Improved lead and bismuth (n,gamma) cross sections and their astrophysical impact

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, F. Calvino, M. Calviani, D. Cano-Ott, R. Capote, C. Carrapico, P. Cennini, V. ChepelE. Chiaveri, 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, I. Goncalves, E. Gonzalez-Romero, F. Gramegna, C. Guerrero, F. Gunsing, B. Haas, R. Haight, M. Heil, A. Herrera-Martinez, M. Igashira, E. Jericha, F. Kaeppeler, T. Rauscher, n TOF Collaboration

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Abstract

A series of (n,gamma) neutron capture measurements on the lead isotopes and bismuth have been carried Out at the CERN n_TOF installation in the neutron energy range from 1 eV up to 1 MeV. At n_TOF, contaminations due to scattered neutrons were reduced down to a negligible level by using improved gamma-ray detectors with very low neutron sensitivity. The background level has been determined precisely from a complementary measurement. Other experimental effects related to the electronic threshold in the detectors and the angular distribution of the prompt gamma-rays were investigated via Monte Carlo simulations and could be taken in account in the analysis of the capture data. With this set of measurements the energy differential (n,gamma) cross sections of (204,206,207)Pb and (209)Bi have been determined with good accuracy. The information obtained in this work becomes of interest for constraining r-process calculations and in particular for the Th/U cosmochronometer.

Original languageEnglish
Title of host publicationProcs Int Conf on Nuclear Data for Science and Technology
Subtitle of host publicationND2007
EditorsO. Bersillon, F. Gunsing, E. Bauge, R. Jacqmin, S. Leray
PublisherEDP Sciences
Pages1311-1314
Number of pages4
Volume2
ISBN (Print)978-2-7598-0091-9
DOIs
Publication statusPublished - 2008
EventInternational Conference on Nuclear Data for Science and Technology - Nice, France
Duration: 22 Apr 200727 Apr 2007

Conference

ConferenceInternational Conference on Nuclear Data for Science and Technology
Country/TerritoryFrance
CityNice
Period22/04/0727/04/07

Keywords

  • CHRONOMETERS
  • DETECTOR
  • GIANT BRANCH STARS
  • RESONANCE NEUTRON-CAPTURE
  • NUCLEOSYNTHESIS
  • TRANSMISSION
  • CERN
  • GALACTIC CHEMICAL EVOLUTION

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