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1. A compact fission detector for fission-tagging neutron capture experiments with radioactive fissile isotopes

Author

Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, European Union (UE). H2020, Bacak, M., Aïche, M., Bélier, G., Berthoumieux, E., Diakaki, M., Dupont, E., Cortés Giraldo, Miguel Antonio, Guerrero Sánchez, Carlos, Lerendegui Marco, Jorge, Quesada Molina, José Manuel, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, European Union (UE). H2020, Bacak, M., Aïche, M., Bélier, G., Berthoumieux, E., Diakaki, M., Dupont, E., Cortés Giraldo, Miguel Antonio, Guerrero Sánchez, Carlos, Lerendegui Marco, Jorge, and Quesada Molina, José Manuel

Abstract

In the measurement of neutron capture cross-sections of fissile isotopes, the fission channel is a source of background which can be removed efficiently using the so-called fission-tagging or fission-veto technique. For this purpose a new compact and fast fission chamber has been developed. The design criteria and technical description of the chamber are given within the context of a measurement of the 233U(n, ) cross-section at the n_TOF facility at CERN, where it was coupled to the n_TOF Total Absorption Calorimeter. For this measurement the fission detector was optimized for time resolution, minimization of material in the neutron beam and for alpha-fission discrimination. The performance of the fission chamber and its application as a fission tagging detector are discussed.

Published
2020

2. Measurement of the 154Gd(n,gamma) cross section and its astrophysical implications

Author

Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Mazzoni, Alberto, Cristallo, Sergio, Aberle, O., Alcayne Aicua, Víctor, Amaducci, Simone, Andrzejewski, Józef, Audouin, Ludmila, Calviño Tavares, Francisco, Casanovas Hoste, Adrià, Cortés Rossell, Guillem Pere, Tarifeño Saldivia, Ariel Esteban, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Mazzoni, Alberto, Cristallo, Sergio, Aberle, O., Alcayne Aicua, Víctor, Amaducci, Simone, Andrzejewski, Józef, Audouin, Ludmila, Calviño Tavares, Francisco, Casanovas Hoste, Adrià, Cortés Rossell, Guillem Pere, and Tarifeño Saldivia, Ariel Esteban

Abstract

The neutron capture cross section of 154Gd was measured from 1 eV to 300 keV in the experimental area located 185 m from the CERN n_TOF neutron spallation source, using a metallic sample of gadolinium, enriched to 67% in 154Gd. The capture measurement, performed with four C6D6 scintillation detectors, has been complemented by a transmission measurement performed at the GELINA time-of-flight facility (JRC-Geel), thus minimising the uncertainty related to sample composition. An accurate Maxwellian averaged capture cross section (MACS) was deduced over the temperature range of interest for s process nucleosynthesis modelling. We report a value of 880(50) mb for the MACS at keV, significantly lower compared to values available in literature. The new adopted 154Gd(n,¿) cross section reduces the discrepancy between observed and calculated solar s-only isotopic abundances predicted by s-process nucleosynthesis models., Postprint (published version)

