Bonn 2020 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 58: Nuclear Astrophysics II

HK 58.2: Vortrag

Freitag, 3. April 2020, 11:30–11:45, J-HS B

Study of the 2H(p)3He reaction at LUNAKlaus Stöckel1,2, •Daniel Bemmerer1, and Tamás Szücs1 for the LUNA collaboration — 1Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden — 2Technische Universität Dresden

Highly precise measurements of the primordial 2H abundance in damped Lyman-α systems have rekindled hope to decisively improve the precision of Big Bang nucleosynthesis (BBN) constraints on the primordial baryon to photon ratio. However, the interpretation of the 2H abundance data is limited by the imprecise knowledge on 2H destruction by the 2H(p,γ)3He reaction.

The present contribution will report on the recently completed measurement of the 2H(p,γ)3He cross section using a windowless gas target and a high-purity germanium detector in close geometry at the LUNA 400 kV accelerator, deep underground in the Gran Sasso laboratory, Italy. The new data are directly in the energy range of Big Bang nucleosynthesis and present an important step towards improving the precision of cosmological constraints from BBN.

Supported by DFG (BE 4100/4-1).

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