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201. The measurement of the 206Pbn, gamma cross section and stellar implications

Author: L. Tavora, L. Perrot, I. Savvidis, E. Gonzalez-Romero, P. Rullhusen, A. Plukis, F. Käppeler, R. Ferreira-Marques, L. Ferrant, R. C. Haight, D. Karamanis, I. Dillmann, P. Pavlopoulos, C. Paradela, I. Duran, M. C. Vincente, V. Chepel, Rene Reifarth, J. M. Quesada, L. Tassan-Got, L. Audouin, P. Baumann, B. Haas, Michael Wiescher, J. Andrzejewski, G. Aerts, C. Carrapiço, A. J. M. Plompen, U. Abbondanno, P. E. Koehler, Carlo Rubbia, W. Dridi, W.I. Furman, M. Dahlfors, G. Rudolf, I. Lopes, D. Villamarin, Marco T. Pigni, James L. Cox, F. Bečvář, E. Berthoumieux, P. Vaz, C. A. Papachristodoulou, F. Neves, P. M. Milazzo, Alberto Ventura, Aaron Couture, E. Jericha, S. Walter, S. Lukic, F. Gramegna, Ralf Plag, J. Salgado, A. Poch, J. Marganiec, S. Andriamonje, P. F. Mastinu, L. Sarchiapone, H. Leeb, Masayuki Igashira, J. Pancin, P. Cennini, Carlos Guerrero, F. Gunsing, M. Embid-Segura, G. Cortes, M. Mosconi, R. Vlastou, Heinz Oberhummer, C. Stephan, S. O'Brien, F. Voss, Manuel Lozano, Y. Kadi, Cristian Massimi, R. Terlizzi, M. Krtička, F. Calviño, Marco Calviani, Nicola Colonna, Vasilis Vlachoudis, S. David, G. Tagliente, K. Wisshak, A. Pavlik, Roberto Capote, P.A. Assimakopoulos, C. Domingo-Pardo, G. Vannini, F. Alvarez-Velarde, D. Cano-Ott, Gerald Badurek, A. Lindote, C. T. Papadopoulos, S. Marrone, H. Álvarez, R. Gallino, C. Lamboudis, J. L. Tain, Michael Heil, M. Kerveno, E. Kossionides, C. Eleftheriadis, I. Goncalves, Thomas Rauscher, C. Santos, D. Karadimos, K. Fujii, C. Pretel, Sara Bisterzo, A. Herrera-Martinez, N. Patronis, Arnaud Ferrari, Alberto Mengoni, 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, C Domingo-Pardo, U Abbondanno, G Aert, H Álvarez, F Alvarez-Velarde, S Andriamonje, J Andrzejewski, P Assimakopoulo, L Audouin, G Badurek, P Baumann, F Bečvář, E Berthoumieux, S Bisterzo, F Calviño, M Calviani, D Cano-Ott, R Capote, C Carrapiço, P Cennini, V Chepel, N Colonna, G Corte, A Couture, J Cox, M Dahlfor, S David, I Dillmann, W Dridi, I Duran, C Eleftheriadi, M Embid-Segura, L Ferrant, A Ferrari, R Ferreira-Marque, K Fujii, W Furman, R Gallino, I Goncalve, E Gonzalez-Romero, F Gramegna, C Guerrero, F Gunsing, B Haa, R Haight, M Heil, A Herrera-Martinez, M Igashira, E Jericha, Y Kadi, F Käppeler, D Karadimo, D Karamani, M Kerveno, P Koehler, E Kossionide, M Krtička, C Lamboudi, H Leeb, A Lindote, I Lope, M Lozano, S Lukic, J Marganiec, S Marrone, C Massimi, P Mastinu, A Mengoni, P M Milazzo, M Mosconi, F Neve, H Oberhummer, S O'Brien, J Pancin, C Papachristodoulou, C Papadopoulo, C Paradela, N Patroni, A Pavlik, P Pavlopoulo, L Perrot, M T Pigni, R Plag, A Plompen, A Pluki, A Poch, C Pretel, J Quesada, T Rauscher, R Reifarth, C Rubbia, G Rudolf, P Rullhusen, J Salgado, C Santo, 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, M Wiescher, K Wisshak, 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, s proce, Nuclear and High Energy Physics, Spectrometer, experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, Cross section (physics), Neutron capture, Stellar nucleosynthesis, 13. Climate action, Nucleosynthesis, 0103 physical sciences, Neutron cross section, r-process, CERN n_TOF spectrometer, Alpha decay, 010306 general physics, 010303 astronomy & astrophysics
Abstract: The neutron capture cross section of (206)Pb has been measured at the CERN n_TOF spectrometer using a setup of two C(6)D(6) detectors. In the energy interval from 1 eV to 600 keV the cross section is dominated by resonances, which were analyzed via the R-matrix analysis code SAMMY. In the relevant energy ranges for stellar nucleosynthesis, i. e., at thermal energies of kT = 8 keV and kT = 23 keV, the present Maxwellian average cross section differs by 20% and 9% from the recommended values of Bao et al respectively. From the new cross section the s-abundance of (206)Pb could be reliably determined as 70( 4)%. This result is of importance in order to test and constrain r-process abundance calculations in the actinide region, because the r-process portion of (206)Pb is dominated by alpha-back decays of short-lived transbismuth isotopes.
Published: 2008
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202. NEUTRON CROSS SECTIONS FOR NUCLEOSYNTHESIS STUDIES

Author: Z.Y. Bao, H. Beer, Thomas Rauscher, F. Voss, K. Wisshak, and F. Käppeler
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Neutron capture, Stellar nucleosynthesis, Nucleosynthesis, Nuclear structure, Neutron, p-Nuclei, s-process, Atomic and Molecular Physics, and Optics, p-process
Abstract: Previous compilations of (n,γ) cross sections of relevance for neutron capture nucleosynthesis in the big bang and in the slow neutron capture process (s process) have been updated to encompass information available up to December 1998; data references include work in process then and published subsequently. The experimental results for nuclei between H and Bi were critically surveyed, renormalized to selected standard cross sections, and condensed into a set of recommended Maxwellian averaged cross sections for a thermal energy of kT=30 keV. Recent statistical model calculations of the capture cross sections made with the code NON-SMOKER are listed for comparison; these calculated cross sections are adopted in those cases where experimental information is still missing, e.g., for the majority of radioactive nuclei defining the s-process branchings. Maxwellian averages, normalized to our recommended 30 keV averages, were determined for a range of thermal energies between kT=5 and 100 keV. We have also included the calculated stellar enhancement factors due to thermally populated nuclear states as a function of temperature.
Published: 2000
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203. The Stellar Neutron‐Capture Rate of \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} \landscape $^{34}$ \end{document} S: The Origin of \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} \landscape $^{36}$ \end{document} S Challenged

Author: R. Reifarth, K. Schwarz, and F. Käppeler
Subjects: Physics, Nuclear reaction, Neutron monitor, Astronomy and Astrophysics, Astrophysics, Nuclear physics, Neutron capture, Cross section (physics), Stars, medicine.anatomical_structure, Space and Planetary Science, Nucleosynthesis, medicine, Neutron, Nucleus
Abstract: The (n, γ) cross section of 34S has been measured by means of the activation technique using a quasi-stellar neutron spectrum corresponding to a thermal energy of kT = 25 keV. In spite of the very small cross section of this neutron-magic nucleus and a number of additional experimental complications, the stellar value of σv/vT = 226 ± 10 μb could be reliably determined. Because of this small cross section, 34S acts as a bottleneck for the reaction flow to 36S. Consequently, the suggested interpretation of the 36S abundance as a neutron monitor for the s-process in massive stars must be ruled out. This implies, however, that the origin of 36S remains an open problem.
Published: 2000
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204. Measurement of the radiative neutron capture cross section of 206-Pb and its astrophysical implication

Author: C. Domingo Pardo, U. Abbondanno, G. Aerts, H. Álvarez, F. Alvarez Velarde, S. Andriamonje, J. Andrzejewski, P. Assimakopoulos, 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. Cortes, A. Couture, J. Cox, M. Dahlfors, S. David, I. Dillman, R. Dolfini, W. Dridi, I. Duran, C. Eleftheriadis, M. Embid Segura, L. Ferrant, A. Ferrari, R. Ferreira Marques, L. Fitzpatrick, H. Frais Koelbl, K. Fujii, W. Furman, R. Gallino, I. Goncalves, E. Gonzalez Romero, A. Goverdovski, F. Gramegna, E. Griesmayer, C. Guerrero, F. Gunsing, B. Haas, R. Haight, M. Heil, A. Herrera Martinez, M. Igashira, S. Isaev, E. Jericha, Y. Kadi, F. Käppeler, D. Karamanis, D. Karadimos, M. Kerveno, V. Ketlerov, P. Koehler, V. Konovalov, E. Kossionides, M. Krtička, C. Lamboudis, H. Leeb, A. Lindote, I. Lopes, M. Lozano, S. Lukic, J. Marganiec, S. Marrone, P. Mastinu, A. Mengoni, P. M. Milazzo, C. Moreau, M. Mosconi, F. Neves, H. Oberhummer, M. Oshima, S. O'Brien, J. Pancin, C. Papachristodoulou, C. Papadopoulos, C. Paradela, N. Patronis, A. Pavlik, P. Pavlopoulos, L. Perrot, R. Plag, A. Plompen, A. Plukis, A. Poch, C. Pretel, J. Quesada, T. Rauscher, R. Reifarth, M. Rosetti, C. Rubbia, G. Rudolf, P. Rullhusen, J. Salgado, L. Sarchiapone, I. Savvidis, C. Stephan, G. Tagliente, J. L. Tain, L. Tassan Got, L. Tavora, R. Terlizzi, P. Vaz, A. Ventura, D. Villamarin, M. C. Vincente, V. Vlachoudis, R. Vlastou, F. Voss, S. Walter, H. Wendler, M. Wiescher, K. Wisshak, MASSIMI, CRISTIAN, VANNINI, GIANNI, C. Domingo-Pardo, U. Abbondanno, G. Aert, H. Álvarez, 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, C. Massimi, 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, and K. Wisshak(n_TOF Collaboration)
Subjects: NUCLEAR ASTROPHYSICS, NEUTRON CAPTURE REACTION, NUCLEAR PHYSICS
Published: 2007

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

Author: F. Käppeler, C. Lampoudis, L. Marques, A. J. M. Plompen, H. Frais-Koelbl, A. Pavlik, I. Goncalves, F. Voss, E. Kossionides, I. Duran, P. Cennini, P.A. Assimakopoulos, S. Walter, C. T. Papadopoulos, A. Herrera-Martinez, Marco T. Pigni, N. Patronis, W. Furman, R. Vlastou, Thomas Rauscher, G. Vannini, E. Berthoumieux, P.M. Milazzo, P. Baumann, Nicola Colonna, S. Lukic, K. Fujii, M. Oshima, M. Dahlfors, D. Cano-Ott, F. Gunsing, P. Vaz, Carlo Rubbia, D. Karadimos, R. Ferreira-Marques, I. Dillman, Alberto Ventura, V. Ketlerov, I. Savvidis, V. Chepel, T. Martínez, V. Vlachoudis, R. Haight, D. Villamarin, G. Tagliente, C. Stephan, C. Pretel, P. E. Koehler, Cristian Massimi, J. Pancin, L. Sarchiapone, L. Perrot, I. Lopes, J. Cox, S. Marrone, C. A. Papachristodoulou, P. Mastinu, Manuel Lozano, E. Chiaveri, F. Neves, G. Cortes, H. Wendler, L. Ferrant, V.Y. Konovalov, H. Álvarez, M. Rosetti, J. Andrzejewski, G. Rudolf, K. Wisshak, Carlos Guerrero, F. Bečvář, E. González-Romero, R. Reifarth, R. Terlizzi, J. M. Quesada, A. Couture, M.C. Vincente, Heinz Oberhummer, E. Griesmayer, J. Marganiec, R. Capote, L. Tassan-Got, L. Tavora, M. Mosconi, P. Rullhusen, S. David, A. Lindote, L. Audouin, A. Poch, B. Haas, P. Pavlopoulos, C. Eleftheriadis, M. Kerveno, Yacine Kadi, U. Abbondanno, W. Dridi, Alberto Mengoni, R. Plag, Alfredo Ferrari, H. Leeb, S. G. Isaev, A. Carrillo de Albornoz, C. Paradela, A. Plukis, M. Krtička, F. Calviño, E. Jericha, S. Andriamonje, J.L. Tain, M. Heil, F. Gramegna, M. Igashira, M. Wiescher, C. Domingo-Pardo, G. Aerts, S. O'Brien, A. Goverdovski, C. Moreau, F. Alvarez-Velarde, Gerald Badurek, R. Dolfini, D. Karamanis, J. Salgado, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, F. Gunsing, U. Abbondanno, G. Aert, H. Álvarez, F. Álvarez-Velarde, S. Andriamonje, J. Andrzejewski, P. Assimakopoulo, L. Audouin, G. Badurek, P. Baumann, F. Bečvář, E. Berthoumieux, F. Calviño, D. Cano-Ott, R. Capote, A. Carrillo de Albornoz, P. Cennini, V. Chepel, E. Chiaveri, N. Colonna, G. Corte, A. Couture, J. Cox, M. Dahlfor, S. David, I. Dillman, R. Dolfini, C. Domingo-Pardo, W. Dridi, I. Duran, C. Eleftheriadi, L. Ferrant, A. Ferrari, R. Ferreira-Marque, H. Frais-Koelbl, K. Fujii, W. Furman, I. Goncalve, E. González-Romero, A. Goverdovski, F. Gramegna, E. Griesmayer, C. Guerrero, B. Haa, R. Haight, M. Heil, A. Herrera-Martinez, M. Igashira, S. Isaev, E. Jericha, F. Käppeler, Y. Kadi, D. Karadimo, D. Karamani, M. Kerveno, V. Ketlerov, P. Koehler, V. Konovalov, E. Kossionide, M. Krtička, C. Lampoudi, H. Leeb, A. Lindote, I. Lope, M. Lozano, S. Lukic, J. Marganiec, L. Marque, S. Marrone, T. Martínez, C. Massimi, P. Mastinu, A. Mengoni, P.M. Milazzo, C. Moreau, M. Mosconi, F. Neve, H. Oberhummer, S. O’Brien, M. Oshima, J. Pancin, C. Papachristodoulou, C. Papadopoulo, C. Paradela, N. Patroni, A. Pavlik, P. Pavlopoulo, L. Perrot, M.T. Pigni, 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, 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), 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), 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), 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), Pole Universitaire Leonard de Vinci, Pôle Universitaire Léonard de Vinci (PULV), nTOF, 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: Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, SPALLATION, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Nuclear physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, NEUTRONS, Neutron time-of-flight scattering, 29.25, 28.20.−v, 24.30.−v, 98.80, Neutron flux, 0103 physical sciences, CERN, Neutron cross section, Neutron detection, Neutron, n_TOF, 010306 general physics, Nuclear Experiment, Instrumentation, Physics, Neutrons, Energies::Energia nuclear [Àrees temàtiques de la UPC], Física [Àrees temàtiques de la UPC], 010308 nuclear & particles physics, Time-of-flight, Neutron temperature, Neutron capture, N_TOF, Neutron source, Física nuclear, TIME OF FLIGHT, Spallation
Abstract: 5 pages, 2 figures.-- PACS nrs.: 29.25; 28.20.−v; 24.30.−v; 98.80.-- ISI Article Identifier: 000248784100221, Printed version published Aug 2007.-- Issue title: The Application of Accelerators in Research and Industry - Proceedings of the Nineteenth International Conference on The Application of Accelerators in Research and Industry (Fort Worth, TX, Aug 20-25, 2006)., 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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206. Photoactivation of180Tamand Its Implications for the Nucleosynthesis of Nature's Rarest Naturally Occurring Isotope

