Fission Fragment Angular Distribution measurements of U-235 and U-238 at CERN n_TOF facility

E. Leal-Cidoncha, I. Duran, C. Paradela, D. Tarrio, L. S. Leong, L. Tassan-Got, L. Audouin, S. Altstadt, J. Andrzejewski, M. Barbagallo, V. Becares, F. Becvar, F. Belloni, E. Berthoumieux, J. Billowes, V. Boccone, D. Bosnar, M. Brugger, M. Calviani, F. Calvino, D. Cano-Ott, C. Carrapico, F. Cerutti, E. Chiaveri, M. Chin, N. Colonna, G. Cortes, M. A. Cortes-Giraldo, M. Diakaki, C. Domingo-Pardo, R. Dressler, N. Dzysiuk, C. Eleftheriadis, A. Ferrari, K. Fraval, S. Ganesan, A. R. Garcia, G. Giubrone, M. B. Gomez-Hornillos, I. F. Goncalves, E. Gonzalez-Romero, E. Griesmayer, C. Guerrero, F. Gunsing, P. Gurusamy, A. Hernandez-Prieto, D. G. Jenkins, E. Jericha, Y. Kadi, F. Kaeppeler, D. Karadimos, N. Kivel, P. Koehler, M. Kokkoris, M. Krticka, J. Kroll, C. Lampoudis, C. Langer, C. Lederer, H. Leeb, S. Lo Meo, R. Losito, A. Mallick, A. Manousos, J. Marganiec, T. Martinez, C. Massimi, P. F. Mastinu, M. Mastromarco, M. Meaze, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, M. Mirea, W. Mondelaers, A. Pavlik, J. Perkowski, A. Plompen, J. Praena, J. M. Quesada, T. Rauscher, R. Reifarth, A. Riego, M. S. Robles, F. Roman, C. Rubbia, M. Sabate-Gilarte, R. Sarmento, A. Saxena, P. Schillebeeckx, S. Schmidt, D. Schumann, G. Tagliente, J. L. Tain, A. Tsinganis, S. Valenta, G. Vannini, V. Variale, P. Vaz, A. Ventura, R. Versaci, M. J. Vermeulen, V. Vlachoudis, R. Vlastou, A. Wallner, T. Ware, M. Weigand, C. Weiss, T. Wright, P. Zugec

Neutron-induced fission cross sections of U-238 and U-235 are used as standards in the fast neutron region up to 200 MeV. A high accuracy of the standards is relevant to experimentally determine other neutron reaction cross sections. Therefore, the detection efficiency should be corrected by using the angular distribution of the fission fragments (FFAD), which are barely known above 20 MeV. In addition, the angular distribution of the fragments produced in the fission of highly excited and deformed nuclei is an important observable to investigate the nuclear fission process.

In order to measure the FFAD of neutron-induced reactions, a fission detection setup based on parallel-plate avalanche counters (PPACs) has been developed and successfully used at the CERN-n_TOF facility. In this work, we present the preliminary results on the analysis of new U-235(n,f) and U-238(n,f) data in the extended energy range up to 200 MeV compared to the existing experimental data.

Externe Organisation(en)
Universidade de Santiago de Compostela (USC), Institute for Reference Materials and Measurements, Uppsala University, Institut de Physique Nucléaire d'Orsay (IPN), Johann Wolfgang Goethe-Universität Frankfurt am Main, University of Lodz, Istituto Nazionale di Fisica Nucleare, Roma, Centro de Investigaciones Energeticas Medioambientales y Tecnológica, Charles University Prague, French Atomic Energy Commission (CEA), University of Manchester, European Organization for Nuclear Research (CERN), University of Zagreb, Universitat Politècnica de Catalunya, Universidade de Lisboa, Universidad de Sevilla, Instituto de Física Corpuscular (IFIC), Paul Scherrer Institute, Aristotle University of Thessaloniki, Bhabha Atom Res Ctr, Bhabha Atomic Research Center, Technische Universität Wien, York University, Karlsruher Institut für Technologie, National Technical University of Athens (NTUA), University of Oslo (UiO), Agenzia Nazl Nuove Tecnol Energia & Sviluppo Econ, Università degli Studi di Bologna, Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN HH), Universität Basel, University of Hertfordshire, Australian National University
Anzahl der Seiten
ÖFOS 2012
103014 Kernphysik
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