Bochum 2009 – wissenschaftliches Programm
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HK: Fachverband Hadronen und Kerne
HK 77: Nuclear Physics Applications
HK 77.5: Vortrag
Donnerstag, 19. März 2009, 17:45–18:00, H-ZO 100
Measurement of neutron-induced fission cross sections of Pb-nat and Bi-209 up to 1 GeV — •Diego Tarrío1, Ignacio Durán1, Carlos Paradela1, and Laurent Tassan-Got2 — 1Universidade de Santiago de Compostela (Spain) — 2Centre National de la Recherche Scientifique/IN2P3-IPN, Orsay (France)
Lead and bismuth are widely proposed as candidate materials for the spallation source to be used in ADS fast reactors. On the other hand, Bi-209 fission cross section has been proposed as a new standard for neutron-induced fission in the subactinides region. Despite their importance for such applications, available data on fission about these elements are very scarce mainly due to its small cross section, of the order of tens of mb, while for the actinides is of the order of few barns. So, new and more precise measurements have been required by the international organizations (IAEA, OECD-NEA...)
The n_TOF facility at CERN provides a unique very-intensive and high energy resolution neutron beam, from 1 eV to 1 GeV. Fission Fragments in temporal coincidence were measured using a dedicated reaction chamber, developed at IPNO, based on PPAC detectors. Pb-nat and Bi-209 fission cross-sections have been measured using samples of U-235 and U-238 as references.
In this work, we present the n_TOF results about the cross sections of Pb-nat and Bi-209 from fission threshold up to 1 GeV.