The $n$ decay of the giant resonance region between 8.5 and 12.5 MeV in ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$ has been studied in an ($\alpha$,${\alpha }^{\prime }n$) coincidence experiment at $E_x=104\mathrm{}$ MeV. The energy resolution was sufficient to observe the decay into the different states of ${}_{}{}^{207}{}_{}{}^{}\mathrm{Pb}$ separately. The strong population of the ${\frac{13}{2}}^{+}$ state shows that large contributions of the total strength excited in the giant quadrupole resonance region have multipolarities ≥ 4. The $\alpha$ spectra coincident with the decay neutrons show fine structures in the giant quadrupole resonance region of ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$.

• Received 12 June 1981

DOI:https://doi.org/10.1103/PhysRevLett.47.1702