Heidelberg 2015 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 45: Structure and Dynamics of Nuclei 9
HK 45.4: Vortrag
Mittwoch, 25. März 2015, 15:45–16:00, T/HS2
Origin of low-lying enhanced E1 strength in rare-earth nuclei — •Mark Spieker1, Sorin Pascu1,2, and Andreas Zilges1 — 1Institute for Nuclear Physics, University of Cologne, Germany — 2Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest, Romania
Candidates for excited α-cluster states have been identified in many light nuclei being organized in rather simple quasimolecular configurations [1]. For heavier nuclei the existence of these states remains an open question, though different experimental observables have been discussed as possible signatures. The electric dipole response of atomic nuclei is intimately connected to the breaking of isospin symmetry in simplified macroscopic nuclear models. Here, an α cluster could oscillate against the remaining core, which would generate a dynamic electric dipole moment in the nucleus [2]. To study this possibility, we have adopted the spdf interacting boson model for the description of the E1 response below 4 MeV in the neodymium isotopes. In this contribution, we will show that the model successfully reproduces the main features of the E1 response and, thus, might establish α clusters as an important ingredient to describe the E1 strength distribution in heavier nuclei. Supported by the DFG (ZI-510/4-2).
[1] W. von Oertzen et al., Phys. Rep. 432 (2006) 43
[2] F. Iachello, Phys. Lett. B 160 (1985) 1