil, M., Herrera-Martinez, A., Igashira, M., Isaev, S., Jericha, E., Kappeler, F., Kadi, Y., Karadimos, D., Karamanis, D., Ketlerov, V., Kerveno, M., Koehler, P., Konovalov, V., Kossionides, E., Krticka, M., Lampoudis, C., Leeb, H., Lindote, A., Lopes, I., Lossito, R., Lozano, M., Lukic, S., Marganiec, J., Marques, L., Marrone, S., Martinez, T., Massimi, C., Mastinu, P., Mengoni, A., Milazzo, P. M., Moreau, C., Mosconi, M., Neves, F., Oberhummer, H., Brien, S. O, Oshima, M., Pancin, J., Papachristodoulou, C., Papadopoulos, C., Paradela, C., Patronis, N., Pavlik, A., Pavlopoulos, P., Perrot, L., Pigni, M. T., Plag, R., Plompen, A., Plukis, A., Poch, A., Praena, J., Pretel, C., Quesada, J., Rauscher, T., Reifarth, R., Rosetti, M., Rubbia, C., Rudolf, G., Rullhusen, P., Salgado, J., Santos, C., Sarchiapone, L., Savvidis, I., Stephan, C., Tagliente, G., Tain, J. L., Tassan-Got, L., Tavora, L., Terlizzi, R., Vannini, G., Vaz, P., Ventura, A., Villamarin, D., Vicente, M. C., Vlachoudis, V., Vlastou, R., Voss, F., Walter, S., Wendler, H., Wiescher, M., Wisshak, K., Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Pôle Universitaire Léonard de Vinci, Pôle Universitaire Léonard de Vinci (PULV), n_TOF Collaboration, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

Background: The design of new nuclear reactors and transmutation devices requires to reduce the present neutron cross section uncertainties of minor actinides. Purpose: Improvement of the 243Am(n,γ ) cross section uncertainty. Method: The 243Am(n,γ ) cross section has been measured at the n_TOF facility at CERN with a BaF2 total absorption calorimeter, in the energy range between 0.7 eV and 2.5 keV. Results: The 243Am(n,γ ) cross section has been successfully measured in the mentioned energy range. The resolved resonance region has been extended from 250 eV up to 400 eV. In the unresolved resonance region our results are compatible with one of the two incompatible capture data sets available below 2.5 keV. The data available in EXFOR and in the literature have been used to perform a simple analysis above 2.5 keV. Conclusions: The results of this measurement contribute to reduce the 243Am(n,γ ) cross section uncertainty and suggest that this cross section is underestimated up to 25% in the neutron energy range between 50 eV and a few keV in the present evaluated data libraries., JRC.D.4-Standards for Nuclear Safety, Security and Safeguards

