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Analysis of prompt fission neutrons in U-235(nth,f) and fission fragment distributions for the thermal neutron induced fission of U-234
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
EC JRC Inst Reference Mat & Measurements IRMM, Geel, Belgium.
EC JRC Inst Reference Mat & Measurements IRMM, Geel, Belgium..
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2016 (English)In: CNR*15 - 5th International Workshop On Compound-Nuclear Reactions And Related Topics, 2016, article id 01007Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents the ongoing analysis of two fission experiments. Both projects are part of the collaboration between the nuclear reactions group at Uppsala and the JRC-IRMM. The first experiment deals with the prompt fission neutron multiplicity in the thermal neutron induced fission of U-235(n,f). The second, on the fission fragment properties in the thermal fission of U-234(n,f). The prompt fission neutron multiplicity has been measured at the JRC-IRMM using two liquid scintillators in coincidence with an ionization chamber. The first experimental campaign focused on U-235(nth,f) whereas a second experimental campaign is foreseen later for the same reaction at 5.5 MeV. The goal is to investigate how the so-called saw-tooth shape changes as a function of fragment mass and excitation energy. Some harsh experimental conditions were experienced due to the large radiation background. The solution to this will be discussed along with preliminary results. In addition, the analysis of thermal neutron induced fission of U-234(n,f) will be discussed. Currently analysis of data is ongoing, originally taken at the ILL reactor. The experiment is of particular interest since no measurement exist of the mass and energy distributions for this system at thermal energies. One main problem encountered during analysis was the huge background of U-235(nth, f). Despite the negligible isotopic traces in the sample, the cross section difference is enormous. Solution to this parasitic background will be highlighted.

Place, publisher, year, edition, pages
2016. article id 01007
Series
EPJ Web of Conferences, ISSN 2100-014X ; 122
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-314830DOI: 10.1051/epjconf/201612201007ISI: 000389877200007OAI: oai:DiVA.org:uu-314830DiVA, id: diva2:1072068
Conference
5th International Workshop on Compound-Nuclear Reactions and Related Topics (CNR), OCT 19-23, 2015, Tokyo, JAPAN
Available from: 2017-02-07 Created: 2017-02-06 Last updated: 2017-02-07Bibliographically approved

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Al-Adili, AliTarrío, DiegoJansson, KajSolders, AndreasRakopoulos, VasileiosGustavsson, CeciliaLantz, MattiasMattera, AndreaProkofiev, Alexander V.Österlund, MichaelPomp, Stephan
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