Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 58: Nuclear Astrophysics II

HK 58.3: Talk

Friday, April 3, 2020, 11:45–12:00, J-HS B

Study of ³He(α,γ)⁷Be at Dresden Felsenkeller — •Konrad Schmidt¹, Steffen Turkat¹, Daniel Bemmerer², and Kai Zuber¹ — ¹TU Dresden, Germany — ²Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Germany

One of the key reactions in both Big-Bang nucleosynthesis (BBN) and p-p-chain hydrogen burning is the ³He(α,γ)⁷Be reaction. The aim of the present study is a comprehensive data set covering the entire BBN range. In a first campaign, γ-ray angular distributions have been measured at the 3 MV Tandetron accelerator of Helmholtz-Zentrum Dresden-Rossendorf (HZDR) with implanted ³He targets. Activated samples of ⁷Be (≈ 53 d half-life) have been counted at the shallow-underground laboratory Dresden Felsenkeller using a new 163% HPGe detector shielded from cosmic rays by ultra-low background copper and lead, active plastic scintillation veto detectors and 140 m water equivalent of rock. A second campaign is planned underground at the new 5 MV Pelletron accelerator Dresden Felsenkeller with a gas target currently under construction that can be operated as an extended gas chamber or as a gas-wall jet. Preliminary results of the angular distribution and activation data from the first campaign will be presented as well as the latest status of the Felsenkeller gas-target setup. This work is supported by DFG (ZU 123/21-1).