N=14and 16 shell gaps in neutron-rich oxygen isotopes
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Abstract
In-beam $\ensuremath{\gamma}$-ray spectroscopy using fragmentation reactions of both stable and radioactive beams has been performed in order to study the structure of excited states in neutron-rich oxygen isotopes with masses ranging from $A=20$ to 24. For the produced fragments, $\ensuremath{\gamma}$-ray energies, intensities, and $\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}$ coincidences have been measured. Based on this information new level schemes are proposed for $^{21,22}\mathrm{O}$ up to the neutron separation energy. The nonobservation of any $\ensuremath{\gamma}$-decay branch from $^{23}\mathrm{O}$ and $^{24}\mathrm{O}$ suggests that their excited states lie above the neutron decay thresholds. From this, as well as from the level schemes proposed for $^{21}\mathrm{O}$ and $^{22}\mathrm{O}$, the size of the $N=14$ and 16 shell gaps in oxygen isotopes is discussed in the light of shell-model calculations.
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