Author: P. von Neumann-Cosel, Achim Richter, Joachim Enders, J. de Boer, James Carroll, M. Schumann, A. Nord, H. J. Maier, U. Kneissl, Andreas Zilges, H. H. Pitz, M. Loewe, Stephan Volz, F. Käppeler, Peter Mohr, C. Arlandini, H. Kaiser, Timo Hartmann, J. Besserer, D. Belic, and H. Maser
Subjects: Physics, Nuclear physics, Isotope, Nucleosynthesis, General Physics and Astronomy
Published: 1999
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207. Resonance capture cross section of 207Pb

Author: C. Domingo Pardo, U. Abbondanno, G. Aerts, H. Álvarez Pol, F. Alvarez Velarde, S. Andriamonje, J. Andrzejewski, P. Assimakopoulos, 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. Cortes, A. Couture, J. Cox, M. Dahlfors, S. David, I. Dillman, R. Dolfini, W. Dridi, I. Duran, C. Eleftheriadis, M. Embid Segura, L. Ferrant, A. Ferrari, R. Ferreira Marques, L. Fitzpatrick, H. Frais Koelbl, K. Fujii, W. Furman, R. Gallino, I. Goncalves, E. Gonzalez Romero, A. Goverdovski, F. Gramegna, E. Griesmayer, C. Guerrero, F. Gunsing, B. Haas, R. Haight, M. Heil, A. Herrera Martinez, M. Igashira, S. Isaev, E. Jericha, Y. Kadi, F. Käppeler, D. Karamanis, D. Karadimos, M. Kerveno, V. Ketlerov, P. Koehler, V. Konovalov, E. Kossionides, M. Krtička, C. Lamboudis, H. Leeb, A. Lindote, I. Lopes, M. Lozano, S. Lukic, J. Marganiec, S. Marrone, P. Mastinu, A. Mengoni, P. M. Milazzo, C. Moreau, M. Mosconi, F. Neves, H. Oberhummer, M. Oshima, S. O'Brien, J. Pancin, C. Papachristodoulou, C. Papadopoulos, C. Paradela, N. Patronis, A. Pavlik, P. Pavlopoulos, L. Perrot, R. Plag, A. Plompen, A. Plukis, A. Poch, C. Pretel, J. Quesada, T. Rauscher, R. Reifarth, M. Rosetti, C. Rubbia, G. Rudolf, P. Rullhusen, J. Salgado, L. Sarchiapone, I. Savvidis, C. Stephan, G. Tagliente, J. L. Tain, L. Tassan Got, L. Tavora, R. Terlizzi, P. Vaz, A. Ventura, D. Villamarin, M. C. Vincente, V. Vlachoudis, R. Vlastou, F. Voss, S. Walter, H. Wendler, M. Wiescher, K. Wisshak, VANNINI, GIANNI, 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), 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, and K. Wisshak(n_TOF Collaboration)
Subjects: 25.40.Lw, 27.80.+w, 97.10.Cv, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Nuclear Physics - Experiment, S-PROCESS AND R-PROCESS, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment (nucl-ex), NEUTRON TIME OF FLIGHT, Nuclear Experiment, NEUTRON CAPTURE CROSS SECTION
Abstract: The radiative neutron capture cross section of 207Pb has been measured at the CERN neutron time of flight installation n_TOF using the pulse height weighting technique in the resolved energy region. The measurement has been performed with an optimized setup of two C6D6 scintillation detectors, which allowed us to reduce scattered neutron backgrounds down to a negligible level. Resonance parameters and radiative kernels have been determined for 16 resonances by means of an R-matrix analysis in the neutron energy range from 3 keV to 320 keV. Good agreement with previous measurements was found at low neutron energies, whereas substantial discrepancies appear beyond 45 keV. With the present results, we obtain an s-process contribution of 77(8)% to the solar abundance of 207Pb. This corresponds to an r-process component of 23(8)%, which is important for deriving the U/Th ages of metal poor halo stars., 7 pages, 3 figures, to be published in Phys. Rev. C
Published: 2006
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208. Lifetime measurement in176Luand its astrophysical consequences

Author: S. Jaag, F. Käppeler, H.G. Börner, W. Andrejtscheff, and C. Doll
Subjects: Physics, Nuclear and High Energy Physics, chemistry, Red giant, Radiative capture, Thermal equilibration, chemistry.chemical_element, Slow neutron, Atomic physics, Ground state, Helium
Abstract: Because of its temperature-dependent half-life, ${}^{176}\mathrm{Lu}$ represents an important thermometer for the slow neutron capture process $(s$ process) which accounts for the origin of about half of the abundances between Fe and Bi. This interpretation of the observed ${}^{176}\mathrm{Lu}$ abundance has been improved by a new lifetime measurement of the ${J}^{\ensuremath{\pi}}{=5}^{\ensuremath{-}}$ state at 838 keV in ${}^{176}\mathrm{Lu}.$ The present limit of ${\ensuremath{\tau}}_{838}g~10 \mathrm{ps}$ provides a more stringent constraint for the thermal equilibration between the long-lived ground state ${(t}_{1/2}=41 \mathrm{Gyr})$ and the short-lived K isomer at 123 keV ${(t}_{1/2}=3.7 \mathrm{h}),$ and, hence, for the resulting estimate of the temperature during shell helium burning in red giant stars.
Published: 1999
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209. The origin of the heavy elements: The s process

Author: F. Käppeler
Subjects: Physics, Nuclear and High Energy Physics, Neutron capture, Supernova, Stellar nucleosynthesis, Stable isotope ratio, Astrophysics::Solar and Stellar Astrophysics, r-process, Supernova nucleosynthesis, Astrophysics, s-process, Astrophysics::Galaxy Astrophysics, p-process
Abstract: The heavy elements with Z≥30 are made in about equal quantities by neutron capture reactions during stellar He burning and presumably in supernovae. This contribution deals mainly with the slow neutron capture ( s ) process which is responsible for about one half of the abundances in the mass region between Fe and Bi. The slow time scale implies that the reaction path of this process involves mostly stable isotopes which can be studied in detail in laboratory experiments. Based on these data, the quantitative interpretation of the natural abundances provides an exciting possibility for exploring a variety of problems related to stellar and Galactic evolution. The p process, which provides a very small but significant admixture to many of the s abundances, has recently attracted increasing interest as a possibility for supernova studies.
Published: 1999
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210. CURRENT QUESTS IN NUCLEAR ASTROPHYSICS AND EXPERIMENTAL APPROACHES

Author: F. Käppeler, Friedrich-Karl Thielemann, and Michael Wiescher
Subjects: Physics, Nuclear and High Energy Physics, Explosive material, Astrophysics::High Energy Astrophysical Phenomena, Nuclear physics, Supernova, Stellar nucleosynthesis, Nucleosynthesis, Systems engineering, Nuclear astrophysics, Astrophysics::Solar and Stellar Astrophysics, Astrophysical plasma, Current (fluid), Stellar evolution, Astrophysics::Galaxy Astrophysics
Abstract: ▪ Abstract This review summarizes current problems and questions in experimental nuclear astrophysics. It focuses on the present need for experimental data, emphasizing novel methods and approaches. Starting with an overview on nuclear energy generation and nucleosynthesis in an astrophysical plasma, the discussion concentrates on crucial problems related to the various aspects of stellar evolution, from the hydrostatic stage through the advanced burning scenarios up to and including the supernova explosion mechanism. Innovative experimental approaches are needed to pursue the associated questions in stellar nucleosynthesis. Particular emphasis is given to the potential use of radioactive ion beams and their importance for characterizing explosive nucleosynthesis in X-ray bursts and supernovae.
Published: 1998
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211. The (n, γ) Cross Section of7Li

Author: Michael Wiescher, Alberto Mengoni, Michael Heil, and F. Käppeler
Subjects: Big Bang, Nuclear physics, Nuclear reaction, Physics, Cross section (physics), Big Bang nucleosynthesis, Space and Planetary Science, Nucleosynthesis, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, Astronomy and Astrophysics, Neutron, Solar neutrino problem
Abstract: The 7Li(n, γ)8Li reaction has relevance for primordial nucleosynthesis in inhomogeneous big bang models as well as in connection with the solar neutrino problem, where the mirror reaction 7Be(p, γ)8Be is responsible for the production of high-energy solar neutrinos. The cross section was measured at neutron energies of En = 5 meV and En = 54 keV. With the present results and a reanalysis of a previous measurement, the discrepancies among existing data could be resolved and the cross section can be determined with improved accuracy.
Published: 1998
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212. Coulomb excitation of180Ta

Author: R. Böttger, H. Schölermann, F. Käppeler, and M. Schumann
Subjects: Physics, Nuclear and High Energy Physics, education.field_of_study, Population, Tantalum, chemistry.chemical_element, Coulomb excitation, Coupling (probability), chemistry, Intermediate state, Atomic physics, Ground state, education, Energy (signal processing), Excitation
Abstract: The existence of a low energetic intermediate state (IS) in ${}^{180}\mathrm{Ta}$ which provides a coupling of the stable isomer and the radioactive ground state was investigated by means of Coulomb excitation. Natural tantalum foils were irradiated by protons with incident energies between 3.0 and 3.7 MeV, and with $\ensuremath{\alpha}$ particles in the energy range $12\ensuremath{-}20 \mathrm{MeV}.$ Subsequently, the foils were counted for the induced ground state activity of ${}^{180}\mathrm{Ta}.$ From the thick target yields an IS between 0.6 and 2.2 MeV excitation energy was inferred. The population of the IS in the stellar environment of the $s$ process depends critically on the prevailing temperatures. Current stellar models suggest $s$-process temperatures below $3.1\ifmmode\times\else\texttimes\fi{}{10}^{8} \mathrm{K}$ which lead to a negligible population of intermediate states above 1.2 MeV. Thus, the present data do not allow stringent conclusions about the destruction of ${}^{180}\mathrm{Ta}$ under these conditions, but an $s$ process origin seems still possible. Furthermore, the experiments support the existence of a new isomer in ${}^{184}\mathrm{Re}.$
Published: 1998
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213. Proton capture cross sections of the ruthenium isotopes

Author: Hendrik Schatz, J. Bork, Thomas Rauscher, and F. Käppeler
Subjects: Physics, Nuclear and High Energy Physics, Range (particle radiation), Thin layers, Isotope, Proton, chemistry.chemical_element, p-process, law.invention, Ruthenium, Nuclear physics, chemistry, law, Van de Graaff generator, Irradiation, Atomic physics
Abstract: The proton capture cross sections of the stable ruthenium isotopes 96, 98, 99, and 104 have been measured by means of the activation method in the proton energy range between 1.5 and 3 MeV. Thin layers of natural ruthenium were irradiated at the Karlsruhe 3.75 MV Van de Graaff accelerator with proton beams of 20-50 mu A. The activity induced by (p,gamma) reactions was measured with a calibrated HPGe detector. In this way, six (p,gamma) cross sections for populating ground states and isomers in four different Rh isotopes could be determined simultaneously with systematic uncertainties of typically 4-5 fact that experimental data are almost completely missing in the A
Published: 1998
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214. On the Puzzling Origin of the Rare In and Sn Isotopes

Author: F. Voss, Ch. Theis, K. Wisshak, and F. Käppeler
Subjects: Physics, Nuclear reaction, Isotope, Stable isotope ratio, Significant difference, chemistry.chemical_element, Astronomy and Astrophysics, Astrophysics, Nuclear physics, chemistry, Space and Planetary Science, Nucleosynthesis, Neutron, Activation method, Tin
Abstract: The neutron-capture cross sections of the stable isotopes 106Cd,108Cd,114Cd, and 116Cd have been measured relative to gold by means of the activation method, using the quasi-stellar neutron spectrum for kT = 25 keV that can be produced via the 7Li(p, n)7Be reaction near threshold. These data are given with uncertainties between 3% and 6%, five times smaller than quoted for most of the few previous experiments. The present results complement recent measurements on isotopes of tin and a discussion of the stellar β-decay rates in the A = 113/115 region, and allow an update of the nucleosynthetic origin of the Cd/In/Sn isotopes, which is complicated by the s-process branchings at 113Cd,115Cd, and 115In as well as by the many isomers in this mass region. The s-process yields obtained with the classical s-process and with an AGB model exhibit a significant difference with respect to the cadmium and tin abundances, with interesting consequences for the r-process residuals in this mass region. Nevertheless, the origin of the rare, odd isotopes 113In and 115Sn remains unclear. The cross sections for the two light Cd isotopes, 106 and 108, are of interest for testing Hauser-Feshbach extrapolations to the p-process region.
Published: 1998
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215. Neutron capture resonances in 142Nd and 144Nd

Author: K. Wisshak, F. Voss, and F. Käppeler
Subjects: Rare earth nuclei, Physics, Nuclear reaction, Nuclear and High Energy Physics, Angular momentum, Neutron capture, Excited state, Radiative capture, Resonance, Nuclear cross section, Atomic physics
Abstract: The neutron capture cross sections of ${}^{142}\mathrm{Nd}$ and ${}^{144}\mathrm{Nd}$ which were determined recently with the Karlsruhe $4\ensuremath{\pi}{\mathrm{BaF}}_{2}$ detector have been reanalyzed at low energies. The parameters of 52 resonances in ${}^{142}\mathrm{Nd}$ and of 78 resonances in ${}^{144}\mathrm{Nd}$ were extracted by means of a shape analysis program, yielding a more reliable determination of the averaged cross sections below 20 keV. This study confirms the previously reported stellar cross sections, so that the $s$-process study based on these data remains unchanged.
Published: 1998
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216. Stellar neutron capture cross sections of the Nd isotopes

Author: K. Wisshak, L. Kazakov, F. Voss, F. Käppeler, and G. Reffo
Subjects: Physics, Nuclear and High Energy Physics, Barium fluoride, chemistry.chemical_element, Neodymium, Nuclear physics, chemistry.chemical_compound, Neutron capture, chemistry, Nucleosynthesis, Neutron number, r-process, Neutron, Atomic physics, s-process
Abstract: The neutron capture cross sections of {sup 142}Nd, {sup 143}Nd, {sup 144}Nd, {sup 145}Nd, {sup 146}Nd, and {sup 148}Nd have been measured in the energy range from 3 to 225 keV at the Karlsruhe 3.75 MV Van de Graaff accelerator. Neutrons were produced via the {sup 7}Li(p,n){sup 7}Be reaction by bombarding metallic Li targets with a pulsed proton beam. Capture events were registered with the Karlsruhe 4{pi} Barium Fluoride Detector. The cross sections were determined relative to the gold standard. The experiment was difficult due to the small cross sections of the even isotopes at or near the magic neutron number N=82, and also since the isotopic enrichment of some samples was comparably low. The necessary corrections for capture of scattered neutrons and for isotopic impurities could be determined reliably thanks to the high efficiency and the spectroscopic quality of the BaF{sub 2} detector, resulting in a consistent set of (n,{gamma}) cross sections for the six stable neodymium isotopes involved in the s process with typical uncertainties of 1.5{endash}2{percent}. From these data, Maxwellian averaged cross sections were calculated between kT=10 and 100 keV. The astrophysical implications of these results were investigated in an s-process analysis, which deals with the rolemore » of the s-only isotope {sup 142}Nd for the N{sub s}{l_angle}{sigma}{r_angle} systematics near the magic neutron number N=82, the decomposition of the Nd abundances into the respective r-, s-, and p-process components, and the interpretation of isotopic anomalies in meteoritic material. {copyright} {ital 1998} {ital The American Physical Society}« less
Published: 1998
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217. The nucleosynthesis of heavy elements in Stars: the key isotope 25Mg

