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The {\ell}-summed Wong expression is applied in the semiclassical extendedThomas Fermi (ETF) method of Skyrme energy density formalism (SEDF), using boththe sudden and frozen-density approximations, to the case of 64Ni+64Ni reactiondata. We find that a very much improved fit (almost exact, point to point) tothe data is obtained for the frozen-density approximation with {\ell}max(Ec.m.) varying smoothly. On the other hand, the same could not be achieved inthe sudden case, still requiring a modification of the barrier at both thebelow- and above-barrier energies. This result means to say that the phenomenonof hindrance, observed in coupled channel calculations for 64Ni+64Ni reaction,could be explained simply on the basis of the {\ell}-summed Wong expression, atleast for the frozen-density approximation in ETF method of SEDF.

Sudden- or Frozen-density approximation in Semi-classical extended Thomas Fermi model for Wong formula used in 64Ni+64Ni reaction