Berlin 2005 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 13: Kern- und Teilchen-Astrophysik

HK 13.5: Vortrag

Freitag, 4. März 2005, 18:00–18:15, TU MA144

Enhanced Screening of the d+d Fusion Reactions in Metallic Environments — Experimental Results and Numerical Simulations — •Armin Huke, Konrad Czerski, and Peter Heide — Institut für Atomare Physik und Fachdidaktik, Technische Universität Berlin, Berlin, Germany

The measurements of the reactions ²H(d,p)³H and ²H(d,n)³He were performed with an electrostatic accelerator at incident deuteron energies between 5 and 60 keV at different self-implanted target materials. The resulting screening energy values are about one order of magnitude larger compared to a gas target experiment and exceed significantly the theoretical predictions. A thorough investigation of the processes in the targets under deuteron ion irradiation shows that there are multi-parameter collateral effects which are crucial for the correct interpretation of the observed enhancements. They mainly originate from target surface contaminations due to residual gases in the vacuum as well as from inhomogeneities in the deuteron density distribution in heterogeneous targets. Experimental evidence for the influence of such effects and a mathematical model for their assessment are given and compared with the results of other groups. A numerical model of the electron screening effect in metallic lattices based on an ab-initio Hartree-Fock simulation is presented.