Neutron particle-hole structure of states in 208Pb determined from the proton decay of the d5/2 isobaric analog resonance in 209Bi

  • A. HeuslerEmail author
  • T. Faestermann
  • G. Graw
  • R. Hertenberger
  • J. Jolie
  • R. Krücken
  • D. Mücher
  • N. Pietralla
  • C. Scholl
  • V. Werner
  • H. -F. Wirth
  • P. von Brentano
Regular Article - Experimental Physics


Proton scattering on 208Pb via isobaric analog resonances (IARs) in 209Bi generates neutron particle-hole configurations in excited states of 208Pb . The spin and parity of the neutron particle correspond to the spin and parity of the resonance. We performed experiments on the 208Pb (p, p’) reaction via all known isobaric analog resonances in 209Bi with the Q3D magnetic spectrograph in München. We observed more than 130 levels in the range of excitation energies E x < 6.4 MeV. In the proton decay of the d 5/2 resonance, 29 levels have cross-sections larger than 5% of the maximum cross-section of any level. Six levels in the range 4.6 < E x < 5.2 MeV correspond to states with known spins and major \(\ensuremath \nu(d_{5/2}^{+1} p_{1/2}^{-1})\) strength. Six levels in the range 5.7 < E x < 6.4 MeV contain most of the \(\ensuremath \nu(d_{5/2}^{+1} p_{3/2}^{-1})\) strength. At least one level originates from an unresolved doublet. Among the states with a major \(\ensuremath \nu(d_{5/2}^{+1} p_{3/2}^{-1})\) component, only states with spins 1- and 3- are firmly identified. The comparison to previous data taken with semiconductor detectors reveals details of the structure of at least 18 states in the range 4.6 < E x < 6.4 MeV.


Excitation Energy 208Pb Excitation Function Proton Decay Semiconductor Detector 
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Copyright information

© SIF, Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • A. Heusler
    • 1
    Email author
  • T. Faestermann
    • 2
  • G. Graw
    • 3
  • R. Hertenberger
    • 3
  • J. Jolie
    • 4
  • R. Krücken
    • 2
  • D. Mücher
    • 2
  • N. Pietralla
    • 5
  • C. Scholl
    • 4
  • V. Werner
    • 6
  • H. -F. Wirth
    • 3
  • P. von Brentano
    • 4
  1. 1.Max-Planck-Institut für KernphysikHeidelbergGermany
  2. 2.Physik Department E12Technische Universität MünchenGarchingGermany
  3. 3.Fakultät für PhysikLudwig-Maximilians-Universität MünchenGarchingGermany
  4. 4.Institut für KernphysikUniversität zu KölnKölnGermany
  5. 5.Institut für KernphysikTechnische Universität DarmstadtDarmstadtGermany
  6. 6.WNSLYale UniversityNew HavenUSA

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