Author: P. F. Mastinu, K. Fraval, M. Krtička, F. Calviño, T. Martinez, A. J. M. Plompen, J. L. Tain, Rene Reifarth, E. Chiaveri, Javier Praena, J. M. Quesada, L. Tassan-Got, F. Mingrone, J. Andrzejewski, F. Gunsing, C. Lampoudis, A. Riego, Srinivasan Ganesan, A. K. Saxena, G. Tagliente, Arnaud Ferrari, A. Pavlik, A. Hernández-Prieto, Cristian Massimi, Mario Barbagallo, A. Mallick, G. Vannini, C. Domingo-Pardo, M. Sabaté-Gilarte, F. Cerutti, Carlos Guerrero, Alberto Mengoni, T. Ware, Jeri Kroll, E. Griesmayer, A. Ventura, C. Rubbia, Roberto Losito, R. Sarmento, A. Tsinganis, G. Cortes, D. Tarrío, P. E. Koehler, P. Vaz, G. Giubrone, Rugard Dressler, E. Jericha, C. Paradela, I. Duran, L. Audouin, N. Kivel, Dorothea Schumann, Nicola Colonna, L.S. Leong, Vasilis Vlachoudis, C. Weiß, P. M. Milazzo, M. Mastromarco, C. Carrapiço, Anton Wallner, F. Bečvář, W. Mondalaers, E. Mendoza, Stefan Kopecky, D. G. Jenkins, Peter Schillebeeckx, F. Käppeler, S. Altstadt, V. Bécares, M. A. Cortés-Giraldo, R. Vlastou, E. Berthoumieux, Petar Žugec, A. Manousos, J. Marganiec, J. Billowes, M. S. Robles, D. Cano-Ott, M. Diakaki, T. J. Wright, I. F. Gonçalves, Fabio Belloni, Sebastian Schmidt, M. Mirea, H. Leeb, J. Perkowski, Mario Weigand, Damir Bosnar, Y. Kadi, S. Valenta, Marco Calviani, M. J. Vermeulen, V. Variale, E. Leal-Cidoncha, C. Eleftheriadis, Thomas Rauscher, D. Karadimos, E. González-Romero, M. P. W. Chin, A. R. García, M. Brugger, Christoph Langer, C. Lederer, Mengoni, A., 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, Lunardi, S., Massimi, C., Koehler, P., Kopecky, S., Mingrone, F., Schillebeeckx, P., Vannini, G., Altstadt, S., Andrzejewski, J., Audouin, L., Barbagallo, M., Bécares, V., Bečvář, F., Belloni, F., Berthoumieux, E., Billowes, J., Bosnar, D., Brugger, M., Calviani, M., Calviño, F., Cano-Ott, D., Carrapiço, C., Cerutti, F., Chiaveri, E., Chin, M., Colonna, N., Cortés, G., Cortés-Giraldo, M.A., Diakaki, M., Domingo-Pardo, C., Duran, I., Dressler, R., Eleftheriadis, C., Ferrari, A., Fraval, K., Ganesan, S., García, A.R., Giubrone, G., Gonçalves, I.F., González-Romero, E., Griesmayer, E., Guerrero, C., Gunsing, F., Hernández-Prieto, A., Jenkins, D.G., Jericha, E., Kadi, Y., Käppeler, F., Karadimos, D., Kivel, N., Krtička, M., Kroll, J., Lampoudis, C., Langer, C., Leal-Cidoncha, E., Lederer, C., Leeb, H., Leong, L.S., Losito, R., Mallick, A., Manousos, A., Marganiec, J., Martínez, T., Mastinu, P.F., Mastromarco, M., Mendoza, E., Milazzo, P.M., Mirea, M., Mondalaers, W., Paradela, C., Pavlik, A., Perkowski, J., Plompen, A., Praena, J., Quesada, J.M., Rauscher, T., Reifarth, R., Riego, A., Robles, M.S., Rubbia, C., Sabaté-Gilarte, M., Sarmento, R., Saxena, A., Schmidt, S., Schumann, D., Tagliente, G., Tain, J.L., Tarrío, D., Tassan-Got, L., Tsinganis, A., Valenta, S., Variale, V., Vaz, P., Ventura, A., Vermeulen, M.J., Vlachoudis, V., Vlastou, R., Wallner, A., Ware, T., Weigand, M., Weiß, C., Wright, T., and Žugec, P.
Subjects: Physics, Nuclear reaction, Energies::Energia nuclear [Àrees temàtiques de la UPC], Isotope, Stable isotope ratio, Physics::Instrumentation and Detectors, 25Mg, stellar nucleosynthesis, neutron capture, Astrophysics::High Energy Astrophysical Phenomena, QC1-999, Nuclear energy, Neutron temperature, Nuclear physics, Physics and Astronomy (all), Nucleosynthesis, Energia nuclear, Neutron, s-process, Nuclear Experiment, Isotopes of magnesium
Abstract: We have measured the radiative neutron-capture cross section and the total neutron-induced cross section of one of the most important isotopes for the s process, the 25Mg. The measurements have been carried out at the neutron time-of-flight facilities n-TOF at CERN (Switzerland) and GELINA installed at the EC-JRC-IRMM (Belgium). The cross sections as a function of neutron energy have been measured up to approximately 300 keV, covering the energy region of interest to the s process. The data analysis is ongoing and preliminary results show the potential relevance for the s process. © Owned by the authors, published by EDP Sciences, 2014.
Published: 2014

218. Novel method to study neutron capture of 235U and 238U simultaneously at keV energies

Author: A, Wallner, T, Belgya, M, Bichler, K, Buczak, I, Dillmann, F, Käppeler, C, Lederer, A, Mengoni, F, Quinto, P, Steier, and L, Szentmiklosi
Abstract: The neutron capture cross sections of the main uranium isotopes, (235)U and (238)U, were measured simultaneously for keV energies, for the first time by combining activation technique and atom counting of the reaction products using accelerator mass spectrometry. New data, with a precision of 3%-5%, were obtained from mg-sized natural uranium samples for neutron energies with an equivalent Maxwell-Boltzmann distribution of kT ∼ 25 keV and for a broad energy distribution peaking at 426 keV. The cross-section ratio of (235)U(n,γ)/(238)U(n,γ) can be deduced in accelerator mass spectrometry directly from the atom ratio of the reaction products (236)U/(239)U, independent of any fluence normalization. Our results confirm the values at the lower band of existing data. They serve as important anchor points to resolve present discrepancies in nuclear data libraries as well as for the normalization of cross-section data used in the nuclear astrophysics community for s-process studies.
Published: 2014

219. Study of 234U(n,f) resonances measured at the CERN n TOF facility

Author: B. Berthier, E. Kossionides, Javier Praena, V. Chepel, B. Haas, J. Marganiec, P. Cennini, S. Andriamonje, G. Vannini, C. Lampoudis, S. David, G. Tagliente, S. Lukic, E. Chiaveri, Corrie S. Moreau, W. Dridi, S. Walter, P. Baumann, A. Pavlik, Ralf Plag, P. F. Mastinu, P. E. Koehler, M. Mosconi, M. Kerveno, A. Ventura, C. Domingo-Pardo, L. Sarchiapone, R. Vlastou, C. Pretel, A. J. M. Plompen, J. Salgado, C. Stephan, S. O'Brien, Rene Reifarth, M. Embid-Segura, G. Aerts, E. Berthoumieux, F. Voss, A. Poch, P. Pavlopoulos, J. M. Quesada, L. Tassan-Got, G. Cortes, G. Rudolf, I. Lopes, I. Dillmann, D. Tarrío, Manuel Lozano, Matthias Heil, M. Oshima, Nicola Colonna, R. Terlizzi, L.S. Leong, Carlos Guerrero, M. C. Vincente, James L. Cox, Marco T. Pigni, Vasilis Vlachoudis, I. Duran, J. Andrzejewski, A. Herrera-Martinez, L. Tavora, Heinz Oberhummer, F. Gramegna, Arnaud Ferrari, Roberto Capote, Masayuki Igashira, D. Cano-Ott, Y. Kadi, A. Plukis, L. Perrot, F. Käppeler, E. Leal-Cidoncha, C. Eleftheriadis, P. Rullhusen, L. Ferrant, W.I. Furman, C. Carrapiço, S. Isaev, Thomas Rauscher, K. Fujii, R. C. Haight, F. Alvarez-Velarde, Marco Calviani, U. Abbondanno, M. Krtička, F. Calviño, Alberto Mengoni, D. Karadimos, M. Dahlfors, C. Paradela, K. Wisshak, R. Ferreira-Marques, T. Martinez, P. Vaz, I. Savvidis, Gerald Badurek, E. González-Romero, L. Audouin, H. Álvarez, Aaron Couture, J. L. Tain, Michael Wiescher, J. Pancin, C. T. Papadopoulos, D. Villamarin, C. Rubbia, Isabel S. Gonçalves, S. Marrone, A. Lindote, H. Leeb, E. Jericha, F. Gunsing, D. Trubert, Cristian Massimi, F. Neves, P. M. Milazzo, C. Santos, F. Bečvář, C. Le Naour, 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: Physics, Nuclear reaction, Neutrons, Energies::Energia nuclear [Àrees temàtiques de la UPC], Nuclear and High Energy Physics, Fission, Large Hadron Collider, Cross section, TOF, Resonance, Nuclear data, Neutron, Nuclear physics, Cross section (physics), Neutron cross section, Nuclear Reactions
Abstract: We present the analysis of the resolved resonance region for the 234U(n,f) cross section data measured at the CERN n TOF facility. The resonance parameters in the energy range from 1 eV to 1500 eV have been obtained with the SAMMY code by using as initial parameters for the fit the resonance parameters of the JENDL-3.3 evaluation. In addition, the statistical analysis has been accomplished, partly with the SAMDIST code, in order to study the level spacing and the Mehta-Dyson correlation.
Published: 2014

220. Measurements of neutron cross sections for advanced nuclear energy systems at n-TOF (CERN)

Author: Srinivasan Ganesan, M. Mirea, A. Hernández-Prieto, G. Vannini, H. Leeb, J. L. Tain, J. Perkowski, W. Mondalaers, V. Variale, Christoph Langer, F. Gunsing, G. Tagliente, N. Kivel, Rene Reifarth, A. Manousos, Cristian Massimi, Stefan Schmidt, A. Riego, T. J. Wright, J. M. Quesada, G. Cortes, J. Marganiec, M. Krtička, D. Tarrío, L. Tassan-Got, G. Giubrone, F. Calviño, C. Rubbia, Petar Žugec, A. K. Saxena, Arnaud Ferrari, T. Martinez, Roberto Losito, J. Billowes, F. Mingrone, J. Andrzejewski, F. Bečvář, Mario Weigand, M. Mastromarco, E. Chiaveri, P. F. Mastinu, E. Mendoza, F. Käppeler, Massimo Barbagallo, C. Carrapiço, Anton Wallner, Rugard Dressler, A. Pavlik, C. Lampoudis, D. Cano-Ott, A. Ventura, Peter Schillebeeckx, C. Lederer, N. Colonna, C. Domingo-Pardo, M. Diakaki, P. M. Milazzo, A. Tsinganis, R. Vlastou, E. Berthoumieux, Alberto Mengoni, M. Sabaté-Gilarte, L.S. Leong, I. F. Gonçalves, Vasilis Vlachoudis, E. Leal-Cidoncha, K. Fraval, S. Altstadt, C. Paradela, Fabio Belloni, C. Eleftheriadis, L. Audouin, V. Bécares, Thomas Rauscher, Damir Bosnar, D. Karadimos, P. Vaz, E. González-Romero, Y. Kadi, E. Jericha, Dorothea Schumann, M. P. W. Chin, C. Weiß, Carlos Guerrero, A. R. García, M. Brugger, M. J. Vermeulen, P. E. Koehler, S. Valenta, F. Cerutti, Marco Calviani, I. Duran, T. Ware, E. Griesmayer, Javier Praena, D. G. Jenkins, M. A. Cortés-Giraldo, Jeri Kroll, R. Sarmento, A. J. M. Plompen, Ventura, A., Mengoni, A., 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, Lunardi, S., Barbagallo, M., Colonna, N., Altstadt, S., Andrzejewski, J., Audouin, L., Bécares, V., Bečvář, F., Belloni, F., Berthoumieux, E., Billowes, J., Bosnar, D., Brugger, M., Calviani, M., Calviño, F., Cano-Ott, D., Carrapiço, C., Cerutti, F., Chiaveri, E., Chin, M., Cortés, G., Cortés-Giraldo, M.A., Diakaki, M., Domingo-Pardo, C., Duran, I., Dressler, R., Eleftheriadis, C., Ferrari, A., Fraval, K., Ganesan, S., García, A.R., Giubrone, G., Gonçalves, I.F., González-Romero, E., Griesmayer, E., Guerrero, C., Gunsing, F., Hernández-Prieto, A., Jenkins, D.G., Jericha, E., Kadi, Y., Käppeler, F., Karadimos, D., Kivel, N., Koehler, P., Krtička, M., Kroll, J., Lampoudis, C., Langer, C., Leal-Cidoncha, E., Lederer, C., Leeb, H., Leong, L.S., Losito, R., Manousos, A., Marganiec, J., Martínez, T., Massimi, C., Mastinu, P.F., Mastromarco, M., Mendoza, E., Milazzo, P.M., Mingrone, F., Mirea, M., Mondalaers, W., Paradela, C., Pavlik, A., Perkowski, J., Plompen, A., Praena, J., Quesada, J.M., Rauscher, T., Reifarth, R., Riego, A., Rubbia, C., Sabaté-Gilarte, M., Sarmento, R., Saxena, A., Schillebeeckx, P., Schmidt, S., Schumann, D., Tagliente, G., Tain, J.L., Tarrío, D., Tassan-Got, L., Tsinganis, A., Valenta, S., Vannini, G., Variale, V., Vaz, P., Vermeulen, M.J., Vlachoudis, V., Vlastou, R., Wallner, A., Ware, T., Weigand, M., Weiß, C., Wright, T., and Žugec, P.
Subjects: Nuclear reaction, Physics, Energies::Energia nuclear [Àrees temàtiques de la UPC], QC1-999, Nuclear Theory, Nuclear data, Nuclear energy, Neutron radiation, Nuclear physics, Uranium-236, Physics and Astronomy (all), Plutonium-242, Nuclear astrophysics, Neutron source, Energia nuclear, Physics::Accelerator Physics, Neutron, neutron cross sections, n_TOF, advanced nuclear energy systems, Nuclear Experiment
Abstract: The n-TOF facility operates at CERN with the aim of addressing the request of high accuracy nuclear data for advanced nuclear energy systems as well as for nuclear astrophysics. Thanks to the features of the neutron beam, important results have been obtained on neutron induced fission and capture cross sections of U, Pu and minor actinides. Recently the construction of another beam line has started; the new line will be complementary to the first one, allowing to further extend the experimental program foreseen for next measurement campaigns. © Owned by the authors, published by EDP Sciences, 2014.
Published: 2014

