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Excited states in $^{20}$O were populated in the reaction$^{10}$Be($^{14}$C,$\alpha$) at Florida State University. Charged particleswere detected with a particle telescope consisting of 4 annularly segmented Sisurface barrier detectors and $\gamma$ radiation was detected with the FSU$\gamma$ detector array. Five new states were observed below 6 MeV from the$\alpha$-$\gamma$ and $\alpha$-$\gamma$-$\gamma$ coincidence data. Shell modelcalculations suggest that most of the newly observed states are core-excited1p-1h excitations across the $N = Z = 8$ shell gap. Comparisons betweenexperimental data and calculations for the neutron-rich O and F isotopes implya steady reduction of the $p$-$sd$ shell gap as neutrons are added

physical review letters

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p−sdShell Gap Reduction in Neutron-Rich Systems and Cross-Shell Excitations inO20