Abstract
States of the Ar II ion whose eigenvectors contain large components of single-hole configurations are observed in the (e,2e) and ( gamma ,e) reactions on the Ar I atom. The cross section is regarded as being proportional to the spectroscopic factor, that is the state expectation value of the single-hole configuration in the eigenvector. Spectroscopic factors obtained from these reactions for 1/2+ states are compared with those obtained by diagonalising an effective Hamiltonian in a model space, with radial matrix elements determined by fitting spectra for bound states. (e,2e) and conventional spectroscopy are compatible and provide complementary information about structure. Simple analysis of the present ( gamma ,e) data does not lead to compatible information on spectroscopic factors.
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