# Fission Fragment Angular Distribution measurements of 235U and 238U at CERN n_TOF facility

Leal-Cidoncha, E.; Durán, I.; Paradela, C.; Tarrío, D.; Leong, L.S.; Tassan-Got, L.; Audouin, L.; Altstadt, S.; Andrzejewski, J.; Barbagallo, M.; Bécares, V.; Bečvář, F.; Belloni, F.; Berthoumieux, E.; Billowes, J.; Boccone, V.; Bosnar, D.; Brugger, M.; Calviani, M.; Calviño, F.; ... mehr

Abstract:
Neutron-induced fission cross sections of $^{238}$U and $^{235}$U are used as standards in the fast neutron region up to 200 MeV. A high accuracy of the standards is relevant to experimentally determine other neutron reaction cross sections. Therefore, the detection efficiency should be corrected by using the angular distribution of the fission fragments (FFAD), which are barely known above 20 MeV. In addition, the angular distribution of the fragments produced in the fission of highly excited and deformed nuclei is an important observable to investigate the nuclear fission process. In order to measure the FFAD of neutron-induced reactions, a fission detection setup based on parallel-plate avalanche counters (PPACs) has been developed and successfully used at the CERN-n_TOF facility. In this work, we present the preliminary results on the analysis of new $^{235}$U(n,f) and $^{238}$U(n,f) data in the extended energy range up to 200 MeV compared to the existing experimental data.

 Zugehörige Institution(en) am KIT Institut für Kernphysik (IKP) Publikationstyp Zeitschriftenaufsatz Jahr 2016 Sprache Englisch Identifikator ISSN: 2100-014XKITopen-ID: 1000065045 HGF-Programm 51.03.04 (POF III, LK 01) Erschienen in The European physical journal / Web of Conferences Band 111 Seiten 10002 Nachgewiesen in Scopus
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