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Abstract
Angular distributions of fission fragments from the neutron-induced fission of 232 Th, 233 U, 235 U, 238 U and 209 Bi have been measured in the energy range 1–200 MeV at the neutron TOF spectrometer GNEIS based on the spallation neutron source at 1 GeV proton synchrocyclotron of the PNPI (Gatchina, Russia). The multiwire proportional counters have been used as a position sensitive fission fragment detector. A description of the experimental equipment and measurement procedure is given. The anisotropy of fission fragments deduced from the data on measured angular distributions is presented in comparison with experimental data of other authors, first of all, the recent data from WNR at LANSCE (Los Alamos, USA) and n_TOF(CERN).
Highlights
Angular distributions of fission fragments arise due to two factors
The data on nuclear fission in this intermediate energy range are of prime importance for the advanced nuclear technologies such as Accelerator-Driven Systems
The fission fragment registration was performed by two coordinates sensitive multiwire proportional counters (MWPC) 140 × 140 mm2 of size
Summary
Angular distributions of fission fragments arise due to two factors. The angular distribution of fragments from neutron-induced fission at the energies up to 200 MeV may shed some light on these questions. In this article preliminary experimental data on angular distribution of fragments from fission of target nuclei 232Th, 233U, 235U, 238U and 209Bi by neutrons with energies 1–200 MeV are presented. The fission fragment registration was performed by two coordinates sensitive multiwire proportional counters (MWPC) 140 × 140 mm of size. A value of cos(θ ), where θ is an angle between neutron beam axis and fission fragment momentum, can be derived from the coordinates of the fission fragment measured by two counters. Time and pulseheight analysis of the signal waveforms allowed to derive the neutron energy and the fission fragment coordinates on the MWPCs, and, the angle information
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