title: First observation of the unbound nucleus 15Ne.
abstract: We report on the first observation of the unbound proton-rich nucleus 15Ne. Its ground state and first excited state were populated in two-neutron knockout reactions from a beam of 500 MeV/u 17Ne. The 15Ne ground state is found to be unbound by 2.522(66) MeV. The decay proceeds directly to 13O with simultaneous two-proton emission. No evidence for sequential decay via the energetically allowed 2- and 1- states in 14F is observed. The 15Ne ground state is shown to have a strong configuration with two protons in the (sd) shell around 13O with a 63(5)% (1s1/2)2 component.
authors.affiliation: Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany and GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany and ExtreMe Matter Institute EMMI and Research Division GSI, D-64291 Darmstadt, Germany and Frankfurt Institute for Advanced Studies FIAS, D-60438 Frankfurt am Main, Germany.
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authors.affiliation: Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany and GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany and ExtreMe Matter Institute EMMI and Research Division GSI, D-64291 Darmstadt, Germany.
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