Abstract
The experimental values of total radiative widths,lt;√ɣgt;, for 208 nuclides (Z=11−98, A=23−249) are compiled and analysed. Two empirical formulas are presented for the radiative widths, which are dependent on the atomic number Z, the mass number A and the neutron separation energy Sn of the compound nucleus:lt;√ɣ0gt; =31 Z−2.5 A0.56 Sn0.83 (in eV) and lt;√ɣ1gt; =24 Z1.3 A−2.6 Sn0.95 (in eV). Using the strong-coupling dipole model, the coupling coefficients Cr which are varied smooth with the mass numbers A are obtained. Some maxima of Cr around the magic numbers are obtained. This is an evidence of the shell effect for Cr. It is found that Cr of the odd neutron nuclides generally are larger than those of the even neutron nuclides. This is due to the pairing effect.
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