Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
1999-07-06
Phys.Rev. C60 (1999) 044608
Physics
Nuclear Physics
Nuclear Experiment
RevTex, 29 pages, 7 postscript figures, to appear in PRC
Scientific paper
10.1103/PhysRevC.60.044608
Analyses using simplified coupled-channels models have been unable to describe the shape of the previously measured fusion barrier distribution for the doubly magic $^{16}$O+$^{208}$Pb system. This problem was investigated by re-measuring the fission excitation function for $^{16}$O+$^{208}$Pb with improved accuracy and performing more exact coupled-channels calculations, avoiding the constant-coupling and first-order coupling approximations often used in simplified analyses. Couplings to the single- and 2-phonon states of $^{208}$Pb, correctly taking into account the excitation energy and the phonon character of these states, particle transfers, and the effects of varying the diffuseness of the nuclear potential, were all explored. However, in contrast to other recent analyses of precise fusion data, no satisfactory simultaneous description of the shape of the experimental barrier distribution and the fusion cross-sections for $^{16}$O+$^{208}$Pb was obtained.
Berriman A. C.
Dasgupta Mahananda
Hagino Kouichi
Hinde D. J.
Morton C. R.
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