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| Title: | ACCELERATOR EXPERIMENTS AND THEORETICAL MODELS FOR THE ELECTRON SCREENING EFFECT IN METALLIC ENVIRONMENTS | |
| DOI No: | 10.1142/9789812774354_0014 | |
| Source: | CONDENSED MATTER NUCLEAR SCIENCE (pp 194-209) | |
| Author(s): | A. HUKE
Institüt fur Atomare Physik und Fachdidaktik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany K. CZERSKI Institüt fur Atomare Physik und Fachdidaktik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany P. HEIDE Institüt fur Atomare Physik und Fachdidaktik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany |
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| Abstract: | An overview of our experiments and their results concerning the electron screening effects in metallic environments are presented. 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 serf-implanted target materials. The resulting screening energy values are about one order of magnitude larger compared to gas target experiments and exceed significantly the theoretical predictions. A thorough investigation of the processes in the targets under ion irradiation shows that there are multiparameter 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. For the special situation of deuterium in the metallic environment an improved analysis method has been developed beyond the standard procedures. 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. We also present a numerical model of the electron screening effect in metallic lattices based on an ab initio Hartree–Fock simulation. | |
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