Nuclear structure of 17Ne by the three-neutron pickup (3He,6He) reaction

The nuclear structure of Ne-17 has been studied by the Ne-20(He-3,He-6)Ne-17 reaction at 70 MeV. Thirteen levels were identified in Ne-17, and angular distributions have been measured for the first time for this reaction. Based on the observed transferred angular momentum dependence of the angular distributions, a spin-parity assignment has been made for several states in Ne-17. With the inclusion of the data on Ne-17, T=3/2 quartet analog states have been completed for six levels in the A=17 isobar system. The level shifts in these A=17 nuclei are analyzed in terms of the isobaric multiplet mass equation (IMME). The results of such an analysis show a slight linear dependence of the b and c coefficients of the equation on the excitation energy. The coefficients for the positive parity states seem to follow a different systematics than the negative parity states, suggesting that these parity-dependent level shifts are reflecting the structure change. These coefficients of the IMME are discussed.