Neutron-induced fission cross sections of ²³²Th and ²³³U up to 1 GeV using parallel plate avalanche counters at the CERN n_TOF facility

Author(s)

, D. Tarrío, L. Tassan-Got, I. Duran, L. S. Leong, C. Paradela, L. Audouin, E. Leal-Cidoncha, C. Le Naour, M. Caamaño, A. Ventura, S. Altstadt, J. Andrzejewski, M. Barbagallo, V. Bécares, F. Bečvář, F. Belloni, E. Berthoumieux, J. Billowes, V. Boccone, D. Bosnar, M. Brugger, M. Calviani, F. Calviño, D. Cano-Ott, C. Carrapiço, F. Cerutti, E. Chiaveri, M. Chin, N. Colonna, G. Cortés, M. A. Cortés-Giraldo, M. Diakaki, C. Domingo-Pardo, N. Dzysiuk, C. Eleftheriadis, A. Ferrari, K. Fraval, S. Ganesan, A. R. García, G. Giubrone, M. B. Gómez-Hornillos, I. F. Gonçalves, E. González-Romero, E. Griesmayer, C. Guerrero, F. Gunsing, P. Gurusamy, C. Lederer, A. Pavlik, A. Wallner

Abstract

The neutron-induced fission cross sections of Th232 and U233 were measured relative to U235 in a wide neutron energy range up to 1 GeV (and from fission threshold in the case of Th232, and from 0.7 eV in case of U233), using the white-spectrum neutron source at the CERN Neutron Time-of-Flight (n_TOF) facility. Parallel plate avalanche counters (PPACs) were used, installed at the Experimental Area 1 (EAR1), which is located at 185 m from the neutron spallation target. The anisotropic emission of fission fragments were taken into account in the detection efficiency by using, in the case of U233, previous results available in EXFOR, whereas in the case of Th232 these data were obtained from our measurement, using PPACs and targets tilted 45° with respect to the neutron beam direction. Finally, the obtained results are compared with past measurements and major evaluated nuclear data libraries. Calculations using the high-energy reaction models INCL++ and ABLA07 were performed and some of their parameters were modified to reproduce the experimental results. At high energies, where no other neutron data exist, our results are compared with experimental data on proton-induced fission. Moreover, the dependence of the fission cross section at 1 GeV with the fissility parameter of the target nucleus is studied by combining those (p,f) data with our (n,f) data on Th232 and U233 and on other isotopes studied earlier at n_TOF using the same experimental setup.

Organisation(s)

Isotope Physics

External organisation(s)

Uppsala University, Universidade de Santiago de Compostela (USC), Université Paris-Saclay, European Commission, Istituto Nazionale di Fisica Nucleare (INFN), Roma, Johann Wolfgang Goethe-Universität Frankfurt am Main, University of Lodz, Centro de Investigaciones Energeticas Medioambientales y Tecnológica, Charles University Prague, IRFU CEA-Saclay laboratory , European Organization for Nuclear Research (CERN), University of Manchester, University of Zagreb, Universitat Politècnica de Catalunya, Universidade de Lisboa, Universidad de Sevilla, National Technical University of Athens (NTUA), Universitat de València, Istituto Nazionale di Fisica Nucleare (INFN), Legnaro, Aristotle University of Thessaloniki, Bhabha Atomic Research Center, Technische Universität Wien

Journal

Physical Review C

Volume

107

No. of pages

21

ISSN

2469-9985

DOI

https://doi.org/10.1103/PhysRevC.107.044616

Publication date

04-2023

Peer reviewed

Yes

Austrian Fields of Science 2012

103014 Nuclear physics

ASJC Scopus subject areas

Nuclear and High Energy Physics

Portal url

https://ucris.univie.ac.at/portal/en/publications/neutroninduced-fission-cross-sections-of-232th-and-233u-up-to-1-gev-using-parallel-plate-avalanche-counters-at-the-cern-ntof-facility(e1d75367-c8d7-4c00-b5d4-ef6ecb67c8cf).html