First observation of the Li-13 ground state

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The ground state of neutron-rich unbound Li-13 was observed for the first time in a one-proton removal reaction from Be-14 at a beam energy of 53.6 MeV/u. The Li-13 ground state was reconstructed from Li-11 and two neutrons giving a resonance energy of 120(-80)(+60) keV. All events involving single-and double-neutron interactions in the Modular Neutron Array (MoNA) were analyzed, simulated, and fitted self-consistently. The three-body (Li-11 + n + n) correlations within Jacobi coordinates showed strong dineutron characteristics. The decay energy spectrum of the intermediate Li-12 system (Li-11 + n) was described with an s-wave scattering length of greater than -4 fm, which is a smaller absolute value than reported in a previous measurement. DOI: 10.1103/PhysRevC.87.011304