Bochum 2009 – wissenschaftliches Programm
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HK: Fachverband Hadronen und Kerne
HK 16: Nuclear Structure and Dynamics II
HK 16.8: Eingeladener Gruppenbericht
Montag, 16. März 2009, 18:30–19:00, H-ZO 60
New ideas on the formation of heavy and superheavy neutron rich nuclei — •Valery Zagrebaev1 and Walter Greiner2 — 1FLNR, JINR, Dubna, Russia — 2FIAS, J.W. Goethe-Universität, Frankfurt, Germany
Nowadays, nuclei far from stability are accessible for experimental study in almost any region of the nuclear map. The only exception is the north-east part where a vast blank spot is still unexplored. This area of the nuclear map can be reached neither in fusion–fission reactions nor in fragmentation processes. The unexplored area of heavy neutron-rich nuclides is extremely important for nuclear astrophysics investigations and, in particular, for the understanding of the r-process of astrophysical nucleogenesis. The study of the structural properties of nuclei along the closed neutron shell N = 126 (Z < 80) would also contribute to the present discussion of the quenching of shell effects in neutron rich nuclei.
A novel idea is proposed for the production of these nuclei via low-energy multi-nucleon transfer reactions with stable beams. The estimated yields of neutron-rich nuclei are found to be rather high in such reactions and several tens of new nuclides can be produced, for example, in the near-barrier collision of 136Xe with 208Pb with a cross section higher than one microbarn. This finding may spur new studies at heavy-ion facilities and should have significant impact on future experiments. Fusion reactions with the use of light and medium mass neutron-rich radioactive beams for the production of heavy neutron-rich nuclei will be also discussed in the talk.