Loading...
Beyond the neutron drip line: The unbound oxygen isotopes (25)O and (26)O
Wilson, Graham Wallace Caesar, C. Simonis, J. Adachi, T. Aksyutina, Y. Alcantara, J. Altstadt, S. Alvarez-Pol, H. Ashwood, N. I. Aumann, T.
Wilson, Graham Wallace
Caesar, C.
Simonis, J.
Adachi, T.
Aksyutina, Y.
Alcantara, J.
Altstadt, S.
Alvarez-Pol, H.
Ashwood, N. I.
Aumann, T.
Citations
Altmetric:
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.
Description
This is the publisher's version, and is also available electronically from http://journals.aps.org/prc/abstract/10.1103/PhysRevC.88.034313.
Date
2013-09-16
Journal Title
Journal ISSN
Volume Title
Publisher
American Physical Society
Collections
Research Projects
Organizational Units
Journal Issue
Keywords
Citation
Caesar, C. et al. (2013). "Beyond the neutron drip line: The unbound oxygen isotopes (25)O and (26)O." Physical Review C, 88(3):34313. http://www.dx.doi.org/10.1103/PhysRevC.88.034313.