Elsevier

Nuclear Physics A

Volume 382, Issue 1, 28 June 1982, Pages 71-78
Nuclear Physics A

Study of the 208Pb(n, γ0)209Pb reaction between 0.8 and 7.7 MeV

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Abstract

The reaction 208Pb(n, γ0)209Pb was studied from 0.8 to 7.7 MeV to investigate relative contributions of the compound-nucleus and direct and semidirect processes in this energy range. Compound-nucleus reactions dominate below about 5 MeV and semidirect processes above 6 MeV. The direct-semidirect (DSD) model with a complex particle-vibration coupling describes the experimental data in the giant resonance region. A relatively large imaginary term is necessary to obtain a good fit to the data indicating either that the reactions proceed to a large extent in more complicated ways than the simple two-step semidirect reaction or that the model has a serious defect in its present formulation. A second objective was to search for a possible excitation of the isoscalar E2 and the M1 giant resonances by measuring asymmetries around 90° in the angular distribution of the γ-rays. The results indicate no (or very weak) asymmetry effects.

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Los Alamos National Laboratory, Los Alamos, NM, USA.

∗∗

University of Lund, Lund, Sweden.

∗∗∗

University of Oregon, Eugene, OR, USA.

∗∗∗

Studsvik Science Laboratory, Nyköping, Sweden.

∗∗∗∗∗

Pakistan Institute of Nuclear Science and Technology, Rawalpindi, Pakistan.

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