Bohr-Weisskopf Effect

I85,i87j g74+ j32]. There is thus renewed interest in the analysis of the so-called Bohr-Weisskopf effect [17,18], calling for an improved theoretical description of the nucleus [32], and a suitable way to relate the electronic and nuclear parts of the calculation. The situation is similar to the studies of parity non-conservation, where the unknown neutron distribution would lead to an uncertainty in the interpretation of experiments for chains of isotopes [33,34], larger than the expected experimental uncertainty. 

The Bohr-Weisskopf effect for the ground state of Cs is found to be slightly increased by many-body effects, whereas the effect for the 6p states is changed considerably by the admixture of s orbitals. (Details results of the calculations will be published separately.) The Breit-Rosenthal correction also follows essentially the s orbitals, and modifications due to many-body effects for the 6s orbital should be negligible also for this effect. To analyse the ground state hfs anomaly, it would thus be sufficient to use the parameters given in Tables I and II. 

We have extended the Bohr-Weisskopf theory, based largely on the nuclear single particle model with the inclusion of core polarization in the evaluation of the effect of finite size of the nuclear magnetization. This model was found quite successful in ac-... 

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