Variation of even-odd proton effects with excitation energy in fission of 252Cf: Confirmation of fine structure in ν(A)

The existence of even-odd proton effects (fine structure) in ν(A) of individual fragments from 252Cf(sf) has been confirmed by analysis of previously reported data. The fine structure is seen to increase in amplitude as the fragment excitation energy decreases, a behaviour similar to the well-known behaviour of the mass yield curve. The present mass yield data also show these effects, as expected. Conversely, our total kinetic energy data TKE(A), not previously reported, show very little even-odd proton effect. It is shown that energy balance considerations, also, support the existence of even-odd proton effects in neutron emission from 252Cf(sf). (orig.)