Abstract

The multistep shell-model method is used to analyse the multiplet structure of 205Pb and 203Pb in terms of single-hole states ( 207Pb) coupled to two- ( 206Pb) and four- ( 204Pb) hole excitations, respectively. It is found that at least one member of a given multiplet is generally completely blocked by the Pauli principle. The standard shell-model method is also applied to analyse the spectrum of 205Pb and the results of both calculations are compared. Good agreement with the available experimental data is found.

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