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

Author: S. Valenta, Marco Calviani, R. Vlastou, Damir Bosnar, M. Meaze, M. J. Vermeulen, Srinivasan Ganesan, Mario Barbagallo, F. Gunsing, Cristian Massimi, F. Bečvář, V. Bécares, E. Jericha, Dorothea Schumann, C. Weiß, Mario Weigand, Alfredo Ferrari, M. Mirea, Rene Reifarth, M. B. Gómez-Hornillos, Stefan Schmidt, Vittorio Boccone, L. Audouin, H. Leeb, J. M. Quesada, P. M. Milazzo, S. Altstadt, J. Perkowski, Rugard Dressler, E. Chiaveri, D. Cano-Ott, G. Cortes, D. G. Jenkins, Laurent Tassan-Got, G. Giubrone, F. Käppeler, A. Tsinganis, C. Eleftheriadis, D. Tarrío, A. Hernández-Prieto, E. Mendoza, C. Lampoudis, Peter Schillebeeckx, R. Versaci, N. Dzysiuk, Yacine Kadi, Nicola Colonna, L.S. Leong, F. Mingrone, J. Andrzejewski, M. Kokkoris, P. Vaz, J. Billowes, Carlo Rubbia, M. Mastromarco, Alberto Ventura, E. Griesmayer, T. J. Wright, Cortés-Giraldo, C. Langer, V. Vlachoudis, A. Pavlik, Carlos Guerrero, C. Domingo-Pardo, N. Kivel, C. Carrapiço, Anton Wallner, M. Sabaté-Gilarte, A. K. Saxena, E. Berthoumieux, C. Paradela, P. Gurusamy, M. Diakaki, W. Mondalaers, A. Mallick, G. Vannini, Roberto Losito, Petar Žugec, A. Manousos, F. Cerutti, Javier Praena, Fabio Belloni, M. P. W. Chin, F. Roman, E. Leal-Cidoncha, I. Goncalves, G. Tagliente, Thomas Rauscher, D. Karadimos, A. R. García, M. Brugger, T. Ware, V. Variale, Robles, P. E. Koehler, Alberto Mengoni, J. L. Tain, I. Duran, A. Riego, Gerald Badurek, C. Lederer, J. Marganiec, P. F. Mastinu, M. Krtička, F. Calviño, T. Martinez, E. Gonzalez-Romero, K. Fraval, A. J. M. Plompen, Jeri Kroll, R. Sarmento, Ventura, A., Mengoni, A., Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, n_TOF Collaboration, 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, and 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)
Subjects: Physics, Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, Nuclear and High Energy Physics, Cross section, TOF, Resonance, Nuclear data, Diamond, Alpha particle, Neutron, engineering.material, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 59Ni, neutron capture, n_TOF, s-proces branching point, Nuclear physics, Nuclear reactins, engineering, Nuclear astrophysics, s-process, Embrittlement, Nucleosynthesis
Abstract: See paper for full list of authors; International audience; The (n, α) 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, α)56Fe cross section. The results of this measurement, with special emphasis on the dominant resonance at 203 eV, are presented here.
Published: 2014
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222. The CERN n_TOF Facility: Neutron Beams Performances for Cross Section Measurements

Author: F. Mingrone, J. Andrzejewski, C. Langer, N. Kivel, V. Bécares, C. Lederer, A. R. García, P. Gurusamy, G. Tagliente, M. Brugger, Rene Reifarth, E. Jericha, Stefan Schmidt, I. F. Gonçalves, M. Mastromarco, Vittorio Boccone, J. M. Quesada, Dorothea Schumann, L. Tassan-Got, J. L. Tain, S. Valenta, A. Mallick, G. Vannini, G. Cortes, T. J. Wright, D. Tarrío, Marco Calviani, Fabio Belloni, C. Carrapiço, Anton Wallner, C. Paradela, M. Krtička, L. Audouin, A. Hernández-Prieto, S. Altstadt, A. K. Saxena, Arnaud Ferrari, G. Giubrone, T. Martinez, A. Riego, Alberto Mengoni, E. Leal-Cidoncha, C. Eleftheriadis, Thomas Rauscher, V. Variale, W. Mondalaers, Petar Žugec, F. Cerutti, A. Manousos, Srinivasan Ganesan, F. Bečvář, F. Gunsing, D. Karadimos, J. Marganiec, Cristian Massimi, M. Meaze, M. J. Vermeulen, P. F. Mastinu, Mario Barbagallo, R. Versaci, E. Mendoza, E. González-Romero, M. B. Gómez-Hornillos, M. Kokkoris, Peter Schillebeeckx, N. Dzysiuk, J. Billowes, C. Weiss, R. Vlastou, M. P. W. Chin, Roberto Losito, D. G. Jenkins, Rugard Dressler, Damir Bosnar, Y. Kadi, Javier Praena, M. S. Robles, F. Roman, E. Berthoumieux, A. Tsinganis, F. Käppeler, P. M. Milazzo, Nicola Colonna, D. Cano-Ott, L.S. Leong, I. Duran, Vasilis Vlachoudis, M. Diakaki, M. A. Cortés-Giraldo, Mario Weigand, A. Ventura, K. Fraval, M. Mirea, F. Calviño, H. Leeb, J. Perkowski, P. E. Koehler, T. Ware, E. Griesmayer, Carlos Guerrero, A. J. M. Plompen, P. Vaz, Jeri Kroll, A. Pavlik, R. Sarmento, C. Domingo-Pardo, M. Sabaté-Gilarte, E. Chiaveri, C. Rubbia, C. Lampoudis, E. Chiaveri, S. Altstadt, J. Andrzejewski, L. Audouin, M. Barbagallo, V. Becare, F. Becvar, F. Belloni, E. Berthoumieux, J. Billowe, V. Boccone, D. Bosnar, M. Brugger, M. Calviani, F. Calvino, D. Cano-Ott, C. Carrapico, F. Cerutti, M. Chin, N. Colonna, G. Corte, M. A. Cortes-Giraldo, M. Diakaki, C. Domingo-Pardo, I. Duran, R. Dressler, N. Dzysiuk, C. Eleftheriadi, A. Ferrari, K. Fraval, S. Ganesan, A. R. Garcia, G. Giubrone, M. B. Gomez-Hornillo, I. F. Goncalve, E. Gonzalez-Romero, E. Griesmayer, C. Guerrero, F. Gunsing, P. Gurusamy, A. Hernandez-Prieto, D. G. Jenkin, E. Jericha, Y. Kadi, F. Kaeppeler, D. Karadimo, N. Kivel, P. Koehler, M. Kokkori, M. Krticka, J. Kroll, C. Lampoudi, C. Langer, E. Leal-Cidoncha, C. Lederer, H. Leeb, L. S. Leong, R. Losito, A. Mallick, A. Manouso, J. Marganiec, T. Martinez, C. Massimi, P. F. Mastinu, M. Mastromarco, M. Meaze, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, M. Mirea, W. Mondalaer, C. Paradela, A. Pavlik, J. Perkowski, A. Plompen, J. Praena, J. M. Quesada, T. Rauscher, R. Reifarth, A. Riego, M. S. Roble, F. Roman, C. Rubbia, M. Sabate-Gilarte, R. Sarmento, A. Saxena, P. Schillebeeckx, S. Schmidt, D. Schumann, G. Tagliente, J. L. Tain, D. Tarrio, L. Tassan-Got, A. Tsingani, S. Valenta, G. Vannini, V. Variale, P. Vaz, A. Ventura, R. Versaci, M. J. Vermeulen, V. Vlachoudi, R. Vlastou, A. Wallner, T. Ware, M. Weigand, C. Wei, T. Wright, P. Zugec, 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, Ventura, A., and Mengoni, A.
Subjects: Physics, Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, Nuclear and High Energy Physics, Large Hadron Collider, Cross section, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, TOF, CERN - n_TOF, n_TOF, CERN, cross section measurements, Nuclear data, Beam, Neutron, Neutron radiation, Nuclear physics, Cross section (physics), Neutron flux, High activity, Nuclear Experiment, Beam (structure)
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., JRC.D.4-Standards for Nuclear Safety, Security and Safeguards
Published: 2014

223. Neutron Capture Reactions on Fe and Ni Isotopes for the Astrophysical s-process

Author: A. R. García, M. Brugger, C. Eleftheriadis, Thomas Rauscher, D. Karadimos, E. González-Romero, M. P. W. Chin, T. Ware, F. Roman, E. Griesmayer, E. Chiaveri, J. L. Tain, P. F. Mastinu, Marco Pignatari, S. Valenta, G. Giubrone, J. Billowes, G. Tagliente, Mario Weigand, Marco Calviani, Srinivasan Ganesan, F. Käppeler, M. B. Gómez-Hornillos, P. E. Koehler, E. Jericha, P. Vaz, C. Lederer, M. Mirea, Mario Barbagallo, D. Cano-Ott, Dorothea Schumann, S. Altstadt, M. Diakaki, Jeri Kroll, C. Weiß, A. Pavlik, C. Domingo-Pardo, N. Kivel, F. Bečvář, H. Leeb, Alberto Mengoni, Javier Praena, R. Sarmento, A. Manousos, A. J. M. Plompen, E. Mendoza, Arnaud Ferrari, A. Riego, M. Meaze, Peter Schillebeeckx, M. J. Vermeulen, M. A. Cortés-Giraldo, N. Dzysiuk, J. Perkowski, J. Marganiec, P. Gurusamy, K. Fraval, Carlos Guerrero, I. Duran, P. M. Milazzo, C. Rubbia, M. Krtička, F. Calviño, I. F. Gonçalves, F. Cerutti, V. Bécares, R. Vlastou, F. Gunsing, T. Martinez, M. Mastromarco, M. Kokkoris, Damir Bosnar, Y. Kadi, G. Cortes, C. Carrapiço, Anton Wallner, Cristian Massimi, D. Tarrío, Fabio Belloni, D. G. Jenkins, E. Berthoumieux, G. Vannini, Petar Žugec, W. Mondelaers, V. Variale, Roberto Versaci, F. Mingrone, J. Andrzejewski, T. J. Wright, C. Langer, Roberto Losito, Rugard Dressler, A. Tsinganis, Nicola Colonna, L.S. Leong, Vasilis Vlachoudis, A. Ventura, Gunther Korschinek, C. Paradela, Rene Reifarth, Stefan Schmidt, L. Audouin, Vittorio Boccone, J. M. Quesada, L. Tassan-Got, Ventura, A., Mengoni, A., 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, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, C. Lederer, G. Giubrone, C. Massimi, P. Zugec, M. Barbagallo, N. Colonna, C. Domingo-Pardo, C. Guerrero, F. Gunsing, F. Kaeppeler, J. L. Tain, S. Altstadt, J. Andrzejewski, L. Audouin, V. Becare, F. Becvar, F. Belloni, E. Berthoumieux, J. Billowe, V. Boccone, D. Bosnar, M. Brugger, M. Calviani, F. Calvino, D. Cano-Ott, C. Carrapico, F. Cerutti, E. Chiaveri, M. Chin, G. Corte, M. A. Cortes-Giraldo, M. Diakaki, I. Duran, R. Dressler, N. Dzysiuk, C. Eleftheriadi, A. Ferrari, K. Fraval, S. Ganesan, A. R. Garcia, M. B. Gomez-Hornillo, I. F. Goncalve, E. Gonzalez-Romero, E. Griesmayer, P. Gurusamy, D. G. Jenkin, E. Jericha, Y. Kadi, D. Karadimo, N. Kivel, P. Koehler, M. Kokkori, G. Korschinek, M. Krticka, J. Kroll, C. Langer, H. Leeb, L. S. Leong, R. Losito, A. Manouso, J. Marganiec, T. Martinez, P. F. Mastinu, M. Mastromarco, M. Meaze, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, M. Mirea, W. Mondelaer, C. Paradela, A. Pavlik, J. Perkowski, M. Pignatari, A. Plompen, J. Praena, J. M. Quesada, T. Rauscher, R. Reifarth, A. Riego, F. Roman, C. Rubbia, R. Sarmento, P. Schillebeeckx, S. Schmidt, D. Schumann, G. Tagliente, D. Tarrio, L. Tassan-Got, A. Tsingani, S. Valenta, G. Vannini, V. Variale, P. Vaz, A. Ventura, R. Versaci, M. J. Vermeulen, V. Vlachoudi, R. Vlastou, A. Wallner, T. Ware, M. Weigand, C. Wei, T. J. Wright, and 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)
Subjects: Nuclear and High Energy Physics, Astrophysics::High Energy Astrophysical Phenomena, RADIATIVE NEUTRON CAPTURE, Nuclear Theory, Neutron, Neutron scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Nuclear physics, neutron capture, n_TOF, s-process, Neutron cross section, Nuclear Experiment, capture, Physics, Neutrons, Energies::Energia nuclear [Àrees temàtiques de la UPC], Cross section, TOF, NEUTRON TIME OF FLIGHT, Neutron temperature, Neutron capture, Neutron source, r-process, S PROCESS, Nuclear reactions, Nucleosynthesis
Abstract: See paper for full list of authors; 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.
Published: 2014
Full Text: View/download PDF

224. A Micromegas Detector for Neutron Beam Imaging at the n_TOF Facility at CERN

Author: Stefan Schmidt, C. Eleftheriadis, Thomas Rauscher, Vittorio Boccone, J. M. Quesada, L. Tassan-Got, D. Karadimos, V. Variale, C. Lederer, Arnaud Ferrari, K. Fraval, E. González-Romero, S. Andriamonje, M. Krtička, F. Calviño, A. Manousos, E. Berthoumieux, J. Pancin, F. Gunsing, P. F. Mastinu, A. Pavlik, C. Weiss, R. Vlastou, J. Marganiec, A. Tsinganis, T. Ware, Cristian Massimi, A. R. García, A. Ventura, V. Bécares, Nicola Colonna, L.S. Leong, G. Cortes, C. Domingo-Pardo, Damir Bosnar, G. Tagliente, Vasilis Vlachoudis, M. B. Gómez-Hornillos, M. Brugger, Y. Kadi, D. Tarrío, J. Billowes, R. Versaci, E. Griesmayer, W. Mondalaers, Y. Giomataris, M. Kokkoris, M. Kebbiri, P. Gurusamy, Roberto Losito, T. Papaevangelou, M. P. W. Chin, Srinivasan Ganesan, M. Mirea, I. F. Gonçalves, G. Giubrone, F. Roman, P. M. Milazzo, D. G. Jenkins, F. Bečvář, G. Vannini, M.A. Corté-Giraldo, M. Meaze, D. Cano-Ott, M. J. Vermeulen, M. Mastromarco, F. Mingrone, H. Leeb, J. Andrzejewski, Fabio Belloni, M. Diakaki, A. Riego, Mario Barbagallo, E. Mendoza, J. Perkowski, C. Paradela, S. Valenta, C. Carrapiço, Anton Wallner, C. Langer, E. Jericha, Peter Schillebeeckx, P. E. Koehler, Marco Calviani, L. Audouin, N. Dzysiuk, Mario Weigand, P. Vaz, S. Altstadt, E. Chiaveri, T. Marítnez, I. Duran, T. J. Wright, F. Käppeler, Petar Žugec, Carlos Guerrero, A. J. M. Plompen, F.J. Iguaz, Jeri Kroll, R. Sarmento, Javier Praena, Alberto Mengoni, F. Cerutti, C. Rubbia, J. L. Tain, Rene Reifarth, 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, Ventura, A., and Mengoni, A.
Subjects: Physics, Bonner sphere, Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, MicroMegas detector, Detector, Neutron, Neutron radiation, MGAS, n_TOF, neutron beam imaging, 7. Clean energy, 01 natural sciences, Neutron time-of-flight scattering, Neutron temperature, Nuclear physics, 13. Climate action, 0103 physical sciences, Neutron detection, Nuclear reactions, 010306 general physics, Nuclear Experiment, Beam (structure)
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 knowlodge 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., JRC.D.4-Standards for Nuclear Safety, Security and Safeguards
Published: 2014

