Parameterization of prompt neutron multiplicity for first-chance actinide photofission

Volume 9, Issue 1, February 2024     |     PP. 470-487      |     PDF (3288 K)    |     Pub. Date: September 6, 2023
DOI: 10.54647/physics140574    56 Downloads     1065 Views  

Author(s)

Eugene V. Oleinikov, Institute of Electron Physics, Universitetska str., 21, 88017 Uzhhorod, Ukraine
Alexander I. Lengyel, Institute of Electron Physics, Universitetska str., 21, 88017 Uzhhorod, Ukraine
Oleg O. Parlag, Institute of Electron Physics, Universitetska str., 21, 88017 Uzhhorod, Ukraine
Volodymyr T. Maslyuk, Institute of Electron Physics, Universitetska str., 21, 88017 Uzhhorod, Ukraine
Igor V. Pylypchynets, Institute of Electron Physics, Universitetska str., 21, 88017 Uzhhorod, Ukraine

Abstract
A parametric description of the dependence of the average number of prompt neutrons on the mass of fragments ν(A) from the actinides ( 235U and 238U) photofission has been developed for the range of energies of the first chance of fission (from thresholds of (γ,f) reaction to thresholds of (γ,nf) reactions). The proposed method gives a possibility to describe the dependence of "saw-tooth" behavior of prompt neutron yield from fission fragments, using several free parameters dependent on the energy and composition of nucleons, and to predict ν(A) for other isotopes of actinides. The phenomenological Wahl method was applied to estimate the number of neutrons emitted by corresponding fission fragments of atomic mass A. The total averaged number of prompt neutrons needs to construct the parametrizing function, which reasonably reproduces the characteristic features of its behavior and parameterization of an average number of prompt neutrons. To verify the proposed parametrization, according to the established fact of the equivalence of the formation of identical compound nuclei caused by reactions stimulated by photons and neutrons, calculations were carried out for the compound nuclei 234U*, 236U*, 238Np*, 240Pu*, formed as a result of neutron fission reactions for which the experimental data is present. The results of the calculations obtained by the parametric formula of the dependence of the neutron yield on the fragment mass for the indicated fissile nuclei are consistent with experimental data within the error limits. It should be noted that the dependence values of the prompt neutron yield on the light and heavy fragments of photofission for the specified actinides, obtained as a result of calculations using the parametric formula, and additionally carried out simulations with the codes GEF, TALYS, qualitatively agree with each other and reflect the structure, characteristic of the available experimental data of actinoid fission.

Keywords
photofission, total average prompt neutron yield, number of neutrons from fission fragments, separation energy, Wahl method, Talys, GEF

Cite this paper
Eugene V. Oleinikov, Alexander I. Lengyel, Oleg O. Parlag, Volodymyr T. Maslyuk, Igor V. Pylypchynets, Parameterization of prompt neutron multiplicity for first-chance actinide photofission , SCIREA Journal of Physics. Volume 9, Issue 1, February 2024 | PP. 470-487. 10.54647/physics140574

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