Bochum 2018 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 4: Nuclear Astrophysics I

HK 4.5: Vortrag

Montag, 26. Februar 2018, 15:15–15:30, HZO 100

Study of the Big Bang nuclear reactions ²H(p,γ)³He and ³He(α,γ)⁷Be at high energy — •Steffen Turkat¹, Shavkat Akhmadaliev², Daniel Bemmerer², Felix Ludwig^1,2, Klaus Stöckel^1,2, Tamás Szücs^1,2, Louis Wagner^1,2, and Kai Zuber¹ — ¹Institut für Kern- und Teilchenphysik, TU Dresden, Germany — ²Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden, Germany

The improved precision of Big Bang nuclidic abundance determinations calls for more precise nuclear data to improve the models. Currently, the Big Bang abundance predictions for ²H and ⁷Li are limited in precision by the ²H(p,γ)³He and ³He(α,γ)⁷Be reactions, respectively. In order to address this problem, a re-study of these cross sections is underway. Complementing low-energy data from LUNA, these cross sections are being measured in the 0.3-2 MeV center of mass energy range at the HZDR 3 MV Tandetron. The activated ⁷Be samples from the latter reaction shall be counted at the new Felsenkeller underground facility. The status of the two experiments will be summarized. — Supported by DFG (ZU 123/21-1 and BE 4100/4-1).