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HK: Fachverband Hadronen und Kerne
HK 72: Nuclear Structure and Dynamics II
HK 72.5: Vortrag
Donnerstag, 19. März 2009, 17:45–18:00, H-ZO 50
Microscopic study of Neon isotopes, including the two-proton halo 17Ne — •Thomas Neff and Hans Feldmeier — GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
Fermionic Molecular Dynamics (FMD) is a many-body approach that uses Gaussian wave-packets localized in phase-space as single-particle states. The wave-packet basis is very flexible and includes harmonic oscillator and localized cluster states. The width of the wave-packets is a variational parameter which helps to describe extended nuclear halos. The intrinsic many-body basis states are projected on parity, angular momentum and linear momentum. The Hamiltonian is finally diagonalized in a set of many-body states. In this talk I will present calculations for the Neon isotopes 17−22Ne. The calculated charge radii describe very well recent experimental results from the COLLAPS collaboration. The calculations show that 17Ne (18Ne) can be considered as 15O (16O) plus two protons in either s2 or d2 configurations. In 17Ne we find an extended s2-component with about 40% contribution explaining the very large charge radius. In 18Ne the s2-component is only 15% corresponding to a smaller radius. In 19,20Ne again very large charge radii are observed which are due to the admixture of 3He and 4He cluster configurations into the ground states.
[1] W. Geithner, T. Neff, et al., accecpted for publication in Phys. Rev. Lett.