Abstract
The study of the decay of neutron-rich Cs isotopes has two main objectives: on one side β decay is a perfect tool to access the low-spin structures in the daughter Ba nuclei, where the evolution of octupole deformed shapes can be followed, while, on the other hand, the study of the gross properties of these decays, in terms of decay rates and branching to delayed-neutron emission, are fundamental inputs for the modelling of the r-process in the Rare-Earth Elements peak. Results obtained at CERN-ISOLDE are discussed within this framework and compared to existing data and predictions from state-of-the-art nuclear models.
Highlights
Barium isotopes (Z = 56) are located in a region of the Segre chart characterized by a variety of shape-related phenomena, including shape coexistence and possible static octupole deformation
The interest in this mass region is based on the occurrence of exotic shapes, and on the fact that these nuclei contribute to the peak of Rare-Earth Elements (REE)
In order to correctly model this process one has to provide a series of experimental quantities, which are not accessible, given the very exotic nature of the parent nuclei
Summary
ISOLDE-EP, CERN, CH-1211 Geneva 23, Switzerland “Horia Hulubei” National Institute of Physics and Nuclear Engineering, RO-077125 Bucharest, Romania. ISOLDE-EP, CERN, CH-1211 Geneva 23, Switzerland Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain. Grupo de Fısica Nuclear, Facultad de CC.
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