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High-accuracy determination of the 238U/ 235U fission cross section ratio up to ≈ 1 GeV at n_TOF at CERN

 

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Opened Access High-accuracy determination of the 238U/ 235U fission cross section ratio up to ≈ 1 GeV at n_TOF at CERN
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Author: Paradela, Carlos
Calviani, M.
Tarrío, D.
Leal Cidoncha, E.
Leong, L. S.
Tassan-Got, L.
Le Naour, C.
Durán, Ignacio
Colonna, Nicola
Audouin, Laurent
Cortés Giraldo, Miguel Antonio
Lozano Leyva, Manuel Luis
Quesada Molina, José Manuel
Praena Rodríguez, Javier
Department: Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear
Date: 2015
Published in: Physical Review C - Nuclear Physics, 91 (2), 1-11.
Document type: Article
Abstract: The 238U to 235U fission cross section ratio has been determined at n_TOF up to ≈1 GeV, with two different detection systems, in different geometrical configurations. A total of four datasets has been collected and compared. They are all consistent to each other within the relative systematic uncertainty of 3–4%. The data collected at n_TOF have been suitably combined to yield a unique fission cross section ratio as a function of neutron energy. The result confirms current evaluations up to 200 MeV. Good agreement is also observed with theoretical calculations based on the INCL++/Gemini++ combination up to the highest measured energy. The n_TOF results may help solve a long-standing discrepancy between the two most important experimental datasets available so far above 20 MeV, while extending the neutron energy range for the first time up to ≈1 GeV.
Cite: Paradela, C., Calviani, M., Tarrío, D., Leal Cidoncha, E., Leong, L.S., Tassan-Got, L.,...,Praena Rodríguez, J. (2015). High-accuracy determination of the 238U/ 235U fission cross section ratio up to ≈ 1 GeV at n_TOF at CERN. Physical Review C - Nuclear Physics, 91 (2), 1-11.
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URI: https://hdl.handle.net/11441/69493

DOI: 10.1103/PhysRevC.91.024602

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