1. High-accuracy determination of the 238U/235U fission cross section ratio up to ≈ 1 GeV at n_TOF at CERN.
- Author
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Paradela, C., Calviani, M., Tarrio, D., Leal-Cidoncha, E., Leong, L. S., Tassan-Got, L., Le Naour, C., Duran, I., Colonna, N., Audouin, L., Mastromarco, M., Lo Meo, S., Ventura, A., Aerts, G., Altstadt, S., Álvarez, H., Álvarez-Velarde, F., Andriamonje, S., Andrzejewski, J., and Badurek, G.
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URANIUM isotopes , *FISSION cross sections , *NEUTRON temperature , *NUCLEAR physics , *NUCLEAR fission - 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. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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