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Bochum 2009 – wissenschaftliches Programm

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HK: Fachverband Hadronen und Kerne

HK 71: Nuclear Structure and Dynamics I

HK 71.3: Gruppenbericht

Donnerstag, 19. März 2009, 17:30–18:00, H-ZO 40

Complete dipole response in 208Pb from high-resolution polarized proton scattering at 0 — •Iryna Poltoratska — Institut für Kernphysik, Technische Universität Darmstadt, Germany

In proton scattering at angles close to 0 one can selectively study dipole modes which, apart from the isovector giant dipole resonance, are poorly understood. Recent experimental progress at RCNP Osaka, Japan [1], allows measurements with intermediate-energy polarized beams at very forward angles including 0 combined with high energy resolution of the order ΔE/E ≈8·10−5. This new experimental opportunity was applied to study soft electric dipole modes such as Pygmy Dipole Resonance (PDR) and the so-called toroidal mode. The preliminary data analysis indicates 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 [2]. E1/M1 contributions are separated based on multipole decomposition of a cross section angular distributions and utilizing spin-transfer observables.
[1] A. Tamii et al.,Nucl. Phys. A 788 (2007) 53c.
[2] N. Ryezayeva et al., Phys. Rev. Lett. 89, 272502 (2002).
 Supported by DFG contracts SFB 634 and 446 JAP 113/26710-2.

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