A method for determining the intensity of concomitant neutron source D(d, n)3He when studying the characteristics of delayed neutrons from nuclear fission induced by neutrons from reaction T(d, n)4He

Development of a Reference Database for Beta-Delayed Neutron Emission

“…The observed discrepancies were largely attributable to the uncertainties in the delayed neutron data used in these calculations. Their effort to address this included international benchmark measurements of the effective delayed neutron fraction, made on fast critical assemblies, which aimed to provide high-quality experimental information for 235 U, 238 U, and 239 Pu.…”

“…Another advantage of this method as compared to the nuclear reactor neutron-source techniques is a minimum of scattering and thermalizing material present in the vicinity of the sample. The total delayed-neutron yield was measured from the fission of 232 Th, 233 U, 235 U, 238 U, and 239 Pu [217] nuclides. Later, Krick and Evans [218], using the same methodology, measured the total delayed-neutron yield as a function of the neutron energy from the fission of 233 U, 235 U, 238 U, 239 Pu, and 242 Pu in the energy range 0.1 -6.5 MeV.…”

“…This feature of the T(d,n) 4 He reaction makes it difficult to interpret the experimental data obtained in the respective experiments. A special method has been developed to measure the intensity of the D(d,n) 3 He neutron source in correlation with the ion charge accumulated on a tritium target [238]. This method allows one to account for the effect of the concomitant neutron source and has been used in measurements of the relative abundances and periods of delayed neutrons for neutron-induced fission of 232 Th, 233 U, 235 U, 236 U, 238 U, 239 Pu, 237 Np, and 241 Am in the energy range from 14 to 18 MeV.…”

“…This method allows one to account for the effect of the concomitant neutron source and has been used in measurements of the relative abundances and periods of delayed neutrons for neutron-induced fission of 232 Th, 233 U, 235 U, 236 U, 238 U, 239 Pu, 237 Np, and 241 Am in the energy range from 14 to 18 MeV. Details of the procedure are presented in ( [238], [239]).…”

“…In addition, the integral energy spectra of delayed neutrons from thermal neutron-induced fission of 235 U have been measured [243]. The relative abundances and half-lives of delayed neutrons from the relativistic proton-induced fission of 238 U have also been measured [247]. All the data related to neutron-induced fission have been compiled in the macroscopic section of the database developed by this CRP [40] under the guidance of the Nuclear Data Section.…”