Published
2020

3. A compact fission detector for fission-tagging neutron capture experiments with radioactive fissile isotopes

Author

D. Macina, A. Musumarra, K. Göbel, M. Sabaté-Gilarte, E. Mendoza, A. Oprea, I. Knapova, N. V. Sosnin, T. Wright, J. Heyse, Rene Reifarth, N. Kivel, R. Nolte, L. Cosentino, J. Marganiec, P. F. Mastinu, P. Vaz, F. Bečvář, Annamaria Mazzone, Petar Žugec, M. Aiche, I. Duran, Stefan Kopecky, A. Saxena, A. Kimura, Alberto Ventura, G. Vannini, S. Valenta, Nicola Colonna, M. Kokkoris, M. A. Cortés-Giraldo, P. M. Milazzo, R. Dressler, P. Kavrigin, E. Dupont, Carlos Guerrero, G. Sibbens, M. Mastromarco, Marco Calviani, B. Laurent, E. González-Romero, P. Ferreira, Mario Barbagallo, L. Audouin, M. Krtička, A. Pavlik, A. G. Smith, J. Billowes, D. Schumann, E. Griesmayer, Anton Wallner, Alexandru Negret, G. Cortes, C. Domingo-Pardo, G. Tagliente, M. Bacak, L. A. Damone, F. Käppeler, J. Balibrea, Philip Woods, O. Aberle, D. Vanleeuw, F. Mingrone, J. Andrzejewski, F. Calviño, H. Leeb, E. A. Maugeri, A. Kalamara, T. Martinez, C. Weiss, R. Vlastou, Olivier Serot, Carlo Rubbia, V. Vlachoudis, J. Perkowski, M. Diakaki, D. Radeck, Alfredo Ferrari, E. Berthoumieux, Stephan Richter, P. Schillebeeckx, S. Warren, F. Gunsing, A. Masi, Damir Bosnar, Y. Kadi, A. Manna, Hideo Harada, Deniz Kurtulgil, V. Variale, D. G. Jenkins, Y. H. Chen, Cristian Massimi, P. V. Sedyshev, G. Belier, S. Heinitz, V. Furman, A. Stamatopoulos, E. Chiaveri, D. Cano-Ott, A. S. Brown, A. Casanovas, C. Lederer, E. Jericha, T. Glodariu, Paolo Finocchiaro, J. M. Quesada, L. Tassan-Got, A. Moens, J. A. Ryan, S. Amaducci, Simone Gilardoni, R. Cardella, Javier Praena, S. Lo Meo, M. Caamaño, F. Cerutti, B. Fernández-Domínguez, J. L. Tain, J. Taieb, L. Mathieu, E. Leal-Cidoncha, A. Gawlik, Thomas Rauscher, A. R. García, Ariel Tarifeño-Saldivia, S. J. Lonsdale, Ignacio Porras, J. Lerendegui-Marco, I. F. Gonçalves, N. Patronis, Alberto Mengoni, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), 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), Bacak, M., Aiche, M., Belier, G., Berthoumieux, E., Diakaki, M., Dupont, E., Gunsing, F., Heyse, J., Kopecky, S., Laurent, B., Leeb, H., Mathieu, L., Moens, A., Richter, S., Schillebeeckx, P., Serot, O., Sibbens, G., Taieb, J., Vanleeuw, D., Vlachoudis, V., Aberle, O., Amaducci, S., Andrzejewski, J., Audouin, L., Balibrea, J., Barbagallo, M., Becvar, F., Billowes, J., Bosnar, D., Brown, A., Caamano, M., Calvino, F., Calviani, M., Cano-Ott, D., Cardella, R., Casanovas, A., Cerutti, F., Chen, Y. H., Chiaveri, E., Colonna, N., Cortes, G., Cortes-Giraldo, M. A., Cosentino, L., Damone, L. A., Domingo-Pardo, C., Dressler, R., Duran, I., Fernandez-Dominguez, B., Ferrari, A., Ferreira, P., Finocchiaro, P., Furman, V., Gobel, K., Garcia, A. R., Gawlik, A., Gilardoni, S., Glodariu, T., Goncalves, I. F., Gonzalez-Romero, E., Griesmayer, E., Guerrero, C., Harada, H., Heinitz, S., Jenkins, D. G., Jericha, E., Kappeler, F., Kadi, Y., Kalamara, A., Kavrigin, P., Kimura, A., Kivel, N., Knapova, I., Kokkoris, M., Krticka, M., Kurtulgil, D., Leal-Cidoncha, E., Lederer, C., Lerendegui-Marco, J., Lo Meo, S., Lonsdale, S. J., Macina, D., Manna, A., Marganiec, J., Martinez, T., Masi, A., Massimi, C., Mastinu, P., Mastromarco, M., Maugeri, E. A., Mazzone, A., Mendoza, E., Mengoni, A., Milazzo, P. M., Mingrone, F., Musumarra, A., Negret, A., Nolte, R., Oprea, A., Patronis, N., Pavlik, A., Perkowski, J., Porras, I., Praena, J., Quesada, J. M., Radeck, D., Rauscher, T., Reifarth, R., Rubbia, C., Ryan, J. A., Sabate-Gilarte, M., Saxena, A., Schumann, D., Sedyshev, P., Smith, A. G., Sosnin, N. V., Stamatopoulos, A., Tagliente, G., Tain, J. L., Tarifeno-Saldivia, A., Tassan-Got, L., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vlastou, R., Wallner, A., Warren, S., Weiss, C., Woods, P. J., Wright, T., Zugec, P., 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 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), Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Bacak M., Aiche M., Belier G., Berthoumieux E., Diakaki M., Dupont E., Gunsing F., Heyse J., Kopecky S., Laurent B., Leeb H., Mathieu L., Moens A., Richter S., Schillebeeckx P., Serot O., Sibbens G., Taieb J., Vanleeuw D., Vlachoudis V., Aberle O., Amaducci S., Andrzejewski J., Audouin L., Balibrea J., Barbagallo M., Becvar F., Billowes J., Bosnar D., Brown A., Caamano M., Calvino F., Calviani M., Cano-Ott D., Cardella R., Casanovas A., Cerutti F., Chen Y.H., Chiaveri E., Colonna N., Cortes G., Cortes-Giraldo M.A., Cosentino L., Damone L.A., Domingo-Pardo C., Dressler R., Duran I., Fernandez-Dominguez B., Ferrari A., Ferreira P., Finocchiaro P., Furman V., Gobel K., Garcia A.R., Gawlik A., Gilardoni S., Glodariu T., Goncalves I.F., Gonzalez-Romero E., Griesmayer E., Guerrero C., Harada H., Heinitz S., Jenkins D.G., Jericha E., Kappeler F., Kadi Y., Kalamara A., Kavrigin P., Kimura A., Kivel N., Knapova I., Kokkoris M., Krticka M., Kurtulgil D., Leal-Cidoncha E., Lederer C., Lerendegui-Marco J., Lo Meo S., Lonsdale S.J., Macina D., Manna A., Marganiec J., Martinez T., Masi A., Massimi C., Mastinu P., Mastromarco M., Maugeri E.A., Mazzone A., Mendoza E., Mengoni A., Milazzo P.M., Mingrone F., Musumarra A., Negret A., Nolte R., Oprea A., Patronis N., Pavlik A., Perkowski J., Porras I., Praena J., Quesada J.M., Radeck D., Rauscher T., Reifarth R., Rubbia C., Ryan J.A., Sabate-Gilarte M., Saxena A., Schumann D., Sedyshev P., Smith A.G., Sosnin N.V., Stamatopoulos A., Tagliente G., Tain J.L., Tarifeno-Saldivia A., Tassan-Got L., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Vlastou R., Wallner A., Warren S., Weiss C., Woods P.J., Wright T., and Zugec P.