225. 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: D. Cano-Ott, P. Vaz, A. R. García, A. J. M. Plompen, A. Pavlik, Carlos Guerrero, F. Mingrone, J. Andrzejewski, C. Domingo-Pardo, S. Valenta, F. Belloni, M. Mirea, M. B. Gómez-Hornillos, Christoph Langer, M. Brugger, W. Mondelaers, A. Riego, Marco Calviani, Roberto Losito, Rugard Dressler, G. Cortes, F. Käppeler, A. Manousos, I. Duran, Petar Žugec, Srinivasan Ganesan, V. Variale, I. F. Gonçalves, D. Tarrío, H. Leeb, J. Perkowski, A. Tsinganis, Arnaud Ferrari, M. A. Cortés-Giraldo, J. L. Tain, C. Eleftheriadis, J. Marganiec, Javier Praena, K. Fraval, Thomas Rauscher, F. Gunsing, A. Ventura, Nicola Colonna, L.S. Leong, Mario Barbagallo, Vasilis Vlachoudis, M. Mastromarco, I. Stetcu, Damir Bosnar, Y. Kadi, T. Ware, C. Paradela, L. Audouin, M. Krtička, F. Calviño, C. Carrapiço, Cristian Massimi, E. Griesmayer, J. Billowes, N. Kivel, D. Karadimos, R. Versaci, F. Cerutti, Jeri Kroll, Anton Wallner, T. Martinez, G. Vannini, M. Kokkoris, G. Giubrone, R. Sarmento, P. Gurusamy, E. González-Romero, C. Rubbia, M. Meaze, M. J. Vermeulen, C. Lederer, J. Balibrea, P. E. Koehler, A. Mengoni, E. Chiaveri, P. F. Mastinu, M. Sabaté, Rene Reifarth, Stefan Schmidt, Marco Pignatari, M. Diakaki, T. J. Wright, Vittorio Boccone, J. M. Quesada, L. Tassan-Got, M. P. W. Chin, Mario Weigand, C. Lampoudis, F. Roman, G. Tagliente, R. Vlastou, E. Berthoumieux, D. G. Jenkins, S. Altstadt, V. Bécares, F. Bečvář, Peter Schillebeeckx, N. Dzysiuk, Toshihiko Kawano, E. Jericha, Dorothea Schumann, C. Weiß, P. M. Milazzo, E. Mendoza, Gunther Korschinek, 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, Ventura, A., and Mengoni, A.
Subjects: Physics, Nuclear reaction, Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, Nuclear and High Energy Physics, Isotope, Fissile material, Cross section, Fission, Physics::Instrumentation and Detectors, TOF, Nuclear data, MicroMegas detector, Neutron, 235U, neutron capture, n_TOF, TAC, MGAS, Nuclear physics, Neutron cross section, Nuclear reactions, Nuclear Experiment
Abstract: Current and future nuclear technologies require more accurate nuclear data on (n,γ) cross sections and the α-ratios of fissile isotopes. Their measurement presents several difficulties, mainly related to the strong fission γ-ray background competing with the weaker γ-ray cascades used as the experimental signature of the (n,γ) process. A specific setup was used at the CERN n TOF facility in 2012 for the measurement of the (n,γ) cross section and α-ratios of fissile isotopes and used for the case of the 235U isotope. The setup consists of a set of micromegas fission detectors surrounding the 235U samples all placed inside a segmented BaF2 Total Absorption Calorimeter., JRC.D.4-Standards for Nuclear Safety, Security and Safeguards
Published: 2014

226. Neutron cross-sections for advanced nuclear systems: The n-TOF project at CERN

Author: G. Tagliente, V. Variale, F. Cerutti, Mario Weigand, M. P. W. Chin, Y. Kadi, C. Lederer, R. Vlastou, E. Chiaveri, C. Paradela, G. Giubrone, P. F. Mastinu, E. Berthoumieux, A. Manousos, S. Valenta, P. Vaz, L. Audouin, Rugard Dressler, Marco Calviani, M. Mirea, Christoph Langer, J. Marganiec, A. Tsinganis, T. Ware, F. Mingrone, J. Andrzejewski, Javier Praena, Petar Žugec, S. Altstadt, A. Ventura, E. Leal-Cidoncha, A. K. Saxena, Arnaud Ferrari, Srinivasan Ganesan, M. Krtička, E. Jericha, C. Eleftheriadis, F. Calviño, E. Griesmayer, L.S. Leong, H. Leeb, Vasilis Vlachoudis, F. Käppeler, Dorothea Schumann, C. Weiß, F. Bečvář, T. Martinez, J. Perkowski, J. Billowes, E. Mendoza, I. F. Gonçalves, M. A. Cortés-Giraldo, M. J. Vermeulen, M. Mastromarco, F. Gunsing, Peter Schillebeeckx, C. Lampoudis, A. Hernández-Prieto, Massimo Barbagallo, Thomas Rauscher, N. Colonna, D. Bosnar, C. Carrapiço, Cristian Massimi, Anton Wallner, Fabio Belloni, D. Karadimos, A. Riego, Jeri Kroll, Roberto Losito, V. Bécares, I. Duran, E. González-Romero, T. J. Wright, D. Cano-Ott, Rene Reifarth, R. Sarmento, K. Fraval, A. J. M. Plompen, M. Diakaki, A. R. García, W. Mondalaers, Carlos Guerrero, M. Brugger, A. Pavlik, C. Domingo-Pardo, D. G. Jenkins, M. Sabaté-Gilarte, P. E. Koehler, P. M. Milazzo, G. Cortes, D. Tarrío, G. Vannini, C. Rubbia, Stefan Schmidt, J. M. Quesada, L. Tassan-Got, Alberto Mengoni, J. L. Tain, Niko Kivel, Sarkadi, L., Barbagallo, M, Mastromarco, M., Colonna, N., Altstadt, S., Andrzejewski, J., Audouin, L., Bécares, V., Bečvář, F., Belloni, F., Berthoumieux, E., Billowes, J., Bosnar, D., Brugger, M., Calviani, M., Calviño, F., Cano-Ott, D., Carrapiço, C., Cerutti, F., Chiaveri, E., Chin, M., Cortés, G., Cortés-Giraldo, M.A., Diakaki, M., Domingo-Pardo, C., Duran, I., Dressler, R., Eleftheriadis, C., Ferrari, A., Fraval, K., Ganesan, S., García, A.R., Giubrone, G., Gonçalves, I.F., González-Romero, E., Griesmayer, E., Guerrero, C., Gunsing, F., Hernández-Prieto, A., Jenkins, D.G., Jericha, E., Kadi, Y., Käppeler, F., Karadimos, D., Kivel, N., Koehler, P., Krtička, M., Kroll, J., Lampoudis, C., Langer, C., Leal-Cidoncha, E., Lederer, C., Leeb, H., Leong, L.S., Losito, R., Manousos, A., Marganiec, J., Martínez, T., Massimi, C., Mastinu, P.F., Mendoza, E., Mengoni, A., Milazzo, P.M., Mingrone, F., Mirea, M., Mondalaers, W., Paradela, C., Pavlik, A., Perkowski, J., Plompen, A., Praena, J., Quesada, J.M., Rauscher, T., Reifarth, R., Riego, A., Rubbia, C., Sabaté-Gilarte, M., Sarmento, R., Saxena, A., Schillebeeckx, P., Schmidt, S., Schumann, D., Tagliente, G., Tain, J.L., Tarrío, D., Tassan-Got, L., Tsinganis, A., Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Vermeulen, M.J., Vlachoudis, V., Vlastou, R., Wallner, A., Ware, T., Weigand, M., Weiss, C., Wright, T., Žugec, P., Universitat Politècnica de Catalunya. Departament de Física, and Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group
Subjects: Nuclear reaction, Computer science, Nuclear engineering, QC1-999, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Nuclear physics, Context (language use), Neutron, 7. Clean energy, 01 natural sciences, Physics and Astronomy (all), Stellar nucleosynthesis, CERN, 0103 physical sciences, n_TOF, 010306 general physics, Nuclear Experiment, Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, Large Hadron Collider, Física [Àrees temàtiques de la UPC], 010308 nuclear & particles physics, Physics, Radioactive waste, Neutron radiation, Engineering physics, Nuclear technology, Time of flight facility, Física nuclear, Nuclear reactions
Abstract: The study of neutron-induced reactions is of high relevance in a wide variety of fields, ranging from stellar nucleosynthesis and fundamental nuclear physics to applications of nuclear technology. In nuclear energy, high accuracy neutron data are needed for the development of Generation IV fast reactors and accelerator driven systems, these last aimed specifically at nuclear waste incineration, as well as for research on innovative fuel cycles. In this context, a high luminosity Neutron Time Of Flight facility, n-TOF, is operating at CERN since more than a decade, with the aim of providing new, high accuracy and high resolution neutron cross-sections. Thanks to the features of the neutron beam, a rich experimental program relevant to nuclear technology has been carried out so far. The program will be further expanded in the near future, thanks in particular to a new high-flux experimental area, now under construction.
Published: 2014

227. Measurement and Analysis of 241Am(n,γ) Cross Sections with C6D6 Detectors at the n TOF Facility at CERN

Author: C. Eleftheriadis, Damir Bosnar, Thomas Rauscher, A. Manousos, Y. Kadi, C. Paradela, L. Audouin, W. Mondalaers, G. Vannini, I. F. Gonçalves, D. Karadimos, R. Versaci, Srinivasan Ganesan, J. Marganiec, P. Vaz, M. Kokkoris, D. G. Jenkins, E. González-Romero, A. Riego, A. Mengoni, Fabio Belloni, M. P. W. Chin, Mario Weigand, T. J. Wright, M. Meaze, I. Duran, M. J. Vermeulen, M. Krtička, E. Jericha, F. Roman, M. Mirea, Mario Barbagallo, Petar Žugec, S. Valenta, J. Billowes, C. Weiß, A. Pavlik, A. Ventura, M. A. Cortés-Giraldo, Marco Calviani, C. Domingo-Pardo, M. B. Gómez-Hornillos, G. Giubrone, Christoph Langer, V. Variale, F. Käppeler, T. Martinez, Roberto Losito, F. Calviño, C. Lederer, T. Ware, H. Leeb, G. Cortes, A. R. García, Arnaud Ferrari, S. Altstadt, P. M. Milazzo, G. Tagliente, Rene Reifarth, D. Tarrío, E. Griesmayer, J. Perkowski, M. Mastromarco, F. Mingrone, M. Brugger, J. Andrzejewski, Stefan Schmidt, A. Tsinganis, C. Carrapiço, V. Bécares, F. Gunsing, P. Gurusamy, Anton Wallner, Vittorio Boccone, J. M. Quesada, Nicola Colonna, L.S. Leong, Vasilis Vlachoudis, L. Tassan-Got, P. E. Koehler, Cristian Massimi, F. Bečvář, D. Cano-Ott, K. Fraval, M. Diakaki, E. Mendoza, Peter Schillebeeckx, N. Dzysiuk, E. Chiaveri, P. F. Mastinu, Javier Praena, C. Rubbia, Carlos Guerrero, A. J. M. Plompen, F. Cerutti, Jeri Kroll, R. Sarmento, J. L. Tain, R. Vlastou, E. Berthoumieux, Ventura, A., Mengoni, A., 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: Physics, Nuclear reaction, Neutrons, Energies::Energia nuclear [Àrees temàtiques de la UPC], Nuclear and High Energy Physics, Range (particle radiation), Large Hadron Collider, Cross section, TOF, Capture, Nuclear data, 241Am, neutron capture, n_TOF, Neutron, Scintillator, Resonance (particle physics), Nuclear physics, Cross section (physics), Nuclear reactions
Abstract: The 241Am(n,gamma) 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 σth = 740 ± 74 barns, which is larger than expected by evaluations and most previous measurements., JRC.D.4-Standards for Nuclear Safety, Security and Safeguards
Published: 2014

228. Measurement of the 238U Radiative Capture Cross Section with C6D6 at the CERN n_TOF Facility

Author: Rene Reifarth, A. J. M. Plompen, Stefan Schmidt, Srinivasan Ganesan, J. M. Quesada, L. Tassan-Got, F. Mingrone, J. Andrzejewski, Mario Barbagallo, Mario Weigand, G. Giubrone, P. Vaz, J. Billowes, M. Mirea, A. Hernández-Prieto, C. Paradela, N. Kivel, L. Audouin, Rugard Dressler, M. S. Robles, M. A. Cortés-Giraldo, G. Tagliente, A. K. Saxena, E. Jericha, A. Tsinganis, Dorothea Schumann, H. Leeb, A. Pavlik, M. Mastromarco, C. Domingo-Pardo, Arnaud Ferrari, C. Weiß, Nicola Colonna, L.S. Leong, Vasilis Vlachoudis, J. Perkowski, C. Carrapiço, M. Sabaté-Gilarte, D. Cano-Ott, S. Valenta, M. Diakaki, K. Fraval, A. Ventura, R. Vlastou, F. Gunsing, Marco Calviani, Anton Wallner, V. Bécares, Jeri Kroll, Cristian Massimi, E. Berthoumieux, W. Mondalaers, A. R. García, A. Manousos, Roberto Losito, P. M. Milazzo, F. Cerutti, R. Sarmento, E. Chiaveri, P. F. Mastinu, J. Marganiec, C. Lampoudis, M. Kokkoris, M. Brugger, Carlos Guerrero, I. F. Gonçalves, M. Krtička, M. J. Vermeulen, F. Calviño, T. Martinez, T. J. Wright, Petar Žugec, Damir Bosnar, Y. Kadi, F. Käppeler, Javier Praena, D. G. Jenkins, Fabio Belloni, S. Altstadt, F. Bečvář, E. Mendoza, Peter Schillebeeckx, E. Leal-Cidoncha, C. Eleftheriadis, Thomas Rauscher, D. Karadimos, E. González-Romero, A. Mengoni, M. P. W. Chin, A. Riego, V. Variale, Christoph Langer, C. Lederer, P. E. Koehler, I. Duran, T. Ware, E. Griesmayer, A. Mallick, G. Vannini, G. Cortes, D. Tarrío, C. Rubbia, J. L. Tain, 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, Ventura, A., and Mengoni, A.
Subjects: Physics, Nuclear reaction, Neutrons, Energies::Energia nuclear [Àrees temàtiques de la UPC], Nuclear and High Energy Physics, Scintillation, Large Hadron Collider, Cross section, Physics::Instrumentation and Detectors, TOF, Nuclear data, Neutron, 238U, neutron capture, n_TOF, C6D6, Nuclear physics, Cross section (physics), Neutron capture, Time of flight, Nuclear reactions, Nuclear Experiment
Abstract: We present the preliminary results of the 238U(n,γ) reaction cross section measurement, performed on April 2012 at the CERN n_TOF facility using C6D6 scintillation detectors over an energy range from thermal to 1 MeV. The goal of this measurement, which is part of a larger proposal, is to reach an uncertainty of 2% in the cross section. The experimental set-up and the methods used to obtain this result are described., JRC.D.4-Standards for Nuclear Safety, Security and Safeguards
Published: 2014
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229. Neutron capture in neodymium isotopes: implications for the s-process

Author: F. Käppeler, F. Voss, L. Kazakov, and K. Wisshak
Subjects: Murchison meteorite, Nuclear physics, Physics, Nuclear and High Energy Physics, Neutron capture, Range (particle radiation), chemistry.chemical_compound, Isotope, chemistry, Barium fluoride, chemistry.chemical_element, s-process, Neodymium
Abstract: The neutron capture cross sections of six neodymium isotopes were measured in the energy range from 3 to 225 keV using the Karlsruhe 4π Barium Fluoride Detector. The obtained uncertainty of 1–2% is an improvement by factors of five compared to previous measurements. Stellar capture cross sections were calculated for thermal energies between kT = 10 and 100 keV. These new data allow a detailed analysis of the s-process branchings at 141 Ce and 142 Pr which are determining the abundance of the s-only isotope 142 Nd. The s-process abundance pattern of the six isotopes is in perfect agreement with isotopic anomalies found in the Murchison meteorite.
Published: 1997
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230. Stellar cross sections for s-process studies

Author: Z.Y. Bao, H. Beer, F. Käppeler, K. Wisshak, and F. Voss
Subjects: Set (abstract data type), Physics, Nuclear physics, Nuclear and High Energy Physics, Chain (algebraic topology), Isotope, Thermal, Nuclear cross section, Table (information), s-process
Abstract: An updated table of Maxwellian averaged (n,γ) cross sections including the available information until December 1996 is illustrated at the example of 153 Eu. For the isotopes along the s-process reaction chain existing data were normalized if necessary, converted to stellar cross sections, and condensed into a set of recommended values for kT = 30 keV. In a second step, these recommended values were used to establish the stellar cross sections for thermal energies between 5 and 100 keV suited for all plausible s-process scenarios.
Published: 1997
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231. The stellar (n,γ) cross section of the unstable 135Cs

