Deformation-driven p-wave halos at the drip line: Ne 31

Abstract

The halo structure of Ne31 is studied using 1n-removal reactions on C and Pb targets at 230MeV/nucleon. A combined analysis of the cross sections of these nuclear and Coulomb dominated reactions that feed directly the Ne30 ground-state reveals Ne31 to have a small neutron separation energy, 0.15-0.10+0.16MeV, and spin-parity 3/2-. Consistency of the data with reaction and large-scale shell-model calculations identifies Ne31 as deformed and having a significant p-wave halo component, suggesting that halos are more frequent occurrences at the neutron drip line. © 2014 American Physical Society.