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- W2023409706 abstract "Neutron multiplicities after antiproton-induced fission have been determined as a function of the total mass of the fission fragments. Pre- and postscission neutron multiplicities of the reaction $mathrm{pifmmodebarelsetextasciimacronfi{}}$+${}^{238}$U have been deduced using the moving-source parametrization of the neutron energy spectra by Maxwellian distributions. A postscission multiplicity of 6.3(6) neutrons out of 20.0(10) in total emitted neutrons in fission indicates that fission is a rather slow process. The increase of the evaporative prescission neutron multiplicity is about 80% of the total increase of evaporative neutrons as a measure of excitation energy. The postscission multiplicity gets only 20% of the total increase, thus indicating that the nucleus has only a moderate excitation energy at the moment of scission. The results are compared with standard cascade-evaporation calculations predicting a much lower number of evaporated prescission neutrons as the experiment shows. This is a strong indication of the importance of dissipative effects in the fission process. Application of dissipative effects like a saddle-to-scission delay time and nuclear viscosity in the model calculation describes the experimental results much better." @default.
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- W2023409706 date "1997-06-01" @default.
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- W2023409706 title "Neutrons in coincidence with fission of238U induced by stopped antiprotons" @default.
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- W2023409706 doi "https://doi.org/10.1103/physrevc.55.2965" @default.
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