Nucleus 26^{26}O : A Barely Unbound System beyond the Drip Line

Mar 9, 2016
6 pages
Published in:
  • Phys.Rev.Lett. 116 (2016) 10, 102503
  • Published: Mar 9, 2016

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Abstract: (APS)
The unbound nucleus O26 has been investigated using invariant-mass spectroscopy following one-proton removal reaction from a F27 beam at 201  MeV/nucleon. The decay products, O24 and two neutrons, were detected in coincidence using the newly commissioned SAMURAI spectrometer at the RIKEN Radioactive Isotope Beam Factory. The O26 ground-state resonance was found to lie only 18±3(stat)±4(syst)  keV above threshold. In addition, a higher lying level, which is most likely the first 2+ state, was observed for the first time at 1.28-0.08+0.11  MeV above threshold. Comparison with theoretical predictions suggests that three-nucleon forces, pf-shell intruder configurations, and the continuum are key elements to understanding the structure of the most neutron-rich oxygen isotopes beyond the drip line.
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