Subjects
Nuclear and High Energy Physics, Fission, Physics::Instrumentation and Detectors, Nuclear Theory, Física::Física de partícules [Àrees temàtiques de la UPC], Nuclear physics, Context (language use), Neutrons--Captura, 01 natural sciences, 7. Clean energy, Neutrons--Capture, 0103 physical sciences, Physics::Atomic and Molecular Clusters, 233 U, ddc:530, n_TOF, 010306 general physics, Nuclear Experiment, Instrumentation, Energies::Energia nuclear [Àrees temàtiques de la UPC], Physics, [PHYS]Physics [physics], Fission detector, 233U, Time-of-flight, Física [Àrees temàtiques de la UPC], Fissile material, 010308 nuclear & particles physics, Detector, Neutron radiation, Fast fission, NATURAL SCIENCES. Physics, Calorimeter, PRIRODNE ZNANOSTI. Fizika, Neutron capture, 13. Climate action, Física nuclear, Other
Abstract

In the measurement of neutron capture cross-sections of fissile isotopes, the fission channel is a source of background which can be removed efficiently using the so-called fission-tagging or fission-veto technique. For this purpose a new compact and fast fission chamber has been developed. The design criteria and technical description of the chamber are given within the context of a measurement of the 233U(n, ������) cross-section at the n_TOF facility at CERN, where it was coupled to the n_TOF Total Absorption Calorimeter. For this measurement the fission detector was optimized for time resolution, minimization of material in the neutron beam and for alpha-fission discrimination. The performance of the fission chamber and its application as a fission tagging detector are discussed., This work was partially supported by the French NEEDS/NACRE Project and by the European Commission within HORIZON2020 via the EURATOM Project EUFRAT.

Published
2020
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4. A compact fission detector for fission-tagging neutron capture experiments with radioactive fissile isotopes

Author

Bacak, M., Aïche, M., Bélier, G., Berthoumieux, E., Diakaki, M., Dupont, E., Cortés Giraldo, Miguel Antonio, Guerrero Sánchez, Carlos, Lerendegui Marco, Jorge, Quesada Molina, José Manuel, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, and European Union (UE). H2020

Subjects
233U, Time-of-flight, Fission detector, n_TOF
Abstract

In the measurement of neutron capture cross-sections of fissile isotopes, the fission channel is a source of background which can be removed efficiently using the so-called fission-tagging or fission-veto technique. For this purpose a new compact and fast fission chamber has been developed. The design criteria and technical description of the chamber are given within the context of a measurement of the 233U(n, ) cross-section at the n_TOF facility at CERN, where it was coupled to the n_TOF Total Absorption Calorimeter. For this measurement the fission detector was optimized for time resolution, minimization of material in the neutron beam and for alpha-fission discrimination. The performance of the fission chamber and its application as a fission tagging detector are discussed. French NEEDS/NACRE Project European Commission within HORIZON2020 via the EURATOM Project EUFRAT