Published
2014

3. Measurement of resolved resonances of Th-232 (n, gamma) at the n_TOF facility at CERN

Author

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

Subjects
Nuclear Physics - Experiment
Published
2012

4. Measurement of the U-236 (n, f) cross section from 170 meV to 2 MeV at the CERN n_TOF facility

Author

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

Subjects
Nuclear Physics - Experiment
Published
2011

5. $^{197}$Au($n,\gamma$) cross section in the unresolved resonance region

Author

Poch Parés, Agustí, Praena, J., Pretel Sánchez, Carme|||0000-0001-6199-3366, Igashira, M., Quesada, J., Pigni, M.T., Jericha, E., Plag, R., Isaev, S., Plompen, A., Karadimos, D., Cennini, P., Carrapiço, C., Carrillo de Albornoz, A., Cano-Ott, D., Capote, R., Calviani, M., Calviño Tavares, Francisco|||0000-0002-7198-4639, Belloni, F., Berthoumieux, E., Perrot, L., Martínez, T., Pavlopoulos, P., Pancin, J., Papachristodoulou, C., O'Brien, S., Oshima, M., Patronis, N., Pavlik, A., Papadopoulos, C., Paradela, C., Oberhummer, H., Lozano, M., Neves, F., Mosconi, M., Tassan-Got, L., Mastinu, P., Tarrío, D., Mendoza, E., Terlizzi, R., Milazzo, P.M., Tavora, L., Moreau, C., Losito, R., Vaz, P., Vannini, G., Márques, L., Villamarin, D., Marrone, S., Ventura, A., Tagliente, G., Marganiec, J., Lukic, S., Baumann, P., Barbagallo, M., Wisshak, K., Plukis, A., Badurek, G., Lindote, A., Wiescher, M., Audouin, L., Lopes, I., Wendler, H., Assimakopoulos, P.A., Lampoudis, C., Walter, S., Andrzejewski, J., Kadi, Y., Leeb, H., Andriamonje, S., Kossionides, E., Krticka, M., Álvarez-Velarde, F., Álvarez, H., Aerts, G., Becvár, F., Konovalov, V., Vlastou, R., Rauscher, T., Koehler, P., Voss, F., Ketlerov, V., Kerveno, M., Vlachoudis, V., Karamanis, D., Reifarth, R., Abbondanno, U., Griesmayer, E., Lederer, C., Guerrero, C., Colonna, N., Haas, B., Domingo-Pardo, C., Haight, R., Gunsing, F., Heil, M., Käppeler, F., Herrera-Martinez, A., Massimi, C., Mengoni, A., Wallner, A., Sarmento, R., Savvidis, I., Santos, C., Sarchiapone, L., Rullhusen, P., Gramegna, F., Salgado, J., Goverdovski, A., Rubbia, C., Gonzalez-Romero, E., Rudolf, G., Goncalves, I., Stephan, C., Rosetti, M., Ferreira-Marques, R., Fitzpatrick, L., Ferrant, L., Ferrari, A., Furman, W., Frais-Koelbl, H., Fujiii, K., Duran, I., Embid-Segura, M., Eleftheriadis, C., David, S., Dillmann, I., Dolfini, R., Dridi, W., Cortés Rossell, Guillem Pere|||0000-0002-3648-5826, Couture, A., Cox, J., Dahlfors, M., Chiaveri, E., Chepel, V., Taín Enríquez, José Luis|||0000-0002-3263-6965, 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], Energia nuclear, Nuclear energy, Nuclear Physics - Experiment
Abstract

The cross section of the reaction 197Au(n,γ ) was measured with the time-of-flight technique at the n TOF (neutron time-of-flight) facility in the unresolved resonance region between 5 and 400 keV using a pair of C6D6 (where D denotes 2H) liquid scintillators for the detection of prompt capture γ rays. The results with a total uncertainty of 3.9%–6.7% for a resolution of 20 bins per energy decade show fair agreement with the Evaluated Nuclear Data File Version B-VII.0 (ENDF/B-VII.0), which contains the standard evaluation. The Maxwellianaveraged cross section (MACS) at 30 keV is in excellent agreement with the one according to the ENDF/B-VII.0 evaluation and 4.7% higher than the MACS measured independently by activation technique. Structures in the cross section, which had also been reported earlier, have been interpreted as being due to clusters of resonances.

Published
2011

6. Neutron physics of the Re/Os clock. 1. Measurement of the (n, gamma) cross sections of Os-186, Os-187, Os-188 at the CERN n_TOF facility

Author

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

Subjects
Nuclear Physics - Experiment
Published
2010

7. Neutron physics of the Re/Os clock. 3. Resonance analyses and stellar (n, gamma) cross sections of Os-186, Os-187, Os-188

