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The fragment yield ratios were investigated in the fission of 238,233Utargets induced by 14 MeV neutrons. The isoscaling behavior was typicallyobserved for the isotopic chains of fragments ranging from the proton-rich tothe most neutron-rich ones. The observed high sensitivity of neutron-rich heavyfragments to the target neutron content suggests fission as a source ofneutron-rich heavy nuclei for present and future rare ion beam facilities,allowing studies of nuclear properties towards the neutron drip-line andinvestigations of the conditions for nucleosynthesis of heavy nuclei. Thebreakdowns of the isoscaling behavior around N=62 and N=80 manifest the effectof two shell closures on the dynamics of scission. The shell closure aroundN=64 can be explained by the deformed shell. The investigation of isoscaling inthe spontaneous fission of 248,244Cm further supports such conclusion. TheZ-dependence of the isoscaling parameter exhibits a structure which can bepossibly related to details of scission dynamics. The fission isoscalingstudies can be a suitable tool for the investigation of possible new pathwaysto synthesize still heavier nuclei.Comment: 7 pages, 3 figures, RevTex, final version, to appear in Phys. Rev. C  as a regular articl

Isoscaling studies of fission: A sensitive probe into the dynamics of scission