Author: P. E. Koehler, S. Jaag, and F. Käppeler
Subjects: Physics, Nuclear and High Energy Physics, Near threshold, Ion implantation, Isotope, Thermal, Neutron, Irradiation, Atomic physics, Activation method
Abstract: The (n,γ) cross sections of the unstable isotope 135 Cs has been measured relative to that of gold by means of the activation method. The sample was produced by ion implantation in a high resolution mass separator and irradiated in a quasi-stellar neutron spectrum for kT = 25 keV using the 7 Li(p,n) 7 Be reaction near threshold. The ∼ 8 % uncertainty of the resulting stellar cross sections is dominated by the thermal (n,γ) cross section used for sample definition.
Published: 1997
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232. Laboratory studies of heavy element formation

Author: F. Käppeler
Subjects: Physics, Nuclear and High Energy Physics, Data needs, Extrapolation, Biochemical engineering, Nuclear drip line, Heavy element, Iron peak, Nuclear theory
Abstract: With the improvement of stellar models, the scenarios for the various processes of element formation beyond the iron peak could be localized and characterized with increasing confidence. While many questions concerning the origin of the heavy elements have been answered, new problems emerged and represent a continuing challenge. Their solution depends to a large extent on the quality of the underlying nuclear physics data. New facilities and more sophisticated techniques allow to reduce the uncertainties and to push the experimental limits towards more exotic nuclei, thus assisting the theoretical extrapolation to the drip lines. The current experimental efforts and further data needs are discussed for the various processes with emphasis on the interaction between models, experiments and nuclear theory.
Published: 1997
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233. Survival of 180Ta at s-process temperatures

Author: H. Schölermann, R. Böttger, F. Käppeler, and M. Schumann
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Nuclear Theory, Intermediate state, Coulomb excitation, Atomic physics, Nuclear Experiment, s-process, Mechanism (sociology)
Abstract: The photodeexcitation of 180 Ta m was studied by means of the Coulomb excitation mechanism using protons and α-particles as projectiles. No evidence for an intermediate state below 1 MeV, as recently reported, was found, thus, infering an s-process origin of 180 Ta.
Published: 1997
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234. (p,γ)rates of92Mo,94Mo,95Mo,98Mo: Towards an experimentally founded database forp-process studies

Author: T. Sauter and F. Käppeler
Subjects: Physics, Nuclear and High Energy Physics, Range (particle radiation), Proton, Isotope, Analytical chemistry, chemistry.chemical_element, p-process, law.invention, chemistry, law, Molybdenum, Van de Graaff generator, Production (computer science), p-Nuclei
Abstract: The proton capture cross sections of the stable molybdenum isotopes 92, 94, 95, and 98 have been measured by means of the activation method in the proton energy range between 1.5 and 3 MeV. Thin layers of natural molybdenum were irradiated at the Karlsruhe 3.75 MV Van de Graaff accelerator with proton beams of 20{endash}55{mu}A. The activity induced by (p,{gamma}) reactions was measured with a calibrated HPGe detector. In this way, six cross sections for populating ground states and isomers in four different Tc isotopes could be determined simultaneously. The systematic uncertainties of this method are typically 4{percent}. The fact that the resulting cross sections are 2{endash}4 times larger than recent statistical model predictions illustrates the need of experimental data for the yet unexplored field of (p,{gamma}) reactions in the mass region beyond A=90. The present results are important for a quantitative discussion of the production of the abundant p nuclei {sup 92}Mo, {sup 94}Mo, {sup 96}Ru, and {sup 98}Ru during SNIa explosions. They represent also a first step in establishing parameter systematics that allow for more reliable model extrapolations into the region of unstable nuclei of relevance for the p process in SNII. {copyright} {ital 1997} {ital The Americanmore » Physical Society}« less
Published: 1997
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235. THE Am-243 NEUTRON CAPTURE MEASUREMENT AT THE n_TOF FACILITY

Author: F. Gramegna, N. Colonna, Marco T. Pigni, A. Pavlik, G. Vannini, K. Fujii, L. Tavora, M. Rosetti, Fabio Belloni, A. Plukis, L. Perrot, I. Savvidis, F. Käppeler, P. Rullhusen, S. David, Manuel Lozano, D. Cano-Ott, C. Eleftheriadis, V. Chepel, F. Voss, G. Tagliente, A. Ventura, G. Rudolf, M. Dahlfors, F. Becvar, E. Mendoza, A. Lindote, F. Calviño, Thomas Rauscher, E. Jericha, P. Vaz, H. Leeb, I. Duran, G. Cortes, P. Baumann, C. Domingo Pardo, A. Herrera-Martinez, P. Cennini, Isabel Lopes, D. Karadimos, L. Marques, Aaron Couture, J. Salgado, R. Vlastou, A. Poch, E. Berthoumieux, J. Marganiec, E. González-Romero, L. Sarchiapone, Vasilis Vlachoudis, C. Pretel, A. Mengoni, A. Ferrari, K. Wisshak, M. Meaze, Roberto Capote, P.A. Assimakopoulos, R. C. Haight, A. Goverdovski, M. Mosconi, Costas G. Papadopoulos, B. Haas, V. Ketlerov, C. Paradela, L. Audouin, S. O'Brien, F. Alvarez-Velarde, L. Ferrant, D. Karamanis, N. Patronis, M. Oshima, Matthias Heil, J. Pancin, R. Terlizzi, J. Andrzejewski, Michael Wiescher, W.I. Furman, H. Wendler, S. Isaev, Masayuki Igashira, S. Lukic, Gerald Badurek, C. Stephan, F. Gunsing, W. Dridi, F. Neves, Y. Kadi, Rene Reifarth, H. Frais-Koelbl, Cristian Massimi, P. M. Milazzo, V. Konovalov, I. Dillman, J. M. Quesada, L. Tassan-Got, R. Dolfini, Marco Calviani, C. A. Papachristodoulou, D. Villamarin, A. Carrillo de Albornoz, E. Griesmayer, Carlos Guerrero, U. Abbondanno, Heinz Oberhummer, P. Pavlopoulos, S. Walter, P. E. Koehler, Ralf Plag, A. García-Rios, C. Rubbia, G. Aerts, Isabel S. Gonçalves, S. Marrone, M. Kerveno, Corrie S. Moreau, A. J. M. Plompen, James L. Cox, M. Krtička, R. Ferreira-Marques, T. Martinez, H. Álvarez, J. L. Tain, E. Kossionides, Javier Praena, S. Andriamonje, E. Chiaveri, P. F. Mastinu, and C. Lampoudis
Subjects: Nuclear physics, Neutron capture, Materials science
Published: 2013
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236. Neutron capture on the s-process branch point nucleus 63 Ni

Author: C. Lederer, Marian Jandel, M. Krtička, J. L. Ullmann, John M. O'Donnell, Aaron Couture, Todd Bredeweg, Gunther Korschinek, Anton Wallner, Mario Weigand, Rene Reifarth, and F. Käppeler
Subjects: Nuclear physics, Physics, Neutron capture, medicine.anatomical_structure, medicine, Point (geometry), s-process, Nucleus
Published: 2013
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237. Neutron capture resonances inSn116,Sn118, andSn120

Author: F. Käppeler, K. Wisshak, and F. Voss
Subjects: Nuclear reaction, Nuclear physics, Physics, Nuclear and High Energy Physics, Neutron capture, Excited state, Isotopes of tin, Resonance, Elementary particle, Neutron, Atomic physics, s-process
Abstract: The neutron capture cross sections of {sup 116}Sn, {sup 118}Sn, and {sup 120}Sn, which were determined recently with the Karlsruhe 4{pi} BaF{sub 2} detector, have been reanalyzed at low energies. Resonance parameters were extracted by means of a shape analysis program, thus allowing a more reliable determination of the averaged cross sections below 20 keV. This study confirms the previously reported stellar cross sections. Accordingly, the results of the {ital s}-process studies based on these data remain unchanged. {copyright} {ital 1996 The American Physical Society.}
Published: 1996
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238. Stellar neutron capture cross sections of the tin isotopes

Author: G. Reffo, Klaus H Guber, N. Kornilov, F. Käppeler, C. Theis, F. Voss, K. Wisshak, and L. Kazakov
Subjects: Physics, Nuclear and High Energy Physics, Barium fluoride, chemistry.chemical_element, law.invention, Neutron capture, chemistry.chemical_compound, chemistry, law, Isotopes of tin, Van de Graaff generator, r-process, Neutron, Atomic physics, Tin, s-process
Abstract: The neutron capture cross sections of {sup 114}Sn, {sup 115}Sn, {sup 116}Sn, {sup 117}Sn, {sup 118}Sn, and {sup 120}Sn were measured in the energy range from 3 to 225 keV at the Karlsruhe 3.75 MV Van de Graaff accelerator. Neutrons were produced via the {sup 7}Li({ital p},{ital n}){sup 7}Be reaction using a pulsed proton beam. Capture events were registered with the Karlsruhe 4{pi} barium fluoride detector. The experiment was complicated by the small ({ital n},{gamma}) cross sections of the proton magic tin isotopes and by the comparably low enrichment of the rare isotopes {sup 114}Sn and {sup 115}Sn. Despite significant corrections for capture of scattered neutrons and for isotopic impurities, the high efficiency and the spectroscopic quality of the BaF{sub 2} detector allowed the determination of the cross-section ratios with overall uncertainties of 1{endash}2{percent}, five times smaller compared to existing data. Based on these results, Maxwellian averaged ({ital n},{gamma}) cross sections were calculated for thermal energies between {ital kT}=10 and 100 keV. These data are used for a discussion of the solar tin abundance and for an improved determination of the isotopic {ital s}- and {ital r}-process components. {copyright} {ital 1996 The American Physical Society.}
Published: 1996
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239. Moxon-Rae setup for the measurement of stellar (n,γ) rates and the example ofRb87

Author: S. Jaag and F. Käppeler
Subjects: Physics, Nuclear and High Energy Physics, Photon, Nucleosynthesis, Radiative capture, Resonance, Neutron, Atomic physics
Abstract: A setup with Moxon-Rae detectors was optimized for measurements of ({ital n},{gamma}) cross sections in the keV region. The experimental technique makes use of the quasi-Maxwellian spectrum that can be obtained via the {sup 7}Li({ital p},{ital n}){sup 7}Be reaction and is particularly suited for the determination of Maxwellian-averaged cross sections for nucleosynthesis studies related to {ital s}-process scenarios. It allows measurements at extremely short flight paths with the time-of-flight method as an option for background reduction. The experimental determination of the efficiency with calibrated {gamma} sources and with two-step cascades from selected resonances of the {sup 34}S({ital p},{gamma}) reaction revealed new properties of the response function. The reliability of the method was first demonstrated at the example of the well-known ratio of the ({ital n},{gamma}) cross sections of Ta and Au, and then used for a measurement of the stellar {sup 87}Rb cross section. With this new value {l_angle}{sigma}{ital v}{r_angle}/{ital v}{sub {ital T}}=15.5{plus_minus}1.5 mb, a discrepancy in the previously existing data could be resolved. {copyright} {ital 1996 The American Physical Society.}
Published: 1996
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240. Neutron capture cross section ofN15at stellar energies

Author: Hendrik Schatz, H. Herndl, F. Käppeler, J. Meissner, H. Beer, and Michael Wiescher
Subjects: Big Bang, Physics, Nuclear and High Energy Physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear physics, Neutron capture, Big Bang nucleosynthesis, Nucleosynthesis, Neutron cross section, Neutron, Atomic physics, Nuclear Experiment, s-process, Neutron activation
Abstract: The neutron capture rate on $^{15}\mathrm{N}$ may be of considerable importance for s-process nucleosynthesis in red giants as well as for the nucleosynthesis in inhomogeneous big bang scenarios. We measured the reaction cross section of $^{15}\mathrm{N}$(n,\ensuremath{\gamma}${)}^{16}$N at the Forschungszentrum Karlsruhe with a fast cyclic neutron activation technique at laboratory neutron energies of 25, 152, and 370 keV. Direct capture and shell model calculations were performed to interpret the results. The presented reaction rate is 30--50 % smaller than the previously used theoretical rates. \textcopyright{} 1996 The American Physical Society.
Published: 1996
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241. Neutron capture cross section ofO18and its astrophysical implications

Author: H. Herndl, Hendrik Schatz, F. Käppeler, H. Beer, Joachim Görres, Michael Wiescher, and J. Meissner
Subjects: Physics, Nuclear and High Energy Physics, Red giant, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Stars, Neutron capture, Big Bang nucleosynthesis, Nucleosynthesis, Neutron cross section, Astrophysics::Solar and Stellar Astrophysics, Neutron, Nuclear Experiment, Astrophysics::Galaxy Astrophysics, Neutron activation
Abstract: The neutron capture rate on $^{18}\mathrm{O}$ is of considerable interest in the interpretation of nucleosynthesis in inhomogeneous big bang scenarios and for stellar helium burning in massive red giant stars as well as AGB stars. We measured the reaction cross section of $^{18}\mathrm{O}$(n,\ensuremath{\gamma}${)}^{19}$O at the Forschungszentrum Karlsruhe with a fast cyclic neutron activation technique at laboratory neutron energies of 25, 129, 152, 250, and 370 keV. Direct capture and shell model calculations were performed to interpret the results as well as previous unpublished data. Contributions to the reaction cross section and to the new stellar reaction rate will be discussed. \textcopyright{} 1996 The American Physical Society.
Published: 1996
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242. Neutron capture cross sections of 69Ga and 71Ga at 25 keV and Epeak = 90 keV

Author: F. Käppeler, Kerstin Sonnabend, Ralf Plag, M. Fonseca, Kathrin Göbel, Claudia Lederer-Woods, A. Krása, M. Heftrich, Rene Reifarth, Stefan Schmidt, S. Fiebiger, P. Erbacher, Mario Weigand, Tanja Heftrich, Arjan Plompen, C. Beinrucker, LIBPhys-UNL, and DF – Departamento de Física
Subjects: Physics, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, QC1-999, Astrophysics::High Energy Astrophysical Phenomena, Activation technique, chemistry.chemical_element, Germanium, Physics and Astronomy(all), 01 natural sciences, law.invention, Joint research, Nuclear physics, Neutron capture, chemistry, law, 0103 physical sciences, Van de Graaff generator, Neutron, Atomic physics, Nuclear Experiment, 010303 astronomy & astrophysics
Abstract: This project was supported by EFNUDAT, ERINDA, the EuroGENESIS project MASCHE, HIC for FAIR and BMBF (05P15RFFN1). We measured the neutron capture cross sections of 69Ga and 71Ga for a quasi-stellar spectrum at kBT = 25 keV and a spectrum with a peak energy at 90 keV by the activation technique at the Joint Research Centre (JRC) in Geel, Belgium. Protons were provided by an electrostatic Van de Graaff accelerator to produce neutrons via the reaction 7Li(p,n). The produced activity was measured via the γ emission of the product nuclei by high-purity germanium detectors. We present preliminary results. publishersversion published
Published: 2017
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243. The93Zr(n,γ) reaction up to 8 keV neutron energy

