Open Access

Nicholas Terranova, Oliver Aberle, Victor Alcayne, Simone Amaducci, Józef Andrzejewski, Laurent Audouin, Victor Babiano Suarez, Michael Bacak, Massimo Barbagallo, Samuel Bennett, Eric Berthoumieux, Damir Bosnar, Adam S. Brown, Maurizio Busso, Manuel Caamaño, Luis Caballero Ontanaya, Marco Calviani, Francisco Calviño Tavares, Daniel Cano-Ott, Adrià Casanovas Hoste, Francesco Cerutti, Enrico Chiaveri, Nicola Colonna, Guillem Pere Cortés Rossell, Miguel Antonio Cortés-Giraldo, Luigi Cosentino, Sergio Cristallo, Lucia Anna Damone, Paul John Davies, Maria Diakaki, Mirco Dietz, César Domingo-Pardo, Rugard Dressler, Quentin Ducasse, Emmeric Dupont, Ignacio Durán, Zinovia Eleme, Beatriz Fernández Domínguez, Alfredo Ferrari, Isabel Maria Ferro Gonçalves, Paolo Finocchiaro, Valter Furman, Ruchi Garg, Aleksandra Gawlik, Simone Gilardoni, Kathrin Göbel, Enrique Miguel González Romero, Carlos Guerrero Sánchez, Frank Gunsing, Stephan Heinitz, Jan Heyse, David Jenkins, Erwin Jericha, U. Jiri, Arnd Rudolf Junghans, Yacine Kadi, Franz Käppeler, Atsushi Kimura, Ingrid Knapová, Michael Kokkoris, Yuri N. Kopatch, Milan Krtička, Cem Deniz Kurtulgil, Ion Ladarescu, Claudia Lederer-Woods, Jorge Lerendegui-Marco, Sarah-Jane Lonsdale, Daniela Macina, Alice Manna, Trinitario Martı́nez, Alessandro Masi, Cristian Massimi, Pierfrancesco Mastinu, Mario Mastromarco, Emilio Andrea Maugeri, Annamaria Mazzone, Emilio Mendoza Cembranos, Alberto Mengoni, Veatriki Michalopoulou, Paolo Maria Milazzo, María de los Ángeles Millán Callado, Federica Mingrone, Javier Moreno-Soto, Agatino Musumarra, Alexandru Negret, Francisco Ogállar Ruiz, Andreea Oprea, Nikolas Patronis, Andreas Pavlik, Jarosław Perkowski, Cristina Petrone, Luciano Piersanti, Elisa Pirovano, José Ignacio Porras Sánchez, Javier Praena, José Manuel Quesada Molina, Diego Ramos Doval, René Reifarth, Dimitri Rochman, Carlo Rubbia, Marta Sabaté-Gilarte, Alok Saxena, Peter Schillebeeckx, Dorothea Schumann, Adhitya Sekhar, Alastair Gavin Smith, Nikolay V. Sosnin, Peter Sprung, Athanasios Stamatopoulos, Giuseppe Tagliente, José Luis Taı́n Enríquez, Ariel Tarifeño-Saldivia, Laurent Tassan-Got, Benedikt Thomas, Pablo Torres-Sánchez, Andrea Tsinganis, Sebastian Urlaß, Stanislav Valenta, Gianni Vannini, Vincenzo Variale, Pedro Vaz, Alberto Ventura, Diego Vescovi, Vasilis Vlachoudis, Rosa Vlastou, Anton Wallner, Philip John Woods, Tobias J. Wright, Petar Žugec

• The neutron-induced fission cross section of 235U, a standard at thermal energy and between 0.15 MeV and 200 MeV, plays a crucial role in nuclear technology applications. The long-standing need of improving cross section data above 20 MeV and the lack of experimental data above 200 MeV motivated a new experimental campaign at the n_TOF facility at CERN. The measurement has been performed in 2018 at the experimental area 1 (EAR1), located at 185 m from the neutron-producing target (the experiment is presented by A. Manna et al. in a contribution to this conference). The 235U(n,f) cross section from 20 MeV up to about 1 GeV has been measured relative to the 1H(n,n)1H reaction, which is considered the primary reference in this energy region. The neutron flux impinging on the 235U sample (a key quantity for determining the fission events) has been obtained by detecting recoil protons originating from n-p scattering in a C2H4 sample. Two Proton Recoil Telescopes (PRT), consisting of several layers of solid-state detectors and fast plastic scintillators, have been located at proton scattering angles of 25.07° and 20.32°, out of the neutron beam. The PRTs exploit the ΔE-E technique for particle identification, a basic requirement for the rejection of charged particles from neutron-induced reactions in carbon. Extensive Monte Carlo simulations were performed to characterize proton transport through the different slabs of silicon and scintillation detectors, to optimize the experimental set-up and to deduce the efficiency of the whole PRT detector. In this work we compare measured data collected with the PRTs with a full Monte Carlo simulation based on the Geant-4 toolkit.