Köln 2004 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 14: Poster Session: Heavy Ions

HK 14.1: Poster

Dienstag, 9. März 2004, 13:30–15:30, Foyer

Isospin dependence in the production of heavy-element nucleifrom complete-fusion neutron-evaporation reactions — •Alexander Yakushev¹, Willy Bruechle², Egon Jaeger², Matthias Schaedel², Erwin Schimpf², Andreas Tuerler¹, and Birgit Wierzinski¹ — ¹Institut fuer Radiochemie TU Muenchen — ²Gesellschaft fuer Schwerionenforschung mbH

This work is aimed at investigations on the projectile isospin dependence of heavy element fusion-evaporation residue cross sections at Coulomb barrier energies. For this, it is planned to exploit the potential of radioactive ion-beam facilities like SPIRAL which shall provide n-rich radioactive ion beams. The system Ar on Sm is a well studied heavy-ion reaction. The wide span of Sm nuclides ranging from 144-Sm to 154-Sm provided the basis to study different projectile-target-Z combinations. The goal of this work is to extend these studies to probe the neutron excess in radioactive Ar projectiles - up to 44-Ar - on the evaporation residue cross section at near barrier energies. Hg as the complete-fusion n-evaporation product is chemically well studied, mainly as the lighter homologue of element 112. Highly efficient separation and detection techniques are at hand to identify individual nuclei. This provides us with an important advantage over other techniques; e.g. those which do not measure evaporation residue cross section but indirectly infer fusion cross sections from fission measurements. A first experiment with 36-Ar beam was performed at GSI. The cross sections for 2n-, 3n-, 4n- and 5n-neutron evaporation channels were measured for the complete fusion reaction 36-Ar + 148-Sm.