Köln 2004 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 28: Nuclear and Particle Astrophysics I

HK 28.1: Gruppenbericht

Mittwoch, 10. März 2004, 10:45–11:15, F

Nuclear Astrophysics: Progress in Static Burning — •Frank Strieder — Institut für Experimentalphysik III, Ruhr-Universität Bochum, Germany

The Nuclear Astrophysics program at the Ruhr-Universität Bochum consists of three main tasks: ERNA, LUNA, and Electron Screening measurements. This talk will give an overview about the projects and discuss both, status and future prospects of the experiments.

In short, for improved cross section measurements of the reaction ¹²C(α,γ)¹⁶O a recoil separator ERNA (European Recoil Separator for Nuclear Astrophysics) has been developed at the 4 MV Dynamitron tandem accelerator in Bochum to detect directly the ¹⁶O recoils with high efficiency. The LUNA collaboration (Laboratory Underground for Nuclear Astrophysics) studies at the Gran Sasso underground lab the low energy cross section of capture reactions, e.g. ¹⁴N(p,γ)¹⁵O, but also other (α,γ) and (p,γ) reactions in the future. Both experiments demonstrate the power of small accelerator facilities in Nuclear Astrophysics experiments. The experimental studies of the electron screening is another research field. The observed enhancement factors are in many cases significantly larger than could be accounted for from the adiabatic limit. In a series of experiments at the 100 kV accelerator in Bochum this effect has been studied in the reaction d(d,t)p for various deuterated metals. The opportunity of future measurements of the electron screening in other reactions will be presented.

The projects are supported by Deutsche Forschungsgemeinschaft (Ro 429/35-2, Ro 429/39-1) and BMBF (05CL1PC1/1).