Author: L. Perrot, M. Dahlfors, E. Jericha, P. Vaz, Aaron Couture, S. Walter, A. Herrera-Martinez, N. Patronis, Ralf Plag, H. Álvarez, S. David, C. Lamboudis, J. L. Tain, W.I. Furman, Arnaud Ferrari, L. Tavora, C. A. Papachristodoulou, M. Rosetti, G. Tagliente, D. Karamanis, I. Dillmann, Carlos Guerrero, U. Abbondanno, Heinz Oberhummer, K. Wisshak, E. Kossionides, A. Ventura, F. Käppeler, Corrie S. Moreau, C. Eleftheriadis, Javier Praena, M. Kerveno, J. Andrzejewski, G. Vannini, Marco Calviani, B. Haas, V. Chepel, G. Rudolf, P. Rullhusen, A. Plukis, J. Salgado, G. Aerts, A. Poch, C. Santos, D. Karadimos, F. Neves, P. M. Milazzo, P. Baumann, C. Carrapiço, D. Villamarin, F. Gunsing, E. González-Romero, A. Pavlik, A. Mengoni, C. Pretel, W. Dridi, M. Krtička, F. Calviño, Rene Reifarth, Cristian Massimi, F. Bečvář, C. Domingo-Pardo, L. Sarchiapone, R. Ferreira-Marques, T. Martinez, A. J. M. Plompen, J. M. Quesada, F. Voss, P. Cennini, Marco T. Pigni, Matthias Heil, I. Duran, J. Marganiec, S. Andriamonje, L. Tassan-Got, G. Cortes, P. Pavlopoulos, E. Chiaveri, M. Embid-Segura, F. Alvarez-Velarde, H. Leeb, I. Savvidis, M. Mosconi, P. F. Mastinu, Y. Kadi, S. O'Brien, Gerald Badurek, R. C. Haight, D. Cano-Ott, R. Terlizzi, Roberto Capote, C. Paradela, L. Audouin, Nicola Colonna, K. Fujii, Vasilis Vlachoudis, R. Vlastou, E. Berthoumieux, Fabio Belloni, M. C. Vincente, Christoph A. Stephan, S. Lukic, A. Lindote, F. Gramegna, Isabel Lopes, Michael Wiescher, C. T. Papadopoulos, C. Rubbia, Isabel S. Gonçalves, and S. Marrone
Subjects: Physics, Nuclear and High Energy Physics, Radionuclide, Range (particle radiation), Nuclear transmutation, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Resonance, 7. Clean energy, 01 natural sciences, Neutron temperature, Nuclear physics, Time of flight, 13. Climate action, Nucleosynthesis, 0103 physical sciences, Physics::Accelerator Physics, Atomic physics, Nuclear Experiment, s-process, 010303 astronomy & astrophysics
Abstract: The (n,γ) reaction of the radioactive isotope 93Zr has been measured at the n-TOF high-resolution time-of-flight facility at CERN. Resonance parameters have been extracted in the neutron energy range up to 8 keV, yielding capture widths smaller (14%) than reported in an earlier experiment. These results are important for detailed nucleosynthesis calculations and for refined studies of waste transmutation concepts. © 2013 American Physical Society.
Published: 2013
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244. Neutron Capture Cross Section of UnstableNi63: Implications for Stellar Nucleosynthesis

Author: M. A. Cortés-Giraldo, K. Fraval, F. Bečvář, T. Wright, R. Losito, J. Marganiec, W. Mondelaers, P. M. Milazzo, D. G. Jenkins, L. Audouin, M. Meaze, N. Dzysiuk, M. J. Vermeulen, F. Käppeler, G. Tagliente, P. F. Mastinu, M. P. W. Chin, H. Leeb, V. Variale, Marco Pignatari, S. Valenta, G. Vannini, M. Mastromarco, Marco Calviani, Alfredo Ferrari, Roberto Versaci, C. Paradela, J. Perkowski, I. Duran, E. Chiaveri, D. Cano-Ott, C. Lederer, E. Berthoumieux, F. Roman, A. Manousos, F. Cerutti, F. Mingrone, J. Andrzejewski, F. Gunsing, Carlo Rubbia, C. Carrapiço, A. Pavlik, M. Krtička, F. Calviño, S. Altstadt, E. Jericha, E. Mendoza, C. Domingo-Pardo, R. Dressler, J. Billowes, Anton Wallner, M. Weigand, T. Martinez, Alberto Mengoni, Srinivasan Ganesan, M. B. Gómez-Hornillos, Christoph Langer, C. Weiß, Cristian Massimi, F. Belloni, Petar Žugec, M. Kokkoris, N. Kivel, C. Eleftheriadis, M. Mirea, G. Cortes, D. Tarrío, M. Diakaki, J. L. Tain, P. E. Koehler, A. Tsinganis, Mario Barbagallo, D. Schumann, P. Gurusamy, Thomas Rauscher, Rene Reifarth, P. Vaz, Nicola Colonna, L.S. Leong, Alberto Ventura, Javier Praena, A. Riego, Jeri Kroll, T. Ware, Vasilis Vlachoudis, I. F. Gonçalves, E. Griesmayer, Vittorio Boccone, J. M. Quesada, R. Sarmento, S. Schmidt, A. J. M. Plompen, L. Tassan-Got, Carlos Guerrero, D. Karadimos, Gunther Korschinek, P. Schillebeeckx, E. González-Romero, A. R. García, G. Giubrone, M. Brugger, R. Vlastou, Damir Bosnar, Y. Kadi, and V. Bécares
Subjects: Physics, 010308 nuclear & particles physics, Radiative capture, General Physics and Astronomy, Library science, Astrophysics, 7. Clean energy, 01 natural sciences, Stellar nucleosynthesis, 13. Climate action, 0103 physical sciences, Technical university, Nuclear astrophysics, Neutron cross section, 010303 astronomy & astrophysics
Abstract: The authors would like to thank H. Danninger and C. Gierl of the Technical University of Vienna for their help preparing the 62Ni sample. This work was partly supported by the Austrian Science Fund (FWF), Projects No. P20434 and No. I428. M. P. also acknowledges the support from the Ambizione grant of the Swiss NSF, the NSF Grants No. PHY 02-16783 and No. PHY 09-22648 (Joint Institute for Nuclear Astrophysics, JINA), EU Grant No. MIRG-CT-2006-046520, and EuroGenesis. T. R. acknowledges support from EuroGenesis, the FP7 ENSAR/THEXO project, and a "Distinguished Guest Scientist Fellowship" from the Hungarian Academy of Sciences.
Published: 2013
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245. Performance of the neutron time-of-flight facility n_TOF at CERN

Author: F. Bečvář, M. Mirea, Yacine Kadi, P. Vaz, L. Audouin, M. B. Gómez-Hornillos, Carlos Guerrero, M. P. W. Chin, Alberto Ventura, Peter Schillebeeckx, N. Dzysiuk, Kathrin Göbel, Petar Žugec, H. Leeb, A. Manousos, F. Roman, Alfredo Ferrari, P. M. Milazzo, J. Perkowski, E. Chiaveri, C. Lampoudis, Srinivasan Ganesan, M. A. Cortés-Giraldo, D. Cano-Ott, A. J. M. Plompen, S. Altstadt, G. Giubrone, R. Versaci, J. Billowes, Mario Weigand, G. Tagliente, A. Pavlik, C. Domingo-Pardo, Fabio Belloni, A. Hernández-Prieto, A. R. García, M. Sabaté-Gilarte, F. Mingrone, J. Andrzejewski, V. Bécares, Mario Barbagallo, E. Jericha, M. Kokkoris, F. Gunsing, T. J. Wright, Rugard Dressler, M. Brugger, Dorothea Schumann, Carlo Rubbia, J. L. Tain, C. Langer, V. Vlachoudis, M. Meaze, Rene Reifarth, Jeri Kroll, M. Diakaki, Cristian Massimi, V. Boccone, Patrick Steinegger, W. Mondalaers, Stefan Schmidt, E. Mendoza, R. Sarmento, J. M. Quesada, E. Berthoumieux, Javier Praena, E. Leal-Cidoncha, A. Tsinganis, D. G. Jenkins, Laurent Tassan-Got, C. Eleftheriadis, I. Goncalves, T. Papaevangelou, Thomas Rauscher, M. Mastromarco, Nicola Colonna, L.S. Leong, C. Carrapiço, Anton Wallner, P. E. Koehler, D. Karadimos, C. Paradela, A. K. Saxena, M. J. Vermeulen, Roberto Losito, F. Cerutti, S. Valenta, I. Duran, Alberto Mengoni, Marco Calviani, C. Weiß, R. Vlastou, T. Ware, Damir Bosnar, E. Griesmayer, V. Variale, A. Riego, C. Lederer, F. Käppeler, N. Kivel, P. Gurusamy, G. Vannini, G. Cortes, D. Tarrío, T. Martinez, E. Gonzalez-Romero, K. Fraval, J. Marganiec, S. Andriamonje, P. F. Mastinu, M. Krtička, F. Calviño, Ventura, A., Mengoni, A., Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, nTOF, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Guerrero C., Tsinganis A., Berthoumieux E., Barbagallo M., Belloni F., Gunsing F., Weiss C., Chiaveri E., Calviani M., Vlachoudis V., Altstadt S., Andriamonje S., Andrzejewski J., Audouin L., Bécares V., Becvar F., Billowes J., Boccone V., Bosnar D., Brugger M., Calvino F., Cano-Ott D., Carrapico C., Cerutti F., Chin M., Colonna N., Cortès G., Cortes-Giraldo M.A., Diakaki M., Domingo-Pardo C., Duran I., Dressler R., Dzysiuk N., Eleftheriadis C., Ferrari A., Fraval K., Ganesan S., Garcia A.R., Giubrone G., Gobel K., Gomez-Hornillos M.B., Gonzalves I.F., Gonzalez-Romero E., Griesmayer E., Gurusamy P., Hernandez-Prieto A., Jenkins D.G., Jericha E., Kadi Y., Kappeler F., Karadimos D., Kivel N., Koehler P., Kokkoris M., Krtika M., Kroll J., Lampoudis C., Langer C., Leal-Cidoncha E., Lederer C., Leeb H., Leong L.S., Losito R., Manousos A., Marganiec J., Martinez T., Massimi C., Mastinu P.F., Mastromarco M., Meaze M., Mendoza E., Mengoni A., Milazzo P.M., Mingrone F., Mirea M., Mondalaers W., Papaevangelou T., Paradela C., Pavlik A., Perkowski J., Plompen A., Praena J., Quesada J.M., Rauscher T., Reifarth R., Riego A., Roman F., Rubbia C., Sabate-Gilarte M., Sarmento R., Saxena A., Schillebeeckx P., Schmidt S., Schumann D., Steinegger P., Tagliente G., Tain J.L., Tarrio D., Tassan-Got L., Valenta S., Vannini G., Variale V., Vaz P., Ventura A., Versaci R., Vermeulen M.J., Vlastou R., Wallner A., Ware T., Weigand M., Wright T., and Zugec P.
Subjects: Nuclear and High Energy Physics, Astrophysics::High Energy Astrophysical Phenomena, Física::Física de partícules [Àrees temàtiques de la UPC], Neutron scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Neutron time-of-flight scattering, MEASUREMENT, PERFORMANCE REPORT, Nuclear physics, Neutron flux, 0103 physical sciences, Neutron cross section, Neutron detection, Neutron, 010306 general physics, Nuclear Experiment, Physics, Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, NEUTRON CROSS SECTION, 010308 nuclear & particles physics, Neutron temperature, n_TOF facility, Neutron source, Physics::Accelerator Physics, TIME OF FLIGHT
Abstract: The neutron time-of-flight facility n TOF features a white neutron source produced by spallation through 20 GeV/c protons impinging on a lead target. The facility, aiming primarily at the measurement of neutron-induced reaction cross sections, was operating at CERN between 2001 and 2004, and then underwent a major upgrade in 2008. This paper presents in detail all the characteristics of the new neutron beam in the currently available configurations, which correspond to two different collimation systems and two choices of neutron moderator. The characteristics discussed include the intensity and energy dependence of the neutron flux, the spatial profile of the beam, the in-beam background components and the energy resolution/broadening. The discussion of these features is based on dedicated measurements and Monte Carlo simulations, and includes estimations of the systematic uncertainties of the mentioned quantities.
Published: 2013
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246. 238U(n, gamma) reaction cross section measurement with C6D6 detectors at the n_TOF CERN facility

Author: G. Cortes, D. Tarrío, C. Lederer, F. Bečvář, F. Käppeler, E. Mendoza, I. Duran, F. Cerutti, Peter Schillebeeckx, F. Mingrone, C. Lampoudis, Y. Kadi, J. Andrzejewski, T. Ware, V. Bécares, E. Griesmayer, A. Riego, A. Mallick, G. Vannini, A. K. Saxena, G. Tagliente, Javier Praena, P. M. Milazzo, Arnaud Ferrari, V. Variale, Jeri Kroll, M. P. W. Chin, M. S. Robles, M. J. Vermeulen, J. Billowes, P. E. Koehler, E. Jericha, I. F. Gonçalves, P. Vaz, Sebastian Schmidt, S. Altstadt, D. Cano-Ott, Dorothea Schumann, C. Weiß, S. Valenta, M. Diakaki, R. Sarmento, Marco Calviani, Fabio Belloni, R. Vlastou, A. Manousos, E. Berthoumieux, J. Marganiec, A. R. García, D. Bosnar, M. Brugger, G. Giubrone, A. J. M. Plompen, Carlos Guerrero, E. Leal-Cidoncha, C. Eleftheriadis, Thomas Rauscher, D. Karadimos, T. J. Wright, E. González-Romero, Christoph Langer, Petar Žugec, A. Pavlik, C. Domingo-Pardo, M. Sabaté-Gilarte, C. Paradela, L. Audouin, W. Mondalaers, Pierfrancesco Mastinu, D. G. Jenkins, Roberto Losito, M. A. Cortés-Giraldo, Srinivasan Ganesan, Rugard Dressler, A. Tsinganis, Nicola Colonna, L.S. Leong, Vasilis Vlachoudis, Mario Barbagallo, C. Rubbia, J. L. Tain, Niko Kivel, K. Fraval, Alberto Mengoni, E. Chiaveri, M. Mirea, H. Leeb, J. Perkowski, F. Gunsing, Cristian Massimi, M. Krtička, F. Calviño, Mario Weigand, A. Ventura, T. Martinez, Rene Reifarth, J. M. Quesada, L. Tassan-Got, A. Hernández-Prieto, M. Mastromarco, C. Carrapiço, Anton Wallner, Ventura, A., Mengoni, A., 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, INPC 2013 – International Nuclear Physics Conference, Lunardi, S., Mingrone, F., Massimi, C., Vannini, G., Altstadt, S., Andrzejewski, J., Audouin, L., Barbagallo, M., Bécares, V., Bečvář, F., Belloni, F., Berthoumieux, E., Billowes, J., Bosnar, D., Brugger, M., Calviani, M., Calviño, F., Cano-Ott, D., Carrapiço, C., Cerutti, F., Chiaveri, E., Chin, M., Colonna, N., Cortés, G., Cortés-Giraldo, M.A., Diakaki, M., Domingo-Pardo, C., Duran, I., Dressler, R., Eleftheriadis, C., Ferrari, A., Fraval, K., Ganesan, S., García, A.R., Giubrone, G., Gonçalves, I.F., González-Romero, E., Griesmayer, E., Guerrero, C., Gunsing, F., Hernández-Prieto, A., Jenkins, D.G., Jericha, E., Kadi, Y., Käppeler, F., Karadimos, D., Kivel, N., Koehler, P., Krtička, M., Kroll, J., Lampoudis, C., Langer, C., Leal-Cidoncha, E., Lederer, C., Leeb, H., Leong, L.S., Losito, R., Mallick, A., Manousos, A., Marganiec, J., Martínez, T., Mastinu, P.F., Mastromarco, M., Mendoza, E., Milazzo, P.M., Mirea, M., Mondalaers, W., Paradela, C., Pavlik, A., Perkowski, J., Plompen, A., Praena, J., Quesada, J.M., Rauscher, T., Reifarth, R., Riego, A., Robles, M.S., Rubbia, C., Sabaté-Gilarte, M., Sarmento, R., Saxena, A., Schillebeeckx, P., Schmidt, S., Schumann, D., Tagliente, G., Tain, J.L., Tarrío, D., Tassan-Got, L., Tsinganis, A., Valenta, S., Variale, V., Vaz, P., Vermeulen, M.J., Vlachoudis, V., Vlastou, R., Wallner, A., Ware, T., Weigand, M., Weiß, C., Wright, T., and Žugec, P.
Subjects: Physics, Nuclear reaction, Energies::Energia nuclear [Àrees temàtiques de la UPC], Scintillation, Background subtraction, 010308 nuclear & particles physics, QC1-999, 238U, neutron capture, n_TOF, Nuclear energy, 01 natural sciences, Engineering physics, Particle detector, Nuclear physics, Physics and Astronomy (all), Cross section (physics), 0103 physical sciences, Scintillation counter, Measuring instrument, Energia nuclear, ddc:530, 010306 general physics, Data reduction
Abstract: The radiative capture cross section of 238U is very important for the developing of new reactor technologies and the safety of existing ones. Here the preliminary results of the 238U(n,γ) cross section measurement performed at n-TOF with C6D6 scintillation detectors are presented, paying particular attention to data reduction and background subtraction. © Owned by the authors, published by EDP Sciences, 2014.
Published: 2013

