V. Werner

Publications (3)3.95 Total impact

• Article: Spin and parity assignments to dipole excitations of the odd-mass nucleus 207Pb from nuclear resonance fluorescence experiments with linearly-polarized γ-ray beams

  N Pietralla, T C Li, M Fritzsche, M W Ahmed, D Savran, A P Tonchev, W Tornow, H R Weller, V Werner
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  ABSTRACT: Pb(,γ') photon scattering reactions were studied [1] with the nearly monochromatic, linearly polarized photon beams at the High Intensity γ-ray Source (HIγS) at the DFELL. Azimuthal scattering intensity asymmetries measured with respect to the polarization plane of the beam have been used for the first time to assign both the spin and parity quantum numbers of dipole excited states of 206,207,208Pb at excitation energies in the vicinity of 5.5 MeV. Evidence for dominant particle-core coupling is deduced from these results along with information on excitation energies and electromagnetic transition matrix elements.
  Journal of Physics Conference Series 02/2010; 205(1):012036.
• Article: Competition between excited core states and 1 hbar omega single-particle excitations at comparable energies in ²⁰⁷Pb from photon scattering

  N Pietralla, T C Li, M Fritzsche, M W Ahmed, T Ahn, A Costin, J Enders, J Li, S Müller, P Neumann-Cosel, I V Pinayev, Yu V Ponomarev, D Savran, A P Tonchev, W Tornow, H R Weller, V Werner, Y K Wu, A Zilges
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  ABSTRACT: The Pb(g,g') photon scattering reaction has been studied with the nearly monochromatic, linearly polarized photon beams at the High Intensity g-ray Source (HIgS) at the DFELL. Azimuthal scattering intensity asymmetries measured with respect to the polarization plane of the beam have been used for the first time to assign both the spin and parity quantum numbers of dipole excited states of 206,207,208Pb at excitation energies in the vicinity of 5.5 MeV. Evidence for dominant particle-core coupling is deduced from these results along with information on excitation energies and electromagnetic transition matrix elements. Implications of the existence of weakly coupled states built on highly excited core states in competition with 1 hbar omega single particle (hole) excitations at comparable energies are discussed.
  Physics Letters B 01/2009; 681(2):134-138. · 3.95 Impact Factor
• Source

  Available from: Peter von Neumann-Cosel

  Article: Competition between excited core states and 1ℏω single-particle excitations at comparable energies in 207Pb from photon scattering

  N. Pietralla, T.C. Li, M. Fritzsche, M.W. Ahmed, T. Ahn, A. Costin, J. Enders, J. Li, S. Müller, P. von Neumann-Cosel, I.V. Pinayev, V.Yu. Ponomarev, D. Savran, A.P. Tonchev, W. Tornow, H.R. Weller, V. Werner, Y.K. Wu, A. Zilges
  [show abstract] [hide abstract]
  ABSTRACT: The photon scattering reaction has been studied with the nearly monochromatic, linearly polarized photon beams at the High Intensity γ-ray Source (HIγS) at the DFELL. Azimuthal scattering intensity asymmetries measured with respect to the polarization plane of the beam have been used for the first time to assign both the spin and parity quantum numbers of dipole excited states of 206,207,208Pb at excitation energies in the vicinity of 5.5 MeV. Evidence for dominant particle–core coupling is deduced from these results along with information on excitation energies and electromagnetic transition matrix elements. Implications of the existence of weakly coupled states built on highly excited core states in competition with 1ℏω single particle (hole) excitations at comparable energies are discussed.
  Physics Letters B.