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Fission Fragment Angular Distribution measurements of 235U and 238U at CERN n_TOF facility
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.ORCID iD: 0000-0002-9858-3341
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2016 (English)Conference paper, Published paper (Refereed)
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Text
Abstract [en]

Neutron-induced fission cross sections of U-238 and U-235 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 U-235(n,f) and U-238(n,f) data in the extended energy range up to 200 MeV compared to the existing experimental data.

Place, publisher, year, edition, pages
2016. Vol. 111
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-285241DOI: 10.1051/epjconf/201611110002ISI: 000372797000036OAI: oai:DiVA.org:uu-285241DiVA: diva2:921153
Conference
WONDER-2015 – 4th International Workshop On Nuclear Data Evaluation for Reactor applications
Available from: 2016-04-19 Created: 2016-04-19 Last updated: 2016-07-14Bibliographically approved

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CiteExportLink to record
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