Abstract
Experimental data on the fission of even-even compound nuclei in the reactions (d,pf), (γ,f) and (n,f) close to threshold are analysed and estimates of the fission widths are made on the basis of the Bohr-Wheeler formula. All the experimental data are in agreement with the fission channel structure proposed by A. Bohr. It is found that fission channels with negative parity lie 0·6−0·8 MeV higher than the first channels with positive parity. For this ordering of the fission channels, the Bohr-Wheeler formula gives a quantitatively correct description of the average fission widths of the resonances observed in the (n,f) reaction with 233U, 115U and 241Pu. To explain a sharp discrepancy in the case Of 239Pu, it is necessary to suppose that the ground state of this nucleus has negative parity.
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