Damping of the giant spin-flip dipole and spin-flip quadrupole charge exchange modes in 90Zr |
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| Institution: | 1. Institut für Kernphysik, KFA Jülich, D-5170 Jülich, Fed. Rep. Germany;2. Institute of Nuclear Physics, PL-31-342 Cracow, Poland;3. Institut für Theoretische Kernphysik, Universität Bonn, D-5300 Bonn, Fed. Rep. Germany;4. Department of Physics, University of Illinois, Urbana, IL 61801, USA;1. Department of Physical Electronics and Technology, Saint Petersburg Electrotechnical University “LETI”, St. Petersburg 197022, Russia;2. Department of Physics, University of Western Australia, Crawley, Western Australia 6009, Australia;1. Institut für Theoretische Physik, Universität zu Köln, Zülpicher Straße 77, 50937 Köln, Germany;2. W. I. Fine Theoretical Physics Institute and School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, USA |
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| Abstract: | The damping of the giant spin-flip dipole (L=1, S=1, T=1, Jπ=0−, 1−, 2−) and spin-flip quadrupole (L=2, S=1, T=1, Jπ=1+, 2+, 3+) charge exchange resonances in 90Zr is calculated in a microscopic nuclear structure model which includes both one-particle-one-hole (1p1h) and two-particle-two-hole (2p2h) configurations in a systematic way. It is shown that the coupling to 2p2h configurations gives rise to a strongly energy dependent spreading width which shifts a large fraction of transition strength to high excitation energies. The implications for the analysis of intermediate energy 90Zr(p,n) data is discussed. |
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