New lifetime measurements in 109 Pd and the onset of deformation at N = 60
Bucher, B., Mach, H., Aprahamian, A., Simpson, G. S., Rissanen, J., Ghiţă, D. G., . . . Weber, C. (2015). New lifetime measurements in 109 Pd and the onset of deformation at N = 60. Physical review C, 92 (6), 064312. doi:10.1103/PhysRevC.92.064312
Published inPhysical review C
Mach, H. |
© 2015 American Physical Society. Published in this repository with the kind permission of the publisher.
Several new subnanosecond lifetimes were measured in 109Pd using the fast-timing βγγ (t) method. Fission fragments of the A = 109 mass chain were produced by bombarding natural uranium with 30 MeV protons at the Jyvaskyl ¨ 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 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 πg9/2 and νg7/2 valence nucleons expected in this region.