Author

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

Subjects
Nuclear Physics - Experiment
Published
2010

8. Measurement of the radiative neutron capture cross section of 206Pb and its astrophysical implications

Author

Domingo-Pardo, C., Abbondanno, U., Aerts, G., Alvarez, H., Alvarez-Velarde, F., Andriamonje, S., Andrzejewski, J., Assimakopoulos, P., Audouin, L., Badurek, G., Baumann, P., Becvar, F., Berthoumieux, E., Bisterzo, S., Calvino, F., Calviani, M., Cano-Ott, D., Capote, R., Carrapico, C., Cennini, P., Chepel, V., Chiaveri, E., Colonna, N., Cortes, G., Couture, A., Cox, J., Dahlfors, M., David, S., Dillman, I., Dolfini, R., Dridi, W., Duran, I., Eleftheriadis, C., Embid-Segura, M., Ferrant, L., Ferrari, A., Ferreira-Marques, R., Fitzpatrick, L., Frais-Koelbl, H., Fujii, K., Furman, W., Gallino, R., Goncalves, I., Gonzalez-Romero, E., Goverdovski, A., Gramegna, F., Griesmayer, E., Guerrero, C., Gunsing, F., Haas, B., Haight, R., Heil, M., Herrera-Martinez, A., Igashira, M., Isaev, M., Jericha, E., Kappeler, F., Kadi, Y., Karadimos, D., Karamanis, D., Kerveno, M., Ketlerov, V., Koehler, P., Konovalov, V., Kossionides, E., Krticka, M., Lamboudis, C., Leeb, H., Lindote, A., Lopes, I., Lozano, M., Lukic, S., Marganiec, J., Marrone, S., Massimi, C., Mastinu, P., Mengoni, A., Milazzo, P.M., Moreau, C., Mosconi, M., Neves, F., Oberhummer, H., Oshima, M., O'Brien, S., Pancin, J., Papachristodoulou, C., Papadopoulos, C., Paradela, C., Patronis, N., Pavlik, A., Pavlopoulos, P., Perrot, L., Plag, R., Plompen, A., Plukis, A., Poch, A., Pretel, C., Quesada, J., Rauscher, T., Reifarth, R., Rosetti, M., Rubbia, C., Rudolf, G., Rullhusen, P., Salgado, J., Sarchiapone, L., Savvidis, I., Stephan, C., Tagliente, G., Tain, J.L., Tassan-Got, L., Tavora, L., Terlizzi, R., Vannini, G., Vaz, P., Ventura, A., Villamarin, D., Vincente, M.C., Vlachoudis, V., Vlastou, R., Voss, F., Walter, S., Wendler, H., Wiescher, M., Wisshak, K., Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), nTOF, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
25.40.Lw,27.80.+w,97.10.Cv, Neutron capture cross sections, Pulse height weighting technique, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, C6D6 scintillation detectors, Nuclear Physics - Experiment, Nuclear astrophysics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, Monte Carlo simulations
Abstract

The (n, gamma) cross section of 206Pb has been measured at the CERN n_TOF facility with high resolution in the energy range from 1 eV to 600 keV by using two optimized C6D6 detectors. In the investigated energy interval about 130 resonances could be observed, from which 61 had enough statistics to be reliably analyzed via the R-matrix analysis code SAMMY. Experimental uncertainties were minimized, in particular with respect to (i) angular distribution effects of the prompt capture gamma-rays, and to (ii) the TOF-dependent background due to sample-scattered neutrons. Other background components were addressed by background measurements with an enriched 208Pb sample. The effect of the lower energy cutoff in the pulse height spectra of the C6D6 detectors was carefully corrected via Monte Carlo simulations. Compared to previous 206Pb values, the Maxwellian averaged capture cross sections derived from these data are about 20% and 9% lower at thermal energies of 5 keV and 30 keV, respectively. These new results have a direct impact on the s-process abundance of 206Pb, which represents an important test for the interpretation of the cosmic clock based on the decay of 238U., Comment: 11 pages, 8 figures, paper to be submitted to Phys. Rev. C

