Abstract
The prompt neutron emission in thermal neutron induced fission of 235 U has been investigated applying digital signal electronics. The goal was to compare the results of this digital data acquisition and digital signal processing analysis to the results of the pioneering work of Apalin et al. Using a twin Frisch grid ionization chamber for the fission fragment detection and a NE213 equivalent neutron detector in total about 10 6 neutron coincidences have been registered. The fission fragment kinetic energy, mass and angular distribution has been investigated along with prompt neutron time of flight and pulse shape using a six channel synchronous waveform digitizer with sampling frequency of 250 MHz and 12 bit resolution. The signals have been analyzed using digital pulse processing algorithms, developed by authors. The thermal neutron beam was transported from the IBR-2 reactor to the target with bent mirror neutron guide.
Highlights
The nuclear fission is considered as the process of charged drop evolution under competition between attractive nuclear and repulsing coulomb forces, leading eventually to the split of the nucleus mainly into two parts of comparable masses
The main part of fission fragments (FF) excitation energy is released by the prompt fission neutrons (PFN), emitted by FF after full acceleration by coulomb forces
The studies of PFN emission in fission induced by neutrons from energies extending from resonances up to a few MeV would contribute to better understanding the mechanism of PFN emission from the excited FF
Summary
The nuclear fission is considered as the process of charged drop evolution under competition between attractive nuclear and repulsing coulomb forces, leading eventually to the split of the nucleus mainly into two parts of comparable masses. The main part of fission fragments (FF) excitation energy is released by the prompt fission neutrons (PFN), emitted by FF after full acceleration by coulomb forces. The need of further systematic studies of correlations between fragment and neutron characteristics is clear. The studies of PFN emission in fission induced by neutrons from energies extending from resonances up to a few MeV would contribute to better understanding the mechanism of PFN emission from the excited FF. The experiments on sub-barrier fission, induced by thermal neutrons are of particular interest because of no measurements was done so far on mass and energy distributions for this systems [2]. In this work we report preliminary results of PFN investigation thermal neutron-induced fission of 235U. The first goal of the experiment was the feasibility check of the apparatus and data analysis procedure
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