The giant dipole resonance in ²²⁴Th excited to 44, 64, and 82 MeV was observed following the fusion of ¹⁶O+²⁰⁸Pb. The total γ spectrum is analyzed in terms of prefission and postfission γ decay. The data can only be fitted by our requiring an enhancement of the giant-dipole-resonance γ rays from the prefission nuclei which is explained by a large fission hindrance in the early decay steps from the compound system. A measurement of the γ-fission angular correlation supports this conclusion and establishes a deformed shape of the compound nucleus.
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Thoennessen et al. (1987) studied this question.
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