The measurement of the Pb-206(n,gamma) cross section and stellar implications

Author(s)

C. Domingo-Pardo, U. Abbondanno, G. Aerts, H. Alvarez, F. Alvarez-Velarde, S. Andriamonje, J. Andrzejewski, P. Assimakopoulos, L. Audouin, G. Badurek, P. Baumann, F. Becvar, E. Berthoumieux, S. Bisterzo, F. Calvino, M. Calviani, D. Cano-Ott, R. Capote, C. Carrapico, P. Cennini, V. Chepel, N. Colonna, G. Cortes, A. Couture, J. Cox, M. Dahlfors, S. David, I. Dillmann, W. Dridi, I. Duran, C. Eleftheriadis, M. Embid-Segura, L. Ferrant, A. Ferrari, R. Ferreira-Marques, K. Fujii, W. Furman, R. Gallino, I. Goncalves, E. Gonzalez-Romero, F. Gramegna, C. Guerrero, F. Gunsing, B. Haas, R. Haight, M. Heil, A. Herrera-Martinez, M. Igashira, E. Jericha, Y. Kadi, F. Kaeppeler, D. Karadimos, D. Karamanis, M. Kerveno, P. Koehler, E. Kossionides, M. Krticka, C. Lamboudis, H. Leeb, A. Lindote, I. Lopes, M. Lozano, S. Lukic, J. Marganiec, S. Marrone, C. Massimi, P. Mastinu, A. Mengoni, P. M. Milazzo, M. Mosconi, F. Neves, H. Oberhummer, S. O'Brien, J. Pancin, C. Papachristodoulou, C. Papadopoulos, C. Paradela, N. Patronis, A. Pavlik, P. Pavlopoulos, L. Perrot, M. T. Pigni, R. Plag, A. Plompen, A. Plukis, A. Poch, C. Pretel, J. Quesada, T. Rauscher, R. Reifarth, C. Rubbia, G. Rudolf, P. Rullhusen, J. Salgado, C. Santos, L. Sarchiapone, I. Savvidis, 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. Vlachoudis, R. Vlastou, F. Voss, S. Walter, M. Wiescher, K. Wisshak

Abstract

The neutron capture cross section of ²⁰⁶Pb has been measured at the CERN n\TOF spectrometer using a setup of two C₆D₆

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 ²⁰⁶Pb

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 ²⁰⁶Pb is dominated by α-back decays of short-lived transbismuth isotopes.

Organisation(s)

Isotope Physics

External organisation(s)

Karlsruher Institut für Technologie, Istituto Nazionale di Fisica Nucleare (INFN), Roma, Universidade de Santiago de Compostela (USC), Centro de Investigaciones Energeticas Medioambientales y Tecnológica, University of Lodz, University of Ioannina, Technische Universität Wien, Centre National de la Recherche Scientifique (CNRS), Strasbourg , Charles University Prague, University of Turin, Universitat Politècnica de Catalunya, Universidad de Sevilla, Universidade de Lisboa, European Organization for Nuclear Research (CERN), Universidade de Coimbra, University of Notre Dame, Aristotle University of Thessaloniki, Centre National De La Recherche Scientifique (CNRS), Joint Institute for Nuclear Research, Los Alamos National Laboratory, Tokyo Institute of Technology (TIT), National Centre for Scientific Research Demokritos (NCSR), University of Bologna, National Technical University of Athens (NTUA), Pôle universitaire Léonard-de-Vinci, Commiss European Communities, Joint Res Ctr, Inst Reference Mat & Measurements, Universität Basel, Università degli studi di Pavia, Instituto de Física Corpuscular (IFIC), Università degli Studi di Salerno, French Alternative Energies and Atomic Energy Commission (CEA), International Atomic Energy Agency (IAEA), GSI Helmholtzzentrum für Schwerionenforschung, Oak Ridge National Laboratory

Journal

Journal of Physics G: Nuclear and Particle Physics

Volume

35

No. of pages

6

ISSN

0954-3899

DOI

https://doi.org/10.1088/0954-3899/35/1/014020

Publication date

01-2008

Peer reviewed

Yes

Austrian Fields of Science 2012

103014 Nuclear physics

Keywords

Portal url

https://ucrisportal.univie.ac.at/en/publications/53f8270f-d875-4470-b371-6a88009265de