Mass and nuclear charge yields for 237Np(2nth,f) at different fission fragment kinetic energies

Isotopic fission-fragment distributions of U238, Np239, Pu240Ramos1, Caamaño2, Farget3 et al. 2018Phys. Rev. C405150View full textAdd to dashboardCite

“…The previous measurement of 237 Np(2n th ,f ) from Ref. [35] shows an excellent agreement with the present data, indicating that light fragments remain insensitive to the small E x difference between the two measurements, with E x = 7.5 MeV and E x = 6.2 MeV, respectively.…”

“…Concerning 239 Np (Fig. 12), the present experiment expands the available experimental data to the full distribution, whereas only light fragments were previously measured [35,36]. The previous measurement of 237 Np(2n th ,f ) from Ref.…”

“…Fission-fragment mass yields. Present data are compared with previous data in different energy ranges [6,9,13,29,30,35,47,48]. The corresponding E x are indicated in parentheses.…”

15 Fission Fragment Mass, Charge and Energy Distributions

“…e) Proton odd-even effect in the fission of nuclides with odd Ζ A priori one would not expect proton odd-even factors in the fission of odd-Z nuclei, as in these cases an odd-Z fragment is always formed simultaneously with an even-Z fragment. In the high yield regions of the neutron induced fission of 238 Np indeed such factors were not observed [90,103], see also Gönnenwein [3]. However, in the very asymmetric fission of 242m + g Am a local odd-even factor for protons was observed [104] amounting to 15 ± 3% at Ζ = 32.5 and 17 + 3% at Ζ = 31.5.…”

“…AA, σ(Α), ΔΖ(140), σ(Ζ), s, EOZ and EON) on the nuclear charge and mass of the fissioning nuclei and on the number of prompt neutrons emitted in the corresponding fission reaction. This has been accomplished by using additional experimental yield information that has become available on the following fission reactions from different sources: 232 Th(n R ,f), 238 U(n R ,f), 238 U(n H ,f), and 241 Pu(n th ,f) [87] where the index of η stands for thermal-(th), reactor-(R), and 14 MeV-neutrons (H) and even more recently [88] on the thermal neutron induced fission of 229 Th [89], 238 Np [90], and 249 Cf [91].…”