Gennadiy Vlaskin - Academia.edu (original) (raw)
Papers by Gennadiy Vlaskin
EPJ Web of Conferences, 2017
The code NEDIS allows the calculation of neutron production rate and continuous energy spectra du... more The code NEDIS allows the calculation of neutron production rate and continuous energy spectra due to (α,n)
EPJ Web of Conferences
Neutron production yields and energy distributions from (D,n) reactions in light elements were ca... more Neutron production yields and energy distributions from (D,n) reactions in light elements were calculated using three different codes (SOURCES, NEDIS and USD) and compared with the existing experimental data in the 3.5-10 MeV alpha energy range. SOURCES and NEDIS display an agreement between calculated and measured yields in the decay series of 235 U, 238 U and 232 Th within r10% for most materials. The discrepancy increases with alpha energy but still an agreement of r20% applies to all materials with reliable elemental production yields (the few exceptions are identified). The calculated neutron energy distributions describe the experimental data, with NEDIS retrieving very well the detailed features. USD generally underestimates the measured yields, in particular for compounds with heavy elements and/or at high alpha energies. The energy distributions exhibit sharp peaks that do not match the observations. These findings may be caused by a poor accounting of the alpha particle energy loss by the code. A big variability was found among the calculated neutron production yields for alphas from Sm decay; the lack of yield measurements for low (~2 MeV) alphas does not allow to conclude on the codes' accuracy in this energy region.
Accurate data on the neutron yield from the interaction of α-particles with the nuclei of light e... more Accurate data on the neutron yield from the interaction of α-particles with the nuclei of light elements ranging from lithium to potassium are required for solving the problems of nuclear power technologies: development of analytical means for controlling the technological processes of fabricating and reprocessing nuclear fuel, securing radiological protection for workers, improving the systems for managing and monitoring nuclear materials and radioactive wastes, measuring the burnup fraction of spent nuclear fuel, and others. The uncertainty of this information must be <10% for energies ranging from 4 to 9 MeV of α-particles emitted by naturally occurring and artificial radionuclides. The computational uncertainty of the neutron yield can be reduced on the basis of a combined analysis of (α, n) reactions, measured on α-particle accelerators with tunable energy and on compounds of actinides with light elements, using reliable data on the stopping power of α-particles for elements from hydrogen to californium. The results of such an analysis based on experimental and evaluated data for the light isotopes 41 K in the α-particle energy range from 4 to 9 MeV are presented.
The code NEDIS allows the calculation of neutron production rate and continuous energy spectra du... more The code NEDIS allows the calculation of neutron production rate and continuous energy spectra due to (α,n) reaction on Li,. It accounts for anisotropic angular distribution of neutrons of (α,n) reaction in centre-of-mass system and dimensions of alpha emitting source material particles. Spontaneous fission spectra are calculated with evaluated half-life, spontaneous fission branching, ν-averaged per fission, and Watt spectrum parameters. The results of calculations by NEDIS can be used as input for Monte Carlo simulation for materials that will be used in radiation shielding and for underground neutron experiments
EPJ Web of Conferences, 2017
The code NEDIS allows the calculation of neutron production rate and continuous energy spectra du... more The code NEDIS allows the calculation of neutron production rate and continuous energy spectra due to (α,n)
EPJ Web of Conferences
Neutron production yields and energy distributions from (D,n) reactions in light elements were ca... more Neutron production yields and energy distributions from (D,n) reactions in light elements were calculated using three different codes (SOURCES, NEDIS and USD) and compared with the existing experimental data in the 3.5-10 MeV alpha energy range. SOURCES and NEDIS display an agreement between calculated and measured yields in the decay series of 235 U, 238 U and 232 Th within r10% for most materials. The discrepancy increases with alpha energy but still an agreement of r20% applies to all materials with reliable elemental production yields (the few exceptions are identified). The calculated neutron energy distributions describe the experimental data, with NEDIS retrieving very well the detailed features. USD generally underestimates the measured yields, in particular for compounds with heavy elements and/or at high alpha energies. The energy distributions exhibit sharp peaks that do not match the observations. These findings may be caused by a poor accounting of the alpha particle energy loss by the code. A big variability was found among the calculated neutron production yields for alphas from Sm decay; the lack of yield measurements for low (~2 MeV) alphas does not allow to conclude on the codes' accuracy in this energy region.
Accurate data on the neutron yield from the interaction of α-particles with the nuclei of light e... more Accurate data on the neutron yield from the interaction of α-particles with the nuclei of light elements ranging from lithium to potassium are required for solving the problems of nuclear power technologies: development of analytical means for controlling the technological processes of fabricating and reprocessing nuclear fuel, securing radiological protection for workers, improving the systems for managing and monitoring nuclear materials and radioactive wastes, measuring the burnup fraction of spent nuclear fuel, and others. The uncertainty of this information must be <10% for energies ranging from 4 to 9 MeV of α-particles emitted by naturally occurring and artificial radionuclides. The computational uncertainty of the neutron yield can be reduced on the basis of a combined analysis of (α, n) reactions, measured on α-particle accelerators with tunable energy and on compounds of actinides with light elements, using reliable data on the stopping power of α-particles for elements from hydrogen to californium. The results of such an analysis based on experimental and evaluated data for the light isotopes 41 K in the α-particle energy range from 4 to 9 MeV are presented.
The code NEDIS allows the calculation of neutron production rate and continuous energy spectra du... more The code NEDIS allows the calculation of neutron production rate and continuous energy spectra due to (α,n) reaction on Li,. It accounts for anisotropic angular distribution of neutrons of (α,n) reaction in centre-of-mass system and dimensions of alpha emitting source material particles. Spontaneous fission spectra are calculated with evaluated half-life, spontaneous fission branching, ν-averaged per fission, and Watt spectrum parameters. The results of calculations by NEDIS can be used as input for Monte Carlo simulation for materials that will be used in radiation shielding and for underground neutron experiments