Published
2007

9. Measurement of the neutron capture cross section of the s-only isotope 204Pb from 1 eV to 440 keV

Author

DOMINGO-PARDO, C., ABBONDANNO, U., AERTS, G., ÁLVAREZ-POL, H., ALVAREZ-VELARDE, F., ANDRIAMONJE, S., ANDRZEJEWSKI, J., ASSIMAKOPOULOS, P., AUDOUIN, L., BADUREK, G., BAUMANN, P., BE&#269VÁ, F., BERTHOUMIEUX, E., BISTERZO, S., CALVIÑO, F., CANO-OTT, D., CAPOTE, R., CARRAPIÇO, C., CENNINI, P., CHEPEL, V., CHIAVERI, E., COLONNA, N., CORTES, G., COUTURE, A., COX, J., DAHLFORS, M., DAVID, S., DILLMANN, I., DOLFINI, R., DRIDI, W., DURAN, I., ELEFTHERIADIS, C., EMBID-SEGURA, M., FERRANT, L., FERRARI, Anthony, FERREIRA-MARQUES, R., FITZPATRICK, L., FRAIS-KOELBL, H., FUJII, K., FURMAN, W., GALLINO, R., GONCALVES, I., GONZALEZ-ROMERO, E., GOVERDOVSKI, A., GRAMEGNA, F., GRIESMAYER, E., GUERRERO, C., GUNSING, F., HAAS, B., HAIGHT, R., HEIL, M., HERRERA-MARTINEZ, A., IGASHIRA, M., ISAEV, S., JERICHA, E., KADI, Y., KÄPPELER, F., KARAMANIS, D., KARADIMOS, D., KERVENO, M., KETLEROV, V., KOEHLER, P., KONOVALOV, V., KOSSIONIDES, E., KRTIČKA, M., LAMBOUDIS, C., LEEB, H., LINDOTE, A., LOPES, I., LOZANO, M., LUKIC, S., MARGANIEC, J., MARRONE, S., MASTINU, P., MENGONI, A., M. MILAZZO, P., MOREAU, C., MOSCONI, M., NEVES, F., OBERHUMMER, H., OSHIMA, M., O'BRIEN, S., PANCIN, J., PAPACHRISTODOULOU, C., PAPADOPOULOS, C., PARADELA, C., PATRONIS, N., PAVLIK, A., PAVLOPOULOS, P., PERROT, L., PLAG, R., PLOMPEN, A., PLUKIS, A., POCH, A., PRETEL, C., QUESADA, J., RAUSCHER, T., REIFARTH, R., ROSETTI, M., RUBBIA, C., RUDOLF, G., RULLHUSEN, P., SALGADO, J., SARCHIAPONE, L., SAVVIDIS, I., STEPHAN, C., TAGLIENTE, G., L. TAIN, J., TASSAN-GOT, L., TAVORA, L., TERLIZZI, R., VANNINI, G., VAZ, P., VENTURA, A., VILLAMARIN, D., VINCENTE, M.C., VLACHOUDIS, V., VLASTOU, R., VOSS, F., WALTER, S., WENDLER, H., WIESCHER, M., WISSHAK, K., C. Domingo-Pardo, U. Abbondanno, G. Aert, H. Álvarez-Pol, F. Alvarez-Velarde, S. Andriamonje, J. Andrzejewski, P. Assimakopoulo, L. Audouin, G. Badurek, P. Baumann, F. Becvár, E. Berthoumieux, S. Bisterzo, F. Calviño, D. Cano-Ott, R. Capote, C. Carrapiço, P. Cennini, V. Chepel, E. Chiaveri, N. Colonna, G. Corte, A. Couture, J. Cox, M. Dahlfor, S. David, I. Dillman, R. Dolfini, W. Dridi, I. Duran, C. Eleftheriadi, M. Embid-Segura, L. Ferrant, A. Ferrari, R. Ferreira-Marque, L. Fitzpatrick, H. Frais-Koelbl, K. Fujii, W. Furman, R. Gallino, I. Goncalve, E. Gonzalez-Romero, A. Goverdovski, F. Gramegna, E. Griesmayer, C. Guerrero, F. Gunsing, B. Haa, R. Haight, M. Heil, A. Herrera-Martinez, M. Igashira, S. Isaev, E. Jericha, Y. Kadi, F. Käppeler, D. Karamani, D. Karadimo, M. Kerveno, V. Ketlerov, P. Koehler, V. Konovalov, E. Kossionide, M. Krtička, C. Lamboudi, H. Leeb, A. Lindote, I. Lope, M. Lozano, S. Lukic, J. Marganiec, S. Marrone, P. Mastinu, A. Mengoni, P. M. Milazzo, C. Moreau, M. Mosconi, F. Neve, H. Oberhummer, M. Oshima, S. O'Brien, J. Pancin, C. Papachristodoulou, C. Papadopoulo, C. Paradela, N. Patroni, A. Pavlik, P. Pavlopoulo, L. Perrot, R. Plag, A. Plompen, A. Pluki, A. Poch, C. Pretel, J. Quesada, T. Rauscher, R. Reifarth, M. Rosetti, C. Rubbia, G. Rudolf, P. Rullhusen, J. Salgado, L. Sarchiapone, I. Savvidi, C. Stephan, G. Tagliente, J. L. Tain, L. Tassan-Got, L. Tavora, R. Terlizzi, G. Vannini, P. Vaz, A. Ventura, D. Villamarin, M. C. Vincente, V. Vlachoudi, R. Vlastou, F. Vo, S. Walter, H. Wendler, M. Wiescher, K. Wisshak(n_TOF Collaboration), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), nTOF, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
25.40.Lw, 27.80.+w, 97.10.Cv, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], NEUTRON TIME OF FLIGHT, Nuclear Experiment, S-PROCESS, NEUTRON CAPTURE CROSS SECTION
Abstract

