Neutron capture cross section measurement of 238U at the CERN n_TOF facility in the energy region from 1 eV to 700 keV

Mingrone, F. and Massimi, C. and Vannini, G. and Colonna, N. and Gunsing, F. and Žugec, Petar and Altstadt, S. and Andrzejewski, J. and Audouin, L. and Barbagallo, M. and Becares, V. and Bečvar, F. and Belloni, F. and Berthoumieux, E. and Billowes, J. and Bosnar, Damir and Brugger, M. and Calviani, M. and Calvino, F. and Cano-Ott, D. and Carrapico, C. and Cerutti, F. and Chiaveri, E. and Chin, M. and Cortés, G. and Cortes-Giraldo, M. A. and Diakaki, M. and Domingo-Pardo, C. and Duran, I. and Dressler, R. and Eleftheriadis, C. and Ferrari, A. and Fraval, K. and Ganesan, S. and Garcia, A. R. and Giubrone, G. and Gonzalves, I. F. and Gonzalez-Romero, E. and Griesmayer, E. and Guerrero, C. and Hernández-Prieto, A. and Jenkins, D. G. and Jericha, E. and Kadi, Y. and Kappeler, F. and Karadimos, D. and Kivel, N. and Koehler, P. and Kokkoris, M. and Krtička, M. and Kroll, J. and Lampoudis, C. and Langer, C. and Leal-Cidoncha, E. and Lederer, C. and Leeb, H. and Leong, L. S. and Lo Meo, S. and Losito, R. and Mallick, A. and Manousos, A. and Marganiec, J. and Martinez, T. and Mastinu, P. F. and Mastromarco, M. and Mendoza, E. and Mengoni, A. and Milazzo, P. M. and Mirea, M. and Mondalaers, W. and Paradela, C. and Pavlik, A. and Perkowski, J. and Plompen, A. and Praena, J. and Quesada, J. M. and Rauscher, T. and Reifarth, R. and Riego, A. and Robles, M. S. and Rubbia, C. and Sabate-Gilarte, M. and Sarmento, R. and Saxena, A. and Schillebeeckx, P. and Schmidt, S. and Schumann, D. and Tagliente, G. and Tain, J. L. and Tarrio, D. and Tassan-Got, L. and Tsinganis, A. and Valenta, S. and Variale, V. and Vaz, P. and Ventura, A. and Vermeulen, M. J. and Vlachoudis, V. and Vlastou, R. and Wallner, A. and Ware, T. and Weigand, M. and Weiss, C. and Wright, T. (n_TOF Collaboration) (2017) Neutron capture cross section measurement of 238U at the CERN n_TOF facility in the energy region from 1 eV to 700 keV. Physical Review C, 95 (3). pp. 34604-14. ISSN 2469-9985

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Abstract

The aim of this work is to provide a precise and accurate measurement of the 238U(n, γ) reaction cross section in the energy region from 1 eV to 700 keV. This reaction is of fundamental importance for the design calculations of nuclear reactors, governing the behavior of the reactor core. In particular, fast reactors, which are experiencing a growing interest for their ability to burn radioactive waste, operate in the high energy region of the neutron spectrum. In this energy region most recent evaluations disagree due to inconsistencies in the existing measurements of up to 15%. In addition, the assessment of nuclear data uncertainty performed for innovative reactor systems shows that the uncertainty in the radiative capture cross section of 238U should be further reduced to 1–3% in the energy region from 20 eV to 25 keV. To this purpose, addressed by the Nuclear Energy Agency as a priority nuclear data need, complementary experiments, one at the GELINA and two at the n_TOF facility, were proposed and carried out within the 7th Framework Project ANDES of the European Commission. The results of one of these 238U(n, γ) measurements performed at the n_TOF CERN facility are presented in this work. The γ-ray cascade following the radiative neutron capture has been detected exploiting a setup of two C6D6 liquid scintillators. Resonance parameters obtained from this work are on average in excellent agreement with the ones reported in evaluated libraries. In the unresolved resonance region, this work yields a cross section in agreement with evaluated libraries up to 80 keV, while for higher energies our results are significantly higher.

Item Type: Article
Keywords: neutron capture, 238U, n_TOF
Date: 10 March 2017
Subjects: NATURAL SCIENCES > Physics
Additional Information: Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Received 30 November 2016. Published 10 March 2017.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 28 Sep 2017 11:44
Last Modified: 28 Sep 2017 11:44
URI: http://digre.pmf.unizg.hr/id/eprint/5590

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