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HK: Physik der Hadronen und Kerne

HK 13: Kern- und Teilchen-Astrophysik

HK 13.4: Vortrag

Freitag, 4. März 2005, 17:45–18:00, TU MA144

Deuteron-Induced Reactions on Light Odd-Odd Nuclei at Very Low Energies — •K. Czerski, D. Bemmerer, T. Dorsch, P. Heide, M. Hoeft, A. Huke, and G. Ruprecht — Institut für Atomare Physik und Fachdidaktik, Technische Universität Berlin, Germany

Nuclear reactions induced by deuterons on three self-conjugated nuclei ²H, ⁶Li and ¹⁰B have been investigated both experimentally and theoretically at energies far below the Coulomb barrier. Besides nuclear astrophysics effects such as subthreshold resonances or an enhancement of the cross section due to electron screening, some additional phenomena such as an excitation of giant resonances and the internal isospin mixing could be observed. Furthermore, the investigations performed on ⁶Li and ¹⁰B nuclei solved some long-standing problems concerning branching ratios and experimental angular distributions for different reaction channels. A consistent description of reaction mechanisms was obtained by means of a coherent superposition of compound nucleus resonances and the direct reaction contribution. The reactions ²H(d,p)³H and ²H(d,n)³He were studied on deuterons embedded in different metallic lattices being a unique model for astrophysical strongly coupled plasmas. The electron screening energy in metallic environments was found to be larger by about one order of magnitude compared to a gas target experiment. An improved theoretical approach, based on dielectric function theory, describes the experimental results qualitatively and allows for calculations of nuclear reaction rates down to room temperature.