The neutron capture cross section of 204Pb has been measured at the CERN n_TOF installation with high resolution in the energy range from 1 eV to 440 keV. An R-matrix analysis of the resolved resonance region, between 1 eV and 100 keV, was carried out using the SAMMY code. In the interval between 100 keV and 440 keV we report the average capture cross section. The background in the entire neutron energy range could be reliably determined from the measurement of a 208Pb sample. Other systematic effects in this measurement could be investigated and precisely corrected by means of detailed Monte Carlo simulations. We obtain a Maxwellian average capture cross section for 204Pb at kT=30 keV of 79(3) mb, in agreement with previous experiments. However our cross section at kT=5 keV is about 35% larger than the values reported so far. The implications of the new cross section for the s-process abundance contributions in the Pb/Bi region are discussed., Comment: 8 pages, 3 figures, article submitted to Phys. Rev. C

Published
2007

10. New measurement of neutron capture resonances of 209Bi

Author

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

Subjects
Nuclear Physics - Experiment, Nuclear Experiment
Abstract

The neutron capture cross section of Bi209 has been measured at the CERN n TOF facility by employing the pulse-height-weighting technique. Improvements over previous measurements are mainly because of an optimized detection system, which led to a practically negligible neutron sensitivity. Additional experimental sources of systematic error, such as the electronic threshold in the detectors, summing of gamma-rays, internal electron conversion, and the isomeric state in bismuth, have been taken into account. Gamma-ray absorption effects inside the sample have been corrected by employing a nonpolynomial weighting function. Because Bi209 is the last stable isotope in the reaction path of the stellar s-process, the Maxwellian averaged capture cross section is important for the recycling of the reaction flow by alpha-decays. In the relevant stellar range of thermal energies between kT=5 and 8 keV our new capture rate is about 16% higher than the presently accepted value used for nucleosynthesis calculations. At this low temperature an important part of the heavy Pb-Bi isotopes are supposed to be synthesized by the s-process in the He shells of low mass, thermally pulsing asymptotic giant branch stars. With the improved set of cross sections we obtain an s-process fraction of 19(3)% of the solar bismuth abundance, resulting in an r-process residual of 81(3)%. The present (n,gamma) cross-section measurement is also of relevance for the design of accelerator driven systems based on a liquid metal Pb/Bi spallation target. The neutron capture cross section of Bi209 has been measured at the CERN n TOF facility by employing the pulse-height-weighting technique. Improvements over previous measurements are mainly because of an optimized detection system, which led to a practically negligible neutron sensitivity. Additional experimental sources of systematic error, such as the electronic threshold in the detectors, summing of gamma-rays, internal