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Bochum 2009 – wissenschaftliches Programm

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HK: Fachverband Hadronen und Kerne

HK 59: Nuclear Structure and Dynamics II

HK 59.6: Vortrag

Mittwoch, 18. März 2009, 18:00–18:15, H-ZO 50

Shape coexistence in the neutron-rich isotope 13B with N = 8 studied by lifetime measurements of the excited states — •Hironori Iwasaki1, Alfred Dewald1, Christoph Fransen1, Adrian Gelberg1, Matthias Hackstein1, Jan Jolie1, Pavel Petkov1,2, Thomas Pissulla1, Wolfram Rother1, and Karl-oskar Zell11IKP, Köln, Germany — 2INRNE, Sofia, Bulgaria

The lifetime measurement for the excited states in the neutron-rich nucleus 13B has been performed, at the FN tandem facility in the University of Cologne, by the Doppler-shift attenuation method with the 7Li(7Li,p)13B reaction. Anomalously hindered strength was found for the transition between the second excited states at 3.53 MeV and the ground state. A comparison with the modern shell model calculations suggests the spin and parity (Jπ) of 3/2 for the 3.53-MeV state with the hindered transition strengths to the ground state with Jπ=3/2, providing a consistent picture for the shape coexistence in the neutron-rich isotope 13B with N = 8. Experimental results will be presented and discussed in terms of the shell evolution in the light neutron-rich nuclei around N = 8.

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