Abstract
The ground-state configuration of has been studied via Coulomb dissociation (CD) using the LAND-FRS setup (GSI, Darmstadt) at a relativistic energy of MeV/nucleon. The measured inclusive differential CD cross section for , integrated up to 5.0 MeV relative energy between the core and the neutron using a Pb target, is 78(13) mb. The exclusive measured CD cross section that populates various excited states of is 29(7) mb. The differential CD cross section of has been interpreted in the light of a direct breakup model, and it suggests that the possible ground-state spin and parity of could be, tentatively, or or . The valence neutrons, in the ground state of , may occupy a combination of either or orbitals coupled with the core in the ground and isomeric state(s), respectively. This hints of a particle-hole configuration of the neutron across the magic shell gaps at which suggests narrowing the magic shell gap. If the is the ground-state spin-parity of as suggested in the literature, then the major ground-state configuration of is a combination of and states. The result from this experiment has been compared with that from a previous knockout measurement and a calculation using the SDPF-M interaction.
- Received 15 July 2017
DOI:https://doi.org/10.1103/PhysRevC.96.034301
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