期刊
PHYSICAL REVIEW C
卷 88, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.88.034313
关键词
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资金
- Helmholtz International Center for FAIR
- Helmholtz Alliance Program of the Helmholtz Association [HA216/EMMI]
- GSI-TU Darmstadt Cooperation agreement
- BMBF [06DA70471, 06DA9040I, 06MT238]
- DFG
- US DOE [DE-FC02-07ER41457, DE-FG02-96ER40963]
- Portuguese FCT [PTDC/FIS/103902/2008]
- Fundação para a Ciência e a Tecnologia [PTDC/FIS/103902/2008] Funding Source: FCT
- Science and Technology Facilities Council [ST/E500651/1, ST/I504967/1, ST/I504967/1 NuSTAR, ST/J000108/1, NuSTAR, EP/C51646X/1, ST/J000051/1, ST/J000140/1, ST/J000094/1, ST/G000727/1, ST/G000662/1] Funding Source: researchfish
- STFC [ST/J000108/1, ST/I504967/1, ST/J000051/1, ST/E500651/1, NuSTAR, ST/G000727/1, ST/J000094/1, ST/J000140/1] Funding Source: UKRI
The very neutron-rich oxygen isotopes O-25 and O-26 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 F-26 and F-27 at relativistic energies around 442 and 414 MeV/nucleon, respectively. From the kinematically complete measurement of the decay into O-24 plus one or two neutrons, the O-25 ground-state energy and width are determined, and upper limits for the O-26 ground-state energy and lifetime are extracted. In addition, the results provide indications for an excited state in O-26 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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