Published
2020

5. Measurement of 73Ge(n,γ) cross sections and implications for stellar nucleosynthesis

Author

Universidad de Sevilla. Departamento de Ingeniería Electrónica, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Universidad de Sevilla. TIC192: Ingeniería Electrónica, Lederer-Woods, Claudia, Battino, Umberto, Ferreira, Paulo N., Guerrero, Carlos, Lerendegui Marco, Jorge, Cortés Giraldo, Miguel Antonio, Palomo Pinto, Rogelio, Quesada Molina, José Manuel, Sabaté Gilarte, Marta, Universidad de Sevilla. Departamento de Ingeniería Electrónica, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Universidad de Sevilla. TIC192: Ingeniería Electrónica, Lederer-Woods, Claudia, Battino, Umberto, Ferreira, Paulo N., Guerrero, Carlos, Lerendegui Marco, Jorge, Cortés Giraldo, Miguel Antonio, Palomo Pinto, Rogelio, Quesada Molina, José Manuel, and Sabaté Gilarte, Marta

Abstract

73Ge(n,γ) cross sections were measured at the neutron time-of-flight facility n_TOF at CERN up to neutron energies of 300 keV, providing for the first time experimental data above 8 keV. Results indicate that the stellar cross section at kT=30 keV is 1.5 to 1.7 times higher than most theoretical predictions. The new cross sections result in a substantial decrease of 73Ge produced in stars, which would explain the low isotopic abundance of 73Ge in the solar system.

Published
2019

6. On the use of stacks of fission-like targets for neutron capture experiments

Author

Ministerio de Economía y Competitividad (España), European Commission, Universidad de Sevilla, Guerrero, C., Lerendegui-Marco, J., Eberhardt, K., Düllmann, C.E., Junghans, A. R., Lommel, B., Mokry, C., Quesada, José Manuel, Runke, J., Thörle-Pospiech, P., n_TOF Collaboration, Ministerio de Economía y Competitividad (España), European Commission, Universidad de Sevilla, Guerrero, C., Lerendegui-Marco, J., Eberhardt, K., Düllmann, C.E., Junghans, A. R., Lommel, B., Mokry, C., Quesada, José Manuel, Runke, J., Thörle-Pospiech, P., and n_TOF Collaboration

Abstract

The measurement of neutron induced reactions on unstable isotopes is of interest in many fields, from nuclear energy to astrophysics or applications; in particular transuranic isotopes are essential for the development of innovative nuclear reactors and for the management of the radioactive waste. In such measurements, the quality of the associated radioactive target is crucial for the success of the experiment, but in many cases the geometry, amount of mass and encapsulation of the target are not optimal, leading to limited results. In this work we propose to produce high quality radioactive targets for capture as a stack of thin targets using the techniques usually employed for fission measurements. In particular, we have succeeded in making a 242Pu target of nearly 100 mg by combining seven thin (1 mg/cm2) fission-like targets with 45 mm in diameter achieving a total backing thickness of only of aluminum. The target has been shown to perform successfully in experiments at both a neutron time-of-flight facility (n_TOF at CERN) and a thermal neutron beam (BRR at KFKI), providing the most accurate data from thermal up to 500 keV to date.

Published
2019

7. Measurement of 73Ge(n,γ) cross sections and implications for stellar nucleosynthesis

Author

Lederer-Woods, Claudia, Battino, Umberto, Ferreira, Paulo N., Guerrero, Carlos, Lerendegui Marco, Jorge, Cortés Giraldo, Miguel Antonio, Palomo Pinto, Rogelio, Quesada Molina, José Manuel, Sabaté Gilarte, Marta, Universidad de Sevilla. Departamento de Ingeniería Electrónica, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, and Universidad de Sevilla. TIC192: Ingeniería Electrónica

Subjects
Neutron capture, Germanium, n_TOF, Nucleosynthesis, s process
Abstract

73Ge(n,γ) cross sections were measured at the neutron time-of-flight facility n_TOF at CERN up to neutron energies of 300 keV, providing for the first time experimental data above 8 keV. Results indicate that the stellar cross section at kT=30 keV is 1.5 to 1.7 times higher than most theoretical predictions. The new cross sections result in a substantial decrease of 73Ge produced in stars, which would explain the low isotopic abundance of 73Ge in the solar system. Fondo de Ciencia de Austria J3503 Consejo de Instalaciones de Ciencia y Tecnología Reino Unido ST / M006085 / 1 Consejo Europeo de Investigación ERC-2015-StG Nr.677497.

Published
2019

8. A new CVD Diamond Mosaic-Detector for (n, α ) Cross-Section Measurements at the n TOF Experiment at CERN

Author

Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Cortés Giraldo, Miguel Antonio, Weiss, Christina, Griesmayer, E., Guerrero Sánchez, Carlos, Barbagallo, M., Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Cortés Giraldo, Miguel Antonio, Weiss, Christina, Griesmayer, E., Guerrero Sánchez, Carlos, and Barbagallo, M.

Abstract

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

Published
2013

9. Status and outlook of the neutron time-of-flight facility n_TOF at CERN

Author

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

Abstract

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

Published
2007

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