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Analyses using simplified coupled-channels models have been unable todescribe the shape of the previously measured fusion barrier distribution forthe doubly magic $^{16}$O+$^{208}$Pb system. This problem was investigated byre-measuring the fission excitation function for $^{16}$O+$^{208}$Pb withimproved accuracy and performing more exact coupled-channels calculations,avoiding the constant-coupling and first-order coupling approximations oftenused in simplified analyses. Couplings to the single- and 2-phonon states of$^{208}$Pb, correctly taking into account the excitation energy and the phononcharacter of these states, particle transfers, and the effects of varying thediffuseness of the nuclear potential, were all explored. However, in contrastto other recent analyses of precise fusion data, no satisfactory simultaneousdescription of the shape of the experimental barrier distribution and thefusion cross-sections for $^{16}$O+$^{208}$Pb was obtained.Comment: RevTex, 29 pages, 7 postscript figures, to appear in PR

physical review. c. nuclear physics/physical review. c, nuclear physics

Coupled-channels analysis of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>16</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">O</mml:mi><mml:mrow><mml:msup><mml:mrow><mml:mo>+</mml:mo></mml:mrow><mml:mrow><mml:mn>208</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Pb</mml:mi></mml:math>fusion barrier distribution

Coupled-channels analysis of the16O+208Pbfusion barrier distribution