electron conversion, and the isomeric state in bismuth, have been taken into account. Gamma-ray absorption effects inside the sample have been corrected by employing a nonpolynomial weighting function. Because Bi209 is the last stable isotope in the reaction path of the stellar s-process, the Maxwellian averaged capture cross section is important for the recycling of the reaction flow by alpha-decays. In the relevant stellar range of thermal energies between kT=5 and 8 keV our new capture rate is about 16% higher than the presently accepted value used for nucleosynthesis calculations. At this low temperature an important part of the heavy Pb-Bi isotopes are supposed to be synthesized by the s-process in the He shells of low mass, thermally pulsing asymptotic giant branch stars. With the improved set of cross sections we obtain an s-process fraction of 19(3)% of the solar bismuth abundance, resulting in an r-process residual of 81(3)%. The present (n,gamma) cross-section measurement is also of relevance for the design of accelerator driven systems based on a liquid metal Pb/Bi spallation target.

Published
2006

11. Neutron capture cross section of 232Th measured at the n_TOF facility at CERN in the unresolved resonance region up to 1 MeV

Author

Aerts, G., Abbondanno, U., Álvarez, H., Alvarez-Velarde, F., Andriamonje, S., Andrzejewski, J., Assimakopoulos, P., Audouin, L., Badurek, G., Baumann, P., Be Vá, F., Berthoumieux, E., Calviño, F., Cano-Ott, D., Capote, R., Carrillo De Albornoz, A., Cennini, P., Chepel, V., Chiaveri, E., Colonna, N., Cortes, G., Couture, A., Cox, J., Dahlfors, M., David, S., Dillman, I., Dolfini, R., Domingo-Pardo, C., Dridi, W., Duran, I., Eleftheriadis, C., Embid-Segura, M., Ferrant, L., Ferrari, Anthony, Ferreira-Marques, R., Fitzpatrick, L., Frais-Koelbl, H., Fujii, K., Furman, W., Goncalves, I., Gonzalez-Romero, E., Goverdovski, A., Gramegna, F., Griesmayer, E., Guerrero, C., Gunsing, F., Haas, B., Haight, R., Heil, M., Herrera-Martinez, A., Igashira, M., Isaev, S., Jericha, E., Käppeler, F., Kadi, Y., Karadimos, D., Karamanis, D., Kerveno, M., Ketlerov, V., Koehler, P., Konovalov, V., Kossionides, E., Krti Ka, M., Lamboudis, C., Leeb, H., Lindote, A., Lopes, I., Lozano, M., Lukic, S., Marganiec, J., Marques, L., Marrone, S., Mastinu, P., Mengoni, A., Milazzo, P.M., Moreau, C., Mosconi, M., Neves, F., Oberhummer, H., O'Brien, S., Oshima, M., Pancin, J., Papachristodoulou, C., Papadopoulos, C., Paradela, C., Patronis, N., Pavlik, A., Pavlopoulos, P., Perrot, L., Pigni, M.T., Plag, R., Plompen, A., Plukis, A., Poch, A., Pretel, C., Quesada, J., Rauscher, T., Reifarth, R., Rosetti, M., Rubbia, C., Rudolf, G., Rullhusen, P., Salgado, J., Sarchiapone, L., Savvidis, I., Stephan, C., Taliente, G., Tain, J.L., Tassan-Got, L., Tavora, L., Terlizzi, R., Vannini, G., Vaz, P., Ventura, A., Villamarin, D., Vincente, M.C., Vlachoudis, V., Vlastou, R., Voss, F., Walter, S., Wendler, H., Wiescher, M., Wisshak, K., Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), nTOF, Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
25.40.Lw, 25.40.Ny, 28.20.Fc, Nuclear Physics - Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

