Abstract
The direct particle decay of the isoscalar giant dipole resonance (ISGDR) has been studied in208Pb using the (α, α′p) and (α, α′n) reactions at a bombarding energy of 200 MeV. The direct-decay channels of proton and neutron emissions were observed in coincidence with the scattered α-particles in order to study the population of proton-hole states in207T1 and neutron-hole states in207Pb. The results of the partial and total branching ratios allowed us to test recently performed continuum-RPA (CRPA) calculations for the ISGDR and thereby to learn about its microscopic structure.
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