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The Coulomb effects hypothesis is used to interpret even-odd effects ofmaximum total kinetic energy as a function of mass and charge of fragments fromthermal neutron induced fission of 235U. Assuming spherical fragments atscission, the Coulomb interaction energy between fragments (C_sph) is higherthan the Q-value, the available energy. Therefore at scission the fragmentsmust be deformed, so that the Coulomb interaction energy does not exceed theQ-value. The fact that the even-odd effects in the maximum total kinetic energyas a function of the charge and mass, respectively, are lower than the even-oddeffects of Q is consistent with the assumption that odd mass fragments aresofter than the even-even fragments. Even-odd effects of charge distribution insuper asymmetric fragmentation also are interpreted with the Coulomb effecthypothesis. Because the difference between C_sph and Q increases withasymmetry, fragmentations require higher total deformation energy to occur.Higher deformation energy of the fragments implies lower free energy to breakpairs of nucleons. This explains why in the asymmetric fragmentation region,the even-odd effects of the distribution of proton number and neutron numberincreases with asymmetry. Based on a similar reasoning, a prediction of arelatively high even-odd effect in symmetric fragmentations is proposed.

Coulomb and even-odd effects in cold and super-asymmetric fragmentation for thermal neutron induced fission of 235U