München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 6: Nuclear Astrophysics I

HK 6.4: Talk

Monday, March 18, 2019, 15:15–15:30, HS 16

Measurement of the ³He(α,γ)⁷Be γ-ray angular distribution — •Steffen Turkat¹, Shavkat Akhmadaliev², Daniel Bemmerer², Antonio Caciolli³, Marcel Grieger^1,2, Sebastian Hammer^1,2, Thomas Hensel^1,2, Lisa Hübinger^1,2, Felix Ludwig^1,2, Stefan Reinicke^1,2, Konrad Schmidt¹, Klaus Stöckel^1,2, Tamás Szücs², Louis Wagner^1,2, and Kai Zuber¹ — ¹Institut für Kern- und Teilchenphysik, TU Dresden — ²Helmholtz-Zentrum Dresden-Rossendorf — ³University of Padova, Italy

The improved precision regarding abundance determinations of Big Bang nuclides as well as an increased sensitivity for measuring solar neutrinos call for more precise nuclear data to improve the models. Therefore the ³He(α,γ)⁷Be reaction is being studied at the 3MV Tandetron accelerator at Helmholtz-Zentrum Dresden-Rossendorf, with a focus on the measurement of the γ-ray angular distribution at E ≈ 1 MeV.
This reaction affects the nucleosynthesis of ⁷Li as well as the predicted solar ⁷Be and ⁸B neutrino fluxes. A measurement of the angular distribution of the prompt γ-rays may enable a better comparison between precise experimental data sets at E = 0.7 - 1.3 MeV and a unique data set from the LUNA collaboration at E = 0.09 MeV - 0.13 MeV.
The activated ⁷Be samples are counted at the new Felsenkeller underground facility in Dresden, where a HPGe detector with a relative detection efficiency of 150% was recently installed. The results of the first campaign will be summarized. — Supported by DFG (ZU 123/21-1 and BE 4100/4-1) and the Konrad-Adenauer-Stiftung.