Speaker
Mr
Klaus Stöckel
(HZDR)
Description
Recent, precise measurements of the primordial 2 H abundance [1] have opened the
possibility to precisely determine of the primordial baryon-to-photon ratio, independent from the cosmic microwave background. For their interpretation, the 2 H abundance data require equally precise nuclear data, in particular on the 2H(p,γ)3He reaction.
Deep underground in the Gran Sasso laboratory, Italy, the LUNA collaboration is undertaking a dedicated effort to measure the 2H(p,γ)3He cross section directly in the Big
Bang energy window of interest. The campaign is divided in two phases based on a
BGO and a high-purity germanium (HPGe) detector, respectively.
The present poster will report on the second, HPGe-based phase of the experiment.
Due to the Doppler shift of the emitted γ-rays, in addition to the absolute yield also in-
formation on the γ -ray angular distribution, thus reducing the systematic uncertainty.
The characterization and calibration of the setup and detectors, background conditions, and potential sources of uncertainty will be discussed.
References
[1] R. J. Cooke, M. Pettini, R. A. Jorgenson, M. T. Murphy, and C. C. Steidel, Astrophys. J.
781, 31 (2014).
Primary author
Mr
Klaus Stöckel
(HZDR)
