Journal
PHYSICAL REVIEW LETTERS
Volume 115, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.172501
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Funding
- European Union [262010]
- German BMBF [06KY9136I, 05P12PKFNE, 05P15PKCIA, 06DA9036I, 05P12RDCIA, 05P15RDCIA]
- U.S. Department of Energy, Office of Science, Office of Nuclear Physics [DE-AC02-06CH11357]
- STFC [ST/L005824/1, ST/L005808/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/L005808/1] Funding Source: researchfish
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Excited states of the neutron-rich nuclei Rb-97,Rb- 99 were populated for the first time using the multistep Coulomb excitation of radioactive beams. Comparisons of the results with particle-rotor model calculations provide clear identification for the ground-state rotational band of Rb-97 as being built on the pi g(9/2) [431] 3/2(+) Nilsson-model configuration. The ground-state excitation spectra of the Rb isotopes show a marked distinction between single-particle-like structures below N = 60 and rotational bands above. The present study defines the limits of the deformed region around A similar to 100 and indicates that the deformation of Rb-97 is essentially the same as that observed well inside the deformed region. It further highlights the power of the Coulomb-excitation technique for obtaining spectroscopic information far from stability. The Rb-99 case demonstrates the challenges of studies with very short-lived postaccelerated radioactive beams.
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