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Evidence for long formation times of near-barrier fusion reactions

M. ThoennessenDepartment of Chemistry, Washington University, St. Louis, Missori, 63130J. R. BeeneDepartment of Chemistry, Washington University, St. Louis, Missori, 63130F. E. BertrandDepartment of Chemistry, Washington University, St. Louis, Missori, 63130C. BaktashDepartment of Chemistry, Washington University, St. Louis, Missori, 63130M. L. HalbertDepartment of Chemistry, Washington University, St. Louis, Missori, 63130D. J. HorenDepartment of Chemistry, Washington University, St. Louis, Missori, 63130D. G. SarantitiesDepartment of Chemistry, Washington University, St. Louis, Missori, 63130W. SpangDepartment of Chemistry, Washington University, St. Louis, Missori, 63130D. W. StracenerDepartment of Chemistry, Washington University, St. Louis, Missori, 63130

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Annotatsiya

High energy \ensuremath{\gamma} rays from the decay of the giant dipole resonance built on highly excited states in $^{164}\mathrm{Yb}$ at ${\mathit{E}}_{\mathrm{ex}}$=49 MeV formed in two different reactions have been measured. While standard statistical model calculations can describe the \ensuremath{\gamma}-ray spectrum from the $^{16}\mathrm{O}$ + $^{148}\mathrm{Sm}$ reaction they fail to reproduce the \ensuremath{\gamma}-ray spectra from the more symmetric reaction $^{64}\mathrm{Ni}$ + $^{100}\mathrm{Mo}$. Simple model calculations which include particle evaporation and \ensuremath{\gamma}-ray decay during the formation process suggest that the observed differences may be related to a long fusion time in the more symmetric reaction.

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DOI: 10.1103/physrevlett.70.4055

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