Berlin 2005 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 6: Kern- und Teilchen-Astrophysik

HK 6.1: Gruppenbericht

Freitag, 4. März 2005, 14:00–14:30, TU MA144

LUNA: A Status Report — •Frank Strieder — Institut für Physik mit Ionenstrahlen, Ruhr-Universität Bochum

This talk will give an overview about the experiments in the framework of the LUNA project. In short, the LUNA collaboration (Laboratory Underground for Nuclear Astrophysics) studies at the Gran Sasso underground laboratory, Assergi, Italy, the low energy cross section of capture reactions of astrophysical interest close to the Gamow window. Therefore, a 400 kV high current, electrostatic accelerator was installed in the underground lab and is contiously running in long term experiments. Recently, the measurement of the reaction ¹⁴N(p,γ)¹⁵O was completed. The cross section was measured in the energy range below 400 keV complementary with a N₂ gas target in combination with a 4π BGO summing crystal as well as with a solid target station in combination with a high resolution germanium detector. The different approaches allowed on one side a high efficiency measurement down to very low energies and on the other hand a high resolution experiment, which was able to discriminate clearly all diffenrent contributions to the total cross section. The final results of these measurements will be discussed.

The experimental program of the LUNA collaboration will be continued with the measurement of the reactions ³He(α,γ)⁷Be and ²⁵Mg(p,γ)²⁶Al, which will start in 2005. The experimental status and the prospects of these experiments will be presented.

The projects are supported by Bundesministerium für Bildung und Forschung (05CL1PC1/1).