One- and two-neutron removal cross sections of O 24

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© 2018 American Physical Society. Cross sections of one- and two-neutron removal reactions of O24, leading to the O23(12+) ground state and to bound final states of O22, have been measured at the National Superconducting Cyclotron Laboratory. The experiment was conducted using the S800 spectrograph and a O24 beam energy of 92.3 MeV/u. The measured O23 ground state and O22 inclusive cross section values, of 74(11) and 146(33) mb, respectively, are in good agreement with calculations using eikonal reaction dynamics and shell-model nuclear structure overlaps. The widths at half maximum of the associated parallel momentum distributions of these cross sections, deduced from Gaussian fits, are 115(13) MeV/c for O23 and 309(36) MeV/c for O22 in the projectile rest frame. The data and calculations strongly support the shell-model description of O24 as a spherical, doubly-magic structure.