München 2006 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 44: Kern- und Teilchen-Astrophysik
HK 44.4: Vortrag
Donnerstag, 23. März 2006, 14:45–15:00, E
Shell Model Monte Carlo, Wavelet Analysis and Characteristic Scales of Magnetic Dipole Resonance in fp-shell nuclei. — •Ilka Petermann1, Yaroslav Kalmykov1, Karlheinz Langanke2, Gabriel Martinez-Pinedo2, Peter von Neumann-Cosel1, Achim Richter1, and Artem Shevchenko1 — 1IKP TU Darmstadt — 2GSI
Fine structure of giant resonances has been recently established as a global physics phenomenon [1]. A novel technique of wavelet analysis allowed to extract characteristic energy scales from the electric isoscalar giant quadrupole and magnetic Gamow-Teller resonances. The origin of scales is the coupling of 1p-1h states to more complex 2p-2h configurations. The similar technique is now applied to (e,e’) data from S-DALINAC on M1 resonance in several fp-shell nuclei, e.g. 50Ti, 52Cr, 54,56Fe. The comparison is made with the modern shell model Monte Carlo calculations [2], which give a reliable description of M1 strength, important for astrophysics. Combined with wavelet analysis this provides a unique tool to investigate the role of different aspects in microscopic models, like various interactions, truncation level in many-particle–many-hole hierarchy, isospin projections, spin and orbital contributions etc. The results of such analysis will be presented and discussed.
[1] A. Shevchenko et al., Phys. Rev. Lett. 93 (2004) 122501.
[2] E. Caurier et al., Rev. Mod. Phys. 77 (2005) 427.
*Supported by the DFG through SFB 634.