Beyond the neutron drip line: The unbound oxygen isotopes 25O and 26O

C. Caesar et al. (R3B collaboration)
Phys. Rev. C 88, 034313 – Published 16 September 2013

Abstract

The very neutron-rich oxygen isotopes 25O and 26O are investigated experimentally and theoretically. The unbound states are populated in an experiment performed at the R3B-LAND setup at GSI via proton-knockout reactions from 26F and 27F at relativistic energies around 442 and 414 MeV/nucleon, respectively. From the kinematically complete measurement of the decay into 24O plus one or two neutrons, the 25O ground-state energy and width are determined, and upper limits for the 26O ground-state energy and lifetime are extracted. In addition, the results provide indications for an excited state in 26O at around 4 MeV. The experimental findings are compared to theoretical shell-model calculations based on chiral two- and three-nucleon (3N) forces, including for the first time residual 3N forces, which are shown to be amplified as valence neutrons are added.

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  • Received 2 September 2012

DOI:https://doi.org/10.1103/PhysRevC.88.034313

©2013 American Physical Society

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Vol. 88, Iss. 3 — September 2013

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