We have measured the neutron capture reaction yield of 232Th$ at the neutron time-of-flight facility n_TOF at CERN in the energy range from 1 eV to 1 MeV. The average capture cross section has been extracted in the energy range from 4 keV up to 1 MeV with an overall accuracy better than 4%. An independent IAEA evaluation shows good agreement with the data. The average cross section has been expressed in terms of average resonance parameters using the partial waves \ell =0,1, and 2.

Published
2006

12. Measurement and resonance analysis of the 237Np neutron capture cross section

Author

M. Embid-Segura, Manuel Lozano, L. Perrot, R. Lossito, V. Chepel, Ralf Plag, Rene Reifarth, P. Baumann, I. Duran, P. Cennini, E. Kossionides, W.I. Furman, M. Mosconi, G. Aerts, A. Lindote, C. Stephan, C. A. Papachristodoulou, Javier Praena, P. Pavlopoulos, S. O'Brien, J. M. Quesada, A. Herrera-Martinez, N. Patronis, R. Terlizzi, F. Voss, F. Becvar, C. Eleftheriadis, M. C. Vicente, Alberto Mengoni, A. J. M. Plompen, P. M. Milazzo, A. Carrillo de Albornoz, G. Rudolf, L. Ferrant, M. Igashira, I. Lopes, Yacine Kadi, Nicola Colonna, D. Villamarin, P. E. Koehler, L. Fitzpatrick, J. Salgado, Marco T. Pigni, A. Poch, M. Oshima, J. L. Tain, J. Andrzejewski, Carlos Guerrero, Carlo Rubbia, Alfredo Ferrari, R. Ferreira-Marques, S. Isaev, Heinz Oberhummer, V. Vlachoudis, U. Abbondanno, L. Tavora, V. Konovalov, E. Griesmayer, J. Cox, Laurent Tassan-Got, S. David, G. Cortes, P. Rullhusen, G. Tagliente, C. Massimi, E. Jericha, R. C. Haight, Roberto Capote, V. Ketlerov, C. Carrapiço, P.A. Assimakopoulos, M. Kerveno, F. Neves, L. Audouin, F. Käppeler, G. Vannini, E. Gonzalez-Romero, Michael Wiescher, I. Goncalves, Thomas Rauscher, D. Karamanis, I. Dillmann, C. Moreau, D. Karadimos, Michael Heil, S. Walter, C. T. Papadopoulos, F. Gramegna, A. Plukis, A. Goverdovski, C. Santos, F. Alvarez-Velarde, Gerald Badurek, W. Dridi, R. Dolfini, M. Rosetti, S. Marrone, E. Mendoza, B. Haas, J. Marganiec, S. Andriamonje, R. Vlastou, P. F. Mastinu, E. Berthoumieux, I. Savvidis, M. Calviani, H. Frais-Koelbl, C. Paradela, S. Lukic, L. Marques, M. Krtička, C. Pretel, T. Martinez, K. Fujii, Fabio Belloni, F. Calviño, H. Leeb, L. Sarchiapone, M. Dahlfors, P. Vaz, Alberto Ventura, Aaron Couture, C. Lampoudis, A. Pavlik, C. Domingo-Pardo, F. Gunsing, J. Pancin, E. Chiaveri, D. Cano-Ott, K. Wisshak, H. Wendler, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Département Recherches Subatomiques (DRS-IPHC), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Aval du cycle et Energie Nucléaire (ACEN), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Pôle Universitaire Léonard de Vinci, Pôle Universitaire Léonard de Vinci (PULV), TOF, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, European Union (UE), Ministerio de Educación y Ciencia (MEC). España, Guerrero C., Cano-Ott D., Mendoza E., Abbondanno U., Aerts G., Alvarez-Velarde F., Andriamonje S., Andrzejewski J., Assimakopoulos P., Audouin L., Badurek G., Baumann P., Becvar F., Belloni F., Berthoumieux E., Calvino F., Calviani M., Capote R., Carrapico C., Carrillo de Albornoz A., Cennini P., Chepel