Complete fusion of ${}^9$Be with spherical targets

Abstract

The complete fusion of ${}^9$Be with ${}^{144}$Sm and ${}^{208}$Pb targets is calculated in the coupled-channels approach. The calculations include couplings between the 3/2${}^{-}$, 5/2${}^{-}$, and 7/2${}^{-}$ states in the $K=3/2$ ground state rotational band of ${}^9$Be. It is shown that the $B(E2)$ values for the excitation of these states are accurately described in the rotor model. The interaction of the strongly deformed ${}^9$Be nucleus with a spherical target is calculated using the double-folding technique and the effective M3Y interaction, which is supplemented with a repulsive term that is adjusted to optimize the fit to the data for the ${}^{144}$Sm target. The complete fusion is described by in-going-wave boundary conditions. The decay of the unbound excited states in ${}^9$Be is considered explicitly in the calculations by using complex excitation energies. The model gives an excellent account of the complete fusion (CF) data for ${}^9$Be+${}^{144}$Sm, and the cross sections for the decay of the excited states are in surprisingly good agreement with the incomplete fusion (ICF) data. Similar calculations for ${}^9$Be+${}^{208}$Pb explain the total fusion data at high energies but fail to explain the CF data, which are suppressed by 20%, and the calculated cross section for the decay of excited states is a factor of three smaller than the ICF data at high energies. Possible reasons for these discrepancies are discussed.

References in corpus (3)

• Signature of Shallow Potentials in Deep Sub-barrier Fusion Reactions
• Neutron density distributions from antiprotonic 208Pb and 209Bi atoms
• Hindrance of ^{16}O+^{208}Pb fusion at extreme sub-barrier energies