247. CEMP-s and CEMP-s/r stars: last update

Author: F. Käppeler, Oscar Straniero, R. Gallino, Sergio Cristallo, Sara Bisterzo, and Michael Wiescher
Subjects: Physics, Stars, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, Nucleosynthesis, General Engineering, Asymptotic giant branch, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Solar and Stellar Astrophysics (astro-ph.SR)
Abstract: We provide an updated discussion of the sample of CEMP-s and CEMP-s/r stars collected from the literature. Observations are compared with the theoretical nucleosynthesis models of asymptotic giant branch (AGB) stars presented by Bisterzo et al. (2010, 2011, 2012), in the light of the most recent spectroscopic results., Comment: 10 pages, 2 figures, New advances in stellar physics: from microscopic to macroscopic processes, May 27-31 2013, Roscoff, France, EDP Science, EAS Publications Series, in press
Published: 2013
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248. PINO - a tool for simulating neutron spectra resulting from the 7Li(p,n) reaction

Author: Matthias Heil, Rene Reifarth, F. Käppeler, and Ralf Plag
Subjects: Physics, Nuclear and High Energy Physics, Proton, Monte Carlo method, Nuclear Theory, Phase (waves), The Renaissance, FOS: Physical sciences, Neutron spectra, law.invention, Nuclear physics, law, Van de Graaff generator, Neutron, Nuclear Experiment (nucl-ex), Nuclear Experiment, Instrumentation
Abstract: The 7Li(p,n) reaction in combination with a 3.7 MV Van de Graaff accelerator was routinely used at FZK to perform activation as well as time-of-flight measurements with neutrons in the keV-region. Planned new setups with much higher proton currents like SARAF and FRANZ and the availability of liquid-lithium target technology will trigger a renaissance of this method. A detailed understanding of the neutron spectrum is not only important during the planning phase of an experiment, but also for the analysis of activation experiments. Therefore, the Monte-Carlo based program PINO (Protons In Neutrons Out) was developed, which allows the simulation of neutron spectra considering the geometry of the setup and the proton-energy distribution.
Published: 2013
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249. High-accuracy determination of the neutron flux at n TOF

Author: G. Vannini, A. R. García, M. Brugger, E. Leal-Cidoncha, C. Eleftheriadis, Thomas Rauscher, M. B. Gómez-Hornillos, Christoph Langer, D. Karadimos, M. P. W. Chin, E. González-Romero, Rene Reifarth, F. Cerutti, Petar Žugec, F. Roman, Stefan Schmidt, W. Mondalaers, S. Andriamonje, Kathrin Göbel, J. M. Quesada, R. Versaci, L. Tassan-Got, G. Cortes, E. Jericha, A. Manousos, D. Tarrío, Srinivasan Ganesan, M. Kokkoris, P. F. Mastinu, C. Paradela, Patrick Steinegger, S. Valenta, Marco Calviani, G. Giubrone, M. Meaze, E. Chiaveri, D. Cano-Ott, Dorothea Schumann, Carlos Guerrero, J. Marganiec, T. Martinez, E. Mendoza, E. Berthoumieux, Roberto Losito, M. Mastromarco, M. Mirea, D. G. Jenkins, Javier Praena, A. Hernández-Prieto, L. Audouin, V. Bécares, C. Lampoudis, A. Pavlik, C. Domingo-Pardo, Mario Barbagallo, C. Carrapiço, Anton Wallner, G. Tagliente, A. J. M. Plompen, A. K. Saxena, M. Sabaté-Gilarte, Rugard Dressler, T. Ware, F. Mingrone, J. Andrzejewski, Alberto Mengoni, T. Papaevangelou, J. Billowes, Carlo Rubbia, M. A. Cortés-Giraldo, A. Tsinganis, V. Vlachoudis, J. L. Tain, V. Boccone, R. Vlastou, Nicola Colonna, L.S. Leong, V. Variale, Yacine Kadi, T. J. Wright, Damir Bosnar, P. Vaz, H. Leeb, P. M. Milazzo, J. Perkowski, Alberto Ventura, E. Griesmayer, Alfredo Ferrari, F. Gunsing, M. Krtička, F. Calviño, Jeri Kroll, R. Sarmento, Cristian Massimi, S. Altstadt, M. Diakaki, F. Bečvář, Peter Schillebeeckx, N. Dzysiuk, M. J. Vermeulen, Mario Weigand, P. E. Koehler, I. Duran, C. Weiß, F. Käppeler, K. Fraval, N. Kivel, P. Gurusamy, C. Lederer, A. Riego, I. F. Gonçalves, Fabio Belloni, M. Barbagallo, C. Guerrero, A. Tsingani, D. Tarrio, S. Altstadt, S. Andriamonje, J. Andrzejewski, L. Audouin, V. Becare, F. Becvar, F. Belloni, E. Berthoumieux, J. Billowe, V. Boccone, D. Bosnar, M. Brugger, M. Calviani, F. Calvino, D. Cano-Ott, C. Carrapico, F. Cerutti, E. Chiaveri, M. Chin, N. Colonna, G. Corte, M. A. Cortes-Giraldo, M. Diakaki, C. Domingo-Pardo, I. Duran, R. Dressler, N. Dzysiuk, C. Eleftheriadi, A. Ferrari, K. Fraval, S. Ganesan, A. R. Garcia, G. Giubrone, K. Gobel, M. B. Gomez-Hornillo, I. F. Goncalve, E. Gonzalez-Romero, E. Griesmayer, F. Gunsing, P. Gurusamy, A. Hernandez-Prieto, D. G. Jenkin, E. Jericha, Y. Kadi, F. Kappeler, D. Karadimo, N. Kivel, P. Koehler, M. Kokkori, M. Krticka, J. Kroll, C. Lampoudi, C. Langer, E. Leal-Cidoncha, C. Lederer, H. Leeb, L. S. Leong, R. Losito, A. Manouso, J. Marganiec, T. Martinez, C. Massimi, P. F. Mastinu, M. Mastromarco, M. Meaze, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, M. Mirea, W. Mondalaer, T. Papaevangelou, C. Paradela, A. Pavlik, J. Perkowski, A. Plompen, J. Praena, J. M. Quesada, T. Rauscher, R. Reifarth, A. Riego, F. Roman, C. Rubbia, M. Sabate-Gilarte, R. Sarmento, A. Saxena, P. Schillebeeckx, S. Schmidt, D. Schumann, P. Steinegger, G. Tagliente, J. L. Tain, L. Tassan-Got, S. Valenta, G. Vannini, V. Variale, P. Vaz, A. Ventura, R. Versaci, M. J. Vermeulen, V. Vlachoudi, R. Vlastou, A. Wallner, T. Ware, M. Weigand, C. Wei, T. Wright, P. Zugec, Mengoni, A., 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, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, TOF, and 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)
Subjects: Nuclear and High Energy Physics, Fission, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Flux, BEAM, neutron flux, n_TOF, Neutron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, Cross section (physics), Neutron flux, 0103 physical sciences, CERN, Nuclear fusion, High pressure physics, Spallation, FACILITY, Experimental physics, 010306 general physics, Nuclear Experiment, Physics, Neutrons, Energies::Energia nuclear [Àrees temàtiques de la UPC], Física [Àrees temàtiques de la UPC], 010308 nuclear & particles physics, SCIENCE, Neutron radiation, Ntof, 13. Climate action, STANDARDS
Abstract: The neutron flux of the n TOF facility at CERN was measured, after installation of the new spallation target, with four different systems based on three neutron-converting reactions, which represent accepted cross sections standards in different energy regions. A careful comparison and combination of the different measurements allowed us to reach an unprecedented accuracy on the energy dependence of the neutron flux in the very wide range (thermal to 1 GeV) that characterizes the n TOF neutron beam. This is a pre-requisite for the high accuracy of cross section measurements at n TOF. An unexpected anomaly in the neutron-induced fission cross section of 235U is observed in the energy region between 10 and 30 keV, hinting at a possible overestimation of this important cross section, well above currently assigned uncertainties. © Società Italiana di Fisica / Springer-Verlag 2013.
Published: 2013
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250. A new CVD diamond mosaic-detector for (n, α) cross-section measurements at the n_TOF experiment at CERN

Author: F. Bečvář, T. J. Wright, F. Cerutti, Mario Weigand, E. Gonzalez-Romero, Rene Reifarth, J. L. Tain, C. Lampoudis, C. Lederer, N. Kivel, Stefan Schmidt, M. Meaze, J. M. Quesada, F. Gunsing, J. Billowes, Jeri Kroll, P. Vaz, Srinivasan Ganesan, P. Gurusamy, K. Fraval, Cristian Massimi, Alberto Ventura, M. B. Gómez-Hornillos, E. Mendoza, C. Paradela, Javier Praena, R. Sarmento, Mario Barbagallo, E. Berthoumieux, M. S. Robles, A. Riego, M. Krtička, F. Calviño, M. A. Cortés-Giraldo, M. Mirea, G. Tagliente, Peter Schillebeeckx, N. Dzysiuk, Carlos Guerrero, A. Pavlik, T. Martinez, L. Audouin, Petar Žugec, Alfredo Ferrari, C. Domingo-Pardo, Roberto Losito, V. Variale, I. Duran, H. Leeb, M. Sabaté-Gilarte, M. Mastromarco, F. Käppeler, M. Diakaki, J. Perkowski, A. K. Saxena, P. M. Milazzo, J. Marganiec, A. Mallick, G. Vannini, Gerald Badurek, V. Boccone, S. Altstadt, A. Hernández-Prieto, A. J. M. Plompen, P. F. Mastinu, A. Manousos, C. Eleftheriadis, E. Jericha, G. Giubrone, E. Chiaveri, D. Cano-Ott, Alberto Mengoni, V. Bécares, Dorothea Schumann, Yacine Kadi, Rugard Dressler, C. Weiß, R. Versaci, P. E. Koehler, F. Mingrone, J. Andrzejewski, A. Tsinganis, G. Cortes, M. Kokkoris, D. Tarrío, Carlo Rubbia, Nicola Colonna, L.S. Leong, C. Langer, V. Vlachoudis, E. Griesmayer, T. Ware, C. Carrapiço, Anton Wallner, D. G. Jenkins, Laurent Tassan-Got, W. Mondalaers, Fabio Belloni, M. P. W. Chin, F. Roman, E. Leal-Cidoncha, I. Goncalves, Thomas Rauscher, M. J. Vermeulen, D. Karadimos, S. Valenta, A. R. García, M. Brugger, Marco Calviani, R. Vlastou, Damir Bosnar, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, TOF, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions, Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Ventura, A., Mengoni, A., C. Wei, E. Griesmayer, C. Guerrero, S. Altstadt, J. Andrzejewski, L. Audouin, G. Badurek, M. Barbagallo, V. Becare, F. Becvar, F. Belloni, E. Berthoumieux, J. Billowe, V. Boccone, D. Bosnar, M. Brugger, M. Calyiani, F. Calvino, D. Cano-Ott, C. Carrapico, F. Cerutti, E. Chiaveri, M. Chin, N. Colonna, G. Corte, M. A. Cortes-Giraldo, M. Diakaki, C. Domingo-Pardo, I. Duran, R. Dressler, N. Dzysiuk, C. Eleftheriadi, A. Ferrari, K. Fraval, S. Ganesan, A. R. Garcia, G. Giubrone, M. B. Gomez-Hornillo, I. F. Goncalve, E. Gonzalez-Romero, F. Gunsing, P. Gurusamy, A. Hernandez-Prieto, D. G. Jenkin, E. Jericha, Y. Kadi, F. Kappeler, D. Karadimo, N. Kivel, P. Koehler, M. Kokkori, M. Krticka, J. Kroll, C. Lampoudi, C. Langer, E. Leal-Cidoncha, C. Lederer, H. Leeb, L. S. Leong, R. Losito, A. Mallick, A. Manouso, J. Marganiec, T. Martinez, C. Massimi, P. F. Mastinu, M. Mastromarco, M. Meaze, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, M. Mirea, W. Mondalaer, C. Paradela, A. Pavlik, J. Perkowski, A. Plompen, J. Praena, J. M. Quesada, T. Rauscher, R. Reifarth, A. Riego, M. S. Roble, F. Roman, C. Rubbia, M. Sabate-Gilarte, R. Sarmento, A. Saxena, P. Schillebeeckx, S. Schmidt, D. Schumann, G. Tagliente, J. L. Tain, D. Tarrio, L. Tassan-Got, A. Tsingani, S. Valenta, G. Vannini, V. Variale, P. Vaz, A. Ventura, R. Versaci, M. J. Vermeulen, V. Vlachoudi, R. Vlastou, A. Wallner, T. Ware, M. Weigand, T. Wright, and P. Zugec
Subjects: Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Energies [Àrees temàtiques de la UPC], Analytical chemistry, Chemical vapor deposition, 7. Clean energy, 01 natural sciences, CVD diamond detectors, Chemical reactions, n_TOF, Detectors and Experimental Techniques, Energy resolution, Nuclear Experiment, Instrumentation, Physics, sCVD diamond detectors, (n, α) Cross-section measurements, Large Hadron Collider, ntof, Detector, Resolution (electron density), Austria, Sponsored this work, Vienna, Nuclear Detector, Enginyeria química::Química física [Àrees temàtiques de la UPC], Nuclear and High Energy Physics, Cross-section measurements, Nanotechnology, engineering.material, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Reaccions químiques, Cross section (physics), 0103 physical sciences, (n,α) Cross-section measurement, Neutron, 010306 general physics, Diode, Energies::Energia nuclear [Àrees temàtiques de la UPC], CIVIDEC Instrumentation GmbH, 010308 nuclear & particles physics, (n,α) Cross-section measurements, n-TOF, neutrons, Diamond, (n, α) cross-section measurements, engineering, High Energy Physics::Experiment, diamond detector
Abstract: At the n\_TOF experiment at CERN a dedicated single-crystal chemical vapor deposition (sCVD) Diamond Mosaic-Detector has been developed for (n,$\alpha$) cross-section measurements. The detector, characterized by an excellent time and energy resolution, consists of an array of 9 sCVD diamond diodes. The detector has been characterized and a cross-section measurement has been performed for the $^{59}$Ni(n,$\alpha$)$^{56}$Fe reaction in 2012. The characteristics of the detector, its performance and the promising preliminary results of the experiment are presented., Comment: Conference proceedings of the Vienna Conference on Instrumentation 2013
Published: 2013
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