V., Chiaveri E., Colonna N., Cortes G., Couture A., Cox J., Dahlfors M., David S., Dillmann I., Dolfini R., Domingo-Pardo C., Dridi W., Duran I., Eleftheriadis C., Embid-Segura M., Ferrant L., Ferrari A., Ferreira-Marques R., Fitzpatrick L., Frais-Koelbl H., Fujii K., Furman W., Goncalves I., Gonzalez-Romero E., Goverdovski A., Gramegna F., Griesmayer E., Gunsing F., Haas B., Haight R., Heil M., Herrera-Martinez A., Igashira M., Isaev S., Jericha E., Kaeppeler F., Kadi Y., Karadimos D., Karamanis D., Ketlerov V., Kerveno M., Koehler P., Konovalov V., Kossionides E., Krticka M., Lampoudis C., Leeb H., Lindote A., Lopes I., Lossito R., Lozano M., Lukic S., Marganiec J., Marques L., Marrone S., Martinez T., Massimi C., Mastinu P., Mengoni A., Milazzo P. M., Moreau C., Mosconi M., Neves F., Oberhummer H., O'Brien S., Oshima M., Pancin J., Papachristodoulou C., Papadopoulos C., Paradela C., Patronis N., Pavlik A., Pavlopoulos P., Perrot L., Pigni M. T., Plag R., Plompen A., Plukis A., Poch A., Praena J., Pretel C., Quesada J., Rauscher T., Reifarth R., Rosetti M., Rubbia C., Rudolf G., Rullhusen P., Salgado J., Santos C., Sarchiapone L., Savvidis I., Stephan C., Tagliente G., Tain J. L., Tassan-Got L., Tavora L., Terlizzi R., Vannini G., Vaz P., Ventura A., Villamarin D., Vicente M. C., Vlachoudis V., Vlastou R., Voss F., Walter S., Wendler H., Wiescher M., Wisshak K., Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Large Hadron Collider, 010308 nuclear & particles physics, CAPTURE CROSS-SECTION, Detector, Nuclear data, BARIUM-FLORIDE CALORIMETER, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Resonance (particle physics), Calorimeter, Nuclear physics, Cross section (physics), 0103 physical sciences, Range (statistics), Neutron cross section, Nuclear Physics - Experiment, GAMMA SPECTROSCOPY, 010306 general physics, EMERGING NUCLEAR TECHNOLOGIES
Abstract

The neutron capture cross section of 237Np was measured between 0.7 and 500 eV at the CERN n-TOF facility using the 4π BaF2 Total Absorption Calorimeter. The experimental capture yield was extracted minimizing all the systematic uncertainties and was analyzed together with the most reliable transmission data available using the sammy code. The result is a complete set of individual as well as average resonance parameters [D0=0.56(2) eV, Γγ=40.9(18) meV, 104S0=0.98(6), R ′=9.8(6) fm]. The capture cross section obtained in this work is in overall agreement with the evaluations and the data of Weston and Todd, thus showing sizable differences with respect to previous data from Scherbakov and large discrepancies with data Kobayashi. The results indicate that a new evaluation combining the present capture data with reliable transmission data would allow reaching an accuracy better than 4%, in line with the uncertainty requirements of the nuclear data community for the design and operation of current and future nuclear devices. Unión Europea NTOF-NDXADS IP-EUROTRANS CIEMAT-ENRESA Plan Nacional de Física de Partículas (España) FPA2005-06918-C03-01 Programa Consolider-Ingenio 2010 (España)

Published
2012

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