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Analysis of the FIC detector data at the n_TOF facility |
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| Authors: | D. Karadimos R. Vlastou P. Assimakopoulos P. Pavlopoulos C. Papachristodoulou V. Vlachoudis V. Ketlerov for the n_TOF collaboration |
| Affiliation: | a University of Ioannina, PO Box 1186, Panepistimioupoli, GR-451 10 Ioánnina, Greece b National Technical University of Athens, 9, Heroon Polytechneiou Street, GR-157 80 Athens, Greece c Democritus University of Thrace, University Campus, 69100 Komotini, Greece d Paris, La Defense, 92 916 Paris La Défense Cedex, France e CERN, CH-1211 Genève 23, Geneva, Switzerland f Institute of Physics and Power Engineering, Federal State Unitary Enterprise “SSC RF - IPPE” 249033, Obninsk, Kaluga region. Sq. Bondarenko, 1, Russia g Joint Institute for Nuclear Research, 141980, Moskovskaya obl., Joliot-Curie st., 6, Dubna, Russia |
| Abstract: | Fission cross-section measurements with the Fast Ionization Chamber (FIC) at the CERN n_TOF facility were challenged by intense signals due to γ-rays and ultra-relativistic particles from the impact of the 20 GeV proton pulses on the neutron spallation target. A method for analyzing the data taken with Flash Analog to Digital Converters (FADC) was developed to treat these problems in an automated way to provide a reliable background subtraction and a fit routine for identifying fission events even at high energies. The analysis is illustrated at the example of the fission cross-section of 238U relative to that of 235U in the energy range from 40 keV to 300 MeV. |
| Keywords: | Pulse shape analysis Digital signal processing Neutron induced fission Fission ionization chamber Neutron time of flight n_TOF |
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