Bonn 2010 – wissenschaftliches Programm
HK 63.2: Gruppenbericht
Freitag, 19. März 2010, 14:30–15:00, HG II
Complete dipole response in 208Pb from high-resolution polarized proton scattering at 0∘⋆ — •Iryna Poltoratska — Institut für Kernphysik, TU Darmstadt, Germany
By using the proton scattering very close to 0∘,
one can consistently measure dipole modes both above and below the neutron emission threshold.
Recent experimental progress and development at RCNP Osaka, Japan ,
allows measurements with intermediate-energy polarized beams at very forward angles
combined with high energy resolution of the order ΔE/E
≈8·10−5. The data in 208Pb indicate that at very forward
angles 1− states are strongly excited via Coulomb interaction. The extracted
B(E1) transition strengths are in a good agreement with data
obtained from a nuclear resonance fluorescence experiment .
For the separation of E1/M1 contributions two different independent methods are applied,
i.e. a multipole decomposition of the angular distribution of the cross sections utilizing
DWBA calculations and a model-independent analysis based on polarization transfer observables.
Results of the analysis will be presented.
 A. Tamii et al., Nucl. Inst. Meth. A 605, 326 (2009).
 N. Ryezayeva et al., Phys. Rev. Lett. 89, 272502 (2002).
⋆ Supported by DFG under contracts SFB 634 and 446 JAP 113/26710-2.