Isoscaling and fission modes in the yields of the Kr and Xe isotopes from photofission of actinides

Understanding the isoscaling relationship in the fissioning system with evaluated data *

“…, as in Ref. [11]. In more detail, the values monotonically increase from 0.41 to 0.7 with z increasing from 30 to 38, and from 0.5 to 0.94 in the range of .…”

“…The isoscaling parameter of the binary fission of n (14 MeV)+ U systems, which were obtained from the evaluated independent fragment yields, has been reported in Ref. [11]. Their studies show that the isoscaling parameter increases with the fission fragment proton number z, except in the region of where the decreases with z.…”

“…When the symmetry energy plays a dominant role in the isotopic distributions, the isoscaling parameter increases with the charge number of the fragment, i.e., z. However, the shell corrections are also important for describing the fissioning system, and it leads the deviation from a smooth linear n dependence of appears [10,11]. Thus, the values exhibit significant uncertainties in certain region.…”

“…Veselsky . examined the isoscaling parameter of the independent fission fragment yields from the evaluated nuclear data file ENDF-349 for the binary fission of U targets induced by 14 MeV neutrons and the spontaneous fission of Cm to understand the fission dynamics around the scission point [11]. The importance of the shell closure is verified again, but the behaviors of the intrinsic temperature of the fission fragment are less discussed.…”

The features of the fission fragments yields formation of the actinide nuclei on example of uranium isotopes

“…It is known that Kr isotopes are important markers for the study of nuclear fission materials, so examining their features is important [22,23]. As seen from the figure, with increasing atomic mass of the fissile isotope of uranium, Kr spectra are shifted to the range of the neutron-rich nuclei and contain unstable fission fragments.…”