Münster 2011 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 9: Struktur und Dynamik von Kernen II
HK 9.1: Gruppenbericht
Montag, 21. März 2011, 16:30–17:00, O-1
Octupole Vibrations in Rare-earth Nuclei — •Michael Elvers1,2, Carolin Küppersbusch1, Janis Endres1, Deniz Savran2,3,4, Volker Werner2, and Andreas Zilges1 — 1Institut für Kernphysik, Universität zu Köln — 2Wright Nuclear Structure Laboratory, Yale University — 3ExtreMe Matter Institute EMMI and Research Division, GSI, Darmstadt — 4Frankfurt Institute for Advanced Studies FIAS
In rare-earth nuclei with nucleon numbers close to the neutron and proton shell closure, low-lying excitations can be described in terms of phonon excitations. The easiest excitations are quadrupole and octupole vibrations carrying spin Jπ=2+ and Jπ=3−, respectively, which can couple to two-phonon states with spin (1−5)−.
With an increasing number of both valence protons and neutrons, the nuclei show a deformed axially symmetric shape which leads to a new quantum number K. Now octupole vibrations built on rational states are observed and a band structure is established. It is identified by the K quantum number which is, in general, not a good quantum number [1].
Several nuclei in both regions have been investigated via fusion-evaporation reactions and inelastic particle scattering. The results on octupole vibrational states, their decay properties, and the mixing of the K quantum number will be discussed.
Supported by the DFG (ZI 510/4-1), U.S. DOE grant DE-FG02-01ER40609, Alliance Program of the Helmholtz Association (HA216/EMMI), and Bonn-Cologne Graduate School of Physics and Astronomy. [1] A. Bäcklin et. al, Nucl. Phys. A380 (1982) 189.