Advanced nuclear structure models predict the presence of the shell closures N = 14, 16 in neutron‐rich O isotopes rather than N = 20. Spectroscopic investigations performed at the neutron drip line have recently confirmed such predictions showing that the 24O is a doubly magic nucleus (Z = 8,N = 16). Predictions within the shell model calculation for the 23,24O ground state have been confirmed measuring their spectroscopic factors. Results obtained in one‐neutron removal reactions performed by using in‐flight radioactive ion beams produced at the Fragment Separator FRS of GSI are reported.

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