New lifetime measurements in 109Pd and the onset of deformation at N = 60

Abstract : Several new subnanosecond lifetimes were measured in 109Pd using the fast-timing βγ γ (t ) method. Fission fragments of the A = 109 mass chain were produced by bombarding natural uranium with 30 MeV protons at the Jyv¨askyl¨a Ion Guide Isotope Separator On-Line (IGISOL) facility. Lifetimes were obtained for excited states in 109Pd populated following β decay of 109Rh. The new lifetimes provide some insight into the evolution of nuclear structure in thismass 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 πg9/2 and νg7/2 valence nucleons expected in this region.
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Submitted on : Friday, January 8, 2016 - 9:15:19 AM
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B. Bucher, H. Mach, A. Aprahamian, G.S. Simpson, J. Rissanen, et al.. New lifetime measurements in 109Pd and the onset of deformation at N = 60. Physical Review C, American Physical Society, 2015, 92 (6), pp.064312. ⟨10.1103/PhysRevC.92.064312⟩. ⟨in2p3-01252709⟩

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