Bonn 2010 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 29: Struktur und Dynamik von Kernen VI

HK 29.9: Talk

Tuesday, March 16, 2010, 18:30–18:45, HG VII

Coulomb excitation of neutron-rich ^29,30Na with MINIBALL at REX-ISOLDE: Mapping the borders of the Island of Inversion — •Michael Seidlitz and Peter Reiter — Institut für Kernphysik, Universität zu Köln

For the ^28,29,30Na isotopes a gradual transition from the usual filling of the neutron levels into the region with low lying 2p-2h cross shell configurations, the so-called Island of Inversion, is described by theory [1,2]. Detailed theoretical predictions for the transition strength are awaiting experimental verification in all three Na nuclei. Collective properties of excited states of ^29,30Na were subject of a recent Coulomb excitation experiment at REX-ISOLDE employing radioactive ^29,30Na beams with a final energy of 2.85 MeV/u. De-excitation γ-rays were detected by the MINIBALL γ-spectrometer in coincidence with scattered particles in a CD-shaped segmented Si-detector. The determined B(E2) values for the first excited states in both nuclei confirmed recent results [3,4]. However predicted transition strenghts to higher lying states could not be confirmed. The new data show an increase in collectivity for very low lying states in neutron rich ^29,30Na, indicating a deformed intruder dominated ground state configuration.

Supported by BMBF under contract 06KY205I

[1] T. Otsuka et al., Phys. Rev. Lett. 87, 082502 (2001)

[2] Y. Utsuno et al., Phys. Rev. C 70, 044307 (2004)

[3] A.M. Hurst et al., Phys. Lett. B 674, 168-171 (2009)

[4] S. Ettenauer et al., Phys. Rev. C 78, 017302 (2008)