Measurement of the prompt fission y -rays from slow neutron-induced fission of 235 U with STEFF

The average energy and multiplicity of prompt y -rays from slow neutron-induced fission of 235 U have been measured using the STEFF spectrometer at the neutron time-of-flight facility n_TOF. The individual responses from 11 NaI scintillators were corrected for multiple y -ray interactions, prompt fission neutrons and background counts before being deconvolved to estimate the emitted spectrum of prompt fission y -rays. The results give an average y -ray energy ¯Ey of 1.71(5) MeV and multiplicity ¯vy of 2.66(18) considering y -rays emitted within the energy range 0.8–6.8 MeV. The n_TOF data has a slightly larger ¯Ey and smaller ¯vy than other recent measurements, however the product of the two is in agreement within quoted uncertainties.
This work was supported by the UK Nuclear Data Network, the BEIS Advanced Fuel Cycle programme, the SANDA Nuclear Data Euratom Project, and the funding agencies of the participating institutes.
Article signat per 124 autors/es: T. Wright, A.G.Smith, N. V. Sosnin, S. A. Bennett, P.J.Davies, A. V. Popescu, J. A. Ryan, A. Sekhar, S. Warren, O. Aberle, S. Amaducci, J. Andrzejewski, L. Audouin, M. Bacak, J. Balibrea, M. Barbagallo, F.Becvár, E. Berthoumieux, J. Billowes, D. Bosnar, A.Brown, M. Caamaño, F. Calviño, M. Calviani, D. Cano-Ott, R. Cardella, A. Casanovas, F. Cerutti, Y. H. Chen, E. Chiaveri, N. Colonna, G. Cortés, M. A. Cortés-Giraldo, L. Cosentino, L. A. Damone, M. Diakaki, C. Domingo-Pardo, R. Dressler, E. Dupont, I. Durán, B. Fernández-Domínguez, A. Ferrari, P. Ferreira, P. Finocchiaro, V. Furman, K. Göbel, A. R. García, A. Gawlik-Ramie ̨ga, S. Gilardoni, T. Glodariu, I. F. Gonçalves, E. González-Romero, E. Griesmayer, C. Guerrero, F. Gunsing, H. Harada, S. Heinitz, J. Heyse, D. G. Jenkins, E. Jericha, F. Käppeler, Y. Kadi, A. Kalamara, P. Kavrigin, A. Kimura, N.Kivel, M. Kokkoris, M.Krtiˇcka, D. Kurtulgil, E. Leal-Cidoncha, C. Lederer-Woods, H. Leeb, J. Lerendegui-Marco, S.LoMeo, S. J. Lonsdale, D. Macina, A. Manna, J. Marganiec, T. Martínez, A.Masi, C. Massimi, P. Mastinu, M. Mastromarco, 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, I. Porras, J. Praena, J. M. Quesada, D. Radeck, T. Rauscher, R. Reifarth, C. Rubbia, M. Sabaté-Gilarte, A. Saxena, P. Schillebeeckx, D. Schumann, P. Sedyshev, A. Stamatopoulos, G. Tagliente, J.L.Tain, A. Tarifeño-Saldivia, L. Tassan-Got, S. Valenta, G. Vannini, V. Variale, P.Vaz, A. Ventura, V. Vlachoudis, R.Vlastou, A. Wallner, C. Weiss, P. J. Woods, P. Žugec.
Postprint (published version)