Abstract
Total fission kinetic energies E/sub K/ have been measured as a function of excitation energy in the /sup 240/Pu nucleus excited in the /sup 241/Pu(/sup 3/He,..cap alpha..) reaction. A small negative slope of dE/sub K//dE* approx. = -0.05 is observed in the excitation energy region E*=5--9 MeV. This is substantially smaller than the slope of dE/sub K//dE*=-1.1 observed in the /sup 240/Pu(..cap alpha..,..cap alpha..'f ) reaction and slightly smaller than the slope of dE/sub K//dE* approx. = -0.35 obtained from (d,pf ) and neutron capture reactions. It is concluded that the primary reaction mechanism plays a decisive role for the total kinetic energy release at near barrier energies but that the angular momentum transfer is not the important parameter. The data are discussed in terms of a simple scission-point model, and in particular the effect of the Z=50, N=82 spherical doubly magic shell in the nascent fragments.
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