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Binary structure in time distributions of fission fragments in 13-MeV proton-induced fission of 232Th.

In the proton-induced fission of {sup 232}Th, a binary structure was observed in the velocity and the total-kinetic-energy distributions of fission fragments with {ital A}=128--131. From the present results, it is concluded that there are at least two kinds of scission configurations: elongated shapes probably associated with the symmetric liquid-drop path, and more compact shapes associated with the asymmetric shell-influenced path.