Title: New measurement of neutron capture resonances in Bi-209
Authors: Domingo-Pardo, C ×
Abbondanno, U
Aerts, G
Alvarez-Pol, H
Alvarez-Velarde, F
Andriamonje, S
Andrzejewski, J
Assimakopoulos, P
Audouin, L
Badurek, G
Baumann, P
Rudolf, G
Rullhusen, P
Salgado, J
Sarchiapone, L
Savvidis, I
Stephan, C
Tagliente, G
Tain, J. L
Tassan-Got, L
Tavora, L
Becvar, F
Terlizzi, R
Vannini, G
Vaz, P
Ventura, A
Villamarin, D
Vincente, M. C
Vlachoudis, V
Vlastou, R
Voss, F
Walter, S
Berthoumieux, E
Wendler, H
Wiescher, M
Wisshak, K #
Calvino, F
Cano-Ott, D
Capote, R
de Albornoz, A. Carrillo
Cennini, P
Chepel, V
Chiaveri, E
Colonna, N
Cortes, G
Couture, A
Cox, J
Dahlfors, M
David, Solomon Arulraj
Dillman, I
Dolfini, R
Dridi, W
Duran, I
Eleftheriadis, C
Embid-Segura, M
Ferrant, L
Ferrari, A
Ferreira-Marques, R
Fitzpatrick, L
Frais-Koelbl, H
Fujii, K
Furman, W
Gallino, R
Goncalves, I
Gonzalez-Romero, E
Goverdovski, A
Gramegna, F
Griesmayer, E
Guerrero, C
Gunsing, F
Haas, B
Haight, R
Heil, M
Herrera-Martinez, A
Igashira, M
Isaev, S
Jericha, E
Kadi, Y
Kappeler, F
Karamanis, D
Karadimos, D
Kerveno, M
Ketlerov, V
Koehler, P
Konovalov, V
Kossionides, E
Krticka, M
Lamboudis, C
Leeb, H
Lindote, A
Lopes, I
Lozano, M
Lukic, S
Marganiec, J
Marques, L
Marrone, S
Mastinu, P
Mengoni, A
Milazzo, P. M
Moreau, C
Mosconi, M
Neves, F
Oberhummer, H
Oshima, M
O'Brien, S
Pancin, J
Papachristodoulou, C
Papadopoulos, C
Paradela, C
Patronis, Nikolaos
Pavlik, A
Pavlopoulos, P
Perrot, L
Plag, R
Plompen, A
Plukis, A
Poch, A
Pretel, C
Quesada, J
Rauscher, T
Reifarth, R
Rosetti, M
Rubbia, C
Issue Date: Aug-2006
Publisher: Published for the American Physical Society by the American Institute of Physics
Series Title: Physical Review. C, Nuclear physics vol:74 issue:2 pages:1-10
Abstract: The neutron capture cross section of Bi-209 has been measured at the CERN n_TOF facility by employing the pulse-height-weighting technique. Improvements over previous measurements are mainly because of an optimized detection system, which led to a practically negligible neutron sensitivity. Additional experimental sources of systematic error, such as the electronic threshold in the detectors, summing of gamma-rays, internal electron conversion, and the isomeric state in bismuth, have been taken into account. gamma-Ray absorption effects inside the sample have been corrected by employing a nonpolynomial weighting function. Because Bi-209 is the last stable isotope in the reaction path of the stellar s-process, the Maxwellian averaged capture cross section is important for the recycling of the reaction flow by alpha decays. In the relevant stellar range of thermal energies between kT=5 and 8 keV our new capture rate is about 16% higher than the presently accepted value used for nucleosynthesis calculations. At this low temperature an important part of the heavy Pb-Bi isotopes are supposed to be synthesized by the s-process in the He shells of low mass, thermally pulsing asymptotic giant branch stars. With the improved set of cross sections we obtain an s-process fraction of 19 +/- 3% of the solar bismuth abundance, resulting in an r-process residual of 81 +/- 3%. The present (n,gamma) cross-section measurement is also of relevance for the design of accelerator driven systems based on a liquid metal Pb/Bi spallation target.
ISSN: 0556-2813
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Non-KU Leuven Association publications
× corresponding author
# (joint) last author

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