Fine structure of the giant M1 resonance in 90Zr

Fine structure of the giant M1 resonance in 90Zr

The M1 excitations in the nuclide 90Zr have been studied in a photon-scattering experiment with monoenergetic and linearly polarized beams from 7 to 11 MeV. More than 40 J(π)=1+ states have been identified from observed ground-state transitions, revealing the fine structure of the giant M1 resonance...

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Veröffentlicht in:Physical review letters 2013-01, Vol.110 (2), p.022503-022503
Hauptverfasser: Rusev, G, Tsoneva, N, Dönau, F, Frauendorf, S, Schwengner, R, Tonchev, A P, Adekola, A S, Hammond, S L, Kelley, J H, Kwan, E, Lenske, H, Tornow, W, Wagner, A
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Sprache:eng
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Zusammenfassung:The M1 excitations in the nuclide 90Zr have been studied in a photon-scattering experiment with monoenergetic and linearly polarized beams from 7 to 11 MeV. More than 40 J(π)=1+ states have been identified from observed ground-state transitions, revealing the fine structure of the giant M1 resonance with a centroid energy of 9 MeV and a sum strength of 4.17(56) μ(N)(2). The result for the total M1 strength and its fragmentation are discussed in the framework of the three-phonon quasiparticle-phonon model.
ISSN:0031-9007
1079-7114