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New measurement of neutron capture resonances in Bi209

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National Technical University of Athens   

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New measurement of neutron capture resonances in Bi209 (EN)
Calvino, F (EN)
Lamboudis, C (EN)
Rullhusen, P (EN)
Audouin, L (EN)
Wendler, H (EN)
Rubbia, C (EN)
Koehler, P (EN)
Dridi, W (EN)
Plag, R (EN)
Fujii, K (EN)
Savvidis, I (EN)
Marques, L (EN)
Cortes, G (EN)
Vlachoudis, V (EN)
Berthoumieux, E (EN)
Mastinu, P (EN)
Ferreira-Marques, R (EN)
Fitzpatrick, L (EN)
Kossionides, E (EN)
Sarchiapone, L (EN)
Tagliente, G (EN)
Cano-Ott, D (EN)
Andrzejewski, J (EN)
Domingo-Pardo, C (EN)
Becvar, F (EN)
Frais-Koelbl, H (EN)
Tavora, L (EN)
Jericha, E (EN)
Baumann, P (EN)
Rauscher, T (EN)
Tain, JL (EN)
Oshima, M (EN)
Eleftheriadis, C (EN)
Heil, M (EN)
Rosetti, M (EN)
Salgado, J (EN)
Wisshak, K (EN)
Colonna, N (EN)
Plompen, A (EN)
Terlizzi, R (EN)
Neves, F (EN)
Lopes, I (EN)
Marrone, S (EN)
Herrera-Martinez, A (EN)
Tassan-Got, L (EN)
Mosconi, M (EN)
Patronis, N (EN)
Furman, W (EN)
Lozano, M (EN)
Plukis, A (EN)
Rudolf, G (EN)
Wiescher, M (EN)
Cennini, P (EN)
Chiaveri, E (EN)
Reifarth, R (EN)
Chepel, V (EN)
Gallino, R (EN)
Mengoni, A (EN)
Vincente, MC (EN)
Ketlerov, V (EN)
Igashira, M (EN)
Griesmayer, E (EN)
Papadopoulos, C (EN)
Gunsing, F (EN)
Villamarin, D (EN)
Capote, R (EN)
Karadimos, D (EN)
Krticka, M (EN)
Pavlopoulos, P (EN)
Haight, R (EN)
Lindote, A (EN)
Walter, S (EN)
Quesada, J (EN)
Guerrero, C (EN)
Ferrant, L (EN)
Alvarez-Velarde, F (EN)
Albornoz, ACD (EN)
Goverdovski, A (EN)
Kadi, Y (EN)
Vaz, P (EN)
Kappeler, F (EN)
Ventura, A (EN)
Pretel, C (EN)
Aerts, G (EN)
Paradela, C (EN)
Haas, B (EN)
Oberhummer, H (EN)
Badurek, G (EN)
Vlastou, R (EN)
Cox, J (EN)
Gramegna, F (EN)
Pancin, J (EN)
Perrot, L (EN)
Gonzalez-Romero, E (EN)
Ferrari, A (EN)
Dolfini, R (EN)
Embid-Segura, M (EN)
Konovalov, V (EN)
Alvarez-Pol, H (EN)
Dahlfors, M (EN)
Vannini, G (EN)
Karamanis, D (EN)
Abbondanno, U (EN)
David, S (EN)
Duran, I (EN)
Pavlik, A (EN)
Dillman, I (EN)
Goncalves, I (EN)
Moreau, C (EN)
Stephan, C (EN)
Assimakopoulos, P (EN)
O'Brien, S (EN)
Couture, A (EN)
Papachristodoulou, C (EN)
Leeb, H (EN)
Kerveno, M (EN)
Voss, F (EN)
Poch, A (EN)
Andriamonje, S (EN)
Isaev, S (EN)
Marganiec, J (EN)
Lukic, S (EN)
Milazzo, PM (EN)
journalArticle (EN)
2014-03-01T01:24:43Z
2006 (EN)
The neutron capture cross section of Bi209 has been measured at the CERN n_TOF facility by employing the pulse-height-weighting technique. Improvements over previous measurements are mainly because of an optimized detection system, which led to a practically negligible neutron sensitivity. Additional experimental sources of systematic error, such as the electronic threshold in the detectors, summing of γ-rays, internal electron conversion, and the isomeric state in bismuth, have been taken into account. γ-Ray absorption effects inside the sample have been corrected by employing a nonpolynomial weighting function. Because Bi209 is the last stable isotope in the reaction path of the stellar s-process, the Maxwellian averaged capture cross section is important for the recycling of the reaction flow by α decays. In the relevant stellar range of thermal energies between kT=5 and 8 keV our new capture rate is about 16% higher than the presently accepted value used for nucleosynthesis calculations. At this low temperature an important part of the heavy Pb-Bi isotopes are supposed to be synthesized by the s-process in the He shells of low mass, thermally pulsing asymptotic giant branch stars. With the improved set of cross sections we obtain an s-process fraction of 19±3% of the solar bismuth abundance, resulting in an r-process residual of 81±3%. The present (n,γ) cross-section measurement is also of relevance for the design of accelerator driven systems based on a liquid metal Pb/Bi spallation target. © 2006 The American Physical Society. (EN)
Physics, Nuclear (EN)
SYSTEM (EN)
ELEMENTS (EN)
FACILITY (EN)
DETECTOR (EN)
S-PROCESS (EN)
CHRONOMETERS (EN)
STARS (EN)
CROSS-SECTION (EN)
ABUNDANCES (EN)
GALACTIC CHEMICAL EVOLUTION (EN)
Physical Review C - Nuclear Physics (EN)
English
AMERICAN PHYSICAL SOC (EN)
National Technical University of Athens
Digital Library of National Technical University of Athens | Dspace@NTUA
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