High accuracy, high resolution ²³⁵U(n,f) cross section from n_TOF (CERN) from 18 meV to 10 keV

Autor(en)

M. Mastromarco, S. Amaducci, N. Colonna, P. Finocchiaro, L. Cosentino, M. Barbagallo, O. Aberle, J. Andrzejewski, L. Audouin, M. Bacak, J. Balibrea, F. Becvar, E. Berthoumieux, J. Billowes, D. Bosnar, A. Brown, M. Caamano, F. Calvino, M. Calviani, D. Cano-Ott, R. Cardella, A. Casanovas, F. Cerutti, Y. H. Chen, E. Chiaveri, G. Cortes, M. A. Cortes-Giraldo, L. A. Damone, M. Diakaki, C. Domingo-Pardo, D. Diacono, R. Dressler, E. Dupont, Adil Duran, B. Fernandez-Dominguez, A. Ferrari, P. Ferreira, Walter I. Furman, K. Goebel, A. R. Garcia, A. Gawlik, S. Gilardoni, T. Glodariu, I. F. Goncalves, E. Gonzalez-Romero, E. Griesmayer, C. Guerrero, F. Gunsing, H. Harada, S. Heinitz, J. Heyse, D. G. Jenkins, E. Jericha, F. Kaeppeler, Y. Kadi, A. Kalamara, P. Kavrigin, A. Kimura, N. Kivel, Ingrid Knapova, M. Kokkoris, M. Krticka, D. Kurtulgil, E. Leal-Cidoncha, C. Lederer, H. Leeb, J. Lerendegui-Marco, S. LoMeo, S. J. Lonsdale, D. Macina, A. Manna, J. Marganiec, T. Martinez, A. Masi, C. Massimi, P. Mastinu, E. A. Maugeri, A. Mazzone, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, A. Musumarra, A. Negret, R. Nolte, A. Oprea, N. Patronis, A. Pavlik, J. Perkowski, Darren Porras, J. Praena, J. M. Quesada, D. Radeck, T. Rauscher, R. Reifarth, C. Rubbia, J. A. Ryan, M. Sabate-Gilarte, A. Saxena, P. Schillebeeckx, D. Schumann, P. Sedyshev, A. G. Smith, N. Sosnin, A. Stamatopoulos, G. Tagliente, J. L. Tain, A. Tarifeno-Saldivia, L. Tassan-Got, S. Valenta, G. Vannini, V. Variale, P. Vaz, A. Ventura, V. Vlachoudis, R. Vlastou, A. Wallner, S. Warren, C. Weiss, P. J. Woods, T. Wright, P. Zugec

Abstrakt

The

²³⁵U(n,f) cross section was measured in a wide energy range (18 meV–170 keV) at the n_TOF facility at CERN, relative to

⁶Li(n,t) and

¹⁰B(n,α) standard reactions, with high resolution and accuracy, with a setup based on a stack of six samples and six silicon detectors placed in the neutron beam. In this paper we report on the results in the region between 18 meV and 10 keV neutron energy. A resonance analysis has been performed up to 200 eV, with the code SAMMY. The resulting fission kernels are compared with the ones extracted on the basis of the resonance parameters of the most recent major evaluated data libraries. A comparison of the n_TOF data with the evaluated cross sections is also performed from thermal to 10 keV neutron energy for the energy-averaged cross section in energy groups of suitably chosen width. A good agreement, within 0.5%, is found on average between the new results and the latest evaluated data files ENDF/B-VIII.0 and JEFF-3.3, as well as with respect to the broad group average fission cross section established in the framework of the standard working group of IAEA (the so-called reference file). However, some discrepancies, of up to 4%, are still present in some specific energy regions. The new dataset here presented, characterized by a unique combination of high resolution and accuracy, low background and wide energy range, can help to improve the evaluations from the Resolved Resonance Region up to 10 keV, also reducing the uncertainties that affect this region.

Organisation(en)

Isotopenphysik

Externe Organisation(en)

Istituto Nazionale di Fisica Nucleare (INFN), Roma, Università degli Studi di Bari Aldo Moro, European Organization for Nuclear Research (CERN), Medical University of Lodz, Centre National De La Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS), Strasbourg , Icm & Sorbonne University, UMR EcoSys, Technische Universität Wien, DIF, CEA, DAM, CEA, Centro de Investigaciones Energeticas Medioambientales y Tecnológica, Charles University Prague, Manchester Metropolitan University, University of Zagreb, York University, Universidade de Santiago de Compostela (USC), Universitat Politècnica de Catalunya, Universidad de Sevilla, Instituto de Física Corpuscular (IFIC), Universidad Internacional de Valencia, Eidgenössische Technische Hochschule Zürich, Paul Scherrer Institute, Universidade Técnica de Lisboa, Instituto Superior Técnico, Joint Institute for Nuclear Research, Johann Wolfgang Goethe-Universität Frankfurt am Main, Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering, Japan Atomic Energy Agency, European Commission Joint Research Centre, Helmholtz-Zentrum Berlin für Materialien und Energie, Karlsruher Institut für Technologie, National Technical University of Athens (NTUA), University of Edinburgh, Agenzia nazionale per le nuove tecnologie, l’energia e lo sviluppo economico sostenibile, Università di Bologna, Physikalisch-Technische Bundesanstalt, Consiglio Nazionale delle Ricerche, Università degli Studi di Catania, University of Ioannina, Universidad de Granada, Universitätsspital Basel, University of Hertfordshire, Bhabha Atomic Research Center, Australian National University

Journal

European Physical Journal A

Band

58

Anzahl der Seiten

13

ISSN

1434-6001

DOI

https://doi.org/10.1140/epja/s10050-022-00779-7

Publikationsdatum

08-2022

Peer-reviewed

Ja

ÖFOS 2012

103014 Kernphysik

Schlagwörter

ASJC Scopus Sachgebiete

Nuclear and High Energy Physics

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/c884bb80-0a09-4fba-a495-37a692c8f4f4