Gießen 2007 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 41: Kernphysik / Spektroskopie
HK 41.4: Talk
Thursday, March 15, 2007, 12:00–12:15, B
High-resolution study of dipole excitations in 208Pb with polarized proton scattering at 0∘⋆ — •I. Poltoratska1, T. Adachi2, J. Carter3, H. Fujita3,4, Y. Fujita2, J. Hasper1, K. Hatanaka2, Y. Kalmykov1, M. Kato2, H. Matsubara2, P. von Neumann-Cosel1, V. Ponomarev1, A. Richter1, H. Sakaguchi5, Y. Sakemi2, Y. Sasamoto6, Y. Shimizu2, Y. Tameshige2, A. Tamii2, M. Yosoi2, and J. Zenihiro5 — 1Institut für Kernphysik, TU Darmstadt,Germany — 2RCNP, Osaka University, Japan — 3University of Witwatersrand, South Africa — 4iThembaLABS, South Africa — 5Department of Physics, Kyoto University,Japan — 6CNS, University of Tokyo, Japan
A topic of high current interest are investigations
of exotic electric dipole modes at energies well below the GDR.
Recent (γ, γ′) experiment and theoretical QPM
calculations [1] predict the existence of such dipole modes like
the toroidal E1 mode in 208Pb with vortex transition current
distribution between 6 and 11 MeV. Recent experimental progress at
RCNP Osaka, Japan, allows measurements of intermediate-energy
polarized inelastic proton scattering at and near 0∘
combined with high energy resolution. This new experimental
opportunity was applied for an investigation of the toroidal mode.
Measurements of the angular distribution and polarization transfer
coefficients for E1 excitations might provide direct evidence of
the toroidal mode. First results from the experiments will be
presented.
[1] N. Ryezayeva et al.,
Phys. Rev. Lett. 89, 272502 (2002).
⋆ Supported by the DFG through SFB 634.