Darmstadt 2008 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 41: Kernphysik / Spektroskopie
HK 41.7: Talk
Thursday, March 13, 2008, 18:15–18:30, 2G
High-resolution study of dipole excitations in 208Pb with polarized proton scattering at 0∘⋆ — •Iryna Poltoratska1, Tatsuya Adachi2, John Carter3, Hirohiko Fujita3,4, Yoshitaka Fujita2, Jens Hasper1, Kichiji Hatanaka2, Yaroslav Kalmykov1, Maiko Kato2, Hiroaki Matsubara2, Peter von Neumann-Cosel1, Vladimir Ponomarev1, Achim Richter1, Harutaka Sakaguchi5, Yasuhiro Sakemi2, Yohei Shimizu2, Yuji Tameshige2, Atsushi Tamii2, Masaru Yosoi2, and Juzo Zenihiro5 — 1Institut für Kernphysik, TU Darmstdat, — 2RCNP, Osaka University, Japan — 3School of Physics, University of Witwatersrand, — 4iThembaLABS, South Africa — 5Department of Physics, Kyoto University, Japan
At angles close to 0∘ one can study dipole
modes which apart from the isovector giant dipole resonance, are
poorly understood. Recent experimental progress at RCNP Osaka,
Japan [1], 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 an exotic electric dipole mode,
the so-called toroidal mode. Extensive model calculations show
that a unique signature of such excitations may be found in the
Coulomb-nuclear interference region. 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] A. Tamii et al.,
Nucl. Phys. A788 (2007) 53.
⋆ Supported by the DFG through SFB 634.