One-neutron knockout from [superscript 24–28]Ne isotopes

Abstract

One-neutron knockout reactions of [superscript 24–28]Ne in a beryllium target have been studied in the Fragment Separator (FRS), at GSI. The results include inclusive one-neutron knockout cross-sections as well as longitudinal-momentum distributions of the knockout fragments. The ground-state structure of the neutron-rich neon isotopes was obtained from an analysis of the measured momentum distributions. The results indicate that the two heaviest isotopes, [superscript 27]Ne and [superscript 28]Ne, are dominated by a configuration in which a s[subscript 1/2] neutron is coupled to an excited state of the [superscript 26]Ne and [superscript 27]Ne core, respectively.