New measurement of neutron capture resonances in Bi-209 (Journal article)

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

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.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών
Keywords: galactic chemical evolution,cross-section,s-process,chronometers,abundances,facility,detector,elements,system,stars
URI: https://olympias.lib.uoi.gr/jspui/handle/123456789/17527
ISSN: 0556-2813
Link: <Go to ISI>://000240239100068
http://prc.aps.org/abstract/PRC/v74/i2/e025807
Appears in Collections:Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά)

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