Two-proton decay correlations in the sd-shell

Neutron knockout reactions from the interaction of a E/A $=$ 57.6 MeV $^{\mathrm{17}}$Ne beam with a $^{\mathrm{9}}$Be target populated levels in $^{\mathrm{16}}$Ne. The correlations between the momenta of the $^{\mathrm{14}}$O$+$p$+$p fragments following two-proton (2p) decay were measured using the charged-particle array HiRA (High Resolution Array). Using correlation data measured for the ground state of $^{\mathrm{16}}$Ne, we were able to test our three-body model for a broad set of parameters. The high statistics and resolution of the data allowed for an unambiguous determination of the effect of the long-range Coulomb interaction on three-body Coulomb decay. The first-excited, J$^{\mathrm{\pi }}=$ 2$^{\mathrm{+}}$ state in $^{\mathrm{16}}$Ne was also populated strongly by neutron knockout. The correlations measured from its 2p decay are quite unusual, displaying aspects of both sequential and diproton-like decay. This unusual behavior is largely reproduced by the three-body model and will also be presented here.