Abstract
Neutron decay of the isoscalar giant dipole resonance (ISGDR) has been studied in90Zr ,116Sn and208Pb using the (α,α′) reaction at a bombarding energy of 200 MeV. The same reaction was used to study proton decay of the ISGDR in58Ni and208Pb . Neutron and proton decay of the ISGDR to low-lying neutron and proton hole states in the daughter nuclei, respectively, allowed an experimental determination of the ISGDR microscopic structures. The determined branching ratios are compared to recent continuum random-phase-approximation (CRPA) calculations. Reasonable agreement was observed for208Pb and58Ni , whereas strong differences for90Zr and116Sn were found.
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