Köln 2004 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 3: Electromagnetic and Hadronic Probes I
HK 3.9: Vortrag
Montag, 8. März 2004, 18:30–18:45, B
Isovector Spin-Flip Resonances in Medium-Mass and Heavy Nuclei⋆ — •Y. Kalmykov1, T. Adachi2, G.P.A. Berg3, H. Fujita3, Y. Fujita2, F. Hofmann1, P. von Neumann-Cosel1, V.Yu. Ponomarev1, B. Reitz1, A. Richter1, A. Shevchenko1, Y. Shimbara2, and J. Wambach1 — 1Institut für Kernphysik, Technische Universität Darmstadt, Germany — 2Department of Physics, Osaka University, Japan — 3Research Center for Nuclear Physics, Osaka University, Japan
Recent progress in the understanding of isovector
spin-flip resonances is discussed. The reaction
90Zr(3He,t)90Nb was studied at 0∘ with a
3He beam of energy E0 = 140 MeV/u. Highest energy
resolution allows for the first time to unravel the fine structure
of GTR in a heavy nucleus. Recently developed wavelet analysis
techniques determine its characteristic energy scales which
provide unique insight into the damping of resonances through
internal mixing. The data also allow extraction of spin- and
parity-separated level densities by means of a fluctuation
analysis. The reaction 58Ni(p→,p→ ′) was
investigated at incident energy of 172 MeV up to 23 MeV and
forward angles favoring the excitation of the spin-dipole mode in
the continuum. The results are compared to state-of-the-art
microscopic reaction calculations. The nuclear structure input,
which takes the coupling to complex configurations into account,
allows for the first time a satisfactory description of the
spin-flip probabilities and cross sections over a wide excitation
energy and angle range.
⋆ Supported by the DFG under SFB 634 and 446 JAP 113/267/0-1.