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Título

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

Autor Caesar, C.; García Borge, María José ; Perea, Ángel ; Ribeiro, G.; Sánchez del Río, J.; Tengblad, Olof ; Zuber, K.
Palabras clave [PACS] Reactions induced by unstable nuclei
[PACS] Properties of specific nuclei listed by mass ranges
[PACS] Neutron spectroscopy
nuclear energy levels
[PACS] Properties of nuclei
Fecha de publicación 2013
EditorAmerican Physical Society
Citación Physical Review C - Nuclear Physics 88, 034313 (2013)
ResumenThe 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. © 2013 American Physical Society.
URI http://hdl.handle.net/10261/102848
DOI10.1103/PhysRevC.88.034313
Identificadoresdoi: 10.1103/PhysRevC.88.034313
issn: 0556-2813
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