Abstract:
The giant dipole resonance region of 209Pb has been studied via the reaction 208Pb(n, γ) for transitions leading to the ground and first excited states of 209Pb. Measured angular distributions were used to extract a2 coefficients at 8 energies and a1 coefficients at 4 energies between 10 and 13 MeV. The results are compared to direct-semidirect model and pure resonance model calculations using both real and complex form factors. Absolute cross sections at 90° were measured in 200 keV steps from En(Ex) = 7.0(10.9) MeV to 13.0(16.9) MeV and are compared to previous data and to DSD and PRM calculations. The transitions to the ground and first excited states exhaust 0.39 % and 0.13 % of the classical dipole sum, respectively, between the excitation energies of 10.9 and 16.9 MeV. © 1982.
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