New lifetime measurements in Pd-109 and the onset of deformation at N=60
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2015
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Amer Physical Soc
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Abstract
Several new subnanosecond lifetimes were measured in Pd-109 using the fast-timing beta gamma gamma (t) method. Fission fragments of the A = 109 mass chain were produced by bombarding natural uranium with 30 MeV protons at the Jyvaskyla Ion Guide Isotope Separator On-Line (IGISOL) facility. Lifetimes were obtained for excited states in Pd-109 populated following beta decay of Rh-109. The new lifetimes provide some insight into the evolution of nuclear structure in this mass region. In particular, the distinct structure of the two low-lying 7/2(+) states occurring systematically across the Pd isotopic chain is supported by the new lifetime measurements. The available nuclear data indicate a sudden increase in deformation at N = 60 which is related to the strong p-n interaction between pi g(9/2) and vg(7/2) valence nucleons expected in this region.
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©2015 American Physical Society.
Artículo firmado por 21 autores.
B.B. would like to acknowledge helpful discussions with S. Frauendorf and A. O. Macchiavelli. Figures 1(a), 4, and 5 were created using the LEVELSCHEME scientific figure preparation system [70]. This project was funded by the National Science Foundation through Grants No. PHY0822648 and No. PHY0758100 and supported by EU 6th Framework program (Integrating Infrastructure Initiative-Transnational Access) Contract No. 506065 (EURONS), the Spanish MINECO via FPA-2013-41267-P, and by the Academy of Finland under the Centre of Excellence Programme 2006-2011 (nuclear and accelerator based physics program at JYFL). B.B. acknowledges support from the U.S. Department of Energy and Lawrence Livermore National Laboratory under Contract No. DE-AC52-07NA27344.