Fission-fragment total kinetic energy and mass yields for neutron-induced fission of ²³⁵U and ²³⁸U with E_n =200 keV – 30 MeV

Abstract

Abstract. The average Total Kinetic Energy (T K E) release and fission-fragment yields in neutron-induced fission of 235 U and 238 U was measured using a Frisch-gridded ionization chamber. These observables are important nuclear data quantites that are relevant to applications and for informing the next generation of fission models. The measurements were performed a the Los Alamos Neutron Science Center and cover E n = 200 keV -30 MeV. The double-energy (2E) method was used to determine the fission-fragment yields and two methods of correcting for prompt-neutron emission were explored. The results of this study are correlated mass and T K E data.

Total kinetic energy release in the fast neutron induced fission of actinide nuclei

“…Let's pick "representative" values of the neutron energy like 10 and 20 MeV. Extrapolating in Figure 4, we deduce measured values of the TKE of 161, 166.5, 170, and 173.5 MeV for the case of E n = 10 MeV for the fast neutron induced fission of 232 Th, 235 U, 237 Np, and 239 Pu and 160.5, 165, 167.5, and ), the ENDF model (ENDF) [42] and the semiempirical JEFF 3.3 [45] and GEF [26] models.…”

“…FIGURE 5 Comparison of the measured values of the mass distributions for the 240 Pu (n,f) reaction with previous measurements (Winkelmann et al [41]), the ENDF model (ENDF)[42] and the semiempirical JEFF 3.3[45] and GEF[26] models.…”

“…Measured fission mass distributions for 242 Pu(n,f) reaction and comparisons with previous work (Nethaway [44]), ENDF [42] estimates and calculations of the GEF [26] and JEFF [45] codes.…”

Kinetic energy distribution for neutron-induced fission of neptunium isotopes

“…On the other hand, the determination of kinetic energy leads to a better understanding of the fission process, of reprocessing methods for spent nuclear fuel, and of the odd-even effect. However, the kinetic energy of neptunium isotopes has been measured in only a few works [16][17][18] and there are limited experimental data available on the <TKE> distributions (the mean total kinetic energy as a function of fission fragments) for actinide fission [19][20][21][22][23][24][25][26][27][28][29][30]. It therefore seems necessary to explore the <TKE> values of neptunium isotopes.…”